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WO2018149031A1 - 压缩机保护电路和空调器 - Google Patents

压缩机保护电路和空调器 Download PDF

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Publication number
WO2018149031A1
WO2018149031A1 PCT/CN2017/082510 CN2017082510W WO2018149031A1 WO 2018149031 A1 WO2018149031 A1 WO 2018149031A1 CN 2017082510 W CN2017082510 W CN 2017082510W WO 2018149031 A1 WO2018149031 A1 WO 2018149031A1
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WO
WIPO (PCT)
Prior art keywords
module
resistor
compressor
output
voltage
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/CN2017/082510
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English (en)
French (fr)
Inventor
鲍殿生
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.)
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Guangdong Midea Refrigeration Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong Midea Refrigeration Equipment Co Ltd filed Critical Guangdong Midea Refrigeration Equipment Co Ltd
Publication of WO2018149031A1 publication Critical patent/WO2018149031A1/zh
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
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Definitions

  • the present invention relates to the field of compressor protection circuits, and more particularly to a compressor protection circuit and an air conditioner.
  • the driving scheme of the outdoor compressor of the inverter air conditioner is usually obtained by rectifying and filtering the AC power source to obtain the DC bus power supply, and the DC bus power source is subjected to the power factor correction processing by the power factor correction circuit, and then the power is supplied to the intelligent power module, and finally The intelligent power module directly drives the compressor to work.
  • the MCU in the inverter air conditioner outputs a driving signal to enable the intelligent power module to drive the compressor according to the corresponding phase current.
  • the prior art provides a compressor current protection circuit for inputting the phase current of the compressor to the first comparator by converting the magnitude of the current used into a sampled voltage signal. And comparing with the reference voltage value, when the compressor over-current causes the sampling voltage signal to rise, causing the first comparator output to flip to output a protection signal to control the output of the intelligent power module to be turned off, so that when the phase current of the compressor is too large The intelligent power module is turned off its phase current output to protect the compressor.
  • the following problems will be encountered: since the increase of the compressor current is a continuously changing time process, there is a fluctuation time when the voltage sampling signal approaches the reference voltage value, that is, the magnitude of the sampled voltage value is the same as the reference voltage. Or a critical value of the small difference, the sampled voltage value fluctuates around the reference voltage value for a period of time, so that the output state of the first comparator is unstable during this time period, thereby causing the protection state of the intelligent power module to be unstable; Or because there is an interference signal on the phase current of the compressor, the sampled voltage value is lower or higher than the reference voltage value in a short time, which also causes the protection state of the intelligent power module to be unstable, and the protection state of the intelligent power module is not Stabilization will cause the intelligent power module to drive the compressor uncontrollable, and there is a problem that the intelligent power module is damaged.
  • the main object of the present invention is to provide a compressor protection circuit and an air conditioner, which aims to solve the problem that the protection power state is unstable during the compressor overcurrent protection circuit, and the intelligent power module drives the compressor uncontrollable to cause damage of the intelligent power module.
  • the present invention provides a compressor protection circuit including a current sampling module, a voltage comparison module, a reference voltage module, a shaping module, an MCU, and an intelligent power module;
  • the driving signal output by the MCU outputs a phase current to drive the compressor to operate;
  • the reference voltage module generates a reference voltage output to the first input end of the voltage comparison module;
  • the current sampling module performs a phase current of the compressor Sampling and outputting a corresponding sampled voltage signal to a second input of the voltage comparison module;
  • the voltage comparison module comparing the sampled voltage signal with the reference voltage signal, and wherein the sampled voltage signal is greater than
  • the output protection signal is shaped to the smart power module by the shaping module;
  • the intelligent power module turns off the output phase current according to the protection signal to stop the compressor operation, and simultaneously outputs the fault protection signal to enable the Said MCU stops outputting said drive signal;
  • said compressor protects Circuit further comprises:
  • the input end is connected to the output end of the voltage comparison module, and the output end is connected to the first input end of the voltage comparison module; when the voltage comparison module is in the compressor phase current is excessively greater than the preset value output protection During the signal, the protection signal output by the voltage comparison module is fed back to the first input end of the voltage comparison module, so that the voltage value of the first input end of the voltage comparison module is lowered.
  • the voltage comparison module includes a first comparator
  • the first input end of the voltage comparison module is connected to the non-inverting input end of the first comparator, and the second input end of the voltage comparison module is connected to the reverse phase input end of the first comparator.
  • the feedback module includes a first resistor
  • One end of the first resistor is an input end of the feedback module, and the other end of the first resistor is an output end of the feedback module.
  • the feedback module includes a first diode
  • the cathode of the first diode is an input end of the feedback module, and the anode of the first diode is an output end of the feedback module.
  • the feedback module includes a second resistor and a second diode
  • a cathode of the second diode is an input end of the feedback module, an anode of the second diode is connected to one end of the second resistor, and another end of the second resistor is a feedback module Output.
  • the shaping module comprises a third resistor and a first NPN transistor
  • the base of the first NPN transistor is extremely at the input end of the shaping module, the emitter of the first NPN transistor is grounded, and the common electrode of the collector of the first NPN transistor and the third resistor For the output end of the shaping module, the other end of the third resistor is connected to a DC power source.
  • the shaping module comprises a fourth resistor, a second NPN transistor and a third NPN transistor;
  • the base of the second NPN transistor is substantially the input end of the shaping module, the emitter of the second NPN transistor is connected to the base of the third NPN transistor, and the collector of the second NPN transistor is The common junction of the collector of the third NPN transistor and the end of the fourth resistor is an output end of the shaping module, the other end of the fourth resistor is connected to a DC power source, and the emitter of the third NPN transistor is grounded.
  • the shaping module comprises a fifth resistor, a fourth NPN transistor and a fifth PNP transistor;
  • the base of the fourth NPN transistor is substantially the input end of the shaping module, the collector of the fourth NPN transistor is connected to the base of the fifth PNP transistor, and the emitter of the fifth PNP transistor is The common junction of one end of the fifth resistor is an output end of the shaping module, the other end of the fifth resistor is connected to a DC power source, and an emitter of the fourth NPN transistor is grounded.
  • the shaping module comprises a sixth resistor and a sixth PNP transistor;
  • the base of the sixth PNP type transistor is substantially the input end of the shaping module, the emitter of the sixth PNP type transistor is connected to a DC power source, the collector of the sixth PNP type transistor is at one end of the sixth resistor
  • the common junction is the output end of the shaping module, and the other end of the sixth resistor is connected to the ground.
  • the compressor protection circuit further includes a temperature protection module, an input end of the temperature protection module is connected to the smart power module, and an output end of the temperature protection module is connected to a second input end of the voltage comparison module;
  • the smart power module When the temperature of the smart power module is too high, the smart power module outputs a temperature protection signal to the second input end of the voltage comparison module through the temperature protection module, so that the voltage comparison module outputs a protection signal to the smart power module.
  • the smart power module turns off the output phase current according to the protection signal to stop the compressor operation.
  • the temperature protection module includes a sixth resistor, a seventh resistor, and a third diode;
  • One end of the sixth resistor is an input end of the temperature protection module, and the other end of the sixth resistor and one end of the seventh resistor are connected to an anode of the third diode, the third The cathode of the diode is the output of the temperature protection module, and the other end of the seventh resistor is grounded.
  • the voltage comparison module further includes an eighth resistor, one end of the eighth resistor is connected to the output end of the first comparator, and the other end is connected to a DC power source.
  • the shaping module further comprises a ninth resistor, one end of the ninth resistor is connected to the base of the first NPN transistor, and the other end is connected to the DC power source.
  • the present invention also provides an air conditioner including the compressor protection circuit.
  • the compressor protection circuit provided by the invention adds a feedback module by having a current sampling module, a reference voltage module, a voltage comparison module, a shaping module, an MCU and an intelligent power module, because the feedback module is connected to the reference voltage input end of the voltage comparison module and The output makes the voltage comparison module's protection and recovery reference voltage values different. It solves that the output state of the voltage comparison module is unstable due to the fluctuation of the input voltage of the voltage comparison module and the reference voltage value, which leads to the instability of the protection state of the intelligent power module, which causes the intelligent power module to drive the compressor uncontrollable, and finally leads to intelligence. The problem of power module damage.
  • FIG. 1 is a schematic structural view of a module of a first embodiment of a compressor protection circuit of the present invention
  • FIG. 2 is a circuit structural diagram of a second embodiment of a compressor protection circuit of the present invention.
  • FIG. 3 is a circuit structural diagram of a third embodiment of a compressor protection circuit of the present invention.
  • FIG. 4 is a circuit structural diagram of a fourth embodiment of a compressor protection circuit of the present invention.
  • Figure 5 is a circuit configuration diagram of a fifth embodiment of a compressor protection circuit of the present invention.
  • Figure 6 is a circuit diagram showing another circuit of the fifth embodiment of the compressor protection circuit of the present invention.
  • Figure 7 is a circuit diagram showing another circuit of the fifth embodiment of the compressor protection circuit of the present invention.
  • Figure 8 is a circuit structural view of a sixth embodiment of a compressor protection circuit of the present invention.
  • Figure 9 is a block diagram showing another circuit of the sixth embodiment of the compressor protection circuit of the present invention.
  • FIG. 10 is a schematic structural view of a module of a seventh embodiment of a compressor protection circuit of the present invention.
