High frequency resonant DC link PWM inverter

PWM inverters have been used in industry to control voltage, frequency and harmonics. However the switching devices used in PWM inverters have high switching losses due to the hard switching configuration. Therefore, high frequency resonant DC link inverters have been proposed to reduce the switching losses of power devices. This paper reports a simulation developed for the use of PWM with the high frequency resonant DC link inverter to increase the operational advantages of PWM. A shifting strategy has been proposed to produce new switching signals synchronised with the zero resonant voltage by keeping the high frequency resonant cycles constant and shifting the PWM signals slightly from their original place to the points where the resonant voltage is zero. The results obtained from the normal PWM inverter were compared with the results obtained from the proposed strategy. The comparisons between these results have proved the validity of the new scheme.