A capacitor-less and low-ripple power supply circuit design for LEDs

Pao Yue-kong Library Electronic Theses Database

A capacitor-less and low-ripple power supply circuit design for LEDs

 

Author: Liu, Kaiyu
Title: A capacitor-less and low-ripple power supply circuit design for LEDs
Degree: M.Sc.
Year: 2012
Subject: Light emitting diodes.
Electronic circuit design.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Electronic and Information Engineering
Pages: v, 51 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2531577
URI: http://theses.lib.polyu.edu.hk/handle/200/6876
Abstract: Considering that over 20% of the world electricity generation is consumed by electric lighting, it is believed that a major energy saving is possible when light emitting diodes (LEDs) are ultimately adopted for general lighting. LED has various performance aspects, the lifespan is one of them which greatly affects the quality of LED lighting system. Since LEDs operate at low DC voltage, power converters are required to transform the AC mains power into DC power. Although high power efficiency is typically achievable in modern power converters, they generally suffer from premature failure due to the malfunctioning of electrolytic capacitors, which is a critical component in AC-DC power conversion. To the consumers, this is highly undesirable due to the high replacement cost involved and must be avoided. The proposed project aims to reduce the electrolytic capacitors in a certain extent at the expense of a little efficiency. In this paper, according to the characteristic of LED, a flyback circuit with a new linear constant current circuit will be designed and realized. Simulation and hardware testing will be given to identify the feasibility of the circuit.

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