Starting peak current suppression circuit suitable for laser illuminator

Abstract

The utility model relates to a starting peak current suppression circuit suitable for a laser illuminator, which is applied to the technical field of laser illuminators, and comprises the following steps of: acquiring voltage data of an energy storage capacitor charging circuit through a capacitor voltage feedback circuit, and sending the voltage data to an MCU (Microprogrammed Control Unit) control module; and the MCU control module outputs PWM signals with different duty ratios to the charging voltage control circuit according to the acquired voltage data, so that the voltage output by the charging voltage control circuit to the energy storage capacitor charging circuit is gradually increased, and the starting current in the charging process is controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of laser illuminators, and particularly relates to a starting peak current suppression circuit applicable to a laser illuminator. Background Art

[0002] A laser illuminator mainly includes a control circuit, a detector drive circuit, a laser drive circuit, a TQ high-voltage circuit, and an energy storage capacitor charging circuit. The energy storage capacitor provides a pulse current of up to several hundred amperes for the laser to emit light. Therefore, the capacitance value of the energy storage capacitor is large and the voltage is high. When the illuminator starts, the energy storage capacitor needs to be charged. Coupled with the simultaneous startup of each circuit, the instantaneous circuit current required at startup is very large, and the requirements for the input power supply are relatively high.

[0003] At startup, the power supply voltage has not yet stabilized to the set value, the circuit voltage difference is large, and the power supply efficiency is low. At this time, each circuit module starts simultaneously, and the energy storage capacitor needs to be charged. The ESR of the energy storage capacitor is relatively small. To ensure a large charging current for high-repetition-rate operation, a huge surge current will be generated instantaneously at startup. This surge current may cause abnormalities in the power supply equipment and damage to the power supply system. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a starting peak current suppression circuit applicable to a laser illuminator, so as to solve the problems in the prior art that the instantaneous circuit current required when the laser illuminator starts is very large, and a huge surge current will be generated instantaneously at startup, resulting in abnormalities in the power supply equipment and damage to the power supply system.

[0005] The utility model provides a starting peak current suppression circuit applicable to a laser illuminator, and the circuit includes:

[0006] MCU control module: used for receiving the voltage data of the energy storage capacitor charging circuit collected by the capacitor voltage feedback circuit, and also used for outputting PWM signals with different duty cycles to the charging voltage control circuit;

[0007] Charging voltage control circuit: used for receiving the PWM signals with different duty cycles sent by the MCU control module, and controlling the voltage magnitude output to the energy storage capacitor charging circuit according to the PWM signals with different duty cycles, so as to control the charging current of the energy storage capacitor charging circuit;

[0008] Energy storage capacitor charging circuit: used for charging the energy storage capacitor according to the voltage provided by the charging voltage control circuit;

[0009] Capacitor voltage feedback circuit: used for collecting the voltage data of the energy storage capacitor charging circuit and sending it to the MCU control module.

[0010] Preferably, it further includes:

[0011] The MCU control module is further configured to output control signals with different duty cycles to the energy storage capacitor charging circuit, and control the charging voltage of the energy storage capacitor charging circuit through the control signals with different duty cycles.

[0012] Preferably,

[0013] The charging voltage control circuit includes: a switching boost power supply chip U3, an input filter circuit, and an output filter circuit;

[0014] The input end of the input filter circuit is connected to the MCU control module, and the output end of the input filter circuit is respectively connected to one end of a resistor R9 and the VIN pin of the switching boost power supply chip U3; the other end of the resistor R9 is respectively connected to the SHDN pin of the switching boost power supply chip U3, one end of a resistor R11, and one end of a resistor R13;

[0015] One end of the resistor R11 is also respectively connected to the SHDN pin of the switching boost power supply chip U3 and one end of the resistor R13, and the other end of the resistor R11 is used to receive a control signal;

[0016] One end of the resistor R13 is also connected to the SHDN pin of the switching boost power supply chip U3, the other end of the resistor R13 is connected to the SYNC pin of the switching boost power supply chip U3, and the other end of the resistor R13 is also grounded;

