Variable frequency resonance type lead-acid storage battery repairing instrument

Abstract

The application provides a variable-frequency resonance type lead-acid storage battery repair instrument, which comprises a control circuit and a power circuit; the control circuit is used for controlling the conduction or disconnection of each switch component of the power circuit according to a received repair signal, a charging signal or a discharging signal; the power circuit is used for inputting current oscillation waveforms with various frequencies to the lead-acid storage battery, making the lead-acid storage battery sulfuric acid lead crystal crack through resonance of the current oscillation waveforms and the sulfuric acid lead crystal, and realizing repair of the lead-acid storage battery, and is also used for charging or discharging the lead-acid storage battery according to the conduction or disconnection of each switch component. The lead-acid storage battery repair instrument of the application repairs the lead-acid storage battery through resonance of a variable-frequency resonance current waveform and a sulfuric acid lead crystal, has a simple circuit structure, good repair effect, and can realize charging and discharging test functions, detect the capacity of the battery, and test the repair effect without additional equipment, and is low in cost.

Description

Technical Field

[0001] This application relates to the field of lead-acid battery repair equipment technology, and in particular to a frequency conversion resonant lead-acid battery repair equipment. Background Technology

[0002] In flooded lead-acid batteries, water electrolysis produces gas at the end of charging. This gas carries acid mist, which corrodes surrounding equipment. Furthermore, flooded lead-acid batteries require regular electrolyte replenishment, necessitating frequent maintenance. Valve-regulated lead-acid (VRA) batteries, through their sealed structure, oxygen recombination cycle technology, and electrolyte fixation technology, overcome the main shortcomings of flooded lead-acid batteries in terms of maintenance, safety, installation, and environmental protection. This has led to the widespread application of VRA batteries in backup power supplies, energy storage systems, and communication equipment. Lead-acid batteries produce lead sulfate during discharge. If a lead-acid battery is not recharged promptly after discharge or is over-discharged, a large amount of lead sulfate crystals will form on the battery plates. These lead sulfate crystals cannot be reduced, ultimately leading to a decrease in battery capacity and a shortened battery lifespan.

[0003] Repairing sulfated lead-acid batteries can improve battery life, reduce environmental pollution, and avoid resource waste. However, existing repair devices generally suffer from poor repair results, complex circuit structures, and the potential to damage the batteries. Furthermore, existing repair devices lack charge-discharge testing capabilities, and verifying the repair effectiveness requires additional equipment, which is costly. Summary of the Invention

[0004] In view of this, this application provides a variable frequency resonant lead-acid battery repair device to solve the above-mentioned technical problems.

[0005] This application provides a variable frequency resonant lead-acid battery repair device, including: a control circuit and a power circuit; The control circuit is used to control the switching components of the power circuit to turn on or off according to the received repair signal, charging signal or discharging signal. The power circuit is used to input current oscillation waveforms of various frequencies into the lead-acid battery. By utilizing the resonance between the current oscillation waveforms and lead sulfate crystals, the lead sulfate crystals in the lead-acid battery are broken, thereby repairing the lead-acid battery. It is also used to charge or discharge the lead-acid battery according to the conduction or disconnection of various switching components.

[0006] In one possible implementation, the power circuit includes: a resonant repair circuit, a first reverse current protection diode D1, a first switching transistor Q1, a first discharge resistor R1, a relay K1, and a voltage and current sampling circuit; the anode of the first diode D1 is connected to the output terminal of the resonant repair circuit, the cathode of the first diode D1 is connected to the drain of the first switching transistor Q1 and the first terminal of the relay K1, and the source of the first switching transistor Q1 is connected to the first terminal of the discharge resistor R1; the second terminal of the discharge resistor R1 is connected to the output terminal of the resonant repair circuit and the input terminal of the voltage and current sampling circuit; the second terminal of the relay K1 is connected to the input terminal of the voltage and current sampling circuit; the output terminal of the voltage and current sampling circuit is connected to a lead-acid battery, and the voltage and current sampling circuit is used to collect the voltage and current signals of the resonant repair circuit and output them to the voltage and current sampling signal conditioning circuit and the lead-acid battery.

