Abstract

The automotive industry is transitioning from combustion engines to electric vehicles (EV) and hybrid electric vehicles (HEV). One of the key parts of an EV and HEV system is a Traction Inverter. The traction inverter takes the DC input power from the high-voltage (HV) battery and provides the controlled AC power to the e-motor. Along with power Switches and gate drivers, isolated bias power supply is a major portion in the traction inverter circuit. One of the main functions of the isolated bias supply is to provide the required power to the gate drivers. There are several possible architectures for the isolated bias power supply. These architectures also influence the choice of the topologies and associated devices.