High Efficiency LED Power Supply

Author

Pollock, Anne ; Pollock, Helen ; Pollock, Charles

Author_Institution

Technelec Ltd., Oakham, UK

Volume

3

Issue

3

fYear

2015

fDate

Sept. 2015

Firstpage

617

Lastpage

623

Abstract

A new high efficiency light-emitting diode (LED) and an organic LED power supply are presented. An LED string is split into two sections. A first LED string is driven by a conventional dc-to-dc converter, while a second LED string is placed in series with the incoming dc supply current. Power is delivered to the second LED string without passing through the dc-dc converter, thus improving the system efficiency of the circuit. The equations presented show that the efficiency of the whole circuit will always be higher than the efficiency of the dc-dc converter alone. The performance of the new high efficiency circuit was tested and it was found that the new high efficiency circuit offered an improvement in efficiency of the LED driver of 3% at an automotive supply voltage of 14 V.

Keywords

DC-DC power convertors; driver circuits; light emitting diodes; LED driver; LED string; automotive supply voltage; dc supply current; dc-to-dc converter; high efficiency LED power supply; high efficiency light-emitting diode; organic LED power supply; voltage 14 V; Inductors; Integrated circuit modeling; MOSFET; Organic light emitting diodes; Power supplies; Pulse width modulation; Automotive electronics; LED lamps; OLED lamps; dc-dc power converters; dc???dc power converters; energy efficiency; light emitting diode (LED) lamps; organic LED (OLED) lamps; power supplies;

fLanguage

English

Journal_Title

Emerging and Selected Topics in Power Electronics, IEEE Journal of

Publisher

ieee

ISSN

2168-6777

Type

jour

DOI

10.1109/JESTPE.2015.2430621

Filename

7103026