Charger

Abstract

The utility model discloses a charger, and relates to the technical field of charging, and the charger comprises an isolation inverter circuit, a drive circuit, and a control circuit. An input end of the isolation inverter circuit is connected with a power supply, a first output end and a second output end of the isolation inverter circuit are respectively connected with two ends of a load, and a control end of the isolation inverter circuit is connected with an output end of the driving circuit; the input end of the driving circuit is connected with the control circuit; the power regulation function and the isolation transformation function are all integrated to the isolation inverter circuit, so that the isolation inverter circuit can perform isolation transformation and power regulation on the power supply signal output by the power supply based on the driving signal sent by the driving circuit, the number of overall required devices is reduced, the overall space required by the charger is reduced, and the cost is reduced. Under the condition that the power factor is not reduced, the space occupation volume and the cost of the charger are reduced.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charger. Background Art

[0002] With the development of science and technology, in order to save non-renewable resources, the automotive field is gradually leaning towards the direction of electric vehicles. For electric vehicles, chargers are indispensable and are used to charge and extend the battery life of electric vehicles. In the existing technology, if you want to improve the power factor of the charger and reduce the charging loss, you will generally add a PFC circuit, but this will increase the space occupied by the charger and increase the cost. Utility Model Content

[0003] The main purpose of this application is to provide a charger, aiming to solve the technical problem of how to reduce the space occupied by the charger and save costs while ensuring that the charger has a good power factor.

[0004] To achieve the above object, an embodiment of the present application provides a charger, the charger comprising: an isolation inverter circuit, a drive circuit and a control circuit;

[0005] The input end of the isolation inverter circuit is connected to the power supply, the first output end and the second output end of the isolation inverter circuit are respectively connected to the two ends of the load, the control end of the isolation inverter circuit is connected to the output end of the drive circuit; the input end of the drive circuit is connected to the control circuit;

[0006] The control circuit is used to output a PWM signal to the drive circuit;

[0007] The driving circuit is used to send a driving signal to the isolated inverter circuit when receiving the PWM signal;

[0008] The isolated inverter circuit is used to transform the power supply signal output by the power supply when receiving the driving signal, and send the transformed power supply signal to the load;

[0009] The isolated inverter circuit is also used to adjust the phase difference between the fundamental wave current and the fundamental wave voltage of the power supply signal to increase the output power of the power supply signal.

[0010] In one embodiment, the isolation inverter circuit includes: a first diode, a first resistor, a second resistor, a first capacitor, a first NMOS transistor and an isolation transformer;

[0011] The first high-voltage end of the isolation transformer is respectively connected to the power supply and the cathode of the first diode, the second high-voltage end of the isolation transformer is respectively connected to the first end of the first resistor, the first end of the first capacitor and the drain of the first NMOS tube, the first low-voltage end of the isolation transformer is connected to the first end of the load, and the second low-voltage end of the isolation transformer is connected to the second end of the load; the source of the first NMOS tube is grounded, and the gate of the first NMOS tube is connected to the output end of the drive circuit; the second end of the first resistor is respectively connected to the second end of the first capacitor and the anode of the first diode.

[0012] In one embodiment, the driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, a second diode, a third diode, a second capacitor, a first N-type transistor, and a first P-type transistor;

[0013] The first end of the third resistor is respectively connected to the control end of the isolation inverter circuit and the first end of the fourth resistor, the second end of the third resistor is respectively connected to the anode of the second diode and the first end of the second capacitor, and the second end of the fourth resistor is connected to the anode of the third diode; the cathode of the third diode is grounded; the cathode of the second diode is respectively connected to the second end of the second capacitor, the emitter of the first N-type transistor and the collector of the first P-type transistor; the base of the first N-type transistor is respectively connected to the first end of the fifth resistor and the base of the first P-type transistor, and the collector of the first N-type transistor is connected to the first power supply; the emitter of the first P-type transistor is grounded; the second end of the fifth resistor is connected to the first output end of the control circuit.

[0014] In one embodiment, the charger further includes: an EMC circuit, a first rectifying and filtering circuit, and a second rectifying and filtering circuit, the EMC circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a common-mode inductor, the first rectifying and filtering circuit includes a seventh capacitor, a sixth resistor, and a first rectifying bridge, and the second rectifying and filtering circuit includes a fourth diode and an eighth capacitor; the power supply is an AC power supply;

[0015] The input pins of the common-mode inductor are respectively connected to the positive electrode of the AC power supply and the first end of the third capacitor, the output pins of the common-mode inductor are respectively connected to the first end of the fourth capacitor, the first end of the fifth capacitor and the first input end of the first rectifier bridge, the first ground pins of the common-mode inductor are respectively connected to the negative electrode of the AC power supply and the second end of the third capacitor, the second ground pins of the common-mode inductor are respectively connected to the second end of the fourth capacitor, the first end of the sixth capacitor and the second input end of the first rectifier bridge; the second end of the fifth capacitor and the second end of the sixth capacitor are grounded;

[0016] The first output end of the first rectifier bridge is respectively connected to the first end of the seventh capacitor, the first end of the sixth resistor and the input end of the isolation inverter circuit, and the second output end of the first rectifier bridge is respectively connected to the second end of the seventh capacitor and the second end of the sixth resistor;

[0017] The anode of the fourth diode is connected to the first output end of the isolation inverter circuit, the cathode of the fourth diode is respectively connected to the first end of the eighth capacitor and the first end of the load, and the second end of the eighth capacitor is respectively connected to the second output end of the isolation inverter circuit and the second end of the load.

[0018] In one embodiment, the charger further includes: an input voltage acquisition circuit and an input current acquisition circuit, the input voltage acquisition circuit includes a second rectifier bridge, seventh to thirteenth resistors and a second N-type transistor, and the input current acquisition circuit includes fourteenth to sixteenth resistors, a current transformer and a fifth diode;

[0019] The first input end of the second rectifier bridge is connected to the positive electrode of the AC power supply, the second input end of the second rectifier bridge is connected to the negative electrode of the AC power supply, the first output end of the second rectifier bridge is connected to the first end of the seventh resistor, the second output end of the second rectifier bridge, the second end of the eighth resistor and the emitter of the second N-type transistor are grounded; the second end of the seventh resistor is respectively connected to the first end of the eighth resistor and the first end of the ninth resistor; the second end of the ninth resistor is respectively connected to the base of the second N-type transistor and the second end of the tenth resistor; the first end of the tenth resistor is respectively connected to the second end of the eleventh resistor, the first end of the twelfth resistor and the collector of the second N-type transistor, the first end of the eleventh resistor is connected to the third power supply, the second end of the twelfth resistor is connected to the first end of the thirteenth resistor, and the second end of the thirteenth resistor is connected to the sampling end of the control circuit;

[0020] The second end of the fourteenth resistor and the first end of the fifteenth resistor are also connected to the sampling end of the control circuit, and the first end of the fourteenth resistor is respectively connected to the first end of the sixteenth resistor and the cathode of the fifth diode; the second end of the fifteenth resistor and the second end of the sixteenth resistor are grounded; the anode of the fifth diode is connected to the second current inflow end of the current transformer, the second current outflow end of the current transformer is grounded, the first current inflow end of the current transformer is connected to the first output end of the first rectifier bridge, and the second current outflow end of the current transformer is connected to the input end of the isolation inverter circuit.

[0021] In one embodiment, the charger further includes: an output current acquisition circuit, the output current acquisition circuit including a Hall sensor, a seventeenth resistor to a twenty-fifth resistor, a first operational amplifier, a second operational amplifier, a ninth capacitor to a twelfth capacitor, and a first coupling device;

[0022] The first end of the Hall sensor is connected to the second output end of the isolation inverter circuit, the second end of the Hall sensor is connected to the second end of the load, the third end of the Hall sensor is connected to the seventeenth resistor, and the fourth end of the Hall sensor is connected to the eighteenth resistor, the reverse input end of the first operational amplifier is respectively connected to the second end of the seventeenth resistor, the first end of the ninth capacitor and the first end of the nineteenth resistor, the forward input end of the first operational amplifier is respectively connected to the second end of the eighteenth resistor, the first end of the twentieth resistor and the first end of the tenth capacitor, the output end of the first operational amplifier is respectively connected to the second end of the nineteenth resistor, the second end of the ninth capacitor and the first end of the twenty-first resistor; the second end of the twentieth resistor and the second end of the tenth capacitor are grounded;

[0023] The reverse input terminal of the second operational amplifier is respectively connected to the second end of the twenty-first resistor, the first end of the twenty-third resistor and the first end of the eleventh capacitor, the forward input terminal of the second operational amplifier is connected to the second end of the twenty-second resistor, and the output terminal of the second operational amplifier is respectively connected to the second end of the eleventh capacitor, the second end of the twelfth capacitor and the first end of the twenty-fourth resistor; the second end of the twenty-third resistor is connected to the first end of the twelfth capacitor; the second end of the twenty-fourth resistor is connected to the anode of the first optocoupler device, the cathode of the first optocoupler device is grounded, the collector of the first optocoupler device is connected to the second end of the twenty-fifth resistor, and the emitter of the first optocoupler device is grounded; the first end of the twenty-fifth resistor is connected to the second end of the seventh resistor; the first end of the twenty-second resistor is used to receive a current given signal.