  • Figure 11 is a circuit structural view showing a seventh embodiment of the compressor protection circuit of the present invention.
  • Figure 12 is a block diagram showing another circuit of the seventh embodiment of the compressor protection circuit of the present invention.
  • FIG. 1 is a block diagram of a compressor protection circuit according to a first embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail as follows:
  • the compressor protection circuit provided by the embodiment of the present invention includes a current sampling module 10, a voltage comparison module 20, a reference voltage module 30, a shaping module 80, an MCU 50, and an intelligent power module 70.
  • the intelligent power module 70 outputs a phase according to a driving signal output by the MCU 50.
  • the current is driven to drive the compressor;
  • the reference voltage module 30 generates a reference voltage output to the first input of the voltage comparison module 20;
  • the current sampling module 10 samples the phase current of the compressor and outputs a corresponding sampled voltage signal to the voltage comparison module 20
  • the voltage comparison module 20 compares the sampling voltage signal with the reference voltage signal, and when the sampling voltage signal is greater than the reference voltage signal, outputs the protection signal to the intelligent power module 70 via the shaping module 80; the intelligent power module 70 according to the protection
  • the signal turns off the output phase current to stop the compressor operation, and simultaneously outputs a fault protection signal to stop the MCU 50 from outputting the driving signal;
  • the compressor protection circuit further includes:
  • the feedback module 40 has an input end connected to the output end of the voltage comparison module 20, and an output end connected to the first input end of the voltage comparison module 20; when the voltage comparison module 20 outputs a protection signal when the compressor phase current is excessively greater than a preset value The protection signal output by the voltage comparison module 20 is fed back to the first input end of the voltage comparison module 20, so that the voltage value of the first input terminal of the voltage comparison module 20 is lowered.
  • the compressor protection circuit provided by the embodiment of the present invention adds the feedback module 40 by having the current sampling module 10, the voltage comparison module 20, the reference voltage module 30, the shaping module 80, the MCU 50, and the intelligent power module 60, because the feedback module 30 is connected to the voltage. Comparing the first input end and the output end of the module 20, the first input end is connected to the output end of the reference voltage module 30, and is fed back to the first input of the voltage comparison module 20 through the feedback module 30 when the voltage comparison module 20 outputs the protection signal. End, the voltage value of the first input terminal of the voltage comparison module 20 is lowered, thereby changing the reference voltage value output by the reference voltage module 30 to the voltage comparison module 20, so that the protection and recovery reference voltage values of the voltage comparison module are different, and the solution is solved.
  • the output state of the voltage comparison module is unstable, which leads to the unstable protection state of the intelligent power module, which causes the intelligent power module to drive the compressor uncontrollable, and finally leads to intelligent power.
  • the problem of module damage is because the input terminal of the voltage comparison module has fluctuations close to the reference voltage value.
  • FIG. 2 is a structural diagram of a circuit of a compressor protection circuit according to a second embodiment of the present invention.
  • the module structure diagram of the compressor protection circuit according to the first embodiment of the present invention is only shown for convenience of description.
  • the relevant parts of the embodiments of the present invention are specifically as follows:
  • the current sampling module 10 is mainly composed of a resistor RS1.
  • One end of the resistor RS1 is connected to the intelligent power module 60 to drive the lower arm switching tubes U, V, and W of the compressor 70 to the three-phase emitter output pins Iu, Iv, and Iw.
  • the pin output current is the three-phase current of the IPM module driving the compressor 70.
  • the connection point is simultaneously connected to the input end of the voltage comparison module 20.
  • the other end of the resistor RS1 is connected to the same potential, and the resistance RS1 is generally small.
  • a power resistor such as a milliohm-grade ceramic resistor, is used by the IPM module to drive the three-phase current of the compressor 70 to generate a voltage across the resistor RS1 to generate a sampled voltage signal.
  • the first comparator 21 of the voltage comparison module 20 is the first comparator IC1, the first input terminal of the voltage comparison module 20 is connected to the non-inverting input terminal of the first comparator IC1, and the second input terminal of the voltage comparison module 20 is connected to the first comparison. Inverting input of IC1.
  • the shaping module 80 includes a third resistor R4 and a first NPN transistor Q1;
  • the base of the first NPN transistor Q1 is the input end of the shaping module 80, the emitter of the first NPN transistor Q1 is grounded, and the common junction of the collector of the first NPN transistor Q1 and the third resistor R4 is the shaping module 22 At the output end, the other end of the third resistor R4 is connected to a DC power source.
  • the shaping module 80 may further include a tenth resistor R11.
  • One end of the tenth resistor R11 is connected to the base of the first NPN transistor Q1, and the other end of the tenth resistor R11 is grounded, that is, the tenth resistor R11 is connected across the first NPN transistor.
  • the first NPN transistor Q1 can be reliably turned off when the first comparator IC1 outputs a low level.
  • the shaping module 80 may further include an eleventh resistor R10. One end of the eleventh resistor R10 is connected to the base of the first NPN transistor Q1, and the other end is an input end of the shaping module 80 to replace the first NPN transistor.
  • the base of Q1 serves as the input of the shaping module 80.
  • the reference voltage module 30 is connected to the same input end of the first comparator IC1, the reference voltage module 30 provides a reference voltage for the voltage comparison module 20, and the reference voltage module 30 is composed of a twelfth resistor R2 and a thirteenth resistor R6, wherein the tenth One end of the two resistors R2 is connected to the DC power supply, the other end is connected to the thirteenth resistor R6, and the other end of the thirteenth resistor R6 is grounded, and the reference voltage signal is output from the connection point of the twelfth resistor R2 and the thirteenth resistor R6 and is connected to The non-inverting input terminal of the first comparator IC1;
  • the feedback module 40 includes a first resistor R1. One end of the first resistor R1 is an input end of the feedback module 40, and the other end of the first resistor R1 is an output end of the feedback module 40.
  • the intelligent power module 60 is an existing intelligent power module 60 including a controller and upper and lower arm switch tubes (ie, IPM, Intelligent) Power Module), where Iu, Iv, Iw are the U, V, W three-phase emitter output pins of the lower arm switch tube, and Cin is the fault and protection signal detection pin. When this pin has a high level signal, it is faulty. And the protection signal is valid, the intelligent power module 60 internally turns off the U, V, W three-phase pin output to close the load, where the U, V, W three-phase output pins are connected to the compressor 70, where the compressor 70 It is an inverter compressor; the F0 pin is a fault signal output pin.
  • IPM Intelligent Power Module
  • the F0 pin When the fault of the Cin pin and the protection signal are valid, the F0 pin outputs a valid fault signal;
  • the UP, VP, WP, UN, VN, and WN are upper and lower arm switch tube drive signal input pins, and the six drive signals are input to the smart power module 60 to cause the smart power module 60 to drive the compressor 70 to operate.
  • the MCU 50 is a signal processing chip, and includes a software algorithm program for driving the intelligent power module 60 to operate, so that the load compressor 70 operates according to the driving signal output by the MCU 50, wherein the output control pin is connected to the Cin pin of the intelligent power module 60, and the IPM module is fault detected.
  • the pin is connected to the F0 pin of the smart power module 60.
  • the three-phase current of the compressor 70 is normal.
  • the U, V, W three-phase emitter output pins Iu, Iv, Iw current of the lower arm switch tube of the intelligent power module 60 The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, and the first NPN transistor Q1 is turned on to output a low level to the Cin of the intelligent power module 60.
  • the smart power module works normally.
  • the reference voltage output by the reference voltage module 30 is the value of the ground voltage on the thirteenth resistor R6 after the twelfth resistor R2 is connected in series with the thirteenth resistor R6.
  • the comparator IC1 When the voltage on the resistor RS1 is greater than the reference voltage of the non-inverting input terminal of the first comparator IC1, the first time The comparator IC1 outputs a low level signal, that is, a compressor 70 phase current overshoot signal, and the low level signal is fed back to the non-inverting input terminal of the first comparator IC1 via the first resistor R1 of the feedback module 40, that is, the reference voltage module 30
  • the output terminal is connected to the first resistor IC1 and the first resistor R1 is connected to the first resistor R1.
  • the twelfth resistor R6 has a small resistance value, so the voltage value of the grounding voltage of the thirteenth resistor R6 and the first resistor R1 is lower than the voltage value of the single thirteenth resistor R6 when the original compressor is normally operated, that is, when it is compressed When the phase current of the machine increases, causing the first comparator IC1 to output a low level signal, the voltage value of the first input terminal of the voltage comparison module 20 is lowered.
  • the low level signal output by the first comparator IC1 causes the first NPN transistor Q1 to turn off the output high level to the Cin pin of the smart power module 60, and the intelligent power module 60 turns off the power according to the effective fault and protection signal.
  • Phase current output to control compressor 70 shutdown while at intelligent power module 60 The fault signal output pin F0 correspondingly outputs a level pulse fault signal to the MCU 50, and the MCU 50 stops outputting the 6 drive signals to the smart power module 60 according to the detected fault signal.
  • the increase in the voltage on the resistor RS1 is a continuous time course during which the voltage value is increased. It is not completely linearly increasing. It is a process in which the upper and lower fluctuations increase.
  • the voltage value is close to the reference voltage of the non-inverting input terminal of the first comparator IC1, if the reference voltage is constant, the fluctuation of the voltage value will be short.
