CN105007662A - LED light and dual power supply switch color temperature tuning control circuit thereof - Google Patents
LED light and dual power supply switch color temperature tuning control circuit thereof Download PDFInfo
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Abstract
The invention relates to an LED light and a dual power supply switch color temperature tuning control circuit thereof. The dual power supply switch color temperature tuning control circuit comprises a dual constant current power supply system which comprises a first constant current control circuit and a second constant current control circuit, a rectifier bridge circuit, an input switch, an input switch detection circuit which is used for detecting on/off state of the input switch and outputting a switch detection signal, and a switch detection chip. The first end of the input switch is connected with an alternating current power supply, and the second end is connected with the input end of the rectifier bridge circuit. The switch detection chip is used for receiving the switch detection signal, generating a first drive signal and a second drive signal according to the switch detection signal, and outputting the first drive signal and the second drive signal to the first constant current control circuit and the second constant current control circuit of the dual constant current power supply system. According to the invention, the dual power supply switch color temperature tuning control circuit is simplified; the cost of an LED drive power supply is reduced; and the volume is reduced.
Description
Technical Field
The invention relates to the field of LED illumination, in particular to an LED dual-power switch color temperature adjusting controller.
Background
With the continuous expansion of the application range of LED illumination, the LED illumination is gradually developed from the single illumination function to the intellectualization, humanization and energy conservation. In order to meet the requirements of people on light in different scenes, the LED lighting lamp with the function of adjusting the color temperature by switching is produced.
The existing color temperature adjusting scheme is very complex regardless of the MCU or the color temperature adjusting scheme realized by the existing control chip, and an independent detection circuit is needed to detect the action of an input switch. The detection circuit needs not only the original device which is resistant to high voltage but also a complex rectifying and filtering circuit because the circuit needs to bear high voltage when the switch of the input end is detected, the input is an alternating voltage, and the voltage needs to be rectified. The complicated circuit not only causes an increase in the cost of the driving power supply, but also causes an increase in the volume of the driving power supply, which is disadvantageous to the popularization of LEDs.
The LED illumination color temperature adjusting scheme is mainly adjusted through a remote control or an input switch at present, in the two technologies, the cost of adjustment through the input switch is the lowest, and the existing circuit is not required to be modified, so the color temperature adjusting scheme of the switch is more and more accepted by people.
Two power supplies in the double-constant-current power supply system respectively drive the LED lamp beads with two color temperatures, and the input switch is used for adjusting the color temperature, so that the switches of the power supplies in the double-constant-current power supply system are controlled through the on and off of the input switch, and the color temperature conversion of the LED lamp is realized. The LED lamp string conducted can be changed once every time the input switch is switched once, and the conducting sequence of the LED lamp string can be changed along with the on-off cycle of the input switch. Since the operation of the input switch is required to be detected, a special detection circuit is required to be designed to detect the input end. As shown in fig. 1 and 2, the input detection circuit is composed of a diode 101, filter capacitors 102 and 106, a current limiting resistor 103, and a zener diode 104. Since the input voltage 100 is an ac waveform 200 and the voltage is an ac high voltage, the detection circuit can withstand a high voltage of several hundreds of volts when detecting such a voltage, and the detection circuit converts the ac output voltage into a dc voltage and then detects the dc voltage. The current scheme is that a diode 101 is used for converting an alternating current input voltage into a direct current voltage, a large high-voltage capacitor 102 is connected in parallel for filtering, and then the direct current voltage needs to be converted into a low-voltage signal 201 through a high-voltage-to-low-voltage circuit composed of a resistor 103, a voltage stabilizing diode 104 and a filtering capacitor 106. The low-voltage signal 201 is input to the input of the control chip, and the control chip judges the action of the input switch through the signal, so that the switch of each power supply in the dual-power-supply constant-current system is controlled, and the color temperature is changed. Since the existing control chip generally cannot directly drive the MOS or thyristor, a driving circuit needs to be designed by using discrete components. The driving circuit is generally composed of resistors 108,109,111, 112 and a PNP transistor 110.
