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WO2015032126A1 - Electric tool control circuit - Google Patents

Electric tool control circuit Download PDF

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Publication number
WO2015032126A1
WO2015032126A1 PCT/CN2013/086525 CN2013086525W WO2015032126A1 WO 2015032126 A1 WO2015032126 A1 WO 2015032126A1 CN 2013086525 W CN2013086525 W CN 2013086525W WO 2015032126 A1 WO2015032126 A1 WO 2015032126A1
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WO
WIPO (PCT)
Prior art keywords
resistor
circuit
capacitor
main control
transistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/086525
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French (fr)
Chinese (zh)
Inventor
肖阳作
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou Blueway Electronic Co Ltd
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Huizhou Blueway Electronic Co Ltd
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Filing date
Publication date
Application filed by Huizhou Blueway Electronic Co Ltd filed Critical Huizhou Blueway Electronic Co Ltd
Publication of WO2015032126A1 publication Critical patent/WO2015032126A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P31/00—Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00

Definitions

  • the utility model relates to a control circuit, in particular to a control circuit of a power tool.
  • the technical problem to be solved by the present invention is to provide a control circuit for a power tool.
  • control circuit of the power tool of the present invention is connected between the lithium battery pack and the brushless DC motor, including
  • the main control chip is used for controlling the coordination work of each circuit; and is characterized in that:
  • a power supply circuit for providing a suitable power supply to each circuit, connected between the lithium battery pack and each related circuit;
  • the three-phase driving circuit receives the control signal outputted by the main control chip, drives or stops the working of the motor, and is connected between the main control chip and the brushless DC motor;
  • the signal detection input circuit is configured to detect the speed control input signal, detect the battery pack temperature signal, detect the battery pack voltage signal, detect the forward/reverse input signal, and connect with the main control chip;
  • the Hall detecting circuit provides a working power supply for the motor Hall device and a connection input of the Hall signal, and is connected between the main control chip and the brushless DC motor;
  • the current detecting circuit detects the working current of the motor, and the signal collecting end is connected to the three-phase driving circuit, and the signal output end is connected to the main control chip.
  • the signal detection input circuit comprises
  • the pull-up resistor R38 and the switch S2 are used for detecting the forward/reverse rotation of the brushless DC motor, and the port 2 of the switch S2 is connected to the pin corresponding to the main control chip through the pull-up resistor R38, and the port 1 and the switch of the switch S2 are switched.
  • the pin corresponding to the control chip is connected, and the port 3 of the switch S2 is connected to the pin corresponding to the main control chip;
  • Resistor R7, resistor R16 and capacitor C9 are used to detect the voltage of the battery pack.
  • the resistor R7 and the resistor R16 are connected in series to form a voltage divider network, and then the external switch S1 and the ground terminal are connected.
  • the capacitor C9 is connected in parallel across the resistor R16, and between the resistor R7 and the resistor R16.
  • the node is a detection voltage output port, and is connected to a pin corresponding to the main control chip;
  • Resistor R27, thermistor NTC1, resistor R33 and capacitor C16 are used to detect the battery pack temperature.
  • the resistor R27 is connected in series with the thermistor NTC1.
  • the resistor R33 and the capacitor C16 are connected in series and connected in parallel with the thermistor NTC1.
  • the resistor R33 and the capacitor C16 are connected.
  • the node between the nodes is an output port for detecting temperature, and is connected to a pin corresponding to the main control chip;
  • the adjustable resistor S1VR, the resistor R18 and the capacitor C11 are used for speed control.
  • the resistor R18 and the capacitor C11 are connected in series and then connected in parallel between the adjustable end of the adjustable resistor S1VR and the ground.
  • the node between the resistor R18 and the capacitor C11 is The output port of the speed control signal is connected to the pin corresponding to the main control chip.
  • the power circuit includes
  • the power switch S1 controls the energization of the entire circuit, provides the total voltage BAT+, and directly supplies power to the three-phase driving circuit;
  • Resistor R2, capacitor C8, diode D4, resistor R1, capacitor C6, Zener diode Z1 and capacitor C7 are used to supply voltage VCC to the main control chip.
  • Resistor R2 is connected in series with capacitor C8.
  • resistor R1 and capacitor C6 are connected in series.
  • the Zener diode Z1 and the capacitor C7 are connected in parallel and connected in parallel with C6.
  • the node between the resistor R1 and the capacitor C6 is an output port of the voltage VCC, and is connected to the pin corresponding to the main control chip;
  • Resistor R3, resistor R14, MOS transistor Q1, Zener diode Z2, resistor R22, capacitor C13, transistor Q3, resistor R15, resistor R23, resistor R35 and transistor Q2 are used to supply voltage VLED to the illumination indicating circuit and the power display circuit.
  • the resistor R15 is connected in series with the resistor R23, and the collector and the emitter of the transistor Q2 are connected in parallel with the resistor R23.
  • the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected with a resistor R35, and the node between the resistor R15 and the resistor R23 is connected.
  • the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the node between the resistor R14 and the capacitor C23 through the resistor R22, the other end of the resistor R14 and the gate of the MOS transistor Q1, the Zener tube
  • the anode of Z2 is connected, the cathode of the Zener Z2 is connected to the source of the MOS transistor Q1, the resistor Z3 is connected in parallel with the resistor R3, and the drain of the MOS transistor Q1 is the output port of the voltage VLED;
  • Resistor R37, capacitor C21, resistor R39, transistor Q4, reference voltage chip U1, capacitor C20, resistor R40, resistor R45 and capacitor C22 are used to supply voltage 2V4 to the signal detection input circuit, resistor R37 and capacitor C21 in series, resistor R37 and
  • the node between the capacitor C21 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the cathode of the reference voltage chip U1, the reference pole of the reference voltage chip U1 is connected to the node between the resistors R40 and R45, and the other end of the resistor R40 Connected to the emitter of the transistor Q4, the collector of the transistor Q4 has a resistor R39 in parallel with the base, and a capacitor C20 is connected in parallel across the resistor R45.
  • One end of the capacitor C22 is connected to the emitter of the transistor Q4, and the other end is grounded, and the emitter of the transistor Q4 is extremely Output port of voltage 2V4.
  • the Hall detecting circuit comprises a resistor R46 connected to a corresponding pin of the sensor, a resistor R47 and a resistor R48, and a diode D9, a diode D10 and a diode D11 respectively connected in series with the resistors; the diode D9 and the diode D10. It is connected to the cathode of the diode D11 and is connected to the corresponding pin of the main control chip.
  • the three-phase driving circuit can be divided into U, V, W three-phase driving circuits with the same structure, wherein the U-phase circuit comprises a diode D1, a capacitor C3, a resistor R19, a diode D5, which constitute a U-phase bootstrap circuit, and Connected in series with each other and connected to the MOS transistor QUH1 and the MOS transistor QYL1 between the voltage BAT+ and the ground; the source of the MOS transistor QUH1 is connected to the drain of the MOS transistor QYL1, and the node between the MOS transistor QUH1 and the MOS transistor QYL1 The U-phase bootstrap circuit is connected, and the gate of the MOS transistor QUH1 and the gate of the MOS transistor QYL1 are respectively connected to the corresponding pins of the main control chip through the resistor R4 and the resistor R24.
  • the node output U-phase signal between the MOS transistor QUH1 and the MOS transistor QYL1 drives the brushless DC motor.
  • the current detecting circuit comprises a resistor R36, a resistor R55, a resistor R56 and a capacitor C32; the resistor R36 is respectively connected to the resistor R55 and the resistor R56, and the other end of the resistor R55 and the resistor R56 is connected to the pin corresponding to the main control chip.
  • a filter capacitor C32 is connected between the resistor R55 and the resistor R56.
  • it also includes
  • Illumination indicating circuit used for lighting when starting up, ensuring that each booting is not lower than the preset lighting time, and also used for warning indication when an abnormality occurs in the entire circuit system, and is connected to the main control chip;
  • the power indicator circuit is used to display the power when the power is turned on.
  • the maximum length of each power-on is not greater than the preset power display time.
  • the illumination indicating circuit comprises a resistor R28 and a light emitting diode LED4, the resistor R28 is connected to the anode of the light emitting diode LED4, and the cathode of the light emitting diode LED4 is grounded.
  • the electric quantity indicating circuit comprises a light emitting diode LED1, a light emitting diode LED2, a light emitting diode LED3, a triode Q5, a triode Q6 and a triode Q7 connected in series between the cathode of each light emitting diode and the ground; the base of each triode It is connected to the corresponding pin of the main control chip through the resistor R34, the resistor R17 and the resistor R29.
  • each signal detection circuit module can effectively improve the safety and stability of the operation of the power tool; 2. Replace the brushed DC motor with a brushless DC motor. There is no spark generated by mechanical commutation to reduce noise.
  • FIG. 1 is a block diagram of a control circuit of a power tool according to the present invention.
  • FIG. 2 is a connection circuit diagram of four modules of a power supply circuit, a lighting indication, a power display, and a signal detection input circuit according to the present invention.
  • FIG. 3 is a circuit diagram of a main control chip and a peripheral related circuit thereof according to the implementation of the present invention.
  • FIG. 4 is a circuit diagram of a three-phase driving circuit implemented in the present invention.
  • a control circuit of a power tool includes a power supply circuit 5, an illumination indicating circuit 1, a power indicating circuit 2, a signal detecting input circuit 3, and a main control chip 4, Hall detecting circuit 6, three-phase driving circuit 7, and current detecting circuit 8.
  • the main control chip 4 is used for controlling the coordination work of each circuit
  • the power circuit 5 is configured to provide a suitable power source to each circuit, and is connected between the lithium battery pack and each related circuit;
  • the three-phase driving circuit 7 receives the control signal outputted by the main control chip 4, drives or stops the motor operation, and is connected between the main control chip 4 and the brushless DC motor;
  • the signal detection input circuit 3 is configured to detect the speed regulation input signal, detect the battery pack temperature signal, detect the battery pack voltage signal, detect the forward/reverse input signal, and connect with the main control chip 4;
  • the Hall detecting circuit 6 provides a working power supply for the motor Hall device and a connection input of the Hall signal, and is connected between the main control chip 4 and the brushless DC motor;
  • the current detecting circuit 8 detects the working current of the motor, the signal collecting end is connected to the three-phase driving circuit 7, and the signal output end is connected to the main control chip 4;
  • the illumination indicating circuit 1 is used for lighting when the power is turned on, ensuring that the power-on time is not lower than the preset lighting time, and is also used for warning indication when an abnormality occurs in the entire circuit system, and is connected to the main control chip 4;
  • the power indicating circuit 2 is configured to display the power when the power is turned on, and the maximum length of each power-on is not greater than the preset power display time, and the system is automatically turned off when the power is turned off, and is connected to the main control chip 4.
  • the signal detection input circuit 3 includes
  • the pull-up resistor R38 and the switch S2 are used for detecting the forward/reverse rotation of the brushless DC motor, and the port 2 of the switch S2 is connected to the pin corresponding to the main control chip 4 through the pull-up resistor R38, and the port 1 of the switch S2 is switched
  • the pin corresponding to the main control chip 4 is connected, and the port 3 of the switch S2 is connected to the pin corresponding to the main control chip 4;
  • Resistor R7, resistor R16 and capacitor C9 are used to detect the voltage of the battery pack.
  • the resistor R7 and the resistor R16 are connected in series to form a voltage divider network, and then the external switch S1 and the ground terminal are connected.
  • the capacitor C9 is connected in parallel across the resistor R16, and between the resistor R7 and the resistor R16.
  • the node is a detection voltage output port, and is connected to a pin corresponding to the main control chip 4;
  • Resistor R27, thermistor NTC1, resistor R33 and capacitor C16 are used to detect the battery pack temperature.
  • the resistor R27 is connected in series with the thermistor NTC1.
  • the resistor R33 and the capacitor C16 are connected in series and connected in parallel with the thermistor NTC1.
  • the resistor R33 and the capacitor C16 are connected.
  • the node between the nodes is an output port for detecting temperature, and is connected to a pin corresponding to the main control chip 4;
  • the adjustable resistor S1VR, the resistor R18 and the capacitor C11 are used for speed control.
  • the resistor R18 and the capacitor C11 are connected in series and then connected in parallel between the adjustable end of the adjustable resistor S1VR and the ground.