[0024] In one embodiment, the charger further includes: an output voltage acquisition circuit, the output voltage acquisition circuit including a twenty-sixth resistor to a thirty-sixth resistor, a first voltage stabilizing diode, a second optocoupler, a third optocoupler, a thirteenth capacitor, a fourteenth capacitor, an isolation operational amplifier, a third operational amplifier, and a fourth operational amplifier;

[0025] The first end of the twenty-sixth resistor is respectively connected to the cathode of the fourth diode and the first end of the twenty-eighth resistor, the second end of the twenty-sixth resistor is respectively connected to the first end of the twenty-seventh resistor and the input end of the isolation operational amplifier, the second end of the twenty-eighth resistor is connected to the cathode of the first voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is connected to the anode of the second optocoupler, the cathode of the second optocoupler and the second end of the twenty-seventh resistor are connected to the second end of the load, the collector of the second optocoupler is connected to the compensation end of the control circuit, and the emitter of the second optocoupler is grounded; the control end of the isolation operational amplifier is connected to the second end of the load, the positive output end of the isolation operational amplifier is connected to the first end of the twenty-ninth resistor, and the reverse output end of the isolation operational amplifier is connected to the first end of the thirtieth resistor; the positive input end of the third operational amplifier is respectively connected to the second end of the twenty-ninth resistor, the first end of the thirty-first resistor and the first end of the thirteenth capacitor, and the third operational amplifier The reverse input end of the amplifier is respectively connected to the second end of the 30th resistor, the first end of the 32nd resistor and the first end of the 14th capacitor, the output end of the third operational amplifier is respectively connected to the second end of the 32nd resistor, the second end of the 14th capacitor and the first end of the 33rd resistor; the second end of the 31st resistor and the second end of the 13th capacitor are grounded; the reverse input end of the fourth operational amplifier is connected to the second end of the 33rd resistor, the positive input end of the fourth operational amplifier is respectively connected to the second end of the 34th resistor and the second end of the 35th resistor, the output end of the fourth operational amplifier is respectively connected to the first end of the 35th resistor and the cathode of the third optocoupler; the anode of the third optocoupler is connected to the second end of the 36th resistor, the collector of the third optocoupler is connected to the compensation end of the control circuit, and the emitter of the third optocoupler is grounded; the first end of the 36th resistor is connected to the second power supply; the first end of the 34th resistor is used to receive a voltage given signal.

[0026] In one embodiment, the charger further includes: a discharge circuit, the discharge circuit including a thirty-seventh resistor to a forty-third resistor, a second voltage-stabilizing diode, a third voltage-stabilizing diode, a sixth diode, a light-emitting diode, a fourth optocoupler, a fifth optocoupler, a second P-type transistor, a fifteenth capacitor, a sixteenth capacitor, and a second NMOS transistor;

[0027] The first end of the thirty-seventh resistor is respectively connected to the first end of the load and the first end of the thirty-eighth resistor, the second end of the thirty-seventh resistor is respectively connected to the cathode of the second voltage-stabilizing diode and the anode of the sixth diode, the cathode of the sixth diode is respectively connected to the first end of the fifteenth capacitor and the first end of the thirty-ninth resistor, the second end of the thirty-ninth resistor is respectively connected to the collector of the fourth optocoupler, the first end of the fortieth resistor and the gate of the second NMOS tube, the drain of the second NMOS tube, the second end of the fortieth resistor, the emitter of the fourth optocoupler, the second end of the fifteenth capacitor and the anode of the second voltage-stabilizing diode are connected to the second end of the load; the second end of the thirty-eighth resistor is connected to the source of the second NMOS tube; the anode of the fourth optocoupler is connected to the fifth optocoupler, and the cathode of the fourth optocoupler is grounded;

[0028] The anode of the fifth optocoupler is connected to the second end of the forty-first resistor, the collector of the fifth optocoupler is connected to the first end of the forty-second resistor, and the emitter of the fifth optocoupler is grounded; the second end of the forty-second resistor is connected to the anode of the third voltage-stabilizing diode, the cathode of the third voltage-stabilizing diode is connected to the cathode of the light-emitting diode, the anode of the light-emitting diode is respectively connected to the base of the second P-type transistor, the emitter of the second P-type transistor is connected to the second end of the forty-third resistor, and the collector of the second P-type transistor is respectively connected to the power supply end of the control circuit and the first end of the sixteenth capacitor; the first end of the forty-third resistor is connected to the first power supply; the second end of the sixteenth capacitor is grounded; the first end of the forty-first resistor is used to receive an open wave signal.

[0029] In one embodiment, the charger further includes: a temperature protection circuit, the temperature protection circuit including a first temperature-sensitive resistor, a second temperature-sensitive resistor, a third temperature-sensitive resistor, a 44th resistor to a 55th resistor, a third N-type transistor, a 17th capacitor, a 7th diode to a 10th diode, a fifth operational amplifier, a sixth operational amplifier, and a sixth optocoupler;

[0030] The first temperature-sensitive resistor is arranged around the first NMOS transistor, the first end of the first temperature-sensitive resistor is respectively connected to the first end of the forty-sixth resistor, the first end of the seventeenth capacitor, the second end of the forty-fifth resistor and the base of the third N-type transistor, the second end of the first temperature-sensitive resistor, the second end of the forty-sixth resistor, the second end of the seventeenth capacitor and the emitter of the third N-type transistor are grounded; the first end of the forty-fifth resistor is connected to the third power supply; the collector of the third N-type transistor is connected to the second end of the forty-fourth resistor, and the first end of the forty-fourth resistor is connected to the cathode of the fifth diode;

[0031] The second temperature-sensitive resistor is arranged around the isolation transformer, the first end of the second temperature-sensitive resistor is respectively connected to the positive input end of the fifth operational amplifier, the second end of the 47th resistor and the second end of the 50th resistor, and the second end of the second temperature-sensitive resistor is grounded; the reverse input end of the fifth operational amplifier is respectively connected to the second end of the 48th resistor and the first end of the 49th resistor, and the output end of the fifth operational amplifier is respectively connected to the cathode of the seventh diode and the cathode of the eighth diode; the first end of the 47th resistor and the first end of the 48th resistor are connected to the third power supply, and the second end of the 49th resistor is grounded; the second end of the 50th resistor is connected to the anode of the seventh diode;

[0032] The third temperature-sensitive resistor is arranged at the center of the charger, the first end of the third temperature-sensitive resistor is respectively connected to the second end of the fifty-first resistor, the first end of the fifty-fourth resistor and the positive input end of the sixth operational amplifier, and the second end of the third temperature-sensitive resistor is grounded; the reverse input end of the sixth operational amplifier is respectively connected to the second end of the fifty-second resistor and the first end of the fifty-third resistor, and the output end of the sixth operational amplifier is respectively connected to the cathode of the ninth diode and the cathode of the tenth diode; the first end of the fifty-first resistor and the first end of the fifty-second resistor are connected to the third power supply, and the second end of the fifty-third resistor is grounded; the second end of the fifty-fourth resistor is connected to the anode of the ninth diode;

[0033] The anode of the eighth diode is respectively connected to the cathode of the sixth optocoupler and the anode of the tenth diode; the anode of the sixth optocoupler is connected to the second end of the fifty-fifth resistor, the collector of the sixth optocoupler is connected to the compensation end of the control circuit, and the emitter of the sixth optocoupler is grounded; the first end of the fifty-fifth resistor is connected to the second power supply.

[0034] The control circuit includes: a fourth voltage stabilizing diode, a fifty-sixth resistor to a fifty-eighth resistor, an eighteenth capacitor, a nineteenth capacitor, an eleventh diode and a control chip;

[0035] The power supply pins of the control chip are respectively connected to the collector of the second P-type transistor and the first end of the fifty-seventh resistor, the output pin of the control chip is connected to the second end of the fourth resistor, the sampling pin of the control chip is connected to the second end of the thirteenth resistor, and the compensation pins of the control chip are respectively connected to the collector of the sixth optocoupler, the collector of the second optocoupler, the collector of the third optocoupler, the cathode of the fourth zener diode, the first end of the fifty-sixth resistor, the first end of the eighteenth capacitor and the anode of the eleventh diode; the cathode of the eleventh diode is respectively connected to the first end of the nineteenth capacitor, the first end of the fifty-seventh resistor and the second end of the fifty-eighth resistor; the anode of the fourth zener diode, the second end of the fifty-sixth resistor, the second end of the eighteenth capacitor, the second end of the nineteenth capacitor and the second end of the fifty-eighth resistor are grounded.

[0036] An embodiment of the present application provides a charger, which includes: an isolated inverter circuit, a drive circuit and a control circuit; the input end of the isolated inverter circuit is connected to a power supply, the first output end and the second output end of the isolated inverter circuit are respectively connected to two ends of a load, and the control end of the isolated inverter circuit is connected to the output end of the drive circuit; the input end of the drive circuit is connected to the control circuit; the control circuit is used to output a PWM signal to the drive circuit; the drive circuit is used to send a drive signal to the isolated inverter circuit when receiving the PWM signal; the isolated inverter circuit is used to transform the power supply signal output by the power supply when receiving the drive signal, and send the transformed power supply signal to the load after transformation; the isolated inverter circuit is also used to adjust the phase difference between the fundamental current and the fundamental voltage of the power supply signal to improve the output power of the power supply signal. By integrating the power regulation function and the isolation transformation function into the isolated inverter circuit, it can perform both isolation transformation and power regulation based on the driving signal sent by the driving circuit, thereby reducing the number of required components and the overall space required for the charger, ensuring that the space occupied by the charger and the cost are reduced without reducing the power factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 A structural connection diagram provided for the first embodiment of the outdoor battery charging circuit of the present application;

[0040] Figure 2 This is a circuit connection diagram provided for the second embodiment of the outdoor battery charging circuit of the present application.

[0041] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0043] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0044] The main solution of the present application is: a PWM signal is sent to a driving circuit through a control circuit, and when the driving circuit receives the PWM signal, the isolation inverter circuit is turned on to work. When the isolation inverter circuit is working, it not only isolates and transforms the power supply signal output by the power supply, but also adjusts the output power of the power supply signal, so that the load can receive the required voltage and power supply.

[0045] At present, in order to improve market competitiveness, manufacturers need to increase the power factor of the charger to a higher level while reducing the size of the charger to a lower level for easier use by users; in order to increase profits, the components of the charger need to be reduced. However, in actual situations, although reducing some functional modules of the charger will increase profits, it will lead to a lower power factor. Although increasing the functional modules of the charger can improve the power factor, it will increase the overall space occupied by the charger and increase costs, making it difficult to meet both needs at the same time. Therefore, how to reduce the space occupied by the charger and save costs while ensuring that the charger has a good power factor is a problem that needs to be solved urgently.

