CN118611222A - A dual-output lithium battery charging system - Google Patents

Abstract

The present application provides a dual-output lithium battery charging system, which relates to the field of lithium battery charging technology, including: an AC input circuit for providing AC input; a first charging circuit, including a first primary side and a first secondary side; a second charging circuit, including a second primary side and a second secondary side; the AC input circuit is connected to the first charging circuit and the second charging circuit respectively. The present application can solve the technical problem of low charging efficiency in the prior art due to the lithium battery charging system usually providing a single output. By adopting a dual-output design, it is possible to charge two devices at the same time, achieving the technical effect of improving charging efficiency.

Description

A dual-output lithium battery charging system

Technical Field

The present application relates to the technical field of lithium battery charging, and in particular to a dual-output lithium battery charging system.

Background Art

Lithium batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, lithium ions are embedded and de-embedded back and forth between the two electrodes. With the widespread use of power tools, lithium batteries, as their key power source, have penetrated into the daily work of all walks of life. However, the current status of lithium battery charger technology has restricted the continuous use performance of power tools to a certain extent. At present, most of the common power tool lithium battery chargers on the market adopt a design that can only charge one battery at a time, which not only limits the charging speed, but also affects the accuracy of charging control. In the modern fast-paced working environment, the contradiction between the mobility of power tools and the battery life is becoming more and more prominent. Due to the limitations of the charger, it is often impossible to charge multiple batteries at the same time in a short time. In addition, the inaccuracy of the current charger in controlling the charging method has also become a problem that needs to be solved urgently. Inaccurate charging control may cause the battery to be overcharged or over-discharged, thereby damaging the battery performance, shortening the battery life, and even posing a safety hazard. In order to meet these challenges, an additional charger is used, but this undoubtedly increases the purchase cost and the inconvenience of carrying.

In summary, the prior art has a technical problem in that the lithium battery charging system usually provides a single output, resulting in low charging efficiency.

Summary of the invention

The purpose of the present application is to provide a dual-output lithium battery charging system to solve the technical problem in the prior art that the lithium battery charging system usually provides a single output, resulting in low charging efficiency.

In view of the above problems, the present application provides a dual-output lithium battery charging system, wherein the dual-output lithium battery charging system includes: an AC input circuit, which is used to provide AC input; a first charging circuit, which includes a first primary side and a first secondary side; a second charging circuit, which includes a second primary side and a second secondary side; wherein the AC input circuit is connected to the first charging circuit and the second charging circuit respectively.

In a feasible implementation, the first charging circuit includes: a first primary side, the first primary side includes a rectifier circuit, a PWM control circuit, a primary reference circuit, a primary sampling circuit, and a power conversion circuit; a first secondary side, the first secondary side includes a secondary rectifier filter circuit, a voltage sampling circuit, a secondary reference circuit, an output-anti-reverse connection circuit, a battery voltage detection circuit, a calibration detection circuit, a current detection circuit, a communication circuit, and an MCU processing circuit; a feedback loop, the feedback loop is respectively connected to the first primary side and the first secondary side, and is used to feed back the adjustment information required by the first secondary side to the first primary side in real time; wherein the first secondary side is connected to the first primary side through the power conversion circuit.

In a feasible implementation, the PWM control circuit in the first primary side is connected to the rectifier circuit, the primary reference circuit, the primary sampling circuit, and the power conversion circuit respectively.

In a feasible implementation, the output end of the feedback loop is connected to the PWM control circuit in the first primary side, the input end of the feedback loop is connected to the MCU processing circuit in the first secondary side, and the output end of the secondary rectifier and filter circuit; wherein the feedback loop transmits the adjustment information to the PWM control circuit, and performs negative feedback control based on the PWM control circuit to adjust the duty cycle of the power conversion circuit.

In a feasible implementation, the MCU processing circuit in the first secondary side is respectively connected to the voltage sampling circuit, the secondary reference circuit, the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit; the target lithium battery is respectively connected to the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit, and the target lithium battery is charged through the output-anti-reverse connection circuit and interacts with the MCU processing circuit through the communication circuit; wherein the battery voltage detection circuit and the current detection circuit are respectively connected to the calibration detection circuit.

In a feasible implementation, the first secondary side also includes: a state response circuit, which responds to the output state signal of the MCU processing circuit through an LED for visual display; and a program burning circuit, which is used to burn the MCU processing circuit online.

In a feasible implementation manner, the second primary side has a structure consistent with the first primary side, and the second secondary side has a structure consistent with the first secondary side.

