A New Two-Switch PFC DCM Boost Rectifier for Aviation Applications

Abstract

A new two-switch, single-phase, power-factor-correction (PFC), discontinuous-conduction-mode (DCM) boost rectifier that features zero-voltage switching (ZVS) and can achieve less than 5% input-current total harmonic distortion (THD) by injecting a simple feedforward signal obtained from input and output voltages to the output voltage feedback control is introduced. Since low THD is achieved without high bandwidth active current shaping control, the proposed topology is suitable for modern aviation applications that require line frequency up to 800 Hz. The evaluation was performed on a 320 W prototype designed to operate from 94-134 V line input and deliver 220 V dc output. The prototype achieves 2.3% THD at full load over the line frequency range from 360 Hz to 800 Hz and meets the required harmonic limits specified by the DO-160 standard that describes the environmental conditions and test procedures for airborne equipment.