  • the node between the resistor R18 and the capacitor C11 is The output port of the speed control signal is connected to the pin corresponding to the main control chip 4.
  • the power circuit 5 includes
  • the power switch S1 controls the energization of the entire circuit, provides the total voltage BAT+, and directly supplies power to the three-phase driving circuit 7;
  • Resistor R2, capacitor C8, diode D4, resistor R1, capacitor C6, Zener diode Z1 and capacitor C7 are used to supply voltage VCC to main control chip 4, resistor R2 is connected in series with capacitor C8, diode D4, resistor R1 and capacitor C6 are connected in series. After being connected in parallel with the capacitor C8, the Zener diode Z1 and the capacitor C7 are connected in parallel and connected in parallel with C6.
  • the node between the resistor R1 and the capacitor C6 is an output port of the voltage VCC, and is connected to the pin corresponding to the main control chip 4;
  • the resistor R15 is connected in series with the resistor R23.
  • the collector and the emitter of the transistor Q2 are connected in parallel with the resistor R23.
  • the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected with a resistor R35, and between the resistor R15 and the resistor R23.
  • the node is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the node between the resistor R14 and the capacitor C23 through the resistor R22, and the other end of the resistor R14 is connected to the gate of the MOS transistor Q1.
  • the anode of the pressure tube Z2 is connected, the cathode of the Zener tube Z2 is connected to the source of the MOS tube Q1, the resistor Z3 is connected in parallel with the resistor R3, and the drain of the MOS tube Q1 is the output port of the voltage VLED;
  • Resistor R37, capacitor C21, resistor R39, transistor Q4, reference voltage chip U1, capacitor C20, resistor R40, resistor R45 and capacitor C22 are used to supply voltage 2V4 to signal detection input circuit 3, resistor R37 and capacitor C21 in series, resistor R37
  • the node between the capacitor C21 and the collector of the transistor Q4 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the cathode of the reference voltage chip U1, the reference pole of the reference voltage chip U1 is connected to the node between the resistors R40 and R45, and the resistor R40 is another.
  • the illumination indicating circuit 1 includes a resistor R28 and a light emitting diode LED4.
  • the resistor R28 is connected to the anode of the light emitting diode LED4, and the cathode of the light emitting diode LED4 is grounded.
  • the power indicating circuit 2 includes a light emitting diode LED1, a light emitting diode LED2, a light emitting diode LED3, a transistor Q5, a transistor Q6, and a transistor Q7 connected in series between the cathode of each light emitting diode and the ground; the base of each of the transistors passes through a resistor R34, The resistor R17 and the resistor R29 are connected to the corresponding pins of the master chip 4.
  • the Hall detecting circuit 6 includes a resistor R46, a resistor R47 and a resistor R48 connected to the corresponding pin of the sensor, and a diode D9, a diode D10 and a diode D11 connected in series with the resistors respectively; the diode D9, the diode D10 and the diode D11 The cathodes are connected and connected to the corresponding pins of the main control chip 4.
  • the three-phase driving circuit 7 can be divided into U, V, W three-phase driving circuits with the same structure, wherein the U-phase circuit includes a diode D1, a capacitor C3, a resistor R19, a diode D5, which form a U-phase bootstrap circuit, and are connected in series and connected to each other.
  • the MOS transistor QUH1 and the MOS transistor QYL1 between the voltage BAT+ and the ground; the source of the MOS transistor QUH1 is connected to the drain of the MOS transistor QYL1, and the node between the MOS transistor QUH1 and the MOS transistor QYL1 is bootstrapped with the U phase.
  • the circuit is connected, the gate of the MOS transistor QUH1 and the gate of the MOS transistor QYL1 are respectively connected to the corresponding pins of the main control chip 4 through the resistor R4 and the resistor R24.
  • the node output U-phase signal between the MOS transistor QUH1 and the MOS transistor QYL1 drives the brushless DC motor.
  • the current detecting circuit 8 includes a resistor R36, a resistor R55, a resistor R56 and a capacitor C32.
  • the resistor R36 is respectively connected to the resistor R55 and the resistor R56, and the other end of the resistor R55 and the resistor R56 is connected to a pin corresponding to the main control chip, and the resistor R55 and A filter capacitor C32 is connected between the resistors R56.
  • the power supply voltage BAT+ is first obtained; the resistor R2 and the capacitor C8 form an RC filter, and the Zener diode D1 limits the amplitude of the output voltage VCC through the limiting resistor R1, the filter capacitor C6, and the capacitor.
  • the tube Q1 is turned on to obtain the voltage VLED; the voltage VCC branch is filtered through the resistor R37 and the capacitor C21.
  • Resistor R39 provides the bias of transistor Q4, resistor R40, and resistor R45 form a feedback network to provide reference voltage chip U1 to keep the base of the transistor stable, thus maintaining a constant voltage of 2V4 output.
  • Capacitor C20 filters out unwanted clutter, and capacitor C22 filters out ripple.
  • the resistor R35 and the transistor Q2 control the voltage VLED of the illumination indicating circuit and the power indicating circuit, and are controlled by the PW_CTR signal outputted by the pin corresponding to the main control chip.
  • the transistor Q2 When the output is high level, the transistor Q2 is turned on, the transistor Q3 is turned off, and the MOS transistor Q1 is turned off.
  • the delay is cut off, and the delay time is determined by the RC time constant composed of the resistor R3, the resistor R14, and the capacitor C13, and the delay time is greater than or equal to a preset value.
  • the voltage VLED is limited to drive the LED 4 through the resistor R28, and the LED 4 provides illumination. If any kind of alarm signal occurs, the LED LED4 flashes to indicate that it is in an abnormal working state.
  • Resistor R8, resistor R34, LED LED1, and transistor Q5 form the LED1 drive circuit.
  • the pin output LED1 signal corresponding to the main control chip controls the on/off of the triode Q5 via the resistor R34, and can control the LED of the LED1, and the resistor R8 acts as a current limiting device; the resistor R9, the resistor R17, the LED 2, and the transistor Q6 LED2 drive circuit.
  • the pin output LED2 signal corresponding to the main control chip controls the on/off of the triode Q6 via the resistor R17, and can control the LED of the LED 2, and the resistor R9 acts as a current limiting device; the resistor R10, the resistor R29, the LED 3, and the transistor Q7 Light-emitting diode LED3 drives the circuit.
  • the pin output LED3 signal corresponding to the main control chip controls the on/off of the triode Q75 via the resistor R29, and can control the LED3 to be turned off, and the resistor R10 acts as a current limiting function.
  • the light emitting diode LED1, the light emitting diode LED2, and the light emitting diode LED3 are used for power display.
  • the longest display time is about 6S, and when the switch S1 is turned off, the power indicator light is automatically turned off.
  • the resistor R7 and the resistor R16 form a voltage dividing network, and are input to the main control chip for AD conversion through the filter capacitor C9 to obtain the real-time voltage of the battery pack.
  • the main control chip has an AD reference source of 2.4V; the resistor R27 and the thermistor NTC1 form a voltage division network, and the filter capacitor C16 is input to the main control chip for AD conversion through the resistor R33, and the real-time temperature of the battery pack is obtained;
  • the resistor S1VR slides up and down, and the center tap obtains a voltage dividing ratio.
  • the filter capacitor C11 is input to the main control chip for AD conversion, and the speed reference value is obtained;
  • the switch S2 is dialed to the port CW, the pull-up resistor R18 is such that the port CW assumes a high level 1, the switch S2 is dialed to the port CCW, and the pull-up resistor R18 causes the CCW to assume a high level 1.
  • the current of the three-phase driving circuit 7 flows through the resistor R36, and is input to the main control chip via the resistor R55, the resistor R56, and the filter capacitor C32.
  • the bits AD conversion process obtains the real-time current value.
  • the Hall sensor signal inside the brushless DC motor is input to the main control chip through the resistor R46, the resistor R47, and the resistor R48 for rotor position determination processing.
  • Diode D9, diode D10, and diode D11 act as level clamps.
  • the main control chip is a single-supply integrated motor pre-driver controller with 6-channel PWM high-side pre-driver and low-side pre-driver with built-in charge pump conversion circuit. Combined with an external three-phase drive circuit to control the brushless DC motor.
  • Capacitor C26 capacitor C27 is used for main control chip core power supply filtering; capacitor C25 is used for main control chip internal power supply V3P3D filtering; capacitor C23, capacitor C24 is used for main control chip internal power supply V7A filtering; resistor R52, capacitor C28, capacitor C29 Filter the internal power supply V7P and V7PDRV of the main control chip.
  • Capacitor C30 is the internal power supply V3P3A filter of the main control chip.
  • Diode D1, capacitor C3, resistor R19, and diode D5 form a U-phase bootstrap circuit.
  • the U-phase MOS transistor QTL1 When the U-phase MOS transistor QTL1 is in the conduction phase, the power supply The V7P voltage charges C3 through diode D1, capacitor C3, resistor R19, and U-phase MOS transistor QTL1.
  • MOS tube QOL1 When MOS tube QOL1 is turned off, QUH1 is turned on, the voltage at the lower end of capacitor C3 rises to BAT+, and the voltage at the upper end of capacitor C3 rises to V7P. + BAT+, this bootstrap voltage is input to the main control chip via the port UBOOT, processed by the internal circuit, and output to the port UHSD to drive the high-end MOS transistor QUH1.
  • the resistor R11 is a GS (gate source) pull-down resistor of the MOS transistor QUH1, and the Zener diode Z3 limits the GS voltage of the MOS transistor QUH1.
  • the resistor R24, the resistor R30, the Zener diode Z6, and the MOS transistor QYL1 form a U-phase low-end drive.
  • the resistor R30 is the GS pull-down resistor of the MOS transistor QYL1, and the Zener diode Z6 limits the GS voltage of the MOS transistor QYL1.
  • Diode D2, capacitor C4, resistor R20, and diode D6 form a V-phase bootstrap circuit.
  • the V-phase MOS transistor QVL1 When the V-phase MOS transistor QVL1 is in the conduction phase, the power supply V7P voltage is charged to the C4 via the diode D2, the capacitor C4, the resistor R20, and the V-phase MOS transistor QVL1.
  • the MOS transistor QVL1 is turned off and the QVH1 is turned on, the voltage at the lower end of the capacitor C4 rises to BAT+, and the voltage at the upper end of the capacitor C4 rises to V7P.
  • this bootstrap voltage is input to the main control chip through the port VBOOT, processed by the internal circuit, and output to the port VHSD to drive the high-end MOS transistor QVH1.
  • the resistor R12 is a GS (gate source) pull-down resistor of the MOS transistor QVH1, and the Zener diode Z4 limits the GS voltage of the MOS transistor QVH1.
  • Resistor R25, resistor R31, Zener diode Z7, MOS transistor QVL1 form the V-phase low-end drive.
  • the resistor R31 is the GS pull-down resistor of the MOS transistor QVL1, and the Zener diode Z7 limits the GS voltage of the MOS transistor QVL1.
  • Diode D3, capacitor C5, resistor R21, and diode D7 form a W-phase bootstrap circuit.
  • the W-phase MOS transistor QWL1 When the W-phase MOS transistor QWL1 is in the conducting phase, the power supply V7P voltage is charged to the C5 via the diode D3, the capacitor C5, the resistor R21, and the W-phase MOS transistor QWL1.
  • the MOS transistor QWL1 When the MOS transistor QWL1 is turned off and the QWH1 is turned on, the voltage at the lower end of the capacitor C5 rises to BAT+, and the voltage at the upper end of the capacitor C5 rises to V7P. + BAT+, this bootstrap voltage is input to the main control chip via WBOOT, processed by internal circuit, and output to port WHSD to drive high-end MOS transistor QWH1.
  • the resistor R13 is a GS (gate source) pull-down resistor of the MOS transistor QWH1, and the Zener diode Z5 limits the GS voltage of the MOS transistor QWH1.
  • Resistor R26, resistor R32, Zener diode Z8, MOS transistor QWL1 form the W phase low-end drive.
  • the resistor R32 is the GS pull-down resistor of the MOS transistor QWL1, and the Zener diode Z8 limits the GS voltage of the MOS transistor QWL1.
  • the master chip controls the output of the three-phase drive circuit based on the detected information.
  • the specific process is as follows:
  • the Hall detection signal is analyzed and processed by the main control chip, and the Hall signal is not abnormal. Then the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase driving circuit to drive the brushless DC motor. In the event of a disconnection or short circuit, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.
  • Speed control signal SV through the internal control chip 10 bits AD conversion, obtain the reference speed, the main control chip outputs the corresponding duty cycle U/V/W three-phase PWM signal to the three-phase drive circuit to drive the brushless DC motor.
  • the voltage detection signal BAT_AD is 10 bits inside the main control chip. AD conversion, obtain the real-time voltage of the lithium battery pack. If the voltage is between +15V and 24V, the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase drive circuit to drive the brushless DC. The motor works. Otherwise, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.
  • Temperature detection signal BAT_NTC via the internal control chip 10 bits AD conversion, obtain the real-time temperature of the lithium battery pack. If the temperature is between 0°C and 45°C, the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase drive circuit to drive the brushless DC motor works. Otherwise, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.
  • the positive/reverse detection signal CW/CCW is read by the main control chip, and the main control chip outputs the U/V/W three-phase PWM signal of the corresponding duty ratio to the three-phase driving circuit according to the following table.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

