Power management circuit for online monitoring photovoltaic lithium battery of power transmission line lightning arrester

Abstract

The utility model relates to the technical field of management circuits, in particular to a power management circuit for monitoring a photovoltaic lithium battery on line for a power transmission line lightning arrester. The power management circuit comprises a photovoltaic input protection circuit, a sampling circuit, a charging management module, a battery pack and a photovoltaic battery switching circuit, the photovoltaic panel J1 is connected with the photovoltaic input protection circuit; the output end of the photovoltaic input protection circuit is connected to the sampling circuit; the charging management module is connected with the battery pack for charging; charging signals of the sampling circuit and the battery pack are sent to the photovoltaic battery switching circuit together; the photovoltaic cell switching circuit selects a photovoltaic panel or a cell pack to supply power to a load according to preset parameters; the photovoltaic cell switching circuit provides a state signal and inputs the state signal to the MCU. According to the utility model, the current and voltage of the photovoltaic panel are monitored in real time, the photovoltaic panel provides a power supply to supply power to the monitoring equipment after the photovoltaic input reaches a certain threshold value, the health state of the health equipment is monitored in real time, and the reliable operation of the monitoring equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of management circuits, in particular to a power management circuit for online monitoring of photovoltaic lithium batteries of a transmission line lightning arrester. Background Art

[0002] The lightning arresters and related monitoring devices on transmission lines are installed at a relatively high position. Therefore, how to provide stable power supply for them has become an important issue for equipment operation; in the prior art, lithium batteries are generally used for power supply, but the capacity of lithium batteries is limited. When the battery power is low, it can only be replaced manually, which is time-consuming and laborious.

[0003] In the prior art, there is also a combined power supply method of a photovoltaic panel and a lithium battery to solve the power supply problem. However, due to the defects of the power management circuit, the power consumption of the charging circuit is too large, and the power supply is unstable, resulting in the shutdown of the equipment during operation. Therefore, this application provides a power management circuit to solve the power supply problem of low-power monitoring devices. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems in the background art, and propose a power management circuit for online monitoring of photovoltaic lithium batteries of a transmission line lightning arrester, which can monitor the current and voltage of the photovoltaic panel in real time. After the input of the photovoltaic reaches a certain threshold, the photovoltaic panel provides power to supply the monitoring device, and monitors the voltage of the battery and the photovoltaic panel, and the output current of the photovoltaic panel, and the health status of the real-time health device, so as to improve the reliable operation of the monitoring device.

[0005] The technical solution of the utility model, a power management circuit for online monitoring of photovoltaic lithium batteries of a transmission line lightning arrester, includes a photovoltaic input protection circuit, a sampling circuit, a charging management module, a battery pack, a voltage acquisition circuit, a photovoltaic battery switching circuit and an MCU;

[0006] The photovoltaic panel J1 is connected to the photovoltaic input protection circuit, and the photovoltaic input protection circuit provides surge protection for the photovoltaic panel J1;

[0007] The output end of the photovoltaic input protection circuit is connected to the sampling circuit, and the sampling circuit collects the input current of the photovoltaic panel J1 and sends the collected data to the charging management module;

[0008] The charging management module is connected to the battery pack, and controls the battery pack to be charged through the output current of the photovoltaic panel J1;

[0009] The charging signals of the sampling circuit and the battery pack are sent into the photovoltaic battery switching circuit (VIN interface of U2) together; the photovoltaic battery switching circuit selects the photovoltaic panel or the battery pack to supply power to the load according to the preset parameters;

[0010] The voltage acquisition circuit is used to acquire the voltage of the battery pack, and the acquired signal is sent to the MCU. The MCU monitors the battery voltage in real time to grasp the working state of the battery and the remaining battery voltage.