  • the output state of the first comparator IC1 changes with the fluctuation of the input terminal, and the state of the output of the first comparator IC1 is unstable, resulting in the Cin pin of the smart power module 60 not being Stable, that is, the protection state of the intelligent power module 60 is unstable, so that the intelligent power module drives the compressor to be uncontrollable, and there may be an intelligent power module 60 that causes the phase current to be output to the compressor when the smart power module 60 or the compressor is faulty. Overcurrent damage.
  • the feedback module 40 of the present invention when the first comparator IC1 outputs a low level due to excessive phase current, the reference module of the first comparator IC1 is lowered by the feedback module 40, so that the first comparator IC1 is required.
  • the sampled voltage value on the resistor RS1 needs to be lower than the value of the reference voltage to be protected, that is, the voltage value of the protection and recovery of the first comparator IC1 is different, and the restored voltage is lower than the protected voltage value. Therefore, the above-mentioned frequent change of the output state of the first comparator IC1 due to the fluctuation of the sampled voltage value is avoided, and the protection state of the smart power module 60 is unstable, and the overcurrent damage is avoided.
  • a level pulse fault signal is output correspondingly, and a high level signal is output through the output control pin to the Cin pin of the smart power module 60, so that The intelligent power module 60 is in a continuous fault protection state, and the intelligent power module 60 continuously turns off its phase current output to control the compressor 70 to shut down.
  • This can further enable the intelligent power module 60 to not interfere with the output of the intelligent power module 60 by the MCU 50 during the fault protection, and the smart power module 60 falsely turns on the output current of the compressor due to interference on the compressor phase current, resulting in intelligent power. Module 60 is further damaged.
  • the phase current output by the smart power module 60 is lowered such that the sampled voltage value on the resistor RS1 is lowered below the voltage value recovered by the first comparator IC1, so that the first The comparator IC1 outputs a high level flip, so that the first NPN transistor Q1 is turned on and outputs a low level, and the MCU50 output control pin outputs a low level, so that the Cin pin of the smart power module 60 is at a low level, and the fault occurs.
  • the protection state is restored, and the MCU 50 outputs a drive signal to control the smart power module 60 to output a phase current to drive the compressor 70 to operate normally.
  • the first resistor R1 of the feedback module 40 reduces the reference voltage value decrease when the phase current outputted by the smart power module 60 is increased such that the first comparator IC1 is turned over to form a first comparator IC1 to protect and restore voltage inconsistency.
  • the phase current terminal outputted by the intelligent power module 60 may have strong interference, causing the voltage on the resistor RS1 to fluctuate, causing the first comparator IC1 to flip protection.
  • the reference voltage is unchanged, the state in which the output of the first comparator IC1 is unstable may cause the Cin pin of the smart power module 60 to be unstable, and finally cause the overcurrent damage of the smart power module 60, and the present invention is utilized.
  • the feedback module 40 is configured to prevent the first comparator IC1 from being inconsistent with the protection voltage, and the restored voltage is lower than the protection voltage value. By reasonably selecting the recovery voltage value, the first comparator IC1 can be turned over and protected when such interference occurs. And the protection can be restored when the interference is eliminated, thereby increasing the anti-interference ability of the compressor protection circuit. It makes the circuit more reliable.
  • the shaping module 80 may further include a fourth diode D1.
  • the anode of the fourth diode D1 is connected to the common contact of the collector of the first NPN transistor Q1 and the third resistor R4, and the fourth diode
  • the cathode of the tube D1 serves as an output of the shaping module 80 for its output isolation.
  • the MCU50 output control pin can also be connected to the Cin pin of the smart power module 60 through the fifth diode D2, which also serves as an output isolation.
  • the compressor protection circuit provided by the embodiment of the present invention adds the feedback module 40 by having the current sampling module 10, the voltage comparison module 20, the reference voltage module 30, the shaping module 80, the MCU 50, and the intelligent power module 60, because the feedback module 30 is connected to the voltage. Comparing the first input end and the output end of the module 20, the first input end is connected to the output end of the reference voltage module 30, and is fed back to the first input of the voltage comparison module 20 through the feedback module 30 when the voltage comparison module 20 outputs the protection signal. End, the voltage value of the first input terminal of the voltage comparison module 20 is lowered, thus changing the reference voltage value output by the reference voltage module 30 to the voltage comparison module 20, so that the voltage value of the voltage comparison module 20 is different from the protection and recovery, and is restored.
  • the voltage is lower than the voltage value of the protection, thus avoiding the interference of the sampling signal output by the current sampling module 10 or the fluctuation of the output voltage of the voltage comparison module 20 caused by the fluctuation of the reference voltage value, thereby causing the protection of the intelligent power module 60.
  • Unstable state causes intelligent power module to drive compressor uncontrollable final guide The problem of damage to the intelligent power module improves the operational reliability of the entire compressor protection circuit.
  • FIG. 3 is a circuit configuration diagram of a third embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in that the feedback module is different from the feedback module. 40, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the feedback module 40 includes a first diode D3; the cathode of the first diode D3 is an input end of the feedback module, and the anode of the first diode D3 is an output end of the feedback module.
  • the circuit structure of the feedback module 30 of FIG. 3 is different in that the first diode D3 is replaced with the first resistor R1.
  • the resistor The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, at which time the first diode D1 is turned off; when the phase current output by the smart power module 60 is increased.
  • the voltage on the resistor RS1 increases correspondingly, the first comparator IC1 is turned over to output a low level.
  • the first diode D3 is turned off, and the first comparator IC1 is pulled from the reference voltage of the non-inverting input terminal.
  • the first diode D3 is a silicon tube
  • its turn-on voltage is 0.7V.
  • the first comparator IC1 is pulled down from the reference voltage of the non-inverting input terminal to 0.7V, and the voltage is turned over by the first comparator IC1.
  • the former reference voltage value is low, and therefore the first comparator IC1 protects and restores the voltage inconsistency due to the conduction of the first diode D3, and other functions are not described again in the second embodiment.
  • FIG. 4 is a circuit configuration diagram of a compressor protection circuit according to a fourth embodiment of the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in that the feedback module is different from the feedback module. 40, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the feedback module 40 includes a second resistor R3 and a second diode D4; a cathode of the second diode D4 is an input end of the feedback module 40, an anode of the second diode D4 is connected to one end of the second resistor R3, and a second The other end of the resistor R3 is the output of the feedback module 40.
  • the resistor The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, and the second diode D4 is turned off; when the phase current output by the smart power module 60 is increased.
  • the voltage on the resistor RS1 increases correspondingly, the first comparator IC1 is turned over to output a low level.
  • the second diode D4 is turned off, and the first comparator IC1 is pulled from the reference voltage of the non-inverting input terminal.
  • the second diode D4 is a silicon tube
  • its turn-on voltage is 0.7V
  • the second resistor R3 the second resistor R3
  • the first comparator IC1 is pulled down from the non-inverting input terminal to a voltage slightly higher than 0.7V. a voltage value that is lower than a reference voltage value before the first comparator IC1 is turned over, so that the first comparator IC1 protects and restores the voltage from being inconsistent due to the conduction of the second diode D4, and the other functions are the same as the second implementation.
  • the examples will not be described again.
  • FIG. 5 is a circuit configuration diagram of a fifth embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 80, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the shaping module 80 includes a fourth resistor R3, a second NPN transistor Q2, and a third two NPN transistor Q3;
  • the base of the second NPN transistor is the input end of the shaping module 80, the emitter of the second NPN transistor Q2 is connected to the base of the third two NPN transistor Q3, the collector of the second NPN transistor Q2 and the third NPN transistor
  • the collector of Q3 and the common junction of one end of the fourth resistor are the output ends of the shaping module, the other end of the fourth resistor is connected to the DC power source, and the emitter of the third NPN transistor Q3 is grounded.
  • the present embodiment uses a composite tube composed of a second NPN transistor Q2 and a third two NPN transistor Q3 instead of the first NPN transistor Q1 of FIG. 2, and the working principle is the same, and will not be described again.
  • the shaping module 80 may further include a fourteenth resistor R7, a fifteenth resistor R16, and a sixth diode D5, and functions as the tenth resistor R11, the eleventh resistor R10, and the fourth diode D1 in FIG.
  • the shaping module 80 can also have other circuit structures, as shown in FIG. 6, its shaping module 80 includes a fifth resistor R12, a fourth NPN transistor Q4 and a fifth PNP transistor Q5;
  • the base of the fourth NPN transistor Q4 is at the input end of the shaping module 80, the collector of the fourth NPN transistor Q4 is connected to the base of the fifth PNP transistor Q5, and the emitter of the fifth PNP transistor Q5 is connected to the end of the fifth resistor.
  • the common contact is the output end of the shaping module 80, the other end of the fifth resistor is connected to the DC power source, and the emitter of the third NPN transistor Q4 is grounded.
  • the present embodiment uses a composite tube composed of a fourth NPN transistor Q4 and a fifth PNP transistor Q5 instead of the first NPN transistor Q1 of FIG. 2, and the working principle is the same, and will not be described again.
  • the module 80 may further include a fifteenth resistor R8, a sixteenth resistor R17 and a seventh diode D6, and functions as the tenth resistor R11, the eleventh resistor R10 and the fourth diode D1 in FIG.