An electric tool control circuit, comprising a lithium battery pack, a brushless direct current motor, a power circuit (5), a signal detection input circuit (3), a main control chip (4), a Hall detection circuit (6), a three-phrase driving circuit (7), and a current detection circuit (8); the power circuit is connected to the lithium battery pack and a relevant circuit module; the signal detection circuit is connected to the main control chip; and the three-phrase driving circuit and the Hall detection circuit are connected between the main control chip and the brushless direct current motor. The control circuit improves security and stability of the operation of an electric tool.

Description

一种电动工具的控制电路Control circuit for electric tool 技术领域  Technical field

本实用新型涉及一种控制电路，具体地说是一种电动工具的控制电路。  The utility model relates to a control circuit, in particular to a control circuit of a power tool.

背景技术  Background technique

目前电动工具已广泛应用于建筑、装潢、机械、电力、桥梁、园艺等领域，并大量进入家庭。但由于一般电动工具通常采用交流、铅酸电池或镍氢电池供电，或是采用有刷直流电机，存在结构较笨重、使用不便、噪音大易影响临近设备、机械换向产生火花、能量损耗较大、动态特性不好等或多或少的不良缺点。为了克服上述不良因素，达到轻巧便携、使用方便、减少干扰噪音、增强工具动态特性的目的，采用锂电池组做动力的无刷直流电动工具方案基本能满足这些要求。 At present, power tools have been widely used in construction, decoration, machinery, electric power, bridges, gardening, etc., and have entered the family in large numbers. However, since general power tools are usually powered by AC, lead-acid batteries or nickel-metal hydride batteries, or brushed DC motors, there are cumbersome structures, inconvenient use, high noise, easy to affect adjacent equipment, mechanical commutation, sparks, and energy loss. Big or bad dynamic characteristics, etc. More or less bad shortcomings. In order to overcome the above-mentioned undesirable factors and achieve the purpose of being light and portable, convenient to use, reducing interference noise, and enhancing the dynamic characteristics of the tool, the brushless DC power tool scheme using the lithium battery pack as the power can basically meet these requirements.

发明内容  Summary of the invention

针对上述现有技术，本实用新型要解决的技术问题是提供一种电动工具的控制电路。 In view of the above prior art, the technical problem to be solved by the present invention is to provide a control circuit for a power tool.

为了解决上述问题，本实用新型的电动工具的控制电路，连接于锂电池组与无刷直流电机之间，包括 In order to solve the above problem, the control circuit of the power tool of the present invention is connected between the lithium battery pack and the brushless DC motor, including

主控芯片，用于控制各电路协调工作；其特征在于：还包括， The main control chip is used for controlling the coordination work of each circuit; and is characterized in that:

电源电路，用于向各电路提供合适的电源，连接于锂电池组与各相关电路之间； a power supply circuit for providing a suitable power supply to each circuit, connected between the lithium battery pack and each related circuit;

三相驱动电路，接收主控芯片输出的控制信号，驱动或停止电机工作，连接于主控芯片与无刷直流电机之间； The three-phase driving circuit receives the control signal outputted by the main control chip, drives or stops the working of the motor, and is connected between the main control chip and the brushless DC motor;

信号检测输入电路，用于检测调速输入信号、检测电池组温度信号、检测电池组电压信号、检测正转/反转输入信号，与主控芯片相连； The signal detection input circuit is configured to detect the speed control input signal, detect the battery pack temperature signal, detect the battery pack voltage signal, detect the forward/reverse input signal, and connect with the main control chip;

霍尔检测电路，提供用于电机霍尔器件的工作电源，及霍尔信号的连接输入，连接于主控芯片与无刷直流电机之间； The Hall detecting circuit provides a working power supply for the motor Hall device and a connection input of the Hall signal, and is connected between the main control chip and the brushless DC motor;

电流检测电路，检测电机的工作电流，其信号采集端连接三相驱动电路，其信号输出端连接主控芯片。 The current detecting circuit detects the working current of the motor, and the signal collecting end is connected to the three-phase driving circuit, and the signal output end is connected to the main control chip.

优选的，所述信号检测输入电路包括 Preferably, the signal detection input circuit comprises

上拉电阻R38和切换开关S2，用于检测无刷直流电机正/反转，切换开关S2的端口2通过上拉电阻R38与主控芯片对应的管脚连接，切换开关S2的端口1与主控芯片对应的管脚连接，切换开关S2的端口3与主控芯片对应的管脚连接； The pull-up resistor R38 and the switch S2 are used for detecting the forward/reverse rotation of the brushless DC motor, and the port 2 of the switch S2 is connected to the pin corresponding to the main control chip through the pull-up resistor R38, and the port 1 and the switch of the switch S2 are switched. The pin corresponding to the control chip is connected, and the port 3 of the switch S2 is connected to the pin corresponding to the main control chip;

电阻R7、电阻R16和电容C9，用于检测电池组电压，电阻R7与电阻R16串联组成分压网络后外接开关S1与地端，电容C9并联于电阻R16两端，电阻R7与电阻R16之间的节点为检测电压输出端口，与主控芯片对应的管脚连接； Resistor R7, resistor R16 and capacitor C9 are used to detect the voltage of the battery pack. The resistor R7 and the resistor R16 are connected in series to form a voltage divider network, and then the external switch S1 and the ground terminal are connected. The capacitor C9 is connected in parallel across the resistor R16, and between the resistor R7 and the resistor R16. The node is a detection voltage output port, and is connected to a pin corresponding to the main control chip;

电阻R27、热敏电阻NTC1、电阻R33和电容C16，用于检测电池组温度，电阻R27与热敏电阻NTC1串联，电阻R33和电容C16串联后与热敏电阻NTC1并联，电阻R33和电容C16之间的节点为检测温度的输出端口，与主控芯片对应的管脚连接； Resistor R27, thermistor NTC1, resistor R33 and capacitor C16 are used to detect the battery pack temperature. The resistor R27 is connected in series with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected in series and connected in parallel with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected. The node between the nodes is an output port for detecting temperature, and is connected to a pin corresponding to the main control chip;

可调电阻S1VR、电阻R18和电容C11，用于调速控制，电阻R18和电容C11串联后并联于可调电阻S1VR的可调端与地端之间，电阻R18和电容C11之间的节点为调速控制信号的输出端口，与主控芯片对应的管脚连接。 The adjustable resistor S1VR, the resistor R18 and the capacitor C11 are used for speed control. The resistor R18 and the capacitor C11 are connected in series and then connected in parallel between the adjustable end of the adjustable resistor S1VR and the ground. The node between the resistor R18 and the capacitor C11 is The output port of the speed control signal is connected to the pin corresponding to the main control chip.

优选的，所述电源电路包括 Preferably, the power circuit includes

电源开关S1，控制整个电路的通电，提供总电压BAT+，并直接给三相驱动电路供电； The power switch S1 controls the energization of the entire circuit, provides the total voltage BAT+, and directly supplies power to the three-phase driving circuit;

电阻R2、电容C8、二极管D4、电阻R1、电容C6、稳压二极管Z1和电容C7，用于提供电压VCC到主控芯片，电阻R2与电容C8串联，二极管D4、电阻R1和电容C6串联后与电容C8并联，稳压二极管Z1和电容C7并联后与C6并联，电阻R1和电容C6之间的节点为电压VCC的输出端口，与主控芯片对应的管脚连接； Resistor R2, capacitor C8, diode D4, resistor R1, capacitor C6, Zener diode Z1 and capacitor C7 are used to supply voltage VCC to the main control chip. Resistor R2 is connected in series with capacitor C8. After diode D4, resistor R1 and capacitor C6 are connected in series. In parallel with the capacitor C8, the Zener diode Z1 and the capacitor C7 are connected in parallel and connected in parallel with C6. The node between the resistor R1 and the capacitor C6 is an output port of the voltage VCC, and is connected to the pin corresponding to the main control chip;

