Standby energy-saving control device

Abstract

The embodiment of the invention provides a standby energy-saving control device. The device comprises a driving signal generation circuit which is connected with a switching circuit; the slow start power supply circuit is connected with the voltage stabilizing circuit, the one-way switch circuit and a power supply input port of the power supply circuit; one end of the voltage stabilizing circuit is connected with the slow start power supply circuit, and the other end is connected with the switching circuit and the one-way switching circuit; one end of the switching circuit is connected with the driving signal generating circuit, one end is connected with the voltage stabilizing circuit, and the other end is connected with the one-way switching circuit; and one end of the one-way switch circuit is connected with the switch circuit and the voltage stabilizing circuit, and the other end is connected with the power input port of the power circuit. According to the embodiment of the invention, the standby energy-saving control of the power supply circuit of the stroboscopic light supplement lamp is realized, and the standby power consumption of the stroboscopic light supplement lamp is reduced.

Description

Technical Field

[0001] The present invention relates to the field of circuit technologies, and particularly to a standby energy-saving control device for a power supply circuit of a stroboscopic supplementary light. Background Art

[0002] Currently, LED (Light-Emitting Diode) stroboscopic supplementary lights are applied in many scenarios. When the light is insufficient, they use specific light to supplement the light for the capture camera to make up for the insufficient light. LED stroboscopic supplementary lights basically do not need to supplement the light for the capture camera during the day, and are in the standby state for nearly 12 hours every day. At present, the standby power consumption of LED stroboscopic supplementary lights is 2 - 3W (watts), resulting in a batch of waste of electric energy. Summary of the Invention

[0003] An embodiment of the present invention provides a standby energy-saving control device to reduce the power consumption of the stroboscopic supplementary light in the standby state.

[0004] The technical solution of the embodiment of the present invention is implemented as follows: A standby energy-saving control device, which includes: a drive signal generation circuit, a soft-start power supply circuit, a voltage stabilization circuit, a switch circuit, and a one-way switch circuit, where: The drive signal generation circuit is connected to the switch circuit; The soft-start power supply circuit is connected to the voltage stabilization circuit, the one-way switch circuit, and the power input port of the power supply circuit; where the power supply circuit is the power supply circuit of the stroboscopic supplementary light; The voltage stabilization circuit is connected to the soft-start power supply circuit at one end and to the switch circuit and the one-way switch circuit at the other end; The switch circuit includes: a first MOS transistor, a third resistor, and a third capacitor, where: the drain of the first MOS transistor is connected to the voltage stabilization circuit and the one-way switch circuit, the gate is connected to the drive signal generation circuit, and the source is grounded; the third resistor and the third capacitor are both connected in parallel between the gate and the source of the first MOS transistor; The one-way switch circuit includes: a first diode and a thyristor, where: the positive electrode of the first diode is connected to the power input port of the power supply circuit, the negative electrode is connected to the anode of the thyristor; the anode of the thyristor is connected to the negative electrode of the first diode, the gate is connected to the voltage stabilization circuit and the switch circuit, and the cathode is grounded; When the drive signal generation circuit does not output any signal, the switch circuit is disconnected, and the soft-start power supply circuit continuously outputs current to the voltage stabilization circuit, the one-way switch circuit, and the power input port of the power supply circuit. The one-way switch circuit is turned on, and the voltage of the power input port of the power supply circuit is always lower than the working voltage of the power supply circuit, realizing the standby energy-saving function.

[0005] When the drive signal generation circuit outputs a drive signal, the switch circuit conducts, and the soft-start power supply circuit continuously outputs current to the voltage regulation circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is turned off, so that the voltage at the power input port of the power supply circuit reaches the operating voltage of the power supply circuit, and thus the power supply circuit starts and enters the operating state.

[0006] The soft-start power supply circuit includes: a DC power supply, a first resistor, and a first capacitor, where: One end of the first resistor is connected to the DC power supply, and the other end is connected to the voltage regulation circuit, the unidirectional switch circuit, the positive electrode of the first capacitor, and the power input port of the power supply circuit; The positive electrode of the first capacitor is connected to the power input port of the power supply circuit, and the negative electrode is grounded.

[0007] The voltage regulation circuit includes: a second resistor, a second capacitor, and a voltage regulator device, where: One end of the second resistor is connected to the power input port of the power supply circuit, and the other end is connected to the positive electrode of the second capacitor and the negative electrode of the voltage regulator device; The positive electrode of the second capacitor is connected to the negative electrode of the voltage regulator device, and the negative electrode of the second capacitor is grounded; The negative electrode of the voltage regulator device is connected to the positive electrode of the second capacitor, and the positive electrode of the voltage regulator device is connected to the switch circuit and the unidirectional switch circuit.

[0008] The switch circuit further includes: a second diode, a fourth resistor, and a fifth resistor, where: The second diode is connected in series between the drive signal generation circuit and the gate of the first MOS transistor, and the positive electrode of the second diode is connected to the drive signal generation circuit, and the negative electrode is connected to the gate of the first MOS transistor; The fourth resistor is connected in series between the drive signal generation circuit and the gate of the first MOS transistor; The fifth resistor is connected in series between the voltage regulation circuit and the drain of the first MOS transistor.

[0009] The unidirectional switch circuit further includes: a third diode, a fourth diode, a sixth resistor, and a seventh resistor, where: The third diode is connected in series between the working port of the power supply circuit and the anode of the thyristor. Among them, the positive electrode of the third diode is connected to the working port of the power supply circuit, and the negative electrode is connected to the anode of the thyristor; The fourth diode is connected in series between the voltage regulation circuit and the gate of the thyristor, and the positive electrode of the fourth diode is connected to the voltage regulation circuit and the switch circuit, and the negative electrode is connected to the gate of the thyristor; One end of the sixth resistor is connected to the gate of the thyristor, and the other end is grounded; The seventh resistor is connected in series between the power input port of the power supply circuit and the negative electrode of the first diode.