  • FIG. 1 Another circuit structure of the shaping module 80 is shown in FIG. 1
  • the shaping module 80 includes a sixth resistor R10 and a sixth PNP transistor Q6;
  • the base of the sixth PNP type transistor Q6 is the input end of the shaping module 80, the emitter of the sixth PNP type transistor Q6 is connected to the DC power source, and the common point of the collector of the sixth PNP type transistor Q6 and the sixth resistor is the shaping module 80. At the output end, the other end of the sixth resistor is connected to the ground.
  • the first comparator IC1 When the smart power module 60 and the compressor 70 are working normally, the first comparator IC1 outputs a high level such that the sixth PNP-type transistor Q6 is turned off to output a low level to the Cin pin of the smart power module 60; when the smart power module 60 outputs When the phase current increases, the first comparator IC1 inverts and outputs a low level, so that the sixth PNP type transistor Q6 is turned on to output a high level to the Cin pin of the smart power module 60.
  • the shaping module 80 may further include a seventeenth resistor R20 and an eighth diode D7 having the same function as the eleventh resistor R10 and the fourth diode D1 of FIG.
  • FIG. 8 is a circuit structural diagram of a sixth embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in voltage comparison.
  • the module 20 further includes an eighth resistor R18. One end of the eighth resistor is connected to the output of the voltage comparison module 20, and the other end is connected to the DC power source VCC.
  • the second comparator IC2 in FIG. 8 may be different from the first comparator IC1 model in FIG. 2.
  • the second comparator IC2 may use an internal output transistor open collector output type comparator, which cannot directly output a high level by itself. It needs to be pulled up to the VCC output high level through the eighth resistor R18; and the output of the first comparator IC1 has no pull-up resistor similar to the eighth resistor R18, and the first comparator IC1 must adopt the internal output transistor push-pull Output type, which must be able to output a high level by itself.
  • the second comparator IC2 can also adopt an internal output transistor push-pull output type comparator, so that the comparator can be adapted to a wider range of comparator types by the pull-up eighth resistor R18.
  • the shaping module 80 further includes a ninth resistor R19.
  • One end of the ninth resistor R19 is connected to the base of the first NPN transistor, and the other end is connected to a DC power source.
  • the ninth resistor R19 can also perform a pull-up function on the output end of the voltage comparison module 20.
  • the adaptation type of the third comparator IC3 of the voltage comparison module 20 is made wider.
  • the compressor protection circuit further includes a temperature protection module 90 and a temperature protection module.
  • the input end of 90 is connected to the intelligent power module 60, and the output end of the temperature protection module 90 is connected to the second input end of the voltage comparison module 20;
  • the smart power module 60 When the temperature of the smart power module 60 is too high, the smart power module 60 outputs a temperature protection signal to the second input end of the voltage comparison module 20 through the temperature protection module 90, so that the voltage comparison module 20 outputs the protection signal to the smart power module 60, and the smart The power mode 60 blocks the output phase current according to the protection signal to stop the compressor 70 from operating.
  • FIG. 11 is a circuit configuration diagram of the temperature protection module 90 of the present invention, the temperature protection module 90 includes a sixth resistor R14, a seventh resistor R15, and a third diode D8;
  • One end of the sixth resistor R14 is an input end of the temperature protection module 90, the other end of the sixth resistor R14 is connected to one end of the seventh resistor R15 to the anode of the third diode D8, and the cathode of the third diode D8 is At the output of the temperature protection module 90, the other end of the seventh resistor R15 is grounded.
  • the intelligent power module 60 used in the embodiment of the present invention is an intelligent power module with a temperature signal output function, which detects the internal temperature of the intelligent power module 60, and outputs a signal reflecting the temperature through the TO pin of the intelligent power module 60 in FIG. If the different internal voltages of the smart power module 60 are reflected by different voltage values, when the operating current of the compressor is too high, the phase current output by the smart power module 60 is too large, and the temperature rise of the body of the smart power module 60 increases rapidly. At this time, if the effective protection is not obtained, the module is easily damaged.
  • the voltage signal of the TO power output of the intelligent power module 60 reflects the temperature and generates a voltage value of a suitable voltage range through the voltage dividing circuit constituting the sixth resistor R14 and the seventh resistor R15, and outputs the voltage value to the voltage comparison module 20 through the third diode D8.
  • the interference signal is generated on the Iw to the inverting input terminal of the first comparator IC1, and finally causes the TO pin of the intelligent power module 60 to be damaged; when the temperature of the smart power module 60 is too high, the output voltage signal of the TO pin is raised, and finally
  • the first comparator IC1 outputs a low-level signal, that is, the compressor 70 phase current excessive signal, and other working principles and figures The same is shown in 2, so it will not be described again.
  • the change of the voltage signal value of the TO pin output reflecting the temperature also has a process, and is also a process of increasing the fluctuation, in which the voltage signal value is close to the non-inverting input of IC1.
  • the terminal reference voltage value is similar to the compressor phase current over-protection process in the second embodiment, if the reference voltage is constant, the state of the output of the first comparator IC1 is also unstable, and the feedback module of the present invention is added.
  • the first comparator IC1 inverts the output protection signal
  • the feedback voltage of the non-inverting input terminal of the IC1 is lowered by the feedback module, so that only the temperature of the body of the next smart power module 60 is lowered, so that the TO pin outputs a voltage signal value reflecting the temperature.
  • the first comparator IC1 can flip the recovery protection signal. Therefore, the addition of the feedback module 40 also overcomes the temperature rise of the smart power module 60, causing the state of the output of the first comparator IC1 to be unstable. Finally, the protection state of the smart power module 60 is unstable, causing damage thereto, so that the smart power module 60 is more protected. reliable.
  • FIG. 12 is a structural diagram of an application circuit related to the complete compressor control of the compressor protection circuit of the present invention based on FIG. 11, and its working principle is as follows:
  • Diode D9-D12 constitutes the rectifier circuit of the AC input terminal, rectifies the AC input voltage and converts it into DC ripple voltage.
  • L, D13 and C2 form a passive PFC circuit, and correct the DC ripple voltage output by the rectifier circuit.
  • C3 is The large-capacity high-voltage filter capacitor smoothly filters the DC ripple voltage into a stable DC voltage, and provides the DC power supply for the intelligent power module IC3.
  • the intelligent power module IC3 outputs U, V, W three-phase current-driven inverter compressors. M work.
  • the intelligent power module IC3 includes an upper bridge IGBT composed of S1, S3, and S5 (Insulated Gate Bipolar) Transistor) switch tube and S2, S4, S6 lower arm IGBT switch tube and controller; the controller is HVIC (High Voltage Integrated Circuit) high voltage integrated circuit and LVIC (Low Voltage Integrated) Circuit) is a low-voltage integrated circuit, HVIC is used to drive the upper bridge IGBT switch tube, LVIC is used to drive the lower bridge IGBT switch tube and includes related control and status signal pins, including fault signal output pin F0, fault and protection signal The detection pin Cin, the intelligent power module internal temperature detection signal output pin TO, and the U, V, W three-phase emitter output pins Iu, Iv, Iw of the lower arm switch tube.
  • HVIC High Voltage Integrated Circuit
  • LVIC Low Voltage Integrated Circuit
  • MCU IC4 is a signal processing chip, which contains the software algorithm program for driving the intelligent power module IC3 and its state detection, the status detection related program of the inverter compressor M, etc.; the P3-P7 six pins of the MCU are respectively connected to the intelligent power module IC5.
  • the Wn, Vn, Un, Wp, Vp, and Up input pins are connected to the LVIC and HVIC to drive the IGBT switch of the upper and lower arms through the LVIC and HVIC.
  • the other part of the circuit and the circuit including the current sampling module, the voltage comparison module, the shaping module, the reference voltage module, and the feedback module shown in FIG. 11 have the same working principle as that of FIG. 11 and will not be further described herein.
  • the present invention also provides an air conditioner, including the above-mentioned compressor protection circuit, and the air conditioner thereof is an inverter air conditioner.
  • an air conditioner including the above-mentioned compressor protection circuit, and the air conditioner thereof is an inverter air conditioner.

