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A Study on Power LED driving constant Current-type DC-DC converter Driven using microcontroller

마이크로컨트롤러를 이용한 Power LED 구동용 정전류형 DC-DC컨버터 구동에 관한 연구

  • Hwang, Lark-Hoon (Dept.of Electrical Engineering, Semyoung University) ;
  • Na, Seung-Kwon (Dept.of Biomedical Engineering, korea Polytechnics College) ;
  • Choi, Gi-Ho (Dept.of Electric Control Engineering, korea Polytechnics College)
  • 황락훈 (세명대학교 전기공학과) ;
  • 나승권 (한국폴리텍대학 의용공학과) ;
  • 최기호 (한국폴리텍대학 전기제어학과)
  • Received : 2011.12.06
  • Accepted : 2012.04.12
  • Published : 2012.04.30

Abstract

In this paper, Power LED(Light Emitting Diodes) is studied to driver as a new lighting system in the spotlight, replacing a large existing lighting system with fluorescent and incandescent lighting. To take advantage a variety of DC power as the boost DC-DC converter design specifications through the inductor L and capacitor C through PSPICE to calculate the best estimate of the value. Converter's switching frequency is 50[kHz], the first Duty Rate was made to increase gradually depending on the value of the detection were, 10[%] in the output voltage. As a result, the simulated Boost Power LED driver characteristics is in comparison with the design specifications, 5[%] or less as the error was approximated. So, when input 15[V] were offered, a stable output 24[V] were obtained, and Dimming Control through the adjustment of brightness and current consumption were obtained to possible result.

본 연구에서 LED는 에너지 소비가 큰 기존의 조명 시스템인 형광등과 백열등을 대체할 수 있는 새로운 조명 시스템으로 주목받고 있으며, 파워 LED 구동기인 DC-DC 컨버터에 관한 연구이다. 다양한 직류전원을 활용 할 수 있는 승압형 DC-DC 컨버터로 설계사양을 통한 인덕터 L과 커패시터 C의 값을 산출하여 PSPICE를 통한 최적의 값을 추정하였다. 컨버터의 스위칭 주파수는 50[kHz]로 최초 듀티비는 10[%]에서 출력전압의 검출 값에 따라 점차적으로 증가시키도록 하였다. 그 결과로 승압형 파워 LED 구동기를 시뮬레이션한 특성은 설계사양과 비교하여 5[%]이하의 오차로 근사적으로 나타났다. 또한, 입력전압 15[V]를 인가하여 안정된 24[V]의 안정된 출력전압을 얻었으며, 디밍제어를 통한 밝기 조절 및 소비전류의 조정이 가능한 결과를 얻을 수 있었다.

Keywords

References

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