A fast charging circuit and charging method

Abstract

The present invention provides an ultra-fast charging circuit and charging method, comprising a power supply for providing electrical energy; an input module for converting the power supply's electrical energy into an energy signal suitable for storage in a winding boost energy storage module; the winding boost energy storage module for accumulating and storing the converted electrical energy, and rapidly charging a battery to be charged after the stored energy reaches a certain level; an output module for controlling the on / off state of the circuit between the winding boost energy storage module and the battery to be charged; a detection circuit for detecting the voltage across the winding boost energy storage module and the battery to be charged, and detecting the current at the shutdown functions of the input and output modules; and a control unit for controlling the on / off state of the input and output modules, as well as the charging and discharging rates, based on the voltage and current signals detected by the detection circuit. The present invention fully utilizes the battery's charge acceptance capacity, improves or shortens charging time, and enables the battery to achieve ultra-fast charging capabilities.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging, and in particular to an extremely fast charging circuit and a charging method. Background Art

[0002] With the development of communications and new energy vehicles, portable batteries are increasingly being used to provide energy, such as in mobile phones and electric vehicles. However, due to the currently used method, the battery is constantly heating up during the charging process, which increases the battery's internal resistance. This wastes the battery's charge acceptance capacity and causes the battery to remain in a charging state for a long time, causing numerous inconveniences for the user. In the use of mobile phones, many people, in order to solve the problem of not being able to replenish power in time, use charging to expand capacity to maintain daily use. In vehicles, they use battery replacement to solve the inconvenience of waiting for charging. Long charging times have always been a bottleneck in the development of new energy vehicles and a concern for mobile phone users. Extremely fast charging is imminent. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides an extremely fast charging circuit and a charging method.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an extremely fast charging circuit, including a power supply, a control unit, an input module, a winding boost energy storage module, an output module, a detection circuit and a battery to be charged, wherein the input module has a shutdown and rectification function, the winding boost energy storage module has a boost and energy accumulation function, and the output module has a shutdown function;

[0005] The power supply is used to provide electrical energy;

[0006] The input module is used to convert the electrical energy of the power supply into an energy signal suitable for storage in the winding boost energy storage module;

[0007] The winding boost energy storage module is used to accumulate and store the converted electrical energy. When the stored energy reaches a certain amount, the battery to be charged is quickly charged.

[0008] The output module is used to control the on / off of the circuit between the winding boost energy storage module and the battery to be charged;

[0009] The detection circuit is used to detect the voltage on the winding boost energy storage module and the battery to be charged, as well as the current on the shutdown function in the input module and the output module;

[0010] The control unit is used to control the on / off of the input module and the output module as well as the charging and discharging rates according to the voltage signal and current signal detected by the detection circuit.

[0011] There are many ways to implement the charging circuit. Here are two implementation options:

[0012] Solution 1: The control unit adopts a single-chip microcomputer, the input module includes an EMC module U1, a rectifier module U2, a transistor IGBT1, a first drive signal U3 and a filter capacitor C1; the winding boost energy storage module includes a winding L1 and a filter capacitor C2; the output module includes a transistor IGBT2, a second drive signal U4 winding and a voltage regulator diode D1; the detection circuit includes current sensors DL1 and DL2, and a battery BAT1; wherein, the input end of the EMC module U1 is connected to an external AC220V power supply, and the EM The output end of the C module U1 is connected to the rectifier module U2 for rectified output; the capacitor C1 is connected in parallel between the positive and negative output ends of the rectifier module U2, and the capacitor C1 and the positive output end of the rectifier module U2 lead to the voltage signal end DY1; the base of the transistor IGBT1 is connected to the first drive signal U3, the collector is connected to the positive output end of the rectifier module U2, the emitter is connected in series with the winding L1 and then connected to the collector of the transistor IGBT2, and the common end of the winding L1 and the transistor IGBT2 leads to the voltage signal end DY2; the emitter of the transistor IGBT2 is connected to the battery B The positive electrode of AT1 and the common terminal lead to the voltage signal terminal DY3, and the base of the transistor IGBT2 is connected to the second drive signal U4; the negative output terminal of the rectifier module U2 is connected in series with the current sensors DL1 and DL2 and then connected to the negative electrode of the battery BAT1, and the current sensor DL1 is located on the line between the capacitor C1 and the diode D1, and the current sensor DL2 is located on the line between the capacitor C2 and the battery BAT1; the cathode of the diode D1 is connected to the emitter of the transistor IGBT2, and the anode is connected to one end of the current sensor DL1; one end of the capacitor C2 is connected to the It is connected to the common end of the winding L1 and the transistor IGBT2, and the other end is connected to one end of the current sensor DL2; the three voltage signals DY1, DY2 and DY3 and the current sensors DL1 and DL2 measure two current signals I1 and I2, which are input into the microcontroller. The microcontroller controls the on and off of the transistors IGBT1 and IGBT2 according to the voltage signals DY1 and DY2, adjusts the duty cycle of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2, and determines whether the battery BAT1 is fully charged according to the size of the voltage signal DY3.