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Abstract

一种压缩机保护电路和空调器，通过在具有电流采样模块（10）、参考电压模块（30）、电压比较模块（20）、整形模块（80）、MCU（50）及智能功率模块（60）上增加反馈模块（40），由于反馈模块（40）连接在电压比较模块（20）的参考电压输入端和输出端，使得电压比较模块（20）的保护和恢复的参考电压值不同。解决了由于电压比较模块（20）的输入端存在与参考电压值接近的波动引起电压比较模块（20）的输出状态不稳定，进而导致智能功率模块（60）的保护状态不稳定引起智能功率模块（60）驱动压缩机不可控，最后导致智能功率模块（60）损坏的问题。

Description

压缩机保护电路和空调器
技术领域
本发明涉及压缩机保护电路领域，尤其涉及一种压缩机保护电路和空调器。
背景技术
目前，变频空调的室外压缩机的驱动方案通常是通过对交流电源整流滤波后得到直流母线电源，该直流母线电源经过功率因数校正电路进行功率因素校正处理后，再向智能功率模块供电，最后由智能功率模块直接驱动压缩机工作，同时，变频空调中的MCU输出驱动信号以使智能功率模块按照相应的相电流驱动压缩机工作。
为了对压缩机进行过流保护，现有技术会提供一种压缩机电流保护电路，其通过对压缩机的相电流进行采样，通过将采用的电流大小转换成采样电压信号输入到第一比较器，并与参考电压值比较，当压缩机发生过流使得采样电压信号升高导致第一比较器输出翻转以输出保护信号，以控制智能功率模块输出关闭，使得在压缩机的相电流过大时使智能功率模块关断其相电流输出以达到保护压缩机的目的。在实际使用中会遇到以下问题：由于压缩机电流的增加是一个连续变化的时间过程，导致电压采样信号在接近参考电压值时存在一个波动时间，即采样电压值的大小存在与参考电压相同或微小差别的一个临界值，采样电压值会在一段时间内在参考电压值左右波动，因此在此时间段内导致第一比较器的输出状态不稳定，进而导致智能功率模块的保护状态不稳定；或者由于压缩机的相电流上存在干扰信号，也会导致采样电压值在短时间内低于或者高于参考电压值，同样导致智能功率模块的保护状态不稳定，而智能功率模块的保护状态不稳定会导致智能功率模块驱动压缩机不可控，存在智能功率模块损坏的问题。
发明内容
本发明的主要目的在于提供一种压缩机保护电路和空调器，目的在于解决压缩机过流保护电路过程中存在保护状态不稳定导致智能功率模块驱动压缩机不可控引起智能功率模块损坏的问题。
为实现上述目的，本发明提供的一种压缩机保护电路，所述压缩机保护电路包括电流采样模块、电压比较模块、参考电压模块、整形模块、MCU及智能功率模块；所述智能功率模块根据所述MCU所输出的驱动信号输出相电流以驱动压缩机运行；所述参考电压模块生成参考电压输出到所述电压比较模块的第一输入端；所述电流采样模块对压缩机的相电流进行采样并输出相应的采样电压信号至所述电压比较模块的第二输入端；所述电压比较模块将所述采样电压信号与所述参考电压信号进行比较，并在所述采样电压信号大于所述参考电压信号时，输出保护信号经所述整形模块整形至所述智能功率模块；所述智能功率模块根据所述保护信号关断输出相电流以停止压缩机运行，同时输出故障保护信号以使所述MCU停止输出所述驱动信号；其特征在于，所述压缩机保护电路还包括：
反馈模块，输入端与所述电压比较模块的输出端连接，输出端与所述电压比较模块的第一输入端连接；当所述电压比较模块在压缩机相电流过大超过预设值输出保护信号时，将所述电压比较模块输出的保护信号反馈至所述电压比较模块的第一输入端，使得所述电压比较模块第一输入端的电压值降低。
优选的，所述电压比较模块包括第一比较器；
所述电压比较模块的第一输入端连接所述第一比较器的同相输入端，所述电压比较模块的第二输入端连接所述第一比较器的反向相输入端。
优选的，所述反馈模块包括第一电阻；
所述第一电阻的一端为反馈模块的输入端，所述第一电阻的另一端为反馈模块的输出端。
优选的，所述反馈模块包括第一二极管；
所述第一二极管的阴极为反馈模块的输入端，所述第一二极管的阳极为反馈模块的输出端。
优选的，所述反馈模块包括第二电阻和第二二极管；
所述第二二极管的阴极为所述反馈模块的输入端，所述第二二极管的阳极连接所述第二电阻的一端，所述第二电阻的另一端为所述反馈模块的输出端。
优选的，所述整形模块包括第三电阻和第一NPN三极管；
所述第一NPN型三极管的基极为所述整形模块的输入端，所述第一NPN型三极管的发射极接地，所述第一NPN型三极管的集电极与所述第三电阻一端的共接点为所述整形模块的输出端，所述第三电阻另一端接直流电源。
优选的，所述整形模块包括第四电阻、第二NPN三极管和第三NPN三极管；
所述第二NPN型三极管的基极为所述整形模块的输入端，所述第二NPN型三极管的发射极连接所述第三NPN三极管的基极，所述第二NPN型三极管的集电极与所述第三NPN型三极管的集电极以及第四电阻一端的共接点为所述整形模块的输出端，所述第四电阻另一端连接直流电源，所述第三NPN型三极管的发射极接地。
优选的，所述整形模块包括第五电阻、第四NPN三极管和第五PNP三极管；
所述第四NPN型三极管的基极为所述整形模块的输入端，所述第四NPN型三极管的集电极连接所述第五PNP三极管的基极，所述第五PNP型三极管的发射极与第五电阻一端的共接点为所述整形模块的输出端，所述第五电阻另一端连接直流电源，所述第四NPN型三极管的发射极接地。
优选的，所述整形模块包括第六电阻和第六PNP三极管；
所述第六PNP型三极管的基极为所述整形模块的输入端，所述第六PNP型三极管的发射极接直流电源，所述第六PNP型三极管的集电极与所述第六电阻一端的共接点为所述整形模块的输出端，所述第六电阻另一端连接地。
优选的，所述压缩机保护电路还包括温度保护模块，所述温度保护模块的输入端连接所述智能功率模块，所述温度保护模块的输出端连接所述电压比较模块的第二输入端；
当所述智能功率模块温度过高时，智能功率模块通过温度保护模块输出温度保护信号到所述电压比较模块的第二输入端，以使所述电压比较模块输出保护信号到所述智能功率模块，所述智能功率模块根据所述保护信号关断输出相电流以停止所述压缩机运行。
优选的，所述温度保护模块包括第六电阻、第七电阻和第三二极管；
所述第六电阻的一端为所述温度保护模块的输入端，所述第六电阻的另一端与所述第七电阻的一端共接于所述第三二极管的阳极，所述第三二极管的阴极为所述温度保护模块的输出端，所述第七电阻的另一端接地。
优选的，所述电压比较模块还包括第八电阻，所述第八电阻一端连接所述第一比较器的输出端，另一端连接直流电源。
优选的，所述整形模块还包括第九电阻，所述第九电阻一端连接第一NPN型三极管基极，另一端连接直流电源。
为实现上述目的，本发明还提供一种空调器，包括所述的压缩机保护电路。
本发明提供的压缩机保护电路通过在具有电流采样模块、参考电压模块、电压比较模块、整形模块、MCU及智能功率模块上增加反馈模块，由于反馈模块连接在电压比较模块的参考电压输入端和输出端，使得电压比较模块的保护和恢复的参考电压值不同。解决了由于电压比较模块的输入端存在与参考电压值接近的波动引起电压比较模块的输出状态不稳定，进而导致智能功率模块的保护状态不稳定引起智能功率模块驱动压缩机不可控，最后导致智能功率模块损坏的问题。
附图说明
图1为本发明压缩机保护电路第一实施例的模块结构示意图；
图2为本发明压缩机保护电路第二实施例的电路结构图；
图3为本发明压缩机保护电路第三实施例的电路结构图；
图4为本发明压缩机保护电路第四实施例的电路结构图；
图5为本发明压缩机保护电路第五实施例的电路结构图；
图6为本发明压缩机保护电路第五实施例的另一电路结构图；
图7为本发明压缩机保护电路第五实施例的另一电路结构图；
图8为本发明压缩机保护电路第六实施例的电路结构图；
图9为本发明压缩机保护电路第六实施例的另一电路结构图；
图10为本发明压缩机保护电路第七实施例的模块结构示意图；
图11为本发明压缩机保护电路第七实施例的电路结构图；
图12为本发明压缩机保护电路第七实施例的另一电路结构图。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
参照图1，图1为本发明第一实施例提供的压缩机保护电路的模块结构图，为了便于说明，仅示出了与本发明实施例相关的部分，详述如下：
本发明实施例提供的压缩机保护电路包括电流采样模块10、电压比较模块20、参考电压模块30、整形模块80、MCU50及智能功率模块70；智能功率模块70根据MCU50所输出的驱动信号输出相电流以驱动压缩机运行；参考电压模块30生成参考电压输出到电压比较模块20的第一输入端；电流采样模块10对压缩机的相电流进行采样并输出相应的采样电压信号至电压比较模块20的第二输入端；电压比较模块20将采样电压信号与参考电压信号进行比较，在采样电压信号大于参考电压信号时，输出保护信号经整形模块80至智能功率模块70；智能功率模块70根据保护信号关断输出相电流以停止压缩机运行，同时输出故障保护信号以使MCU50停止输出驱动信号；压缩机保护电路还包括：