In a feasible implementation, the dual-output lithium battery charging system also includes a protection circuit, and the protection circuit includes a first protection circuit and a second protection circuit respectively located between the AC input circuit and the first primary side, and between the AC input circuit and the second primary side.

In a feasible implementation, the dual-output lithium battery charging system further includes an RCD absorption circuit, and the RCD absorption circuit is respectively located on the first primary side and the second primary side.

One or more technical solutions provided in this application have at least the following technical effects or advantages:

A dual-output lithium battery charging system includes an AC input circuit, the AC input circuit is used to provide AC input; a first charging circuit, the first charging circuit includes a first primary side and a first secondary side; a second charging circuit, the second charging circuit includes a second primary side and a second secondary side; wherein the AC input circuit is connected to the first charging circuit and the second charging circuit respectively. That is to say, by adopting a dual-output design, it is possible to charge two devices at the same time, achieving the technical effect of improving charging efficiency.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically cited below. It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easy to understand through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

FIG1 is a schematic structural diagram of a dual-output lithium battery charging system of the present application;

FIG. 2 is a schematic diagram of the circuit structure of a dual-output lithium battery charging system of the present application.

DETAILED DESCRIPTION

The present application provides a dual-output lithium battery charging system, which solves the technical problem in the prior art that the lithium battery charging system usually provides a single output, resulting in low charging efficiency. By adopting a dual-output design, it is possible to charge two devices at the same time, achieving the technical effect of improving charging efficiency.

Below, the technical solutions in the present application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments of the present application. It should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. It should also be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, rather than all of them.

Embodiment, please refer to FIG1, the present application provides a dual-output lithium battery charging system, wherein the dual-output lithium battery charging system comprises:

An AC input circuit, the AC input circuit is used to provide AC input; a first charging circuit, the first charging circuit includes a first primary side and a first secondary side; a second charging circuit, the second charging circuit includes a second primary side and a second secondary side; wherein the AC input circuit is connected to the first charging circuit and the second charging circuit respectively.

Specifically, the AC input circuit is the entrance of the charging system, which is responsible for receiving the AC power provided by the outside. Safety and efficiency need to be considered to ensure that the AC power can be stably received and converted. The first charging circuit is one of the cores of the charging system, including the first primary side and the first secondary side. The first primary side usually includes a rectifier and power conversion part, which converts the AC input into a DC power suitable for charging the lithium battery. The first secondary side includes multiple functional circuits, such as a secondary rectifier filter circuit, a voltage sampling circuit, etc., which are used to achieve precise control and monitoring of the charging process. The design of the first charging circuit needs to ensure that the battery can be charged efficiently and stably. Similar to the first charging circuit, the second charging circuit also includes a second primary side and a second secondary side. This design enables the charging system to charge two batteries at the same time, improving the charging efficiency. The AC input circuit is connected to the first charging circuit and the second charging circuit respectively. This connection method allows the two charging circuits to work independently without interfering with each other, and also facilitates the distribution and management of energy. The design of this dual-output lithium battery charging system is intended to improve the charging efficiency while ensuring the safety and stability of the charging process. Through the independent charging circuit design, the system can charge two batteries at the same time, which helps to improve energy utilization efficiency.

Furthermore, the first charging circuit in the dual-output lithium battery charging system includes:

A first primary side, the first primary side includes a rectifier circuit, a PWM control circuit, a primary reference circuit, a primary sampling circuit, and a power conversion circuit; a first secondary side, the first secondary side includes a secondary rectifier filter circuit, a voltage sampling circuit, a secondary reference circuit, an output-anti-reverse connection circuit, a battery voltage detection circuit, a calibration detection circuit, a current detection circuit, a communication circuit, and an MCU processing circuit; a feedback loop, the feedback loop is respectively connected to the first primary side and the first secondary side, and is used to feed back the adjustment information required by the first secondary side to the first primary side in real time; wherein the first secondary side is connected to the first primary side through the power conversion circuit.

