Two-way independent control output constant current charging device of PCC box

Abstract

The utility model belongs to the field of battery charging control, specifically related to a two -way independent control output constant current charging device of PCC box, including control circuit, boost output circuit, first output control circuit and second output control circuit, the first output of control circuit is connected with the input of boost output circuit, is used for controlling the working condition of boost output circuit, the second output of control circuit is connected with the first input of first output control circuit, is used for sending PWM control signal to first output control circuit, to accurately regulate output current, the first input of control circuit is connected with the first output of first output control circuit, is used for receiving voltage / current sampling feedback signal from first output control circuit, the utility model can realize two -way completely independent constant current charging control, supports small -capacity electric core safe charging simultaneously, has promoted the convenience of use and scene adaptability.

Description

Technical Field

[0001] This utility model relates to the field of battery charging control, specifically to a constant current charging device with two independent control outputs for a PCC box. Background Technology

[0002] Existing PCC charging cases typically use a constant voltage output method for charging. While this method is simple in structure and low in cost, it cannot safely and effectively charge small-capacity battery cells. Because small-capacity battery cells (such as those with a capacity of less than 100mAh) are extremely sensitive to charging current, excessive charging current can easily lead to overheating, shortened lifespan, or even safety issues.

[0003] In addition, existing PCC charging boxes often cannot achieve two independent and adjustable current outputs when charging multiple devices at the same time, which means they cannot charge battery cells of different specifications and capacities at the same time, resulting in low flexibility and adaptability.

[0004] Therefore, it is necessary to provide a new PCC box with two independent control output constant current charging devices. Utility Model Content

[0005] Based on the aforementioned problems in the existing technology, the purpose of this utility model embodiment is to provide a PCC box with two independent control output constant current charging device, which can realize two completely independent constant current charging control, while supporting safe charging of small capacity cells, and improving the convenience of use and adaptability to various scenarios.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a PCC box with two independent control output constant current charging device, including a control circuit, a boost output circuit, a first output control circuit and a second output control circuit; The first output terminal of the control circuit is connected to the input terminal of the boost output circuit, and is used to control the working state of the boost output circuit. The second output terminal of the control circuit is connected to the first input terminal of the first output control circuit and is used to send a PWM control signal to the first output control circuit to precisely adjust the output current; the third output terminal of the control circuit is connected to the first input terminal of the second output control circuit and is used to send a PWM control signal to the second output control circuit to precisely adjust the output current. The first input terminal of the control circuit is connected to the first output terminal of the first output control circuit, and is used to receive voltage / current sampling feedback signals from the first output control circuit to form closed-loop control; the second input terminal of the control circuit is connected to the first output terminal of the second output control circuit, and is used to receive voltage / current sampling feedback signals from the second output control circuit to form closed-loop control.

[0007] Furthermore, the first output terminal of the boost output circuit is connected to the second input terminal of the first output control circuit to provide the boosted operating voltage to the first output control circuit. The second output terminal of the boost output circuit is connected to the second input terminal of the second output control circuit, and is used to provide the boosted operating voltage to the second output control circuit.

[0008] Furthermore, the dual-channel independent control output constant current charging device also includes a first charging management circuit, a second charging management circuit, a first battery cell, and a second battery cell; The second output terminal of the first output control circuit is connected to the input terminal of the first charging management circuit, and is used to output the first constant current charging power supply to the first charging management circuit; the second output terminal of the second output control circuit is connected to the input terminal of the second charging management circuit, and is used to output the second constant current charging power supply to the second charging management circuit. The output terminal of the first charging management circuit is connected to the input terminal of the first battery cell to provide a stable and safe charging current for the first battery cell; the output terminal of the second charging management circuit is connected to the input terminal of the second battery cell to provide a stable and safe charging current for the second battery cell.

[0009] Furthermore, the control circuit includes a main control chip MCU, and the first output control circuit includes a detection resistor R46, an NPN transistor Q4, and a field-effect transistor Q5.

[0010] Furthermore, one end of the detection resistor R46 is connected to the VCC_BAT port of the first charging management circuit to provide a detection voltage when the first battery cell is inserted, and to maintain a high level when the first battery cell is not inserted.

[0011] Furthermore, pin 1 of the NPN transistor Q4 is connected in series with resistor R39 and then connected to pin VOUT_EN1_P0_3 of the main control chip MCU to receive the PWM signal sent by the main control chip MCU and control the conduction / cutoff of the NPN transistor Q4.

