Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Design of New LED Drive using Energy Recovery Circuit

에너지 회수 회로를 이용한 새로운 LED 구동드라이브 설계

  • 한만승 (전남대학교 전기공학과 고아전공) ;
  • 임상길 (전남대학교 대학원 전기공학과) ;
  • 박성준 (전남대학교 전기공학과) ;
  • 이상훈 (한국승강기대학 승강기 전기설계과)
  • Received : 2011.01.27
  • Accepted : 2011.04.07
  • Published : 2011.06.30
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Abstract

The high-power LED (Light Emitting Diode) which is recently gaining popularity as a digital light source has such advantages as low power consumption, long life, fast switching speed, and high efficiency. Thus, many efforts are being made to use the high-power LEDs for general lighting. This paper proposes LED driving circuit uses a DC/DC converter that can recover energy to compensate for the current variations caused by changes in LED equivalent resistance following a temperature change instead of serial resistance. The maximum input voltage of this DC/DC converter has low voltage variations by temperature change when the rated current is formed. In order to return current to the input side, we need a high boosting at low power. Thus, to improve the low efficiency of power converter, the power converter can be configured in such a way to gather the powers of low-capacity DC/DC converters and return the total power. Experiments showed that the proposed system improved efficiency compared to the conventional LED drive using the existing DC/DC converter.

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References

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