Charger battery electric quantity detection circuit and aerial work platform charger

Abstract

The invention discloses a charger battery electric quantity detection circuit and an aerial work platform charger, and relates to the technical field of electrical measurement and battery management. The detection circuit comprises a voltage sampling module, a current sampling module and a microcontroller. Wherein the voltage sampling module is connected with a to-be-tested battery and is used for acquiring a real-time voltage signal of the to-be-tested battery; the current sampling module is connected in series in a main charging and discharging loop of the to-be-detected battery and is used for detecting a charging and discharging current signal of the to-be-detected battery; and the micro controller is electrically connected with the voltage sampling module and the current sampling module, and is used for receiving the real-time voltage signal and the charging and discharging current signal, and calculating the residual electric quantity of the battery to be measured based on an electric quantity metering algorithm. According to the SOC detection circuit, the reliability and the accuracy of the SOC detection circuit can be improved, and the virtual electricity condition is avoided.

Description

Technical Field

[0001] This invention relates to a battery power detection circuit for a charger and a charger for an aerial work platform, belonging to the field of electrical measurement and battery management technology. Background Technology

[0002] Aerial work platforms (such as scissor lifts and boom lifts) are widely used in construction, warehousing, and municipal engineering. Their power systems typically rely on lead-acid rechargeable battery packs. To ensure operational safety and efficiency, and to extend battery life, it is necessary to monitor the battery's remaining state of charge (SOC) in real time and accurately.

[0003] However, in practical applications, traditional SOC estimation methods lack sufficient accuracy. For example, relying solely on battery terminal voltage is often limited by the characteristics of lead-acid batteries, leading to significant deviations in the voltage signal. This deviation can cause the system to display a charge level that does not match the actual usable capacity, frequently resulting in the so-called "phantom charge" phenomenon—where the displayed charge level suddenly drops, or the inaccurate charge indicator affects operational judgment, posing potential safety hazards and maintenance challenges for high-altitude operations. Furthermore, some traditional solutions only provide a rough charge level classification (e.g., high / medium / low), failing to provide precise percentage or range estimations. Additionally, in critical over-discharge or overcharge states, the inability to promptly issue alarms or disconnect the circuit may damage battery life or even cause safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide a charger battery power detection circuit and a high-altitude work platform charger. By comprehensively analyzing and processing multi-dimensional parameters such as voltage and current, and combining them with a power metering algorithm, the accuracy and reliability of the SOC detection circuit are significantly improved, effectively avoiding the occurrence of "phantom power".

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0006] On one hand, the present invention provides a charger battery power detection circuit, comprising:

[0007] Voltage sampling module: connected to the battery under test, used to acquire the real-time voltage signal of the battery under test;

[0008] Current sampling module: connected in series in the main charging and discharging circuit of the battery under test, used to detect the charging and discharging current signal of the battery under test;

[0009] Microcontroller: Electrically connected to the voltage sampling module and the current sampling module respectively, used to receive the real-time voltage signal and the charging and discharging current signal, and calculate the remaining power of the battery under test based on the power metering algorithm.

[0010] Furthermore, the voltage sampling module includes a voltage divider unit and a filtering unit. The voltage divider unit divides and converts the high-voltage signal output by the battery under test to output a low-voltage signal that is compatible with the voltage signal acquisition terminal of the microcontroller. The filtering unit is connected between the voltage divider unit and the voltage signal acquisition terminal of the microcontroller and is used to filter and reduce noise in the low-voltage signal.

[0011] Furthermore, the voltage divider unit is a resistor network, which includes voltage divider resistors R1 and R2; the filter unit includes resistor R3 and filter capacitor C1; wherein, the battery under test is connected to ground in series with voltage divider resistors R1 and R2; the voltage signal acquisition terminal of the microcontroller is connected to ground in series with filter capacitor C1, and connected to the electrical contacts of voltage divider resistors R1 and R2 in series with resistor R3.

[0012] Furthermore, the current sampling module employs a Hall current sensor to convert the current signal of the main charging and discharging circuit into a voltage signal adapted to the voltage signal acquisition terminal of the microcontroller.

[0013] Furthermore, the current sampling module is a shunt resistor connected in series in the main charging and discharging circuit; the detection circuit also includes a differential amplifier unit, used to acquire and amplify the voltage difference signal across the shunt resistor and output a voltage signal adapted to the microcontroller.