[0012] Furthermore, pin 3 of the NPN transistor Q4 is connected to pin 1 of the G terminal of the field-effect transistor Q5, which is used to pull down the gate level of the field-effect transistor Q5 when the NPN transistor Q4 is turned on, thereby controlling the turn-on and turn-off of the field-effect transistor Q5.

[0013] Furthermore, pin 2 of the S terminal of the field-effect transistor Q5 is connected to the 5V_OUT port of the boost output circuit to receive the boosted operating voltage; pin 3 of the D terminal of the field-effect transistor Q5 is also connected in series with resistor R41 and then connected to the RLL1_ADC_P1_5 pin of the main control chip MCU to feed back the detected voltage status to the main control chip MCU to detect whether the first cell is inserted.

[0014] Furthermore, the first output control circuit also includes a voltage divider resistor R47 and a current sampling resistor R30. One end of the voltage divider resistor R47 is connected to the negative terminal P1- of the first battery cell for voltage divider sampling of the output voltage; the other end of the voltage divider resistor R47 is connected to the RLH1_ADC_P1_2 pin of the main control chip MCU for feeding back the sampled voltage signal to the main control chip MCU to monitor the charging status.

[0015] Furthermore, the second output control circuit includes a detection resistor R36, an NPN transistor Q1, and a field-effect transistor Q2.

[0016] The beneficial effects of this utility model are as follows: The dual-channel independent control output constant current charging device for the PCC box provided by this utility model, through the setting of independent output control circuits and charging management circuits, allows the control circuits to perform PWM adjustment on the two outputs separately, realizing two completely independent constant current charging control, thus improving the system's flexibility and applicability; through a closed-loop feedback mechanism and precise PWM control, it can output an adjustable, constant, safe low current, suitable for the charging needs of small-capacity battery cells, effectively avoiding battery cell damage or safety hazards caused by excessive current; it can simultaneously charge two battery cells or devices with different specifications and capacities, and the current of each channel can be independently and precisely controlled, improving the convenience of use and scenario adaptability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] In the picture: Figure 1 A schematic diagram of the structure of the PCC box with two independent control output constant current charging devices provided in this embodiment of the utility model; Figure 2 A circuit diagram of the first output control circuit provided for an embodiment of this utility model; Figure 3A circuit diagram of the second output control circuit provided in an embodiment of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0020] like Figure 1 As shown, an embodiment of this utility model provides a dual-channel independent control output constant current charging device for a PCC box, comprising a control circuit 1, a boost output circuit 2, a first output control circuit 3, a second output control circuit 4, a first charging management circuit 5, a second charging management circuit 6, a first battery cell 7, and a second battery cell 8.

[0021] In some embodiments, the first output terminal of control circuit 1 is connected to the input terminal of boost output circuit 2, and is used to control the operating state of boost output circuit 2. The second output terminal of control circuit 1 is connected to the first input terminal of first output control circuit 3, and is used to send a PWM control signal to first output control circuit 3 to precisely adjust the output current. The third output terminal of control circuit 1 is connected to the first input terminal of second output control circuit 4, and is used to send a PWM control signal to second output control circuit 4 to precisely adjust the output current. The first input terminal of control circuit 1 is connected to the first output terminal of first output control circuit 3, and is used to receive voltage / current sampling feedback signals from first output control circuit 3 to form closed-loop control. The second input terminal of control circuit 1 is connected to the first output terminal of second output control circuit 4, and is used to receive voltage / current sampling feedback signals from second output control circuit 4 to form closed-loop control.

[0022] In some embodiments, the first output terminal of the boost output circuit 2 is connected to the second input terminal of the first output control circuit 3, and is used to provide the boosted operating voltage to the first output control circuit 3. The second output terminal of the boost output circuit 2 is connected to the second input terminal of the second output control circuit 4, and is used to provide the boosted operating voltage to the second output control circuit 4.

[0023] In some embodiments, the second output terminal of the first output control circuit 3 is connected to the input terminal of the first charging management circuit 5, for outputting a first constant current charging power supply to the first charging management circuit 5. The second output terminal of the second output control circuit 4 is connected to the input terminal of the second charging management circuit 6, for outputting a second constant current charging power supply to the second charging management circuit 6. The output terminal of the first charging management circuit 5 is connected to the input terminal of the first battery cell 7, for providing a stable and safe charging current to the first battery cell 7. The output terminal of the second charging management circuit 6 is connected to the input terminal of the second battery cell 8, for providing a stable and safe charging current to the second battery cell 8.

