Bridged-T voltage control of a high bandwidth SiC inverter for various output waveforms with/without DC Offset at wide range of frequencies

Abstract

This paper provides a bridged-T voltage control scheme for a H bridge SiC inverter switching at 150 kHz for generating various waveforms at wide range of frequencies (60 Hz to 10 kHz) which is developed as a core loss test unit. Bridged-T controller attains the advantages of both the open and closed loop controllers. It has the fast dynamic response feature of the open-loop controller and zero steady state error feature of the closed loop controller. The controller has been designed to generate sine, triangle and square waveforms with and without DC offset. The system has been simulated and experimentally implemented in real time using digital signal processor. Simulation and experimental results are in close agreement.