[0046] The present application integrates the power regulation function and the isolation transformation function into the isolation inverter circuit, so that it can isolate and transform the power supply signal output by the power supply power source based on the driving signal sent by the driving circuit, and perform power regulation, thereby reducing the number of required components and the overall space required for the charger, thereby ensuring that the space occupied by the charger and the cost are reduced without reducing the power factor.

[0047] Based on this, the present application proposes an outdoor battery charging circuit of the first embodiment, please refer to Figure 1, the present application proposes a charger, the charger comprising: an isolation inverter circuit 10, a drive circuit 20 and a control circuit 30;

[0048] The input end of the isolation inverter circuit 10 is connected to the power supply 40, the first output end and the second output end of the isolation inverter circuit 10 are respectively connected to the two ends of the load 50, the control end of the isolation inverter circuit 10 is connected to the output end of the drive circuit 20; the input end of the drive circuit 20 is connected to the control circuit 30;

[0049] The control circuit 30 is used to output a PWM signal to the drive circuit 20;

[0050] The driving circuit 20 is used to send a driving signal to the isolated inverter circuit 10 when receiving the PWM signal;

[0051] The isolated inverter circuit 10 is used to transform the power supply signal output by the power supply 40 when receiving the driving signal, and send the transformed power supply signal to the load 50;

[0052] The isolation inverter circuit 10 is further used to adjust the phase difference between the fundamental wave current and the fundamental wave voltage of the power supply signal to increase the output power of the power supply signal.

[0053] It should be understood that the PWM signal is a control signal, and the drive circuit 20 can generate a corresponding drive signal with high and low levels that changes periodically based on the PWM signal.

[0054] It should be noted that, in the present embodiment, the isolated inverter circuit 10 integrates the PFC function and the isolation transformation function to form a flyback switch topology structure. When receiving the driving signal output by the driving circuit 20, it not only performs power factor adjustment on the power supply signal output by the power supply 40, but also performs isolation transformation on the power supply signal.

[0055] It is easy to understand that in this embodiment, when the drive circuit 20 receives the PWM signal sent by the control circuit 30, it generates a corresponding drive signal based on the electrical parameters (such as duty cycle, frequency, etc.) of the PWM signal and sends it to the isolation inverter circuit 10. The isolation inverter circuit 10 transforms the power supply signal output by the power supply 40 based on the drive signal, and at the same time adjusts the phase of the fundamental voltage and the phase of the fundamental current of the power supply signal to keep them consistent, so as to adjust the output power. Thereby increasing the output power of the power supply signal after the voltage transformation output to the load 50, or understanding that the power factor of the charger is improved.

[0056] It is worth noting that, since the isolated inverter circuit 10 can realize the functions of power regulation and isolated voltage transformation at the same time, at least any one of the PFC function modules or isolated voltage transformation function modules set inside the charger can be reduced, that is, a large number of electronic components used for the PFC function and the isolated voltage transformation function are reduced, and its energy conversion efficiency is higher (with a higher power factor). Therefore, the space occupied by the charger and the manufacturing cost can be reduced while increasing the power factor of the charger.

[0057] An embodiment of the present application provides a charger, which includes: an isolated inverter circuit, a drive circuit and a control circuit; the input end of the isolated inverter circuit is connected to a power supply, the first output end and the second output end of the isolated inverter circuit are respectively connected to two ends of a load, and the control end of the isolated inverter circuit is connected to the output end of the drive circuit; the input end of the drive circuit is connected to the control circuit; the control circuit is used to output a PWM signal to the drive circuit; the drive circuit is used to send a drive signal to the isolated inverter circuit when receiving the PWM signal; the isolated inverter circuit is used to transform the power supply signal output by the power supply when receiving the drive signal, and send the transformed power supply signal to the load after transformation; the isolated inverter circuit is also used to adjust the phase difference between the fundamental current and the fundamental voltage of the power supply signal to improve the output power of the power supply signal. By integrating the power regulation function and the isolation transformation function into the isolation inverter circuit, it is possible to isolate and transform the power supply signal output by the power supply based on the drive signal sent by the drive circuit, and perform power regulation, thereby reducing the number of required components and the overall space required for the charger, thereby ensuring that the space occupied by the charger and the cost are reduced without reducing the power factor.

[0058] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 2 , the isolated inverter circuit 10 includes: a first diode D1, a first resistor R1, a second resistor R2, a first capacitor C1, a first NMOS transistor Qn1 and an isolation transformer T1;

[0059] The first high-voltage end of the isolation transformer T1 is respectively connected to the power supply 40 and the cathode of the first diode D1, the second high-voltage end of the isolation transformer T1 is respectively connected to the first end of the first resistor R1, the first end of the first capacitor C1 and the drain of the first NMOS transistor Qn1, the first low-voltage end of the isolation transformer T1 is connected to the first end of the load 50, and the second low-voltage end of the isolation transformer T1 is connected to the second end of the load 50; the source of the first NMOS transistor Qn1 is grounded, and the gate of the first NMOS transistor Qn1 is connected to the output end of the drive circuit 20; the second end of the first resistor R1 is respectively connected to the second end of the first capacitor C1 and the anode of the first diode D1.

[0060] It is easy to understand that in this embodiment, the isolation transformer T1 itself has the function of isolation and voltage transformation, and the primary coil inside it can also be used as an inductor, that is, the isolation transformer T1 also serves as a PFC inductor. Therefore, the isolation transformer T1, the first capacitor C1, the first resistor R1 and the first diode D1 constitute a primary absorption circuit. Among them, the first resistor R1 provides absorption impedance for matching with the input impedance, and also serves to limit the current protection of various electronic devices in the circuit; the first diode D1 is used for rectification to prevent current backflow; the isolation transformer T1 interacts with the first capacitor C1 as a PFC inductor, charges and discharges during operation, and serves to transfer energy and adjust the current and voltage phase. At the same time, the PFC inductor and the first capacitor C1 also constitute an LC filter circuit, which can filter out high-frequency noise. Among them, its charging and discharging process is controlled by the conduction and cutoff of the first NMOS tube Qn1. If the gate of the first NMOS tube receives a low-level driving signal through the second resistor R2, it enters the cutoff state, and the first capacitor C1 receives the electric energy transmitted by the PFC inductor for charging; if the gate of the first NMOS tube receives a high-level driving signal through the second resistor R2, it enters the conduction state, and the first capacitor C1 is equivalent to grounding and starts to discharge. Repeated charging and discharging enables the isolation transformer T1 to achieve isolation transformer function and power factor adjustment function. Since the isolation transformer T1 plays the role of isolation transformer and serves as a PFC inductor, there is no need to set up a PFC function module or a high-voltage isolation function module separately in the charger, which not only saves the overall space occupied by the charger, but also reduces the number of electronic devices required for manufacturing, saving costs.

[0061] It is worth noting that in this embodiment, the first NMOS tube can be a SiC-MOS tube. The SiC-MOS tube has the characteristics of high voltage resistance, fast response speed, low loss, small size, fast heat dissipation and high reliability at high temperature, which further ensures the working stability of the high-voltage isolation circuit and can improve the power factor of the charger.

[0062] Further, in this embodiment, the driving circuit 20 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second diode D2, a third diode D3, a second capacitor C2, a first N-type transistor Vn1 and a first P-type transistor Vp1;

[0063] The first end of the third resistor R3 is respectively connected to the control end of the isolation inverter circuit 10 and the first end of the fourth resistor R4, the second end of the third resistor R3 is respectively connected to the anode of the second diode D2 and the first end of the second capacitor C2, and the second end of the fourth resistor R4 is connected to the anode of the third diode D3; the cathode of the third diode D3 is grounded; the cathode of the second diode D2 is respectively connected to the second end of the second capacitor C2, the emitter of the first N-type transistor Vn1 and the collector of the first P-type transistor Vp1; the base of the first N-type transistor Vn1 is respectively connected to the first end of the fifth resistor R5 and the base of the first P-type transistor Vp1, and the collector of the first N-type transistor Vn1 is connected to the first power supply VCC1; the emitter of the first P-type transistor Vp1 is grounded; the second end of the fifth resistor R5 is connected to the first output end of the control circuit 30.

[0064] It should be noted that the first N-type transistor Vn1 and the first P-type transistor Vp1 in the driving circuit 20 form a push-pull circuit structure, which is used to improve the output capability of the PWM signal output by the control circuit 30. Among them, the fifth resistor R5 is used to limit the current of the PWM signal to protect the first N-type transistor Vn1 and the first P-type transistor Vp1. The first power supply VCC1 can be a DC power supply. In this embodiment, its specific output voltage can be 24V, which provides a reference voltage for amplification for the push-pull circuit structure.

[0065] In a specific implementation, the push-pull circuit can amplify the received PWM signal, and transmit the corresponding high and low level driving signals to the second resistor R2 in the isolation inverter circuit 10 through the second capacitor C2 and the third resistor R3 until the gate of the first NMOS tube, so that the first NMOS tube is repeatedly turned on and off with the driving signal. The isolation inverter circuit 10 performs isolation transformation processing and power regulation processing on the power supply signal output by the power supply 40 based on the received driving signal.

