1 Introduction

Galvanic isolation is a necessary approach to prevent equipment breakdown and passenger electric shock when there are two distinct grounds of different electrical potentials in EV/ HEVs. Accordingly, isolation leakage measurement is a mandatory means to alert danger and to protect circuits and passengers. Leakage current is the sum of all AC currents from the traction battery to chassis ground through these resistances and impedances. In this way, insulation resistance represents the magnitude of the leakage current as traction battery is regarded as high voltage DC source. Meanwhile, some safety standards require a measurement of insulation resistance instead of leakage current.

TIDA-01513 presents an elaborate concept to realize single-point isolation leakage error measurement. It makes sense to extend TIDA-01513 to two-point insulation resistance measurements with the same hardware circuit topology. In addition, it can also be applied to higher voltage system such as 800 V by replacing appropriate switches and resistors.