Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Fabrication and Characteristics of Transformers for High Power Density SMPS

고밀도 SMPS 용 변압기의 제조와 특성

  • 김현식 ((주) 매트론 기술연구소) ;
  • 김종령 ((주) 매트론 기술연구소) ;
  • 허정섭 ((주) 매트론 기술연구소) ;
  • 오영우 (경남대학교 재료공학과) ;
  • 송재성 (한국전기연구원 전자기소자그룹)
  • Published : 2002.04.25
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Abstract

We designed the flyback planar transformer, which had 8W capacity, with 70V input voltage and 8.2V output voltage for the establishment of design method and the confirmation of application possibility. The numerical value of inductance measured under the switching frequency of 120 kHz was 1650 ${\mu}H$, which was the inductance efficiency of 85~87% against theoretical value. The A.C. resistance of primary and secondary coil was 4.2 ${\Omega}$ and 0.25 ${\Omega}$ respectively. On the other hand, the quality factor for each wound numbers showed quite a high value of 158 and 75 respectively. And the Coupling Factor was 0.96~0.97 under 120 kHz switching frequency. And the shape of the output wave of the planar transformer at 70V input voltage was a stable square wave.

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