[0010] The device further includes: a synchronous drive circuit, and the synchronous drive circuit includes: an eighth resistor and a first triode, where: the eighth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the base of the first triode; the base of the first triode is connected to the eighth resistor, the collector is connected to the voltage stabilization circuit, and the emitter is connected to the switch circuit; Alternatively, the synchronous drive circuit includes: an eighth resistor and a second MOS transistor, where: the eighth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the gate of the second MOS transistor; the gate of the second MOS transistor is connected to the eighth resistor, the drain is connected to the voltage stabilization circuit, and the source is connected to the switch circuit.

[0011] The synchronous drive circuit further includes: a fifth diode, where the fifth diode is connected in series between the positive output terminal of the drive signal generation circuit and the eighth resistor, and the positive electrode of the fifth diode is connected to the positive output terminal of the drive signal generation circuit, and the negative electrode of the fifth diode is connected to the eighth resistor.

[0012] The device further includes: an isolation drive circuit, and, The isolation drive circuit includes: a ninth resistor and a unidirectional optocoupler, where: The ninth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the positive electrode of the primary side of the unidirectional optocoupler; The positive electrode of the primary side of the unidirectional optocoupler is connected to the ninth resistor, the negative electrode of the primary side is connected to the negative output terminal of the drive signal generation circuit, the collector of the secondary side is connected to the voltage stabilization circuit, and the emitter of the secondary side is connected to the switch circuit.

[0013] The isolation drive circuit further includes: a sixth diode, and the sixth diode is connected in series between the negative output terminal of the drive signal generation circuit and the negative electrode of the primary side of the unidirectional optocoupler, where the positive electrode of the sixth diode is connected to the negative electrode of the primary side of the unidirectional optocoupler, and the negative electrode of the sixth diode is connected to the negative output terminal of the isolation drive circuit.

[0014] The drive signal generation circuit is a pulse width modulation signal generation circuit.

[0015] The device further includes: a synchronous drive circuit, and, The synchronous drive circuit includes: a tenth resistor and a second triode, where: the tenth resistor is connected in series between the base of the second triode and the voltage stabilization circuit; the base of the second triode is connected to the drive signal generation circuit and one end of the tenth resistor, the collector is connected to the other end of the tenth resistor and the voltage stabilization circuit, and the emitter is connected to the switch circuit; Alternatively, the synchronous drive circuit includes: a tenth resistor and a third MOS transistor, where: the tenth resistor is connected in series between the gate of the third MOS transistor and the voltage regulation circuit; the gate of the third MOS transistor is connected to the drive signal generation circuit and one end of the tenth resistor, the drain is connected to the other end of the tenth resistor and the voltage regulation circuit, and the source is connected to the switch circuit.

[0016] The drive signal generation circuit is a light sensor.

[0017] In the above embodiments, by adding a drive signal generation circuit, a voltage regulation circuit, a switch circuit, and a unidirectional switch circuit, and the switch circuit includes: a first MOS transistor, a third resistor, and a third capacitor, and the unidirectional switch circuit includes: a first diode and a thyristor, standby energy-saving control of the power supply circuit of the stroboscopic supplementary light is achieved, and the standby power consumption of the stroboscopic supplementary light is reduced. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Structural schematic diagram of a standby energy-saving control device provided by an embodiment of the present invention; Figure 2 Structural schematic diagram of a standby energy-saving control device provided by another embodiment of the present invention; Figure 3 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 4 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 5 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 6 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 7 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 8 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 9 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 10 Structural schematic diagram of a standby energy-saving control device provided by still another embodiment of the present invention; Figure 11 Schematic diagram of the standby energy-saving control device provided by another embodiment of the present invention. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0022] Figure 1 Schematic diagram of the standby energy-saving control device provided by an embodiment of the present invention. As Figure 1 shown, the device mainly includes: a drive signal generation circuit, a soft-start power supply circuit, a voltage stabilization circuit, a switching circuit, and a one-way switching circuit, where: 1. Drive signal generation circuit Connected to the switching circuit. For: generating a drive signal and outputting it to the switching circuit.

[0023] 2. Soft-start power supply circuit Connected to the voltage stabilization circuit, the one-way switching circuit, and the power input port of the power supply circuit. For: supplying power to the voltage stabilization circuit, the one-way switching circuit, and the power supply circuit.

[0024] The power supply circuit is the power supply circuit located inside the controlled device. The controlled device is, for example: a stroboscopic supplementary light, specifically, for example: an LED stroboscopic supplementary light. The power supply circuit is generally a circuit composed of a control chip of a switching power supply and its peripheral hardware.

[0025] 3. Voltage stabilization circuit One end is connected to the soft-start power supply circuit, and the other end is connected to the switch circuit and the unidirectional switch circuit. Function: Perform voltage stabilization control according to the current input by the soft-start power supply circuit, so as to provide a stable driving voltage for the switch circuit and provide current for the unidirectional switch circuit.

[0026] IV) Switch circuit One end is connected to the drive signal generation circuit, one end is connected to the voltage stabilization circuit, and the other end is connected to the unidirectional switch circuit. Function: According to the drive signal input by the drive signal generation circuit and the driving voltage provided by the voltage stabilization circuit, conduct or disconnect, so as to control the conduction or disconnection of the unidirectional switch circuit.

[0027] Among them, the specific structure of the switch circuit can be as Figure 2 shown, that is, the switch circuit includes: the first MOS transistor (metal-oxide-semiconductor field effect transistor) Q1, the third resistor R3, and the third capacitor C3, where: the drain of Q1 is connected to the voltage stabilization circuit and the unidirectional switch circuit, the gate is connected to the drive signal generation circuit, and the source is grounded; both R3 and C3 are connected in parallel between the gate and the source of Q1. R3 is the bias resistor of the gate-source of Q1, C3 is the energy storage capacitor, and R5 is the current limiting resistor of the drain current of Q1.

[0028] V) Unidirectional switch circuit One end is connected to the switch circuit and the voltage stabilization circuit, and the other end is connected to the power input port of the power supply circuit. Function: Conduct or disconnect according to the switch state of the switch circuit and the current input by the voltage stabilization circuit, so as to control the power supply voltage of the power supply circuit, so that the power supply circuit enters the standby energy-saving or working state.

