Active Switch Impact on CCM Totem-Pole PFC Efficiency

This paper presents the impact of active switch selection on an efficiency sensitive application using totem-pole power factor correction (TPPFC) topology in continuous conduction mode (CCM). Wide band gap (WBG) switches that provide low reverse recovery are a key enabler for a CCM TPPFC implementation. Several WBG based CCM TPPFCs with very high efficiency have been presented. As CCM TPPFC becomes a promising solution to reach the 80 PLUS Titanium efficiency standard, a selection method for WBG active switches is needed. A device loss model is developed based on datasheet characteristics and double pulse test results and it is incorporated into a Totem Pole PFC circuit model to predict losses due to the active switch under real world operating conditions. Results from a 1.5 kW-CCM TPPFC testing platform operating at 100 kHz under low line (115 VAC) and high line (230 VAC) input are also presented.