A General Photo-Electro-Thermal Theory for Light Emitting Diode (LED) Systems

Author

Hui, S.Y.R. ; Qin, Y.X.

Author_Institution

Centre for Power Electron., City Univ. of Hong Kong, Hong Kong

fYear

2009

fDate

15-19 Feb. 2009

Firstpage

554

Lastpage

562

Abstract

The photometric, electrical and thermal features of LED systems are highly dependent on one another. By considering all these factors together, it is possible to optimize the design of LED systems. This paper presents a general theory that links the photometric, electrical and thermal behaviors of a LED system together. The theory shows that the thermal design is an indispensible part of the electrical circuit design and will strongly influence the peak luminous output of LED systems. It can be used to explain why the optimal operating power, at which maximum luminous flux is generated, may not occur at the rated power of the LEDs. This theory can be used to determine the optimal operating point for a LED system so that the maximum luminous flux can be achieved for a given thermal design. The general theory has been verified favorably by experiments using high-brightness LEDs.

Keywords

light emitting diodes; photometry; thermal resistance; thermoelectric devices; electrical circuit design; high-brightness LED system design; light emitting diode; luminous flux; photo-electro-thermal theory; photometric behaviors; thermal design; thermal resistance; Control systems; Electric resistance; Light emitting diodes; Photometry; Power system modeling; Resistance heating; Temperature; Thermal factors; Thermal management; Thermal resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE

Conference_Location

Washington, DC

ISSN

1048-2334

Print_ISBN

978-1-4244-2811-3

Electronic_ISBN

1048-2334

Type

conf

DOI

10.1109/APEC.2009.4802712

Filename

4802712