NDLI: Optimum Injected Current Harmonics to Minimize Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC

Content Provider	IEEE Xplore Digital Library
Author	Xinbo Ruan Beibei Wang Kai Yao Shu Wang
Copyright Year	1986
Abstract	The lifetime of an ac-dc LED driver can be increased by eliminating the electrolytic capacitor. Unfortunately, it results in pulsation with twice the line frequency in the driving current. Injection of the third and fifth harmonics into the input current can reduce the peak-to-average ratio of the driving current, which is beneficial for reliable operation of the LEDs. This letter discusses the relationship between the peak-to-average ratio and the injected harmonics, and the optimum injected third and fifth harmonics to minimize the peak-to-average ratio are obtained, while ensuring that the input power factor is higher than 0.9 to meet the regulatory requirement such as the ENERGY STAR. This optimum injected current harmonics is verified by a flyback-based electrolytic capacitor-less LED driver with 25 V, 0.35 A output.
Sponsorship	IEEE Power Electronics Society
Starting Page	1820
Ending Page	1825
Page Count	6
File Size	786774
File Format	PDF
ISSN	08858993
Volume Number	26
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Harmonic analysis Peak to average power ratio Capacitors Power harmonic filters Driver circuits Turning power factor correction (PFC) Flyback converter harmonic current injection light-emitting diode (LED) peak-to-average ratio
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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