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An AC-DC LED Driver with a Two Parallel Floating Buck Topology for Reducing the Light Flicker in Lighting Applications to Low-Risk Levels : 조명 장치에서 플리커를 낮은 위험 수준으로 줄이기 위해 두 개의 평행한 플로팅 벅 구조를 사용한 교류-직류 엘이디 구동 회로
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- Authors
- Advisor
- 정덕균
- Major
- 공과대학 전기·컴퓨터공학부
- Issue Date
- 2016-08
- Publisher
- 서울대학교 대학원
- Keywords
- AC-DC power conversion ; Light-emitting diodes (LEDs) ; LED driver ; Analog and digital integrated circuit design ; Pulse width modulated power converters ; flicker ; floating buck converter
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2016. 8. 정덕균.
- Abstract
- This dissertation presents an ac-dc LED driver that consists of two parallel floating buck converters. To buffer the twice-line-frequency energy, one floating buck converter conveys energy to a storage capacitor, simultaneously performing the power factor correction (PFC). The other floating buck converter regulates the LED current to maintain a constant brightness in the LEDs for reducing the light flicker to low-risk levels. The proposed architecture reduces the voltage stress and the size of the storage capacitor, enabling the use of a film capacitor instead of an electrolytic capacitor. Considering the power factor and the flicker standards, a de-sign procedure to achieve a high power factor, while minimizing the storage capac-itance and the LED current ripple, is presented. A prototype of the proposed LED driver has been implemented with an on-chip controller IC fabricated in a 0.35 μm CMOS process and its functionality and performance have been verified experi-mentally. It demonstrates a power factor of 0.94 and a peak power efficiency of 85.4% with an LED current ripple of 6.5%, while delivering 15 W to the LEDs.
- Language
- English
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