[0014] Furthermore, the microcontroller determines whether the battery under test is in a critical state of overcharge or over-discharge based on the real-time voltage, current, and remaining charge of the battery under test.

[0015] When the system determines that it is in an overcharge critical state, the microcontroller generates a control signal to control the charger to stop charging or reduce the charging current.

[0016] When the system determines that the battery is in an over-discharge critical state, the microcontroller generates a control signal to cut off the main charge and discharge circuit of the battery under test.

[0017] Furthermore, the circuit also includes a temperature sampling module; the temperature sampling module is electrically connected to the microcontroller and is used to acquire the real-time temperature signal of the battery under test and send it to the microcontroller; the microcontroller determines the health status of the battery under test based on the voltage signal, current signal and temperature signal.

[0018] Furthermore, it also includes a communication interface module, which is electrically connected to the microcontroller and is used to send the remaining power and / or health status of the battery under test to an external device.

[0019] Furthermore, the communication interface module includes a CAN bus transceiver chip U3;

[0020] The CAN transmit pin CAN_TX of the microcontroller is connected to the data receive input terminal RX of the CAN bus transceiver chip U3.

[0021] The CAN receive pin CAN_RX of the microcontroller is connected to the data transmit output terminal TX of the CAN bus transceiver chip U3;

[0022] The power pin of the CAN bus transceiver chip U3 is connected to the power output terminal of the charger;

[0023] The ground pin of the CAN bus transceiver chip U3 is grounded;

[0024] The high differential signal output pin CAN_H and the low differential signal output pin CAN_L of the CAN bus transceiver chip U3 are used to connect to the CAN bus network of the external device.

[0025] On the other hand, the present invention provides a high-altitude work platform charger, which integrates the charger battery power detection circuit as described in any one of claims 1 to 9.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] This invention uses a voltage sampling module to acquire the real-time voltage signal of the battery under test, and adds a current sampling module to acquire the charging and discharging battery status. By combining the voltage and current parameters for joint analysis, it overcomes the technical bottleneck of single parameter limitation by the state of the battery under test and improves detection accuracy. At the same time, this invention calculates the remaining power and health status of the battery under test based on a power metering algorithm, providing accurate percentage or battery life estimation, rather than the rough classification in traditional technologies. This allows the microcontroller to issue control signals in a timely manner when the battery under test is in an over-discharge or overcharge critical state, improving the reliability of the SOC detection circuit and avoiding the occurrence of "phantom power". Attached Figure Description

[0028] Figure 1 The diagram shown is a schematic diagram of the charger battery power detection circuit provided in this application;

[0029] Figure 2 The diagram shown is a voltage sampling module circuit diagram in the charger battery power detection circuit provided in this application.

[0030] Figure 3 The diagram shown is a circuit diagram of the current sampling module in the charger battery power detection circuit provided in this application.

[0031] Figure 4 The diagram shows the pinout and peripheral interface definition of the microcontroller (MCU) in the charger battery power detection circuit provided in this application.

[0032] Figure 5 The diagram shown is a circuit diagram of the communication interface module in the charger battery power detection circuit provided in this application. Detailed Implementation

[0033] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0034] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0035] Example 1

[0036] See Figure 1 This embodiment introduces a charger battery power detection circuit, which is integrated inside the charger of an aerial work platform. The detection circuit includes a voltage sampling module, a current sampling module, and a microcontroller unit (MCU). The MCU is a microcontroller unit with a multi-channel ADC interface.

[0037] The voltage sampling module is connected to the battery under test and is used to acquire the real-time voltage signal of the battery under test. The voltage sampling module includes a voltage divider unit and a filtering unit. The voltage divider unit is used to convert the high voltage signal to a low voltage signal, and the filtering unit is used to filter out noise interference.

[0038] See Figure 2 The voltage divider unit is a resistor network, which includes voltage divider resistors R1 and R2; the filter unit is an RC low-pass filter, which includes resistor R3 and filter capacitor C1.

[0039] The formulas for calculating the voltage division of resistors R1 and R2 are as follows:

[0040] (1),

[0041] In the formula, This is the intermediate voltage. The voltage of the battery under test is represented by R1 and R2, which are the resistance values ​​of the voltage divider resistors R1 and R2, respectively. In this embodiment, a voltage divider unit is set up primarily to convert the high-voltage signal from the battery under test into a low-voltage signal suitable for subsequent processing. A suitable intermediate voltage can be obtained by selecting appropriate voltage divider resistors R1 and R2. .

