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

The Korean Institute of Power Electronics (전력전자학회)
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Single Power-conversion AC-DC Converter with High Power Factor

고역률을 갖는 단일 전력변환 AC-DC 컨버터

  • Cho, Yong-Won (Dept. of Electronic and Electrical Eng., Pohang Univ. of science and technology) ;
  • Park, Chun-Yoon (Dept. of Electronic and Electrical Eng., Pohang Univ. of science and technology) ;
  • Kwon, Bong-Hwan (Dept. of Electronic and Electrical Eng., Pohang Univ. of science and technology)
  • Received : 2013.10.07
  • Accepted : 2013.11.18
  • Published : 2014.02.20
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Abstract

This paper proposes a single power-conversion ac-dc converter with a dc-link capacitor-less and high power factor. The proposed converter is derived by integrating a full-bridge diode rectifier and a series-resonant active-clamp dc-dc converter. To obtain a high power factor without a power factor correction circuit, this paper proposes a suitable control algorithm for the proposed converter. The proposed converter provides single power-conversion by using the proposed control algorithm for both power factor correction and output control. Also, the active-clamp circuit clamps the surge voltage of switches and recycles the energy stored in the leakage inductance of the transformer. Moreover, it provides zero-voltage turn-on switching of the switches. Also, a series-resonant circuit of the output-voltage doubler removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor of 0.995 and maximum efficiency of 95.1% at the full-load. The operation principle of the converter is analyzed and verified. Experimental results for a 400W ac-dc converter at a constant switching frequency of 50kHz are obtained to show the performance of the proposed converter.

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References

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