[0029] Among them, the specific structure of the unidirectional switch circuit can be as Figure 2 shown, that is, the unidirectional switch circuit includes: the first diode D1 and the thyristor Q2, where: the positive electrode of D1 is connected to V CC , the negative electrode is connected to the anode of Q2; the anode of Q2 is connected to the negative electrode of D1, the gate is connected to the voltage stabilization circuit and the switch circuit, and the cathode is grounded. D1 and Q2 form a short-circuit control channel to control the V CC port of the power supply circuit. During standby energy-saving control, the voltage of the V CC port of the power supply circuit is pulled down so that the power supply chip does not work due to undervoltage.

[0030] Figure 1 The device shown realizes the standby energy-saving and start-up work control of the power supply circuit through the following process: I. Standby energy-saving control When the power supply circuit is to enter the standby energy-saving state, first control the drive signal generation circuit not to output any signal. Then, no current enters the switch circuit, the switch circuit is disconnected, and the soft-start power supply circuit continuously outputs current to the voltage stabilization circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is turned on, and the voltage at the power input port of the power supply circuit is always lower than the operating voltage of the power supply circuit, realizing the standby energy-saving function.

[0031] II. Startup Working Control When the power supply circuit is to be started and enter the working state, first control the drive signal generation circuit to output a drive signal. Then, the switch circuit is turned on, and the soft-start power supply circuit continuously outputs current to the voltage stabilization circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is disconnected, and the voltage at the power input port of the power supply circuit reaches the operating voltage of the power supply circuit, so that the power supply circuit starts and enters the working state.

[0032] In the above embodiments, by adding a drive signal generation circuit, a voltage stabilization circuit, a switch circuit, and a unidirectional switch circuit, and the switch circuit includes: a first MOS transistor, a third resistor, and a third capacitor, and the unidirectional switch circuit includes: a first diode and a thyristor, the standby energy-saving and startup working control of the power supply circuit of the controlled device (such as: a stroboscopic supplementary light) are realized, and the standby power consumption of the controlled device (such as: a stroboscopic supplementary light) is reduced.

[0033] Figure 2 The structural schematic diagram of the standby energy-saving control device provided by another embodiment of the present invention is as follows. As Figure 2 shown: I) The soft-start power supply circuit includes: a DC power supply V DC , a first resistor R1, and a first capacitor C1, where: One end of R1 is connected to V DC , and the other end is connected to the voltage stabilization circuit, the unidirectional switch circuit, the positive electrode of C1, and the power input port V CC of the power supply circuit. The resistance value of R1 is generally selected as 500 - 1000 kΩ (kiloohm); The positive electrode of C1 is connected to V CC , and the negative electrode is grounded.

[0034] V DC can be the DC voltage after the AC voltage passes through the rectifier bridge, or it can be a DC voltage.

[0035] II) The voltage stabilization circuit includes: a second resistor R2, a second capacitor C2, and a voltage stabilizing device ZD1, where: One end of R2 is connected to V CC , and the other end is connected to the positive electrode of C2 and the negative electrode of ZD1; The positive electrode of C2 is connected to the negative electrode of ZD1, and the negative electrode of C2 is grounded; The negative electrode of ZD1 is connected to the positive electrode of C2, and the positive electrode of ZD1 is connected to the switch circuit and the unidirectional switch circuit.

[0036] In an alternative embodiment, ZD1 can be a voltage-regulating diode.

[0037] iii) The switch circuit includes: the first MOS transistor (metal-oxide-semiconductor field-effect transistor) Q1, the third resistor R3, and the third capacitor C3, where: The drain of Q1 is connected to the voltage-regulating circuit and the unidirectional switch circuit, the gate is connected to the drive signal generation circuit, and the source is grounded; Both R3 and C3 are connected in parallel between the gate and the source of Q1. R3 is the bias resistor of the gate-source of Q1, C3 is the energy storage capacitor, and R5 is the current-limiting resistor of the drain current of Q1.

[0038] iv) The unidirectional switch circuit includes: the first diode D1 and the thyristor Q2, where: The positive electrode of D1 is connected to V CC , and the negative electrode is connected to the anode of Q2; The anode of Q2 is connected to the negative electrode of D1, the gate is connected to the voltage-regulating circuit and the switch circuit, and the cathode is grounded.

[0039] D1 and Q2 form a short-circuit control channel 1 to control the V of the power supply circuit CC port, and when in standby energy-saving control, the voltage of the V port of the power supply circuit is pulled down so that the power supply chip does not work due to undervoltage. CC

[0040] Figure 2 The device shown realizes the standby energy-saving and startup control of the power supply circuit through the following process: I. Standby energy-saving control When the power supply circuit is to enter the standby state, first control the drive signal generation circuit not to output any signal, then no current enters the switch circuit, and the switch circuit is disconnected; Due to the DC power supply V DC ​There is a continuous DC voltage, generally between 80 and 500V (volts). A DC current flows through R1 and R2, slowly charging C1 and C2 respectively. Among them, the regulated voltage of ZD1 is much smaller than the voltage across C1. Generally, the voltage across C1 varies between 0 and 16V, while the regulated voltage of ZD1 is generally between 7 and 10V. Then, after the voltage across C2 stabilizes, it is between 7 and 10V. And the capacitance of C1 is much larger than that of C2, and the resistance value of R1 is much larger than that of R2. Then, as the voltage across C2 rises to the clamping voltage of ZD1, the voltage across C2 no longer rises. At this time, ZD1 changes from non-conducting to conducting. And as the voltage across C1 rises, the voltage across R2 is the difference between the voltages across C1 and C2. As this voltage difference increases, the current flowing through R2 also increases. This current flows through the gate of ZD1 and Q2 at the same time. When the current flowing through the gate of Q2 increases and reaches the minimum trigger current threshold of Q2, and the voltage V across C1 CC is still lower than the operating voltage of the power supply circuit, the power supply circuit still remains in the non-operating state. Q2 conducts, and the anode of Q2 is pulled down to 0V, and through the D1 channel, the V of the power supply circuit CC is quickly discharged, pulling down V CC When V CC is pulled down low enough to cause the current flowing through the anode of Q2 to be less than the holding current of Q2, Q2 will turn off, allowing the voltages across C1 and C2 to be slowly recharged by R1 and R2, and then the above process is repeated. During this entire stage, the V of the power supply circuit CC is always lower than the operating voltage of the power supply circuit, the power supply circuit always remains in the non-operating state, and the power consumption of the power supply circuit is very low.

