Battery charging and discharging control circuit for outdoor mobile power supply

Abstract

The utility model discloses a battery charge and discharge control circuit for an outdoor mobile power supply, which comprises a charger switch control circuit, a main control circuit and a battery switch control circuit, and is characterized in that the main control circuit controls the working states of the charger switch control circuit and the battery switch control circuit through CHA-SW signals and BAT-SW signals; when the battery needs to be charged by the charger, the charger CHA is connected to the common line inverter INV through the charger switch control circuit, and then the battery BAT is charged through the battery switch control circuit, the battery BAT is fast in response action and stable in work, the battery can be protected, the service life of the battery BAT can be prolonged, and the service life of the battery BAT can be prolonged. In addition, it can be ensured that the CHA end has no power before the charger is connected to the circuit, the charger charges the battery after the relay is closed, and the reverse electromotive force is discharged at the moment that the battery is powered off, so that the MOS tube is prevented from being broken down and damaged, and the function of protecting the circuit is achieved.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a control circuit for battery charging and discharging in outdoor portable power supplies. Background Technology

[0002] Currently, existing portable power banks all use batteries that power the internal system circuitry without software control. This results in high power consumption and excessive energy usage. Therefore, there is an urgent need to develop a battery charging and discharging control circuit for portable power banks to solve these technical problems.

[0003] In view of the above, this utility model is hereby proposed. Utility Model Content

[0004] The purpose of this invention is to provide a control circuit for charging and discharging batteries in outdoor portable power banks. This circuit features fast response and stable operation, protecting the battery, extending its lifespan, ensuring that the CHA terminal is de-energized before the charger is connected to the circuit, and that the charger is charging the battery after the relay is engaged. Furthermore, it provides a discharge path for the reverse electromotive force generated by the relay coil at the moment of battery power failure, discharging the reverse electromotive force to prevent damage to the MOSFET, thus protecting the circuit. This invention has broad application prospects and is conducive to widespread application.

[0005] To achieve the above objectives, this utility model provides a control circuit for battery charging and discharging in an outdoor portable power supply, including a charger switch control circuit, a main control circuit, and a battery switch control circuit. The main control circuit controls the operating states of the charger switch control circuit and the battery switch control circuit through CHA-SW and BAT-SW signals. When the inverter is working normally, the battery BAT discharges through the battery switch control circuit to supply power to the inverter INV. When the battery needs to be charged by the charger, the charger CHA is connected to the common line inverter INV through the charger switch control circuit, and then charges the battery BAT through the battery switch control circuit.

[0006] Preferably, the battery switch control circuit includes a battery BAT, an inverter input power supply INV, a main control signal BAT-SW, a relay K1, a diode D1, a field-effect transistor Q1, and resistors R1 and R2. INV is connected to pin 87 of K1, BAT is connected to pins 30 and 85 of K1 and connected to pin 86 of K1 and pin 3 of Q1 through D1, BAT-SW is connected to pin 1 of Q1 and GND through R1 and R2, and pin 2 of Q1 is connected to GND. The main control circuit controls the conduction and cutoff of Q1 by controlling the high and low levels of the BAT-SW signal. When the BAT-SW signal is high, Q1 is turned on, current flows through the internal coil of K1, the internal contact switch of K1 is closed, BAT is connected to INV, and INV has voltage. When the BAT-SW signal is low, Q1 is cut off, no current flows through the internal coil of K1, the internal contact switch of K1 is open, and INV has no voltage.

[0007] Preferably, the charger switch control circuit includes a charger CHA, an inverter input power supply INV, a main control signal CHA-SW, a relay K2, diodes D2 and D3, a field-effect transistor Q2, and resistors R3 and R4. INV is connected to pin 87 of K2, CHA is connected to pin 30 of K2 through D3, BAT is connected to pin 85 of K2 and to pin 86 of K2 and pin 3 of Q2 through D2, CHA-SW is connected to pin 1 of Q2 and to GND through R3 and R4, and pin 2 of Q2 is connected to GND. The main control circuit controls the conduction and cutoff of Q2 by controlling the high and low levels of the CHA-SW signal. When the CHA-SW signal is high, Q2 is turned on, current flows through the coil inside K2, the contact switch inside K2 is closed, CHA is connected to INV, and INV has voltage. When the CHA-SW signal is low, Q2 is cut off, no current flows through the coil inside K2, the contact switch inside K2 is open, and INV has no voltage.

