Standby energy-saving control device

Abstract

An embodiment of the present invention provides a standby energy-saving control device. The device includes: a drive signal generating circuit connected to a switch circuit; a slow-start power supply circuit connected to a voltage stabilizing circuit, a unidirectional switch circuit, and a power input port of a power supply circuit; a voltage stabilizing circuit, one end of which is connected to the slow-start power supply circuit and the other end of which is connected to the switch circuit and the unidirectional switch circuit; a switch circuit, one end of which is connected to the drive signal generating circuit, one end of which is connected to the voltage stabilizing circuit, and another end of which is connected to the unidirectional switch circuit; and a unidirectional switch circuit, one end of which is connected to the switch circuit and the voltage stabilizing circuit and the other end of which is connected to the power input port of the power supply circuit. The embodiment of the present invention implements standby energy-saving control of the power supply circuit of a strobe fill light, thereby reducing the standby power consumption of the strobe fill light.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a standby energy-saving control device for a power supply circuit of a strobe fill light. Background Art

[0002] Currently, LED (Light-Emitting Diode) strobe fill lights are used in many scenarios. They provide supplemental lighting for snapshot cameras using a specific light source when light levels are low. LED strobe fill lights are rarely used during the day, remaining in standby mode for nearly 12 hours a day. However, their current standby power consumption is between 2 and 3 watts, resulting in significant energy waste. Summary of the Invention

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

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] A standby energy-saving control device includes: a drive signal generating circuit, a slow-start power supply circuit, a voltage stabilizing circuit, a switch circuit, and a unidirectional switch circuit, wherein:

[0006] A driving signal generating circuit is connected to the switching circuit;

[0007] A slow-start power supply circuit is connected to the voltage stabilizing circuit, the one-way switch circuit, and the power input port of the power supply circuit; wherein the power supply circuit is the power supply circuit of the strobe fill light;

[0008] A voltage stabilizing circuit, one end of which is connected to the slow-start power supply circuit, and the other end of which is connected to the switch circuit and the one-way switch circuit;

[0009] The switch circuit includes: a first MOS transistor, a third resistor, and a third capacitor, wherein: the drain of the first MOS transistor is connected to the voltage stabilizing circuit and the unidirectional switch circuit, the gate is connected to the drive signal generating circuit, and the source is grounded; the third resistor and the third capacitor are both connected in parallel between the gate and source of the first MOS transistor;

[0010] The unidirectional switch circuit includes: a first diode and a thyristor, wherein: the positive electrode of the first diode is connected to the power input port of the power 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 stabilizing circuit and the switch circuit, and the cathode is grounded;

[0011] When the driving signal generating circuit does not output any signal, the switching circuit is disconnected, and the slow-start power supply circuit continues to output current to the voltage stabilizing 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 of the power input port of the power supply circuit is always lower than the operating voltage of the power supply circuit, thereby realizing the standby energy-saving function.

[0012] When the drive signal generating circuit outputs the drive signal, the switch circuit is turned on, and the slow-start power supply circuit continues to output current to the voltage stabilizing circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is disconnected, so that the voltage of the power input port of the power supply circuit reaches the operating voltage of the power supply circuit, thereby starting the power supply circuit and entering the working state.

[0013] The soft start power supply circuit includes: a DC power supply, a first resistor and a first capacitor, wherein:

[0014] One end of the first resistor is connected to a DC power supply, and the other end is connected to the voltage stabilizing circuit, the unidirectional switch circuit, the positive electrode of the first capacitor and the power input port of the power supply circuit;

[0015] The positive electrode of the first capacitor is connected to the power input port of the power circuit, and the negative electrode is grounded.

[0016] The voltage stabilizing circuit includes: a second resistor, a second capacitor and a voltage stabilizing device, wherein:

[0017] One end of the second resistor is connected to the power input port of the power circuit, and the other end is connected to the positive electrode of the second capacitor and the negative electrode of the voltage stabilizing device;

[0018] 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;

[0019] 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 switch circuit and the unidirectional switch circuit.

[0020] The switch circuit further comprises: a second diode, a fourth resistor and a fifth resistor, wherein:

[0021] The second diode is connected in series between the drive signal generating circuit and the gate of the first MOS transistor, with the anode of the second diode connected to the drive signal generating circuit and the cathode of the second diode connected to the gate of the first MOS transistor;

[0022] A fourth resistor is connected in series between the driving signal generating circuit and the gate of the first MOS transistor;

[0023] The fifth resistor is connected in series between the voltage stabilizing circuit and the drain of the first MOS transistor.

[0024] The unidirectional switch circuit further comprises: a third diode, a fourth diode, a sixth resistor and a seventh resistor, wherein:

[0025] A third diode is connected in series between the working port of the power supply circuit and the anode of the thyristor, wherein the anode of the third diode is connected to the working port of the power supply circuit, and the cathode is connected to the anode of the thyristor;

[0026] A fourth diode is connected in series between the voltage stabilizing circuit and the gate of the thyristor, with the anode of the fourth diode connected to the voltage stabilizing circuit and the switch circuit, and the cathode of the fourth diode connected to the gate of the thyristor;

[0027] One end of the sixth resistor is connected to the gate of the thyristor, and the other end is grounded;

[0028] The seventh resistor is connected in series between the power input port of the power circuit and the cathode of the first diode.