[0024] The control circuit 1 in this invention's dual-channel independent control output constant current charging device can control the operation of the boost output circuit 2, and the boost output circuit 2 can provide operating voltages to the first output control circuit 3 and the second output control circuit 4 respectively. The control circuit 1 independently controls the first output control circuit 3 and the second output control circuit 4, and can charge the first battery cell 7 and the second battery cell 8 with the same or different constant currents. The two circuits operate completely independently and do not interfere with each other. In addition, the adjustable, constant, safe small current output by the first output control circuit 3 and the second output control circuit 4 can charge small-capacity battery cells, and can charge two devices with different specifications and capacities at the same time, and can achieve precise current control and no interference, improving the convenience and flexibility of use.

[0025] In some embodiments, the control circuit 1 includes a main control chip (MCU). Specifically, the circuit of the first output control circuit 3 is as follows: Figure 2As shown, the first output control circuit 3 includes a sensing resistor R46, an NPN transistor Q4, and a field-effect transistor Q5. The NPN transistor Q4 is an RS3804T, and the field-effect transistor Q5 is an NP3401MR. One end of the sensing resistor R46 is connected to the VCC_BAT port of the first charging management circuit 5 to provide the detection voltage when the first battery cell 7 is inserted, and maintains a high level when the first battery cell 7 is not inserted. The other end of the sensing resistor R46 is connected to pin 3 of the drain terminal of the field-effect transistor Q5 to transmit the output voltage status to the detection point. Pin 1 of the NPN transistor Q4 is connected in series with resistor R39 and then connected to the VOUT_EN1_P0_3 pin of the main control chip MCU to receive the PWM signal from the main control chip MCU and control the on / off state of the NPN transistor Q4. The end of series resistor R39 furthest from pin 1 of NPN transistor Q4 is connected in series with resistor R44 and then grounded. This provides a defined pull-down level to the base of NPN transistor Q4, preventing false turn-on and ensuring the stability of the control signal. Pin 2 of NPN transistor Q4 is grounded. Pin 3 of NPN transistor Q4 is connected to pin 1 of the gate (G) terminal of MOSFET Q5. This connection pulls down the gate level of MOSFET Q5 when NPN transistor Q4 is on, thus controlling the turn-on and turn-off of MOSFET Q5. Pin 2 of the source (S) terminal of MOSFET Q5 is connected to the 5V_OUT port of boost output circuit 2 to receive the boosted operating voltage. Pin 3 of the drain (D) terminal of MOSFET Q5 is connected in series with resistor R41 and then connected to the RLL1_ADC_P1_5 pin of the main control chip MCU. This connection feeds back the detected voltage status to the main control chip MCU to detect whether the first battery cell 7 is inserted. Pin 3 of the drain terminal of MOSFET Q5 is also connected to the positive P1+ port of the first battery cell 7, which is used to provide a stable and safe charging current to the first battery cell 7 when MOSFET Q5 is turned on. Among them, the sensing resistor R46 is 3MΩ, resistor R39 is 1KΩ, resistor R44 is 10KΩ, and resistor R41 is 100KΩ.

[0026] In some embodiments, the first output control circuit 3 further includes a voltage divider resistor R47 and a current sampling resistor R30. One end of the voltage divider resistor R47 is connected to the negative terminal P1- of the first battery cell 7 for voltage divider sampling of the output voltage. The other end of the voltage divider resistor R47 is connected to the RLH1_ADC_P1_2 pin of the main control chip MCU for feeding back the sampled voltage signal to the main control chip MCU to monitor the charging status. The other end of the voltage divider resistor R47 is also connected in series with a filter capacitor C11 and then grounded to filter out high-frequency noise in the sampled signal, improving sampling accuracy and system stability. One end of the current sampling resistor R30 is connected to the negative terminal P1- of the first battery cell 7 for series connection with the first battery cell 7, and the magnitude of the charging current is indirectly detected by measuring the voltage drop across its two ends. The other end of the current sampling resistor R30 is grounded to provide a ground loop for the charging current. The voltage divider resistor R47 is 100KΩ, the current sampling resistor R30 is 2R, and the filter capacitor C11 is 1UF.

[0027] In some embodiments, current-limiting resistors R38, R40, and R42 are connected in parallel between pin 2 (S terminal) and pin 3 (D terminal) of the MOSFET Q5, respectively. These resistors shunt and limit the current input to the boost output circuit 2 through the 5V_OUT port, preventing damage to the MOSFET Q5 due to excessive current and ensuring the stability of the output current. Resistors R38, R40, and R42 are all 300Ω.