电阻R3、电阻R14、MOS管Q1、稳压管Z2、电阻R22、电容C13、三极管Q3、电阻R15、电阻R23、电阻R35和三极管Q2，用于提供电压VLED到照明指示电路和电量显示电路，电阻R15与电阻R23串联，三极管Q2的集电极与发射极并联在电阻R23上，其中，三极管Q2的发射极接地，三极管Q2的基极连接有电阻R35，电阻R15与电阻R23之间的节点接入三极管Q3的基极，三极管Q3的发射极接地，三极管Q3的集电极通过电阻R22连接到电阻R14与电容C23之间的节点，电阻R14的另一端与MOS管Q1的栅极、稳压管Z2的阳极相连，稳压管Z2的阴极连接MOS管Q1的源极，稳压管Z2的两端并联有电阻R3，MOS管Q1的漏极为电压VLED的输出端口； Resistor R3, resistor R14, MOS transistor Q1, Zener diode Z2, resistor R22, capacitor C13, transistor Q3, resistor R15, resistor R23, resistor R35 and transistor Q2 are used to supply voltage VLED to the illumination indicating circuit and the power display circuit. The resistor R15 is connected in series with the resistor R23, and the collector and the emitter of the transistor Q2 are connected in parallel with the resistor R23. The emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected with a resistor R35, and the node between the resistor R15 and the resistor R23 is connected. Enter the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the node between the resistor R14 and the capacitor C23 through the resistor R22, the other end of the resistor R14 and the gate of the MOS transistor Q1, the Zener tube The anode of Z2 is connected, the cathode of the Zener Z2 is connected to the source of the MOS transistor Q1, the resistor Z3 is connected in parallel with the resistor R3, and the drain of the MOS transistor Q1 is the output port of the voltage VLED;

电阻R37、电容C21、电阻R39、三极管Q4、基准电压芯片U1、电容C20、电阻R40、电阻R45和电容C22，用于提供电压2V4到信号检测输入电路，电阻R37和电容C21串联，电阻R37和电容C21之间的节点接入三极管Q4的集电极，三极管Q4的基极与基准电压芯片U1的阴极，基准电压芯片U1的参考极接到电阻R40与R45之间的节点，电阻R40的另一端与三极管Q4的发射极相连，三极管Q4的集电极与基极并联有电阻R39，电阻R45两端并联有电容C20，电容C22一端接到三极管Q4的发射极，另一端接地，三极管Q4的发射极为电压2V4的输出端口。 Resistor R37, capacitor C21, resistor R39, transistor Q4, reference voltage chip U1, capacitor C20, resistor R40, resistor R45 and capacitor C22 are used to supply voltage 2V4 to the signal detection input circuit, resistor R37 and capacitor C21 in series, resistor R37 and The node between the capacitor C21 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the cathode of the reference voltage chip U1, the reference pole of the reference voltage chip U1 is connected to the node between the resistors R40 and R45, and the other end of the resistor R40 Connected to the emitter of the transistor Q4, the collector of the transistor Q4 has a resistor R39 in parallel with the base, and a capacitor C20 is connected in parallel across the resistor R45. One end of the capacitor C22 is connected to the emitter of the transistor Q4, and the other end is grounded, and the emitter of the transistor Q4 is extremely Output port of voltage 2V4.

优选的，所述霍尔检测电路包括与传感器对应管脚相连的电阻R46、电阻R47和电阻R48，以及阳极分别与各电阻串联的二极管D9、二极管D10和二极管D11；所述二极管D9、二极管D10和二极管D11的阴极相连，并连接至主控芯片对应的管脚。 Preferably, the Hall detecting circuit comprises a resistor R46 connected to a corresponding pin of the sensor, a resistor R47 and a resistor R48, and a diode D9, a diode D10 and a diode D11 respectively connected in series with the resistors; the diode D9 and the diode D10. It is connected to the cathode of the diode D11 and is connected to the corresponding pin of the main control chip.

优选的，所述三相驱动电路可分为结构相同的U、V、W三相驱动电路，其中U相电路包括组成U相自举电路的二极管D1、电容C3、电阻R19、二极管D5，以及相互串联后连接在电压BAT+与地之间的MOS管QUH1和MOS管QUL1；所述MOS管QUH1的源极与MOS管QUL1的漏极相连，MOS管QUH1与MOS管QUL1的之间的节点与U相自举电路连接，MOS管QUH1的栅极和MOS管QUL1的栅极分别通过电阻R4和电阻R24连接至主控芯片对应的管脚， MOS管QUH1与MOS管QUL1的之间的节点输出U相信号驱动无刷直流电机。 Preferably, the three-phase driving circuit can be divided into U, V, W three-phase driving circuits with the same structure, wherein the U-phase circuit comprises a diode D1, a capacitor C3, a resistor R19, a diode D5, which constitute a U-phase bootstrap circuit, and Connected in series with each other and connected to the MOS transistor QUH1 and the MOS transistor QYL1 between the voltage BAT+ and the ground; the source of the MOS transistor QUH1 is connected to the drain of the MOS transistor QYL1, and the node between the MOS transistor QUH1 and the MOS transistor QYL1 The U-phase bootstrap circuit is connected, and the gate of the MOS transistor QUH1 and the gate of the MOS transistor QYL1 are respectively connected to the corresponding pins of the main control chip through the resistor R4 and the resistor R24. The node output U-phase signal between the MOS transistor QUH1 and the MOS transistor QYL1 drives the brushless DC motor.

优选的，所述电流检测电路包括电阻R36、电阻R55、电阻R56和电容C32；电阻R36两端分别接入电阻R55和电阻R56，电阻R55和电阻R56另一端连接到主控芯片对应的管脚，电阻R55和电阻R56之间连接有滤波电容C32。 Preferably, the current detecting circuit comprises a resistor R36, a resistor R55, a resistor R56 and a capacitor C32; the resistor R36 is respectively connected to the resistor R55 and the resistor R56, and the other end of the resistor R55 and the resistor R56 is connected to the pin corresponding to the main control chip. A filter capacitor C32 is connected between the resistor R55 and the resistor R56.

优选的，还包括 Preferably, it also includes

照明指示电路，用于开机时照明，保证每次开机不低于预设的照明时间，也用于整个电路系统发生异常时的警告指示，与主控芯片相连； Illumination indicating circuit, used for lighting when starting up, ensuring that each booting is not lower than the preset lighting time, and also used for warning indication when an abnormality occurs in the entire circuit system, and is connected to the main control chip;

电量指示电路，用于开机时显示电量，每次开机最长不大于预设的电量显示时间，系统断电则自动熄灭，与主控芯片相连。 The power indicator circuit is used to display the power when the power is turned on. The maximum length of each power-on is not greater than the preset power display time. When the system is powered off, it is automatically turned off and connected to the main control chip.

优选的，所述照明指示电路包括电阻R28和发光二极管LED4，电阻R28与发光二极管LED4的阳极相连，发光二极管LED4的阴极接地。 Preferably, the illumination indicating circuit comprises a resistor R28 and a light emitting diode LED4, the resistor R28 is connected to the anode of the light emitting diode LED4, and the cathode of the light emitting diode LED4 is grounded.

优选的，所述电量指示电路包括发光二极管LED1、发光二极管LED2、发光二极管LED3、分别串联在各发光二极管的阴极与地之间的三极管Q5、三极管Q6、三极管Q7；所述各三极管的基极通过电阻R34、电阻R17和电阻R29连接至主控芯片对应的管脚。 Preferably, the electric quantity indicating circuit comprises a light emitting diode LED1, a light emitting diode LED2, a light emitting diode LED3, a triode Q5, a triode Q6 and a triode Q7 connected in series between the cathode of each light emitting diode and the ground; the base of each triode It is connected to the corresponding pin of the main control chip through the resistor R34, the resistor R17 and the resistor R29.

与现有技术相比，本实用新型具有如下优点：一、各信号检测电路模块的加入，能有效提高电动工具运行的安全性和稳定性；二、以无刷直流电机代替有刷直流电机，无机械换向产生的火花，减小噪声。 Compared with the prior art, the utility model has the following advantages: First, the addition of each signal detection circuit module can effectively improve the safety and stability of the operation of the power tool; 2. Replace the brushed DC motor with a brushless DC motor. There is no spark generated by mechanical commutation to reduce noise.

附图说明  DRAWINGS

图1 为本实用新型实施的电动工具的控制电路模块图。FIG. 1 is a block diagram of a control circuit of a power tool according to the present invention.

图2 为本实用新型实施的电源电路、照明指示、电量显示和信号检测输入电路四大模块的连接电路图。2 is a connection circuit diagram of four modules of a power supply circuit, a lighting indication, a power display, and a signal detection input circuit according to the present invention.

图3 为本实用新型实施的主控芯片及其外围相关电路电路图。FIG. 3 is a circuit diagram of a main control chip and a peripheral related circuit thereof according to the implementation of the present invention.

图4 为本实用新型实施的三相驱动电路电路图。4 is a circuit diagram of a three-phase driving circuit implemented in the present invention.

具体实施方式  detailed description

为了让本领域的技术人员更好地理解本实用新型的技术方案，下面结合附图对本实用新型作进一步阐述。 In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

本实用新型的具体实施方式如图1～图4所示，一种电动工具的控制电路，包括电源电路5，照明指示电路1，电量指示电路2，信号检测输入电路3，主控芯片4，霍尔检测电路6，三相驱动电路7，电流检测电路8。 As shown in FIG. 1 to FIG. 4, a control circuit of a power tool includes a power supply circuit 5, an illumination indicating circuit 1, a power indicating circuit 2, a signal detecting input circuit 3, and a main control chip 4, Hall detecting circuit 6, three-phase driving circuit 7, and current detecting circuit 8.

其中，主控芯片4，用于控制各电路协调工作； The main control chip 4 is used for controlling the coordination work of each circuit;

电源电路5，用于向各电路提供合适的电源，连接于锂电池组与各相关电路之间； The power circuit 5 is configured to provide a suitable power source to each circuit, and is connected between the lithium battery pack and each related circuit;

三相驱动电路7，接收主控芯片4输出的控制信号，驱动或停止电机工作，连接于主控芯片4与无刷直流电机之间； The three-phase driving circuit 7 receives the control signal outputted by the main control chip 4, drives or stops the motor operation, and is connected between the main control chip 4 and the brushless DC motor;

信号检测输入电路3，用于检测调速输入信号、检测电池组温度信号、检测电池组电压信号、检测正转/反转输入信号，与主控芯片4相连； The signal detection input circuit 3 is configured to detect the speed regulation input signal, detect the battery pack temperature signal, detect the battery pack voltage signal, detect the forward/reverse input signal, and connect with the main control chip 4;

霍尔检测电路6，提供用于电机霍尔器件的工作电源，及霍尔信号的连接输入，连接于主控芯片4与无刷直流电机之间； The Hall detecting circuit 6 provides a working power supply for the motor Hall device and a connection input of the Hall signal, and is connected between the main control chip 4 and the brushless DC motor;

电流检测电路8，检测电机的工作电流，其信号采集端连接三相驱动电路7，其信号输出端连接主控芯片4； The current detecting circuit 8 detects the working current of the motor, the signal collecting end is connected to the three-phase driving circuit 7, and the signal output end is connected to the main control chip 4;

照明指示电路1，用于开机时照明，保证每次开机不低于预设的照明时间，也用于整个电路系统发生异常时的警告指示，与主控芯片4相连； The illumination indicating circuit 1 is used for lighting when the power is turned on, ensuring that the power-on time is not lower than the preset lighting time, and is also used for warning indication when an abnormality occurs in the entire circuit system, and is connected to the main control chip 4;

电量指示电路2，用于开机时显示电量，每次开机最长不大于预设的电量显示时间，系统断电则自动熄灭，与主控芯片4相连。 The power indicating circuit 2 is configured to display the power when the power is turned on, and the maximum length of each power-on is not greater than the preset power display time, and the system is automatically turned off when the power is turned off, and is connected to the main control chip 4.