[0029] The device further includes: a synchronous drive circuit, and the synchronous drive circuit includes: an eighth resistor and a first transistor, wherein: the eighth resistor is connected in series between the positive output terminal of the drive signal generating circuit and the base of the first transistor; the base of the first transistor is connected to the eighth resistor, the collector is connected to the voltage stabilizing circuit, and the emitter is connected to the switching circuit;

[0030] Alternatively, the synchronous drive circuit includes: an eighth resistor and a second MOS transistor, wherein: the eighth resistor is connected in series between the positive output end of the drive signal generating 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 switching circuit.

[0031] The synchronous driving circuit further includes: a fifth diode, wherein the fifth diode is connected in series between the positive output terminal of the driving signal generating circuit and the eighth resistor, and the anode of the fifth diode is connected to the positive output terminal of the driving signal generating circuit, and the cathode of the fifth diode is connected to the eighth resistor.

[0032] The device further comprises: an isolation drive circuit, and

[0033] The isolation driving circuit includes: a ninth resistor and a unidirectional optical coupler, wherein:

[0034] The ninth resistor is connected in series between the positive output terminal of the driving signal generating circuit and the positive electrode of the primary side of the unidirectional optocoupler;

[0035] 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 generating 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 switching circuit.

[0036] 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 generating circuit and the negative electrode of the primary side of the unidirectional optocoupler, wherein 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.

[0037] The driving signal generating circuit is a pulse width modulation signal generating circuit.

[0038] The device further comprises: a synchronous driving circuit, and

[0039] The synchronous driving circuit includes: a tenth resistor and a second triode, wherein: 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 driving signal generating 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 switching circuit;

[0040] Alternatively, the synchronous drive circuit includes: a tenth resistor and a third MOS transistor, wherein: the tenth resistor is connected in series between the gate of the third MOS transistor and the voltage stabilizing circuit; the gate of the third MOS transistor is connected to the drive signal generating circuit and one end of the tenth resistor, the drain is connected to the other end of the tenth resistor and the voltage stabilizing circuit, and the source is connected to the switching circuit.

[0041] The driving signal generating circuit is a light sensor.

[0042] In the above embodiment, by adding a driving signal generating circuit, a voltage stabilizing circuit, a switching circuit and a unidirectional switching circuit, and the switching circuit includes: a first MOS tube, a third resistor and a third capacitor, and the unidirectional switching circuit includes: a first diode and a thyristor, standby energy-saving control of the power supply circuit of the strobe fill light is achieved, thereby reducing the standby power consumption of the strobe fill light. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic structural diagram of a standby energy-saving control device provided by an embodiment of the present invention;

[0045] Figure 2 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0046] Figure 3A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0047] Figure 4 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0048] Figure 5 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0049] Figure 6 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0050] Figure 7 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0051] Figure 8 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0052] Figure 9 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0053] Figure 10 A schematic structural diagram of a standby energy-saving control device provided by another embodiment of the present invention;

[0054] Figure 11 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the present invention and in the drawings described above are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0057] Figure 1 This is a structural diagram of a standby energy-saving control device provided by an embodiment of the present invention. Figure 1 As shown, the device mainly includes: a drive signal generating circuit, a slow start power supply circuit, a voltage stabilizing circuit, a switch circuit and a unidirectional switch circuit, wherein:

[0058] 1) Driving signal generating circuit

[0059] Connected to the switching circuit. Used to generate a driving signal and output it to the switching circuit.

[0060] 2) Slow start power supply circuit

[0061] Connected to the power input port of the voltage stabilizing circuit, the one-way switch circuit, and the power supply circuit. Used to: supply power to the voltage stabilizing circuit, the one-way switch circuit, and the power supply circuit.

[0062] The power circuit is located inside the controlled device. Examples of controlled devices include strobe lights, specifically LED strobe lights. The power circuit typically consists of the switching power supply's control chip and its peripheral hardware.

[0063] 3) Voltage stabilization circuit

[0064] One end is connected to the slow-start power supply circuit, and the other end is connected to the switch circuit and the unidirectional switch circuit. It is used to: perform voltage regulation control based on the current input from the slow-start power supply circuit, thereby providing a stable driving voltage for the switch circuit and providing current for the unidirectional switch circuit.

[0065] 4) Switching circuit

[0066] One end is connected to the drive signal generating circuit, one end is connected to the voltage stabilizing circuit, and the other end is connected to the unidirectional switch circuit. It is used to disconnect or connect according to the drive signal input from the drive signal generating circuit and the drive voltage provided by the voltage stabilizing circuit, thereby controlling the unidirectional switch circuit to be turned on or off.

