科研之友
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摘要
A dual seriesresonant dcdc converter with zerovoltage switching and zerocurrent switching features is proposed in this paper. The topology consists of two switches and a clamping capacitor on the primary side of an isolating transformer. The two switches are operated in a complementary mode under a pulse widthmodulation (PWM) scheme. The secondary side of the transformer is connected to the load through two seriesresonant circuits and a halfbridge diode rectifying stage, in which the rise and fall slopes of the diode currents are limited by the slope of the currents in the resonant circuits, resulting in reduced switching losses in the diodes. The two seriesresonant circuits provide power transfer to the output load without interruption throughout the positive and negative cycles of operation. It is shown that the output voltage of the proposed converter can be regulated using either PWM control or frequency modulation control. Both stepdown and stepup voltage conversions can be achieved using the proposed topology. Programmable systemonchip is used as the controller platform to implement a 40 W laboratory prototype. A complete steadystate analysis is presented and the experimental results of the prototype of the proposed converter are discussed.
- 出版日期2017-5