[0028] In some embodiments, the first output control circuit 3 operates as follows: when the first battery cell 7 is inserted, the positive and negative terminals of the first battery cell 7 are connected to the P1+ and P1- ports of the first output control circuit 3; at this time, the detection resistor R46 forms a path with the first battery cell 7, and the voltage state of the D terminal of the field-effect transistor Q5 changes; and is transmitted to the RLL1_ADC_P1_5 pin of the main control chip MCU through the resistor R41; the main control chip MCU determines that the first battery cell 7 is inserted by monitoring the level change of the RLL1_ADC_P1_5 pin and prepares to start charging. Subsequently, the main control chip MCU outputs a PWM (Pulse Width Modulation) signal through the VOUT_EN1_P0_3 pin. The PWM signal reaches the base of NPN transistor Q4 through the current-limiting resistor R39. When the PWM signal is high, NPN transistor Q4 is turned on; when the PWM signal is low, NPN transistor Q4 is turned off. When NPN transistor Q4 is turned on, the voltage at pin 3 of NPN transistor Q4 is pulled low, which is equivalent to pulling the level at pin 1 of the gate (G) terminal of MOSFET Q5 low. At this time, pin 2 of the source (S) terminal of MOSFET Q5 and pin 3 of the drain (D) terminal of MOSFET Q5 are connected. Then, the power supplied from the 5V_OUT port of the boost output circuit 2 flows to the P1+ port through MOSFET Q5, starting to charge the first battery cell 7.

[0029] Additionally, during the charging of the first cell 7, the charging current flows through the current sampling resistor R30, generating a voltage drop proportional to the current across R30, reflecting the real-time charging current magnitude. The voltage divider resistor R47 divides the voltage output to the first cell 7. The filter capacitor C11 filters out high-frequency noise in the sampling signal; the divided voltage signal is sent to the RLH1_ADC_P1_2 pin of the main control chip MCU; the main control chip MCU calculates the current output current. The main control chip MCU compares the actual current value obtained from the sampling calculation with an internally preset constant current value. Based on the comparison result, the main control chip MCU dynamically adjusts the duty cycle of the PWM signal output from the VOUT_EN1_P0_3 pin, thereby regulating the charging current magnitude.

[0030] In some embodiments, the circuit of the second output control circuit 4 is as follows: Figure 3As shown, the second output control circuit 4 includes a sensing resistor R36, an NPN transistor Q1, and a field-effect transistor Q2. The NPN transistor Q1 is an RS3904T, and the field-effect transistor Q5 is an NP3401MR. One end of the sensing resistor R36 is connected to the VCC_BAT port of the second charging management circuit 6 to provide the detection voltage when the second battery cell 8 is inserted, and maintains a high level when the second battery cell 8 is not inserted. The other end of the sensing resistor R36 is connected to pin 3 of the drain terminal of the field-effect transistor Q2 to transmit the output voltage status to the detection point. Pin 1 of the NPN transistor Q1 is connected in series with resistor R29 and then connected to the VOUT_EN2_P0_4 pin of the main control chip MCU to receive the PWM signal from the main control chip MCU and control the on / off state of the NPN transistor Q1. The end of series resistor R29 furthest from pin 1 of NPN transistor Q1 is connected in series with resistor R33 and then grounded. This provides a defined pull-down level to the base of NPN transistor Q1, preventing false turn-on and ensuring the stability of the control signal. Pin 2 of NPN transistor Q1 is grounded. Pin 3 of NPN transistor Q1 is connected to pin 1 of the gate (G) terminal of MOSFET Q2. This pulls down the gate level of MOSFET Q2 when NPN transistor Q1 is on, thus controlling the turn-on and turn-off of MOSFET Q2. Pin 2 of the source (S) terminal of MOSFET Q2 is connected to the 5V_OUT port of boost output circuit 2 to receive the boosted operating voltage. Pin 3 of the drain (D) terminal of MOSFET Q2 is connected in series with resistor R31 and then to pin RLL2_ADC_P1_6 of the main control chip MCU. This feeds back the detected voltage status to the main control chip MCU to detect whether the second battery cell 8 is inserted. Pin 3 of the drain terminal of MOSFET Q2 is also connected to the positive P1+ terminal of the second battery cell 8, which is used to provide a stable and safe charging current to the second battery cell 8 when MOSFET Q2 is turned on. Among them, the sensing resistor R36 is 3MΩ, resistor R29 is 1KΩ, resistor R33 is 10KΩ, and resistor R31 is 100KΩ.