[0067] Among them, the specific structure of the switching circuit can be as follows Figure 2 As shown, the switch circuit includes: a first MOS tube (metal-oxide-semiconductor field-effect transistor) Q1, a third resistor R3 and a third capacitor C3, wherein: the drain of Q1 is connected to the voltage stabilizing circuit and the unidirectional switch circuit, the gate is connected to the drive signal generating circuit, and the source is grounded; R3 and C3 are both connected in parallel between the gate and source of Q1, R3 is the bias resistor of the gate and source of Q1, C3 is the energy storage capacitor, and R5 is the current limiting resistor of the drain current of Q1.

[0068] 5) One-way switch circuit

[0069] One end is connected to the switching circuit and the voltage stabilizing circuit, and the other end is connected to the power input port of the power supply circuit. It is used to: turn on or off according to the switching state of the switching circuit and the current input by the voltage stabilizing circuit, thereby controlling the power supply voltage of the power supply circuit, so that the power supply circuit enters the standby energy-saving or working state.

[0070] Among them, the specific structure of the unidirectional switch circuit can be as follows Figure 2 As shown, the unidirectional switch circuit includes: a first diode D1 and a thyristor Q2, wherein: 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 level is connected to the voltage regulator circuit and the switch circuit, and the cathode is grounded. D1 and Q2 form a short-circuit control channel 1 to control the V CC port, in standby energy saving control, the power circuit V CC The voltage of the port is pulled down so that the power chip does not work due to undervoltage.

[0071] Figure 1 The device shown realizes standby energy saving and startup operation control of the power circuit through the following process:

[0072] 1. Standby energy saving control

[0073] When the power supply circuit is to enter the standby energy-saving state, the drive signal generating circuit is first controlled not to output any signal, so that no current enters the switch circuit, the switch circuit is disconnected, and the slow-start power supply circuit continues to output current to the voltage stabilizing 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 of the power input port of the power supply circuit is always lower than the operating voltage of the power supply circuit, thereby realizing the standby energy-saving function.

[0074] 2. Start work control

[0075] When the power supply circuit is to be started and enter the working state, the drive signal generating circuit is first controlled to output the drive signal, then the switch circuit is turned on, and the slow-start power supply circuit continuously outputs current to the voltage stabilizing circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is disconnected, so that the voltage of the power input port of the power supply circuit reaches the working voltage of the power supply circuit, thereby starting the power supply circuit and entering the working state.

[0076] In the above embodiment, by adding a driving signal generating circuit, a voltage stabilizing circuit, a switching circuit and a unidirectional switching circuit, and the switching circuit includes: a first MOS tube, a third resistor and a third capacitor, and the unidirectional switching circuit includes: a first diode and a thyristor, standby energy saving and startup operation control of the power supply circuit of the controlled device (such as: a strobe fill light) are achieved, thereby reducing the standby power consumption of the controlled device (such as: a strobe fill light).

[0077] Figure 2 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 2 As shown:

[0078] 1) Slow start power supply circuit includes: DC power supply V DC , a first resistor R1 and a first capacitor C1, wherein:

[0079] One end of R1 is connected to V DC The other end is connected to the voltage stabilizing circuit, the one-way switch circuit, the positive electrode of C1 and the power input port V CC , the resistance value of R1 is generally selected between 500~1000kΩ (kilo-ohm);

[0080] The positive terminal of C1 is connected to V CC , the negative pole is grounded.

[0081] V DC It can be the DC voltage after the AC voltage passes through the rectifier bridge, or it can be the DC voltage.

[0082] 2) The voltage stabilizing circuit includes: a second resistor R2, a second capacitor C2 and a voltage stabilizing device ZD1, wherein:

[0083] One end of R2 is connected to V CC , the other end is connected to the positive electrode of C2 and the negative electrode of ZD1;

[0084] The positive pole of C2 is connected to the negative pole of ZD1, and the negative pole of C2 is grounded;

[0085] 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.

[0086] In an optional embodiment, ZD1 may be a Zener diode.

[0087] 3) The switch circuit includes: a first MOS transistor (metal-oxide-semiconductor field-effect transistor) Q1, a third resistor R3, and a third capacitor C3, wherein:

[0088] The drain of Q1 is connected to the voltage stabilizing circuit and the unidirectional switch circuit, the gate is connected to the driving signal generating circuit, and the source is grounded;

[0089] R3 and C3 are both connected in parallel between the gate and 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.

[0090] 4) The unidirectional switch circuit includes: a first diode D1 and a thyristor Q2, wherein:

[0091] The positive terminal of D1 is connected to V CC , the negative electrode is connected to the anode of Q2;

[0092] The anode of Q2 is connected to the negative electrode of D1, the gate level is connected to the voltage regulator circuit and the switch circuit, and the cathode is grounded.

[0093] D1 and Q2 form a short-circuit control channel 1 to control the V CC port, in standby energy saving control, the power circuit V CC The voltage of the port is pulled down so that the power chip does not work due to undervoltage.

