Large-current charging control circuit

Abstract

The utility model discloses a large-current charging control circuit, which relates to the technical field of charging control, and comprises a power supply module used for multi-path power supply; the first charging module is used for voltage sampling and voltage stabilization adjustment and supplying power to the first output module; the current expansion module is used for performing current expansion processing on the first charging module; the second charging module is used for voltage sampling and voltage stabilization regulation, supplying power to the first output module and performing equal-voltage parallel power supply with the first charging module; the over-temperature detection module is used for over-temperature detection and controlling the feedback switching module to perform signal switching work, controlling the current expanding module to stop current expanding work and controlling the first charging module and the second charging module to be connected in parallel when over-temperature occurs; and the feedback switching module is used for controlling the second charging module to work in a voltage stabilizing manner and controlling the second charging module and the first charging module to supply power in an equal-voltage manner. According to the large-current charging control circuit, the power supply efficiency of large-current voltage stabilization can be improved, the influence of over-temperature on the circuit is reduced, and the safety of the circuit is improved.

Description

Technical Field

[0001] This utility model relates to the field of charging control technology, specifically a high-current charging control circuit. Background Technology

[0002] Modern electronic products are becoming increasingly portable and intelligent, which places demands on their power batteries to be lightweight and efficient. In the charging process of electronic products, charging circuits composed of voltage regulators are generally used. In order to improve the charging rate, the charging control circuit in the existing technology uses transistors for current amplification. However, long-term high-current charging control will cause the temperature of the charging circuit to rise, thereby reducing the power supply efficiency and even causing damage to the charging circuit. Therefore, it needs to be improved. Utility Model Content

[0003] This utility model provides a high-current charging control circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A high-current charging control circuit includes: a power supply module, a first charging module, a current amplification module, a second charging module, an over-temperature detection module, a feedback switching module, a first output module, and a second output module.

[0006] The power module is used to receive AC power and to step down, rectify, and multi-output the AC power, outputting first power and second power.

[0007] The first charging module is connected to the power module and is used to sample voltage and output a first feedback signal, regulate the first electrical energy according to the first feedback signal and output a third electrical energy.

[0008] The current amplification module is connected to the power module, the first charging module and the overcurrent detection module. It is used to receive the first electrical energy and amplify the third electrical energy. When it receives the first control signal output by the overtemperature detection module, it stops the current amplification operation.

[0009] The second charging module is connected to the power module, the feedback switching module, the over-temperature detection module and the first output module. It is used to sample the voltage of the second output module and output a second feedback signal, receive the first feedback signal or the second feedback signal transmitted by the feedback switching module and perform voltage regulation on the second electrical energy, output a fourth electrical energy, and transmit the fourth electrical energy to the first output module when it receives the first control signal output by the over-temperature detection module.

[0010] An over-temperature detection module, connected to the power module, is used to receive second electrical energy and perform temperature detection. When the detected temperature signal is greater than the set over-temperature threshold, it outputs a first control signal.

[0011] The feedback switching module is connected to the over-temperature detection module and the first charging module. It is used to receive the second electrical energy and transmit the input second feedback signal to the second charging module. When the first control signal is received, it stops transmitting the second feedback signal and transmits the first feedback signal to the second charging module.

[0012] The first output module is connected to the first charging module and is used to receive third electrical energy or simultaneously receive third electrical energy and fourth electrical energy.

[0013] The second output module, connected to the second charging module, is used to receive the fourth electrical energy.

[0014] As a further embodiment of this utility model: the power module includes a power interface, a first transformer, a first rectifier, a multi-channel power distribution device, a first capacitor, and a fourth capacitor;

[0015] Preferably, the first and second ends of the power interface are respectively connected to the first and second ends of the primary side of the first transformer, the first and second ends of the secondary side of the first transformer are respectively connected to the first and second ends of the first rectifier, the third end of the first rectifier is connected to the input end of the multi-channel power distribution device, the fourth end of the first rectifier is connected to the grounding end of the multi-channel power distribution device, one end of the first capacitor, one end of the fourth capacitor and the grounding end, the first output end of the multi-channel power distribution device is connected to the other end of the first capacitor and the first charging module, and the second output end of the multi-channel power distribution device is connected to the other end of the fourth capacitor and the second charging module.

