A charging overcurrent detection system of a lithium battery protection chip
By combining a bandgap reference voltage divider circuit and a negative voltage detection circuit with PMOS and NMOS transistors, the accuracy problem of charging overcurrent detection in lithium battery protection chips is solved, achieving high-precision and flexible charging overcurrent detection and improving the safety of lithium battery charging.
CN115932375BActive Publication Date: 2026-07-07NANJING MICRO ONE ELECTRONICS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANJING MICRO ONE ELECTRONICS
- Filing Date
- 2022-12-21
- Publication Date
- 2026-07-07
Smart Images
Figure CN115932375B_ABST
Abstract
The application discloses a charging overcurrent detection system of a lithium battery protection chip, wherein different voltage division values of a band gap reference are obtained through resistance section taps and provided to a negative voltage detection circuit, the negative voltage detection circuit is provided with bias current tubes MP1, MP4 and MP7, differential input pair tubes MP2, MP3, MP5 and MP6, current mirror loads MN1 and MN2, and common source amplification input tube MN3; MP1, MP4 and MP7 control the size of static power consumption, the gate of MP6 is connected with a negative voltage port to be detected, the output VOUT of the negative voltage detection circuit is a charging overcurrent signal, and the charging control port of a protection chip IC is controlled; by adjusting the reference voltage VREF value, the negative value of the reference voltage VREF value is a negative voltage target value to be detected, so that high-precision charging overcurrent detection is realized.
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