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A new cascade buck-boost topology with passive lossless snubber is proposed in this paper, it has been successfully used in PFC circuit of high voltage system. Switching losses and EMI noises are reduced by restricting di/dt of the diode reverse recovery current and dv/dt of IGBT collector-emitter voltage. The IGBT in the buck circuit operates at ZVS turn-off and ZCS turn-on. The freewheeling diode...
The paper presents a fully soft-switched three-stage ac-dc power supply for server applications. In this three-stage architecture, the front-end boost power factor correction (PFC) is followed by a dc-dc boost converter that serves as a preregulator to the isolated dc-dc output stage. Through magnetic integration, soft switching of all semiconductor switches in the PFC boost converter and the dc-dc...
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