[0007] In one possible implementation, the resonant repair circuit is composed of N resonant repair units connected in series; each resonant repair unit includes a second inductor L2, a third inductor L3, a capacitor C1, a second diode D2, and a second switch Q2. The first end of the second inductor L2 is connected to the cathode of the diode D2, the second end of the second inductor L2 is connected to the first end of the third inductor L3 and the first end of the capacitor C1, the second end of the third inductor L3 is connected to the anode of the second diode D2 and the drain of the second switch Q2, and the second end of the capacitor C1 is connected to the source of the second switch Q2.

[0008] In one possible implementation, the number of the resonant repair units The values ​​of satisfy: The switching frequency of the second switch Q2 in the resonance repair unit varies from 20kHz to 80kHz, and the duty cycle varies from 0.05 to 0.8.

[0009] In one possible implementation, the power circuit further includes a switching power supply and a first inductor L1, wherein a first end of the first inductor L1 is connected to the output of the switching power supply and a second end of the first inductor L1 is connected to the input of the resonance repair circuit.

[0010] In one possible implementation, the control circuit includes a drive circuit for the resonant repair circuit, a charge / discharge control circuit, a voltage / current sampling signal conditioning circuit, and a controller; the drive circuit for the resonant repair circuit is connected to the controller and the resonant repair circuit respectively; the charge / discharge control circuit is connected to the controller, the gate of the first switching transistor Q1, and the relay K1 respectively; the voltage / current sampling signal conditioning circuit is connected to the controller and the voltage / current sampling circuit respectively. The driving circuit of the resonance repair circuit is used to receive and amplify the PWM control signal output by the controller, so as to turn on a preset number of second switching transistors in the resonance repair circuit. The charging and discharging control circuit is used to receive and amplify the PWM control signal output by the controller, turn on the first switch Q1 and the relay K1 to charge the lead-acid battery, and turn off the first switch Q1 and the relay K1 to discharge the lead-acid battery; The voltage and current sampling signal conditioning circuit is used to receive the voltage and current sent by the voltage and current sampling circuit, amplify or reduce the voltage and current, and then transmit them to the controller. The controller is used to send PWM control signals to the drive circuit and charge / discharge control circuit of the resonant repair circuit according to the received repair signal, charging signal or discharge signal.

[0011] In one possible implementation, the control circuit further includes: a driving circuit for a switching power supply, the driving circuit for the switching power supply being connected to both the controller and the switching power supply, and the driving circuit for the switching power supply being used to receive PWM control signals from the controller to turn the switching power supply on and off.

[0012] In one possible implementation, the controller is specifically configured to: upon receiving a repair signal, send an instruction to the drive circuit of the switching power supply to turn on the switching power supply; send a PWM control signal to the drive circuit of the resonant repair circuit to send a high level to a preset number of second switching transistors of the resonant repair circuit; and send a PWM control signal to the charge / discharge control circuit to send a high level to relay K1 and a low level to the first switching transistor Q1.

[0013] In one possible implementation, the controller is specifically configured to: upon receiving a charging signal, generate a PWM control signal for the duty cycle and frequency of the switching power supply using closed-loop control based on the set charging current and charging voltage, and send the PWM control signal to the driving circuit of the switching power supply so that the driving circuit of the switching power supply controls the switching power supply to output the set voltage and current; and send the PWM control signal to the charging and discharging control circuit so that the charging and discharging control circuit sends a high level to the relay K1 and a low level to the first switching transistor Q1.

[0014] In one possible implementation, the controller is specifically configured to: upon receiving a discharge signal, send a PWM control signal to the drive circuit of the switching power supply to turn off the switching power supply; send a PWM control signal to the charge / discharge control circuit to send a high level to the relay K1; and, based on the set discharge current, use closed-loop control to send a PWM control signal to the charge / discharge control circuit to adjust the duty cycle and frequency of the first switching transistor Q1 so that the discharge current is equal to the set current value.