[0066] Further, in this embodiment, the charger further includes: an EMC circuit 60, a first rectifying and filtering circuit 70, and a second rectifying and filtering circuit 80, the EMC circuit 60 includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a common-mode inductor L1, the first rectifying and filtering circuit 70 includes a seventh capacitor C7, a sixth resistor R6, and a first rectifier bridge DB1, and the second rectifying and filtering circuit 80 includes a fourth diode D4 and an eighth capacitor C8; the power supply 40 is an AC power supply;

[0067] The input pins of the common-mode inductor L1 are respectively connected to the positive electrode of the AC power supply and the first end of the third capacitor C3, the output pins of the common-mode inductor L1 are respectively connected to the first end of the fourth capacitor C4, the first end of the fifth capacitor C5 and the first input end of the first rectifier bridge DB1, the first ground pins of the common-mode inductor L1 are respectively connected to the negative electrode of the AC power supply and the second end of the third capacitor C3, the second ground pins of the common-mode inductor L1 are respectively connected to the second end of the fourth capacitor C4, the first end of the sixth capacitor C6 and the second input end of the first rectifier bridge DB1; the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are grounded;

[0068] The first output end of the first rectifier bridge DB1 is respectively connected to the first end of the seventh capacitor C7, the first end of the sixth resistor R6 and the input end of the isolation inverter circuit 10, and the second output end of the first rectifier bridge DB1 is respectively connected to the second end of the seventh capacitor C7 and the second end of the sixth resistor R6;

[0069] The anode of the fourth diode D4 is connected to the first output end of the isolation inverter circuit 10, the cathode of the fourth diode D4 is respectively connected to the first end of the eighth capacitor C8 and the first end of the load 50, and the second end of the eighth capacitor C8 is respectively connected to the second output end of the isolation inverter circuit 10 and the second end of the load 50.

[0070] It should be understood that, in this embodiment, the third capacitor C3 and the fourth capacitor C4 are used as X capacitors, the fifth capacitor C5 and the sixth capacitor C6 are used as Y capacitors, and the common-mode inductor L1 is combined to form an EMC circuit 60 for filtering out common-mode noise and differential-mode noise of the AC power supply signal output by the power supply 40.

[0071] It is easy to understand that in the first rectifier and filter circuit 70, the first rectifier bridge DB1 is used to rectify the power supply signal, and the parallel structure of the sixth resistor R6 and the seventh capacitor C7 is used to filter the rectified DC power supply signal. In a specific implementation, when the first rectifier bridge DB1 receives the power supply signal that filters out the common mode noise and the differential mode noise, it converts the AC power supply signal into a DC power supply signal, and filters it by connecting the sixth resistor R6 and the seventh capacitor C7 in parallel, so that the DC power supply signal with less harmonics can be sent to the isolated inverter circuit 10, which can help improve the power output efficiency of the charger, that is, improve the power factor.

[0072] In addition, in the second rectifying and filtering circuit 80, the power supply signal output by the isolation transformer T1 after voltage transformation and power adjustment is rectified by the fourth diode D4, and the power supply signal output to the load 50 after rectification by the large-capacitance eighth capacitor C8 is filtered.

[0073] It is worth noting that in this embodiment, the fourth diode D4 can be a SiC diode. The SiC diode has the characteristics of high voltage resistance, fast response speed, low loss, small size, fast heat dissipation and high reliability at high temperature, which further ensures the working stability of the high-voltage isolation circuit. At the same time, it can reduce the electromagnetic interference generated by the operation of the isolation transformer T1. Its high voltage resistance and unidirectional conduction characteristics can prevent other electronic devices in the circuit from being damaged due to receiving reverse high voltage, and can improve the stability of the charger output voltage and power.

[0074] Furthermore, in this embodiment, the charger further includes: an input voltage acquisition circuit 90 and an input current acquisition circuit 100, wherein the input voltage acquisition circuit 90 includes a second rectifier bridge DB2, a seventh resistor R7 to a thirteenth resistor R13 and a second N-type transistor Vn2, and the input current acquisition circuit 100 includes a fourteenth resistor R14 to a sixteenth resistor R16, a current transformer T2 and a fifth diode D5;

[0075] The first input end of the second rectifier bridge DB2 is connected to the positive electrode of the AC power supply, the second input end of the second rectifier bridge DB2 is connected to the negative electrode of the AC power supply, the first output end of the second rectifier bridge DB2 is connected to the first end of the seventh resistor R7, the second output end of the second rectifier bridge DB2, the second end of the eighth resistor R8 and the emitter of the second N-type transistor Vn2 are grounded; the second end of the seventh resistor R7 is respectively connected to the first end of the eighth resistor R8 and the first end of the ninth resistor R9; the second end of the ninth resistor R9 is respectively connected to the base of the second N-type transistor Vn2 and the second end of the tenth resistor; the first end of the tenth resistor is respectively connected to the second end of the eleventh resistor R11, the first end of the twelfth resistor R12 and the collector of the second N-type transistor Vn2, the first end of the eleventh resistor R11 is connected to the third power supply VCC3, the second end of the twelfth resistor R12 is connected to the first end of the thirteenth resistor R13, and the second end of the thirteenth resistor R13 is connected to the sampling end of the control circuit 30;

[0076] The second end of the fourteenth resistor R14 and the first end of the fifteenth resistor R15 are also connected to the sampling end of the control circuit 30, and the first end of the fourteenth resistor R14 is respectively connected to the first end of the sixteenth resistor R16 and the cathode of the fifth diode D5; the second end of the fifteenth resistor R15 and the second end of the sixteenth resistor R16 are grounded; the anode of the fifth diode D5 is connected to the second current inflow end of the current transformer T2, the second current outflow end of the current transformer T2 is grounded, the first current inflow end of the current transformer T2 is connected to the first output end of the first rectifier bridge DB1, and the second current outflow end of the current transformer T2 is connected to the input end of the isolation inverter circuit 10.

[0077] It should be noted that, in the present embodiment, the input voltage acquisition circuit 90 may collect the input voltage feedback of the power supply signal input to the isolated inverter circuit 10, and the input current acquisition circuit 100 may collect the input current feedback of the power supply signal input to the isolated inverter circuit 10 to adjust the electrical parameters of the PWM signal output by the control circuit 30, thereby adjusting the electrical parameters of the drive signal output by the drive circuit 20 to change the output power of the isolated inverter circuit 10.

[0078] In a specific implementation, the second rectifier bridge DB2 can rectify the AC power supply signal output by the power supply 40 into a DC power supply signal, and then divide the DC power supply signal based on the voltage-dividing structure formed by the seventh resistor R7 and the eighth resistor R8, and then reversely amplify the DC power supply signal through the reverse amplifier circuit composed of the tenth resistor, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13 and the second N-type transistor Vn2, and then transmit the obtained input voltage feedback amount to the sampling terminal CS of the control circuit 30. The control circuit 30 changes the electrical parameters of the output PWM signal based on the received input voltage feedback amount, thereby adjusting the electrical parameters of the drive signal output by the drive circuit 20 to change the output power of the isolated inverter circuit 10. In this embodiment, the output power upper limit of the isolated inverter circuit 10 can be increased by changing the input voltage feedback amount received by the control circuit 30, and the input voltage feedback amount received by the control circuit 30 can be adjusted by adjusting the impedance ratio of the seventh resistor R7 to the eighth resistor R8.

[0079] At the same time, the current transformer T2 can also collect the current value of the DC power supply signal obtained after rectification by the first rectifier bridge DB1, and transmit it to the sampling terminal CS of the control circuit 30 through the fifth diode D5, the fourteenth resistor R14, and the fifteenth resistor R15. The control circuit 30 can control the electrical parameters of the PWM signal based on the superposition signal of the received input current feedback and the input voltage feedback, so that the isolation inverter circuit 10 adjusts the phase of the fundamental current of the received power supply signal to be closer to the phase of the fundamental voltage, so as to increase the output power, or to improve the power factor of the charger. Among them, the sixteenth resistor R16 is connected in parallel on both sides of the series structure formed by the fourteenth resistor R14 and the fifteenth resistor R15, and is used to increase the current value generated by the current transformer T2.

[0080] Further, in this embodiment, the charger further includes: an output current acquisition circuit 110, the output current acquisition circuit 110 includes a Hall sensor HE, a seventeenth resistor R17 to a twenty-fifth resistor R25, a first operational amplifier A1, a second operational amplifier A2, a ninth capacitor C9 to a twelfth capacitor C12 and a first coupling device;

[0081] The first end of the Hall sensor HE is connected to the second output end of the isolation inverter circuit 10, the second end of the Hall sensor HE is connected to the second end of the load 50, the third end of the Hall sensor HE is connected to the seventeenth resistor R17, and the fourth end of the Hall sensor HE is connected to the eighteenth resistor R18. The reverse input end of the first operational amplifier A1 is respectively connected to the second end of the seventeenth resistor R17, the first end of the ninth capacitor C9, and the first end of the nineteenth resistor R19. The positive input end of the first operational amplifier A1 is respectively connected to the second end of the eighteenth resistor R18, the first end of the twentieth resistor R20, and the first end of the tenth capacitor C10. The output end of the first operational amplifier A1 is respectively connected to the second end of the nineteenth resistor R19, the second end of the ninth capacitor C9, and the first end of the twenty-first resistor R21; the second end of the twentieth resistor R20 and the second end of the tenth capacitor C10 are grounded;

[0082] The reverse input terminal of the second operational amplifier A2 is respectively connected to the second end of the twenty-first resistor R21, the first end of the twenty-third resistor R23 and the first end of the eleventh capacitor C11, the forward input terminal of the second operational amplifier A2 is connected to the second end of the twenty-second resistor R22, and the output terminal of the second operational amplifier A2 is respectively connected to the second end of the eleventh capacitor C11, the second end of the twelfth capacitor C12 and the first end of the twenty-fourth resistor R24; the second end of the twenty-third resistor R23 is connected to the first end of the twelfth capacitor C12; the second end of the twenty-fourth resistor R24 ​​is connected to the anode of the first optical coupler OC1, the cathode of the first optical coupler OC1 is grounded, the collector of the first optical coupler OC1 is connected to the second end of the twenty-fifth resistor R25, and the emitter of the first optical coupler OC1 is grounded; the first end of the twenty-fifth resistor R25 is connected to the second end of the seventh resistor R7; the first end of the twenty-second resistor R22 is used to receive a current given signal.

[0083] It should be noted that, in this embodiment, the output current acquisition circuit 110 can be used to collect the current value of the power supply signal output by the isolated inverter circuit 10, and adjust the electrical parameters of the PWM signal formed by the control circuit 30 based on the collected current value, thereby adjusting the output power of the isolated inverter circuit 10.