[0008] Preferably, the battery BAT is a ternary lithium battery with a nominal voltage of 25.9V, a nominal capacity of 120Ah, and a standard charge / discharge current of 24A.

[0009] Preferably, the inverter input power supply INV is a unidirectional inverter with an input voltage of 20V-30V, an output voltage of 220V, a rated power of 1000W, a peak power of 2000W, an output frequency of 50HZ, and an output waveform of a pure sine wave.

[0010] Preferably, the charger CHA is a lithium battery charger with a charging voltage of 29.2V, a charging current of 20A, and overvoltage, undervoltage, and overcurrent protection functions.

[0011] Preferably, the resistance values ​​of resistors R1 and R3 are 1K, and the resistance values ​​of resistors R2 and R4 are 100K.

[0012] Preferably, the field-effect transistors Q1 and Q2 are of model SSM3K2615R,LF.

[0013] Preferably, diodes D1 and D2 are of type SS36, and diode D3 is of type SB2080L.

[0014] Preferably, the relays K1 and K2 are of model number JD2912-1H-24VDC.

[0015] The present invention provides a control circuit for battery charging and discharging in outdoor portable power supplies, which has the following beneficial effects.

[0016] 1. This utility model controls the on / off state of an electromagnetic relay with a specification of 24V 80A through a main control small signal, thereby controlling the charging and discharging state of the battery. The circuit has a fast response and more stable operation, which can effectively protect the battery and extend its service life.

[0017] 2. This utility model utilizes the unidirectional conductivity of a diode to control the direction of the signal current from CHA to INV, and not from INV to CHA, to ensure that the CHA terminal is de-energized before the charger is connected to the circuit, and that the charger is charging the battery after the relay is energized.

[0018] 3. This utility model uses a diode connected in reverse parallel across the coil ends of pins 85 and 86 of relay K2. This provides a discharge path for the reverse electromotive force generated by the internal coil of the relay at the moment of battery power failure, dissipating the reverse electromotive force and preventing the MOSFET from being damaged by breakdown, thereby playing a role in protecting the circuit. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall principle of a control battery charging and discharging circuit for an outdoor portable power source provided by this utility model;

[0020] Figure 2 This is a circuit diagram for the battery switch control.

[0021] Figure 3 This is the circuit diagram for the charger switch control.

[0022] Figure 4 This is a flowchart of the battery switch control process.

[0023] Figure 5 This is a flowchart of the charger switch control. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments and accompanying drawings to help understand the content of the present invention.

[0025] like Figure 1The diagram shown is a schematic representation of the overall principle of a battery charging and discharging control circuit for an outdoor portable power bank provided by this utility model. This circuit includes a charger switch control circuit, a main control circuit, and a battery switch control circuit. The main control circuit controls the operating states of the charger switch control circuit and the battery switch control circuit via CHA-SW and BAT-SW signals. When the inverter is working normally, the battery BAT discharges through the battery switch control circuit to supply power to the inverter INV. When the battery needs charging, the charger CHA is connected to the common line inverter INV through the charger switch control circuit, and then charges the battery BAT through the battery switch control circuit.

[0026] like Figure 2 The diagram shows the battery switch control circuit. The battery switch control circuit includes a battery (BAT), an inverter input power supply (INV), a main control signal (BAT-SW), a relay (K1), a diode (D1), a field-effect transistor (FET) (Q1), and resistors (R1 and R2). INV is connected to pin 87 of K1. BAT is connected to pins 30 and 85 of K1 and, through D1, to pin 86 of K1 and pin 3 of Q1. BAT-SW is connected to pin 1 of Q1 and to GND through R1 and R2. Pin 2 of Q1 is connected to GND. The main control circuit controls the conduction and cutoff of Q1 by controlling the high and low levels of the BAT-SW signal. When the BAT-SW signal is high, Q1 conducts, current flows through the internal coil of K1, the internal contact switch of K1 is closed, BAT is connected to INV, and INV has voltage. When the BAT-SW signal is low, Q1 is cut off, no current flows through the internal coil of K1, the internal contact switch of K1 is open, and INV has no voltage.