[0011] The photovoltaic cell switching circuit provides a status signal input to the MCU. The MCU can determine whether the power supply is the battery or the photovoltaic panel according to the status signal. Among them, the high and low states of the STAT signal are determined by the power supply source: when the battery supplies power, STAT outputs a high level, and when the photovoltaic panel supplies power, STAT outputs a low level. This signal is directly connected to the MCU. Therefore, it can be known whether the power supply is the battery or the photovoltaic panel through the high and low levels.

[0012] Preferably, the photovoltaic input protection circuit includes a gas discharge tube G1, a resistor R3, a TVS diode D1, and a Schottky diode D3;

[0013] Both ends of the gas discharge tube G1 are respectively connected to the output ends of the photovoltaic panel J1, and the middle pole of the gas discharge tube G1 is connected to the ground;

[0014] The resistor R3 is a decoupling resistor, and its two ends are respectively connected to the gas discharge tube G1 and the TVS diode D1; the other end of the TVS diode D1 is grounded;

[0015] The Schottky diode D3 is connected between one end of the TVS diode D1 and the sampling resistor to prevent the current in the circuit from flowing back into the photovoltaic panel;

[0016] The gas discharge tube G1 conducts first, and then the TVS diode D1 conducts, clamping the overvoltage at a lower level to protect the subsequent circuit.

[0017] Preferably, the sampling circuit includes a sampling resistor R4, a resistor R8, a resistor R9, a clamping diode D4, a clamping diode D5, and a current sampling chip U3;

[0018] The sampling resistor R4 detects the input current, that is, the output current of the photovoltaic panel J1;

[0019] The 3rd pin of the current sampling chip U3 is connected to one end of the sampling resistor R4 through the resistor R8, and the 4th pin of the current sampling chip U3 is connected to the other end of the sampling resistor R4 through the resistor R9;

[0020] The clamping diode D4 and the clamping diode D5 are reverse to each other and are connected in parallel on the 3rd and 4th pins of the current sampling chip U3 to limit the voltage at the input end;

[0021] The 2nd pin of the current sampling chip U3 is grounded, and the 5th pin is connected to 3.3V power supply and then connected to GND through the capacitor C3;

[0022] The 1st pin of the current sampling chip U3 is connected to the MCU, and the MCU performs ADC operation to obtain the current passing through here.

[0023] Preferably, the current sampling chip U3 is INA180A4.

[0024] Preferably, the charging management module includes capacitor C2, CN3082, resistors R1, R2, R6, R7, R10, R11;

[0025] One end of capacitor C2 is connected to the vin pin of chip CN3082, and the other end is connected to GND; Capacitor C2 serves as the filtering capacitor of CN3082 to maintain the stability of the input signal;

[0026] The 4th pin of CN3082 is connected to the output end of sampling resistor R4, the 7th pin is connected to GND, the 6th pin is connected to GND after being in series with resistors R6 and R10, the 2nd pin is connected to GND after passing through resistor R10, the 5th pin is connected to the photovoltaic cell switching circuit, the 1st pin is connected to the battery pack, and the 8th pin is connected to GND after passing through resistor R11;

[0027] The input end of resistor R1 is connected to the 4th pin of CN3082, one of the output ends is connected to the 1st pin of CN3082, and the other output end is connected to resistor R2 and then to GND;

[0028] The input end of resistor R7 is connected to the 5th pin of CN3082, and the output end is connected to resistor R11 and then to GND;

[0029] Resistor R10 is used to set the charging current magnitude of the battery;

[0030] Resistor R6 is used to set the maintaining charging current;

[0031] Preferably, the MCU is STM32L071C8T6; The 2nd pin of the MCU is connected to the 1st pin of the current sampling chip U3; The 45th pin is ADC_BAT_Pow, which is used to control the switch of the acquisition circuit; The 46th pin is ADC_BAT, which is the pin with ADC function on the MCU.

[0032] Preferably, the positive pole of the battery pack is respectively connected to the 5th pin of CN3082, the 1st pin of the photovoltaic switching chip U2, and the 3rd pin of PMOS transistor Q1; The negative pole of the battery is connected to GND;

[0033] Preferably, the battery pack is provided with a temperature detection signal line, which is connected to the 1st pin of CN3082.