[0015] The lead-acid battery repair device of this application utilizes the resonance between the frequency conversion resonant current waveform and the lead sulfate crystal to repair the lead-acid battery. It has a simple circuit structure, good repair effect, and can realize charge and discharge test function to detect the battery capacity. The repair effect can be tested without additional equipment, and the cost is low. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an overall structural block diagram of the variable frequency resonant lead-acid battery repair device provided in the embodiments of this application; Figure 2 A detailed structural block diagram of the variable frequency resonant lead-acid battery repair device provided in the embodiments of this application; Figure 3 A schematic diagram of the structure of a resonant repair circuit composed of N resonant repair units provided in an embodiment of this application; Figure 4 Experimental waveforms of the drive signal of the resonance repair circuit and the output voltage of the lead-acid battery repair device provided in the embodiments of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] First, a brief introduction to the design concept of the embodiments of this application will be given.

[0021] This application aims to address the shortcomings and deficiencies of existing technologies. Addressing the drawbacks of lead-acid battery repair systems, such as complex circuit structures that easily damage the battery, inability to perform charge / discharge testing, and poor repair results, this application proposes a variable-frequency resonant lead-acid battery repair device based on the high-frequency resonance repair method. The high-frequency resonance repair method utilizes the resonance principle of crystals. Lead sulfate crystals of a certain size possess an inherent resonant frequency. When the frequency of externally applied energy is exactly equal to this resonant frequency, the lead sulfate crystals resonate. During this resonance process, the lead sulfate crystals are gradually broken down into small particles of lead sulfate. These small particles of lead sulfate can be converted into lead and lead dioxide during charging, thereby restoring the battery's capacity. The high-frequency resonance repair method generates current oscillation waveforms of various frequencies through hardware circuitry. These current waveforms can resonate with lead sulfate crystals of different sizes, breaking them down and achieving the purpose of battery repair. After introducing the application scenarios and design concepts of the embodiments of this application, the technical solutions provided by the embodiments of this application will be described below.

[0022] like Figure 1 As shown in the figure, this application provides a frequency conversion resonant lead-acid battery repair device, including: a control circuit and a power circuit; The control circuit is used to control the switching components of the power circuit to turn on or off based on the received repair signal, charging signal, or discharging signal. The power circuit is used to input current oscillation waveforms of various frequencies into the lead-acid battery. By utilizing the resonance between the current oscillation waveform and the lead sulfate crystals, the lead sulfate crystals in the lead-acid battery are broken, thereby repairing the lead-acid battery. It is also used to charge or discharge the lead-acid battery according to the conduction or disconnection of various switching components.

[0023] The lead-acid battery repair device of this application utilizes the resonance between the frequency conversion resonant current waveform and the lead sulfate crystal to repair the lead-acid battery. It has a simple circuit structure, good repair effect, and can realize charge and discharge test function to detect the battery capacity. The repair effect can be tested without additional equipment, and the cost is low.

[0024] In some embodiments, such as Figure 2As shown, the power circuit includes: a resonant repair circuit, a first diode D1 to prevent reverse current, a first switching transistor Q1, a first discharge resistor R1, a relay K1, and a voltage and current sampling circuit. The anode of the first diode D1 is connected to the output terminal of the resonant repair circuit, and the cathode of the first diode D1 is connected to the drain of the first switching transistor Q1 and the first terminal of the relay K1. The source of the first switching transistor Q1 is connected to the first terminal of the discharge resistor R1. The second terminal of the discharge resistor R1 is connected to the output terminal of the resonant repair circuit and the input terminal of the voltage and current sampling circuit. The second terminal of the relay K1 is connected to the input terminal of the voltage and current sampling circuit. The output terminal of the voltage and current sampling circuit is connected to the lead-acid battery. The voltage and current sampling circuit is used to collect the voltage and current signals of the resonant repair circuit and output them to the voltage and current sampling signal conditioning circuit and the lead-acid battery.

[0025] In some embodiments, such as Figure 3 As shown, the resonant repair circuit consists of N resonant repair units connected in series. Each resonant repair unit includes a second inductor L2, a third inductor L3, a capacitor C1, a second diode D2, and a second switch Q2. The first end of the second inductor L2 is connected to the cathode of the diode D2. The second end of the second inductor L2 is connected to the first end of the third inductor L3 and the first end of the capacitor C1. The second end of the third inductor L3 is connected to the anode of the second diode D2 and the drain of the second switch Q2. The second end of the capacitor C1 is connected to the source of the second switch Q2.