[0084] In a specific implementation, the output current flowing from the second low-voltage end of the isolation transformer T1 to the second end (DC-node) of the load 50 can be collected through the characteristics of the Hall sensor HE to form a pair of differential signals, and the differential signals are differentially amplified by a differential amplifier circuit composed of the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the ninth capacitor C9, the tenth capacitor C10 and the first operational amplifier A1 to form a corresponding differential amplified signal. The obtained differential amplified signal and the current given signal with a constant current value preset by the user are then transmitted to an integration circuit formed by the twenty-first resistor R21, the twenty-second resistor R22, the twenty-third resistor R23, the twenty-fourth resistor R24, the eleventh capacitor C11, the twelfth capacitor C12 and the second operational amplifier A2 to obtain the output current integral to the first optical coupler device OC1. The first optocoupler device OC1 can control the potential of the base of the second N-type transistor Vn2 to change based on the output current integral, and the voltage feedback amount transmitted by the input voltage acquisition circuit 90 received by the sampling terminal CS of the control circuit 30 changes accordingly, thereby changing the electrical parameters of the PWM signal output by the control circuit 30, and further completing the adjustment of the output power of the isolated inverter circuit 10.

[0085] Further, in this embodiment, the charger further includes: an output voltage acquisition circuit 120, the output voltage acquisition circuit 120 includes a twenty-sixth resistor R26 to a thirty-sixth resistor R36, a first voltage stabilizing diode Dw1, a second optocoupler device OC2, a third optocoupler device OC3, a thirteenth capacitor C13, a fourteenth capacitor C14, an isolation operational amplifier Ag, a third operational amplifier A3 and a fourth operational amplifier A4;

[0086] The first end of the twenty-sixth resistor R26 is respectively connected to the cathode of the fourth diode D4 and the first end of the twenty-eighth resistor R28, the second end of the twenty-sixth resistor R26 is respectively connected to the first end of the twenty-seventh resistor R27 and the input end of the isolation operational amplifier Ag, the second end of the twenty-eighth resistor R28 is connected to the cathode of the first voltage-stabilizing diode Dw1, the anode of the first voltage-stabilizing diode Dw1 is connected to the anode of the second optical coupler device OC2, the cathode of the second optical coupler device OC2 and the second end of the twenty-seventh resistor R27 are connected to the second end of the load 50, and the second optical coupler device OC2 is connected to the second end of the load 50. The collector of the device OC2 is connected to the compensation end of the control circuit 30, and the emitter of the second optical coupling device OC2 is grounded; the control end of the isolation operational amplifier Ag is connected to the second end of the load 50, the positive output end of the isolation operational amplifier Ag is connected to the first end of the twenty-ninth resistor R29, and the reverse output end of the isolation operational amplifier Ag is connected to the first end of the thirtieth resistor R30; the positive input end of the third operational amplifier A3 is respectively connected to the second end of the twenty-ninth resistor R29, the first end of the thirty-first resistor R31 and the first end of the thirteenth capacitor C13, and the third operational amplifier A The reverse input end of the fourth operational amplifier A4 is connected to the second end of the thirty-third resistor R33, the first end of the thirty-second resistor R32 and the first end of the fourteenth capacitor C14, the output end of the third operational amplifier A3 is connected to the second end of the thirty-second resistor R32, the second end of the fourteenth capacitor C14 and the first end of the thirty-third resistor R33, the second end of the thirty-first resistor R31 and the second end of the thirteenth capacitor C13 are grounded, the reverse input end of the fourth operational amplifier A4 is connected to the second end of the thirty-third resistor R33, the positive input end of the fourth operational amplifier A4 is connected to the second end of the thirty-third resistor R33, and the positive input end of the fourth operational amplifier A4 is connected to the second end of the thirty-third resistor R33. The second end of the thirty-fourth resistor R34 and the second end of the thirty-fifth resistor R35, and the output end of the fourth operational amplifier A4 are respectively connected to the first end of the thirty-fifth resistor R35 and the cathode of the third optocoupler OC3; the anode of the third optocoupler OC3 is connected to the second end of the thirty-sixth resistor R36, the collector of the third optocoupler OC3 is connected to the compensation end of the control circuit 30, and the emitter of the third optocoupler OC3 is grounded; the first end of the thirty-sixth resistor R36 is connected to the second power supply VCC2; the first end of the thirty-fourth resistor R34 is used to receive a voltage given signal.

[0087] It should be noted that, in this embodiment, the output voltage acquisition circuit 120 can be used to collect the output voltage value of the power supply signal output by the isolated inverter circuit 10, and adjust the electrical parameters of the PWM signal formed by the control circuit 30 based on the collected output voltage value, thereby adjusting the output power of the isolated inverter circuit 10.

[0088] It should be noted that, in this embodiment, the second power source VCC2 may be another DC power source with a fixed voltage value, and its specific output voltage may be 5V.

[0089] It is easy to understand that the output voltage between the Vout node and the DC-node can be collected based on the Vout node through the voltage-dividing structure formed by the twenty-sixth resistor R26 and the twenty-seventh resistor R27, which can also be understood as transmitting the collected output voltage divided voltage to the input end of the isolation operational amplifier Ag through the VF node. The control end of the isolation operational amplifier Ag is connected to the DC-node. When receiving the divided voltage transmitted by the VF node, another set of differential signals can be generated, and differential amplification processing is performed through the differential amplifier circuit formed by the twenty-ninth resistor R29, the thirtieth resistor R30, the thirty-first resistor R31, the thirty-second resistor R32, the thirteenth capacitor C13, the fourteenth capacitor C14 and the third operational amplifier A3 to obtain the corresponding differential amplified signal. The differential amplified signal and the voltage given signal of the fixed voltage value set in advance by the user are transmitted to the voltage comparison circuit formed by the thirty-third resistor R33, the thirty-fourth resistor R34, and the thirty-fifth resistor R35. Based on the comparison result between the differential amplified signal and the voltage given signal, the working state of the third optical coupler OC3 is controlled, thereby controlling the pulse ratio of the electrical signal received by the compensation end of the control circuit 30 to change the electrical parameters of the PWM signal generated by the control circuit 30, thereby completing the adjustment of the output power of the isolated inverter circuit 10. The thirty-sixth resistor R36 is used to limit the current value flowing through the third optical coupler OC3 to protect the third optical coupler OC3 from being damaged due to overcurrent.

[0090] Further, in the present embodiment, the charger further includes: a discharge circuit 130, the discharge circuit 130 including a thirty-seventh resistor R37 to a forty-third resistor R43, a second voltage stabilizing diode Dw2, a third voltage stabilizing diode Dw3, a sixth diode D6, a light emitting diode LED, a fourth optocoupler device OC4, a fifth optocoupler device OC5, a second P-type transistor Vp2, a fifteenth capacitor C15, a sixteenth capacitor C16 and a second NMOS transistor Qn2;

[0091] The first end of the thirty-seventh resistor R37 is respectively connected to the first end of the load 50 and the first end of the thirty-eighth resistor R38, the second end of the thirty-seventh resistor R37 is respectively connected to the cathode of the second voltage stabilizing diode Dw2 and the anode of the sixth diode D6, the cathode of the sixth diode D6 is respectively connected to the first end of the fifteenth capacitor C15 and the first end of the thirty-ninth resistor R39, the second end of the thirty-ninth resistor R39 is respectively connected to the collector of the fourth optocoupler OC4, the first end of the fortieth resistor and the gate of the second NMOS transistor Qn2, the drain of the second NMOS transistor Qn2, the second end of the fortieth resistor, the emitter of the fourth optocoupler OC4, the second end of the fifteenth capacitor C15 and the anode of the second voltage stabilizing diode Dw2 are connected to the second end of the load 50; the second end of the thirty-eighth resistor R38 is connected to the source of the second NMOS transistor Qn2; the anode of the fourth optocoupler OC4 is connected to the fifth optocoupler OC5, and the cathode of the fourth optocoupler OC4 is grounded;

[0092] The anode of the fifth optocoupler OC5 is connected to the second end of the forty-first resistor R41, the collector of the fifth optocoupler OC5 is connected to the first end of the forty-second resistor R42, and the emitter of the fifth optocoupler OC5 is grounded; the second end of the forty-second resistor R42 is connected to the anode of the third voltage-stabilizing diode Dw3, the cathode of the third voltage-stabilizing diode Dw3 is connected to the cathode of the light-emitting diode LED, the anodes of the light-emitting diode LED are respectively connected to the base of the second P-type transistor Vp2, the emitter of the second P-type transistor Vp2 is connected to the second end of the forty-third resistor R43, and the collector of the second P-type transistor Vp2 is respectively connected to the power supply end of the control circuit 30 and the first end of the sixteenth capacitor C16; the first end of the forty-third resistor R43 is connected to the first power supply VCC1; the second end of the sixteenth capacitor C16 is grounded; the first end of the forty-first resistor R41 is used to receive an open wave signal.

[0093] It should be noted that, in this embodiment, since there is an eighth capacitor C8 for filtering and having a large capacity on the side of the load 50, when the load 50 is fully charged and disconnected from the DC+ node and the DC- node, the DC+ node and the DC- node will be charged. In order to avoid electric shock to the user, when the DC+ node is disconnected from the DC- node, discharge will be performed, that is, the function of the discharge circuit 130. During the discharge process, the current is transmitted to the fifteenth capacitor C15 through the thirty-seventh resistor R37 and the sixth diode D6, and the fifteenth capacitor C15 is charged. At the same time, due to the presence of the second voltage stabilizing diode Dw2, the voltage of the gate of the second NMOS tube Qn2 will be clamped at the voltage required for conduction, that is, the second NMOS tube Qn2 enters the conduction state, and the DC+ node is grounded through the thirty-eighth resistor R38 and the second NMOS tube Qn2 to achieve discharge.

[0094] In addition, when the charger needs to work normally, it can receive an externally transmitted start-wave signal to turn on the fifth optocoupler device OC5, and at the same time, the fourth optocoupler device OC4 is also turned on, and the potential of the gate of the second NMOS tube Qn2 is pulled down to zero, and the second NMOS tube Qn2 is cut off, so that the discharge process of the charger can be stopped. Among them, the thirty-ninth resistor R39 is used for current limiting to prevent the fourth optocoupler device OC4 from being damaged due to excessive current received. The fortieth resistor is used to provide a bias voltage between the gate and the source of the second NMOS tube Qn2 to ensure that the second NMOS tube Qn2 can work normally.