The existing scheme for adjusting the color temperature of the input switch has a plurality of peripheral components, so that the LED driving power panel is difficult to miniaturize, and the cost is increased.
Disclosure of Invention
The invention aims to solve the technical problems that an LED dual-power switch color temperature adjusting control circuit and an LED illuminating lamp comprising the control circuit are provided, and the defects that an existing input switch color temperature adjusting LED drive circuit is large in size and high in cost are overcome.
The technical scheme adopted by the invention for solving the technical problems is as follows: an LED dual-power switch color temperature adjusting control circuit is constructed and used for controlling the connection/disconnection of a single constant current power supply in a dual-direct current constant current power supply, and the dual-power switch color temperature adjusting control circuit comprises:
the double-constant-current power supply system comprises a first constant-current control circuit and a second constant-current control circuit, and is used for providing a constant-current power supply for a load;
the rectifier bridge circuit is used for converting input alternating current into direct current and outputting the direct current to the double-constant-current power supply system;
the first end of the input switch is connected with an alternating current power supply, and the second end of the input switch is connected with the input end of the rectifier bridge circuit;
an input switch detection circuit connected between the second end of the input switch and ground for detecting the on/off state of the input switch and outputting a switch detection signal;
and the switch detection chip is connected with the input switch detection circuit and the double constant current power supply system, receives the switch detection signal, generates a first driving signal and a second driving signal according to the switch detection signal, and respectively outputs the first driving signal and the second driving signal to a first constant current control circuit and a second constant current control circuit of the double constant current power supply system.
In the dual power switch color temperature adjustment control circuit of the invention, the switch detection chip comprises: the system comprises a switch detection signal receiving end, an auxiliary power supply end, an input waveform detection and internal power supply module, a noise suppression module, a state storage module, a driving module, a first pull-down switch, a second pull-down switch, a first driving signal output end and a second driving signal output end; wherein,
the switch detection signal receiving end and the auxiliary power supply end are connected to the input waveform detection and internal power supply module;
the first drive signal output end is respectively connected with the first pull-down switch and a first constant current control circuit of the double constant current power supply system, and the second drive signal output end is respectively connected with a second pull-down switch and a second constant current control circuit of the double constant current power supply system; and is
The output signal of the input waveform detection and internal power supply module is processed by the noise suppression module and then transmitted to the state storage module; the state signal output by the state storage module is transmitted to the driving module; the driving module generates a first driving signal and a second driving signal according to the state signal, the first driving signal is transmitted to the first constant current control circuit through the first pull-down switch and the first driving signal output end, and the second driving signal is transmitted to the second constant current control circuit through the second pull-down switch and the second driving signal output end.
In the dual power switch color temperature adjustment control circuit of the invention, the input switch detection circuit comprises: the diode, the first voltage-dividing resistor and the second voltage-dividing resistor are sequentially connected in series; the anode of the diode is connected with the second end of the input switch, and the cathode of the diode is connected with the first divider resistor; one end of the second voltage-dividing resistor is connected with the first voltage-dividing resistor, and the other end of the second voltage-dividing resistor is grounded; and the connection node of the first voltage-dividing resistor and the second voltage-dividing resistor is a switch detection signal output end which is connected with the switch detection signal receiving end.
In the dual-power switch color temperature adjusting control circuit, an energy storage capacitor is connected between the auxiliary power supply end of the switch detection chip and the ground and used for supplying power to the switch detection chip when the input switch is turned off so as to keep the internal state of the switch detection chip.
In the dual power switch color temperature adjustment control circuit of the invention, the input waveform detection and internal power supply module comprises: the voltage clamping circuit comprises a clamping circuit, an inverter, a delay module, a voltage stabilizing diode, a diode and a resistor; wherein
The voltage clamping circuit is formed by connecting a plurality of voltage-stabilizing tubes in series, the negative electrode of the voltage-stabilizing tube is connected with the switch detection signal receiving end, the positive electrode of the voltage-stabilizing tube is connected with the positive electrode of the diode, the first end of the resistor and the input end of the phase inverter, and the second end of the resistor is grounded;
the cathode of the diode is connected to the auxiliary power supply end and the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is grounded;
the output end of the phase inverter is connected with the input end of the delay module, and the output end of the delay module is the output end of the input waveform detection and internal power supply module.
