A ±1.5% nonlinearity 0.1-to-100A shunt current sensor based on a 6kV isolated micro-transformer for electrical vehicles and home automation

Abstract

A wide range of current-sensing techniques has been developed to satisfy various electrical and electronics applications requirements. In high-voltage applications, the main issue is the electrical isolation with accurate measurement at low signal levels. Isolated shunt technology is an attractive and versatile solution for current sensing. Electrical isolated products usually need a power supply at both low and high voltage sides. An original topology that needs only one power supply at the secondary (low voltage) side is reported. In this paper, we introduce an implementation of an integrated shunt current-measurement microsystem based on a 6 kV isolated micro-transformer. This work finds its applications in many domains such as hybrid or electric vehicle battery monitoring or motor control, system building automation or smart grids, where small size and low cost are required.