[0016] As a further embodiment of this utility model: the first charging module includes a first voltage regulator, a fourth resistor, a first resistor, a first potentiometer, and a second capacitor; the first output module includes a first output port;

[0017] Preferably, the third terminal of the first voltage regulator is connected to the first output terminal of the multi-channel power distribution device through the first resistor, the second terminal of the first voltage regulator is connected to the first terminal of the fourth resistor, the current amplification module and the first terminal of the first output port, and the second terminal of the fourth capacitor is connected to one end of the first potentiometer and the first terminal of the first voltage regulator, and is connected to the second terminal of the first output port, the ground terminal, the other end of the first potentiometer and the slider terminal through the second capacitor.

[0018] As a further improvement of this utility model: the current amplification module includes a first switching transistor, a second resistor, a first diode, and a second diode;

[0019] Preferably, the emitter of the first switching transistor is connected to the anode of the first diode and the first output terminal of the multi-channel power distribution device through the second resistor; the cathode of the first diode is connected to the base of the first switching transistor and the cathode of the second diode and the over-temperature detection module; the anode of the second diode is connected to the third terminal of the first voltage regulator; and the collector of the first switching transistor is connected to the second terminal of the first voltage regulator.

[0020] As a further embodiment of this utility model: the second charging module includes a second voltage regulator, a fifth resistor, a second potentiometer, a third capacitor, and a first thyristor; the second output module includes a second output port;

[0021] Preferably, the third terminal of the second voltage regulator is connected to the second output terminal of the multi-channel power distribution device, the first terminal of the second voltage regulator is connected to the feedback switching module, the second terminal of the second voltage regulator is connected to the first terminal of the second output port and the anode of the first thyristor, and is connected to the first terminal of the third capacitor and one terminal of the second potentiometer through the fifth resistor, the other terminal and the slider terminal of the second potentiometer are both connected to the second terminal of the third capacitor, the second terminal of the second output port and the ground terminal, the cathode of the first thyristor is connected to the first terminal of the first output port, and the control terminal of the first thyristor is connected to the over-temperature detection module.

[0022] As a further improvement of this utility model: the feedback switching module includes a first analog switch, a second switching transistor, and a third resistor;

[0023] Preferably, the fourth and ninth terminals of the first analog switch are both connected to the first terminal of the second voltage regulator, the eighth terminal of the first analog switch is connected to the second terminal of the fourth resistor, the third terminal of the first analog switch is connected to the first terminal of the third capacitor, the fifth terminal of the first analog switch is connected to the collector of the second switching transistor and connected to the second output terminal of the multi-channel power distribution device through the third resistor, the emitter of the second switching transistor is grounded, and the base of the second switching transistor is connected to the sixth terminal of the second analog switch and the over-temperature detection module.

[0024] As a further embodiment of this utility model: the over-temperature detection module includes a first thermistor, an eighth resistor, a seventh resistor, a sixth resistor, a first comparator, a ninth resistor, a tenth resistor, and a third diode;

[0025] Preferably, one end of the first thermistor is connected to the second output terminal of the multi-channel power distribution device and is connected to the inverting terminal of the first comparator and one end of the sixth resistor through the seventh resistor. The non-inverting terminal of the first comparator is connected to the other end of the first thermistor and is connected to the other end of the sixth resistor, the ground terminal and the ground terminal of the multi-channel power distribution device through the eighth resistor. The output terminal of the first comparator is connected to the control terminal of the first thyristor and one end of the tenth resistor and is connected to the base of the second switching transistor through the ninth resistor. The other end of the tenth resistor is connected to the anode of the third diode and the cathode of the third diode is connected to the base of the first switching transistor.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: The high-current charging control circuit of this utility model can use the first charging module in conjunction with the current amplification module to perform voltage stabilization and current amplification processing on the power supply module, so as to provide high-current voltage stabilization for the first output module. The second charging module performs voltage stabilization processing and supplies power to the second output module. At the same time, the over-temperature detection module performs over-temperature detection. When the temperature is too high, the current amplification module is controlled to stop the current amplification operation, and the feedback switching module controls the second charging module and the first charging module to perform equal voltage parallel power supply, thereby maintaining the high-current voltage stabilization output of the first output module, improving the power supply efficiency of high-current voltage stabilization and reducing the impact of over-temperature on the circuit, thus improving the safety of the circuit. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic block diagram of a high-current charging control circuit provided for an example of this utility model.

[0029] Figure 2 A circuit diagram of a high-current charging control circuit provided for this utility model embodiment.