[0095] It should also be noted that the 41st resistor R41 is used to limit the current of the fourth optocoupler OC4 and the fifth optocoupler OC5 to prevent the light-emitting diode LED in the fourth optocoupler OC4 and the light-emitting diode LED in the fifth optocoupler OC5 from being damaged due to excessive current received; the 42nd resistor R42 is used to limit the current of the fifth optocoupler OC5 and the fifth optocoupler OC5 to prevent the photoelectric conversion structure in the fifth optocoupler OC5 from being damaged due to excessive current received. When the fifth optocoupler OC5 is working, the third voltage-stabilizing diode Dw3 reversely breaks down, the second P-type transistor Vp2 is turned on, and the light-emitting diode LED lights up to indicate that the charger is in working state, and the power supply end of the control circuit 30 can receive the power supply provided by the second power supply VCC2. Among them, the 16th capacitor C16 is used to filter the power supply sent to the power supply end of the control circuit 30 to ensure the working stability of the control circuit 30.

[0096] Further, in this embodiment, the charger further includes: a temperature protection circuit 140, the temperature protection circuit 140 includes a first temperature-sensitive resistor RT1, a second temperature-sensitive resistor RT2, a third temperature-sensitive resistor RT3, a forty-fourth resistor R44 to a fifty-fifth resistor R55, a third N-type transistor Vn3, a seventeenth capacitor C17, a seventh diode D7 to a tenth diode D10, a fifth operational amplifier A5, a sixth operational amplifier A6 and a sixth optical coupler OC6;

[0097] The first temperature-sensitive resistor RT1 is arranged around the first NMOS transistor, the first end of the first temperature-sensitive resistor RT1 is respectively connected to the first end of the forty-sixth resistor R46, the first end of the seventeenth capacitor C17, the second end of the forty-fifth resistor R45 and the base of the third N-type transistor Vn3, the second end of the first temperature-sensitive resistor RT1, the second end of the forty-sixth resistor R46, the second end of the seventeenth capacitor C17 and the emitter of the third N-type transistor Vn3 are grounded; the first end of the forty-fifth resistor R45 is connected to the third power supply VCC3; the collector of the third N-type transistor Vn3 is connected to the second end of the forty-fourth resistor R44, and the first end of the forty-fourth resistor R44 is connected to the cathode of the fifth diode D5;

[0098] The second temperature-sensitive resistor RT2 is arranged around the isolation transformer T1, the first end of the second temperature-sensitive resistor RT2 is respectively connected to the positive input end of the fifth operational amplifier A5, the second end of the forty-seventh resistor R47 and the second end of the fiftieth resistor R50, and the second end of the second temperature-sensitive resistor RT2 is grounded; the reverse input end of the fifth operational amplifier A5 is respectively connected to the second end of the forty-eighth resistor R48 and the first end of the forty-ninth resistor R49, and the output end of the fifth operational amplifier A5 is respectively connected to the cathode of the seventh diode D7 and the cathode of the eighth diode D8; the first end of the forty-seventh resistor R47 and the first end of the forty-eighth resistor R48 are connected to the third power supply VCC3, and the second end of the forty-ninth resistor R49 is grounded; the second end of the fiftieth resistor R50 is connected to the anode of the seventh diode D7;

[0099] The third temperature-sensitive resistor RT3 is arranged at the center of the charger, the first end of the third temperature-sensitive resistor RT3 is respectively connected to the second end of the fifty-first resistor R51, the first end of the fifty-fourth resistor R54 and the positive input end of the sixth operational amplifier A6, and the second end of the third temperature-sensitive resistor RT3 is grounded; the reverse input end of the sixth operational amplifier A6 is respectively connected to the second end of the fifty-second resistor R52 and the first end of the fifty-third resistor R53, and the output end of the sixth operational amplifier A6 is respectively connected to the cathode of the ninth diode D9 and the cathode of the tenth diode D10; the first end of the fifty-first resistor R51 and the first end of the fifty-second resistor R52 are connected to the third power supply VCC3, and the second end of the fifty-third resistor R53 is grounded; the second end of the fifty-fourth resistor R54 is connected to the anode of the ninth diode D9;

[0100] The anode of the eighth diode D8 is respectively connected to the cathode of the sixth optocoupler OC6 and the anode of the tenth diode D10; the anode of the sixth optocoupler OC6 is connected to the second end of the fifty-fifth resistor R55, the collector of the sixth optocoupler OC6 is connected to the compensation end of the control circuit 30, and the emitter of the sixth optocoupler OC6 is grounded; the first end of the fifty-fifth resistor R55 is connected to the second power supply VCC2.

[0101] It should be noted that the working temperature of the charger will affect the output power. If the working temperature of the charger is abnormal, some electronic components in the charger may be damaged and need to be protected in time. In this embodiment, the first temperature-sensitive resistor RT1, the second temperature-sensitive resistor RT2 and the third temperature-sensitive resistor RT3 in the temperature protection circuit 140 can detect the switch temperature of the first NMOS tube in the drive circuit 20, the transformer temperature of the isolation transformer T1 in the isolation inverter circuit 10 and the ambient temperature in the entire charger respectively. When any one of the switch temperature, the transformer temperature and the ambient temperature exceeds the corresponding set temperature, the control circuit 30 stops working to protect the electronic components inside the charger from being damaged.

[0102] It should be understood that the third power supply VCC3 is another DC power supply with a fixed voltage value, and its specific output voltage may be 12V.

[0103] In a specific implementation, the first temperature-sensitive resistor RT1 is arranged near the first NMOS tube, and as the switch temperature of the first NMOS tube continues to rise, the resistance of the first temperature-sensitive resistor RT1 continues to decrease. The 44th resistor R44, the 45th resistor R45, the 46th resistor R46, the 17th capacitor C17 and the third N-type transistor Vn3 together form a linear amplifier circuit. When the switch temperature exceeds the corresponding set temperature, the resistance of the first temperature-sensitive resistor RT1 reaches the first preset resistance, so that the base current of the first N-type transistor Vn1 increases linearly, the potential at the cathode of the fifth diode D5 decreases, and the input current feedback amount received at the sampling terminal CS of the control circuit 30 decreases, so that the control circuit 30 stops working.

[0104] In addition, the second temperature-sensitive resistor RT2 is arranged near the isolation transformer T1, and as the transformer temperature of the isolation transformer T1 continues to rise, the resistance value of the second temperature-sensitive resistor RT2 continues to decrease. At the same time, the forty-seventh resistor R47, the second temperature-sensitive resistor RT2, the forty-eighth resistor R48, the forty-ninth resistor R49, the fiftieth resistor R50, the seventh diode D7, the eighth diode D8 and the fifth operational amplifier A5 together form a voltage comparison circuit, the forty-seventh resistor R47 and the second temperature-sensitive resistor RT2 form a voltage-dividing structure, and the forty-eighth resistor R48 and the forty-ninth resistor R49 form another voltage-dividing structure. When the second temperature-sensitive resistor RT2 detects that the transformer temperature exceeds the corresponding preset temperature, the voltage division structure formed by the 47th resistor R47 and the second temperature-sensitive resistor RT2 outputs the third power supply VCC3 lower than the voltage division structure formed by the 48th resistor R48 and the 49th resistor R49, and the fifth operational amplifier A5 outputs a low level, so that the connection loop from the second power supply VCC2, the 55th resistor R55, the sixth optical coupler OC6, and the eighth diode D8 to the output end of the fifth operational amplifier A5 is turned on, and the sixth optical coupler OC6 is turned on, so that the voltage received by the compensation end of the control circuit 30 is reduced, and the control circuit 30 stops working. Similar to the second temperature-sensitive resistor RT2, the third temperature-sensitive resistor RT3 is set at the center of the charger. As the ambient temperature inside the charger continues to rise, the resistance value of the third temperature-sensitive resistor RT3 continues to decrease. At the same time, the fifty-first resistor R51, the third temperature-sensitive resistor RT3, the fifty-second resistor R52, the fifty-third resistor R53, the fifty-fourth resistor R54, the ninth diode D9, the tenth diode D10 and the sixth operational amplifier A6 together form a voltage comparison circuit, the fifty-first resistor R51 and the third temperature-sensitive resistor RT3 form a voltage-dividing structure, and the fifty-second resistor R52 and the fifty-third resistor R53 form another voltage-dividing structure. When the third temperature-sensitive resistor RT3 detects that the ambient temperature exceeds the corresponding preset temperature, the voltage-dividing structure formed by the fifty-first resistor R51 and the third temperature-sensitive resistor RT3 outputs a voltage-dividing structure of the third power supply VCC3 lower than the voltage-dividing structure formed by the fifty-second resistor R52 and the fifty-third resistor R53, and the sixth operational amplifier A6 outputs a low level, so that the connection loop from the second power supply VCC2, the fifty-fifth resistor R55, the sixth optical coupler OC6, and the tenth diode D10 to the output end of the sixth operational amplifier A6 is turned on, and the sixth optical coupler OC6 is turned on, so that the voltage received by the compensation end of the control circuit 30 is reduced, and the control circuit 30 stops working. The seventh diode D7 , the eighth diode D8 , the ninth diode D9 and the tenth diode D10 are used to prevent the voltages of the third power source VCC3 and the fourth power source from flowing back to each other.