[0017] The RT pin of the switching boost power supply chip U3 is connected to one end of a resistor R17, the other end of the resistor R17 is connected to one end of a capacitor C17, and the other end of the resistor R17 is also grounded;

[0018] One end of the capacitor C17 is also grounded, and the other end of the capacitor C17 is connected to the SS pin of the switching boost power supply chip U3;

[0019] The VCC pin of the switching boost power supply chip U3 is connected to one end of a capacitor C24, the other end of the capacitor C24 is connected to the GND pin of the switching boost power supply chip U3, the GND pin of the switching boost power supply chip U3 is also grounded, and the other end of the capacitor C24 is also grounded;

[0020] The VIN pin of the switching boost power supply chip U3 is also connected to one end of the energy storage inductor L1. The other end of the energy storage inductor L1 is respectively connected to the input end of the diode D1 and the drain of the NMOS transistor N1. The gate of the NMOS transistor N1 is connected to the GATE pin of the switching boost power supply chip U3. The source of the NMOS transistor N1 is respectively connected to the CS pin of the switching boost power supply chip U3 and one end of the resistor R16. The other end of the resistor R16 is grounded;

[0021] The output end of the diode D1 is respectively connected to the input end of the output filter circuit and one end of the resistor R15. The output end of the output filter circuit is connected to the energy storage capacitor charging circuit;

[0022] The other end of the resistor R15 is respectively connected to one end of the matching resistor R18, one end of the resistor R4, one end of the capacitor C18, and the FB pin of the switching boost power supply chip U3;

[0023] The other end of the matching resistor R18 is connected to the output end of the RC filter circuit. The input end of the RC filter circuit is connected to the MCU control module for receiving PWM signals with different duty cycles sent by the MCU control module;

[0024] The other end of the resistor R4 is grounded, and the other end of the capacitor C18 is grounded.

[0025] Preferably,

[0026] The input filter circuit includes: capacitor C10, capacitor C11, capacitor C12, and capacitor C13;

[0027] The capacitor C10, capacitor C11, capacitor C12, and capacitor C13 are connected in parallel;

[0028] One ends of the capacitor C10, capacitor C11, capacitor C12, and capacitor C13 are respectively connected to the MCU control module, one end of the resistor R19, and the VIN pin of the switching boost power supply chip U3. The other ends of the capacitor C10, capacitor C11, capacitor C12, and capacitor C13 are respectively grounded.

[0029] Preferably,

[0030] The output filter circuit includes: capacitor C14, capacitor C15, capacitor C16, and capacitor C27;

[0031] The capacitor C14, capacitor C15, capacitor C16, and capacitor C27 are connected in parallel. One ends of the capacitor C14, capacitor C15, capacitor C16, and capacitor C27 are respectively connected to the energy storage capacitor charging circuit, the output end of the diode D1, and one end of the resistor R15;

[0032] The other ends of the capacitor C14, capacitor C15, capacitor C16, and capacitor C27 are grounded respectively;

[0033] The capacitor C27 is an electrolytic capacitor.

[0034] Preferably,

[0035] The RC filter circuit includes: a capacitor C9 and a resistor R19;

[0036] One end of the capacitor C9 is disposed between the other end of the matching resistor R18 and one end of the resistor R19. The other end of the capacitor C9 is grounded. The other end of the resistor R19 is connected to the MCU control module for receiving PWM signals with different duty cycles sent by the MCU control module.

[0037] Preferably,

[0038] The energy storage capacitor charging circuit includes: a PMOS transistor Q1, a diode D2, a capacitor voltage circuit, and an NPN transistor Q2;

[0039] The base of the NPN transistor Q2 is connected to the MCU control module for receiving control signals with different duty cycles sent by the MCU control module;

[0040] The emitter of the NPN transistor Q2 is grounded. The collector of the NPN transistor Q2 is connected to one end of a resistor R14. The other end of the resistor R14 is respectively connected to one ends of a resistor R12 and a resistor R10;

[0041] The other end of the resistor R12 is connected to the gate of the PMOS transistor Q1. The source of the PMOS transistor Q1 is connected to the output end of the charging voltage control circuit. The drain of the PMOS transistor Q1 is connected to the input end of the diode D2;

[0042] The other end of the resistor R10 is disposed between the output end of the charging voltage control circuit and the source of the PMOS transistor Q1;

[0043] The output end of the diode D2 is connected to the capacitor voltage circuit;

[0044] The capacitor voltage circuit includes: a capacitor C19, a capacitor C20, and a capacitor C21;

[0045] The capacitor C19, capacitor C20, and capacitor C21 are connected in parallel. The positive electrodes of the capacitor C19, capacitor C20, and capacitor C21 are respectively connected to the output end of the diode D2;

[0046] The negative electrodes of the capacitor C19, the capacitor C20, and the capacitor C21 are respectively grounded.