[0034] Preferably, the voltage acquisition circuit includes PMOS transistor Q2, NPN transistor Q3, resistors R14, R15, R16, R17, R18;

[0035] The source electrode of PMOS transistor Q2 is connected to the VBAT line of the battery pack, the gate electrode is connected to the collector of NPN transistor Q3 after being in series with resistor R16, and the drain electrode is connected to pin 46 of the MCU after being in series with resistor R17;

[0036] The base electrode of NPN transistor Q3 is connected to pin 45 of the MCU after being in series with resistor R14, and the emitter electrode is grounded;

[0037] One end of resistor R15 is connected to the VBAT line, and the other end is connected to the collector of NPN transistor Q3; one end of resistor R18 is connected to pin 46 of the MCU, and the other end is grounded;

[0038] PMOS transistor Q2, NPN transistor Q3, resistors R14, R15, and R16 form a switching circuit;

[0039] When ADC_BAT_Pow outputs a high level, Q2 conducts, and VBAT1 and VBAT will be connected; when ADC_BAT_Pow outputs a low level, Q2 does not conduct, and VBAT1 and VBAT will not be connected.

[0040] After adopting this voltage acquisition circuit, the power consumption of the device can be reduced, and additional power consumption brought by the secondary circuit can be avoided. The cooperation of resistors R17 and R18 determines the electrical measurement range of the battery voltage. The sum of the resistance values of R17 and R18 is less than 30K, which can not only maintain the accuracy but also meet the requirements of the ADC input impedance.

[0041] Preferably, the photovoltaic cell switching circuit includes a photovoltaic switching chip U2, resistors R5, R12, R13, a diode D2, a PMOS transistor Q1, and a capacitor C1;

[0042] Pin 2 of PMOS transistor Q1 is connected to one end of diode D2, and pin 1 is connected to pin 5 of photovoltaic switching chip U2;

[0043] The other end of diode D2 is connected to GND after being in series with resistors R12 and R12;

[0044] One end of capacitor C1 is connected to the Vout output, and the other end is connected to GND;

[0045] Both pin 2 and pin 3 of photovoltaic switching chip U2 are connected to GND, pin 6 is connected to GND after being in series with resistor R13, and pin 4 outputs a status signal;

[0046] One end of resistor R5 is connected to the 3.3V power supply, and the other end outputs a status signal together with pin 4 of photovoltaic switching chip U2.

[0047] Compared with the prior art, the utility model has the following beneficial technical effects:

[0048] This utility model charges the battery pack by using a photovoltaic panel, and monitors the current and voltage output by the photovoltaic in real time. After the input of the photovoltaic reaches a certain threshold, the photovoltaic panel provides power to supply the monitoring device. With a stable power supply, the leakage current and the number of operations of the lightning arrester are monitored in real time, and the voltages of the battery and the photovoltaic panel, as well as the output current of the photovoltaic panel, are monitored. The health status of the health device is monitored in real time, improving the reliable operation of the monitoring device. Description of the Drawings

[0049] Figure 1 It is the circuit diagram of the embodiment of this utility model;

[0050] Figure 2 It is the circuit diagram of the voltage acquisition circuit in the embodiment of this utility model;

[0051] Figure 3 It is the circuit diagram of the MCU in the embodiment of this utility model. Detailed Embodiment

[0052] As Figures 1-3 shown, a power management circuit for on-line monitoring of a lightning arrester for a transmission line using photovoltaic lithium batteries proposed by this utility model includes a photovoltaic input protection circuit, a sampling circuit, a charging management module, a battery pack, a voltage acquisition circuit, a photovoltaic cell switching circuit, and an MCU;

[0053] The photovoltaic panel J1 is connected to the photovoltaic input protection circuit, and the photovoltaic input protection circuit provides surge protection for the photovoltaic panel J1;

