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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...
A new push pull boost ac-dc or dc-dc single stage pulse width modulated (PWM) converter is proposed. The converter operates with zero voltage switching (ZVS), and continuous input current. It feature several merits such as single stage energy processing and good input current shaping. The converter topology also has zero turn-on loss even when used with hard switching. An auxiliary switch clamps the...
The cusp distortion is an inherent behavior of all boost PFC rectifiers. Though the contribution of cusp distortion is small but it limits the maximum achievable performance in PFC rectifier. In spite of this fact, little effort has been made in the past to avoid cusp distortion. We will propose a new topology to minimize the distortion in boost rectifier. The main characteristic of the proposed topology...
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