[0094] Figure 2 The device shown realizes standby energy saving and startup operation control of the power circuit through the following process:

[0095] 1. Standby energy saving control

[0096] When the power supply circuit is to enter the standby state, the drive signal generating circuit is first controlled not to output any signal, so that no current enters the switch circuit and the switch circuit is disconnected;

[0097] Because the DC power supply V DCThere is a continuous DC voltage, generally between 80 and 500V (volts). The 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. The voltage across C2 is stabilized between 7 and 10V. In addition, the capacity of C1 is much larger than that of C2, and the resistance of R1 is much larger than that of R2. Resistance, 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 the voltage difference increases, the current flowing through R2 also increases. This current flows through ZD1 and the gate of 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 across C1 V CC It is still lower than the working voltage of the power circuit, the power circuit remains in the non-working state, Q2 is turned on, the anode of Q2 is pulled down to 0V, and the V CC Quick discharge, V CC Pull low, when V CC Pull it down low enough so that the current flowing through the anode of Q2 is less than the holding current of Q2, Q2 will be disconnected, and the voltage across C1 and C2 will be slowly recharged by R1 and R2, and the above process will be repeated. CC Since it is always lower than the operating voltage of the power supply circuit, the power supply circuit always remains in a non-operating state, and the power consumption of the power supply circuit is very low.

[0098] 2. Turn off the standby energy saving function, that is, let the power circuit start and work normally

[0099] When the power circuit is to be shut down from the standby energy-saving state and start to enter the normal working state, the driving signal generating circuit is first controlled to output a square wave signal with a continuous duty cycle. Generally, the high level of the square wave signal is between 4 and 20V.

[0100] V DC The output DC current continuously passes through R1 and R2, charging C1 and C2 respectively.

[0101] A square wave signal with a continuous duty cycle periodically switches between high and low levels, resulting in a periodic current charging C3. C3 has a large capacitance, typically 1-10µf (microfarads), and R3's resistance is typically 1-10MΩ (megaohms). R3 discharges C3 very slowly, and after a few cycles, Q1's gate-source voltage rapidly rises to the turn-on threshold voltage, turning on. Q1 remains on for a long time, keeping Q1's drain voltage at 0V. Typically, Q1's turn-on threshold voltage is 3V-4V. That is, when the voltage across C2 slowly rises to around 3V-4V, Q1 turns on, and Q1's drain voltage remains at 0V. Consequently, Q2 has no gate drive current, meaning the gate trigger current flowing into Q2 is 0A (amperes), causing Q2 to remain off. C1 is then continuously charged by R1 to reach the operating voltage of the power supply circuit, typically 16V-18V. Then the power circuit can start and work normally, that is, the standby energy saving function is turned off.

[0102] Visible, through Figure 2 The device shown can control the standby energy saving and startup work 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 reducing the standby power consumption from 2~5W (watts) to within 0.1~0.2W.

[0103] Figure 3 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 3 As shown, the device Figure 2 The device shown is compared to:

[0104] a) The switch circuit further comprises: a second diode D2

[0105] D2 is connected in series between the driving signal generating circuit and the gate of Q1 , with the positive electrode of D2 connected to the driving signal generating circuit and the negative electrode of D2 connected to the gate of Q1 .

[0106] The function of D2 is to prevent the current from flowing from the switching circuit into the drive signal generating circuit.

[0107] 2) The unidirectional switch circuit further includes: a third diode D3

[0108] D3 is connected in series between the working port COMP of the power circuit and the anode of the thyristor Q2. Specifically, the positive electrode of D3 is connected to the COMP port of the power circuit, and the negative electrode is connected to the anode of Q2.

[0109] D3 forms short-circuit control channel 2, which controls the COMP port of the power circuit during standby energy-saving control, pulling down the voltage at the COMP port and immediately shutting down the power chip. Specifically, during energy-saving control of the power circuit, when Q2 turns on, causing the anode voltage of Q2 to drop to 0V, the voltage at the COMP port of the power circuit is pulled down through D3, causing the power circuit to immediately stop operating.

[0110] Figure 4 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 4 As shown, the device Figure 2 and Figure 3 The device shown is compared to:

[0111] 1) The switch circuit further includes: a fourth resistor R4 and / or a fifth resistor R5

[0112] Among them, Figure 2 Compared with the device shown in FIG, R4 is connected in series between the drive signal generating circuit and the gate of Q1; Figure 3 Compared to the device shown, R4 is connected in series between the cathode of D2 and the gate of Q1.

[0113] 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 .

[0114] 2) The unidirectional switch circuit further includes: a fourth diode D4 and / or a sixth resistor R6 and / or a seventh resistor R7, wherein:

[0115] D4 is connected in series between the voltage regulator circuit and the gate of Q2, with the positive electrode of D4 connected to the voltage regulator circuit and the switch circuit, and the negative electrode connected to the gate of Q2; specifically, D4 is connected in series between the positive electrode of ZD1 and the gate of Q2;

[0116] One end of R6 is connected to the gate of Q2, and the other end is grounded. R6 is the discharge resistor between the gate and cathode of Q2;

[0117] R7 is connected in series with V CC Between the port and the negative terminal of D1.

