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摘要
This paper presents a new DC/DC converter with series-connected transformers in order to realize the functions of zero voltage switching (ZVS) for power switches, less transformer secondary winding and less output ripple current with a current double rectifier, and load current sharing for high input voltage applications. Two converter cells are connected in series at high voltage side to reduce the voltage stresses on active switches. Thus the voltage stress of each active switch is clamped at half of input DC voltage. The output sides of two converter cells are connected in parallel to reduce the ripple current on output capacitor and achieve load current sharing. The interleaved pulse-width modulation (PWM) scheme is used for control two converter cells to reduce the ripple current at the output capacitor such that the output filter inductors can be reduced. In each converter cell, two asymmetrical half bridge circuits with the same power switches are adopted to regulate the output voltage at the desired voltage level. Based on the resonant behavior by the output capacitance of active switches and the transformer leakage inductance, MOSFETs can be turned on at zero voltage switching (ZVS) during the transition interval. Finally, experiments with a laboratory prototype (24V/40A) are provided to demonstrate the performance of proposed converter.
- 出版日期2012-10
