A Compact Flicker-Free Transformer-Less LED Driver With an Enhanced Power Factor for Omnidirectional Multichannel Smart Bulb Applications

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In this paper, a flicker-free transformer-less multi-channel light-emitting diode (LED) driver that adopts a new power factor enhancement technique is presented. The proposed LED driver divides the transmission path of the current to the LED string in two ways depending on the instantaneous input voltage in order to improve the PF relative to that of a conventional compact flicker-free LED driver that uses a fixed LED current regulation scheme with only one electrolytic capacitor. The proposed driver can be implemented with a minimum number of external components leading to a compact module that allows a light bulb with omnidirectional light emission. In order to enhance the expandability of the smart bulb, a conventional buck converter with 3-V output is integrated with the proposed LED driver to supply the peripherals of the module. The proposed LED driver IC is implemented in a 0.35-mu m ultrahigh voltage CMOS process and occupies an area of 2.9 mm x 2.0 mm. A 10-W smart bulb prototype that adopts the proposed LED driver is flicker free and shows a power factor of 0.715 and power conversion efficiency of 77.5% for an ac supply of 120 V.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

ELECTROLYTIC CAPACITOR; OUTPUT CURRENT; CONVERTER; CIRCUIT

Citation

IEEE TRANSACTIONS ON POWER ELECTRONICS, v.31, no.8, pp.5851 - 5862

ISSN
0885-8993
DOI
10.1109/TPEL.2015.2498193
URI
http://hdl.handle.net/10203/208630
Appears in Collection
EE-Journal Papers(저널논문)
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