信号检测输入电路3包括 The signal detection input circuit 3 includes

上拉电阻R38和切换开关S2，用于检测无刷直流电机正/反转，切换开关S2的端口2通过上拉电阻R38与主控芯片4对应的管脚连接，切换开关S2的端口1与主控芯片4对应的管脚连接，切换开关S2的端口3与主控芯片4对应的管脚连接； The pull-up resistor R38 and the switch S2 are used for detecting the forward/reverse rotation of the brushless DC motor, and the port 2 of the switch S2 is connected to the pin corresponding to the main control chip 4 through the pull-up resistor R38, and the port 1 of the switch S2 is switched The pin corresponding to the main control chip 4 is connected, and the port 3 of the switch S2 is connected to the pin corresponding to the main control chip 4;

电阻R7、电阻R16和电容C9，用于检测电池组电压，电阻R7与电阻R16串联组成分压网络后外接开关S1与地端，电容C9并联于电阻R16两端，电阻R7与电阻R16之间的节点为检测电压输出端口，与主控芯片4对应的管脚连接； Resistor R7, resistor R16 and capacitor C9 are used to detect the voltage of the battery pack. The resistor R7 and the resistor R16 are connected in series to form a voltage divider network, and then the external switch S1 and the ground terminal are connected. The capacitor C9 is connected in parallel across the resistor R16, and between the resistor R7 and the resistor R16. The node is a detection voltage output port, and is connected to a pin corresponding to the main control chip 4;

电阻R27、热敏电阻NTC1、电阻R33和电容C16，用于检测电池组温度，电阻R27与热敏电阻NTC1串联，电阻R33和电容C16串联后与热敏电阻NTC1并联，电阻R33和电容C16之间的节点为检测温度的输出端口，与主控芯片4对应的管脚连接； Resistor R27, thermistor NTC1, resistor R33 and capacitor C16 are used to detect the battery pack temperature. The resistor R27 is connected in series with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected in series and connected in parallel with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected. The node between the nodes is an output port for detecting temperature, and is connected to a pin corresponding to the main control chip 4;

可调电阻S1VR、电阻R18和电容C11，用于调速控制，电阻R18和电容C11串联后并联于可调电阻S1VR的可调端与地端之间，电阻R18和电容C11之间的节点为调速控制信号的输出端口，与主控芯片4对应的管脚连接。 The adjustable resistor S1VR, the resistor R18 and the capacitor C11 are used for speed control. The resistor R18 and the capacitor C11 are connected in series and then connected in parallel between the adjustable end of the adjustable resistor S1VR and the ground. The node between the resistor R18 and the capacitor C11 is The output port of the speed control signal is connected to the pin corresponding to the main control chip 4.

电源电路5包括 The power circuit 5 includes

电源开关S1，控制整个电路的通电，提供总电压BAT+，并直接给三相驱动电路7供电； The power switch S1 controls the energization of the entire circuit, provides the total voltage BAT+, and directly supplies power to the three-phase driving circuit 7;

电阻R2、电容C8、二极管D4、电阻R1、电容C6、稳压二极管Z1和电容C7，用于提供电压VCC到主控芯片4，电阻R2与电容C8串联，二极管D4、电阻R1和电容C6串联后与电容C8并联，稳压二极管Z1和电容C7并联后与C6并联，电阻R1和电容C6之间的节点为电压VCC的输出端口，与主控芯片4对应的管脚连接； Resistor R2, capacitor C8, diode D4, resistor R1, capacitor C6, Zener diode Z1 and capacitor C7 are used to supply voltage VCC to main control chip 4, resistor R2 is connected in series with capacitor C8, diode D4, resistor R1 and capacitor C6 are connected in series. After being connected in parallel with the capacitor C8, the Zener diode Z1 and the capacitor C7 are connected in parallel and connected in parallel with C6. The node between the resistor R1 and the capacitor C6 is an output port of the voltage VCC, and is connected to the pin corresponding to the main control chip 4;

电阻R3、电阻R14、MOS管Q1、稳压管Z2、电阻R22、电容C13、三极管Q3、电阻R15、电阻R23、电阻R35和三极管Q2，用于提供电压VLED到照明指示电路1和电量显示电路2，电阻R15与电阻R23串联，三极管Q2的集电极与发射极并联在电阻R23上，其中，三极管Q2的发射极接地，三极管Q2的基极连接有电阻R35，电阻R15与电阻R23之间的节点接入三极管Q3的基极，三极管Q3的发射极接地，三极管Q3的集电极通过电阻R22连接到电阻R14与电容C23之间的节点，电阻R14的另一端与MOS管Q1的栅极、稳压管Z2的阳极相连，稳压管Z2的阴极连接MOS管Q1的源极，稳压管Z2的两端并联有电阻R3，MOS管Q1的漏极为电压VLED的输出端口； Resistor R3, resistor R14, MOS transistor Q1, Zener diode Z2, resistor R22, capacitor C13, transistor Q3, resistor R15, resistor R23, resistor R35 and transistor Q2 for supplying voltage VLED to illumination indicating circuit 1 and power display circuit 2. The resistor R15 is connected in series with the resistor R23. The collector and the emitter of the transistor Q2 are connected in parallel with the resistor R23. The emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected with a resistor R35, and between the resistor R15 and the resistor R23. The node is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the node between the resistor R14 and the capacitor C23 through the resistor R22, and the other end of the resistor R14 is connected to the gate of the MOS transistor Q1. The anode of the pressure tube Z2 is connected, the cathode of the Zener tube Z2 is connected to the source of the MOS tube Q1, the resistor Z3 is connected in parallel with the resistor R3, and the drain of the MOS tube Q1 is the output port of the voltage VLED;

电阻R37、电容C21、电阻R39、三极管Q4、基准电压芯片U1、电容C20、电阻R40、电阻R45和电容C22，用于提供电压2V4到信号检测输入电路3，电阻R37和电容C21串联，电阻R37和电容C21之间的节点接入三极管Q4的集电极，三极管Q4的基极与基准电压芯片U1的阴极，基准电压芯片U1的参考极接到电阻R40与R45之间的节点，电阻R40的另一端与三极管Q4的发射极相连，三极管Q4的集电极与基极并联有电阻R39，电阻R45两端并联有电容C20，电容C22一端接到三极管Q4的发射极，另一端接地，三极管Q4的发射极为电压2V4的输出端口。 Resistor R37, capacitor C21, resistor R39, transistor Q4, reference voltage chip U1, capacitor C20, resistor R40, resistor R45 and capacitor C22 are used to supply voltage 2V4 to signal detection input circuit 3, resistor R37 and capacitor C21 in series, resistor R37 The node between the capacitor C21 and the collector of the transistor Q4 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the cathode of the reference voltage chip U1, the reference pole of the reference voltage chip U1 is connected to the node between the resistors R40 and R45, and the resistor R40 is another. One end is connected to the emitter of the transistor Q4, the collector of the transistor Q4 is connected with the resistor R39 in parallel, the capacitor R22 is connected in parallel with the capacitor C20, the end of the capacitor C22 is connected to the emitter of the transistor Q4, the other end is grounded, and the emitter of the transistor Q4 is emitted. Extremely 2V4 output port.

照明指示电路1包括电阻R28和发光二极管LED4，电阻R28与发光二极管LED4的阳极相连，发光二极管LED4的阴极接地。 The illumination indicating circuit 1 includes a resistor R28 and a light emitting diode LED4. The resistor R28 is connected to the anode of the light emitting diode LED4, and the cathode of the light emitting diode LED4 is grounded.

电量指示电路2包括发光二极管LED1、发光二极管LED2、发光二极管LED3、分别串联在各发光二极管的阴极与地之间的三极管Q5、三极管Q6、三极管Q7；所述各三极管的基极通过电阻R34、电阻R17和电阻R29连接至主控芯片4对应的管脚。 The power indicating circuit 2 includes a light emitting diode LED1, a light emitting diode LED2, a light emitting diode LED3, a transistor Q5, a transistor Q6, and a transistor Q7 connected in series between the cathode of each light emitting diode and the ground; the base of each of the transistors passes through a resistor R34, The resistor R17 and the resistor R29 are connected to the corresponding pins of the master chip 4.

霍尔检测电路6包括与传感器对应管脚相连的电阻R46、电阻R47和电阻R48，以及阳极分别与各电阻串联的二极管D9、二极管D10和二极管D11；所述二极管D9、二极管D10和二极管D11的阴极相连，并连接至主控芯片4对应的管脚。 The Hall detecting circuit 6 includes a resistor R46, a resistor R47 and a resistor R48 connected to the corresponding pin of the sensor, and a diode D9, a diode D10 and a diode D11 connected in series with the resistors respectively; the diode D9, the diode D10 and the diode D11 The cathodes are connected and connected to the corresponding pins of the main control chip 4.

三相驱动电路7可分为结构相同的U、V、W三相驱动电路，其中U相电路包括组成U相自举电路的二极管D1、电容C3、电阻R19、二极管D5，以及相互串联后连接在电压BAT+与地之间的MOS管QUH1和MOS管QUL1；所述MOS管QUH1的源极与MOS管QUL1的漏极相连，MOS管QUH1与MOS管QUL1的之间的节点与U相自举电路连接，MOS管QUH1的栅极和MOS管QUL1的栅极分别通过电阻R4和电阻R24连接至主控芯片4对应的管脚， MOS管QUH1与MOS管QUL1的之间的节点输出U相信号驱动无刷直流电机。 The three-phase driving circuit 7 can be divided into U, V, W three-phase driving circuits with the same structure, wherein the U-phase circuit includes a diode D1, a capacitor C3, a resistor R19, a diode D5, which form a U-phase bootstrap circuit, and are connected in series and connected to each other. The MOS transistor QUH1 and the MOS transistor QYL1 between the voltage BAT+ and the ground; the source of the MOS transistor QUH1 is connected to the drain of the MOS transistor QYL1, and the node between the MOS transistor QUH1 and the MOS transistor QYL1 is bootstrapped with the U phase. The circuit is connected, the gate of the MOS transistor QUH1 and the gate of the MOS transistor QYL1 are respectively connected to the corresponding pins of the main control chip 4 through the resistor R4 and the resistor R24. The node output U-phase signal between the MOS transistor QUH1 and the MOS transistor QYL1 drives the brushless DC motor.

电流检测电路8包括电阻R36、电阻R55、电阻R56和电容C32；电阻R36两端分别接入电阻R55和电阻R56，电阻R55和电阻R56另一端连接到主控芯片对应的管脚，电阻R55和电阻R56之间连接有滤波电容C32。 The current detecting circuit 8 includes a resistor R36, a resistor R55, a resistor R56 and a capacitor C32. The resistor R36 is respectively connected to the resistor R55 and the resistor R56, and the other end of the resistor R55 and the resistor R56 is connected to a pin corresponding to the main control chip, and the resistor R55 and A filter capacitor C32 is connected between the resistors R56.