[0030] Figure 3 The connection circuit diagram of the over-temperature detection module provided for this utility model embodiment. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In one embodiment, see Figure 1 A high-current charging control circuit includes: a power supply module 1, a first charging module 2, a current amplification module 3, a second charging module 4, an over-temperature detection module 5, a feedback switching module 6, a first output module 7, and a second output module 8.

[0033] Specifically, power module 1 is used to receive AC power and perform step-down, rectification and multi-output processing on the AC power to output first power and second power.

[0034] The first charging module 2 is connected to the power module 1 and is used to sample voltage and output a first feedback signal, regulate the first electrical energy according to the first feedback signal and output a third electrical energy.

[0035] The current amplification module 3 is connected to the power module 1, the first charging module 2 and the overcurrent detection module. It is used to receive the first electrical energy and amplify the third electrical energy. When it receives the first control signal output by the overtemperature detection module 5, it stops the current amplification operation.

[0036] The second charging module 4 is connected to the power module 1, the feedback switching module 6, the over-temperature detection module 5 and the first output module 7. It is used to sample the voltage of the second output module 8 and output a second feedback signal, receive the first feedback signal or the second feedback signal transmitted by the feedback switching module 6 and perform voltage regulation on the second electrical energy, output a fourth electrical energy, and transmit the fourth electrical energy to the first output module 7 when it receives the first control signal output by the over-temperature detection module 5.

[0037] The over-temperature detection module 5 is connected to the power module 1 and is used to receive the second electrical energy and perform temperature detection. When the detected temperature signal is greater than the set over-temperature threshold, it outputs the first control signal.

[0038] Feedback switching module 6 is connected to the over-temperature detection module 5 and the first charging module 2. It is used to receive the second electrical energy and transmit the input second feedback signal to the second charging module 4. When the first control signal is received, it stops transmitting the second feedback signal and transmits the first feedback signal to the second charging module 4.

[0039] The first output module 7 is connected to the first charging module 2 and is used to receive third electrical energy or simultaneously receive third electrical energy and fourth electrical energy.

[0040] The second output module 8 is connected to the second charging module 4 and is used to receive the fourth electrical energy.

[0041] In a specific embodiment, the power module 1 can be a power circuit composed of a power interface, a transformer, a multi-channel power distribution device, and a capacitor, capable of receiving AC power and performing voltage reduction, rectification, multi-channel voltage regulation, and filtering. The first charging module 2 can be a first charging circuit composed of a voltage regulator, resistors, potentiometers, etc., capable of regulating the input power and sampling the output power voltage, adjusting the output power voltage value according to the sampled signal. The current amplification module 3 can be a current amplification circuit composed of diodes, resistors, and transistors, capable of amplifying the current of the first charging circuit. The second charging module 4 can be a second charging circuit composed of a voltage regulator, resistors, capacitors, etc., capable of regulating the input power and sampling the output power voltage, adjusting the output power voltage value according to the sampled signal, controlled by the over-temperature detection module 5 and connected to the first charging module. The electrical module 2 provides equal-voltage parallel power supply, and the output current of the parallel power supply must be equal to the current of the third electrical energy after current amplification. The over-temperature detection module 5 can be an over-temperature detection circuit composed of thermistors, resistors, comparators, etc., which can detect over-temperature and compare the detected temperature signal with the voltage of the set over-temperature threshold. The feedback switching module 6 can be a feedback switching circuit composed of analog switches, resistors, and transistors, which can transmit the second feedback signal detected by the second charging module 4 to the second charging module 4 and the first feedback signal detected by the first charging module 2 to the second charging module 4. The first output module 7 can be a first output circuit composed of first output ports, which can receive electrical energy and power connected electronic devices. The second output module 8 can be a second output circuit composed of second output ports, which can receive electrical energy and power connected electronic devices.

[0042] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power interface, a first transformer B1, a first rectifier T1, a multi-channel power distribution device, a first capacitor C1, and a fourth capacitor C4.

[0043] Specifically, the first and second ends of the power interface are respectively connected to the first and second ends of the primary side of the first transformer B1, the first and second ends of the secondary side of the first transformer B1 are respectively connected to the first and second ends of the first rectifier T1, the third end of the first rectifier T1 is connected to the input end of the multi-channel power distribution device, the fourth end of the first rectifier T1 is connected to the grounding end of the multi-channel power distribution device, one end of the first capacitor C1, one end of the fourth capacitor C4 and the grounding end, the first output end of the multi-channel power distribution device is connected to the other end of the first capacitor C1 and the first charging module 2, and the second output end of the multi-channel power distribution device is connected to the other end of the fourth capacitor C4 and the second charging module 4.