[0054] The photovoltaic input protection circuit includes a gas discharge tube G1, a resistor R3, a TVS diode D1, and a Schottky diode D3;

[0055] Both ends of the gas discharge tube G1 are respectively connected to the output ends of the photovoltaic panel J1, and the middle pole of the gas discharge tube G1 is connected to the ground; the resistor R3 is a decoupling resistor, and its two ends are respectively connected to the gas discharge tube G1 and the TVS diode D1; the other end of the TVS diode D1 is grounded; the Schottky diode D3 is connected between one end of the TVS diode D1 and the sampling resistor to prevent the current in the circuit from flowing back into the photovoltaic panel reversely; the gas discharge tube G1 conducts first, and then the TVS diode D1 conducts, clamping the overvoltage at a lower level to protect the subsequent circuit;

[0056] The output end of the photovoltaic input protection circuit is connected to the sampling circuit, and the sampling circuit collects the input current of the photovoltaic panel J1 and sends the collected data to the charging management module;

[0057] The output end of the photovoltaic input protection circuit is connected to the sampling circuit, and the sampling circuit collects the input current of the photovoltaic panel J1 and sends the collected data to the charging management module;

[0058] The sampling circuit includes a sampling resistor R4, a resistor R8, a resistor R9, a clamping diode D4, a clamping diode D5, and a current sampling chip U3;

[0059] The sampling resistor R4 detects the input current, that is, the output current of the photovoltaic panel J1;

[0060] The 3rd pin of the current sampling chip U3 is connected to one end of the sampling resistor R4 through the resistor R8, and the 4th pin of the current sampling chip U3 is connected to the other end of the sampling resistor R4 through the resistor R9;

[0061] The clamping diode D4 and the clamping diode D5 are reverse to each other and are connected in parallel on the 3rd and 4th pins of the current sampling chip U3 to limit the voltage at the input end;

[0062] The 2nd pin of the current sampling chip U3 is grounded, and the 5th pin is connected to 3.3V power supply and then connected to GND through the capacitor C3;

[0063] The 1st pin of the current sampling chip U3 is connected to the MCU, and the ADC of the MCU calculates the current passing through here; the current sampling chip U3 is INA180A4.

[0064] The charging management module is connected to the battery pack and controls the battery pack to be charged through the output current of the photovoltaic panel J1;

[0065] The charging management module is connected to the battery pack and controls the battery pack to be charged through the output current of the photovoltaic panel J1;

[0066] The charging management module includes a capacitor C2, U1 (CN3082), resistors R1, R2, R6, R7, R10, R11;

[0067] One end of the capacitor C2 is connected to the vin pin of the chip CN3082, and the other end is connected to GND; the capacitor C2 serves as the filtering capacitor of CN3082 to maintain the stability of the input signal;

[0068] The 4th pin of CN3082 is connected to the output end of the sampling resistor R4, the 7th pin is grounded, the 6th pin is connected to GND after being connected in series with resistors R6 and R10, the 2nd pin is connected to GND after passing through the resistor R10, the 5th pin is connected to the photovoltaic cell switching circuit, the 1st pin is connected to the battery pack, and the 8th pin is connected to GND after passing through the resistor R11;

[0069] The input end of the resistor R1 is connected to the 4th pin of CN3082, and one of the output ends is connected to the 1st pin of CN3082, and the other output end is connected to GND after being connected to the resistor R2;

[0070] The input end of the resistor R7 is connected to the 5th pin of CN3082, and the output end is connected to GND after being connected to the resistor R11;

[0071] The resistor R10 is used to set the magnitude of the charging current of the battery; the resistor R6 is used to set the maintaining charging current to ensure that the battery can be fully charged; among them, U1 is CN3082.

[0072] The positive electrode of the battery pack is respectively connected to the 5th pin of CN3082, the 1st pin of the photovoltaic switching chip U2, and the 3rd pin of the PMOS transistor Q1; the negative electrode of the battery is connected to GND;

[0073] The battery pack is provided with a temperature detection signal line, which is connected to the 1st pin of CN3082 and is used to feedback the temperature information of the battery pack.

