Hysteresis based Triangular Current Mode Control for Bridgeless Totem Pole Converter

Bridgeless Totem-Pole PFC (BTPPFC) converter has become an attractive contender for front-end PFC converter in recent years owing to low component count and wide range ZVS capability. Triangular Current Mode (TCM) has been developed to achieve ZVS over full line cycle on the converter which require complex turn-on/turn-off calculation for optimal operation. In this paper, a simpler analog method to achieve ZVS is proposed which make high-end DSP requirement redundant in implementing TCM. Deadband analysis for ZVS is also discussed in detail for integrality of TCM based ZVS operation.