[0027] like Figure 3 The diagram shows the charger switch control circuit. The charger switch control circuit includes a charger CHA, an inverter input power supply INV, a main control signal CHA-SW, a relay K2, diodes D2 and D3, a field-effect transistor Q2, and resistors R3 and R4. INV is connected to pin 87 of K2, CHA is connected to pin 30 of K2 via D3, BAT is connected to pin 85 of K2 and to pin 86 of K2 and pin 3 of Q2 via D2, CHA-SW is connected to pin 1 of Q2 and to GND via R3 and R4, and pin 2 of Q2 is connected to GND. The main control circuit controls the conduction and cutoff of Q2 by controlling the high and low levels of the CHA-SW signal. When the CHA-SW signal is high, Q2 conducts, current flows through the internal coil of K2, the internal contact switch of K2 is closed, CHA is connected to INV, and INV has voltage. When the CHA-SW signal is low, Q2 is cut off, no current flows through the internal coil of K2, the internal contact switch of K2 is open, and INV has no voltage.

[0028] The battery BAT is a ternary lithium battery with a nominal voltage of 25.9V, a nominal capacity of 120Ah, and a standard charge / discharge current of 24A. The inverter input power supply INV is a unidirectional inverter with an input voltage of 20V-30V, an output voltage of 220V, a rated power of 1000W, a peak power of 2000W, an output frequency of 50Hz, and an output waveform of pure sine wave. The charger CHA is a lithium battery charger with a charging voltage of 29.2V, a charging current of 20A, and overvoltage, undervoltage, and overcurrent protection functions. Resistors R1 and R3 have a resistance of 1KΩ, and resistors R2 and R4 have a resistance of 100KΩ. The MOSFETs Q1 and Q2 are model SSM3K2615R,LF. Diodes D1 and D2 are model SS36, and diode D3 is model SB2080L. The relays K1 and K2 are model number JD2912-1H-24VDC.

[0029] This invention is applied to outdoor mobile power supply circuits. The main control circuit controls the battery to supply power to the inverter. When the battery is depleted, the charger charges the battery.

[0030] like Figure 4 The diagram shown is a flowchart of the battery switch control process. The battery switch control process is as follows:

[0031] When the external AC button on the power bank is pressed, the power bank's AC output interface outputs AC220V voltage. Specifically, when the main control circuit detects the AC button being pressed, the main control signal BAT-SW outputs a high-level signal to control relay K1 to engage. The battery BAT discharges to the inverter INV. Since INV has voltage on BAT, the inverter has input voltage, and the inverter operates normally, outputting AC220V.

[0032] like Figure 5 The diagram shown is a flowchart of the charger switch control. The charger switch control flow is as follows:

[0033] Under normal operating conditions, the battery discharges normally, indicated by a high-level output from the main control circuit signal BAT-SW. If the system detects a low-voltage battery, it prompts that the charger CHA needs to charge the battery BAT. In this case, an external charger needs to be connected to the power bank. If the system detects a charger connection, the main control signal CHA-SW outputs a high level, controlling relay K2 to engage, resulting in a CHA output voltage on INV. The charger CHA then connects to BAT via the INV signal to charge the battery. If the system does not detect a charger connection, the main control signal CHA-SW outputs a low level, relay K2 disengages, and the system continues to prompt for a charger connection. The diode D3 in the charger switch control circuit is unidirectionally conductive, ensuring that the charger charges the battery when connected.

[0034] This invention features a fast response and stable operation. It not only protects the battery and extends its service life, but also ensures that the CHA terminal is de-energized before the charger is connected to the circuit, and that the charger is charging the battery after the relay is energized. Furthermore, it provides a discharge path for the reverse electromotive force generated by the internal coil of the relay at the moment the battery is de-energized, thus dissipating the reverse electromotive force and preventing the MOSFET from being damaged. This provides circuit protection and has broad application prospects, making it suitable for widespread application.