[0044] In a specific embodiment, the aforementioned multi-channel power distribution device may be composed of a flyback multi-channel switching power supply.

[0045] Furthermore, the first charging module 2 includes a first voltage regulator IC1, a fourth resistor R4, a first resistor R1, a first potentiometer RP1, and a second capacitor C2; the first output module 7 includes a first output port.

[0046] Specifically, the third terminal of the first voltage regulator IC1 is connected to the first output terminal of the multi-channel power distribution device through the first resistor R1. The second terminal of the first voltage regulator IC1 is connected to the first terminal of the fourth resistor R4, the current amplification module 3 and the first terminal of the first output port. The second terminal of the fourth capacitor C4 is connected to one end of the first potentiometer RP1 and the first terminal of the first voltage regulator IC1, and is connected to the second terminal of the first output port, the ground terminal, the other end of the first potentiometer RP1 and the slider terminal through the second capacitor C2.

[0047] In a specific embodiment, the first voltage regulator IC1 can be an LM317 voltage regulator; the fourth resistor R4 and the first potentiometer RP1 sample the voltage of the third electrical energy output from the second terminal of the first voltage regulator IC1 and provide a first feedback signal.

[0048] Furthermore, the current amplification module 3 includes a first switching transistor V1, a second resistor R2, a first diode D1, and a second diode D2;

[0049] Specifically, the emitter of the first switching transistor V1 is connected to the anode of the first diode D1 and the first output terminal of the multi-channel power distribution device through the second resistor R2. The cathode of the first diode D1 is connected to the base of the first switching transistor V1, the cathode of the second diode D2 and the over-temperature detection module 5. The anode of the second diode D2 is connected to the third terminal of the first voltage regulator IC1. The collector of the first switching transistor V1 is connected to the second terminal of the first voltage regulator IC1.

[0050] In a specific embodiment, the first switching transistor V1 can be a PNP transistor; the first resistor R1 is a bleed resistor to prevent the operating current of the internal circuit of the first voltage regulator IC1 from flowing through the base of the first switching transistor V1; the first diode D1 and the second resistor R2 provide overcurrent protection.

[0051] Furthermore, the second charging module 4 includes a second voltage regulator IC2, a fifth resistor R5, a second potentiometer RP2, a third capacitor C3, and a first thyristor S1; the second output module 8 includes a second output port;

[0052] Specifically, the third terminal of the second voltage regulator IC2 is connected to the second output terminal of the multi-channel power distribution device, the first terminal of the second voltage regulator IC2 is connected to the feedback switching module 6, the second terminal of the second voltage regulator IC2 is connected to the first terminal of the second output port and the anode of the first thyristor S1, and is connected to the first terminal of the third capacitor C3 and one terminal of the second potentiometer RP2 through the fifth resistor R5. The other terminal and the slider terminal of the second potentiometer RP2 are both connected to the second terminal of the third capacitor C3, the second terminal of the second output port and the ground terminal. The cathode of the first thyristor S1 is connected to the first terminal of the first output port, and the control terminal of the first thyristor S1 is connected to the over-temperature detection module 5.

[0053] In a specific embodiment, the second voltage regulator IC2 can be an LM317 voltage regulator; the fifth resistor R5 and the second potentiometer RP2 provide a second feedback signal; and the first thyristor S1 can be a unidirectional thyristor.

[0054] Furthermore, the feedback switching module 6 includes a first analog switch IC3, a second switching transistor V2, and a third resistor R3;

[0055] Specifically, the fourth and ninth terminals of the first analog switch IC3 are both connected to the first terminal of the second voltage regulator IC2, the eighth terminal of the first analog switch IC3 is connected to the second terminal of the fourth resistor R4, the third terminal of the first analog switch IC3 is connected to the first terminal of the third capacitor C3, the fifth terminal of the first analog switch IC3 is connected to the collector of the second switching transistor V2 and connected to the second output terminal of the multi-channel power distribution device through the third resistor R3, the emitter of the second switching transistor V2 is grounded, and the base of the second switching transistor V2 is connected to the sixth terminal of the second analog switch and the over-temperature detection module 5.

[0056] In a specific embodiment, the first analog switch IC3 can be a CD4066 chip; the second switch V2 can be an NPN transistor.