In the dual-power switch color temperature adjusting control circuit of the invention,
a first current limiting resistor is connected between the first drive signal output end and the first pull-down switch;
and a second current limiting resistor is connected between the second drive signal output end and the second pull-down switch.
In the dual-power switch color temperature adjusting control circuit, the energy storage capacitor can adjust the state holding time by changing the size of the energy storage capacitor.
In the dual-power switch color temperature adjusting control circuit, a first constant current control circuit and a second constant current control circuit in the dual-constant current power supply system are isolated flyback constant current control circuits or non-isolated step-down constant current control circuits.
In the dual-power switch color temperature adjustment control circuit, the first constant current control circuit and the second constant current control circuit respectively comprise a first constant current control chip and a second constant current control chip, the first driving signal output end is connected with the power pin of the first constant current control chip, and the second driving signal output end is connected with the power pin of the second constant current control chip.
The other technical scheme adopted by the invention for solving the technical problem is as follows: the LED illuminating lamp comprises LED lamp beads with two color temperatures and a dual-power switch color temperature adjusting control circuit, wherein a first constant current control circuit and a second constant current control circuit of the dual-constant current power supply system respectively control constant current power supply of the LED lamp beads with the first color temperature and the LED lamp beads with the second color temperature.
The implementation of the invention has the following beneficial effects: because the dual-power switch color temperature adjusting control circuit supplies power for the LED lamp bank, the switch detection chip selectively controls the on/off of a single constant current power supply in the dual-direct-current constant current power supply, high-voltage-resistant components and complex rectifying and filtering circuits are not needed, the structure of the LED switch color temperature adjusting control circuit is simplified, the cost of an LED driving circuit is reduced, and the size is reduced. In practical application, the size and the cost are very important for lighting lamps such as a bulb lamp and a spot lamp.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a prior art LED driver circuit for color temperature regulation by switching;
FIG. 2 is a graph of voltage waveforms at node 100 and node 105 in the LED driver circuit shown in FIG. 1;
FIG. 3 is a schematic circuit diagram of a dual power switch color temperature control circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an input waveform detection and internal power supply module in a switch detection chip in the dual-power switch color temperature adjustment control circuit shown in FIG. 3;
FIG. 5 is a timing waveform diagram of a dual power switch color temperature control circuit;
FIG. 6 is a timing waveform diagram of a state memory block.
Detailed Description
The invention provides a brand-new double-constant-current power supply switch adjusting scheme, wherein a double-power-supply switch color temperature adjusting control circuit can be applied to a driving circuit powered by a direct-current constant-current power supply, for example, the double-power-supply switch color temperature adjusting control circuit can be applied to a driving circuit powered by a flyback constant-current power supply, and can also be applied to a driving circuit powered by a constant-current power supply in a voltage reduction mode.
The dual-power switch color temperature adjusting control circuit is used for controlling the connection/disconnection of a single constant current power supply in a dual-direct current constant current power supply. As shown in fig. 3, the dual-power switch color temperature adjusting control circuit includes: the circuit comprises a double constant current power supply system 309, a rectifier bridge circuit 307, an input switch 319, an input switch detection circuit, a switch detection chip 310 and an energy storage capacitor 306. The double-constant-current power supply system is provided with two sets of constant-current control circuits, each set of constant-current control circuit is controlled by a constant-current control chip, and power pins of the control chips are VCC1 and VCC2 respectively; the signal input end of the switch detection chip is CLK, the signal output end of the switch detection chip is a pin P1 and a pin P2, and the pin P1 and the pin P2 are respectively connected with power pins VCC1 and VCC2 of two control chips of the double constant-current power supply system.
A first embodiment of the present invention will be described below with reference to fig. 3 to 6.