Specifically, as shown in Figure 2, the first primary side includes a rectifier circuit, a PWM control circuit, a primary reference circuit, a primary sampling circuit, and a power conversion circuit. Among them, the rectifier circuit includes rectifier bridges BD1 and EC1, which convert AC power into DC power. It is the starting stage of the charging process and provides a stable DC power supply for the subsequent charging process; the PWM control circuit is composed of a reference circuit composed of components such as D2, R17, and EC3 to control the charging process, achieve precise voltage and current regulation, and can dynamically adjust the output power according to the battery status and charging requirements, thereby improving the charging efficiency and battery life; the primary reference circuit is composed of components such as R7, R8, R18, EC2, and C6, which is the PWM control circuit. The circuit provides a reference for voltage and current to ensure the stable operation of the charging system; the primary sampling circuit is composed of U3, ZD1, C3, R15, R16, C5 and other components, which are used to monitor and control key parameters in the charging process, such as current and voltage, and provide feedback information for the control circuit; the power conversion circuit includes T1, Q2, R9, R10, R11, R12, R13, R19, R14, U1, which converts the primary power to the secondary, that is, reduces the voltage to a low voltage suitable for use on the secondary side to meet the charging needs of the battery.

The first secondary side includes a secondary rectifier filter circuit, a voltage sampling circuit, a secondary reference circuit, an output-anti-reverse connection circuit, a battery voltage detection circuit, a calibration detection circuit, a current detection circuit, a communication circuit, and an MCU processing circuit. Among them, the secondary rectification and filtering circuit includes D3, EC4, and R22, which rectify and filter the signal coupled from the transformer and convert the low-voltage DC output of the power conversion circuit into smooth DC; the voltage sampling circuit is composed of R47, R23, R24, R29, C9, C8, Q4, R27, R25, C10, R26, R28, and U3 for voltage sampling, and receives the signal sent by the MCU to control the output voltage; the secondary reference circuit includes D4, R35, U7, and EC5, which provide a reference voltage for the MCU power supply and other circuits; the output-anti-reverse connection circuit composed of U6, U10, DZ3, R36, R37, Q1, and R38 prevents the battery from reverse charging during the charging process and protects the charger and battery from damage; the battery voltage detection circuit is composed of R32, R31, Q2, and Q 3. Components such as R30, R34, R33, and C11 are connected between the battery pack and the MCU to sample the battery pack voltage in real time. The calibration detection circuit is used to simulate the specific conditions of each product in actual operation by using other circuits of this product through an external standard power supply when the product is turned on in standby mode to ensure that the product meets the standard requirements. The current detection circuit composed of components such as R40, R39, and C13 samples the battery charging current in real time and sends it to the MCU. The MCU determines whether the discharge and charging current is overcurrent or open circuit. R49, C12, and ZD2 constitute a communication line for information exchange between the battery pack and the charger MCU. The MCU determines the capacity and type of the battery pack based on the information and determines the charging current of the charger. The MCU processing circuit is responsible for processing various signals and controlling the charging process.

The feedback loop is composed of U3, ZD1, C3, R15, R16, and C5, which feeds back the information that needs to be adjusted on the secondary side to the primary U1 in real time. The function of this feedback loop is to achieve precise control of the charging process and improve charging efficiency and safety. The feedback circuit connects the primary side and the secondary side, and feeds back the information that needs to be adjusted on the secondary side to the primary side in real time, so as to realize dynamic monitoring and adjustment of the charging process. The power conversion circuit connects the first secondary side and the first primary side, and is responsible for reducing the voltage to a low voltage suitable for the secondary side, that is, converting the electric energy on the primary side into electric energy suitable for battery charging, and then charging the lithium battery. Through the power conversion circuit, the first secondary side and the first primary side realize the transmission and conversion of electric energy, allowing the electric energy on the primary side to be efficiently converted into electric energy suitable for battery charging, while ensuring the stability and safety of the charging process.

For example, when the output current is 5A, it flows through the current sampling circuit, and the 11th pin of the MCU (microcontroller) will collect a standard voltage value as the basis for current control. When the output current drops to 4.5A, the voltage value sampled by the MCU will decrease. At this time, the 5th pin of the MCU will send a low signal to Q4, which is an optocoupler. The light emission of the optocoupler weakens, causing the signal received by the receiving end to also weaken. The weakened optocoupler signal is sent to the 7th pin of the PWM (pulse width modulation) power chip U1. U1 is a negative feedback power chip. When the received signal weakens, it increases the duty cycle of PWM. The increase in the PWM duty cycle causes the transformer to transfer more primary power to the secondary, thereby increasing the output current until it reaches the set value of 5A. If the output current is too large, the MCU will adopt the opposite control method to the current when it is too small, that is, reduce the duty cycle of PWM, thereby reducing the output current and ensuring that the current is stable at the set value. Through precise current sampling and feedback control mechanism, the charger can adjust the output current in real time to keep it stable near the set value, thereby improving the accuracy and efficiency of charging.

