A new family of improved soft-switching ZVT power converters with an active snubber is developed in order to improve the efficiency of conventional ZVT power converters using a feedback inductor. Besides the ZVT turn-on performance of the main switch, the improved ZVT soft-switching power converters have less turn-off switching loss of the main switch than do conventional ZVT converters using a feedback inductor. With this new technique, an improved single-phase CCM ZVT soft-switching PFC power converter prototype has been implemented to show higher efficiency improvement than the conventional ZVT converters using a feedback inductor.
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Lin et al. (2002) studied this question.
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