As shown in fig. 3, the input switch 319 has a first end connected to the ac power source and a second end connected to the input end of the rectifier bridge circuit 307; the output end of the rectifier bridge circuit 307 is connected to the input end of the double-dc constant current power supply.
The input switch detection circuit is composed of a diode 301, a first voltage-dividing resistor 303 and a second voltage-dividing resistor 305, wherein the anode of the diode 301 is connected with the second end of the input switch 316, and the cathode of the diode is connected with the first resistor 303; one end of the second divider resistor 305 is connected with the resistor 303, and the other end is grounded; and a connection node 304 of the first voltage-dividing resistor 303 and the second voltage-dividing resistor 305 is a switch detection signal output terminal connected to the switch detection signal receiving terminal CLK.
The switch detection chip 310 mainly includes a switch detection signal receiving terminal CLK, an auxiliary power supply terminal VDD, an input waveform detection and internal power supply module 311, a noise suppression module 312, a state storage module 313, a driving module 314, a first pull-down switch 316, a second pull-down switch 318, a first driving signal output terminal P1, and a second driving signal output terminal P2; wherein,
the switch detection signal receiving terminal CLK and the auxiliary power supply terminal VDD are connected to the input waveform detection and internal power supply module 311;
the first driving signal output end P1 is connected with the first pull-down switch 316 and the first constant current control circuit of the dual constant current power supply system 309, respectively, and the second driving signal output end P2 is connected with the second pull-down switch 318 and the second constant current control circuit of the dual constant current power supply system 309, respectively; and is
The output signal of the input waveform detection and internal power supply module 311 is processed by the noise suppression module 312 and then transmitted to the state storage module 313; the state signal output by the state storage module 313 is transmitted to the driving module 314; the driving module 314 generates a first driving signal and a second driving signal according to the status signal, wherein the first driving signal is transmitted to the first constant current control circuit through the first pull-down switch 316 and the first driving signal output terminal P1, and the second driving signal is transmitted to the second constant current control circuit through the second pull-down switch 318 and the second driving signal output terminal P2.
It should be noted that the first constant current control circuit and the second constant current control circuit of the dual-constant current power supply system in the dual-power switch color temperature adjustment control circuit of the invention may be isolated flyback constant current control circuits, or may be non-isolated step-down constant current control circuits.
In addition, the energy storage capacitor 306 is connected between the auxiliary power supply terminal VDD and the ground, and is used for supplying power to the switch detection chip 310 when the input switch 319 is turned off so as to maintain the internal state of the switch detection chip 310, and since the operating current of the control chip is reduced to about 1uA when the input switch is opened, the time for maintaining the state can be adjusted by changing the size of the energy storage capacitor. In one embodiment, the capacitance of the storage capacitor is set based on the hold time required for the switch to detect the internal state of the chip. In another embodiment, the energy storage capacitor may be a variable capacitor, and the time for state retention may be adjusted by changing the size of the energy storage capacitor. Alternatively, the auxiliary power supply terminal VDD may be connected to a dc power supply, and the dc power supply supplies power to the switch detection chip 310.
In this embodiment, the switch detection chip 310 controls the on/off of a single constant current source in the dual constant current power supply system by detecting the action signal generated by the input switch 316. In operation, when the input switch 319 is turned on or off, a corresponding signal waveform 300 is generated, the signal is divided by the first voltage-dividing resistor 303 and the second voltage-dividing resistor 305 through the diode 301, a sampling signal waveform is output through a connection node (i.e., a signal sampling node) 304 of the first voltage-dividing resistor 303 and the second voltage-dividing resistor 305, the sampling signal is transmitted to an input terminal CLK of the switch detection chip 310, and since a voltage clamping circuit of about 25V is built in the input terminal of the switch detection chip, the CLK terminal is finally a waveform 302; the internal state storage module 313 of the switch detection chip 310 changes the storage state according to the input signal, and then determines different switch states of the pull-down switch 316 and the pull-down switch 318 by the driving module 314. The output ends P1 and P2 of the switch detection chip control two control chips of the double constant current power supply system, if one constant current power supply in the double constant current power supply system needs to be turned off or turned on, only the pull-down switch connected with the switch detection chip needs to be turned on or off. For example, to turn off the constant current power supply in the dual constant current system corresponding to the output terminal P1 of the switch detection chip 310, the first pull-down switch 316 connected to P1 is turned on, and the VCC1 pin of the constant current control chip is pulled down to the under-voltage protection of the control chip, and the corresponding constant current power supply is turned off; to turn on the constant current power supply in the dual constant current system corresponding to the output terminal P1 of the switch detection chip 310, the first pull-down switch 316 connected to P1 is turned off, and the pin VCC1 of the constant current control chip is restored to its state and turned on corresponding to the constant current power supply. The operation processes of the power supplies in the dual constant current system corresponding to the output terminal P2 of the switch detection chip 310 are similar and will not be described again.