[0013] Solution 2: The control unit adopts a single-chip microcomputer, and the input module includes an EMC module U1, a rectifier module U2, a transistor IGBT1, a first drive signal U3 and a filter capacitor C1; the winding boost energy storage module includes a winding L1; the output module includes a transistor IGBT2 and a second drive signal U4; the detection circuit includes current sensors DL1 and DL2, and a battery BAT1; wherein, the input end of the EMC module U1 is connected to an external AC220V power supply, and the output end of the EMC module U1 is connected to the rectifier module U2 for rectified output; the capacitor C1 is connected in parallel between the positive and negative output ends of the rectifier module U2, and the capacitor C1 and the positive output end of the rectifier module U2 lead to the test signal end DY1; the base of the transistor IGBT1 is connected to the first drive signal U3, the collector is connected to the positive output end of the rectifier module U2, the emitter is connected to the emitter of the transistor IGBT2, the collector of the transistor IGBT2 is connected to the negative electrode of the battery BAT1, and the collector of the transistor IGBT2 is connected to the negative electrode of the battery BAT1. The second drive signal U4 is connected; the negative output end of the rectifier module U2 is connected in series with the current sensors DL1 and DL2 and then connected to the positive electrode of the battery BAT1, and the current sensor DL1 is located on the line between the capacitor C1 and the winding L1, and the current sensor DL2 is located on the line between the winding L1 and the battery BAT1; one end of the winding L1 is connected to the common end of the transistors IGBT1 and IGBT2, and the other end is connected to the common end of the current sensors DL1 and DL2; a voltage signal terminal DY2 is drawn between the current sensor DL2 and the positive electrode of the battery BAT1; the two voltage signals DY1 and DY2 and the current sensors DL1 and DL2 measure two current signals I1 and I2, which are input to the microcontroller. The microcontroller controls the on and off of the transistors IGBT1 and IGBT2 according to the voltage signal DY1, and adjusts the duty cycle of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2, thereby adjusting the charging rate; and it is determined whether the battery BAT1 is fully charged according to the magnitude of the voltage signal DY2.

[0014] Furthermore, in order to achieve independent power supply for each module, an auxiliary power supply module POWER is also included. The output end of the EMC module U1 is connected to the auxiliary power supply module POWER to output four voltage signals V1, V2, V3 and V4, wherein the voltage signal V1 is 3.3V, which is used to provide power to the STM32F series microcontroller; the voltage signal V2 provides driving power to the two transistor IGBTs; the voltage signal V3 is used to provide power for the current sensor in the detection circuit; the voltage signal V4 is used to provide power to the fan.

[0015] Furthermore, the device also includes an electronically controlled switch located on the main power input circuit, which is connected to the microcontroller signal. In the event of an emergency or abnormal situation, the microcontroller controls the electronically controlled switch to cut off the main power input at the input terminal, ensuring the safety of the entire charging circuit.