[0074] The temperature signal detection line of the battery pack is connected to U1, CN3082. The threshold value for temperature judgment can be set through the resistance values of R1 and R2. When the temperature is greater than the set threshold value, CN3082 will close the battery charging channel to better protect the battery.

[0075] The sampling circuit and the charging signal of the battery pack are sent into the photovoltaic cell switching circuit (the VIN interface of U2) together; the photovoltaic cell switching circuit selects the photovoltaic panel or the battery pack as the load to supply power according to the preset parameters;

[0076] The voltage acquisition circuit is used to acquire the voltage of the battery pack, and the acquired signal is transmitted to the MCU to control the switch of the acquisition circuit through the MCU; the voltage acquisition circuit includes the PMOS transistor Q2, the NPN transistor Q3, and the resistors R14, R15, R16, R17, R18;

[0077] The source electrode of the PMOS transistor Q2 is connected to the VBAT line of the battery pack, the gate electrode is connected in series with the resistor R16 and then accesses the collector of the NPN transistor Q3, and the drain electrode is connected in series with the resistor R17 and then connected to the 46th pin of the MCU;

[0078] The base electrode of the NPN transistor Q3 is connected in series with the resistor R14 and then connected to the 45th pin of the MCU, and the emitter electrode is grounded;

[0079] One end of the resistor R15 is connected to the VBAT line, and the other end accesses the collector of the NPN transistor Q3; one end of the resistor R18 is connected to the 46th pin of the MCU, and the other end is grounded;

[0080] The PMOS transistor Q2, the NPN transistor Q3, and the resistors R14, R15, R16 form a switching circuit;

[0081] When ADC_BAT_Pow outputs a high level, Q2 conducts, and VBAT1 and VBAT will be connected; when ADC_BAT_Pow outputs a low level, Q2 does not conduct, and VBAT1 and VBAT will not be connected.

[0082] After adopting this voltage acquisition circuit, the power consumption of the device can be reduced, and additional power consumption caused by the secondary circuit can be avoided. The cooperation of resistors R17 and R18 determines the electrical measurement range of the battery voltage. The sum of the resistances of R17 and R18 is less than 30K, which can not only maintain the accuracy but also meet the requirements of the ADC input impedance.

[0083] The photovoltaic cell switching circuit provides a status signal to be input into the MCU. The MCU can determine whether the power supply is the battery or the photovoltaic panel according to the status signal. Among them, the high and low states of the STAT signal are determined by the power supply source: when the battery supplies power, STAT outputs a high level; when the photovoltaic panel supplies power, STAT outputs a low level. This signal is directly connected to the MCU. Therefore, it can be known whether the power supply is the battery or the photovoltaic panel through the high and low levels.

[0084] The photovoltaic cell switching circuit includes a photovoltaic switching chip U2, resistors R5, R12, R13, a diode D2, a PMOS transistor Q1, and a capacitor C1;

[0085] The pin 2 of the PMOS transistor Q1 is connected to one end of the diode D2, and the pin 1 is connected to the pin 5 of the photovoltaic switching chip U2;

[0086] The other end of the diode D2 is connected to GND after being serially connected with resistors R12 and R12;

[0087] One end of the capacitor C1 is connected to the Vout output, and the other end is connected to GND;

[0088] The pin 2 and pin 3 of the photovoltaic switching chip U2 are both connected to GND. The pin 6 is connected to GND after being serially connected with the resistor R13, and the pin 4 outputs the status signal.

[0089] One end of the resistor R5 is connected to the 3.3V power supply, and the other end outputs the status signal together with the pin 4 of the photovoltaic switching chip U2.

[0090] The photovoltaic cell switching circuit provides a status signal to be input into the MCU of the charging management module. The MCU can determine whether the power supply is the battery or the photovoltaic panel according to the status signal.