As shown in fig. 4, according to an embodiment, the waveform detection and internal power supply module of the switch detection chip 310 in the dual power switch color temperature adjustment control circuit shown in fig. 3 includes a clamp circuit 406, an inverter 410, a delay module 411, a zener diode 408, a diode 407, and a resistor 409; the clamping circuit 406 is formed by connecting a plurality of voltage-stabilizing tubes in series, the negative electrode of the clamping circuit is connected with a switch detection signal receiving end CLK, the positive electrode of the clamping circuit is connected with the positive electrode of the diode 407, the first end of the resistor 409 and the input end of the inverter 410, and the second end of the resistor 409 is grounded; the cathode of the diode 407 is connected to the auxiliary power supply terminal VDD, and to the cathode of the zener diode 408, and the anode of the zener diode 408 is grounded; the output end of the inverter 410 is connected to the input end of the delay module 411, and the output end of the delay module 411 is the output end of the input waveform detection and internal power supply module 311.
Fig. 5 is a timing waveform diagram of the dual-power switch color temperature control circuit of fig. 3, wherein,
waveform 500: representative of the on and off states of switch 319;
waveform 501: representative are rectifier bridge 307 and the input signal to the switch detection circuit;
waveform 502: the switch detection chip 310 is used for switching the input signal of the detection signal receiving end CLK;
waveform 503: representative of the input waveform and the output signal of the internal detection module 311;
waveform 504: representative is the output signal of the noise suppression block 312.
During operation, when input switch 319 is closed, waveform 500 displays a high level; when input switch 319 is open, waveform 500 shows a low level.
When the ac input switch 319 is closed (the waveform 500 is at high level), the waveform 502 appears at the output terminal of the switch detection circuit, the switch detection chip 310 clamps and detects the waveform through the input terminal CLK, the waveform is counted by the chip built-in square wave counter, and when two pulses (delay time Td1505) continuously appear in the signal 503, the switch detection chip considers that the ac input switch 319 is closed, and the output state of the noise suppression module 312 inside the chip changes from low level to high level.
When the ac input switch 319 is turned off (the waveform 500 is at a low level), the signal at the output terminal of the switch detection circuit is at a low level, the switch detection signal receiving terminal CLK of the switch detection chip 310 does not detect the signal and keeps for a while (Td2506), the switch detection chip 310 considers that the ac input switch 319 has been turned off, and the output state of the noise suppression module 312 inside the chip changes from a high level to a low level.
The noise suppression module 312 built in the switch detection chip 310 can eliminate the false triggering of the switch detection chip 310 caused by the noise of the CLK input waveform 302 at the switch detection signal receiving end of the switch detection chip, and during the operation, the module generates two delay times Td1505 and Td 2506.
The output waveform 504 of the noise suppression block 312 is input to the state storage block as a trigger for a transition of the state.
Fig. 6 is a timing waveform diagram of the memory block 313 in the switch detect chip shown in fig. 3, wherein,
waveform 600: the reset signal R for resetting the state storage block 313 by the switch detection chip 310;
waveform 601: representative is the state trigger signal IN of state storage block 313;
waveform 602: representative is the state signal S1 after the state storage block 313 is reset;
waveform 603: representative is the state signal S2 after the state storage module 313 is reset.