[0041] II. Turn off the standby energy-saving function, that is, the control to start and operate the power supply circuit normally When it is necessary to turn off the standby energy-saving state of the power supply circuit and start it to enter the normal operating state, first control the drive signal generation circuit to output a square wave signal with a continuous duty cycle. Generally, the high level of this square wave signal is between 4 and 20V; V DC The output DC current continuously passes through R1 and R2, charging C1 and C2 respectively.

[0042] A square wave signal with a continuous duty cycle switches between high and low levels periodically. Therefore, there is a periodic current to charge C3. Here, the capacitance of C3 is relatively large, generally 1 - 10 µF (microfarads), and the resistance value of R3 is generally taken as 1 - 10 MΩ (megohms). The discharge current of R3 to C3 is very slow. After a few cycles, the gate-source voltage of Q1 rises rapidly to the turn-on threshold voltage, and Q1 conducts. Moreover, Q1 will remain conducting for a long time, keeping the drain voltage of Q1 at 0V. Generally, the turn-on threshold voltage of Q1 is 3V - 4V. That is, when the voltage of C2 slowly rises to about 3V - 4V, Q1 conducts, and the drain voltage of Q1 remains at 0V. Then, there is no gate drive current for Q2, that is, the gate trigger current flowing into Q2 is 0A (amperes), so Q2 always remains in the off state. Then, C1 is continuously charged by R1 to reach the working voltage value of the power supply circuit. Generally, the working voltage of the power supply circuit is 16V - 18V. Then, the power supply circuit can start and work normally, that is, the standby energy-saving function is turned off.

[0043] It can be seen that through Figure 2 the device shown can control the standby energy saving and startup operation of the power supply circuit. In the standby energy-saving mode, the standby power consumption of the power supply circuit can be greatly reduced. Generally, the standby power consumption can be reduced from 2 - 5W (watts) to within 0.1 - 0.2W.

[0044] Figure 3 This is a schematic structural diagram of the standby energy-saving control device provided by another embodiment of the present invention. As Figure 3 shown, compared with the device shown in Figure 2 : I) The switch circuit further includes: a second diode D2 wherein, D2 is connected in series between the drive signal generation circuit and the gate of Q1, and the positive electrode of D2 is connected to the drive signal generation circuit, and the negative electrode of D2 is connected to the gate of Q1.

[0045] The function of D2 is to prevent current from flowing from the switch circuit into the drive signal generation circuit.

[0046] II) The unidirectional switch circuit further includes: a third diode D3 wherein, D3 is connected in series between the working port COMP of the power supply circuit and the anode of the thyristor Q2. Specifically, the positive electrode of D3 is connected to the COMP port of the power supply circuit, and the negative electrode is connected to the anode of Q2.

[0047] D3 forms a short - circuit control for two channels to control the COMP port of the power supply circuit during standby energy - saving control, pulling down the voltage of the COMP port of the power supply circuit, and making the power supply chip stop working immediately. Specifically, during the process of energy - saving control of the power supply circuit, when Q2 conducts and the anode voltage of Q2 is pulled down to 0V, the voltage of the COMP port of the power supply circuit is pulled down through D3, making the power supply circuit stop working immediately.

[0048] Figure 4 This is a schematic structural diagram of the standby energy - saving control device provided by another embodiment of the present invention. As Figure 4 shown, compared with the device shown in Figure 2 and Figure 3 the device shown: 1) The switch circuit further includes: the fourth resistor R4 or / and the fifth resistor R5 Among them, compared with the device shown in Figure 2 , R4 is connected in series between the drive signal generation circuit and the gate of Q1; compared with the device shown in Figure 3 , R4 is connected in series between the negative electrode of D2 and the gate of Q1.

[0049] R5 is connected in series between the voltage - stabilizing circuit and the drain of Q1. Specifically, R5 is connected in series between the positive electrode of ZD1 and the drain of Q1.

[0050] 2) The unidirectional switch circuit further includes: the fourth diode D4 or / and the sixth resistor R6 or / and the seventh resistor R7, where: D4 is connected in series between the voltage - stabilizing circuit and the gate of Q2, and the positive electrode of D4 is connected to the voltage - stabilizing circuit and the switch circuit, and the negative electrode is connected to the gate of Q2; specifically, D4 is connected in series between the positive electrode of ZD1 and the gate of Q2; One end of R6 is connected to the gate of Q2, and the other end is grounded. R6 is the discharge resistor of the gate and cathode of Q2; R7 is connected in series between the V CC port and the negative electrode of D1.

[0051] D4 can increase the voltage threshold for Q2 to conduct. For example, the original gate - enabling voltage of Q2 is 0.4V. By connecting D4 in series in the gate circuit of Q2, the gate - enabling voltage of Q2 can be increased to about 1V.