[0105] Further, in this embodiment, the control circuit 30 includes: a fourth voltage stabilizing diode Dw4, a fifty-sixth resistor R56 to a fifty-eighth resistor R58, an eighteenth capacitor C18, a nineteenth capacitor, an eleventh diode D11 and a control chip U0;

[0106] The power supply pin of the control chip U0 is respectively connected to the collector of the second P-type transistor Vp2 and the first end of the fifty-seventh resistor R57, the output pin of the control chip U0 is connected to the second end of the fourth resistor R4, the sampling pin of the control chip U0 is connected to the second end of the thirteenth resistor R13, and the compensation pin of the control chip U0 is respectively connected to the collector of the sixth optocoupler OC6, the collector of the second optocoupler OC2, the collector of the third optocoupler OC3, the cathode of the fourth voltage-stabilizing diode Dw4, the first end of the fifty-sixth resistor R56, the first end of the eighteenth capacitor C18 and the anode of the eleventh diode D11; the cathode of the eleventh diode D11 is respectively connected to the first end of the nineteenth capacitor, the first end of the fifty-seventh resistor R57 and the second end of the fifty-eighth resistor R58; the anode of the fourth voltage-stabilizing diode Dw4, the second end of the fifty-sixth resistor R56, the second end of the eighteenth capacitor C18, the second end of the nineteenth capacitor and the second end of the fifty-eighth resistor R58 are grounded.

[0107] It should be noted that, in the present embodiment, the control chip U0 may be a power control chip U0, and its sampling pin is the sampling terminal CS of the control circuit 30, which is used to collect the input current feedback amount fed back by the input current collection circuit 100 and the input voltage feedback amount fed back by the input voltage collection circuit 90 and other feedback amounts, such as the electrical signal fed back by the temperature protection circuit 140. The power supply pins of the control chip U0 are respectively connected to the collector of the second P-type transistor Vp2, and are used to receive the power supply after the second P-type transistor Vp2 amplifies the current output by the second power supply VCC2. The output pin of the control chip U0 is the output terminal of the control circuit 30, that is, the OUT node. The compensation pins of the control chip U0 are respectively connected to the collector of the second optocoupler device OC2, the collector of the third optocoupler, and the collector of the sixth optocoupler.

[0108] In this embodiment, the fourth voltage stabilizing diode Dw4 is used to clamp the voltage between the compensation pin and the ground line of the control chip U0, and stabilize the voltage when the voltage received by the compensation pin exceeds the maximum voltage that the compensation pin can withstand. The fifty-sixth resistor R56 and the eighteenth capacitor C18 form an RC delay circuit to prevent the voltage received at the compensation pin from jumping due to the on-off state switching of each optical coupler, thereby affecting the working stability of the control chip U0. The fifty-seventh resistor R57, the fifty-eighth resistor R58, the eleventh diode D11 and the eighteenth capacitor C18 form a slow start circuit, so that the eighteenth capacitor C18 needs to be charged first before the voltage at the compensation pin can be increased, so that after the control chip U0 is started, the pulse width of the PWM signal output by the output pin gradually expands.

[0109] Furthermore, in this embodiment, the charger further includes: a pre-charging circuit 150, wherein the pre-charging circuit 150 includes a fifty-ninth resistor R59 and a relay K1;

[0110] The first end of the fifty-ninth resistor R59 is respectively connected to the cathode of the fourth diode D4 and the first end of the relay K1, the second end of the fifty-ninth resistor R59 is respectively connected to the first end of the load 50 and the second end of the fifty-ninth resistor R59, and the control end of the relay K1 is connected to the communication terminal 160.

[0111] It should be noted that, in this embodiment, the charger also has a pre-charging circuit 150, which is controlled by the communication terminal 160. Before the DC+ node and the DC- node are powered on, the communication terminal 160 sends a corresponding shutdown command to control the relay K1 to disconnect, and the power supply signal is transmitted to the load 50 through the fifty-ninth resistor R59 with a large resistance value. The fifty-ninth resistor R59 can prevent the charger from generating a huge instantaneous current when the load 50 is connected, causing the load 50 to lose. When the voltage across the load 50 or the received current is stable, the communication terminal 160 sends a corresponding opening command to control the relay K1 to close, short-circuit the fifty-ninth resistor R59, and directly transmit the power supply signal to the load 50 to reduce the output voltage loss and power loss.

[0112] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A charger, characterized in that: The charger comprises: an isolation inverter circuit, a drive circuit and a control circuit; The input end of the isolation inverter circuit is connected to the power supply, the first output end and the second output end of the isolation inverter circuit are respectively connected to the two ends of the load, the control end of the isolation inverter circuit is connected to the output end of the drive circuit; the input end of the drive circuit is connected to the control circuit; The control circuit is used to output a PWM signal to the drive circuit; The driving circuit is used to send a driving signal to the isolated inverter circuit when receiving the PWM signal; The isolated inverter circuit is used to transform the power supply signal output by the power supply when receiving the driving signal, and send the transformed power supply signal to the load; The isolated inverter circuit is also used to adjust the phase difference between the fundamental wave current and the fundamental wave voltage of the power supply signal to increase the output power of the power supply signal.

2. The charger according to claim 1, characterized in that: The isolated inverter circuit comprises: a first diode, a first resistor, a second resistor, a first capacitor, a first NMOS transistor and an isolation transformer; The first high-voltage end of the isolation transformer is respectively connected to the power supply and the cathode of the first diode, the second high-voltage end of the isolation transformer is respectively connected to the first end of the first resistor, the first end of the first capacitor and the drain of the first NMOS tube, the first low-voltage end of the isolation transformer is connected to the first end of the load, and the second low-voltage end of the isolation transformer is connected to the second end of the load; the source of the first NMOS tube is grounded, and the gate of the first NMOS tube is connected to the output end of the drive circuit; the second end of the first resistor is respectively connected to the second end of the first capacitor and the anode of the first diode.

3. The charger according to claim 2, characterized in that: The driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, a second diode, a third diode, a second capacitor, a first N-type transistor and a first P-type transistor; The first end of the third resistor is respectively connected to the control end of the isolation inverter circuit and the first end of the fourth resistor, the second end of the third resistor is respectively connected to the anode of the second diode and the first end of the second capacitor, and the second end of the fourth resistor is connected to the anode of the third diode; the cathode of the third diode is grounded; the cathode of the second diode is respectively connected to the second end of the second capacitor, the emitter of the first N-type transistor and the collector of the first P-type transistor; the base of the first N-type transistor is respectively connected to the first end of the fifth resistor and the base of the first P-type transistor, and the collector of the first N-type transistor is connected to the first power supply; the emitter of the first P-type transistor is grounded; the second end of the fifth resistor is connected to the first output end of the control circuit.

4. The charger according to claim 3, characterized in that: The charger further includes: an EMC circuit, a first rectifying and filtering circuit and a second rectifying and filtering circuit, the EMC circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a common mode inductor, the first rectifying and filtering circuit includes a seventh capacitor, a sixth resistor and a first rectifying bridge, the second rectifying and filtering circuit includes a fourth diode and an eighth capacitor; the power supply is an AC power supply; The input pins of the common-mode inductor are respectively connected to the positive electrode of the AC power supply and the first end of the third capacitor, the output pins of the common-mode inductor are respectively connected to the first end of the fourth capacitor, the first end of the fifth capacitor and the first input end of the first rectifier bridge, the first ground pins of the common-mode inductor are respectively connected to the negative electrode of the AC power supply and the second end of the third capacitor, the second ground pins of the common-mode inductor are respectively connected to the second end of the fourth capacitor, the first end of the sixth capacitor and the second input end of the first rectifier bridge; the second end of the fifth capacitor and the second end of the sixth capacitor are grounded; The first output end of the first rectifier bridge is respectively connected to the first end of the seventh capacitor, the first end of the sixth resistor and the input end of the isolation inverter circuit, and the second output end of the first rectifier bridge is respectively connected to the second end of the seventh capacitor and the second end of the sixth resistor; The anode of the fourth diode is connected to the first output end of the isolation inverter circuit, the cathode of the fourth diode is respectively connected to the first end of the eighth capacitor and the first end of the load, and the second end of the eighth capacitor is respectively connected to the second output end of the isolation inverter circuit and the second end of the load.

5. The charger according to claim 4, characterized in that: The charger further includes: an input voltage acquisition circuit and an input current acquisition circuit, wherein the input voltage acquisition circuit includes a second rectifier bridge, seventh to thirteenth resistors and a second N-type transistor, and the input current acquisition circuit includes fourteenth to sixteenth resistors, a current transformer and a fifth diode; The first input end of the second rectifier bridge is connected to the positive electrode of the AC power supply, the second input end of the second rectifier bridge is connected to the negative electrode of the AC power supply, the first output end of the second rectifier bridge is connected to the first end of the seventh resistor, the second output end of the second rectifier bridge, the second end of the eighth resistor and the emitter of the second N-type transistor are grounded; the second end of the seventh resistor is respectively connected to the first end of the eighth resistor and the first end of the ninth resistor; the second end of the ninth resistor is respectively connected to the base of the second N-type transistor and the second end of the tenth resistor; the first end of the tenth resistor is respectively connected to the second end of the eleventh resistor, the first end of the twelfth resistor and the collector of the second N-type transistor, the first end of the eleventh resistor is connected to the third power supply, the second end of the twelfth resistor is connected to the first end of the thirteenth resistor, and the second end of the thirteenth resistor is connected to the sampling end of the control circuit; The second end of the fourteenth resistor and the first end of the fifteenth resistor are also connected to the sampling end of the control circuit, and the first end of the fourteenth resistor is respectively connected to the first end of the sixteenth resistor and the cathode of the fifth diode; the second end of the fifteenth resistor and the second end of the sixteenth resistor are grounded; the anode of the fifth diode is connected to the second current inflow end of the current transformer, the second current outflow end of the current transformer is grounded, the first current inflow end of the current transformer is connected to the first output end of the first rectifier bridge, and the second current outflow end of the current transformer is connected to the input end of the isolation inverter circuit.

