• Journal of Power Electronics
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• 제16권3호
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• pp.883-893
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• 2016

This paper presents a comprehensive analysis of the spurious turn-on phenomena in phase-shifted full-bridge (PSFB) converters. The conventional analysis of the spurious turn-on phenomenon does not establish in the PSFB converter as realizing zero voltage switching (ZVS). Firstly, a circuit model is proposed taking into account the parasitic capacitors and inductors of the transistors, as well as the parasitic elements of the power circuit loop. Second, an exhaustive investigation into the impact of all these parasitic elements on the spurious turn-on is conducted. It has been found that the spurious turn-on phenomenon is mainly attributed to the parasitic inductors of the power circuit loop, while the parasitic inductors of the transistors have a weak impact on this phenomenon. In addition, the operation principle of the PSFB converter makes the leading and lagging legs have distinguished differences with respect to the spurious turn-on problems. Design guidelines are given based on the theoretical analysis. Finally, detailed simulation and experimental results obtained with a 1.5 kW PSFB converter are given to validate proposed analysis.

• 한국전자통신학회논문지
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• 제13권6호
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• pp.1177-1182
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• 2018

UCC3895 드라이버를 이용하여 위상천이방식의 100Mhz로 운용되는 500W급 영전압스위칭(Zero voltage switching) DC/DC 컨버터를 설계하였다. UCC3895 드라이버의 데드타임은 풀브리지의 리딩래그와 레깅래그가 별도로 구동 가능하도록 설계되어 있어 두 래그간에 데드타임을 별도로 부여하는 것이 가능하며, 이것은 두 래그간에 비대칭관계인 데드타임으로 영전압스위칭의 구현을 가능하게 하였다. 또한 본 논문에서는 안정된 출력전압을 위한 부귀환회로 설계방식이 제안되었다. 시제품의 최대 효율은 $500{\Omega}$의 부하에서 95.5% 정도를 나타냈다.