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| A Novel ZVZCS Phase-Shifted Full-Bridge Converter with Coupled Inductor |
| Zhang Qiang,Lin Weiming,Xu Yuzhen |
| College of Electrical Engineering and Automation Fuzhou University Fuzhou 350108 China |
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Abstract In high voltage and large power applications,IGBTs are often chosen as power switches. Due to their tail currents,zero current turning-off can reduce switching loss effectively. A two-winding coupled inductor and two diodes are introduced to realize zero-voltage and zero-current switching(ZCS) for phase-shifted full-bridge converter. ZCS of the lagging-leg switches is achieved in wide load range. The added diodes are turned on and off with soft switching. The leakage inductor of the coupled inductor will not increase voltage stress of the added diodes. To reduce the impact of magnetizing current of the coupled inductor on ZCS,two small capacitors are paralleled with two diodes,respectively. Without increasing the size of the coupled inductor,the interval of the reset voltage is increased so that the lagging-leg switches can be turned off with ZCS in practice. The analysis is verified by simulation and experimental results on a 68 kHz,100 V/10 A prototype. The results of simulation and experiment verify the validity of the proposed scheme.
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Received: 25 May 2015
Published: 21 November 2016
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2016, Vol. 31 