[0047] Preferably,

[0048] The capacitor voltage feedback circuit includes: an operational amplifier U4;

[0049] The non-inverting input terminal of the operational amplifier U4 is arranged between one end of the voltage dividing resistor R21 and one end of the voltage dividing resistor R22;

[0050] The other end of the voltage dividing resistor R21 is connected to the capacitor voltage circuit for collecting the capacitor voltage; the other end of the voltage dividing resistor R22 is grounded;

[0051] The output terminal of the operational amplifier U4 is connected to one end of a resistor R23, and the other end of the resistor R23 is connected to the MCU control module for sending the collected capacitor voltage to the MCU control module;

[0052] The inverting input terminal of the operational amplifier U4 is connected between the output terminal of the operational amplifier U4 and one end of the resistor R23;

[0053] The positive power supply of the operational amplifier U4 is respectively connected to the power supply and one end of a capacitor C26, and the other end of the capacitor C26 is grounded;

[0054] The negative power supply of the operational amplifier U4 is grounded.

[0055] The technical solution provided by the embodiment of the present utility model may include the following beneficial effects:

[0056] This application collects the voltage data of the energy storage capacitor charging circuit through the capacitor voltage feedback circuit and sends it to the MCU control module. The MCU control module outputs PWM signals with different duty cycles to the charging voltage control circuit according to the collected voltage data, so that the voltage output by the charging voltage control circuit itself to the energy storage capacitor charging circuit gradually increases, thereby controlling the starting current of the charging process.

[0057] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present utility model and used together with the specification to explain the principles of the present utility model.

[0059] Figure 1 It is a system schematic diagram of a starting peak current suppression circuit applicable to a laser illuminator shown according to an exemplary embodiment;

[0060] Figure 2 is a schematic diagram showing the principle of a charging voltage control circuit according to another exemplary embodiment;

[0061] Figure 3 is a schematic diagram showing the principle of an energy storage capacitor charging circuit according to another exemplary embodiment;

[0062] Figure 4 is a schematic diagram showing the principle of a capacitor voltage feedback circuit according to another exemplary embodiment;

[0063] In the drawings: 1 - MCU control module, 2 - charging voltage control circuit, 3 - energy storage capacitor charging circuit, 4 - capacitor voltage feedback circuit. Detailed implementation manners

[0064] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are only examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0065] Embodiment 1

[0066] Figure 1 is a system schematic diagram of a startup peak current suppression circuit applicable to a laser illuminator according to an exemplary embodiment, and the circuit includes:

[0067] MCU control module 1: configured to receive the voltage data of the energy storage capacitor charging circuit 3 collected by the capacitor voltage feedback circuit 4, and is further configured to output PWM signals with different duty cycles to the charging voltage control circuit 2;

[0068] Charging voltage control circuit 2: configured to receive the PWM signals with different duty cycles sent by the MCU control module 1, and control the voltage magnitude output to the energy storage capacitor charging circuit 3 according to the PWM signals with different duty cycles, so as to control the charging current of the energy storage capacitor charging circuit 3;

[0069] Energy storage capacitor charging circuit 3: configured to charge the energy storage capacitor according to the voltage provided by the charging voltage control circuit 2;

[0070] Capacitor voltage feedback circuit 4: configured to collect the voltage data of the energy storage capacitor charging circuit 3 and send it to the MCU control module 1;