Furthermore, as shown in FIG1 , in the dual-output lithium battery charging system, the PWM control circuit in the first primary side is respectively connected to the rectifier circuit, the primary reference circuit, the primary sampling circuit, and the power conversion circuit.

Specifically, the connection between the PWM control circuit and the rectifier circuit allows the PWM control circuit to adjust the working state of the rectifier circuit according to the charging demand, thereby optimizing the charging efficiency; the connection with the primary reference circuit ensures that the PWM control circuit can obtain an accurate reference signal from the primary reference circuit, adjust the power output on the primary side, and then accurately control the voltage and current during the charging process; the primary sampling circuit is used to monitor the voltage or current on the primary side, and the PWM control circuit monitors the voltage and current on the primary side in real time through the primary sampling circuit, and adjusts the control strategy according to these feedback information to maintain the stability of the charging process; the power conversion circuit is responsible for converting the primary power to the secondary, and the connection between the PWM control circuit and the power conversion circuit enables the PWM control to directly control the power conversion process on the primary side, thereby achieving accurate control of the output voltage and current. The PWM control circuit can adjust the working state of the power conversion circuit according to the output of the rectifier circuit, the reference signal of the primary reference circuit, and the sampling data of the primary sampling circuit. This control method can achieve accurate power regulation, thereby adapting to the needs of different charging stages and battery states.

Furthermore, as shown in Figure 1, the output end of the feedback loop is connected to the PWM control circuit in the first primary side, the input end of the feedback loop is connected to the MCU processing circuit in the first secondary side, and the output end of the secondary rectifier and filter circuit; wherein the feedback loop transmits the adjustment information to the PWM control circuit, and performs negative feedback control based on the PWM control circuit to adjust the duty cycle of the power conversion circuit.

Specifically, the output end of the feedback loop is connected to the PWM control circuit in the first primary side, and the feedback loop can transmit the adjustment information of the secondary side to the PWM control circuit. The input end is connected to the MCU processing circuit in the first secondary side, and the MCU processing circuit is responsible for processing information from the battery and other detection circuits and determining the parameters that need to be adjusted. In addition, the input end of the feedback loop is also connected to the output end of the secondary rectifier filter circuit, so that the feedback loop can directly obtain real-time information of the charging state from the secondary side. Based on the negative feedback control mechanism of the PWM control circuit, the feedback loop can adjust the duty cycle of the power conversion circuit. The information required to be adjusted on the first secondary side is transmitted to the PWM control circuit, and then negative feedback control is performed based on the PWM control circuit to adjust the duty cycle of the power conversion circuit. When the charging state of the secondary side changes, the feedback loop can adjust the power output of the primary side in time to maintain the stability of the charging process. Through close cooperation with the PWM control circuit and the MCU processing circuit, precise control of the charging process is achieved.

Furthermore, the MCU processing circuit in the first secondary side is respectively connected to the voltage sampling circuit, the secondary reference circuit, the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit; the target lithium battery is respectively connected to the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit, and the target lithium battery is charged through the output-anti-reverse connection circuit and interacts with the MCU processing circuit through the communication circuit; wherein the battery voltage detection circuit and the current detection circuit are respectively connected to the calibration detection circuit.

Specifically, the MCU processing circuit is connected to the voltage sampling circuit to monitor and control the output voltage of the charger. The secondary reference circuit provides a stable reference voltage or current for the MCU to ensure the stable operation of the MCU processing circuit. The output-anti-reverse connection circuit prevents the battery from being reversed and protects the charger and the battery. The connection between the MCU processing circuit and the output-anti-reverse connection circuit ensures the safety of the charging process. The battery voltage detection circuit monitors the battery voltage in real time to prevent overcharging. The connection between the MCU processing circuit and the battery voltage detection circuit helps to achieve precise control of the battery status. The calibration detection circuit is used to ensure the performance consistency of the charger under different working conditions. The connection with the MCU processing circuit helps to improve the accuracy and reliability of the charger. The current detection circuit monitors the charging current to prevent overcurrent. The connection with the MCU processing circuit helps to achieve precise control of the charging process. The communication circuit allows information exchange between the battery and the charger MCU. The connection with the MCU processing circuit realizes intelligent communication and control between the charger and the battery. The target lithium battery is connected to the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit. It is charged through the output-anti-reverse connection circuit and interacts with the MCU processing circuit through the communication circuit to achieve intelligent charging control. The battery can send information about its status to the MCU, such as the current voltage, remaining power, etc. At the same time, the MCU can also send control signals to the battery, such as charging current, voltage setting, etc. Through the communication circuit, the MCU can monitor the status of the battery in real time and adjust the charging strategy based on this information, including adjusting the charging current and voltage, and starting or stopping the charging process. The calibration detection circuit is connected to the voltage detection circuit and the current detection circuit. The calibration detection circuit can adjust the voltage and current settings of the charger based on the voltage and current data monitored in real time. Through the close connection between the MCU processing circuit and multiple key detection and control circuits, precise control of the charging process is achieved.