[0118] D4 can increase the voltage threshold that makes Q2 turn on. For example, if the original gate enable voltage of Q2 is 0.4V, by connecting D4 in series in the gate circuit of Q2, the gate enable voltage of Q2 can be increased to about 1V.

[0119] Figure 4 The device shown realizes standby energy saving and startup operation control of the power circuit through the following process:

[0120] 1. Standby energy saving control

[0121] When the power supply circuit is to enter the standby energy-saving state, the driving signal generating circuit is first controlled not to output any signal, so that no current enters the switch circuit and the switch circuit is disconnected;

[0122] Because the DC power supply V DC There is a continuous DC voltage, generally between 80 and 500V (volts). The 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. The voltage across C2 is stabilized between 7 and 10V. In addition, the capacity of C1 is much larger than that of C2, and the resistance of R1 is much larger than that of R2. , as the voltage across C2 rises to the clamping voltage of ZD1, the voltage across C2 stops rising. 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 the voltage difference increases, the current flowing through R2 also increases. This current flows through ZD1, D4 and the gate of Q2 in turn. 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 is CC It is still lower than the working voltage of the power circuit, the power circuit remains in the non-working state, Q2 is turned on, the anode of Q2 is pulled down to 0V, and the COMP pin of the power circuit is pulled down through D3, so that the power circuit stops working immediately. At the same time, the V pin of the power circuit is given to the power circuit through the D1 channel. CC Quick discharge, V CC Pull low, when V CC If the voltage is pulled low enough, the current flowing through the anode of Q2 will be less than the holding current of Q2, and Q2 will be disconnected, allowing the voltage across C1 and C2 to be slowly recharged by R1 and R2, and the above process will be repeated. Among them, R7 is a current limiting resistor, which can prevent excessive current from flowing through Q2 and causing damage to Q2. During this stage, the V CC Since it is always lower than the operating voltage of the power supply circuit, the power supply circuit always remains in a non-operating state, and the power consumption of the power supply circuit is very low.

[0123] 2. Turn off the standby energy saving function, that is, let the power circuit start and work normally

[0124] When the power circuit is to be shut down from the standby energy-saving state and start to enter the normal working state, the driving signal generating circuit is first controlled to output a square wave signal with a continuous duty cycle. Generally, the high level of the square wave signal is between 4 and 20V.

[0125] V DC The output DC current continuously passes through R1 and R2, charging C1 and C2 respectively.

[0126] The square wave signal with a continuous duty cycle periodically switches between high and low levels. Therefore, a periodic current flows through D2 and R4 to charge C3. Among them, the capacity of C3 is relatively large, generally 1~10µf (microfarad), the resistance value of R4 is generally 10~20Ω (ohm), and the resistance value of R3 is generally 1~10MΩ (megaohm). The current through R4 quickly charges C3, but the discharge current of R3 to C3 is very slow. After a few cycles, the gate-source voltage of Q1 quickly rises to the turn-on threshold voltage, and Q1 turns on. Q1 will remain on for a long time, keeping its drain voltage at 0V. Q1's turn-on threshold voltage is typically 3V to 4V. That is, when the voltage across C2 slowly rises to around 3V to 4V, Q1 turns on, its drain voltage remains at 0V, and D4 turns off. This means Q2 has no gate drive current, resulting in a gate trigger current of 0A (amperes). Q2 then remains off, and C1 is continuously charged by R1 to reach the operating voltage of the power circuit, typically 16V to 18V. The power circuit can then start and operate normally, effectively turning off the standby energy-saving function.

[0127] Visible, through Figure 4 The device shown can control the standby energy saving and startup work 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 reducing the standby power consumption from 2~5W (watts) to within 0.1~0.2W.

[0128] Figure 5 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 5 As shown, the device Figure 1 Compared with the device shown in FIG, a synchronous drive circuit is added, wherein:

[0129] One end of the synchronous drive circuit is connected to the drive signal generating circuit, one end is connected to the voltage stabilizing circuit, and another end is connected to the switch circuit. The synchronous drive circuit is used to turn on or off according to the drive signal output by the drive signal generating circuit and the voltage output by the voltage stabilizing circuit, thereby controlling the switch circuit to be turned on or off.

[0130] Figure 6 This is a structural diagram of an energy-saving control device provided by another embodiment of the present invention. Figure 6 As shown, the synchronous driving circuit at least includes: an eighth resistor R8 and a first transistor Q3, wherein:

[0131] R8 is connected in series between the positive output terminal of the drive signal generating circuit and the base of Q3. At this time, the negative terminal of the drive signal generating circuit is grounded, and R8 is the base current limiting resistor of Q3.

[0132] The base of Q3 is connected to R8; the collector of Q3 is connected to the voltage regulator circuit, such as Figure 6 As shown, the collector of Q3 is connected to C2 in the voltage regulator circuit; the emitter of Q3 is connected to the switch circuit, as shown Figure 6 As shown, the emitter of Q3 is connected to the positive terminal of D2 in the switch circuit. Q3 can be an NPN transistor.