[0016] A rapid charging method, in which the energy stored in the winding boost energy storage module is zero in the initial state. At this time, the charging mode is turned on, and the external power supply charges the winding boost energy storage module through the input module. At this time, transistor IGBT1 is closed, transistor IGBT2 is disconnected, and electrical energy is stored in the winding boost energy storage module. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, transistor IGBT1 is disconnected, transistor IGBT2 is closed, and the winding boost energy storage module begins to discharge, charging the battery, and the energy stored in the winding boost energy storage module decreases.

[0017] When the electric energy stored in the winding boost energy storage module drops to the preset charging voltage value Vs, the transistor IGBT1 is closed, and at the same time, the transistor IGBT2 remains in the closed state. The external power supply stores energy in the winding boost energy storage module, and at the same time, the winding boost energy storage module discharges to charge the battery.

[0018] When the electric energy stored in the winding boost energy storage module drops to the minimum energy storage value Vmin, transistor IGBT1 is continuously closed to charge the winding boost energy storage module. At the same time, transistor IGBT2 is disconnected to stop charging the battery. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, transistor IGBT2 is closed again to charge the battery. The above cycle continues until the battery is fully charged.

[0019] During the charging process, the single chip microcomputer controls the on and off of transistors IGBT1 and IGBT2 according to the voltage on the winding boost energy storage module, and adjusts the duty ratio of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2.

[0020] The beneficial effects of the present invention are as follows: the ultra-fast charging circuit and charging method provided by the present invention are widely applicable to various types of batteries with different properties and performances due to the uniqueness of the method and the creativity of the circuit. Depending on the different battery specifications and application areas, the charging speed can be controlled to be between 5 minutes and 20 minutes. For example, electric vehicles, small electric four-wheeled sightseeing vehicles, and police patrol vehicles can be fully charged in about 20 minutes, light electric motorcycles and electric bicycles in about 15 minutes, and mobile phones in about 5-10 minutes. The invention is also applicable to various mobile electrical devices that use portable batteries as energy sources, making it very convenient for charging vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 Schematic diagram of the structure of the best embodiment of the present invention.

[0023] Figure 2 1 is a circuit diagram of embodiment 1.

[0024] Figure 3 It is a circuit diagram of embodiment 2. DETAILED DESCRIPTION

[0025] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0026] like Figure 1 As shown, a fast charging circuit of the present invention includes a power supply, a control unit, an input module, a winding boost energy storage module, an output module, a detection circuit and a battery to be charged, wherein the input module has a shutdown and rectification function, the winding boost energy storage module has a boost and energy accumulation function, and the output module has a shutdown function; the power supply is used to provide electrical energy; the input module is used to convert the electrical energy of the power supply into an energy signal suitable for storage in the winding boost energy storage module; the winding boost energy storage module is used to accumulate and store the converted electrical energy, and after the stored energy reaches a certain amount, the battery to be charged is quickly charged; the output module is used to control the on-off control of the line between the winding boost energy storage module and the battery to be charged; the detection circuit is used to detect the voltage on the winding boost energy storage module and the battery to be charged, and detect the current on the shutdown function in the input module and the output module; the control unit is used to control the on-off and charging and discharging rates of the input module and the output module according to the voltage signal and current signal detected by the detection circuit.

[0027] Two specific implementation methods are given below:

[0028] Example 1: The control unit adopts a single-chip microcomputer, the input module includes an EMC module U1, a rectifier module U2, a transistor IGBT1, a first drive signal U3 and a filter capacitor C1; the output module includes a transistor IGBT2, a second drive signal U4 and a voltage regulator diode D1; the winding boost energy storage module includes a winding L1 and a filter capacitor C2; the detection circuit includes current sensors DL1 and DL2, and a battery BAT1; wherein the input end of the EMC module U1 is connected to an external AC220V power supply, and the EMC The output end of module U1 is connected to the rectifier module U2 for rectified output; capacitor C1 is connected in parallel between the positive and negative output ends of the rectifier module U2, and capacitor C1 and the positive output end of the rectifier module U2 lead to the voltage signal end DY1; the base of transistor IGBT1 is connected to the first drive signal U3, the collector is connected to the positive output end of the rectifier module U2, the emitter is connected in series with the winding L1 and then connected to the collector of transistor IGBT2, and the common end of the winding L1 and the transistor IGBT2 leads to the voltage signal end DY2; the emitter of transistor IGBT2 is connected to the battery BA The positive electrode of T1 and the common terminal lead to the voltage signal terminal DY3, and the base of the transistor IGBT2 is connected to the second drive signal U4; the negative output terminal of the rectifier module U2 is connected in series with the current sensors DL1 and DL2 and then connected to the negative electrode of the battery BAT1, and the current sensor DL1 is located on the line between the capacitor C1 and the diode D1, and the current sensor DL2 is located on the line between the capacitor C2 and the battery BAT1; the cathode of the diode D1 is connected to the emitter of the transistor IGBT2, and the anode is connected to one end of the current sensor DL1; one end of the capacitor C2 is connected to the It is connected to the common end of the winding L1 and the transistor IGBT2, and the other end is connected to one end of the current sensor DL2; the three voltage signals DY1, DY2 and DY3 and the current sensors DL1 and DL2 measure two current signals I1 and I2, which are input into the microcontroller. The microcontroller controls the on and off of the transistors IGBT1 and IGBT2 according to the voltage signals DY1 and DY2, adjusts the duty cycle of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2, and determines whether the battery BAT1 is fully charged according to the size of the voltage signal DY3.

[0029] Furthermore, in order to achieve independent power supply for each module, an auxiliary power supply module POWER is also included. The output end of the EMC module U1 is connected to the auxiliary power supply module POWER to output four voltage signals V1, V2, V3 and V4, wherein the voltage signal V1 is 3.3V, which is used to provide power to the STM32F series microcontroller; the voltage signal V2 provides driving power to the two transistor IGBTs; the voltage signal V3 is used to provide power for the current sensor in the detection circuit; the voltage signal V4 is used to provide power to the fan.

[0030] Furthermore, the device also includes an electronically controlled switch located on the main power input circuit, which is connected to the microcontroller signal. In the event of an emergency or abnormal situation, the microcontroller controls the electronically controlled switch to cut off the main power input at the input terminal, ensuring the safety of the entire charging circuit.

[0031] Example 2: The difference between this example and Example 1 is that the circuit connection of the winding boost energy storage module is different. In this example, the winding boost energy storage module includes a winding L1; and there is no filter capacitor C2 and a voltage regulator diode D1 in the circuit. The input end of the EMC module U1 is connected to an external AC220V power supply, and the output end of the EMC module U1 is connected to the rectifier module U2 for rectified output; the capacitor C1 is connected in parallel between the positive and negative output ends of the rectifier module U2, and the capacitor C1 and the positive output end of the rectifier module U2 lead to a test signal end DY1; the base of the transistor IGBT1 is connected to the first drive signal U3, the collector is connected to the positive output end of the rectifier module U2, the emitter is connected to the emitter of the transistor IGBT2, the collector of the transistor IGBT2 is connected to the negative electrode of the battery BAT1, and the transistor IGBT2 is connected to the second drive signal U4; the negative output end of the rectifier module U2 is connected in series with the current sensors DL1 and DL2 in sequence and then connected to the positive electrode of the battery BAT1, and the current sensor DL1 is located between the capacitor C1 and the winding L 1, the current sensor DL2 is located on the line between the winding L1 and the battery BAT1; one end of the winding L1 is connected to the common end of the transistors IGBT1 and IGBT2, and the other end is connected to the common end of the current sensors DL1 and DL2; a voltage signal terminal DY2 is drawn between the current sensor DL2 and the positive electrode of the battery BAT1; the two voltage signals DY1 and DY2 and the current sensors DL1 and DL2 measure two current signals I1 and I2, which are input to the microcontroller, and the microcontroller controls the on and off of the transistors IGBT1 and IGBT2 according to the voltage signal DY1, and adjusts the duty cycle of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2, thereby adjusting the charging rate; and whether the battery BAT1 is fully charged is determined according to the magnitude of the voltage signal DY2.