Furthermore, the first secondary side also includes:

A state response circuit, which responds to the output state signal of the MCU processing circuit through an LED for visual display; a program burning circuit, which is used to burn the MCU processing circuit online.

Specifically, as shown in FIG2 , the state response circuit responds to the output state signal of the MCU processing circuit through an LED light to realize a visual display of the charging state. Components such as R48, R42, and R43 receive the information sent by the MCU and indicate the charging state and different alarm functions through corresponding LED lights. For example, when the charger starts charging, charging is completed, the battery is full, or there are other state changes, the MCU will send a corresponding signal, and the state response circuit will indicate these states by turning the LED light on or off or changing the color. This improves the user's intuitive understanding of the charging state and increases the user-friendliness of the charger. The program burning circuit is used to burn the MCU processing circuit online, that is, to update the firmware program of the MCU. CON2 is the online burning program port, which allows engineers or users to update the charger's software without disassembling the charger to fix known problems, optimize performance, or add new functions. The online burning function improves the maintainability and flexibility of the charger, enabling it to adapt to changing technical requirements and user needs. The design of the two additional function circuits, the state response circuit and the program burning circuit, enhances the overall performance and user experience of the charger, and improves the practicality and adaptability of the charger through state visualization and online program updates.

Further, the second primary side has a structure consistent with the first primary side, and the second secondary side has a structure consistent with the first secondary side.

Specifically, the second primary side has the same structure as the first primary side, including a rectifier circuit, a PWM control circuit, a primary reference circuit, a primary sampling circuit, and a power conversion circuit. The second secondary side has the same structure as the first secondary side, including a secondary rectifier filter circuit, a voltage sampling circuit, a secondary reference circuit, an output-anti-reverse connection circuit, a battery voltage detection circuit, a calibration detection circuit, a current detection circuit, a communication circuit, and an MCU processing circuit. The structure of the second primary side and the second secondary side is the same as that of the first primary side and the first secondary side, and the same or similar components and circuit layouts can be used during the design and manufacturing process, thereby simplifying the design and production process. When parts need to be replaced or upgraded, since the structures of the two charging circuits are consistent, the parts are interchangeable, which reduces costs and increases maintenance speed.

Furthermore, the dual-output lithium battery charging system also includes a protection circuit, which includes a first protection circuit and a second protection circuit respectively located between the AC input circuit and the first primary side, and between the AC input circuit and the second primary side.

Specifically, as shown in FIG2 , the protection circuit is composed of F1, RT1, L1, RX1, RX2, CX1, L2, and CX2, wherein F1 is a fuse, RT is a thermistor or carbon film resistor, RX1 and RX2 are winding resistors, CX1 and CX2 are capacitors, and L1 and L2 are inductors. When AC power is turned on, the current will pass through the protection circuit to protect the product. The protection circuit includes two parts, namely, a first protection circuit and a second protection circuit. The first protection circuit is located between the AC input circuit and the first primary side, and provides protection during the AC input stage to prevent overvoltage, overcurrent or other electrical faults from damaging the first primary side, including fuses, circuit breakers, overvoltage protection elements, etc., for realizing fast disconnection of the circuit, absorbing overvoltage and current, and protecting the safe operation of the circuit. The second protection circuit is located between the AC input circuit and the second primary side. Similar to the first protection circuit, the second protection circuit provides protection during the AC input stage to prevent overvoltage, overcurrent or other electrical faults from damaging the second primary side, and also includes fuses, circuit breakers, overvoltage protection elements, etc. The protection circuit is designed to ensure the safe operation of the charging system. By setting a protection circuit between the AC input circuit and the primary side, additional safety isolation can be provided when there is a problem with the power supply to prevent electrical faults from causing damage to the system.

Furthermore, the dual-output lithium battery charging system further includes an RCD absorption circuit, and the RCD absorption circuit is respectively located on the first primary side and the second primary side.