The waveform 600 is a reset signal R, which resets the state storage block 313 when the switch detection chip 310 is powered on, and the logic levels of the state signals S1602 and S2603 of the reset state storage block are both high (S1 is "1", S2 is "1"), and the state transition trigger signal IN 601 is the output waveform 504 of the noise suppression block 312.
During operation, the state signal of the state storage module changes once each time a rising edge of the signal occurs. The state change sequence of the state storage block is (S1:1, S2:1) - > (S1:0, S2:1) - > (S1:1, S2:0) - > (S1:1, S2:1), and the driving block 314 determines the on or off of the pull-down switch 316 and the pull-down switch according to the state of the state storage block 313.
The switch detection chip 310 controls two control chips in the dual constant current power supply system through the driving signal output terminals P1 and P2, if one constant current power supply in the dual constant current system needs to be turned off, only the switch tube connected with the switch detection chip needs to be conducted, the corresponding switch tube is conducted, and the switch tube pulls the VCC pin of the corresponding constant current control chip down to be under the under-voltage protection of the chip.
In order to avoid the switch tube from being burnt down due to large current in the pull-down process, a resistor is connected in series between the switch tube and the VCC of the constant current control chip, and the resistor is used for protecting the switch tube. As shown in fig. 3, a first current limiting resistor 315 is connected between the first driving signal output terminal P1 and the first pull-down switch 316; a second current limiting resistor 317 is connected between the second driving signal output terminal P2 and the second pull-down switch 318.
The dual-power switch color temperature adjusting control circuit can be used for LED illuminating lamps and used for controlling LED lamp beads with two color temperatures, for example, a first constant current control circuit and a second constant current control circuit of a dual-constant current power supply system 309 respectively control constant current power supply of the LED lamp beads with the first color temperature and the LED lamp beads with the second color temperature.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A dual-power switch color temperature adjusting control circuit is characterized by comprising:
the double-constant-current power supply system (309) comprises a first constant-current control circuit and a second constant-current control circuit, and is used for providing a constant-current power supply for a load;
the rectifier bridge circuit (307) is used for converting input alternating current into direct current and outputting the direct current to the double constant current power supply system (309);
an input switch (319) having a first end connected to an alternating current power supply and a second end connected to an input end of the rectifier bridge circuit (307);
an input switch detection circuit connected between a second terminal of the input switch (319) and ground, for detecting an on/off state of the input switch (319), and outputting a switch detection signal;
and the switch detection chip (310) is connected with the input switch detection circuit and the double constant current power supply system (309), receives the switch detection signal, generates a first driving signal and a second driving signal according to the switch detection signal, and respectively outputs the first driving signal and the second driving signal to a first constant current control circuit and a second constant current control circuit of the double constant current power supply system (309).
2. The dual-power switch color temperature control circuit according to claim 1, wherein the switch detection chip (310) comprises: the circuit comprises a switch detection signal receiving end (CLK), an auxiliary power supply end (VDD), an input waveform detection and internal power supply module (311), a noise suppression module (312), a state storage module (313), a driving module (314), a first pull-down switch (316), a second pull-down switch (318), a first driving signal output end (P1) and a second driving signal output end (P2); wherein,
the switch detection signal receiving end (CLK) and the auxiliary power supply end (VDD) are connected to the input waveform detection and internal power supply module (311);
a first driving signal output end (P1) is respectively connected with the first pull-down switch (316) and a first constant current control circuit of the double constant current power supply system (309), and a second driving signal output end (P2) is respectively connected with a second pull-down switch (318) and a second constant current control circuit of the double constant current power supply system (309); and is
The output signal of the input waveform detection and internal power supply module (311) is processed by a noise suppression module (312) and then is transmitted to a state storage module (313); the state signal output by the state storage module (313) is transmitted to the driving module (314); the driving module (314) generates a first driving signal and a second driving signal according to the state signal, the first driving signal is transmitted to the first constant current control circuit through the first pull-down switch (316) and the first driving signal output end (P1), and the second driving signal is transmitted to the second constant current control circuit through the second pull-down switch (318) and the second driving signal output end (P2).
