An on-chip high-voltage current sensor for battery module monitoring

This paper presents an on-chip high-voltage (HV) current sensor for battery module monitoring. Battery management systems (BMS) are key technology of electric vehicles (EV) or hybrid EV. BMS is assembled by battery modules consisting of series of battery cells. Owing to high supply voltage and large current, the HV current sensors are needed for security, but they are not easily implemented on chip. Thus, we proposes an on-chip high-voltage current sensor to resolve this issue. The proposed HV current sensor in this work provides a wide sensing voltage range as well as large sense current range. The proposed design is implemented using a typical 0.25 μm 1P3M 60V BCD process. The on-chip sensing current range of the proposed HV current sensor is from 0.5 A to 1 A. The error of the proposed HV current sensor is only ± 0.37 %. Notably, the sensing voltage range is up to 20 V~40 V.