[0026] In some embodiments, the number of resonant repair units The values ​​of satisfy: The switching frequency of the second switch Q2 in the resonance repair unit varies from 20kHz to 80kHz, and the duty cycle varies from 0.05 to 0.8.

[0027] Specifically, when repairing a small-capacity lead-acid battery, two resonance repair units are activated; when repairing a large-capacity lead-acid battery, five resonance repair units are activated.

[0028] In some embodiments, the power circuit further includes a switching power supply and a first inductor L1, wherein a first end of the first inductor L1 is connected to the output terminal of the switching power supply and a second end of the first inductor L1 is connected to the input terminal of the resonance repair circuit.

[0029] In some embodiments, the control circuit includes a drive circuit for the resonant repair circuit, a charge-discharge control circuit, a voltage and current sampling signal conditioning circuit, and a controller; the drive circuit for the resonant repair circuit is connected to the controller and the resonant repair circuit respectively; the charge-discharge control circuit is connected to the controller, the gate of the first switching transistor Q1, and the relay K1 respectively; the voltage and current sampling signal conditioning circuit is connected to the controller and the voltage and current sampling circuit respectively. The driving circuit of the resonance repair circuit is used to receive and amplify the PWM control signal output by the controller, so as to turn on a preset number of second switching transistors in the resonance repair circuit. The charging and discharging control circuit receives and amplifies the PWM (Pulse Width Modulation) control signal output by the controller, turning on the first switch Q1 and relay K1 to charge the lead-acid battery, and turning off the first switch Q1 and relay K1 to discharge the lead-acid battery. The voltage and current sampling signal conditioning circuit is used to receive the voltage and current sent by the voltage and current sampling circuit, amplify or reduce the voltage and current, and then transmit them to the controller. The controller is used to send PWM control signals to the drive circuit and charge / discharge control circuit of the resonant repair circuit according to the received repair signal, charging signal or discharge signal.

[0030] Specifically, such as Figure 2 As shown, the repair device also includes a display screen connected to the controller, allowing end users to select repair, charging, and discharging, thereby providing the controller with repair signals, charging signals, or discharging signals.

[0031] In some embodiments, the control circuit further includes: a driving circuit for a switching power supply, which is connected to both the controller and the switching power supply. The driving circuit for the switching power supply is used to receive PWM control signals from the controller to turn the switching power supply on and off.

[0032] In some embodiments, the controller is specifically configured to: when a repair signal is received, send an instruction to the drive circuit of the switching power supply to turn on the switching power supply; send a PWM control signal to the drive circuit of the resonant repair circuit to send a high level to a preset number of second switching transistors of the resonant repair circuit; and send a PWM control signal to the charge-discharge control circuit to send a high level to the relay K1 and a low level to the first switching transistor Q1.

[0033] In some embodiments, the controller is specifically configured to: when receiving a charging signal, generate a PWM control signal for the duty cycle and frequency of the switching power supply according to the set charging current and charging voltage using closed-loop control, send the PWM control signal to the driving circuit of the switching power supply so that the driving circuit of the switching power supply controls the switching power supply to output the set voltage and current; and send a PWM control signal to the charging and discharging control circuit so that the charging and discharging control circuit sends a high level to the relay K1 and a low level to the first switching transistor Q1.

[0034] In some embodiments, the controller is specifically configured to: when a discharge signal is received, send a PWM control signal to the drive circuit of the switching power supply to turn off the switching power supply; send a PWM control signal to the charge / discharge control circuit to send a high level to the relay K1; and send a PWM control signal to the charge / discharge control circuit using closed-loop control according to the set discharge current, so that the charge / discharge control circuit adjusts the duty cycle and frequency of the first switching transistor Q1 to make the discharge current equal to the set current value.

[0035] The technical solution of this application will be described in detail below with specific examples.