开关S1闭合后，首先获得电源电压BAT+；电阻R2和电容C8组成RC滤波器，经单向导通二极管D4，稳压二极管Z1限制输出电压VCC的幅度，经过限流电阻R1，滤波电容C6，电容C7滤波，输出相对稳定的电压VCC给主控芯片；锂电池组电压经偏置电阻R15、电阻R23分压从而使三极管Q3导通，电阻R3、电阻R14、电阻R22组成的分压网络使MOS管Q1导通获得电压VLED；电压VCC分支经电阻R37，电容C21滤波。电阻R39提供三极管Q4的偏置，电阻R40，电阻R45组成反馈网络提供给基准电压芯片U1保持三极管基极稳定，从而保持恒定的电压2V4输出。电容C20滤除干扰杂波，电容C22滤除纹波。 After the switch S1 is closed, the power supply voltage BAT+ is first obtained; the resistor R2 and the capacitor C8 form an RC filter, and the Zener diode D1 limits the amplitude of the output voltage VCC through the limiting resistor R1, the filter capacitor C6, and the capacitor. C7 filtering, output a relatively stable voltage VCC to the main control chip; the voltage of the lithium battery pack is divided by the bias resistor R15 and the resistor R23 to turn on the transistor Q3, and the voltage dividing network composed of the resistor R3, the resistor R14 and the resistor R22 makes the MOS The tube Q1 is turned on to obtain the voltage VLED; the voltage VCC branch is filtered through the resistor R37 and the capacitor C21. Resistor R39 provides the bias of transistor Q4, resistor R40, and resistor R45 form a feedback network to provide reference voltage chip U1 to keep the base of the transistor stable, thus maintaining a constant voltage of 2V4 output. Capacitor C20 filters out unwanted clutter, and capacitor C22 filters out ripple.

电阻R35，三极管Q2控制照明指示电路及电量指示电路的电压VLED，由主控芯片对应的管脚输出的PW_CTR信号控制，当输出为高电平时，三极管Q2导通，三极管Q3截止，MOS管Q1延迟截止，其延迟时间由电阻R3，电阻R14，电容C13组成的RC时间常数决定，延迟时间大于等于预设值。 The resistor R35 and the transistor Q2 control the voltage VLED of the illumination indicating circuit and the power indicating circuit, and are controlled by the PW_CTR signal outputted by the pin corresponding to the main control chip. When the output is high level, the transistor Q2 is turned on, the transistor Q3 is turned off, and the MOS transistor Q1 is turned off. The delay is cut off, and the delay time is determined by the RC time constant composed of the resistor R3, the resistor R14, and the capacitor C13, and the delay time is greater than or equal to a preset value.

电压VLED经电阻R28限流驱动发光二极管LED4，发光二极管LED4提供照明功能。如发生任何一种报警信号，则发光二极管LED4闪烁，以提示处于工作异常状态。 The voltage VLED is limited to drive the LED 4 through the resistor R28, and the LED 4 provides illumination. If any kind of alarm signal occurs, the LED LED4 flashes to indicate that it is in an abnormal working state.

电阻R8，电阻R34，发光二极管LED1，三极管Q5组成LED1驱动电路。主控芯片对应的管脚输出LED1信号经电阻R34控制三极管Q5的通断，即可控制发光二极管LED1的亮灭，电阻R8起限流作用；电阻R9，电阻R17，发光二极管LED2，三极管Q6组成LED2驱动电路。主控芯片对应的管脚输出LED2信号经电阻R17控制三极管Q6的通断，即可控制发光二极管LED2的亮灭，电阻R9起限流作用；电阻R10，电阻R29，发光二极管LED3，三极管Q7组成发光二极管LED3驱动电路。主控芯片对应的管脚输出LED3信号经电阻R29控制三极管Q75的通断，即可控制LED3的亮灭，电阻R10起限流作用。 Resistor R8, resistor R34, LED LED1, and transistor Q5 form the LED1 drive circuit. The pin output LED1 signal corresponding to the main control chip controls the on/off of the triode Q5 via the resistor R34, and can control the LED of the LED1, and the resistor R8 acts as a current limiting device; the resistor R9, the resistor R17, the LED 2, and the transistor Q6 LED2 drive circuit. The pin output LED2 signal corresponding to the main control chip controls the on/off of the triode Q6 via the resistor R17, and can control the LED of the LED 2, and the resistor R9 acts as a current limiting device; the resistor R10, the resistor R29, the LED 3, and the transistor Q7 Light-emitting diode LED3 drives the circuit. The pin output LED3 signal corresponding to the main control chip controls the on/off of the triode Q75 via the resistor R29, and can control the LED3 to be turned off, and the resistor R10 acts as a current limiting function.

发光二极管LED1、发光二极管LED2、发光二极管LED3用于电量显示。最长显示时间约为6S，开关S1断开，则电量显示灯自动熄灭。 The light emitting diode LED1, the light emitting diode LED2, and the light emitting diode LED3 are used for power display. The longest display time is about 6S, and when the switch S1 is turned off, the power indicator light is automatically turned off.

电阻R7，电阻R16组成分压网络，经滤波电容C9输入到主控芯片作AD转换，获取电池组实时电压。其中，主控芯片内部具有2.4V的AD参考源；电阻R27，热敏电阻NTC1组成分压网络，经电阻R33，滤波电容C16输入到主控芯片作AD转换，获取电池组实时温度；可调电阻S1VR上下滑动，中心抽头获得分压比，经电阻R18，滤波电容C11输入到主控芯片作AD转换，获取速度参考值； 切换开关S2拨向端口CW，上拉电阻R18使得端口 CW呈现高电平1，切换开关S2拨向端口CCW，上拉电阻R18使得CCW呈现高电平1。 The resistor R7 and the resistor R16 form a voltage dividing network, and are input to the main control chip for AD conversion through the filter capacitor C9 to obtain the real-time voltage of the battery pack. Among them, the main control chip has an AD reference source of 2.4V; the resistor R27 and the thermistor NTC1 form a voltage division network, and the filter capacitor C16 is input to the main control chip for AD conversion through the resistor R33, and the real-time temperature of the battery pack is obtained; The resistor S1VR slides up and down, and the center tap obtains a voltage dividing ratio. After the resistor R18, the filter capacitor C11 is input to the main control chip for AD conversion, and the speed reference value is obtained; The switch S2 is dialed to the port CW, the pull-up resistor R18 is such that the port CW assumes a high level 1, the switch S2 is dialed to the port CCW, and the pull-up resistor R18 causes the CCW to assume a high level 1.

三相驱动电路7的电流流经电阻R36，经电阻R55，电阻R56，滤波电容C32输入到主控芯片，经内部10 bits AD转换处理获取实时电流值。 The current of the three-phase driving circuit 7 flows through the resistor R36, and is input to the main control chip via the resistor R55, the resistor R56, and the filter capacitor C32. The bits AD conversion process obtains the real-time current value.

无刷直流电机内部的霍尔传感器信号经电阻R46，电阻R47，电阻R48输入到主控芯片做转子位置判断处理。二极管D9，二极管D10，二极管D11起电平钳位作用。 The Hall sensor signal inside the brushless DC motor is input to the main control chip through the resistor R46, the resistor R47, and the resistor R48 for rotor position determination processing. Diode D9, diode D10, and diode D11 act as level clamps.

主控芯片是一个单电源的集成电机预驱动器的控制器，具有6通道PWM高端预驱动和低端预驱动，内置充电泵转换电路。与外部三相驱动电路组合起来控制无刷直流电机。 The main control chip is a single-supply integrated motor pre-driver controller with 6-channel PWM high-side pre-driver and low-side pre-driver with built-in charge pump conversion circuit. Combined with an external three-phase drive circuit to control the brushless DC motor.

电容C26，电容C27用于主控芯片内核电源滤波；电容C25用于主控芯片内部电源V3P3D滤波；电容C23，电容C24用于主控芯片内部电源V7A滤波；电阻R52，电容C28，电容C29用于主控芯片内部电源V7P和V7PDRV滤波。电容C30是主控芯片内部电源V3P3A滤波。 Capacitor C26, capacitor C27 is used for main control chip core power supply filtering; capacitor C25 is used for main control chip internal power supply V3P3D filtering; capacitor C23, capacitor C24 is used for main control chip internal power supply V7A filtering; resistor R52, capacitor C28, capacitor C29 Filter the internal power supply V7P and V7PDRV of the main control chip. Capacitor C30 is the internal power supply V3P3A filter of the main control chip.

二极管D1，电容C3，电阻R19，二极管D5组成U相自举电路。当U相MOS管QUL1处于导通阶段，电源 V7P电压经二极管D1，电容C3，电阻R19，U相MOS管QUL1回路对C3充电。当MOS管QUL1关闭，QUH1导通阶段，电容C3下端电压上升到BAT+，电容C3上端电压上升到V7P + BAT+，此自举电压经端口UBOOT输入到主控芯片，经内部电路处理，输出到端口UHSD以驱动高端MOS管QUH1。电阻R11是MOS管QUH1的GS(栅源)下拉电阻，稳压管Z3限制MOS管QUH1的GS电压。电阻R24，电阻R30，稳压管Z6，MOS管QUL1组成U相低端驱动。电阻R30是MOS管QUL1的GS下拉电阻，稳压管Z6限制MOS管QUL1的GS电压。 Diode D1, capacitor C3, resistor R19, and diode D5 form a U-phase bootstrap circuit. When the U-phase MOS transistor QTL1 is in the conduction phase, the power supply The V7P voltage charges C3 through diode D1, capacitor C3, resistor R19, and U-phase MOS transistor QTL1. When MOS tube QOL1 is turned off, QUH1 is turned on, the voltage at the lower end of capacitor C3 rises to BAT+, and the voltage at the upper end of capacitor C3 rises to V7P. + BAT+, this bootstrap voltage is input to the main control chip via the port UBOOT, processed by the internal circuit, and output to the port UHSD to drive the high-end MOS transistor QUH1. The resistor R11 is a GS (gate source) pull-down resistor of the MOS transistor QUH1, and the Zener diode Z3 limits the GS voltage of the MOS transistor QUH1. The resistor R24, the resistor R30, the Zener diode Z6, and the MOS transistor QYL1 form a U-phase low-end drive. The resistor R30 is the GS pull-down resistor of the MOS transistor QYL1, and the Zener diode Z6 limits the GS voltage of the MOS transistor QYL1.

二极管D2，电容C4，电阻R20，二极管D6组成V相自举电路。当V相MOS管QVL1处于导通阶段，电源V7P电压经二极管D2，电容C4，电阻R20，V相MOS管QVL1回路对C4充电。当MOS管QVL1关闭，QVH1导通阶段，电容C4下端电压上升到BAT+，电容C4上端电压上升到V7P + BAT+，此自举电压经端口VBOOT输入到主控芯片，经内部电路处理，输出到端口VHSD以驱动高端MOS管QVH1。电阻R12是MOS管QVH1的GS(栅源)下拉电阻，稳压管Z4限制MOS管QVH1的GS电压。电阻R25，电阻R31，稳压管Z7，MOS管QVL1组成V相低端驱动。电阻R31是MOS管QVL1的GS下拉电阻，稳压管Z7限制MOS管QVL1的GS电压。 Diode D2, capacitor C4, resistor R20, and diode D6 form a V-phase bootstrap circuit. When the V-phase MOS transistor QVL1 is in the conduction phase, the power supply V7P voltage is charged to the C4 via the diode D2, the capacitor C4, the resistor R20, and the V-phase MOS transistor QVL1. When the MOS transistor QVL1 is turned off and the QVH1 is turned on, the voltage at the lower end of the capacitor C4 rises to BAT+, and the voltage at the upper end of the capacitor C4 rises to V7P. + BAT+, this bootstrap voltage is input to the main control chip through the port VBOOT, processed by the internal circuit, and output to the port VHSD to drive the high-end MOS transistor QVH1. The resistor R12 is a GS (gate source) pull-down resistor of the MOS transistor QVH1, and the Zener diode Z4 limits the GS voltage of the MOS transistor QVH1. Resistor R25, resistor R31, Zener diode Z7, MOS transistor QVL1 form the V-phase low-end drive. The resistor R31 is the GS pull-down resistor of the MOS transistor QVL1, and the Zener diode Z7 limits the GS voltage of the MOS transistor QVL1.