Specifically, as shown in FIG2 , the RCD absorption circuit is a network composed of C1, R1, R2, R3, R4, R5, R8, C2, and D1, which absorbs voltage spikes and current overloads that may occur in the circuit to protect circuit components from damage. The RCD absorption circuits are located on the first primary side and the second primary side, respectively, and each primary side has an independent RCD absorption circuit to provide more comprehensive protection. By adding RCD absorption circuits at key locations, it helps prevent the circuit on the primary side from being damaged due to external interference or internal faults, ensuring stable operation of the system without causing interference to other devices.

In summary, the dual-output lithium battery charging system provided by the present application has the following technical effects:

A dual-output lithium battery charging system includes an AC input circuit, the AC input circuit is used to provide AC input; a first charging circuit, the first charging circuit includes a first primary side and a first secondary side; a second charging circuit, the second charging circuit includes a second primary side and a second secondary side; wherein the AC input circuit is connected to the first charging circuit and the second charging circuit respectively. That is to say, by adopting a dual-output design, it is possible to charge two devices at the same time, achieving the technical effect of improving charging efficiency.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the present application and its equivalent technology, the present application is also intended to include these modifications and variations.

Claims (9)

1. A dual-output lithium battery charging system, comprising: An AC input circuit, the AC input circuit is used to provide AC input; a first charging circuit, the first charging circuit comprising a first primary side and a first secondary side; a second charging circuit, the second charging circuit comprising a second primary side and a second secondary side; Wherein, the AC input circuit is connected to the first charging circuit and the second charging circuit respectively. 2. A dual-output lithium battery charging system as claimed in claim 1, characterized in that the first charging circuit comprises: A first primary side, the first primary side comprising a rectifier circuit, a PWM control circuit, a primary reference circuit, a primary sampling circuit, and a power conversion circuit; A first secondary side, the first secondary side includes a secondary rectification and filtering circuit, a voltage sampling circuit, a secondary reference circuit, an output-anti-reverse connection circuit, a battery voltage detection circuit, a calibration detection circuit, a current detection circuit, a communication circuit, and an MCU processing circuit; A feedback loop, the feedback loop being connected to the first primary side and the first secondary side respectively, and being used for feeding back adjustment information required by the first secondary side to the first primary side in real time; Wherein, the first secondary side is connected to the first primary side through the power conversion circuit. 3. A dual-output lithium battery charging system as described in claim 2, characterized in that the PWM control circuit in the first primary side is connected to the rectifier circuit, the primary reference circuit, the primary sampling circuit, and the power conversion circuit respectively. 4. A dual-output lithium battery charging system as claimed in claim 3, characterized in that the output end of the feedback loop is connected to the PWM control circuit in the first primary side, and the input end of the feedback loop is connected to the MCU processing circuit in the first secondary side and the output end of the secondary rectifier and filter circuit; The feedback loop transmits the adjustment information to the PWM control circuit, and performs negative feedback control based on the PWM control circuit to adjust the duty cycle of the power conversion circuit. 5. A dual-output lithium battery charging system as claimed in claim 2, characterized in that it comprises: The MCU processing circuit in the first secondary side is respectively connected to the voltage sampling circuit, the secondary reference circuit, the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit; The target lithium battery is respectively connected to the output-anti-reverse connection circuit, the battery voltage detection circuit, the calibration detection circuit, the current detection circuit, and the communication circuit, and the target lithium battery is charged through the output-anti-reverse connection circuit and interacts with the MCU processing circuit through the communication circuit; Wherein, the battery voltage detection circuit and the current detection circuit are respectively connected to the calibration detection circuit. 6. A dual-output lithium battery charging system as claimed in claim 5, characterized in that the first secondary side further comprises: A state response circuit, wherein the state response circuit responds to the output state signal of the MCU processing circuit through an LED for visual display; A program burning circuit is used to perform online burning on the MCU processing circuit. 7. A dual-output lithium battery charging system as claimed in claim 1, characterized in that it comprises: The second primary side has a structure consistent with the first primary side, and the second secondary side has a structure consistent with the first secondary side. 8. A dual-output lithium battery charging system as described in claim 1, characterized in that the dual-output lithium battery charging system also includes a protection circuit, and the protection circuit includes a first protection circuit and a second protection circuit respectively located between the AC input circuit and the first primary side, and between the AC input circuit and the second primary side. 9. A dual-output lithium battery charging system as claimed in claim 1, characterized in that the dual-output lithium battery charging system further comprises an RCD absorption circuit, and the RCD absorption circuit is respectively located at the first primary side and the second primary side.