Abstract

Recent advancements in semiconductor technology and the commercial availability of low on resistance and parasitic capacitors wide bandgap devices (SiC & GaN) has led power electronics systems to achieve efficiency as high as 99% for three phase boost PFC rectifier systems. However, this high efficiency is attainable only for rectifiers running at low switching frequencies ( 1 MHz). However, conventional boundary conduction mode (BCM)/CRM for three phase rectifier systems, does not generate sinusoidal average input current. A Zero Voltage Switching (ZVS) BCM control with sinusoidal input current for three phase 2-level converter is presented in this paper. This paper covers unity power factor (u.p.f.) operation, active + reactive power and also purely reactive power generation cases. The control scheme is presented in detail and ZVS turn-on operation is also discussed. The simulation and experimental results are discussed in the end. For a 1.2 KW converter, power density achieved by >500 kHz switching frequency operation is ∼80 W/in3 and with soft switching, 99 % efficiency is maintained.

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