3. The dual-power switch color temperature control circuit according to claim 2, wherein the input switch detection circuit comprises: the diode (301), the first voltage-dividing resistor (303) and the second voltage-dividing resistor (305) are connected in series in sequence; wherein, the positive pole of the diode (301) is connected with the second end of the input switch (319), and the negative pole is connected with the first voltage dividing resistor (303); one end of the second voltage-dividing resistor (305) is connected with the first voltage-dividing resistor (303), and the other end is grounded; and the connection node (304) of the first voltage-dividing resistor (303) and the second voltage-dividing resistor (305) is a switch detection signal output end which is connected with the switch detection signal receiving end (CLK).
4. The dual-power switch color temperature adjustment control circuit according to claim 2, wherein an energy storage capacitor (306) is connected between the auxiliary power supply terminal (VDD) of the switch detection chip (310) and ground, and is used for supplying power to the switch detection chip (310) when the input switch (319) is turned off so as to maintain the internal state of the switch detection chip (310).
5. The dual-power switch color temperature control circuit according to claim 2, wherein the input waveform detection and internal power supply module (311) comprises: the voltage clamping circuit (406), the inverter (410), the delay module (411), the voltage stabilizing diode (408), the diode (407) and the resistor (409); wherein
The voltage clamping circuit (406) is formed by connecting a plurality of voltage-stabilizing tubes in series, the negative electrode of the voltage-stabilizing tube is connected with a switch detection signal receiving end (CLK), the positive electrode of the voltage-stabilizing tube is connected with the positive electrode of a diode (407), the first end of a resistor (409) and the input end of an inverter (410), and the second end of the resistor (409) is grounded;
the cathode of the diode (407) is connected to the auxiliary power supply terminal (VDD) and to the cathode of the zener diode (408), and the anode of the zener diode (408) is grounded;
the output end of the inverter (410) is connected with the input end of the delay module (411), and the output end of the delay module (411) is the output end of the input waveform detection and internal power supply module (311).
6. The dual-power switch color temperature adjustment control circuit according to claim 2,
a first current limiting resistor (315) is connected between the first driving signal output end (P1) and the first pull-down switch (316);
a second current limiting resistor (317) is connected between the second driving signal output end (P2) and the second pull-down switch (318).
7. The dual-power switch color temperature adjustment control circuit according to claim 4, wherein the capacitance of the energy storage capacitor (306) is set according to the retention time required by the internal state of the switch detection chip (310).
8. The dual-power-supply-switch color temperature adjusting control circuit according to claim 2, wherein the first constant-current control circuit and the second constant-current control circuit in the dual-constant-current power supply system (309) are isolated flyback constant-current control circuits or non-isolated buck constant-current control circuits.
9. The dual-power-switch color temperature adjustment control circuit according to claim 2, wherein the first constant current control circuit and the second constant current control circuit respectively comprise a first constant current control chip and a second constant current control chip, and the first driving signal output terminal (P1) is connected to the power pin VCC1 of the first constant current control chip, and the second driving signal output terminal (P2) is connected to the power pin VCC2 of the second constant current control chip.
10. An LED illuminating lamp is characterized by comprising LED lamp beads with two color temperatures and the dual-power-switch color temperature adjusting control circuit as claimed in any one of claims 1 to 9, wherein a first constant current control circuit and a second constant current control circuit of the dual-constant current power supply system (309) respectively control constant current power supply of the LED lamp beads with the first color temperature and the LED lamp beads with the second color temperature.
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| CN201510458864.2A CN105007662A (en) | 2015-07-30 | 2015-07-30 | LED light and dual power supply switch color temperature tuning control circuit thereof |
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| CN113853042A (en) * | 2020-06-28 | 2021-12-28 | 鸣志电器(太仓)有限公司 | An LED color temperature adjustment circuit that can effectively prevent current overshoot |
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