[0133] In practical applications, Q3 can also be a second MOS transistor. In this case, R8 is connected in series between the positive output terminal of the drive signal generating circuit and the gate of Q3. The negative terminal of the drive signal generating circuit is grounded. R8 serves as the gate current-limiting resistor of Q3. The gate of Q3 is connected to R8. The drain of Q3 is connected to the voltage regulator circuit, specifically, C2 in the voltage regulator circuit. The source of Q3 is connected to the switch circuit, specifically, the positive terminal of D2 in the switch circuit.

[0134] like Figure 6 As shown, the synchronous driving circuit may further include: a fifth diode D5, wherein D5 is connected in series between the positive output terminal of the driving signal generating circuit and R8. Specifically, the positive electrode of D5 is connected to the positive output terminal of the driving signal generating circuit, and the negative electrode is connected to R8.

[0135] exist Figure 6 In the device shown, the synchronous drive circuit functions as follows:

[0136] 1) During the standby energy-saving control process, since the drive signal generating circuit has no signal output, that is, the voltage between the positive and negative output ports is 0V, there is no current in the base of Q3, Q3 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.

[0137] 2) When the standby energy-saving state is turned off and the work is started, the driving signal generating circuit outputs a square wave signal with a continuous duty cycle. At this time, the base of Q3 periodically has and does not have current, and Q3 periodically turns on and off. The collector current of Q3 is the amplified current of the base current of Q3, which is generally tens to hundreds of times. Therefore, there is a periodic current flowing through D2 and R4 to charge C3. The subsequent process is the same as Figure 4 The device shown.

[0138] Figure 7 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 7 As shown, the device Figure 1 Compared with the device shown in the figure, an isolated drive circuit is added, wherein:

[0139] One end of the isolation drive circuit is connected to the drive signal generating circuit, one end is connected to the voltage stabilizing circuit, and the other end is connected to the switching circuit, which is used to: turn on or off according to the drive signal output by the drive signal generating circuit and the voltage output by the voltage stabilizing circuit, thereby controlling the switching circuit to be turned on or off.

[0140] Figure 8 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 8 As shown, the isolation driving circuit at least includes: a ninth resistor R9 and a unidirectional optical coupler OP1, wherein:

[0141] R9 is connected in series between the positive output terminal of the driving signal generating circuit and the positive electrode of the primary side of OP1. R9 is the current limiting resistor of the forward current of OP1.

[0142] 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 generating 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 switching circuit; Figure 8 As shown, the collector of the secondary side of OP1 is connected to the positive electrode of C2 in the voltage stabilizing circuit, and the emitter of the secondary side is connected to the positive electrode of D2 in the switching circuit.

[0143] like Figure 8 As shown, the isolation drive circuit may further include a sixth diode D6, wherein D6 is connected in series between the negative output terminal of the drive signal generating circuit and the cathode of the primary side of OP1. Specifically, the anode of D6 is connected to the cathode of the primary side of OP1, and the cathode 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 generating circuit. The function of D6 is to prevent R8 of the isolation drive circuit and the cathode of the primary side of OP1 from being reversely connected to the positive and negative output terminals of the drive signal generating circuit, thereby damaging OP1.

[0144] exist Figure 8 In the device shown, the isolation driver circuit performs the following functions:

[0145] 1) During the standby energy-saving control process, since the drive signal generating circuit has no signal output, that is, the voltage between the positive and negative output terminals is 0V, there is no current on the primary side of OP1, and no current on the secondary side of OP1, so 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.

[0146] 2) When the standby energy-saving state is turned off and the work is started, the driving signal generating circuit outputs a square wave signal with a continuous duty cycle. At this time, the primary side of OP1 periodically has and has no current, and the secondary side of OP1 periodically has and has no current. Therefore, there is a periodic current flowing through D2 and R4 to charge C3. The subsequent process is the same as Figure 4 The device shown.

[0147] Figure 9 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 9 As shown, the device Figure 1 Compared with the device shown in FIG, an isolation drive circuit and a synchronous drive circuit are added, wherein:

[0148] One end of the isolation drive circuit is connected to the drive signal generating circuit, and the other end is connected to the synchronous drive circuit; one end of the synchronous drive circuit is connected to the isolation drive circuit, one end is connected to the voltage stabilizing circuit, and the other end is connected to the switching circuit.

[0149] The isolation drive circuit is used to turn on or off according to the drive signal output by the drive signal generating circuit, thereby controlling the synchronous drive circuit to turn on or off.

[0150] The synchronous drive circuit is used to turn on or off according to the current output by the isolation drive circuit and the voltage output by the voltage stabilizing circuit, thereby controlling the switching circuit to turn on or off.

