HV voltage sensor for 16 series li-ion battery cells using chopper stabilized amplifier

Abstract

This paper proposes a HV voltage sensor for the 16 series Li-ion battery cells. In order to achieve low offset and low noise, the chopper stabilized technique is used for the OPA design. Besides, 9 resistor networks are employed to avoid the HV hazard caused by the HV signal of the 16 series battery cells. The proposed design is implemented using a typical 0.25 um 1P3M 60V BCD process. Based on HSPICE simulation results, the gate oxide overstress caused by the HV signal is avoided. Moreover, the detection error is only 0.404 mV.