[0032] In the above circuit, the EMC module U1 uses a common power supply electromagnetic compatibility module; the rectifier module U2 uses a diode rectifier module. The first drive signal U3 and the second drive signal U4 are provided by a single-chip microcomputer, and the duty cycle of their outputs is preset by the microcontroller based on the customer's charging rate. The specifications of the current sensors DL1 and DL2 can be selected according to customer needs. The preferred specifications for current sensor DL1 are 200A-3V, and those for current sensor DL2 are 500A-3V. Winding L1 can be a single coil or multiple coils connected in parallel. The number of turns can be set according to the specific situation, and the voltage boost function is achieved by controlling the number of turns. The microcontroller reads the current sensor's current signal, reads the voltage signal on the line, outputs the transistor drive signal, and adjusts the signal's duty cycle, all using conventional techniques. Transistors are used for switching control, and the charging rate is adjusted by adjusting the drive signal's duty cycle, achieving fast charging.

[0033] In order to fully utilize the charging acceptance capacity of the battery, improve and shorten the charging time, and enable the battery to achieve the ability of extremely fast charging, the method adopted is: (1) the input module inputs electrical energy into the winding module, and the winding module has the function of boosting and accumulating energy; (2) after the winding module reaches the designed accumulation energy, the input module is disconnected; (3) the output module is turned on, and the energy accumulated in the winding module is released to the battery to be charged in the form of a surge; (4) the electrical energy in the winding module is released to the set value, such as 50%, and the input module is turned on for replenishment; (5) when the energy in the winding module reaches the set minimum value, the output module is turned off; (6) after the output module is turned off, the input module continues to input electrical energy to the winding module; (7) when the energy accumulation of the winding reaches the set value, the input module is turned off again, and the output module is turned on again.

[0034] The specific charging process is as follows: an extremely fast charging method. In the initial state, the energy stored in the winding boost energy storage module is 0. At this time, the charging mode is turned on, and the external power supply charges the winding boost energy storage module through the input module. At this time, the transistor IGBT1 is closed and the transistor IGBT2 is disconnected, and the electrical energy is stored in the winding boost energy storage module. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, the transistor IGBT1 is disconnected and the transistor IGBT2 is closed. The winding boost energy storage module starts to discharge and charge the battery, and the energy stored in the winding boost energy storage module decreases.

[0035] When the electric energy stored in the winding boost energy storage module drops to the preset charging voltage value Vs, transistor IGBT1 is closed. At the same time, transistor IGBT2 remains in the closed state. The external power supply stores energy in the winding boost energy storage module. At the same time, the winding boost energy storage module discharges to charge the battery. The minimum energy storage value Vmin and the preset charging voltage value Vs are set according to customer needs. For example, they can be set to min = 10% Vmax; Vs = 50% Vmax.

[0036] When the electric energy stored in the winding boost energy storage module drops to the minimum energy storage value Vmin, transistor IGBT1 is continuously closed to charge the winding boost energy storage module. At the same time, transistor IGBT2 is disconnected to stop charging the battery. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, transistor IGBT2 is closed again to charge the battery. The above cycle continues until the battery is fully charged.

[0037] During charging, the microcontroller controls the on / off switching of transistors IGBT1 and IGBT2 based on the voltage on the winding boost energy storage module and adjusts the duty cycle of the first drive signal U3 and the second drive signal U4 based on current signals I1 and I2. The voltage on the winding boost energy storage module is calculated using voltage signals DY1 and DY2, or voltage signal DY1.