[0031] In some embodiments, the second output control circuit 4 further includes a voltage divider resistor R37 and a current sampling resistor R32. One end of the voltage divider resistor R37 is connected to the negative terminal P1- of the second battery cell 8 for voltage division sampling of the output voltage. The other end of the voltage divider resistor R37 is connected to the RLH2_ADC_P1_1 pin of the main control chip MCU for feeding back the sampled voltage signal to the main control chip MCU to monitor the charging status. The other end of the voltage divider resistor R37 is also connected in series with a filter capacitor C9 and then grounded to filter out high-frequency noise in the sampled signal, improving sampling accuracy and system stability. One end of the current sampling resistor R32 is connected in series with the negative terminal P1- of the second battery cell 8 to indirectly detect the charging current by measuring the voltage drop across it. The other end of the current sampling resistor R32 is grounded to provide a ground loop for the charging current. The voltage divider resistor R37 is 100KΩ, the current sampling resistor R32 is 2R, and the filter capacitor C9 is 1UF.

[0032] In some embodiments, current-limiting resistors R28, R34, and R35 are connected in parallel between pin 2 (S terminal) and pin 3 (D terminal) of the MOSFET Q2, respectively. These resistors shunt and limit the current input to the boost output circuit 2 through the 5V_OUT port, preventing damage to the MOSFET Q2 due to excessive current and ensuring the stability of the output current. All resistors R28, R34, and R35 are 300Ω.

[0033] In some embodiments, the second output control circuit 4 operates as follows: when the second battery cell 8 is inserted, the positive and negative terminals of the second battery cell 8 are connected to the P1+ and P1- ports of the second output control circuit 4; at this time, the detection resistor R36 forms a path with the second battery cell 8, and the voltage state of the D terminal of the field-effect transistor Q2 changes; and is transmitted to the RLL2_ADC_P1_6 pin of the main control chip MCU through the resistor R31; the main control chip MCU determines that the second battery cell 8 is inserted by monitoring the level change of the RLL2_ADC_P1_6 pin and prepares to start charging. Subsequently, the main control chip MCU outputs a PWM (Pulse Width Modulation) signal through the VOUT_EN2_P0_4 pin. The PWM signal reaches the base of NPN transistor Q1 through the current-limiting resistor R29. When the PWM signal is high, NPN transistor Q1 is turned on; when the PWM signal is low, NPN transistor Q1 is turned off. When NPN transistor Q1 is turned on, the voltage at pin 3 of NPN transistor Q1 is pulled low, which is equivalent to pulling low the level at pin 1 of the gate (G) terminal of MOSFET Q2. At this time, pin 2 of the source (S) terminal of MOSFET Q2 and pin 3 of the drain (D) terminal of MOSFET Q2 are connected. Then, the power supplied from the 5V_OUT port of the boost output circuit 2 flows to the P1+ port through MOSFET Q2, starting to charge the second battery cell 8.

[0034] Additionally, during the charging of the second cell 8, the charging current flows through the current sampling resistor R32, generating a voltage drop proportional to the current across R32, reflecting the real-time charging current magnitude. The voltage divider resistor R37 divides the voltage output to the second cell 8. The filter capacitor C9 filters out high-frequency noise from the sampling signal; the divided voltage signal is sent to the RLH2_ADC_P1_1 pin of the main control chip MCU; the main control chip MCU calculates the current output current. The main control chip MCU compares the actual current value obtained from the sampling calculation with an internally preset constant current value. Based on the comparison result, the main control chip MCU dynamically adjusts the duty cycle of the PWM signal output from the VOUT_EN2_P0_4 pin, thereby regulating the charging current magnitude.

[0035] This utility model's PCC box dual-output constant current charging device, through the setting of independent output control circuits and charging management circuits, allows the control circuit 1 to separately adjust the two outputs using PWM, achieving completely independent constant current charging control for the two channels, thus improving the system's flexibility and applicability. Through a closed-loop feedback mechanism and precise PWM control, it can output an adjustable, constant, safe low current, suitable for charging small-capacity battery cells, effectively avoiding battery cell damage or safety hazards caused by excessive current. It can simultaneously charge two battery cells or devices of different specifications and capacities, and the current of each channel can be independently and precisely controlled, greatly improving ease of use and scenario adaptability. Simultaneously, through voltage / current sampling feedback and closed-loop control of the main control chip, the PWM duty cycle is dynamically adjusted to ensure the constant and accurate output current.

