Structure-Aware Compact Thermal Models of Power LEDs
Typ dokumentu
stať ve sborníkuconference paper
Autor
Kuźniak, K.
Szymańska, K.
Starzak, Ł.
Janicki, M.
Metadata
Zobrazit celý záznamAbstrakt
This paper based on the example of white power LEDs illustrates the methodology for the generation
of device compact thermal models, whose element values can be assigned physical meaning. The diode
thermal behaviour was studied both with the forced water cooling and with the natural convection air
cooling. Moreover, owing to the fact that the investigated devices had an electrically isolated thermal
pad, the measurements were carried out with the thermal pad properly soldered and with the pad left
unconnected, what facilitated the identification of particular sections in the heat flow path. All the
measurements of device heating or cooling curves were taken according to the JEDEC standards. The
determination of the optical power allowed the computation of the real heating power, which was used
then as the input quantity for thermal computations and analyses presented in this paper. Based on the
measurement results, thermal structure functions and time constant spectra were computed using the
Network Identification by Deconvolution method. The compact thermal models of the investigated LEDs
were derived based on the time constant spectra. Owing to the proposed methodology, it was possible
to attribute physical meaning to model element values. The accuracy of generated compact models was
validated by comparing the simulated heating curves with the measured ones. Although the compact
models for the investigated cases consisted only of four RC stages, they provided excellent simulation
accuracy with errors below 4% of the maximum temperature rise value.
Kolekce
- Archiv DOI [35]
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