[0057] Furthermore, the over-temperature detection module 5 includes a first thermistor RT1, an eighth resistor R8, a seventh resistor R7, a sixth resistor R6, a first comparator A1, a ninth resistor R9, a tenth resistor R10, and a third diode D3;

[0058] Specifically, one end of the first thermistor RT1 is connected to the second output terminal of the multi-channel power distribution device and is connected to the inverting terminal of the first comparator A1 and one end of the sixth resistor R6 through the seventh resistor R7. The non-inverting terminal of the first comparator A1 is connected to the other end of the first thermistor RT1 and is connected to the other end of the sixth resistor R6, the ground terminal and the ground terminal of the multi-channel power distribution device through the eighth resistor R8. The output terminal of the first comparator A1 is connected to the control terminal of the first thyristor S1 and one end of the tenth resistor R10 and is connected to the base of the second switching transistor V2 through the ninth resistor R9. The other end of the tenth resistor R10 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the base of the first switching transistor V1.

[0059] In a specific embodiment, the first thermistor RT1 can be a negative temperature coefficient thermistor; the seventh resistor R7 and the sixth resistor R6 are set with over-temperature thresholds; and the first comparator A1 can be an LM358 comparator.

[0060] In this embodiment of a high-current charging control circuit, AC power is connected through a power interface. A first transformer B1 and a first rectifier T1 perform voltage reduction and rectification. A multi-channel power distribution device performs multi-channel voltage regulation and outputs first electrical energy from its first output terminal and second electrical energy from its second output terminal. A first capacitor C1 and a fourth capacitor C4 perform filtering. A first voltage regulator IC1, in conjunction with a fourth resistor R4, a second capacitor C2, and a first potentiometer RP1, regulates the first electrical energy and outputs third electrical energy. The fourth resistor R4, the second capacitor C2, and the first potentiometer RP1 provide a first feedback signal. A first switch V1, in conjunction with a second resistor R2, a first resistor R1, a first diode D1, and a second diode D2, amplifies the current of the third electrical energy. Adjusting the first potentiometer RP1 adjusts the voltage of the third electrical energy. Simultaneously, a first analog switch IC3... The fourth and third terminals of the first analog switch IC3 are turned on, so that the second voltage regulator IC2, together with the fifth resistor R5, the second potentiometer RP2 and the third capacitor C3, performs voltage regulation on the second electrical energy and outputs the fourth electrical energy. The first thermistor RT1 and the eighth resistor R8 perform temperature detection. When the detected temperature signal is greater than the over-temperature threshold set by the seventh resistor R7 and the sixth resistor R6, the first comparator A1 outputs the first control signal and controls the second switch V2 and the first thyristor S1 to turn on, controls the first switch V1 to turn off, and the ninth and eighth terminals of the first analog switch IC3 are turned on, so that the voltage of the fourth electrical energy output by the second voltage regulator IC2 is equal to the voltage of the third electrical energy output by the first voltage regulator IC1. The third electrical energy and the fourth electrical energy are connected in parallel and supply power to the first output port to maintain high current charging control. At this time, the second output port needs to be disconnected from the electronic equipment.

[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large current charging control circuit, characterized in that, the large current charging control circuit comprises a power module, a first charging module, a current expansion module, a second charging module, an over-temperature detection module, a feedback switching module, a first output module and a second output module; the power module is configured to access alternating current energy and perform voltage reduction, rectification and multi-output processing on the alternating current energy, and output first energy and second energy; the first charging module is connected with the power module and configured to perform voltage sampling and output a first feedback signal, perform voltage regulation processing on the first energy according to the first feedback signal, and output third energy; the current expansion module is connected with the power module, the first charging module and the over-temperature detection module, configured to receive the first energy and perform current expansion processing on the third energy, and stop the current expansion processing when receiving a first control signal output by the over-temperature detection module; the second charging module is connected with the power module, the feedback switching module, the over-temperature detection module and the first output module, configured to perform voltage sampling on the second output module and output a second feedback signal, receive the first feedback signal or the second feedback signal transmitted by the feedback switching module and perform voltage regulation processing on the second energy, output fourth energy, and transmit the fourth energy to the first output module when receiving the first control signal output by the over-temperature detection module; the over-temperature detection module is connected with the power module and configured to receive the second energy and perform temperature detection, and output the first control signal when a detected temperature signal is greater than a set over-temperature threshold value; the feedback switching module is connected with the over-temperature detection module and the first charging module, configured to receive the second energy and transmit the input second feedback signal to the second charging module, and stop transmitting the second feedback signal and transmit the first feedback signal to the second charging module when receiving the first control signal; the first output module is connected with the first charging module and configured to receive the third energy or simultaneously receive the third energy and the fourth energy; the second output module is connected with the second charging module and configured to receive the fourth energy.