[0036] Specifically, in the first circuit example, the number of resonance repair units N is 2, and the specific circuit parameters are as follows: filter inductor L1 is 350μH, discharge resistor R1 is 0.42Ω, inductor L2 is 4mH, inductor L3 is 142μH, capacitor C1 is 100μF, inductor L4 is 4mH, inductor L5 is 142μH, capacitor C2 is 100μF, the switching frequency range is 20-80kHz, and the duty cycle range is 0.05-0.8.

[0037] In the second circuit example, the number of resonance repair units N is 5, and the specific circuit parameters are as follows: filter inductor L1 is 350μH, discharge resistor R1 is 0.42Ω, inductor L2 is 4mH, inductor L3 is 142μH, capacitor C1 is 100μF, inductor L4 is 4mH, inductor L5 is 142μH, capacitor C2 is 100μF, inductor L6 is 4mH, inductor L7 is 142μH, capacitor C3 is 100μF, inductor L8 is 4mH, inductor L9 is 142μH, capacitor C4 is 100μF, inductor L10 is 4mH, inductor L11 is 142μH, capacitor C5 is 100μF, the switching frequency range is 20-80kHz, and the duty cycle range is 0.05-0.8.

[0038] like Figure 4 As shown, the output voltage waveform of the lead-acid battery repair device is a DC component superimposed with a frequency conversion oscillation component. The DC component can charge the lead-acid battery, and the frequency conversion oscillation component can resonate with the lead sulfate crystal to repair the lead-acid battery.

[0039] Tests conducted through the first and second circuit examples revealed that the frequency conversion resonant lead-acid battery repair device in the first example could increase the capacity of a sulfated lead-acid battery from 8.7Ah to 9.6Ah, while the second example could increase it from 8.4Ah to 9.7Ah. This verifies that the frequency conversion resonant lead-acid battery repair device of this application has a good repair effect on sulfated lead-acid batteries. Furthermore, the frequency conversion resonant lead-acid battery repair device of this application can perform charge-discharge testing to detect battery capacity, and can test the repair effect without additional equipment, resulting in low cost.

[0040] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions targeted in the blocks may occur in a different order than those targeted in the drawings. For example, two consecutively represented blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0041] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

Claims

1. A variable frequency resonant lead-acid battery repair device, characterized in that, include: Control circuits and power circuits; The control circuit is used to control the switching components of the power circuit to turn on or off according to the received repair signal, charging signal or discharging signal. The power circuit is used to input current oscillation waveforms of various frequencies into the lead-acid battery. By utilizing the resonance between the current oscillation waveforms and lead sulfate crystals, the lead sulfate crystals in the lead-acid battery are broken, thereby repairing the lead-acid battery. It is also used to charge or discharge the lead-acid battery according to the conduction or disconnection of various switching components.

2. The variable frequency resonant lead-acid battery repair device according to claim 1, characterized in that, The power circuit includes: a resonant repair circuit, a first diode (D1) for preventing reverse current, a first switching transistor (Q1), a first discharge resistor (R1), a relay (K1), and a voltage and current sampling circuit. The anode of the first diode (D1) is connected to the output terminal of the resonant repair circuit, and the cathode of the first diode (D1) is connected to the drain of the first switching transistor (Q1) and the first terminal of the relay (K1). The source of the first switching transistor (Q1) is connected to the first terminal of the discharge resistor (R1). The second terminal of the discharge resistor (R1) is connected to the output terminal of the resonant repair circuit and the input terminal of the voltage and current sampling circuit. The second terminal of the relay (K1) is connected to the input terminal of the voltage and current sampling circuit. The output terminal of the voltage and current sampling circuit is connected to a lead-acid battery. The voltage and current sampling circuit is used to collect the voltage and current signals of the resonant repair circuit and output them to the voltage and current sampling signal conditioning circuit and the lead-acid battery.

3. The variable frequency resonant lead-acid battery repair device according to claim 2, characterized in that, The resonant repair circuit is composed of N resonant repair units connected in series. Each resonant repair unit includes a second inductor (L2), a third inductor (L3), a capacitor (C1), a second diode (D2), and a second switch (Q2). The first terminal of the second inductor (L2) is connected to the cathode of the diode (D2). The second terminal of the second inductor (L2) is connected to the first terminal of the third inductor (L3) and the first terminal of the capacitor (C1). The second terminal of the third inductor (L3) is connected to the anode of the second diode (D2) and the drain of the second switch (Q2). The second terminal of the capacitor (C1) is connected to the source of the second switch (Q2).