二极管D3，电容C5，电阻R21，二极管D7组成W相自举电路。当W相MOS管QWL1处于导通阶段，电源V7P电压经二极管D3，电容C5，电阻R21，W相MOS管QWL1回路对C5充电。当MOS管QWL1关闭，QWH1导通阶段，电容C5下端电压上升到BAT+，电容C5上端电压上升到V7P + BAT+，此自举电压经WBOOT输入到主控芯片，经内部电路处理，输出到端口WHSD以驱动高端MOS管QWH1。电阻R13是MOS管QWH1的GS(栅源)下拉电阻，稳压管Z5限制MOS管QWH1的GS电压。电阻R26，电阻R32，稳压管Z8，MOS管QWL1组成W相低端驱动。电阻R32是MOS管QWL1的GS下拉电阻，稳压管Z8限制MOS管QWL1的GS电压。 Diode D3, capacitor C5, resistor R21, and diode D7 form a W-phase bootstrap circuit. When the W-phase MOS transistor QWL1 is in the conducting phase, the power supply V7P voltage is charged to the C5 via the diode D3, the capacitor C5, the resistor R21, and the W-phase MOS transistor QWL1. When the MOS transistor QWL1 is turned off and the QWH1 is turned on, the voltage at the lower end of the capacitor C5 rises to BAT+, and the voltage at the upper end of the capacitor C5 rises to V7P. + BAT+, this bootstrap voltage is input to the main control chip via WBOOT, processed by internal circuit, and output to port WHSD to drive high-end MOS transistor QWH1. The resistor R13 is a GS (gate source) pull-down resistor of the MOS transistor QWH1, and the Zener diode Z5 limits the GS voltage of the MOS transistor QWH1. Resistor R26, resistor R32, Zener diode Z8, MOS transistor QWL1 form the W phase low-end drive. The resistor R32 is the GS pull-down resistor of the MOS transistor QWL1, and the Zener diode Z8 limits the GS voltage of the MOS transistor QWL1.

主控芯片依据检测到的信息来控制三相驱动电路输出。具体过程如下： The master chip controls the output of the three-phase drive circuit based on the detected information. The specific process is as follows:

电流检测信号CSP/CSN，经主控芯片内部10 bits AD转换，获得实时工作电流值，如果此电流值小于所设定的最大工作电流值，那么主控芯片输出相应占空比的U/V/W三相PWM信号给三相驱动电路，驱动无刷直流电机工作。否则主控芯片关闭U/V/W三相PWM信号，停止无刷直流电机工作。 Current detection signal CSP/CSN, 10 bits inside the main control chip AD conversion, obtain real-time working current value, if the current value is less than the set maximum working current value, then the main control chip outputs the U/V/W three-phase PWM signal with corresponding duty ratio to the three-phase driving circuit, and the driving is not Brush DC motor work. Otherwise, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.

霍尔检测信号经主控芯片分析处理，未出现霍尔信号异常，那么主控芯片输出相应占空比的U/V/W三相PWM信号给三相驱动电路，驱动无刷直流电机工作。如发生断线或短路情形时，主控芯片关闭U/V/W三相PWM信号，停止无刷直流电机工作。 The Hall detection signal is analyzed and processed by the main control chip, and the Hall signal is not abnormal. Then the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase driving circuit to drive the brushless DC motor. In the event of a disconnection or short circuit, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.

调速信号SV经主控芯片内部10 bits AD转换，获得参考速度，主控芯片输出相应占空比的U/V/W三相PWM信号给三相驱动电路，驱动无刷直流电机。 Speed control signal SV through the internal control chip 10 bits AD conversion, obtain the reference speed, the main control chip outputs the corresponding duty cycle U/V/W three-phase PWM signal to the three-phase drive circuit to drive the brushless DC motor.

电压检测信号BAT_AD经主控芯片内部10 bits AD转换，获得锂电池组实时电压，如果此电压在+15V-24V之间，那么主控芯片输出相应占空比的U/V/W三相PWM信号给三相驱动电路，驱动无刷直流电机工作。否则主控芯片关闭U/V/W三相PWM信号，停止无刷直流电机工作。 The voltage detection signal BAT_AD is 10 bits inside the main control chip. AD conversion, obtain the real-time voltage of the lithium battery pack. If the voltage is between +15V and 24V, the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase drive circuit to drive the brushless DC. The motor works. Otherwise, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.

温度检测信号BAT_NTC经主控芯片内部10 bits AD转换，获得锂电池组实时温度，如果此温度在0℃-45℃之间，那么主控芯片输出相应占空比的U/V/W三相PWM信号给三相驱动电路，驱动无刷直流电机工作。否则主控芯片关闭U/V/W三相PWM信号，停止无刷直流电机工作。 Temperature detection signal BAT_NTC via the internal control chip 10 bits AD conversion, obtain the real-time temperature of the lithium battery pack. If the temperature is between 0°C and 45°C, the main control chip outputs the U/V/W three-phase PWM signal with the corresponding duty ratio to the three-phase drive circuit to drive the brushless DC motor works. Otherwise, the main control chip turns off the U/V/W three-phase PWM signal to stop the brushless DC motor.

正/反转检测信号CW/CCW经主控芯片读取，主控芯片依据下表输出相应占空比的U/V/W三相PWM信号给三相驱动电路。 The positive/reverse detection signal CW/CCW is read by the main control chip, and the main control chip outputs the U/V/W three-phase PWM signal of the corresponding duty ratio to the three-phase driving circuit according to the following table.

输出状态 Output status 停止输出 Stop output 正转 Forward 反转 Reverse 停止输出 Stop output CW 电平 CW level 0 0 1 1 0 0 1 1 CCW 电平 CCW level 0 0 0 0 1 1 1 1

以上为本实用新型较佳的实现方式，需要说明的是，在不背离本实用新型精神及其实质的情况下，熟悉本领域的技术人员当可根据本实用新型作出各种相应的改变和变形，但这些改变和变形都应属于本实用新型所附的权利要求的保护范围。 The above is a preferred implementation of the present invention. It should be noted that those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and spirit of the present invention. However, such changes and modifications are intended to be included within the scope of the appended claims.

Claims (9)

