An inrush limited, surge tolerant hybrid resonant bridgeless PWM AC-DC PFC converter

This paper introduces the inherent inrush current limiting and line surge tolerance capabilities of a hybrid resonant pulse width modulated (HRPWM) bridgeless ac-dc converter. The inrush current limiting and line surge tolerance capabilities improve system reliability while the low component count reduces losses and cost. This paper discusses different inrush current limiting circuits for conventional boost converters and analyzes the drawbacks associated with them. The operation, several key design considerations, and the surge tolerance of the proposed converter are discussed. The inrush current and input voltage surge performance of a prototype of the converter are presented and compared with a benchmark boost converter to verify the proof of concept. Finally experimental results are shown for the prototype unit converting a universal ac input to a 650W, 400 V output, operating at 70 kHz switching frequency.