过流保护电路和储能电源
By combining a rectifier module, a threshold determination module, and an overcurrent protection module, the complexity and high cost of existing overcurrent protection circuits are solved, enabling flexible adjustment of the overcurrent protection threshold and improving circuit safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN POWEROAK NEWENER CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the implementation of overcurrent protection circuits is relatively complicated, the hardware construction of logic circuits is costly, and it is difficult to flexibly adjust the overcurrent protection threshold.
Design an overcurrent protection circuit that combines a rectifier module, a threshold determination module, and an overcurrent protection module to flexibly determine the overcurrent protection threshold using adjustable current and upper limit current values, and outputs a protection signal when an overcurrent occurs.
It enables flexible adjustment of the overcurrent protection threshold, reduces circuit design and manufacturing costs, and ensures circuit safety and reliability.
Smart Images
Figure CN224520646U_ABST
Abstract
Claims
1. An overcurrent protection circuit, characterized by comprising: The overcurrent protection circuit includes a rectification module, a threshold determination module, and an overcurrent protection module; The overcurrent protection module is connected to the rectifier module and the threshold determination module respectively, and the threshold determination module is connected to the upper limit current value and the adjustable current value respectively. The rectifier module is used to rectify the current signal under test to obtain a half-wave current signal; The threshold determination module is used to compare the adjustable current value with the upper limit current value, and output the smaller of the adjustable current value and the upper limit current value as the overcurrent protection threshold. The overcurrent protection module is used to output an overcurrent protection signal when the half-wave current signal is greater than the overcurrent protection threshold.
2. The overcurrent protection circuit of claim 1, wherein, The threshold determination module includes a first input unit, a second input unit, and a first comparison unit; The first comparison unit is connected to the first input unit, the second input unit, and the overcurrent protection module, respectively. The first input unit is connected to the power supply, and the second input unit is connected to the adjustable current value. The first input unit is used to generate the upper limit current value based on the input voltage of the power supply; The second input unit is used to receive the adjustable current value; The first comparison unit is used to compare the adjustable current value with the upper limit current value, and output the smaller of the adjustable current value and the upper limit current value as the overcurrent protection threshold.
3. The overcurrent protection circuit according to claim 2, characterized in that, The first input unit includes resistor R2, resistor R3, and capacitor C2; The first end of the resistor R3 is used to receive the upper limit current value. The second end of the resistor R3 is connected to the first end of the resistor R2, the first end of the capacitor C2 and the first comparison unit, respectively. The second end of the resistor R2 and the second end of the capacitor C2 are both grounded.
4. The overcurrent protection circuit of claim 2, wherein, The second input unit includes resistors R8 and R9; The first end of the resistor R8 is used to receive the adjustable current value. The first end of the resistor R8 is connected to the second end of the resistor R9. The first end of the resistor R9 is connected to the power supply. The second end of the resistor R8 is connected to the first comparison unit.
5. The overcurrent protection circuit of claim 2, wherein, The first comparison unit includes an operational amplifier U2D and a diode D1; The non-inverting input terminal of the operational amplifier U2D is connected to the first input unit, the inverting input terminal of the operational amplifier U2D is connected to the second input unit, the output terminal of the operational amplifier U2D is connected to the negative terminal of the diode D1, and the positive terminal of the diode D1 is connected to both the inverting input terminal of the operational amplifier U2D and the overcurrent protection module.
6. The overcurrent protection circuit of claim 1, wherein, The overcurrent protection module includes a second comparison unit and a pull-up unit; The second comparison unit is connected to the pull-up unit, the threshold determination module, and the rectification module, respectively. The pull-up unit is also connected to the power supply. The pull-up unit is used to provide a reference voltage to the output of the second comparator unit based on the input voltage of the power supply; The second comparison unit is used to output the overcurrent protection signal when the half-wave current signal is greater than the overcurrent protection threshold.
7. The overcurrent protection circuit of claim 6, wherein, The second comparison unit includes a comparator U3B and a resistor R19; The non-inverting input of the comparator U3B is connected to the threshold determination module, the inverting input of the comparator U3B is connected to the second end of the resistor R19, the first end of the resistor R19 is connected to the rectifier module, the output of the comparator U3B is connected to the pull-up unit, and the output of the comparator U3B is used to output the overcurrent protection signal.
8. The overcurrent protection circuit of claim 6, wherein, The pull-up unit includes a resistor R16; The first end of the resistor R16 is connected to the power supply, and the second end of the resistor R16 is connected to the second comparison unit.
9. The overcurrent protection circuit according to claim 1, characterized in that, The rectifier module includes amplifier U2B, amplifier U2C, resistors R1, R7, R10, R11, R12, R13, diodes D2, D3, D7, and D8; The first ends of resistors R1 and R11 are both used to receive the current signal to be measured. The non-inverting input of amplifier U2B is connected to the second end of resistor R1. The inverting input of amplifier U2B is connected to the anode of diode D7 and resistor R7. The output of amplifier U2B is connected to the cathode of diode D7 and the anode of diode D2. The non-inverting input of amplifier U2C is grounded through resistor R13. The inverting input of amplifier U2C is connected to the second end of resistor R11, the first end of resistor R10, and the anode of diode D8. The output of amplifier U2C is connected to the cathode of diode D8 and the anode of diode D3. The cathode of diode D2 is connected to the second end of resistor R7, the second end of resistor R10, the cathode of diode D3, the first end of resistor R12, and the overcurrent protection module. The second end of resistor R12 is grounded.
10. An energy storage power supply, characterized by, The energy storage power supply includes the overcurrent protection circuit as described in any one of claims 1 to 9.