[0052] Figure 4 The device shown realizes the standby energy - saving and startup control of the power supply circuit through the following process: I. Standby energy - saving control When the power supply circuit is to enter the standby energy - saving state, first control the drive signal generation circuit not to output any signal, then no current enters the switch circuit, and the switch circuit is disconnected; Due to the DC power supply V DCThere is a continuous DC voltage, generally between 80 and 500 V (volts). A DC current flows through R1 and R2, slowly charging C1 and C2 respectively. Among them, the regulated voltage of ZD1 is much smaller than the voltage across C1. Generally, the voltage across C1 varies between 0 and 16 V, while the regulated voltage of ZD1 is generally between 7 and 10 V. Then, after the voltage across C2 stabilizes, it is between 7 and 10 V. And the capacitance of C1 is much larger than that of C2, and the resistance value of R1 is much larger than that of R2. Then, as the voltage across C2 rises to the clamping voltage of ZD1, the voltage across C2 no longer rises. At this time, ZD1 changes from non-conducting to conducting. Moreover, as the voltage across C1 rises, the voltage across R2 is the difference between the voltages across C1 and C2. As this voltage difference increases, the current flowing through R2 also increases. This current flows through the gate of ZD1, D4, and Q2 in sequence. When the current flowing through the gate of Q2 increases and reaches the minimum trigger current threshold of Q2, and the voltage V across C1 CC is still lower than the operating voltage of the power supply circuit, the power supply circuit still remains in the non-operating state. Q2 conducts, and the anode of Q2 is pulled down to 0 V. Through D3, the COMP pin of the power supply circuit is pulled down, causing the power supply circuit to stop working immediately. At the same time, through the D1 channel, V of the power supply circuit CC is quickly discharged, pulling down V CC . When V CC is pulled down low enough so that the current flowing through the anode of Q2 is less than the holding current of Q2, Q2 will turn off, allowing the voltages across C1 and C2 to be slowly charged again by R1 and R2, and the above process is repeated. Among them, R7 is a current-limiting resistor, which can prevent excessive current from flowing through Q2 and causing damage to Q2. During the entire stage, V of the power supply circuit CC is always lower than the operating voltage of the power supply circuit, the power supply circuit always remains in the non-operating state, and the power consumption of the power supply circuit is very low.

[0053] II. Turn off the standby energy-saving function, that is, the control to start and operate the power supply circuit normally When it is necessary to turn off the standby energy-saving state of the power supply circuit and start it to enter the normal operating state, first control the drive signal generation circuit to output a square wave signal with a continuous duty cycle. Generally, the high level of this square wave signal is between 4 and 20 V; The DC current output by V DC continuously passes through R1 and R2, charging C1 and C2 respectively.

[0054] A square wave signal with a continuous duty cycle switches between high and low levels periodically. Therefore, a periodic current flows through D2 and R4 to charge C3. Here, the capacitance of C3 is relatively large, generally 1 to 10 µF (microfarads), the resistance value of R4 is generally taken as 10 to 20 Ω (ohms), and the resistance value of R3 is generally taken as 1 to 10 MΩ (megohms). The current charges C3 quickly through R4, but the discharge current of R3 to C3 is very slow. After a few cycles, the gate-source voltage of Q1 rises rapidly to the turn-on threshold voltage, Q1 conducts, and Q1 remains conducting for a long time, keeping the drain voltage of Q1 at 0V. Generally, the turn-on threshold voltage of Q1 is 3V to 4V, that is, when the voltage of C2 rises slowly to about 3V to 4V, Q1 conducts, the drain voltage of Q1 remains at 0V, D4 does not conduct, then there is no gate drive current for Q2, that is, the gate trigger current flowing into Q2 is 0A (ampere), so Q2 always remains in the off state. Then C1 is continuously charged by R1 to reach the working voltage value of the power supply circuit. Generally, the working voltage of the power supply circuit is 16V to 18V. Then the power supply circuit can start and work normally, that is, the standby energy-saving function is turned off.

[0055] It can be seen that through Figure 4 the device shown can control the standby energy saving and startup of the power supply circuit. In the standby energy-saving function mode, the standby power consumption of the power supply circuit can be greatly reduced. Generally, the standby power consumption can be reduced from 2 to 5W (watts) to within 0.1 to 0.2W.

[0056] Figure 5 This is a schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. As Figure 5 shown, compared with the device shown in Figure 1 , a synchronous drive circuit is added, where: One end of the synchronous drive circuit is connected to the drive signal generation circuit, one end is connected to the voltage stabilization circuit, and the other end is connected to the switch circuit. It is used to: conduct or disconnect according to the drive signal output by the drive signal generation circuit and the voltage output by the voltage stabilization circuit, so as to control the switch circuit to disconnect or conduct.

[0057] Figure 6 This is a schematic structural diagram of an energy-saving control device provided by another embodiment of the present invention. As Figure 6 shown, the synchronous drive circuit at least includes: the eighth resistor R8 and the first triode Q3, where: R8 is connected in series between the positive output terminal of the drive signal generation circuit and the base of Q3. At this time, the negative terminal of the drive signal generation circuit is grounded, and R8 is the base current-limiting resistor of Q3; The base of Q3 is connected to R8; the collector of Q3 is connected to the voltage stabilization circuit, as Figure 6As shown, the collector of Q3 is connected to C2 in the voltage stabilizing circuit; the emitter of Q3 is connected to the switching circuit, such as Figure 6 As shown, the emitter of Q3 is connected to the positive pole of D2 in the switching circuit. Q3 can be an NPN transistor.

[0058] In practical applications, Q3 can also be a second MOS transistor. At this time, R8 is connected in series between the positive output terminal of the drive signal generation circuit and the gate of Q3. The negative pole of the drive signal generation circuit is grounded. R8 is the gate current-limiting resistor of Q3; the gate of Q3 is connected to R8; the drain of Q3 is connected to the voltage stabilizing circuit. Specifically, the drain of Q3 is connected to C2 in the voltage stabilizing circuit; the source of Q3 is connected to the switching circuit. Specifically, the source of Q3 is connected to the positive pole of D2 in the switching circuit.

[0059] Such as Figure 6 As shown, the synchronous drive circuit may further include: a fifth diode D5, where D5 is connected in series between the positive output terminal of the drive signal generation circuit and R8. Specifically, the positive pole of D5 is connected to the positive output terminal of the drive signal generation circuit, and the negative pole is connected to R8.

[0060] In Figure 6 In the device shown, the function of the synchronous drive circuit is as follows: 1) During the standby energy-saving control process, since the drive signal generation circuit does not output any signal, that is, the voltage between the positive and negative output ports is 0V. Therefore, there is no current at the base of Q3, Q3 is turned off, and thus no current flows through D2, R4, and C3. Then, the gate-source voltage of Q1 is 0V, and the drain-source of Q1 is turned off. The subsequent process is the same as that of the Figure 4 device shown.

[0061] 2) During the process of closing the standby energy-saving state and starting to work, since the drive signal generation circuit outputs a square wave signal with a continuous duty cycle, at this time, there is periodically current and no current at the base of Q3, Q3 is periodically turned on and off. The collector current of Q3 is the amplified current of the base current of Q3, generally in a relationship of dozens to hundreds of times. Therefore, there is periodic current flowing through D2 and R4 to charge C3. The subsequent process is the same as that of the Figure 4 device shown.