[0071] It can be understood that when the laser illumination is started, after the power supply voltage is stabilized, other circuit modules are started one by one through control, and the energy storage capacitor is charged after other modules. The charging circuit 3 of the energy storage capacitor is turned off at the initial stage of charging, the standard voltage is configured, and the MCU control module 1 outputs a PWM signal with a specific duty cycle to make the charging voltage of the charging voltage control circuit 2 the preset first charging voltage. When the capacitor voltage feedback circuit 4 monitors that the voltage of the capacitor reaches a preset percentage of the standard voltage, the MCU control module 1 continues to output a PWM signal with a specific duty cycle to make the charging voltage of the charging voltage control circuit 2 the preset second charging voltage (the second charging voltage is greater than the first charging voltage), and cycles in turn until the capacitor voltage reaches the configured standard voltage, so as to achieve the purpose of gradually increasing the charging voltage of the charging voltage control circuit 2 through PWM signals with different duty cycles, thereby suppressing the peak current; in addition, if precise control of the starting peak current is required, the MCU control module 1 can directly output control signals with different duty cycles to the energy storage capacitor charging circuit 3, so as to achieve the smoothness of the input current during the charging of the energy storage capacitor and ensure the stability of the power supply module;

[0072] It can be understood that as shown in the attached Figure 2 The switching boost power supply chip U3 shown is a high-power switching boost power supply. Pin 10 is the power input VIN, pin 9 SHDN is the shutdown pin, and the power supply is turned off when the level is low and can be controlled by a control signal. Pin 4 is the switching frequency adjustment pin, pin 3 is the soft start pin, pin 1 is the error amplifier compensation pin, pin 2 is the FB pin, and its output voltage VOUT can be feedback adjusted through the FB pin. Pin 6 is the MOS switch current detection pin (resistor R16 is the sampling resistor), and pin 7 is the output of the MOSFET gate driver. The gate driver outputs a switching signal to make the NMOS transistor N1 switch continuously, and then the inductor L1 stores energy continuously. The energy is released through the diode D1 and converted into a higher AC voltage, and then filtered by a capacitor to convert VOUT into a DC voltage to charge the energy storage capacitor charging circuit 3;

[0073] It can be understood that the capacitors C10, C11, C12, and C13 are connected in parallel to form an input filter circuit to filter out noises of different frequency bands for the VIN pin of the switching boost power supply chip U3. L1 is the energy storage inductor, the diode D1 ensures that the current can only flow in one direction, N1 is the NMOS transistor, and the voltage of the VIN pin of the switching boost power supply chip U3 is increased by controlling its on-off. The capacitors C14, C15, C16, and C27 are connected in parallel to form an output filter circuit. Among them, the capacitor C27 is an electrolytic capacitor, and the energy stored in it also provides an instantaneous current for the energy storage capacitor charging circuit to reduce the impact on the input;

[0074] It can be understood that the core of the charging voltage control circuit 2 is that the MCU control module 1 outputs a preset specific PWR_PWM duty cycle based on the real-time voltage of the capacitor collected by the capacitor voltage feedback circuit 4. This duty cycle is converted into a DC voltage through the RC filter circuit composed of the resistor R19 and the capacitor C9. By changing the node current of the FB pin of the switching boost power supply chip U3 through the matching resistor R18, the charging voltage VOUT of the energy storage capacitor is adjusted. By adjusting the PWR_PWM duty cycle in multiple steps, the VOUT voltage is gradually increased, thereby controlling the starting current of the charging process;

[0075] It can be understood that, as shown in the appendix Figure 3 In the energy storage capacitor charging circuit 3, VOUT is provided for the charging voltage control circuit 2, and CAP_CTL is the control signal provided by the MCU control module 1. The MCU control module 1 can finely adjust the charging voltage applied to the energy storage capacitor by outputting different duty cycles of the CAP_CTL control signal, and further control the starting current. Among them, the function of the diode D2 is to prevent the reverse flow of capacitor current. Among them, the capacitors C19, C20, and C21 are connected in parallel to form a capacitor voltage circuit, and its voltage is V_CAP, which is also the voltage collected by the capacitor voltage feedback circuit 4;

[0076] It can be understood that, as shown in the appendix Figure 4 In the capacitor voltage feedback circuit 4, V_CAP is the capacitor voltage, U4 is an operational amplifier, V_CAP is divided by the voltage dividing resistors R21 and R22 to be converted into a low-level signal and given to the operational amplifier U4. The operational amplifier U4 forms a follower circuit according to the connection method in the appendix Figure 4 The operational amplifier U4 converts the voltage signal into a level signal that can be collected by the MCU control module 1. The MCU control module 1 performs AD acquisition on this level signal, and then outputs PWM signals with different duty cycles according to the voltage data, so that the VOUT voltage output by the charging voltage control circuit 2 is gradually increased, realizing the closed-loop control of the voltage and suppressing the peak current when the system starts.