[0038] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel may make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A fast charging circuit, characterized in that: It includes a power supply, a control unit, an input module, a winding boost energy storage module, an output module, a detection circuit and a battery to be charged. The input module has a shutdown and rectification function, the winding boost energy storage module has a boost and energy accumulation function, and the output module has a shutdown function. The power supply is used to provide electrical energy; The input module is used to convert the electrical energy of the power supply into an energy signal suitable for storage in the winding boost energy storage module; The winding boost energy storage module is used to accumulate and store the converted electrical energy. When the stored energy reaches a certain amount, Quickly charge the battery to be charged; The output module is used to control the on / off of the circuit between the winding boost energy storage module and the battery to be charged; The detection circuit is used to detect the voltage on the winding boost energy storage module and the battery to be charged, as well as the current on the shutdown function in the input module and the output module; The control unit is used to control the on / off of the input module and the output module as well as the charging and discharging rates according to the voltage signal and current signal detected by the detection circuit; The control unit adopts a single-chip microcomputer, the input module includes an EMC module U1, a rectifier module U2, a transistor IGBT1, a first drive signal U3 and a filter capacitor C1; the winding boost energy storage module includes a winding L1 and a filter capacitor C2; the output module includes a transistor IGBT2, a second drive signal U4 and a voltage regulator diode D1; the detection circuit includes current sensors DL1 and DL2, and a battery BAT1, wherein, The input end of the EMC module U1 is connected to an external AC220V power supply, and the output end of the EMC module U1 is connected to the rectifier module U2 for rectified output; the capacitor C1 is connected in parallel between the positive and negative output ends of the rectifier module U2, and the capacitor C1 and the positive output end of the rectifier module U2 lead to a voltage signal end DY1; the base of the transistor IGBT1 is connected to the first drive signal U3, the collector is connected to the positive output end of the rectifier module U2, the emitter is connected in series with the winding L1 and then connected to the collector of the transistor IGBT2, and the common end of the winding L1 and the transistor IGBT2 leads to a voltage signal end DY2; the emitter of the transistor IGBT2 is connected to the positive electrode of the battery BAT1, the common end leads to a voltage signal end DY3, and the base of the transistor IGBT2 is connected to the second drive signal U4; the negative output end of the rectifier module U2 is connected in series with the current sensors DL1 and DL2 in sequence and then connected to the battery BAT 1, and the current sensor DL1 is located in the circuit between the capacitor C1 and the diode D1, and the current sensor DL2 is located in the circuit between the capacitor C2 and the battery BAT1; the cathode of the diode D1 is connected to the emitter of the transistor IGBT2, and the anode is connected to one end of the current sensor DL1; one end of the capacitor C2 is connected to the common end of the winding L1 and the transistor IGBT2, and the other end is connected to one end of the current sensor DL2; the three voltage signals DY1, DY2 and DY3 and the current sensors DL1 and DL2 measure two current signals I1 and I2, which are input to the single-chip microcomputer, and the single-chip microcomputer controls the on and off of the transistors IGBT1 and IGBT2 according to the voltage signals DY1 and DY2, adjusts the duty ratio of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2, and determines whether the battery BAT1 is fully charged according to the magnitude of the voltage signal DY3; The method of using an extremely fast charging circuit includes: Step 11: In the initial state, the energy stored in the winding boost energy storage module is 0. At this time, the charging mode is turned on. Step 12: The external power supply charges the winding boost energy storage module through the input module. At this time, transistor IGBT1 is closed, transistor IGBT2 is disconnected, and electrical energy is stored in the winding boost energy storage module. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, transistor IGBT1 is disconnected, transistor IGBT2 is closed, and the winding boost energy storage module begins to discharge, charging the battery, and the energy stored in the winding boost energy storage module decreases. Step 13: When the electric energy stored in the winding boost energy storage module drops to a preset charging voltage value Vs, transistor IGBT1 is closed, and transistor IGBT2 remains closed. The external power supply stores energy in the winding boost energy storage module, and at the same time, the winding boost energy storage module discharges to charge the battery. Step 14: When the electric energy stored in the winding boost energy storage module drops to the minimum energy storage value Vmin, the transistor IGBT1 is continuously closed to charge the winding boost energy storage module. At the same time, the transistor IGBT2 is disconnected to stop charging the battery. When the voltage value on the winding boost energy storage module reaches the maximum energy storage value Vmax, the transistor IGBT2 is closed again to charge the battery. The above cycle continues until the battery is fully charged. During the charging process, the single chip microcomputer controls the on and off of transistors IGBT1 and IGBT2 according to the voltage on the winding boost energy storage module, and adjusts the duty ratio of the first drive signal U3 and the second drive signal U4 according to the current signals I1 and I2.

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