[0062] Figure 7 This is a schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Such as Figure 7 As shown, compared with the device shown in Figure 1 the device, an isolation drive circuit is added, where: One end of the isolation drive circuit is connected to the drive signal generation circuit, one end is connected to the voltage stabilizing circuit, and the other end is connected to the switching circuit, and is used for: conducting or disconnecting according to the drive signal output by the drive signal generation circuit and the voltage output by the voltage stabilizing circuit, so as to control the switching circuit to conduct or disconnect.

[0063] Figure 8 The structural schematic diagram of the standby energy-saving control device provided by another embodiment of the present invention. As Figure 8 shown, the isolation drive circuit at least includes: a ninth resistor R9 and a unidirectional optocoupler OP1, where: R9 is connected in series between the positive output terminal of the drive signal generation circuit and the positive electrode of the primary side of OP1. R9 is the current-limiting resistor for the forward current of OP1; The positive electrode of the primary side of OP1 is connected to R9, the negative electrode of the primary side is connected to the negative output terminal of the drive signal generation circuit, the collector of the secondary side is connected to the voltage stabilization circuit, and the emitter of the secondary side is connected to the switch circuit; As Figure 8 shown, the collector of the secondary side of OP1 is connected to the positive electrode of C2 in the voltage stabilization circuit, and the emitter of the secondary side is connected to the positive electrode of D2 in the switch circuit.

[0064] As Figure 8 shown, the isolation drive circuit may further include: a sixth diode D6, where D6 is connected in series between the negative output terminal of the drive signal generation circuit and the negative electrode of the primary side of OP1. Specifically, the positive electrode of D6 is connected to the negative electrode of the primary side of OP1, and the negative electrode of D6 is connected to the negative output terminal of the isolation drive circuit. D6 is used to prevent the primary side current of OP1 from flowing into the drive signal generation circuit. The function of D6 is: to prevent the reverse connection of R8 and the negative electrode of the primary side of OP1 in the isolation drive circuit to the positive and negative output terminals of the drive signal generation circuit, which may damage OP1.

[0065] In Figure 8 the device shown, the functions of the isolation drive circuit are as follows: 1) During the standby energy-saving control process, since the drive signal generation circuit does not output any signal, that is, the voltage between the positive and negative output terminals is 0V. Therefore, there is no current in the primary side of OP1, and there is no current in the secondary side of OP1. As a result, no current flows through D2, R4, and C3, and the gate-source voltage of Q1 is 0V, and the drain-source of Q1 is disconnected. The subsequent process is the same as that of the device shown in Figure 4 the figure.

[0066] 2) During the process of closing the standby energy-saving state and starting to work, since the drive signal generation circuit outputs a square wave signal with a continuous duty cycle, at this time, there is periodically current on and off in the primary side of OP1, and there is periodically current on and off in the secondary side of OP1. Therefore, there is a periodic current flowing through D2 and R4 to charge C3. The subsequent process is the same as that of the device shown in Figure 4 the figure.

[0067] Figure 9 The structural schematic diagram of the standby energy-saving control device provided by another embodiment of the present invention. As Figure 9 shown, compared with the device shown in Figure 1 the figure, an isolation drive circuit and a synchronous drive circuit are added, where: One end of the isolation driving circuit is connected to the driving signal generation circuit, and the other end is connected to the synchronous driving circuit; one end of the synchronous driving circuit is connected to the isolation driving circuit, one end is connected to the voltage stabilizing circuit, and the other end is connected to the switching circuit.

[0068] The isolation driving circuit is configured to: conduct or disconnect according to the driving signal output by the driving signal generation circuit, so as to control the conduction or disconnection of the synchronous driving circuit.

[0069] The synchronous driving circuit is configured to: conduct or disconnect according to the current output by the isolation driving circuit and the voltage output by the voltage stabilizing circuit, so as to control the conduction or disconnection of the switching circuit.

[0070] Figure 10 It is a schematic structural diagram of the standby energy-saving control device provided by another embodiment of the present invention. As Figure 10 shown: The isolation driving circuit at least includes: the ninth resistor R9 and the unidirectional optocoupler OP1, and the synchronous driving circuit includes: the eighth resistor R8 and the first triode Q3, where: R9 is connected in series between the positive output terminal of the driving signal generation circuit and the positive electrode of the primary side of OP1; The positive electrode of the primary side of OP1 is connected to R9, the negative electrode of the primary side is connected to the negative output terminal of the driving signal generation circuit, the collector of the secondary side is connected to the collector of Q3, and the emitter of the secondary side is connected to R8; R8 is connected in series between the emitter of the secondary side of OP1 in the isolation driving circuit and the base of Q3; The base of Q3 is connected to R8, the collector is connected to the collector of the secondary side of OP1 and the positive electrode of C2 in the voltage stabilizing circuit; the emitter of Q3 is connected to the positive electrode of D2 in the switching circuit.

[0071] The isolation driving circuit further includes: the sixth diode D6, and D6 is connected in series between the negative output terminal of the driving signal generation circuit and the negative electrode of the primary side of OP1, where the positive electrode of D6 is connected to the negative electrode of the primary side of OP1, and the negative electrode of D6 is connected to the negative output terminal of the isolation driving circuit.

[0072] In Figure 10 the device shown, the functions of the isolation driving circuit and the synchronous driving circuit are as follows: 1) During the standby energy-saving control process, since the driving signal generation circuit does not output any signal, that is, the voltage between the positive and negative output terminals is 0V, therefore, there is no current in the primary side of OP1, so there is no current in the secondary side of OP1, and thus there is no current in the base of Q3, then Q3 is turned off, so there is no current flowing through D2, R4 and C3, then the gate-source voltage of Q1 is 0V, the drain-source of Q1 is turned off, and the subsequent process is the same as Figure 4 the device shown.