[0151] Figure 10 This is a structural diagram of a standby energy-saving control device provided by another embodiment of the present invention. Figure 10 As shown: the isolation drive circuit at least includes: a ninth resistor R9 and a unidirectional optical coupler OP1, and the synchronous drive circuit includes: an eighth resistor R8 and a first transistor Q3, wherein:

[0152] R9 is connected in series between the positive output terminal of the driving signal generating circuit and the positive electrode of the primary side of OP1;

[0153] 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 generating 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;

[0154] R8 is connected in series between the emitter of the secondary side of OP1 and the base of Q3 in the isolation drive circuit;

[0155] 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 regulator circuit; the emitter of Q3 is connected to the positive electrode of D2 in the switch circuit.

[0156] The isolation driving circuit further includes: a sixth diode D6, and D6 is connected in series between the negative output terminal of the driving signal generating circuit and the negative electrode of the primary side of OP1, wherein 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.

[0157] exist Figure 10In the device shown, the functions of the isolation drive circuit and the synchronization drive circuit are as follows:

[0158] 1) During the standby energy-saving control process, since the drive signal generating circuit has no signal output, that is, the voltage between the positive and negative output terminals is 0V, there is no current on the primary side of OP1, and no current on the secondary side of OP1, so there is no current on the base of Q3, and Q3 is disconnected, so 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.

[0159] 2) In the process of shutting down the standby energy-saving state and starting the work, since the driving signal generating circuit outputs a square wave signal with a continuous duty cycle, the primary side of OP1 periodically has and has no current, and the secondary side of OP1 periodically has and has no current, then the base of Q3 periodically has and has no current, Q3 periodically turns on and off, and the collector current of Q3 is the amplified current of the base current of Q3, which is generally tens to hundreds of times. Therefore, there is a periodic current flowing through D2 and R4 to charge C3, and the subsequent process is the same. Figure 4 The device shown.

[0160] Figures 1 to 10 The drive signal generating circuit in the illustrated device can be a PWM (Pulse Width Modulation) generating circuit. In this embodiment of the present invention, a square wave control signal with a wide frequency range and a wide duty cycle variation is permitted. The frequency range is typically 1 Hz to 20 kHz (kilohertz), and the duty cycle range is typically 0.5% to 99.9%.

[0161] Figure 11 A schematic diagram of the structure of a standby energy-saving control device provided by another embodiment of the present invention is provided. Figure 5 Another structure of the synchronous driving circuit in the device shown. Figure 11 As shown, the synchronous driving circuit includes: a tenth resistor R10 and a second transistor Q4, wherein:

[0162] R10 is connected in series between the base of Q4 and the voltage regulator circuit. Specifically, Figure 11 As shown, R10 is connected in series between the base of Q4 and the positive electrode of C2 in the voltage stabilizing circuit. R10 is the base current limiting resistor of Q4.

[0163] The base of Q4 is connected to one end of R10 and the positive output end of the drive signal generating circuit, the collector is connected to the other end of R10 and the voltage stabilizing circuit (specifically, the positive electrode of C2 in the voltage stabilizing circuit), and the emitter is connected to the switching circuit (specifically, the positive electrode of D2 in the switching circuit).

[0164] In practical applications, Q4 can also be a third MOS transistor. In this case, R10 is connected in series between Q4's gate and the voltage regulator circuit. Specifically, R10 is connected in series between Q4's gate and the positive electrode of C2 in the voltage regulator circuit. R10 is Q4's gate current-limiting resistor. Q4's gate is connected to one end of R10 and the positive output terminal of the drive signal generating circuit, its drain is connected to the other end of R10 and the voltage regulator circuit (specifically, the positive electrode of C2 in the voltage regulator circuit), and its source is connected to the switch circuit (specifically, the positive electrode of D2 in the switch circuit).

[0165] Figure 11 The driving signal generating circuit in the embodiment may be a light 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.

[0166] exist Figure 11 In the device shown, the synchronous drive circuit functions as follows:

[0167] 1) Standby energy saving control process

[0168] When the external light brightness is high, the IOS1 device detects the 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. 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.

[0169] 2) Control process of shutting down the energy-saving standby state and starting work

[0170] 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.

[0171] The beneficial technical effects of the embodiments of the present invention are as follows:

[0172] 1. No precision components are used, and the soft-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.

[0173] 2. The components are few and simple, the cost is low and the parameter design is simple.

[0174] 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%.

[0175] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in this application. In particular, without departing from the spirit and teachings of this application, the features described in the various embodiments and / or claims of this application may be combined and / or coupled in various ways, and all such combinations and / or couplings fall within the scope of this application.

[0176] The principles and implementation methods of the present invention are described herein using specific embodiments. The description of the above embodiments is only used to help understand the core ideas of the present invention and is not intended to limit this application. For those skilled in the art, changes can be made in the specific implementation methods and application scope based on the ideas, spirit and principles of the present invention. Any modifications, equivalent replacements, improvements, etc. made therein should be included within the scope of protection of this application.