[0042] Therefore, in this embodiment, high-precision voltage divider resistors R1 and R2 are selected to form a voltage divider unit, which divides the 24V / 48V / 80V battery voltage to a low-voltage signal of 0-3V suitable for the input range of the MCU's ADC pin.

[0043] The filtering unit mainly uses an RC low-pass filter to filter out high-frequency switching noise, electromagnetic interference, etc. introduced from the battery terminal or the line, to ensure that the voltage signal sent to the MCU is pure and stable, thereby ensuring sampling accuracy.

[0044] The formula for calculating the cutoff frequency of an RC low-pass filter is as follows:

[0045] (2),

[0046] In the formula, R3 is the cutoff frequency, C1 is the resistance value of R3, and C1 is the capacitance value of the filter capacitor C1. By selecting appropriate resistor R3 and filter capacitor C1, the cutoff frequency can be set to a range that is much higher than the effective frequency of battery voltage change, but much lower than the frequency of main interference noise, thus achieving effective filtering.

[0047] The first end of the voltage divider resistor R1 is connected to the positive terminal of the battery under test, and the second end is grounded through the voltage divider resistor R2. The connection point between the second end of the voltage divider resistor R1 and the first end of the voltage divider resistor R2 serves as the voltage divider output node. The first end of the resistor R3 is connected to the voltage divider output node, and the second end of the resistor R3 is connected to the voltage signal acquisition terminal of the MCU. The first end of the filter capacitor C1 is connected to the voltage signal acquisition terminal of the MCU, and the second end of the filter capacitor C1 is grounded.

[0048] The voltage sampling module outputs an analog voltage signal VO_MCUADC after passing through a voltage divider unit and a filter unit. This signal is then connected to the voltage signal acquisition terminal of the MCU to complete the analog-to-digital conversion of the battery voltage.

[0049] See Figure 3 The current sampling module is connected in series in the main charging and discharging circuit of the battery under test to detect the charging and discharging current signal of the battery under test. The current sampling module uses a Hall current sensor to convert the current signal of the main charging and discharging circuit into a voltage signal and output it to the current signal acquisition terminal of the MCU.

[0050] The current sampling module includes a Hall current sensor chip U2, a pull-up resistor R4, and a filter capacitor C2;

[0051] The power supply terminal of Hall current sensor chip U2 is connected to the power output terminal of the charger, which provides a +5V power supply voltage. The ground terminal of Hall current sensor chip U2 is grounded, and the signal output terminal of Hall current sensor chip U2 is connected to the current signal acquisition terminal of the MCU through a pull-up resistor R4. The filter capacitor C2 is connected between the ground terminal of Hall current sensor chip U2 and the current signal acquisition terminal of the MCU.

[0052] Pull-up resistor R4 serves as a current limiting protection in the circuit, limiting the maximum current that may flow into the signal acquisition terminal of the MCU and preventing instantaneous high voltage from damaging the MCU. Pull-up resistor R4 and filter capacitor C3 form a filter network, which is responsible for filtering out high-frequency switching noise, electromagnetic interference, etc. mixed in the output signal of the Hall sensor, making the signal smooth.

[0053] In this embodiment, an ACS712 Hall current sensor can be used. The output stage of this sensor typically requires a resistive load to ground to establish the correct operating point and ensure the linearity of the output. Therefore, this embodiment adds a load resistor R5 to the current sampling module, which can pull the signal terminal to a defined DC potential, ensuring that the signal is at a known voltage when static.

[0054] In this embodiment, the current sampling module completes the acquisition of the charging and discharging current signal of the battery under test, performs current-to-voltage conversion, and outputs a smooth voltage signal IO_MCUADC in the range of 0-3V, which is connected to the current signal acquisition terminal of the MCU.

[0055] See Figure 3 The MCU is electrically connected to the voltage sampling module and the current sampling module respectively, and is used to receive voltage signals and current signals, and calculate the remaining power and health status of the battery under test based on the power metering algorithm. The MCU adapted in this embodiment can be an STM32F series or TMS320F series chip. In this specific embodiment, the STM32F103C8T6 is selected as the core control unit U2. This model has rich GPIO interfaces, CAN communication peripherals and multi-channel ADC sampling function, which can adapt to the voltage and current sampling, data communication and other requirements of the charger battery power detection circuit.