[0073] 2) During the process of turning off the standby power-saving state and starting to work, since the driving signal generation circuit outputs a square wave signal with a continuous duty cycle, at this time, there is and is no current periodically in the primary side of OP1, and there is and is no current periodically in the secondary side of OP1. Then, there is and is no current periodically in the base of Q3, and Q3 turns on and off periodically. The collector current of Q3 is the amplified current of the base current of Q3, generally in a relationship of dozens to hundreds of times. Therefore, there is periodic current flowing through D2 and R4 to charge C3, and the subsequent process is the same as Figure 4 the device shown.

[0074] Figures 1 - 10 The driving signal generation circuit in the device shown can be: a PWM (Pulse Width Modulation) generation circuit. In the embodiments of the present invention, a control signal of a square wave allowing a wide fluctuation frequency and a large range of duty cycle changes is allowed, with a frequency range generally of 1 Hz to 20 kHz (kilohertz) and a duty cycle range generally of 0.5% to 99.9%.

[0075] Figure 11 FIG. is a schematic structural diagram of a standby power-saving control device provided by another embodiment of the present invention, and this embodiment gives Figure 5 another structure of the synchronous drive circuit in the device shown. As Figure 11 shown, the synchronous drive circuit includes: a tenth resistor R10 and a second triode Q4, where: R10 is connected in series between the base of Q4 and the voltage stabilization circuit. Specifically, as Figure 11 shown, R10 is connected in series between the base of Q4 and the positive electrode of C2 in the voltage stabilization circuit, and R10 is the base current-limiting resistor of Q4; One end of R10 and the positive output terminal of the driving signal generation circuit are connected to the base of Q4, the other end of R10 and the voltage stabilization circuit (specifically, the positive electrode of C2 in the voltage stabilization circuit) are connected to the collector of Q4, and the emitter of Q4 is connected to the switch circuit (specifically, the positive electrode of D2 in the switch circuit).

[0076] In practical applications, Q4 can also be a third MOS transistor. At this time, R10 is connected in series between the gate of Q4 and the voltage stabilization circuit. Specifically, R10 is connected in series between the gate of Q4 and the positive electrode of C2 in the voltage stabilization circuit, and R10 is the gate current-limiting resistor of Q4; one end of R10 and the positive output terminal of the driving signal generation circuit are connected to the gate of Q4, the other end of R10 and the voltage stabilization circuit (specifically, the positive electrode of C2 in the voltage stabilization circuit) are connected to the drain of Q4, and the source of Q4 is connected to the switch circuit (specifically, the positive electrode of D2 in the switch circuit).

[0077] Figure 11The driving signal generating circuit in the embodiment may be a light sensing sensor, such as an IOS1 device, wherein the emitter of the IOS1 device is the positive output terminal of the driving signal generating circuit, and the emitter is the negative output terminal of the driving signal generating circuit.

[0078] exist Figure 11 In the device shown, the synchronous drive circuit functions as follows: 1) Standby energy saving control process When the external light brightness is high, the IOS1 device detects bright light, IOS1 is turned on, and current flows through the collector of IOS1. The impedance of the collector of IOS1 to the ground changes from infinity to a relatively small resistance, causing the voltage of the collector of IOS1 to the ground to be less than about 1.2V, then Q4 is disconnected, and no current flows through D2, R4 and C3, then the gate-source voltage of Q1 is 0V, and the drain-source of Q1 is disconnected. The subsequent process is the same as Figure 4 The device shown.

[0079] 2) Control process of shutting down the energy-saving standby state and starting working When the external light is dim, the IOS1 device detects dim light or no light, IOS1 is disconnected, no current flows through the collector of IOS1, the impedance of the collector of IOS1 to ground becomes infinite, and the current flows into the base of Q4 through R10, then Q4 is turned on, so that current flows through D2 and R4 to charge C3, and the subsequent process is the same as Figure 4 The device shown.

[0080] The beneficial technical effects of the embodiments of the present invention are as follows: 1. No precision devices are used, and the slow-start power supply circuit can be the power supply circuit of the power chip itself, without the need for additional standby power consumption. The overall standby power consumption of the power supply circuit can be reduced from 2~5W to within 0.1~0.2W, and the standby power is extremely low.

[0081] 2. The components are few and simple, the cost is low and the parameter design is simple.

[0082] 3. When the driving signal adopts PWM signal, a square wave control signal with a wider fluctuation frequency and a larger range of duty cycle is allowed. The frequency range is generally 1Hz~20kHz, and the duty cycle range is generally 0.5%~99.9%.

[0083] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, and all of these combinations and / or combinations fall within the scope disclosed in the present application.

[0084] In this article, specific embodiments are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention and does not limit this application. For those skilled in the art, changes can be made in the specific implementation manners and application scope according to the idea, spirit, and principle of the present invention. Any modifications, equivalent replacements, improvements, etc. made by them shall be included within the scope protected by this application.

Claims

1. A standby power-saving control device, characterized in that The device includes: a drive signal generation circuit, a soft-start power supply circuit, a voltage stabilization circuit, a switching circuit, and a unidirectional switching circuit, where: The drive signal generation circuit is connected to the switching circuit; The soft-start power supply circuit is connected to the voltage stabilization circuit, the unidirectional switching circuit, and the power input port of the power supply circuit; where the power supply circuit is the power supply circuit of the stroboscopic supplementary light; One end of the voltage stabilization circuit is connected to the soft-start power supply circuit, and the other end is connected to the switching circuit and the unidirectional switching circuit; The switching circuit includes: a first MOS transistor, a third resistor, and a third capacitor, where: the drain of the first MOS transistor is connected to the voltage stabilization circuit and the unidirectional switching circuit, the gate is connected to the drive signal generation circuit, and the source is grounded; the third resistor and the third capacitor are both connected in parallel between the gate and the source of the first MOS transistor; The unidirectional switching circuit includes: a first diode and a thyristor, where: the positive electrode of the first diode is connected to the power input port of the power supply circuit, and the negative electrode is connected to the anode of the thyristor; the anode of the thyristor is connected to the negative electrode of the first diode, the gate is connected to the voltage stabilization circuit and the switching circuit, and the cathode is grounded; When the drive signal generation circuit does not output any signal, the switching circuit is turned off, and the soft-start power supply circuit continuously outputs current to the voltage stabilization circuit, the unidirectional switching circuit, and the power input port of the power supply circuit. The unidirectional switching circuit is turned on, and the voltage at the power input port of the power supply circuit is always lower than the working voltage of the power supply circuit, realizing the standby energy-saving function.