反馈模块40，输入端与电压比较模块20的输出端连接，输出端与电压比较模块20的第一输入端连接；当电压比较模块20在压缩机相电流过大超过预设值输出保护信号时，将电压比较模块20输出的保护信号反馈至电压比较模块20的第一输入端，使得电压比较模块20第一输入端电压值降低。
本发明实施例提供的压缩机保护电路通过在具有电流采样模块10、电压比较模块20、参考电压模块30、整形模块80、MCU50及智能功率模块60增加反馈模块40，由于反馈模块30连接在电压比较模块20的第一输入端和输出端，而第一输入端与参考电压模块30输出端连接，当电压比较模块20输出的保护信号时通过反馈模块30反馈至电压比较模块20的第一输入端，使得电压比较模块20第一输入端电压值降低，因此改变了参考电压模块30输出到电压比较模块20的参考电压值，以此使得电压比较模块的保护和恢复的参考电压值不同，解决了由于电压比较模块的输入端存在与参考电压值接近的波动引起电压比较模块的输出状态不稳定，进而导致智能功率模块的保护状态不稳定引起智能功率模块驱动压缩机不可控，最后导致智能功率模块损坏的问题。
参照图2，图2为本发明第二实施例提供的压缩机保护电路电路结构图，基于本发明第一实施例提供的压缩机保护电路的模块结构图，为了便于说明，仅示出了与本发明实施例相关的部分，具体如下：
电流采样模块10主要基于电阻RS1组成，电阻RS1的一端连接智能功率模块60驱动压缩机70内部的下桥臂开关管U、V、W三相的发射极输出脚Iu、Iv、Iw，这三个引脚输出电流为IPM模块驱动压缩机70的三相电流，此连接点同时连接到电压比较模块20的输入端，电阻RS1的另一端接等电势地，电阻RS1一般为小阻值的大功率电阻，如毫欧级的陶瓷电阻，以供IPM模块驱动压缩机70的三相电流在电阻RS1上产生电压，以生成采样电压信号。
电压比较模块20的第一比较器21为第一比较器IC1，电压比较模块20的第一输入端连接第一比较器IC1的同相输入端，电压比较模块20的第二输入端连接第一比较器IC1的反相输入端。
整形模块80包括第三电阻R4和第一NPN三极管Q1；
第一NPN型三极管Q1的基极为整形模块80的输入端，第一NPN型三极管Q1的发射极接地，第一NPN型三极管Q1的集电极与第三电阻R4一端的共接点为整形模块22的输出端，第三电阻R4另一端接直流电源。
整形模块80还可以包括第十电阻R11，第十电阻R11的一端连接第一NPN型三极管Q1的基极，第十电阻R11的另一端接地，即第十电阻R11跨接在第一NPN型三极管Q1的基极和发射极上，起到第一NPN型三极管Q1在第一比较器IC1输出低电平时能可靠截止作用。
整形模块80还可以包括第十一电阻R10，第十一电阻R10的一端连接第一NPN型三极管Q1的基极，此时另一端为整形模块80的输入端，以替换上述第一NPN型三极管Q1的基极做为整形模块80的输入端。
参考电压模块30连接到第一比较器IC1的同输入端，参考电压模块30为电压比较模块20提供参考电压，参考电压模块30由第十二电阻R2、第十三电阻R6组成，其中第十二电阻R2的一端连接到直流电源，另一端连接第十三电阻R6，第十三电阻R6另一端接地，从第十二电阻R2和第十三电阻R6的连接点输出参考电压信号并连接到第一比较器IC1的同相输入端；
反馈模块40包括第一电阻R1，第一电阻R1的一端为反馈模块40的输入端，所述第一电阻R1的另一端为反馈模块40的输出端。
智能功率模块60为现有的包含控制器和上下桥臂开关管的智能功率模块60（即IPM，Intelligent Power Module），其中Iu、Iv、Iw为下桥臂开关管的U、V、W三相的发射极输出脚，Cin为故障和保护信号检测脚，当此引脚出现高电平信号时其故障和保护信号有效，智能功率模块60内部会关断U、V、W三相引脚额输出以关闭负载，在这里U、V、W三相输出脚连接到压缩机70，这里的压缩机70为变频压缩机；F0引脚为故障信号输出脚，当Cin引脚的故障和保护信号有效时，F0引脚输出有效的故障信号； UP、VP、WP、UN、VN、WN为上下桥臂开关管驱动信号输入脚，通过这6个驱动信号输入到智能功率模块60以使得智能功率模块60驱动压缩机70工作。
MCU50为信号处理芯片，包含了驱动智能功率模块60工作的软件算法程序，使得负载压缩机70按照MCU50输出的驱动信号运行，其中输出控制脚连接智能功率模块60的Cin引脚，IPM模块故障检测脚连接到智能功率模块60的F0引脚。
以下结合图2对此压缩机保护电路的工作原理作进一步说明：
当压缩机70工作正常时，其驱动压缩机70的三相电流大小正常，此时智能功率模块60下桥臂开关管的U、V、W三相的发射极输出脚Iu、Iv、Iw电流在RS上的电压小于第一比较器IC1由同相输入端的参考电压，此时第一比较器IC1输出高电平，第一NPN型三极管Q1导通输出低电平到智能功率模块60的Cin引脚，智能功率模块正常工作，此时参考电压模块30输出的参考电压是由第十二电阻R2串联第十三电阻R6分压后在第十三电阻R6上的对地电压值。
当由于压缩机70本体的故障或智能功率模块60内部故障导致压缩机70的工作电流增大即智能功率模块60输出的相电流增大时，其下桥臂开关管的U、V、W三相的发射极输出脚Iu、Iv、Iw电流对应增大，其电阻RS1上的电压对应增大，当电阻RS1上的电压大于第一比较器IC1的同相输入端的参考电压时，此时第一比较器IC1输出低电平信号即压缩机70相电流过大信号，此低电平信号经反馈模块40的第一电阻R1反馈到第一比较器IC1的同相输入端，即参考电压模块30的输出端，由于第一电阻R1连接第一比较器IC1输出的一端为低电平，此时第十三电阻R6和第一电阻R1形成并联关系，因此参考电压模块30输出的参考电压是由第十三电阻R6与第一电阻R1并联再与第十一电阻R2串联分压后，在第十三电阻R6与第一电阻R1并联端的对地电压值，由于第十三电阻R6与第一电阻R1并联的阻值比单个的第十二电阻R6阻值小，因此第十三电阻R6与第一电阻R1并联端的对地电压值比原来压缩机正常工作时单个第十三电阻R6上的电压值低，即当由于压缩机的相电流增大导致第一比较器IC1输出低电平信号时，使得电压比较模块20第一输入端电压值降低。
同时，第一比较器IC1输出的低电平信号使得第一NPN型三极管Q1截止输出高电平到智能功率模块60的Cin引脚，智能功率模块60根据有效的故障和保护信号随即关断其相电流输出以控制压缩机70停机，同时在智能功率模块60 的故障信号输出脚F0会对应输出一个电平脉冲故障信号到MCU50，MCU50根据检测到的故障信号停止输出其6个到智能功率模块60的驱动信号。
在以上智能功率模块60输出的相电流增大使得电阻RS1上的采样电压值对应增大过程中，由于电阻RS1上的电压的增大是一个连续的时间过程，此期间其电压值的增大并不是完全线性增大的，是一个上下波动增大的过程，在此电压值接近第一比较器IC1的同相输入端的参考电压时，如果参考电压不变，则其电压值的波动会存在短时间大于或者小于参考电压值的情况，此时会第一比较器IC1的输出状态随着输入端的波动发生改变，第一比较器IC1的输出的状态不稳定导致智能功率模块60的Cin引脚不稳定，即智能功率模块60保护状态不稳定，进而使得致智能功率模块驱动压缩机不可控，会存在在智能功率模块60或者压缩机存在故障情况下仍对压缩机输出相电流导致智能功率模块60过流损坏。而利用本发明的反馈模块40，在由于相电流过大第一比较器IC1输出低电平时，经反馈模块40使得第一比较器IC1的同相输入端的参考电压降低，使得第一比较器IC1要恢复保护时，需要此时电阻RS1上的采样电压值比发生保护的参考电压值更低，即第一比较器IC1发生保护和恢复的电压值不同，且恢复的电压比保护的电压值低，因此避免了上述由于此采样电压值的波动引起第一比较器IC1的输出状态的频繁改变导致智能功率模块60保护状态不稳定，避免了其过流损坏。
进一步的，在MCU50接收到智能功率模块60的故障信号输出脚F0会对应输出一个电平脉冲故障信号后，会通过其输出控制脚输出高电平信号到智能功率模块60的Cin引脚，使得智能功率模块60处于持续的故障保护状态，智能功率模块60持续关断其相电流输出以控制压缩机70停机。这样能够进一步使得智能功率模块60在故障保护期间不会由于被MCU50输出到智能功率模块60存在干扰，以及压缩机相电流上存在干扰导致智能功率模块60误开通对压缩机输出电流而导致智能功率模块60进一步损坏。
在压缩机70的相关电路正常工作或者压缩机70故障排除后，智能功率模块60输出的相电流降低使得电阻RS1上的采样电压值降低到第一比较器IC1恢复的电压值以下，使得第一比较器IC1输出高电平翻转，进而使得第一NPN型三极管Q1导通输出低电平，同时MCU50输出控制脚输出低电平，使得智能功率模块60的Cin引脚为低电平，其故障保护状态恢复，MCU50输出驱动信号控制智能功率模块60输出相电流以驱动压缩机70正常运行。