2. A large current charging control circuit according to claim 1, wherein The power module comprises a power interface, a first transformer, a first rectifier, a multi-output power distribution device, a first capacitor and a fourth capacitor; the first end and the second end of the power interface are connected with the first end and the second end of the primary side of the first transformer, the first end and the second end of the secondary side of the first transformer are connected with the first end and the second end of the first rectifier, the third end of the first rectifier is connected with the input end of the multi-output power distribution device, the fourth end of the first rectifier is connected with the ground end of the multi-output power distribution device, one end of the first capacitor, one end of the fourth capacitor and the ground end, the first output end of the multi-output power distribution device is connected with the other end of the first capacitor and the first charging module, and the second output end of the multi-output power distribution device is connected with the other end of the fourth capacitor and the second charging module.

3. A large current charging control circuit according to claim 2, wherein The first charging module comprises a first voltage regulator, a fourth resistor, a first resistor, a first potentiometer and a second capacitor, and the first output module comprises a first output port. The third end of the first voltage stabilizer is connected with the first output end of the multi-way power distribution device through a first resistor, the second end of the first voltage stabilizer is connected with the first end of a fourth resistor, a current expansion module and the first end of a first output port, and the second end of a fourth capacitor is connected with one end of a first potentiometer and the first end of the first voltage stabilizer and is connected with the second end of the first output port, a ground end, the other end of the first potentiometer and a wiper end through a second capacitor.

4. A large current charging control circuit according to claim 3, wherein The current expansion module comprises a first switching tube, a second resistor, a first diode and a second diode. The emitter of the first switching tube is connected with the anode of the first diode and the first output end of the multi-way power distribution device through a second resistor, the cathode of the first diode is connected with the base of the first switching tube and the cathode of the second diode and an over-temperature detection module, the anode of the second diode is connected with the third end of the first voltage stabilizer, and the collector of the first switching tube is connected with the second end of the first voltage stabilizer.

5. A large current charging control circuit according to claim 4, wherein The second charging module comprises a second voltage stabilizer, a fifth resistor, a second potentiometer, a third capacitor and a first thyristor, and the second output module comprises a second output port. The third end of the second voltage stabilizer is connected with the second output end of the multi-way power distribution device, the first end of the second voltage stabilizer is connected with a feedback switching module, the second end of the second voltage stabilizer is connected with the first end of the second output port and the anode of the first thyristor and is connected with the first end of the third capacitor and one end of the second potentiometer through the fifth resistor, the other end of the second potentiometer and the wiper end are both connected with the second end of the third capacitor, the second end of the second output port and the ground end, the cathode of the first thyristor is connected with the first end of the first output port, and the control end of the first thyristor is connected with the over-temperature detection module.

6. A large current charge control circuit according to claim 5, wherein The feedback switching module comprises a first analog switch, a second switching tube and a third resistor. The fourth end and the ninth end of the first analog switch are both connected with the first end of the second voltage stabilizer, the eighth end of the first analog switch is connected with the second end of the fourth resistor, the third end of the first analog switch is connected with the first end of the third capacitor, the fifth end of the first analog switch is connected with the collector of the second switching tube and is connected with the second output end of the multi-way power distribution device through the third resistor, the emitter of the second switching tube is grounded, and the base of the second switching tube is connected with the sixth end of the second analog switch and the over-temperature detection module.

7. A large current charge control circuit according to claim 6, wherein The over-temperature detection module comprises a first thermistor, an eighth resistor, a seventh resistor, a sixth resistor, a first comparator, a ninth resistor, a tenth resistor and a third diode. One end of the first thermistor is connected with the second output end of the multi-way power distribution device and is connected with the inverting end of the first comparator and one end of the sixth resistor through the seventh resistor, the non-inverting end of the first comparator is connected with the other end of the first thermistor and is connected with the other end of the sixth resistor, the ground end of the multi-way power distribution device and the ground end through the eighth resistor, the output end of the first comparator is connected with the control end of the first thyristor and one end of the tenth resistor and is connected with the base of the second switching tube through the ninth resistor, the other end of the tenth resistor is connected with the anode of the third diode, and the cathode of the third diode is connected with the base of the first switching tube.

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