2. The device according to claim 1, characterized in that When the drive signal generation circuit outputs a drive signal, the switching circuit is turned on, and the soft-start power supply circuit continuously outputs current to the voltage stabilization circuit, the unidirectional switching circuit, and the power input port of the power supply circuit. The unidirectional switching circuit is turned off, so that the voltage at the power input port of the power supply circuit reaches the working voltage of the power supply circuit, and thus the power supply circuit starts and enters the working state.

3. The device according to claim 1, characterized in that The soft-start power supply circuit includes: a DC power supply, a first resistor, and a first capacitor, where: One end of the first resistor is connected to the DC power supply, and the other end is connected to the voltage stabilization circuit, the unidirectional switching circuit, the positive electrode of the first capacitor, and the power input port of the power supply circuit; The positive electrode of the first capacitor is connected to the power input port of the power supply circuit, and the negative electrode is grounded.

4. The device according to claim 1, wherein The voltage stabilization circuit includes: a second resistor, a second capacitor, and a voltage stabilizing device, where: One end of the second resistor is connected to the power input port of the power supply circuit, and the other end is connected to the positive electrode of the second capacitor and the negative electrode of the voltage stabilizing device; The positive electrode of the second capacitor is connected to the negative electrode of the voltage stabilizing device, and the negative electrode of the second capacitor is grounded; The negative electrode of the voltage stabilizing device is connected to the positive electrode of the second capacitor, and the positive electrode of the voltage stabilizing device is connected to the switching circuit and the unidirectional switching circuit.

5. The device according to claim 1, characterized in that, The switching circuit further includes: a second diode, a fourth resistor, and a fifth resistor, where: The second diode is connected in series between the drive signal generation circuit and the gate of the first MOS transistor, and the positive electrode of the second diode is connected to the drive signal generation circuit, and the negative electrode of the second diode is connected to the gate of the first MOS transistor; The fourth resistor is connected in series between the drive signal generation circuit and the gate of the first MOS transistor; The fifth resistor is connected in series between the voltage stabilization circuit and the drain of the first MOS transistor.

6. The device according to claim 1, characterized in that The unidirectional switch circuit further includes: a third diode, a fourth diode, a sixth resistor, and a seventh resistor, where: The third diode is connected in series between the working port of the power supply circuit and the anode of the thyristor. Among them, the positive electrode of the third diode is connected to the working port of the power supply circuit, and the negative electrode is connected to the anode of the thyristor; The fourth diode is connected in series between the voltage stabilizing circuit and the gate of the thyristor, and the positive electrode of the fourth diode is connected to the voltage stabilizing circuit and the switch circuit, and the negative electrode is connected to the gate of the thyristor; One end of the sixth resistor is connected to the gate of the thyristor, and the other end is grounded; The seventh resistor is connected in series between the power input port of the power supply circuit and the negative electrode of the first diode.

7. The device according to claim 1, characterized in that, The device further includes: a synchronous drive circuit, and, The synchronous drive circuit includes: an eighth resistor and a first triode, where: the eighth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the base of the first triode; the base of the first triode is connected to the eighth resistor, the collector is connected to the voltage stabilizing circuit, and the emitter is connected to the switch circuit; Alternatively, the synchronous drive circuit includes: an eighth resistor and a second MOS transistor, where: the eighth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the gate of the second MOS transistor; the gate of the second MOS transistor is connected to the eighth resistor, the drain is connected to the voltage stabilizing circuit, and the source is connected to the switch circuit.

8. The device according to claim 7, characterized in that, The synchronous drive circuit further includes: a fifth diode, where the fifth diode is connected in series between the positive output terminal of the drive signal generation circuit and the eighth resistor, and the positive electrode of the fifth diode is connected to the positive output terminal of the drive signal generation circuit, and the negative electrode of the fifth diode is connected to the eighth resistor.

9. The device according to claim 1, wherein The device further includes: an isolation drive circuit, and, The isolation drive circuit includes: a ninth resistor and a unidirectional optocoupler, where: The ninth resistor is connected in series between the positive output terminal of the drive signal generation circuit and the positive electrode of the primary side of the unidirectional optocoupler; The positive electrode of the primary side of the unidirectional optocoupler is connected to the ninth resistor, the negative electrode of the primary side is connected to the negative output terminal of the drive signal generation circuit, the collector of the secondary side is connected to the voltage stabilizing circuit, and the emitter of the secondary side is connected to the switch circuit.

10. The device according to claim 9, characterized in that, The isolation drive circuit further includes: a sixth diode, and the sixth diode is connected in series between the negative output terminal of the drive signal generation circuit and the negative electrode of the primary side of the unidirectional optocoupler. Among them, the positive electrode of the sixth diode is connected to the negative electrode of the primary side of the unidirectional optocoupler, and the negative electrode of the sixth diode is connected to the negative output terminal of the isolation drive circuit.

11. The device according to any one of claims 1 to 10, characterized in that, The drive signal generation circuit is a pulse width modulation signal generation circuit.

12. The device according to claim 1, wherein The device further includes: a synchronous drive circuit, and, The synchronous drive circuit includes: a tenth resistor and a second triode, where: the tenth resistor is connected in series between the base of the second triode and the voltage stabilizing circuit; the base of the second triode is connected to the drive signal generation circuit and one end of the tenth resistor, the collector is connected to the other end of the tenth resistor and the voltage stabilizing circuit, and the emitter is connected to the switch circuit; Alternatively, the synchronous drive circuit includes: a tenth resistor and a third MOS transistor, where: the tenth resistor is connected in series between the gate of the third MOS transistor and the voltage stabilization circuit; the gate of the third MOS transistor is connected to the drive signal generation circuit and one end of the tenth resistor, the drain is connected to the other end of the tenth resistor and the voltage stabilization circuit, and the source is connected to the switch circuit.

13. The device according to claim 12, characterized in that, The drive signal generation circuit is a light sensor.

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