上述反馈模块40的第一电阻R1除在智能功率模块60输出的相电流增大使得第一比较器IC1翻转保护时降低其参考电压值降低，以形成第一比较器IC1保护和恢复电压不一致使得智能功率模块60可靠保护外，在压缩机70工作正常时，其智能功率模块60输出的相电流端可能存强干扰，导致电阻RS1上的电压发生波动，引起第一比较器IC1发生翻转保护，此时如果其参考电压不变，同理会存在第一比较器IC1的输出的状态不稳定导致智能功率模块60的Cin引脚不稳定进而最后引起智能功率模块60过流损坏，而利用本发明的反馈模块40，使得第一比较器IC1保护和恢复电压不一致，且恢复的电压比保护的电压值低，通过合理的选择恢复电压值，能保证这样干扰到来时引起第一比较器IC1发生翻转保护，而在干扰消除时才能使得保护恢复，从而增加了此压缩机保护电路的抗干扰能力，使得电路工作更加可靠。
本实施例中，整形模块80还可以包括第四二极管D1，第四二极管D1的阳极接第一NPN型三极管Q1的集电极与第三电阻R4一端的共接点，第四二极管D1的阴极作为整形模块80的输出端，起到其输出隔离作用。
MCU50输出控制脚还可以通过第五二极管D2连接到智能功率模块60的Cin引脚，同样起到输出隔离作用。
本发明实施例提供的压缩机保护电路通过在具有电流采样模块10、电压比较模块20、参考电压模块30、整形模块80、MCU50及智能功率模块60增加反馈模块40，由于反馈模块30连接在电压比较模块20的第一输入端和输出端，而第一输入端与参考电压模块30输出端连接，当电压比较模块20输出的保护信号时通过反馈模块30反馈至电压比较模块20的第一输入端，使得电压比较模块20第一输入端电压值降低，因此改变了参考电压模块30输出到电压比较模块20的参考电压值，使得电压比较模块20发生保护和恢复的电压值不同，且恢复的电压比保护的电压值低，因此避免了由于电流采样模块10输出的采样信号存在干扰或者存在与参考电压值接近的波动引起电压比较模块20的输出状态不稳定，进而导致智能功率模块60的保护状态不稳定引起智能功率模块驱动压缩机不可控最后导致智能功率模块损坏的问题，提高了整个压缩机保护电路的工作可靠性。
参照图3，图3为本发明压缩机保护电路第三实施例的电路结构图，基于本发明压缩机保护电路第一实施例，相对图2的压缩机保护电路，其不同之处在于反馈模块40，其他模块均与图2所示的相同，因此不再赘述。
反馈模块40包括第一二极管D3；第一二极管D3的阴极为反馈模块的输入端，第一二极管D3的阳极为反馈模块的输出端。相对图3的反馈模块30的电路结构，其不同之处在于将第一二极管D3替换为第一电阻R1。
当智能功率模块60和压缩机70工作正常时，电阻 RS上的电压小于第一比较器IC1由同相输入端的参考电压，此时第一比较器IC1输出高电平，此时第一二极管D1截止；当智能功率模块60输出的相电流增大时，其电阻RS1上的电压对应增大，最后导致第一比较器IC1翻转输出低电平，此时第一二极管D3截止导通，将第一比较器IC1由同相输入端的参考电压拉低，如第一二极管D3为硅管时，其导通电压为0.7V，此时第一比较器IC1由同相输入端的参考电压拉低到0.7V，此电压比第一比较器IC1翻转前的参考电压值低，因此由于第一二极管D3的导通使得第一比较器IC1保护和恢复电压不一致，其他功能同第二实施例不再赘述。
参照图4，图4为本发明压缩机保护电路第四实施例的电路结构图，基于本发明压缩机保护电路第一实施例，相对图2的压缩机保护电路，其不同之处在于反馈模块40，其他模块均与图2所示的相同，因此不再赘述。
反馈模块40包括第二电阻R3和第二二极管D4；第二二极管D4的阴极为反馈模块40的输入端，第二二极管D4的阳极连接第二电阻R3的一端，第二电阻R3的另一端为反馈模块40的输出端。
同第三实施例原理类似，当智能功率模块60和压缩机70工作正常时，电阻 RS上的电压小于第一比较器IC1由同相输入端的参考电压，此时第一比较器IC1输出高电平，此时第二二极管D4截止；当智能功率模块60输出的相电流增大时，其电阻RS1上的电压对应增大，最后导致第一比较器IC1翻转输出低电平，此时第二二极管D4截止导通，将第一比较器IC1由同相输入端的参考电压拉低，如第二二极管D4为硅管时，其导通电压为0.7V，再经第二电阻R3限流此时第一比较器IC1由同相输入端的参考电压拉低到0.7V稍高一的电压值，此电压比第一比较器IC1翻转前的参考电压值低，因此由于第二二极管D4的导通使得第一比较器IC1保护和恢复电压不一致，其他功能同第二实施例不再赘述。
参照图5，图5为本发明压缩机保护电路第五实施例的电路结构图，基于本发明压缩机保护电路第一实施例，相对图2的压缩机保护电路，其不同之处在于整形模块80，其他模块均与图2所示的相同，因此不再赘述。
整形模块80包括第四电阻R3、第二NPN三极管Q2和第三二NPN三极管Q3；
第二NPN型三极管的基极为整形模块80的输入端，第二NPN型三极管Q2的发射极连接第三二NPN三极管Q3的基极，第二NPN型三极管Q2的集电极与第三NPN型三极管Q3的集电极以及第四电阻一端的共接点为整形模块的输出端，第四电阻另一端连接直流电源，第三NPN型三极管Q3的发射极接地。
相比图2的整形模块80，本实施例采用由第二NPN三极管Q2和第三二NPN三极管Q3组成的复合管替代图2的第一NPN三极管Q1，工作原理与之相同，不再赘述，整形模块80还可以包括第十四电阻R7、第十五电阻R16以及第六二极管D5，功能同图2中的第十电阻R11、第十一电阻R10和第四二极管D1。
整形模块80还可以有其他电路结构，如图6所示的其整形模块80包括第五电阻R12、第四NPN三极管Q4和第五PNP三极管Q5；
第四NPN型三极管Q4的基极为整形模块80的输入端，第四NPN型三极管Q4的集电极连接第五PNP三极管Q5的基极，第五PNP型三极管Q5的发射极与第五电阻一端的共接点为整形模块80的输出端，第五电阻另一端连接直流电源，第三NPN型三极管Q4的发射极接地。
相比图2的整形模块80，本实施例采用由第四NPN三极管Q4和第五PNP三极管Q5组成的复合管替代图2的第一NPN三极管Q1，工作原理与之相同，不再赘述，整形模块80还可以包括第十五电阻R8、第十六电阻R17和第七二极管D6，功能同图2中的第十电阻R11、第十一电阻R10和第四二极管D1。
整形模块80的另外一种电路结构如图7所示。
其整形模块80包括第六电阻R10和第六PNP三极管Q6；
第六PNP型三极管Q6的基极为整形模块80的输入端，第六PNP型三极管Q6的发射极接直流电源，第六PNP型三极管Q6的集电极与第六电阻一端的共接点为整形模块80的输出端，第六电阻另一端连接地。
当智能功率模块60和压缩机70工作正常时，第一比较器IC1输出高电平使得第六PNP型三极管Q6截止输出低电平到智能功率模块60的Cin脚；当智能功率模块60输出的相电流增大时，第一比较器IC1翻转输出低电平，使得第六PNP型三极管Q6导通输出高电平到智能功率模块60的Cin脚。
整形模块80还可以包括第十七电阻R20和第八二极管D7，功能同图2中第十一电阻R10和第四二极管D1。
参照图8，图8为本发明压缩机保护电路第六实施例的电路结构图，基于本发明压缩机保护电路第一实施例，相对于图2的压缩机保护电路，不同之处在于电压比较模块20还包括第八电阻R18，第八电阻一端连接电压比较模块20的输出端，另一端连接直流电源VCC。
图8中的第二比较器IC2与图2中的第一比较器IC1型号可以不同，第二比较器IC2可以采用内部输出三极管集电极开路输出型的比较器，其自身不能直接输出高电平，需要通过第八电阻R18上拉到VCC输出高电平；而第一比较器IC1的输出端由于没有类似第八电阻R18的上拉电阻，其第一比较器IC1必须采用内部输出三极管推挽输出型，其必须自身能够输出高电平。当然第二比较器IC2也可以采用内部输出三极管推挽输出型比较器，因此通过上拉的第八电阻R18，本实施例可以适配的比较器类型范围更广。
为了实现上述第八电阻R18上拉功能，除了在电压比较模块20输出端连接之外，还可以在整形模块80上连接实现，如图9所示的本发明压缩机保护电路的电路结构图，整形模块80还包括第九电阻R19，所述第九电阻R19一端连接第一NPN型三极管基极，另一端连接直流电源，第九电阻R19同样可以实现对电压比较模块20输出端的上拉功能，使得电压比较模块20的第三比较器IC3的适配类型范围更广。
参照图10，图10为本发明第七实施例提供的压缩机保护电路的模块结构图，基于本发明压缩机保护电路第一实施例，压缩机保护电路还包括温度保护模块90，温度保护模块90的输入端连接智能功率模块60，温度保护模块90的输出端连接电压比较模块20的第二输入端；
当智能功率模块60温度过高时，智能功率模块60通过温度保护模块90输出温度保护信号到电压比较模块20的第二输入端，以使电压比较模块20输出保护信号到智能功率模块60，智能功率模60块根据保护信号关断输出相电流以停止压缩机70运行。
参照图11，图11为本发明压缩机保护电路基于图10的温度保护模块90的电路结构图，温度保护模块90包括第六电阻R14、第七电阻R15和第三二极管D8；
第六电阻R14的一端为温度保护模块90的输入端，第六电阻R14的另一端与第七电阻R15的一端共接于第三二极管D8的阳极，第三二极管D8的阴极为温度保护模块90的输出端，第七电阻R15的另一端接地。
