A resonant DC link inverter for an electric vehicle
This paper presents the development of a resonant DC link inverter for an electric vehicle application. The resonant link frequency is approximately 70kHz and the inverter drives a low voltage 2.2kW AC induction motor. The IGBT inverter operates off a 240V DC supply and an active clamping circuit limits the resonant bus voltage to 500V. A synchronized PWM scheme is used to modulate the resonant inverter. Experimental results showing the operation of the resonant inverter in motoring and regenerating modes are given. A performance comparison of hard switching and resonant inverters with respect to power losses and motor current THD is provided, and it is shown that at PWM frequencies greater than 10kHz the resonant inverter is more efficient.