[0077] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be referred to the same or similar content in other embodiments.

[0078] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" refers to at least two.

[0079] Any process or method description depicted in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code that includes one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations where functions may be executed not in the order shown or discussed, including in a substantially simultaneous manner according to the functions involved or in a reverse order, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0080] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or a combination of the following techniques well-known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0081] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried out in implementing the above-described embodiment methods can be completed by instructing relevant hardware through a program. The said program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0082] Furthermore, in each of the embodiments of the present invention, the functional units can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0083] The above-mentioned storage medium can be a read-only memory, a magnetic disk, an optical disc, or the like.

[0084] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A starting peak current suppression circuit applicable to a laser illuminator, characterized in that The circuit includes: MCU control module: It is used to receive the voltage data of the energy storage capacitor charging circuit collected by the capacitor voltage feedback circuit, and is also used to output PWM signals with different duty cycles to the charging voltage control circuit; Charging voltage control circuit: It is used to receive the PWM signals with different duty cycles sent by the MCU control module, and control the voltage magnitude output to the energy storage capacitor charging circuit according to the PWM signals with different duty cycles, so as to control the charging current of the energy storage capacitor charging circuit; Energy storage capacitor charging circuit: It is used to charge the energy storage capacitor according to the voltage provided by the charging voltage control circuit; Capacitor voltage feedback circuit: It is used to collect the voltage data of the energy storage capacitor charging circuit and send it to the MCU control module.

2. The circuit according to claim 1, characterized in that, It further includes: The MCU control module is also used to output control signals with different duty cycles to the energy storage capacitor charging circuit, and control the charging voltage of the energy storage capacitor charging circuit through the control signals with different duty cycles.

3. The circuit according to claim 2, wherein The charging voltage control circuit includes: a switching boost power supply chip U3, an input filter circuit, and an output filter circuit; The input end of the input filter circuit is connected to the MCU control module, and the output end of the input filter circuit is respectively connected to one end of a resistor R9 and the VIN pin of the switching boost power supply chip U3; the other end of the resistor R9 is respectively connected to the SHDN pin of the switching boost power supply chip U3, one end of a resistor R11, and one end of a resistor R13; One end of the resistor R11 is also respectively connected to the SHDN pin of the switching boost power supply chip U3 and one end of the resistor R13, and the other end of the resistor R11 is used to receive a control signal; One end of the resistor R13 is also connected to the SHDN pin of the switching boost power supply chip U3, the other end of the resistor R13 is connected to the SYNC pin of the switching boost power supply chip U3, and the other end of the resistor R13 is also grounded; The RT pin of the switching boost power supply chip U3 is connected to one end of a resistor R17, the other end of the resistor R17 is connected to one end of a capacitor C17, and the other end of the resistor R17 is also grounded; One end of the capacitor C17 is also grounded, and the other end of the capacitor C17 is connected to the SS pin of the switching boost power supply chip U3; The VCC pin of the switching boost power supply chip U3 is connected to one end of a capacitor C24, the other end of the capacitor C24 is connected to the GND pin of the switching boost power supply chip U3, the GND pin of the switching boost power supply chip U3 is also grounded, and the other end of the capacitor C24 is also grounded; The VIN pin of the switching boost power supply chip U3 is also connected to one end of the energy storage inductor L1. The other end of the energy storage inductor L1 is respectively connected to the input end of the diode D1 and the drain of the NMOS transistor N1. The gate of the NMOS transistor N1 is connected to the GATE pin of the switching boost power supply chip U3. The source of the NMOS transistor N1 is respectively connected to the CS pin of the switching boost power supply chip U3 and one end of the resistor R16. The other end of the resistor R16 is grounded; The output end of the diode D1 is respectively connected to the input end of the output filter circuit and one end of the resistor R15. The output end of the output filter circuit is connected to the energy storage capacitor charging circuit; The other end of the resistor R15 is respectively connected to one end of the matching resistor R18, one end of the resistor R4, one end of the capacitor C18, and the FB pin of the switching boost power supply chip U3; The other end of the matching resistor R18 is connected to the output end of the RC filter circuit. The input end of the RC filter circuit is connected to the MCU control module for receiving PWM signals with different duty cycles sent by the MCU control module; The other end of the resistor R4 is grounded, and the other end of the capacitor C18 is grounded.