本发明实施例采用的智能功率模块60为带温度信号输出功能的智能功率模块，其检测智能功率模块60的内部温度，并通过如图9中智能功率模块60的TO脚输出反映温度的信号，如以不同的电压值反映智能功率模块60不同的内部温度，当压缩机的工作电流过高导致智能功率模块60输出的相电流过大时，智能功率模块60本体的温升会增加很快，这时如果不能得到有效的保护容易损坏模块。其智能功率模块60的TO脚输出反映温度的电压信号经过组成第六电阻R14和第七电阻R15的分压电路生成合适电压范围的电压值，经过第三二极管D8输出到电压比较模块20中第一比较器IC1的反相输入端；第三二极管D8起到隔离作用，对第一比较器IC1的反相输入端产生的干扰信号隔离，防止由于压缩机三相电流Iu、Iv、Iw上产生干扰信号到第一比较器IC1的反相输入端，最后导致损坏智能功率模块60的TO脚；当智能功率模块60温度过高时，其TO脚输出电压信号升高，最后使第一比较器IC1反相输入端的电压大于第一比较器IC1的同相输入端参考电压值时，第一比较器IC1输出低电平信号即压缩机70相电流过大信号，其他工作原理与图2所示的相同，因此不再赘述。
由于智能功率模块60本体的温升有一个时间过程，因此其TO脚输出反映温度的电压信号值的变化也有一个过程，且也是一个波动增大的过程，在其电压信号值接近IC1的同相输入端参考电压值时，同第二实施例中的压缩机相电流过大保护过程类似，如果参考电压不变，同样第一比较器IC1的输出的状态不稳定，而加入了本发明的反馈模块40后，当第一比较器IC1翻转输出保护信号后，通过反馈模块使得IC1的同相输入端参考电压降低，这样只有在下次智能功率模块60本体的温度下降使得TO脚输出反映温度的电压信号值降低到一定值后，第一比较器IC1才能翻转恢复保护信号。因此反馈模块40的加入也克服了智能功率模块60的温升导致第一比较器IC1的输出的状态不稳定最后使得智能功率模块60保护状态不稳定引起其损害问题，使得智能功率模块60保护更加可靠。
参照图12，图12为基于图11的包含本发明压缩机保护电路的完整的压缩机控制相关的一应用电路结构图，其工作原理如下：
二极管D9-D12构成交流输入端的整流电路，对交流输入电压进行整流，转换成直流脉动电压，L、D13、C2构成无源PFC电路，对整流电路输出的直流脉动电压进行功率因素校正，C3为大容量的高压滤波电容，对直流脉动电压进行平滑滤波成稳定的直流电压，为智能功率模块IC3提供工作所述的直流电源，智能功率模块IC3输出U、V、W三相电流驱动变频压缩机M工作。
智能功率模块IC3包含S1、S3、S5构成的上桥臂IGBT(Insulated Gate Bipolar Transistor)开关管和S2、S4、S6构成的下桥臂IGBT开关管以及控制器；其中控制器为HVIC(High Voltage Integrated Circuit)即高压集成电路和LVIC(Low Voltage Integrated Circuit)即低压集成电路，HVIC用于驱动上桥臂IGBT开关管，LVIC用于驱动下桥臂IGBT开关管并包括相关控制和状态信号引脚，具体包括故障信号输出脚F0、故障和保护信号检测脚Cin、智能功率模块内部温度检测信号输出脚TO以及下桥臂开关管的U、V、W三相的发射极输出脚Iu、Iv、Iw。
MCU IC4为信号处理芯片，包含了驱动智能功率模块IC3工作的软件算法程序以及其状态检测、变频压缩机M的状态检测相关程序等；MCU的P3-P7六个引脚分别连接到智能功率模块IC5的Wn、Vn、Un、Wp、Vp、Up输入引脚，这六个输入引脚连接到LVIC和HVIC，以此通过LVIC和HVIC驱动上下桥臂的IGBT开关管。
其他部分电路与图11所示的包含电流采样模块、电压比较模块、整形模块、参考电压模块、反馈模块相关电路，其工作原理与图11相同，在此不再赘述。
本发明还提供一种空调器，包括上述压缩机保护电路，其空调器为变频空调器，其具体的实施方式可参考上述实施例，在此不再赘述。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (14)

  1. 一种压缩机保护电路，包括电流采样模块、电压比较模块、参考电压模块、整形模块、MCU及智能功率模块；所述智能功率模块根据所述MCU所输出的驱动信号输出相电流以驱动压缩机运行；所述参考电压模块生成参考电压输出到所述电压比较模块的第一输入端；所述电流采样模块对压缩机的相电流进行采样并输出相应的采样电压信号至所述电压比较模块的第二输入端；所述电压比较模块将所述采样电压信号与所述参考电压信号进行比较，并在所述采样电压信号大于所述参考电压信号时，输出保护信号经所述整形模块整形至所述智能功率模块；所述智能功率模块根据所述保护信号关断输出相电流以停止压缩机运行，同时输出故障保护信号以使所述MCU停止输出所述驱动信号；其特征在于，所述压缩机保护电路还包括：
    反馈模块，输入端与所述电压比较模块的输出端连接，输出端与所述电压比较模块的第一输入端连接；当所述电压比较模块在压缩机相电流过大超过预设值输出保护信号时，将所述电压比较模块输出的保护信号反馈至所述电压比较模块的第一输入端，使得所述电压比较模块第一输入端的电压值降低。
  2. 如权利要求1所述的压缩机保护电路，其特征在于，所述电压比较模块包括第一比较器；
    所述电压比较模块的第一输入端连接所述第一比较器的同相输入端，所述电压比较模块的第二输入端连接所述第一比较器的反向相输入端。
  3. 如权利要求1所述的压缩机保护电路，其特征在于，所述反馈模块包括第一电阻；
    所述第一电阻的一端为反馈模块的输入端，所述第一电阻的另一端为反馈模块的输出端。
  4. 如权利要求1所述的压缩机保护电路，其特征在于，所述反馈模块包括第一二极管；
    所述第一二极管的阴极为反馈模块的输入端，所述第一二极管的阳极为反馈模块的输出端。
  5. 如权利要求1所述的压缩机保护电路，其特征在于，所述反馈模块包括第二电阻和第二二极管；
    所述第二二极管的阴极为所述反馈模块的输入端，所述第二二极管的阳极连接所述第二电阻的一端，所述第二电阻的另一端为所述反馈模块的输出端。
  6. 如权利要求1所述的压缩机保护电路，其特征在于，所述整形模块包括第三电阻和第一NPN三极管；
    所述第一NPN型三极管的基极为所述整形模块的输入端，所述第一NPN型三极管的发射极接地，所述第一NPN型三极管的集电极与所述第三电阻一端的共接点为所述整形模块的输出端，所述第三电阻另一端接直流电源。
  7. 如权利要求1所述的压缩机保护电路，其特征在于，所述整形模块包括第四电阻、第二NPN三极管和第三NPN三极管；
    所述第二NPN型三极管的基极为所述整形模块的输入端，所述第二NPN型三极管的发射极连接所述第三NPN三极管的基极，所述第二NPN型三极管的集电极与所述第三NPN型三极管的集电极以及第四电阻一端的共接点为所述整形模块的输出端，所述第四电阻另一端连接直流电源，所述第三NPN型三极管的发射极接地。
  8. 如权利要求1所述的压缩机保护电路，其特征在于，所述整形模块包括第五电阻、第四NPN三极管和第五PNP三极管；
    所述第四NPN型三极管的基极为所述整形模块的输入端，所述第四NPN型三极管的集电极连接所述第五PNP三极管的基极，所述第五PNP型三极管的发射极与第五电阻一端的共接点为所述整形模块的输出端，所述第五电阻另一端连接直流电源，所述第四NPN型三极管的发射极接地。
  9. 如权利要求1所述的压缩机保护电路，其特征在于，所述整形模块包括第六电阻和第六PNP三极管；
    所述第六PNP型三极管的基极为所述整形模块的输入端，所述第六PNP型三极管的发射极接直流电源，所述第六PNP型三极管的集电极与所述第六电阻一端的共接点为所述整形模块的输出端，所述第六电阻另一端连接地。
  10. 如权利要求1所述的压缩机保护电路，所述压缩机保护电路还包括温度保护模块，所述温度保护模块的输入端连接所述智能功率模块，所述温度保护模块的输出端连接所述电压比较模块的第二输入端；
    当所述智能功率模块温度过高时，智能功率模块通过温度保护模块输出温度保护信号到所述电压比较模块的第二输入端，以使所述电压比较模块输出保护信号到所述智能功率模块，所述智能功率模块根据所述保护信号关断输出相电流以停止所述压缩机运行。
  11. 如权利要求10所述的压缩机保护电路，其特征在于，所述温度保护模块包括第六电阻、第七电阻和第三二极管；
    所述第六电阻的一端为所述温度保护模块的输入端，所述第六电阻的另一端与所述第七电阻的一端共接于所述第三二极管的阳极，所述第三二极管的阴极为所述温度保护模块的输出端，所述第七电阻的另一端接地。
  12. 如权利要求2所述的压缩机保护电路，其特征在于，所述电压比较模块还包括第八电阻，所述第八电阻一端连接所述第一比较器的输出端，另一端连接直流电源。
  13. 如权利要求6所述的压缩机保护电路，其特征在于，所述整形模块还包括第九电阻，所述第九电阻一端连接第一NPN型三极管基极，另一端连接直流电源。
  14. 一种空调器，其特征在于，所述空调器包括如权利要求1所述的压缩机保护电路。
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