[0056] The MCU integrates a power metering algorithm. In order to accurately calculate the remaining power (SOC) and state of health (SOH) of the battery under test, this embodiment uses a coulomb counting method combined with an open-circuit voltage method for calculation. The coulomb counting method is used to perform real-time and continuous charge accumulation measurement during the battery charging and discharging process. At the same time, the open-circuit voltage method is used to calibrate and correct the SOC when the battery is at rest, so as to eliminate the long-term drift problem caused by the cumulative error of the coulomb counting method.

[0057] The MCU performs analog-to-digital conversion on the signal VO_MCUADC output from the voltage sampling module through the first ADC channel to obtain the real-time battery terminal voltage V(t); the MCU performs analog-to-digital conversion on the signal IO_MCUADC output from the current sampling module through the second ADC channel to obtain the real-time current I(t).

[0058] The calculation formula for the Coulomb count method is as follows:

[0059] (3),

[0060] In the formula, Let be the remaining battery power at the current time t. This is the initial charge level. For the battery's rated capacity, The current is obtained through real-time sampling; the MCU performs numerical integration on the continuous current sampling values, combines them with the known battery rated capacity, and updates and outputs the SOC value based on the current integration in real time.

[0061] The specific implementation method of the open-circuit voltage method is as follows:

[0062] Step S1: When the MCU detects... If the battery remains below the threshold for a specified period of time, it is determined that the battery has entered a "quasi-open circuit" state.

[0063] Step S2: Read the stable V(t) as the open-circuit voltage estimate V ocv The MCU internally stores the OCV-SOC lookup table for this battery model, based on V... ocv The calibration reference value SOC is obtained by referring to the table. ocv ;

[0064] Step S3: Using SOC ocv A one-time reset or weighted fusion of the current SOC is performed to eliminate long-term drift in the coulomb count. After correction, the coulomb integral will restart from the new accurate base point.

[0065] State of Charge (SOH) can be reflected by the percentage of capacity decay. During a complete charge-discharge cycle, the actual throughput charge Q is calculated by the MCU using coulomb counting. actualThe formula for calculating the degree of battery aging is as follows:

[0066] (3),

[0067] The MCU determines whether the battery under test is in a critical state of overcharge or over-discharge based on the real-time voltage, current, and remaining charge. If a critical state is detected, a protection control signal is generated.

[0068] When the MCU determines that it is in an overcharge critical state, it generates a control signal to control the charger to stop charging or reduce the charging current.

[0069] When the system determines that the battery is in an over-discharge critical state, the MCU generates a control signal to cut off the main charging and discharging circuit of the battery under test.

[0070] Example 2

[0071] Based on the same inventive concept as Embodiment 1, see also Figure 1 Because the chemical properties of a battery are significantly affected by temperature, its effective capacity, internal resistance, and open-circuit voltage V... ocv The relationship between SOC and SOH changes with temperature. Therefore, in order to accurately reflect the SOC and SOH of the battery under test, this embodiment adds a temperature sampling module based on embodiment 1.

[0072] The temperature sampling module is electrically connected to the MCU and is used to acquire the real-time temperature signal of the battery under test and send it to the MCU.

[0073] The temperature sampling module includes a temperature sensor, which is placed at key temperature measurement points on the surface of the battery under test to directly measure the battery's temperature and transmit the real-time temperature signal to the MCU. The MCU internally stores or generates a family of OCV-SOC relationship curves or capacity temperature correction coefficients for different temperatures using algorithms. When using the coulomb counting method combined with the open-circuit voltage method, the corresponding curve is selected or coefficients are corrected based on the real-time temperature, thereby eliminating calculation errors introduced by temperature and ensuring high accuracy in SOC estimation across the entire temperature range.

[0074] Battery aging is often accompanied by increased internal resistance and changes in thermal characteristics. Therefore, the MCU determines the health status of the battery under test based on the voltage signal, current signal and temperature signal.

[0075] Example 3

[0076] See Figure 5Based on the same inventive concept as other embodiments, this embodiment adds a communication interface module to facilitate data interaction with external devices, namely the main controller or remote monitoring terminal of the aerial work platform, in order to facilitate data interaction. The communication interface module is electrically connected to the MCU and is used to send the remaining power and / or health status data of the battery under test to the external device to provide early warning of maintenance needs.

[0077] Example 4

[0078] To provide a high-precision, low-cost alternative to current detection, and based on the same inventive concept as other modules in Embodiment 1, the current sampling module in this embodiment uses a shunt resistor connected in series in the main charging and discharging circuit; the detection circuit also includes a differential amplifier unit, used to acquire and amplify the voltage difference signal across the shunt resistor and output a voltage signal adapted to the microcontroller.