Claims

1. A standby energy-saving control device, characterized in that: The device includes: a driving signal generating circuit, a slow-start power supply circuit, a voltage stabilizing circuit, a switching circuit and a unidirectional switching circuit, wherein: A driving signal generating circuit is connected to the switching circuit; A slow-start power supply circuit is connected to the voltage stabilizing circuit, the one-way switch circuit, and the power input port of the power supply circuit; wherein the power supply circuit is the power supply circuit of the strobe fill light; A voltage stabilizing circuit, one end of which is connected to the slow-start power supply circuit, and the other end of which is connected to the switch circuit and the one-way switch circuit; The switch circuit includes: a first MOS transistor, a third resistor, and a third capacitor, wherein: the drain of the first MOS transistor 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; the third resistor and the third capacitor are both connected in parallel between the gate and source of the first MOS transistor; The unidirectional switch circuit includes: a first diode and a thyristor, wherein: the positive electrode of the first diode is connected to the power input port of the power 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 stabilizing circuit and the switch circuit, and the cathode is grounded; When the driving signal generating circuit does not output any signal, the switching circuit is disconnected, and the slow-start power supply circuit continues to output current to the voltage stabilizing 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 of the power input port of the power supply circuit is always lower than the operating voltage of the power supply circuit, thereby realizing the standby energy-saving function.

2. The device according to claim 1, characterized in that When the drive signal generating circuit outputs the drive signal, the switch circuit is turned on, and the slow-start power supply circuit continues to output current to the voltage stabilizing circuit, the unidirectional switch circuit, and the power input port of the power supply circuit. The unidirectional switch circuit is disconnected, so that the voltage of the power input port of the power supply circuit reaches the operating voltage of the power supply circuit, thereby starting the power supply circuit and entering 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, wherein: One end of the first resistor is connected to a DC power supply, and the other end is connected to the voltage stabilizing 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 circuit, and the negative electrode is grounded.

4. The device according to claim 1, characterized in that The voltage stabilizing circuit includes: a second resistor, a second capacitor and a voltage stabilizing device, wherein: One end of the second resistor is connected to the power input port of the power 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 switch circuit and the unidirectional switch circuit.

5. The device according to claim 1, characterized in that The switch circuit further comprises: a second diode, a fourth resistor and a fifth resistor, wherein: The second diode is connected in series between the drive signal generating circuit and the gate of the first MOS transistor, with the anode of the second diode connected to the drive signal generating circuit and the cathode of the second diode connected to the gate of the first MOS transistor; A fourth resistor is connected in series between the driving signal generating circuit and the gate of the first MOS transistor; The fifth resistor is connected in series between the voltage stabilizing circuit and the drain of the first MOS transistor.

6. The device according to claim 1, characterized in that The unidirectional switch circuit further comprises: a third diode, a fourth diode, a sixth resistor and a seventh resistor, wherein: A third diode is connected in series between the working port of the power supply circuit and the anode of the thyristor, wherein the anode of the third diode is connected to the working port of the power supply circuit, and the cathode is connected to the anode of the thyristor; A fourth diode is connected in series between the voltage stabilizing circuit and the gate of the thyristor, with the anode of the fourth diode connected to the voltage stabilizing circuit and the switch circuit, and the cathode of the fourth diode 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 circuit and the cathode of the first diode.

7. The device according to claim 1, characterized in that The device further comprises: a synchronous driving circuit, and The synchronous driving circuit includes: an eighth resistor and a first transistor, wherein: the eighth resistor is connected in series between the positive output terminal of the driving signal generating circuit and the base of the first transistor; the base of the first transistor is connected to the eighth resistor, the collector is connected to the voltage stabilizing circuit, and the emitter is connected to the switching circuit; Alternatively, the synchronous drive circuit includes: an eighth resistor and a second MOS transistor, wherein: the eighth resistor is connected in series between the positive output end of the drive signal generating 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 switching circuit.

8. The device according to claim 7, characterized in that The synchronous driving circuit further includes: a fifth diode, wherein the fifth diode is connected in series between the positive output terminal of the driving signal generating circuit and the eighth resistor, and the anode of the fifth diode is connected to the positive output terminal of the driving signal generating circuit, and the cathode of the fifth diode is connected to the eighth resistor.

9. The device according to claim 1, characterized in that The device further comprises: an isolation drive circuit, and The isolation driving circuit includes: a ninth resistor and a unidirectional optical coupler, wherein: The ninth resistor is connected in series between the positive output terminal of the driving signal generating 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 generating 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 switching 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 generating circuit and the negative electrode of the primary side of the unidirectional optocoupler, wherein 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 driving signal generating circuit is a pulse width modulation signal generating circuit.

12. The device according to claim 1, characterized in that The device further comprises: a synchronous driving circuit, and The synchronous driving circuit includes: a tenth resistor and a second triode, wherein: 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 driving signal generating 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 switching circuit; Alternatively, the synchronous drive circuit includes: a tenth resistor and a third MOS transistor, wherein: the tenth resistor is connected in series between the gate of the third MOS transistor and the voltage stabilizing circuit; the gate of the third MOS transistor is connected to the drive signal generating circuit and one end of the tenth resistor, the drain is connected to the other end of the tenth resistor and the voltage stabilizing circuit, and the source is connected to the switching circuit.

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

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