[0035] This article uses specific examples to illustrate the inventive concept in detail. The description of the above embodiments is only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that any obvious modifications, equivalent substitutions or other improvements made by those skilled in the art without departing from the inventive concept should be included within the protection scope of this utility model.

Claims

1. A control circuit for charging and discharging batteries in an outdoor portable power bank, characterized in that, It includes a charger switch control circuit, a main control circuit, and a battery switch control circuit. The main control circuit controls the operating state of the charger switch control circuit and the battery switch control circuit through the CHA-SW signal and the BAT-SW signal. When the inverter is working normally, the battery BAT discharges through the battery switch control circuit to supply power to the inverter INV. When the battery needs to be charged by the charger, the charger CHA is connected to the common line inverter INV through the charger switch control circuit, and then charges the battery BAT through the battery switch control circuit.

2. The control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 1, characterized in that, The battery switch control circuit includes a battery (BAT), an inverter input power supply (INV), a main control signal (BAT-SW), a relay (K1), a diode (D1), a field-effect transistor (Q1), and resistors (R1 and R2). INV is connected to pin 87 of K1, BAT is connected to pins 30 and 85 of K1 and is connected to pin 86 of K1 and pin 3 of Q1 through D1. BAT-SW is connected to pin 1 of Q1 and to GND through R1 and R2. Pin 2 of Q1 is connected to GND. The main control circuit controls the conduction and cutoff of Q1 by controlling the high and low levels of the BAT-SW signal. When the BAT-SW signal is high, Q1 is turned on, current flows through the internal coil of K1, the internal contact switch of K1 is closed, BAT is connected to INV, and INV has voltage. When the BAT-SW signal is low, Q1 is cut off, no current flows through the internal coil of K1, the internal contact switch of K1 is open, and INV has no voltage.

3. The control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 2, characterized in that, The charger switch control circuit includes a charger CHA, an inverter input power supply INV, a main control signal CHA-SW, a relay K2, diodes D2 and D3, a field-effect transistor Q2, and resistors R3 and R4. INV is connected to pin 87 of K2, CHA is connected to pin 30 of K2 via D3, BAT is connected to pin 85 of K2 and to pin 86 of K2 and pin 3 of Q2 via D2, CHA-SW is connected to pin 1 of Q2 and to GND via R3 and R4, and pin 2 of Q2 is connected to GND. The main control circuit controls the conduction and cutoff of Q2 by controlling the high and low levels of the CHA-SW signal. When the CHA-SW signal is high, Q2 is turned on, current flows through the internal coil of K2, the internal contact switch of K2 is closed, CHA is connected to INV, and INV has voltage. When the CHA-SW signal is low, Q2 is cut off, no current flows through the internal coil of K2, the internal contact switch of K2 is open, and INV has no voltage.

4. The control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 3, characterized in that, The battery BAT is a ternary lithium battery with a nominal voltage of 25.9V, a nominal capacity of 120Ah, and a standard charge / discharge current of 24A.

5. The control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 4, characterized in that, The inverter input power supply INV is a unidirectional inverter with an input voltage of 20V-30V, an output voltage of 220V, a rated power of 1000W, a peak power of 2000W, an output frequency of 50HZ, and an output waveform of pure sine wave.

6. The control battery charging and discharging circuit for an outdoor portable power supply according to claim 5, characterized in that, The charger CHA is a lithium battery charger with a charging voltage of 29.2V and a charging current of 20A. It has overvoltage, undervoltage, and overcurrent protection functions.

7. A control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 6, characterized in that, The resistance values ​​of resistors R1 and R3 are 1K, and the resistance values ​​of resistors R2 and R4 are 100K.

8. A control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 7, characterized in that, The field-effect transistors Q1 and Q2 are model SSM3K2615R,LF.

9. A control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 8, characterized in that, The diodes D1 and D2 are of type SS36, and the diode D3 is of type SB2080L.

10. A control circuit for charging and discharging a battery in an outdoor portable power supply according to claim 9, characterized in that, The relays K1 and K2 are model number JD2912-1H-24VDC.

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