[0036] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A dual-channel independently controlled constant current charging device for a PCC box, characterized in that, It includes a control circuit, a boost output circuit, a first output control circuit, and a second output control circuit; The first output terminal of the control circuit is connected to the input terminal of the boost output circuit, and is used to control the working state of the boost output circuit. The second output terminal of the control circuit is connected to the first input terminal of the first output control circuit and is used to send a PWM control signal to the first output control circuit to precisely adjust the output current; the third output terminal of the control circuit is connected to the first input terminal of the second output control circuit and is used to send a PWM control signal to the second output control circuit to precisely adjust the output current. The first input terminal of the control circuit is connected to the first output terminal of the first output control circuit, and is used to receive voltage / current sampling feedback signals from the first output control circuit to form closed-loop control; the second input terminal of the control circuit is connected to the first output terminal of the second output control circuit, and is used to receive voltage / current sampling feedback signals from the second output control circuit to form closed-loop control.

2. The dual-channel independent control output constant current charging device for the PCC box according to claim 1, characterized in that, The first output terminal of the boost output circuit is connected to the second input terminal of the first output control circuit, and is used to provide the boosted operating voltage to the first output control circuit. The second output terminal of the boost output circuit is connected to the second input terminal of the second output control circuit, and is used to provide the boosted operating voltage to the second output control circuit.

3. The dual-channel independent control output constant current charging device for the PCC box according to claim 1, characterized in that, The dual-channel independent control output constant current charging device also includes a first charging management circuit, a second charging management circuit, a first battery cell, and a second battery cell. The second output terminal of the first output control circuit is connected to the input terminal of the first charging management circuit, and is used to output the first constant current charging power supply to the first charging management circuit. The second output terminal of the second output control circuit is connected to the input terminal of the second charging management circuit, and is used to output the second constant current charging power supply to the second charging management circuit. The output terminal of the first charging management circuit is connected to the input terminal of the first battery cell to provide a stable and safe charging current for the first battery cell. The output terminal of the second charging management circuit is connected to the input terminal of the second battery cell to provide a stable and safe charging current for the second battery cell.

4. The dual-channel independent control output constant current charging device for the PCC box according to claim 3, characterized in that, The control circuit includes a main control chip MCU, and the first output control circuit includes a detection resistor R46, an NPN transistor Q4, and a field-effect transistor Q5.

5. The dual-channel independent control output constant current charging device for the PCC box according to claim 4, characterized in that, One end of the detection resistor R46 is connected to the VCC_BAT port of the first charging management circuit to provide a detection voltage when the first cell is inserted, and to maintain a high level when the first cell is not inserted.

6. The dual-channel independent control output constant current charging device for the PCC box according to claim 4, characterized in that, The NPN transistor Q4 is connected to pin 1 of the main control chip MCU via a series resistor R39. This connection is used to receive the PWM signal from the main control chip MCU and control the NPN transistor Q4 to turn on / off.

7. The dual-channel independent control output constant current charging device for the PCC box according to claim 4, characterized in that, Pin 3 of the NPN transistor Q4 is connected to pin 1 of the gate terminal of the field-effect transistor Q5. When the NPN transistor Q4 is turned on, it pulls the gate level of the field-effect transistor Q5 low, thereby controlling the turn-on and turn-off of the field-effect transistor Q5.

8. The dual-channel independent control output constant current charging device for the PCC box according to claim 4, characterized in that, Pin 2 of the S terminal of the field-effect transistor Q5 is connected to the 5V_OUT port of the boost output circuit to receive the boosted operating voltage; pin 3 of the D terminal of the field-effect transistor Q5 is connected in series with resistor R41 and then connected to the RLL1_ADC_P1_5 pin of the main control chip MCU to feed back the detected voltage status to the main control chip MCU to detect whether the first cell is inserted.

9. The dual-channel independent control output constant current charging device for the PCC box according to claim 4, characterized in that, The first output control circuit further includes a voltage divider resistor R47 and a current sampling resistor R30. One end of the voltage divider resistor R47 is connected to the negative terminal P1- of the first battery cell and is used to sample the output voltage. The other end of the voltage divider resistor R47 is connected to the RLH1_ADC_P1_2 pin of the main control chip MCU and is used to feed back the sampled voltage signal to the main control chip MCU to monitor the charging status.

10. The dual-channel independent control output constant current charging device for the PCC box according to claim 1, characterized in that, The second output control circuit includes a sensing resistor R36, an NPN transistor Q1, and a field-effect transistor Q2.

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