A Novel Dead-Time Control Method for Double End Converter

Abstract

In order to achieve symmetry of the drive signal and suppress the magnetic bias, a novel dead-time control method for the double end converter is put forward in this paper, which can generate two independent and complementary PWM waveforms by configuring EPWM (Enhanced Pulse Width Modulator) module. The magnetic bias problems of the double end converter, principle of EPWM module and adjustment process of the dead-time control method are analyzed. Two different dead-times can de realized by setting the rising edge delay and falling edge delay of the corresponding registers in Dead-band (DB) module in one cycle to meet the requirement of drive signals. Experimental research on the novel dead-time control method is done on the push-pull forward circuit and the experiment results verify the feasibility of the proposed method.