[0079] The communication interface can communicate with external devices and the MCU via CAN bus, RS485, UART, or wireless modules (such as Wi-Fi, 4G, Bluetooth) to achieve data exchange.

[0080] In this embodiment, the CAN bus is preferred as the communication method. The CAN bus has a multi-master architecture, high reliability, excellent anti-electromagnetic interference capability, and a mature industrial application ecosystem, which perfectly meets the reliable data interaction requirements of the complex electrical environment of the aerial work platform.

[0081] The communication interface module includes a CAN bus transceiver chip U3; wherein, the CAN transmit pin CAN_TX of the microcontroller is connected to the data receive input terminal RX of the CAN bus transceiver chip U3;

[0082] The microcontroller's CAN receive pin CAN_RX is connected to the data transmit output terminal TX of the CAN bus transceiver chip U3;

[0083] The power pin of the CAN bus transceiver chip U3 is connected to the power output terminal of the charger;

[0084] The ground pin of the CAN bus transceiver chip U3 is grounded;

[0085] The high differential signal output pin CAN_H and the low differential signal output pin CAN_L of the CAN bus transceiver chip U3 are used to connect to the CAN bus network of external devices.

[0086] To match the characteristic impedance of the bus and suppress signal reflection, a terminating matching resistor R6 is connected between CAN_H and CAN_L; wherein, the resistance value of R6 is set to 120Ω; the power output terminal of the charger provides a +5V power supply voltage.

[0087] Through the platform gateway, data can be further uploaded to the cloud server via wireless networks, such as 4G / 5G, supporting remote real-time monitoring, historical data analysis, and predictive maintenance, greatly improving equipment management efficiency.

[0088] Example 4

[0089] Based on the implementation ideas of embodiments 1-3, the current sampling module in this embodiment uses an external current sensor or shunt resistor, and the signal conditioning unit includes an isolation amplifier or a differential amplifier to isolate or amplify the output signal; when a shunt resistor is used, the signal conditioning unit adopts a differential amplifier as a specific implementation.

[0090] A shunt resistor is connected in series in the main charging and discharging circuit of the battery under test to generate a millivolt-level differential voltage signal proportional to the circuit current. The signal conditioning unit is a differential amplifier circuit, the core of which includes an operational amplifier and peripheral matching resistors (forming a differential amplifier unit). The two input terminals of the differential amplifier circuit are electrically connected to the two ends of the shunt resistor to acquire weak differential voltage signals. Its output terminal is electrically connected to the current signal acquisition terminal of the MCU.

[0091] The differential amplifier circuit can amplify the voltage difference signal across the shunt resistor with high precision and low temperature drift, convert it into a voltage signal that matches the MCU's ADC input range (e.g., 0-3.3V), thereby enabling accurate measurement of the main charging and discharging circuit current. This solution has the advantages of low cost and high accuracy, and is suitable for cost-sensitive scenarios requiring high-precision measurements.

[0092] Example 5

[0093] Based on the implementation idea of ​​Example 4, this example uses an external Hall current sensor.

[0094] An external Hall current sensor is installed in the main charging and discharging circuit of the battery, and its signal output is led out to the outside of the charger. Since there may be a potential difference between the sensor and the charger motherboard or interference introduced by long-distance transmission, a signal conditioning unit is required to provide electrical isolation and signal conditioning functions.

[0095] The signal conditioning unit at this point is an isolation amplifier, such as an isolation operational amplifier module employing opto-isolation or magnetic isolation principles. The input terminal of the isolation amplifier is connected to the signal output terminal of an external Hall current sensor to receive its output current or voltage signal. The output terminal of the isolation amplifier is electrically connected to the current signal acquisition terminal of the MCU.

[0096] This isolation amplifier first achieves electrical isolation between the charger's internal circuitry and external sensors, ensuring system safety and preventing high-voltage crosstalk. Secondly, it performs necessary amplification, level conversion, or filtering on the sensor signal, outputting a clean and safe voltage signal that matches the MCU's ADC input characteristics. This solution is suitable for external sensor detection scenarios requiring high electrical safety and strong anti-interference capabilities.

[0097] Example 6

[0098] This embodiment introduces a charger for aerial work platforms, which integrates the charger battery power detection circuit of any one of embodiments 1 to 5.

