The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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A High Efficiency Phase-Shifted Full-Bridge Converter with Wide Input Voltage Range

넓은 입력전압 범위에서 높은 효율을 가지는 위상천이 풀브릿지 컨버터

  • Received : 2018.07.09
  • Accepted : 2018.07.31
  • Published : 2019.02.20
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Abstract

This study proposes a high-efficiency phase-shifted full-bridge (PSFB) converter with a wide input voltage range. The conventional PSFB converter is a useful topology in high-power applications. This converter not only achieves the zero-voltage switching of the primary switches, but also has small RMS current in the primary side. However, because the conventional PSFB converter has large freewheeling current in the primary side when it is designed considering the hold-up time of the converter, such a converter has high conduction loss at the primary switches. To solve this problem, a new PSFB converter is proposed in this study. The experiment is implemented with an input voltage ranging from a 320 V-400 V and an output power specification of 715 W.

Keywords

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Fig. 1. General power supply. (a) Structure of power supplies, (b) operation duirng the hold-up time.

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Fig. 2. Conventional PSFB converter and its key waveforms.

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Fig. 3. Proposed PSFB converter and its key waveforms.

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Fig. 4. Comparison of the rectifiers. (a) Conventional PSFB converter and (b) proposed PSFB converter.

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Fig. 5. Voltage gain graph of the converters.

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Fig. 6. Voltage stress of rectifier diodes.

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Fig. 7. Key waveforms at 100% load condition. (a) Conventional PSFB converter and (b) proposed converter.

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Fig. 8. Efficiency comparison.

References

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