[0091] In an optional embodiment, as Figure 1 shown, R10 is 10kΩ and R6 is 120Ω; when the photovoltaic input voltage is greater than or equal to the operating voltage required by the VDD of CN3082 and the battery has not reached the cut-off charging voltage, the photovoltaic input voltage passes through the SUN in the circuit diagram after passing through the protection circuit and enters CN3082; CN3082 charges the battery according to the configuration of the peripheral resistors. At this time, the photovoltaic input voltage SUN also enters the power supply switching circuit, the PMOS transistor is not turned on, and the photovoltaic panel supplies power to the load through D2;

[0092] The voltage divided by R12 / R13 will enable the PV panel to supply power to the load only when it is greater than the battery voltage by 3.5 V;

[0093] When the input voltage of the PV panel < V BAT + 0.04 V, CN3082 stops working, and at this time the battery supplies power to the load;

[0094] The input current sampling module is responsible for collecting the current input to the backend, monitoring the output current of the PV panel, and delivering it to the ADC sampling terminal of the MCU through charge_I of the sampling chip U3.

[0095] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those skilled in the art to which it pertains.

Claims

1. A power management circuit for online monitoring of photovoltaic lithium batteries by lightning arresters of power transmission lines, characterized in that: Including photovoltaic input protection circuit, sampling circuit, charging management module, battery pack, voltage collection circuit, photovoltaic battery switching circuit and MCU; The photovoltaic panel J1 is connected to the photovoltaic input protection circuit, and the photovoltaic input protection circuit provides surge protection for the photovoltaic panel J1; The output end of the photovoltaic input protection circuit is connected to the sampling circuit, which collects the input current of the photovoltaic panel J1 and sends the collected data to the charging management module; The charging management module is connected to the battery pack and controls the battery pack to be charged through the output current of the photovoltaic panel J1; The sampling circuit and the charging signal of the battery pack are sent to the photovoltaic cell switching circuit together; the photovoltaic cell switching circuit selects the photovoltaic panel or the battery pack to power the load according to the preset parameters; The voltage acquisition circuit is used to collect the voltage of the battery pack, and the acquisition signal is transmitted to the MCU, and the switch of the acquisition circuit is controlled by the MCU; The photovoltaic cell switching circuit provides a status signal input to the MCU, and the MCU can determine whether the power supply is a battery or a photovoltaic panel based on the status signal.

2. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 1, characterized in that: The photovoltaic input protection circuit includes a gas discharge tube G1, a resistor R3, a TVS diode D1 and a Schottky diode D3; The two ends of the gas discharge tube G1 are respectively connected to the two output ends of the photovoltaic panel J1, and the middle pole of the gas discharge tube G1 is connected to the ground; The resistor R3 is a decoupling resistor, and its two ends are connected to the gas discharge tube G1 and the TVS diode D1 respectively; the other end of the TVS diode D1 is grounded; The Schottky diode D3 is connected between one end of the TVS diode D1 and the sampling resistor to prevent the current in the circuit from flowing back into the photovoltaic panel; The gas discharge tube G1 is turned on first, and then the TVS diode D1 is turned on, clamping the overvoltage at a lower level to protect the back-end circuit.

3. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 1, characterized in that: The sampling circuit includes a sampling resistor R4, a resistor R8, a resistor R9, a clamping diode D4, a clamping diode D5 and a current sampling chip U3; The sampling resistor R4 detects the input current, that is, the output current of the photovoltaic panel J1; Pin 3 of the current sampling chip U3 is connected to one end of the sampling resistor R4 through a resistor R8, and pin 4 of the current sampling chip U3 is connected to the other end of the sampling resistor R4 through a resistor R9; The clamping diode D4 and the clamping diode D5 are opposite to each other and are connected in parallel to the 3rd and 4th pins of the current sampling chip U3 to limit the voltage at the input end; Pin 2 of the current sampling chip U3 is grounded, and pin 5 is connected to 3.3V power supply and then to GND through capacitor C3; Pin 1 of the current sampling chip U3 is connected to the MCU, and the ADC of the MCU calculates the current passing there.

4. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 3, characterized in that: The current sampling chip U3 is INA180A4.

5. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 3 or 4, characterized in that: The charging management module includes capacitor C2, chip CN3082, resistors R1, R2, R6, R7, R10, and R11; One end of capacitor C2 is connected to the vin pin of chip CN3082, and the other end is connected to GND; capacitor C2 serves as a filter capacitor of CN3082 to maintain the stability of the input signal; Pin 4 of CN3082 is connected to the output end of sampling resistor R4, pin 7 is connected to GND, pin 6 is connected to GND after connecting resistors R6 and R10 in series, pin 2 is connected to GND after passing through resistor R10, pin 5 is connected to the photovoltaic cell switching circuit, pin 1 is connected to the battery pack, and pin 8 is connected to GND after passing through resistor R11; The input end of resistor R1 is connected to pin 4 of CN3082, one of the output ends is connected to pin 1 of CN3082, and the other output end is connected to resistor R2 and then to GND; The input end of resistor R7 is connected to pin 5 of CN3082, and the output end is connected to resistor R11 and then to GND; Resistor R10 is used to set the battery charging current; Resistor R6 is used to set the maintenance charge current.

6. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line lightning arresters according to claim 5, characterized in that: The MCU is STM32L071C8T6; pin 2 of the MCU is connected to pin 1 of the current sampling chip U3; pin 45 is ADC_BAT_Pow, which is used to control the switch of the acquisition circuit; pin 46 is ADC_BAT, which is a pin with ADC function on the MCU.

7. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 1, characterized in that: The positive pole of the battery pack is connected to pin 5 of CN3082, pin 1 of the photovoltaic switching chip U2, and pin 3 of the PMOS tube Q1; the negative pole of the battery is connected to GND.

8. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 7, characterized in that: The battery pack is provided with a temperature detection signal line, which is connected to pin 1 of CN3082.

9. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 6, characterized in that: The voltage acquisition circuit includes a PMOS tube Q2, an NPN transistor Q3, and resistors R14, R15, R16, R17, and R18; The source of the PMOS tube Q2 is connected to the VBAT line of the battery pack, the gate is connected in series with the resistor R16 and then connected to the collector of the NPN transistor Q3, and the drain is connected in series with the resistor R17 and then connected to the 46th pin of the MCU; The base of the NPN transistor Q3 is connected in series with the resistor R14 and then connected to the MCU's pin 45, and the emitter is grounded; One end of the resistor R15 is connected to the VBAT line, and the other end is connected to the collector of the NPN transistor Q3; one end of the resistor R18 is connected to the 46th pin of the MCU, and the other end is grounded; PMOS tube Q2, NPN transistor Q3, resistors R14, R15, R16, form a switch circuit; When ADC_BAT_Pow outputs a high level, Q2 is turned on, VBAT1 and VBAT are connected; when ADC_BAT_Pow outputs a low level, Q2 is not turned on, and VBAT1 and VBAT are not connected.

10. A power management circuit for online monitoring of photovoltaic lithium batteries for transmission line arresters according to claim 1, characterized in that: The photovoltaic cell switching circuit includes a photovoltaic switching chip U2, resistors R5, R12, R13, a diode D2, a PMOS tube Q1 and a capacitor C1; Pin 2 of the PMOS tube Q1 is connected to one end of the diode D2, and pin 1 is connected to pin 5 of the photovoltaic switching chip U2; The other end of the diode D2 is connected in series with a resistor R12, and R12 is then connected to GND; One end of capacitor C1 is connected to Vout output, and the other end is connected to GND; Pins 2 and 3 of the photovoltaic switching chip U2 are both connected to GND, pin 6 is connected in series with resistor R13 and then connected to GND, and pin 4 outputs a status signal; One end of the resistor R5 is connected to a 3.3V power supply, and the other end thereof outputs a status signal together with pin 4 of the photovoltaic switching chip U2.

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