[0099] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0100] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A charger battery power detection circuit, characterized in that, The detection circuit includes: Voltage sampling module: connected to the battery under test, used to acquire the real-time voltage signal of the battery under test; Current sampling module: connected in series in the main charging and discharging circuit of the battery under test, used to detect the charging and discharging current signal of the battery under test; Microcontroller: Electrically connected to the voltage sampling module and the current sampling module respectively, used to receive the real-time voltage signal and the charging and discharging current signal, and calculate the remaining power of the battery under test based on the power metering algorithm.

2. The charger battery power detection circuit according to claim 1, characterized in that, The voltage sampling module includes a voltage divider unit and a filtering unit. The voltage divider unit divides and converts the high voltage signal output by the battery under test to output a low voltage signal that is compatible with the voltage signal acquisition terminal of the microcontroller. The filtering unit is connected between the voltage divider unit and the voltage signal acquisition terminal of the microcontroller and is used to filter and reduce noise in the low voltage signal.

3. The charger battery power detection circuit according to claim 2, characterized in that, The voltage divider unit is a resistor network, which includes voltage divider resistors R1 and R2; the filter unit includes resistor R3 and filter capacitor C1; wherein, the battery under test is connected to ground in series with voltage divider resistors R1 and R2; the voltage signal acquisition terminal of the microprocessor microcontroller is connected to ground in series with filter capacitor C1, and connected to the electrical contacts of voltage divider resistors R1 and R2 in series with resistor R3.

4. The charger battery power detection circuit according to claim 1, characterized in that, The current sampling module uses a Hall current sensor chip U2 to convert the current signal of the main charging and discharging circuit into a voltage signal adapted to the voltage signal acquisition terminal of the microprocessor microcontroller. The current sampling module also includes a pull-up resistor R4 and a filter capacitor C2. The power supply terminal of the Hall current sensor chip U2 is connected to the power output terminal of the charger, the ground terminal of the Hall current sensor chip U2 is grounded, and the signal output terminal of the Hall current sensor chip U2 is connected to the current signal acquisition terminal of the microcontroller through the pull-up resistor R4. The filter capacitor C2 is connected between the ground terminal of the Hall current sensor chip U2 and the current signal acquisition terminal of the microcontroller.

5. The charger battery power detection circuit according to claim 1, characterized in that, The current sampling module is a shunt resistor connected in series in the main charging and discharging circuit; the detection circuit also includes a differential amplifier unit, which is used to collect and amplify the voltage difference signal across the shunt resistor and output a voltage signal adapted to the microcontroller.

6. The charger battery power detection circuit according to claim 1, characterized in that, The microcontroller determines whether the battery under test is in a critical state of overcharge or over-discharge based on the real-time voltage, current, and remaining charge of the battery under test. When the system determines that it is in an overcharge critical state, the microcontroller generates a control signal to control the charger to stop charging or reduce the charging current. When the system determines that the battery is in an over-discharge critical state, the microcontroller generates a control signal to cut off the main charge and discharge circuit of the battery under test.

7. The charger battery power detection circuit according to claim 1, characterized in that, The circuit also includes a temperature sampling module; the temperature sampling module is electrically connected to the microcontroller and is used to acquire the real-time temperature signal of the battery under test and send it to the microcontroller; the microcontroller determines the health status of the battery under test based on the voltage signal, current signal and temperature signal.

8. The charger battery power detection circuit according to claim 7, characterized in that, It also includes a communication interface module, which is electrically connected to the microcontroller and is used to send the remaining power and / or health status data of the battery under test to an external device.

9. The charger battery power detection circuit according to claim 8, characterized in that, The communication interface module includes a CAN bus transceiver chip U3; The CAN transmit pin CAN_TX of the microcontroller is connected to the data receive input terminal RX of the CAN bus transceiver chip U3. The CAN receive pin CAN_RX of the microcontroller is connected to the data transmit output terminal TX of the CAN bus transceiver chip U3; The power pin of the CAN bus transceiver chip U3 is connected to the power output terminal of the charger; The ground pin of the CAN bus transceiver chip U3 is grounded; The high differential signal output pin CAN_H and the low differential signal output pin CAN_L of the CAN bus transceiver chip U3 are used to connect to the CAN bus network of the external device.

10. A charger for aerial work platforms, characterized in that, The charger battery power detection circuit according to any one of claims 1 to 9 is integrated.

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