一 种电动工具的控制电路，连接于锂电池组与无刷直流电机之间，包括A control circuit for a power tool is connected between the lithium battery pack and the brushless DC motor, including 主控芯片（4），用于控制各电路协调工作；The main control chip (4) is used for controlling the coordination work of each circuit; 其特征在于：还包括，It is characterized by: 电源电路（5），用于向各电路提供合适的电源，连接于锂电池组与各相关电路之间；a power circuit (5) for supplying a suitable power source to each circuit, connected between the lithium battery pack and each related circuit; 三相驱动电路（7），接收主控芯片（4）输出的控制信号，驱动或停止电机工作，连接于主控芯片（4）与无刷直流电机之间；The three-phase driving circuit (7) receives the control signal outputted by the main control chip (4), drives or stops the motor operation, and is connected between the main control chip (4) and the brushless DC motor; 信号检测输入电路（3），用于检测调速输入信号、检测电池组温度信号、检测电池组电压信号、检测正转/反转输入信号，与主控芯片（4）相连；The signal detection input circuit (3) is configured to detect the speed regulation input signal, detect the battery pack temperature signal, detect the battery pack voltage signal, detect the forward/reverse input signal, and connect with the main control chip (4); 霍尔检测电路（6），提供用于电机霍尔器件的工作电源，及霍尔信号的连接输入，连接于主控芯片（4）与无刷直流电机之间；The Hall detecting circuit (6) provides a working power supply for the motor Hall device and a connection input of the Hall signal, and is connected between the main control chip (4) and the brushless DC motor; 电流检测电路（8），检测电机的工作电流，其信号采集端连接三相驱动电路（7），其信号输出端连接主控芯片（4）。 The current detecting circuit (8) detects the working current of the motor, and the signal collecting end is connected to the three-phase driving circuit (7), and the signal output end is connected to the main control chip (4). 根 权利要求1所述的电动工具的控制电路，其特征在于，所述信号检测输入电路（3）包括A control circuit for a power tool according to claim 1, wherein said signal detecting input circuit (3) comprises 上拉电阻R38和切换开关S2，用于检测无刷直流电机正/反转，切换开关S2的端口2通过上拉电阻R38与主控芯片（4）对应的管脚连接，切换开关S2的端口1与主控芯片（4）对应的管脚连接，切换开关S2的端口3与主控芯片（4）对应的管脚连接；The pull-up resistor R38 and the switch S2 are used for detecting the forward/reverse rotation of the brushless DC motor, and the port 2 of the switch S2 is connected to the pin corresponding to the main control chip (4) through the pull-up resistor R38, and the port of the switch S2 is switched. 1 is connected to the pin corresponding to the main control chip (4), and the port 3 of the switch S2 is connected to the pin corresponding to the main control chip (4); 电阻R7、电阻R16和电容C9，用于检测电池组电压，电阻R7与电阻R16串联组成分压网络后外接开关S1与地端，电容C9并联于电阻R16两端，电阻R7与电阻R16之间的节点为检测电压输出端口，与主控芯片（4）对应的管脚连接；Resistor R7, resistor R16 and capacitor C9 are used to detect the voltage of the battery pack. The resistor R7 and the resistor R16 are connected in series to form a voltage divider network, and then the external switch S1 and the ground terminal are connected. The capacitor C9 is connected in parallel across the resistor R16, and between the resistor R7 and the resistor R16. The node is a detection voltage output port, and is connected to a pin corresponding to the main control chip (4); 电阻R27、热敏电阻NTC1、电阻R33和电容C16，用于检测电池组温度，电阻R27与热敏电阻NTC1串联，电阻R33和电容C16串联后与热敏电阻NTC1并联，电阻R33和电容C16之间的节点为检测温度的输出端口，与主控芯片（4）对应的管脚连接；Resistor R27, thermistor NTC1, resistor R33 and capacitor C16 are used to detect the battery pack temperature. The resistor R27 is connected in series with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected in series and connected in parallel with the thermistor NTC1. The resistor R33 and the capacitor C16 are connected. The node between the nodes is an output port for detecting temperature, and is connected to a pin corresponding to the main control chip (4); 可调电阻S1VR、电阻R18和电容C11，用于调速控制，电阻R18和电容C11串联后并联于可调电阻S1VR的可调端与地端之间，电阻R18和电容C11之间的节点为调速控制信号的输出端口，与主控芯片（4）对应的管脚连接。The adjustable resistor S1VR, the resistor R18 and the capacitor C11 are used for speed control. The resistor R18 and the capacitor C11 are connected in series and then connected in parallel between the adjustable end of the adjustable resistor S1VR and the ground. The node between the resistor R18 and the capacitor C11 is The output port of the speed control signal is connected to the pin corresponding to the main control chip (4). 根据 权利要求2所述的电动工具的控制电路，其特征在于，所述电源电路（5）包括A control circuit for a power tool according to claim 2, wherein said power supply circuit (5) comprises 电源开关S1，控制整个电路的通电，提供总电压BAT+，并直接给三相驱动电路（7）供电；The power switch S1 controls the energization of the entire circuit, provides the total voltage BAT+, and directly supplies power to the three-phase driving circuit (7); 电阻R2、电容C8、二极管D4、电阻R1、电容C6、稳压二极管Z1和电容C7，用于提供电压VCC到主控芯片（4），电阻R2与电容C8串联，二极管D4、电阻R1和电容C6串联后与电容C8并联，稳压二极管Z1和电容C7并联后与C6并联，电阻R1和电容C6之间的节点为电压VCC的输出端口，与主控芯片（4）对应的管脚连接；Resistor R2, capacitor C8, diode D4, resistor R1, capacitor C6, Zener diode Z1 and capacitor C7 are used to supply voltage VCC to the main control chip (4), resistor R2 is connected in series with capacitor C8, diode D4, resistor R1 and capacitor After C6 is connected in series, it is connected in parallel with capacitor C8. Zener diode Z1 and capacitor C7 are connected in parallel and connected in parallel with C6. The node between resistor R1 and capacitor C6 is the output port of voltage VCC, which is connected with the pin corresponding to the main control chip (4). 电阻R3、电阻R14、MOS管Q1、稳压管Z2、电阻R22、电容C13、三极管Q3、电阻R15、电阻R23、电阻R35和三极管Q2，用于提供电压VLED到照明指示电路（1）和电量显示电路（2），电阻R15与电阻R23串联，三极管Q2的集电极与发射极并联在电阻R23上，其中，三极管Q2的发射极接地，三极管Q2的基极连接有电阻R35，电阻R15与电阻R23之间的节点接入三极管Q3的基极，三极管Q3的发射极接地，三极管Q3的集电极通过电阻R22连接到电阻R14与电容C23之间的节点，电阻R14的另一端与MOS管Q1的栅极、稳压管Z2的阳极相连，稳压管Z2的阴极连接MOS管Q1的源极，稳压管Z2的两端并联有电阻R3，MOS管Q1的漏极为电压VLED的输出端口；Resistor R3, resistor R14, MOS transistor Q1, Zener diode Z2, resistor R22, capacitor C13, transistor Q3, resistor R15, resistor R23, resistor R35 and transistor Q2 are used to supply voltage VLED to the illumination indicating circuit (1) and the amount of power Display circuit (2), resistor R15 and resistor R23 in series, the collector and emitter of transistor Q2 are connected in parallel with resistor R23, wherein the emitter of transistor Q2 is grounded, the base of transistor Q2 is connected with resistor R35, resistor R15 and resistor The node between R23 is connected to the base of transistor Q3, the emitter of transistor Q3 is grounded, the collector of transistor Q3 is connected to the node between resistor R14 and capacitor C23 through resistor R22, and the other end of resistor R14 is connected to MOS transistor Q1. The anode of the gate and the Zener Z2 is connected, the cathode of the Zener Z2 is connected to the source of the MOS transistor Q1, the resistor Z3 is connected in parallel with the resistor R3, and the drain of the MOS transistor Q1 is the output port of the voltage VLED; 电阻R37、电容C21、电阻R39、三极管Q4、基准电压芯片U1、电容C20、电阻R40、电阻R45和电容C22，用于提供电压2V4到信号检测输入电路（3），电阻R37和电容C21串联，电阻R37和电容C21之间的节点接入三极管Q4的集电极，三极管Q4的基极与基准电压芯片U1的阴极，基准电压芯片U1的参考极接到电阻R40与R45之间的节点，电阻R40的另一端与三极管Q4的发射极相连，三极管Q4的集电极与基极并联有电阻R39，电阻R45两端并联有电容C20，电容C22一端接到三极管Q4的发射极，另一端接地，三极管Q4的发射极为电压2V4的输出端口。Resistor R37, capacitor C21, resistor R39, transistor Q4, reference voltage chip U1, capacitor C20, resistor R40, resistor R45 and capacitor C22 are used to supply voltage 2V4 to signal detection input circuit (3), resistor R37 and capacitor C21 in series, The node between the resistor R37 and the capacitor C21 is connected to the collector of the transistor Q4, the base of the transistor Q4 is connected to the cathode of the reference voltage chip U1, the reference pole of the reference voltage chip U1 is connected to the node between the resistors R40 and R45, and the resistor R40 The other end is connected to the emitter of the transistor Q4. The collector of the transistor Q4 has a resistor R39 connected in parallel with the base, and the capacitor R20 is connected in parallel with a capacitor C20. The capacitor C22 is connected to the emitter of the transistor Q4 at one end, and the other end is grounded, and the transistor Q4 is connected. The output is extremely voltage 2V4 output port. 根据权利要求3所述的电动工具的控制电路，其特征在于，所述霍尔检测电路（6）包括与传感器对应管脚相连的电阻R46、电阻R47和电阻R48，以及阳极分别与各电阻串联的二极管D9、二极管D10和二极管D11；所述二极管D9、二极管D10和二极管D11的阴极相连，并连接至主控芯片（4）对应的管脚。The control circuit for a power tool according to claim 3, wherein said Hall detecting circuit (6) comprises a resistor R46, a resistor R47 and a resistor R48 connected to a corresponding pin of the sensor, and the anode is connected in series with each resistor. The diode D9, the diode D10 and the diode D11; the diode D9, the diode D10 and the cathode of the diode D11 are connected, and are connected to the corresponding pins of the main control chip (4). 根据权利要求4所述的电动工具的控制电路，其特征在于，所述三相驱动电路（7）可分为结构相同的U、V、W三相驱动电路，其中U相电路包括组成U相自举电路的二极管D1、电容C3、电阻R19、二极管D5，以及相互串联后连接在电压BAT+与地之间的MOS管QUH1和MOS管QUL1；所述MOS管QUH1的源极与MOS管QUL1的漏极相连，MOS管QUH1与MOS管QUL1的之间的节点与U相自举电路连接，MOS管QUH1的栅极和MOS管QUL1的栅极分别通过电阻R4和电阻R24连接至主控芯片（4）对应的管脚， MOS管QUH1与MOS管QUL1的之间的节点输出U相信号驱动无刷直流电机。 The control circuit for a power tool according to claim 4, wherein said three-phase driving circuit (7) is divided into U, V, W three-phase driving circuits of the same structure, wherein the U-phase circuit comprises a U-phase The diode D1 of the bootstrap circuit, the capacitor C3, the resistor R19, the diode D5, and the MOS transistor QUH1 and the MOS transistor QYL1 connected in series with each other between the voltage BAT+ and the ground; the source of the MOS transistor QUH1 and the MOS transistor QYL1 The drain is connected, the node between the MOS transistor QUH1 and the MOS transistor QYL1 is connected to the U-phase bootstrap circuit, and the gate of the MOS transistor QUH1 and the gate of the MOS transistor QYL1 are respectively connected to the main control chip through the resistor R4 and the resistor R24 ( 4) Corresponding pins, The node output U-phase signal between the MOS transistor QUH1 and the MOS transistor QYL1 drives the brushless DC motor. 根据权利要求5所述的电动工具的控制电路，其特征在于，所述电流检测电路（8）包括电阻R36、电阻R55、电阻R56和电容C32；电阻R36两端分别接入电阻R55和电阻R56，电阻R55和电阻R56另一端连接到主控芯片对应的管脚，电阻R55和电阻R56之间连接有滤波电容C32。The control circuit for a power tool according to claim 5, wherein the current detecting circuit (8) comprises a resistor R36, a resistor R55, a resistor R56 and a capacitor C32; and a resistor R55 and a resistor R56 are respectively connected at both ends of the resistor R36. The other end of the resistor R55 and the resistor R56 are connected to the corresponding pin of the main control chip, and the filter capacitor C32 is connected between the resistor R55 and the resistor R56. 根据 权利要求6所述的电动工具的控制电路，其特征在于，还包括A control circuit for a power tool according to claim 6, further comprising 照明指示电路（1），用于开机时照明，保证每次开机不低于预设的照明时间，也用于整个电路系统发生异常时的警告指示，与主控芯片（4）相连；The illumination indicating circuit (1) is used for lighting when the power is turned on, ensuring that the power-on time is not lower than the preset lighting time, and is also used for warning indication when an abnormality occurs in the entire circuit system, and is connected to the main control chip (4); 电量指示电路（2），用于开机时显示电量，每次开机最长不大于预设的电量显示时间，系统断电则自动熄灭，与主控芯片（4）相连。The power indicating circuit (2) is used to display the power when the power is turned on, and the maximum time of each power-on is not greater than the preset power display time, and the system is automatically turned off when the power is turned off, and is connected to the main control chip (4). 根据权利要求7所述的电动工具的控制电路，其特征在于，所述照明指示电路（1）包括电阻R28和发光二极管LED4，电阻R28与发光二极管LED4的阳极相连，发光二极管LED4的阴极接地。The control circuit for a power tool according to claim 7, wherein the illumination indicating circuit (1) comprises a resistor R28 and a light emitting diode LED4, the resistor R28 is connected to the anode of the light emitting diode LED4, and the cathode of the light emitting diode LED4 is grounded. 根据权利要求8所述的电动工具的控制电路，其特征在于，所述电量指示电路（2）包括发光二极管LED1、发光二极管LED2、发光二极管LED3、分别串联在各发光二极管的阴极与地之间的三极管Q5、三极管Q6、三极管Q7；所述各三极管的基极通过电阻R34、电阻R17和电阻R29连接至主控芯片（4）对应的管脚。 The control circuit for a power tool according to claim 8, wherein the electric quantity indicating circuit (2) comprises a light emitting diode LED1, a light emitting diode LED2, and a light emitting diode LED3, which are respectively connected in series between the cathode of each light emitting diode and the ground. The transistor Q5, the transistor Q6, and the transistor Q7; the base of each of the transistors is connected to the corresponding pin of the main control chip (4) through a resistor R34, a resistor R17 and a resistor R29.
PCT/CN2013/086525 2013-09-09 2013-11-05 Electric tool control circuit Ceased WO2015032126A1 (en)

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CN113783274A (en) * 2021-09-24 2021-12-10 合肥国轩高科动力能源有限公司 Power supply based on cascade utilization battery design
CN114002974A (en) * 2021-09-30 2022-02-01 南京三一光电科技有限公司 Direct current intelligence junction box
CN114725891A (en) * 2022-05-16 2022-07-08 重庆科创职业学院 Overload protection device for direct current servo motor of numerical control machine tool
CN115459205A (en) * 2022-08-03 2022-12-09 东风汽车集团股份有限公司 A safety control circuit, system and vehicle
CN115626123A (en) * 2022-10-12 2023-01-20 东风汽车集团股份有限公司 A vehicle protection circuit, system and vehicle
CN116107258A (en) * 2023-03-02 2023-05-12 杭州电子科技大学 A two-wire piezoelectric pneumatic valve positioner circuit based on STM32L1
CN116578026A (en) * 2023-05-15 2023-08-11 中科芯集成电路有限公司 An automatic switching control system and test method of a control board burning test mode
CN120320639A (en) * 2025-06-12 2025-07-15 广东惠利普智能科技股份有限公司 A connection circuit for a brushless motor compatible with a brushed motor main control board

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