4. The variable frequency resonant lead-acid battery repair device according to claim 3, characterized in that, The number of resonance repair units The values ​​of satisfy: The switching frequency of the second switch (Q2) in the resonance repair unit varies from 20kHz to 80kHz, and the duty cycle varies from 0.05 to 0.

8.

5. The variable frequency resonant lead-acid battery repair device according to claim 2, characterized in that, The power circuit further includes a switching power supply and a first inductor (L1), the first end of the first inductor (L1) being connected to the output terminal of the switching power supply, and the second end of the first inductor (L1) being connected to the input terminal of the resonance repair circuit.

6. The variable frequency resonant lead-acid battery repair device according to claim 5, characterized in that, The control circuit includes a drive circuit for the resonance repair circuit, a charge / discharge control circuit, a voltage and current sampling signal conditioning circuit, and a controller; the drive circuit for the resonance repair circuit is connected to the controller and the resonance repair circuit respectively; the charge / discharge control circuit is connected to the controller, the gate of the first switching transistor (Q1), and the relay (K1) respectively; the voltage and current sampling signal conditioning circuit is connected to the controller and the voltage and current sampling circuit respectively. The driving circuit of the resonance repair circuit is used to receive and amplify the PWM control signal output by the controller, so as to turn on a preset number of second switching transistors in the resonance repair circuit. The charging and discharging control circuit is used to receive and amplify the PWM control signal output by the controller, turn on the first switch (Q1) and the relay (K1) to charge the lead-acid battery, and turn off the first switch (Q1) and the relay (K1) to discharge the lead-acid battery; The voltage and current sampling signal conditioning circuit is used to receive the voltage and current sent by the voltage and current sampling circuit, amplify or reduce the voltage and current, and then transmit them to the controller. The controller is used to send PWM control signals to the drive circuit and charge / discharge control circuit of the resonant repair circuit according to the received repair signal, charging signal or discharge signal.

7. The variable frequency resonant lead-acid battery repair device according to claim 6, characterized in that, The control circuit further includes a switching power supply drive circuit, which is connected to both the controller and the switching power supply. The switching power supply drive circuit is used to receive PWM control signals from the controller to turn the switching power supply on and off.

8. The variable frequency resonant lead-acid battery repair device according to claim 7, characterized in that, The controller is specifically used to: when a repair signal is received, send an instruction to the drive circuit of the switching power supply to turn on the switching power supply; send a PWM control signal to the drive circuit of the resonant repair circuit to send a high level to a preset number of second switching transistors of the resonant repair circuit; and send a PWM control signal to the charge and discharge control circuit to send a high level to the relay (K1) and a low level to the first switching transistor (Q1).

9. The variable frequency resonant lead-acid battery repair device according to claim 7, characterized in that, The controller is specifically used for: when receiving a charging signal, generating a PWM control signal for the duty cycle and frequency of the switching power supply according to the set charging current and charging voltage using closed-loop control, sending the PWM control signal to the driving circuit of the switching power supply so that the driving circuit of the switching power supply controls the switching power supply to output the set voltage and current; and sending a PWM control signal to the charging and discharging control circuit so that the charging and discharging control circuit sends a high level to the relay (K1) and a low level to the first switching transistor (Q1).

10. The variable frequency resonant lead-acid battery repair device according to claim 7, characterized in that, The controller is specifically used for: when receiving a discharge signal, sending a PWM control signal to the drive circuit of the switching power supply to turn off the switching power supply; sending a PWM control signal to the charge / discharge control circuit to send a high level to the relay (K1); and sending a PWM control signal to the charge / discharge control circuit using closed-loop control according to the set discharge current, so that the charge / discharge control circuit adjusts the duty cycle and frequency of the first switching transistor (Q1) to make the discharge current equal to the set current value.

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