6. The charger according to claim 5, characterized in that: The charger further includes: an output current collection circuit, the output current collection circuit including a Hall sensor, a seventeenth resistor to a twenty-fifth resistor, a first operational amplifier, a second operational amplifier, a ninth capacitor to a twelfth capacitor, and a first optical coupler; The first end of the Hall sensor is connected to the second output end of the isolation inverter circuit, the second end of the Hall sensor is connected to the second end of the load, the third end of the Hall sensor is connected to the seventeenth resistor, and the fourth end of the Hall sensor is connected to the eighteenth resistor, the reverse input end of the first operational amplifier is respectively connected to the second end of the seventeenth resistor, the first end of the ninth capacitor and the first end of the nineteenth resistor, the forward input end of the first operational amplifier is respectively connected to the second end of the eighteenth resistor, the first end of the twentieth resistor and the first end of the tenth capacitor, the output end of the first operational amplifier is respectively connected to the second end of the nineteenth resistor, the second end of the ninth capacitor and the first end of the twenty-first resistor; the second end of the twentieth resistor and the second end of the tenth capacitor are grounded; The reverse input terminal of the second operational amplifier is respectively connected to the second end of the twenty-first resistor, the first end of the twenty-third resistor and the first end of the eleventh capacitor, the forward input terminal of the second operational amplifier is connected to the second end of the twenty-second resistor, and the output terminal of the second operational amplifier is respectively connected to the second end of the eleventh capacitor, the second end of the twelfth capacitor and the first end of the twenty-fourth resistor; the second end of the twenty-third resistor is connected to the first end of the twelfth capacitor; the second end of the twenty-fourth resistor is connected to the anode of the first optocoupler device, the cathode of the first optocoupler device is grounded, the collector of the first optocoupler device is connected to the second end of the twenty-fifth resistor, and the emitter of the first optocoupler device is grounded; the first end of the twenty-fifth resistor is connected to the second end of the seventh resistor; the first end of the twenty-second resistor is used to receive a current given signal.

7. The charger according to claim 6, characterized in that: The charger further includes: an output voltage collection circuit, the output voltage collection circuit including the twenty-sixth resistor to the thirty-sixth resistor, a first voltage stabilizing diode, a second optocoupler, a third optocoupler, a thirteenth capacitor, a fourteenth capacitor, an isolation operational amplifier, a third operational amplifier, and a fourth operational amplifier; The first end of the twenty-sixth resistor is respectively connected to the cathode of the fourth diode and the first end of the twenty-eighth resistor, the second end of the twenty-sixth resistor is respectively connected to the first end of the twenty-seventh resistor and the input end of the isolation operational amplifier, the second end of the twenty-eighth resistor is connected to the cathode of the first voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is connected to the anode of the second optocoupler, the cathode of the second optocoupler and the second end of the twenty-seventh resistor are connected to the second end of the load, the collector of the second optocoupler is connected to the compensation end of the control circuit, and the emitter of the second optocoupler is grounded; the control end of the isolation operational amplifier is connected to the second end of the load, the positive output end of the isolation operational amplifier is connected to the first end of the twenty-ninth resistor, and the reverse output end of the isolation operational amplifier is connected to the first end of the thirtieth resistor; the positive input end of the third operational amplifier is respectively connected to the second end of the twenty-ninth resistor, the first end of the thirty-first resistor and the first end of the thirteenth capacitor, and the third operational amplifier The reverse input end of the amplifier is respectively connected to the second end of the 30th resistor, the first end of the 32nd resistor and the first end of the 14th capacitor, the output end of the third operational amplifier is respectively connected to the second end of the 32nd resistor, the second end of the 14th capacitor and the first end of the 33rd resistor; the second end of the 31st resistor and the second end of the 13th capacitor are grounded; the reverse input end of the fourth operational amplifier is connected to the second end of the 33rd resistor, the positive input end of the fourth operational amplifier is respectively connected to the second end of the 34th resistor and the second end of the 35th resistor, the output end of the fourth operational amplifier is respectively connected to the first end of the 35th resistor and the cathode of the third optocoupler; the anode of the third optocoupler is connected to the second end of the 36th resistor, the collector of the third optocoupler is connected to the compensation end of the control circuit, and the emitter of the third optocoupler is grounded; the first end of the 36th resistor is connected to the second power supply; the first end of the 34th resistor is used to receive a voltage given signal.

8. The charger according to claim 7, characterized in that: The charger further includes: a discharge circuit, wherein the discharge circuit includes a thirty-seventh resistor to a forty-third resistor, a second voltage-stabilizing diode, a third voltage-stabilizing diode, a sixth diode, a light-emitting diode, a fourth optocoupler, a fifth optocoupler, a second P-type transistor, a fifteenth capacitor, a sixteenth capacitor, and a second NMOS transistor; The first end of the thirty-seventh resistor is respectively connected to the first end of the load and the first end of the thirty-eighth resistor, the second end of the thirty-seventh resistor is respectively connected to the cathode of the second voltage-stabilizing diode and the anode of the sixth diode, the cathode of the sixth diode is respectively connected to the first end of the fifteenth capacitor and the first end of the thirty-ninth resistor, the second end of the thirty-ninth resistor is respectively connected to the collector of the fourth optocoupler, the first end of the fortieth resistor and the gate of the second NMOS tube, the drain of the second NMOS tube, the second end of the fortieth resistor, the emitter of the fourth optocoupler, the second end of the fifteenth capacitor and the anode of the second voltage-stabilizing diode are connected to the second end of the load; the second end of the thirty-eighth resistor is connected to the source of the second NMOS tube; the anode of the fourth optocoupler is connected to the fifth optocoupler, and the cathode of the fourth optocoupler is grounded; The anode of the fifth optocoupler is connected to the second end of the forty-first resistor, the collector of the fifth optocoupler is connected to the first end of the forty-second resistor, and the emitter of the fifth optocoupler is grounded; the second end of the forty-second resistor is connected to the anode of the third voltage-stabilizing diode, the cathode of the third voltage-stabilizing diode is connected to the cathode of the light-emitting diode, the anode of the light-emitting diode is respectively connected to the base of the second P-type transistor, the emitter of the second P-type transistor is connected to the second end of the forty-third resistor, and the collector of the second P-type transistor is respectively connected to the power supply end of the control circuit and the first end of the sixteenth capacitor; the first end of the forty-third resistor is connected to the first power supply; the second end of the sixteenth capacitor is grounded; the first end of the forty-first resistor is used to receive an open wave signal.

9. The charger according to claim 8, characterized in that: The charger further includes: a temperature protection circuit, wherein the temperature protection circuit includes a first temperature-sensitive resistor, a second temperature-sensitive resistor, a third temperature-sensitive resistor, a 44th resistor to a 55th resistor, a third N-type transistor, a 17th capacitor, a 7th diode to a 10th diode, a 5th operational amplifier, a 6th operational amplifier, and a 6th optocoupler; The first temperature-sensitive resistor is arranged around the first NMOS transistor, the first end of the first temperature-sensitive resistor is respectively connected to the first end of the forty-sixth resistor, the first end of the seventeenth capacitor, the second end of the forty-fifth resistor and the base of the third N-type transistor, the second end of the first temperature-sensitive resistor, the second end of the forty-sixth resistor, the second end of the seventeenth capacitor and the emitter of the third N-type transistor are grounded; the first end of the forty-fifth resistor is connected to the third power supply; the collector of the third N-type transistor is connected to the second end of the forty-fourth resistor, and the first end of the forty-fourth resistor is connected to the cathode of the fifth diode; The second temperature-sensitive resistor is arranged around the isolation transformer, the first end of the second temperature-sensitive resistor is respectively connected to the positive input end of the fifth operational amplifier, the second end of the 47th resistor and the second end of the 50th resistor, and the second end of the second temperature-sensitive resistor is grounded; the reverse input end of the fifth operational amplifier is respectively connected to the second end of the 48th resistor and the first end of the 49th resistor, and the output end of the fifth operational amplifier is respectively connected to the cathode of the seventh diode and the cathode of the eighth diode; the first end of the 47th resistor and the first end of the 48th resistor are connected to the third power supply, and the second end of the 49th resistor is grounded; the second end of the 50th resistor is connected to the anode of the seventh diode; The third temperature-sensitive resistor is arranged at the center of the charger, the first end of the third temperature-sensitive resistor is respectively connected to the second end of the fifty-first resistor, the first end of the fifty-fourth resistor and the positive input end of the sixth operational amplifier, and the second end of the third temperature-sensitive resistor is grounded; the reverse input end of the sixth operational amplifier is respectively connected to the second end of the fifty-second resistor and the first end of the fifty-third resistor, and the output end of the sixth operational amplifier is respectively connected to the cathode of the ninth diode and the cathode of the tenth diode; the first end of the fifty-first resistor and the first end of the fifty-second resistor are connected to the third power supply, and the second end of the fifty-third resistor is grounded; the second end of the fifty-fourth resistor is connected to the anode of the ninth diode; The anode of the eighth diode is respectively connected to the cathode of the sixth optocoupler and the anode of the tenth diode; the anode of the sixth optocoupler is connected to the second end of the fifty-fifth resistor, the collector of the sixth optocoupler is connected to the compensation end of the control circuit, and the emitter of the sixth optocoupler is grounded; the first end of the fifty-fifth resistor is connected to the second power supply.

10. The charger according to claim 9, characterized in that: The control circuit includes: a fourth voltage stabilizing diode, a fifty-sixth resistor to a fifty-eighth resistor, an eighteenth capacitor, a nineteenth capacitor, an eleventh diode and a control chip; The power supply pins of the control chip are respectively connected to the collector of the second P-type transistor and the first end of the fifty-seventh resistor, the output pin of the control chip is connected to the second end of the fourth resistor, the sampling pin of the control chip is connected to the second end of the thirteenth resistor, and the compensation pins of the control chip are respectively connected to the collector of the sixth optocoupler, the collector of the second optocoupler, the collector of the third optocoupler, the cathode of the fourth zener diode, the first end of the fifty-sixth resistor, the first end of the eighteenth capacitor and the anode of the eleventh diode; the cathode of the eleventh diode is respectively connected to the first end of the nineteenth capacitor, the first end of the fifty-seventh resistor and the second end of the fifty-eighth resistor; the anode of the fourth zener diode, the second end of the fifty-sixth resistor, the second end of the eighteenth capacitor, the second end of the nineteenth capacitor and the second end of the fifty-eighth resistor are grounded.

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