4. The circuit according to claim 3, wherein The input filter circuit includes: capacitors C10, C11, C12, and C13; The capacitors C10, C11, C12, and C13 are connected in parallel; One ends of the capacitors C10, C11, C12, and C13 are respectively connected to the MCU control module, one end of the resistor R19, and the VIN pin of the switching boost power supply chip U3. The other ends of the capacitors C10, C11, C12, and C13 are respectively grounded.

5. The circuit according to claim 4, wherein The output filter circuit includes: capacitors C14, C15, C16, and C27; The capacitors C14, C15, C16, and C27 are connected in parallel. One ends of the capacitors C14, C15, C16, and C27 are respectively connected to the energy storage capacitor charging circuit, the output end of the diode D1, and one end of the resistor R15; The other ends of the capacitors C14, C15, C16, and C27 are respectively grounded; The capacitor C27 is an electrolytic capacitor.

6. The circuit according to claim 5, wherein The RC filter circuit includes: capacitor C9 and resistor R19; One end of the capacitor C9 is disposed between the other end of the matching resistor R18 and one end of the resistor R19. The other end of the capacitor C9 is grounded. The other end of the resistor R19 is connected to the MCU control module for receiving PWM signals with different duty cycles sent by the MCU control module.

7. The circuit according to claim 2, wherein The energy storage capacitor charging circuit includes: PMOS transistor Q1, diode D2, capacitor voltage circuit, and NPN transistor Q2; The base of the NPN transistor Q2 is connected to the MCU control module for receiving control signals with different duty cycles sent by the MCU control module; The emitter of the NPN transistor Q2 is grounded, the collector of the NPN transistor Q2 is connected to one end of resistor R14, and the other end of resistor R14 is respectively connected to one end of resistor R12 and resistor R10; The other end of resistor R12 is connected to the gate of PMOS transistor Q1, the source of PMOS transistor Q1 is connected to the output end of the charging voltage control circuit, and the drain of PMOS transistor Q1 is connected to the input end of diode D2; The other end of resistor R10 is provided between the output end of the charging voltage control circuit and the source of PMOS transistor Q1; The output end of diode D2 is connected to the capacitor voltage circuit; The capacitor voltage circuit includes: capacitor C19, capacitor C20, and capacitor C21; Capacitor C19, capacitor C20, and capacitor C21 are connected in parallel, and the positive electrodes of capacitor C19, capacitor C20, and capacitor C21 are respectively connected to the output end of diode D2; The negative electrodes of capacitor C19, capacitor C20, and capacitor C21 are respectively grounded.

8. The circuit according to claim 1, wherein The capacitor voltage feedback circuit includes: operational amplifier U4; The non-inverting input terminal of the operational amplifier U4 is provided between one end of voltage dividing resistor R21 and one end of voltage dividing resistor R22; The other end of voltage dividing resistor R21 is connected to the capacitor voltage circuit for collecting capacitor voltage; the other end of voltage dividing resistor R22 is grounded; The output terminal of the operational amplifier U4 is connected to one end of resistor R23, and the other end of resistor R23 is connected to the MCU control module for sending the collected capacitor voltage to the MCU control module; The inverting input terminal of the operational amplifier U4 is connected between the output terminal of the operational amplifier U4 and one end of resistor R23; The positive power supply of the operational amplifier U4 is respectively connected to the power supply and one end of capacitor C26, and the other end of capacitor C26 is grounded; The negative power supply of the operational amplifier U4 is grounded.

Images