Experimental identification of LED compact thermal model element values

Janicki, Marcin; Torzewicz, Tomasz; Samson, Agnieszka; Raszkowski, Tomasz; Napieralski, A.

doi:10.1016/j.microrel.2018.05.003

Cited by 27 publications

(16 citation statements)

References 4 publications

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“…Moreover, extending the research presented by the authors in [26], the parametric relations describing the dependence of thermal resistances and capacitances on device operating current and temperature were proposed for the computation of CTM element values. The diode heating curves simulated with these parametric models showed very good agreement with the experimental results.…”

Section: Discussionmentioning

confidence: 94%

“…Here, there are two distinct minima located around 30 ms and 3 s, which are marked in the charts by arrows. These minima, as discussed in [26], correspond to the time instants when heat diffuses from the LED package to the MCPCB and then to the cold plate. Consequently, the thermal resistance of the leftmost section characterizes the heat flow from the junction through the package.…”

Section: Time Constant Spectramentioning

confidence: 98%

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Parametric Compact Thermal Models of Power LEDs

et al. 2019

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Light-emitting diodes are nowadays the most dynamically developing type of light sources. Considering that temperature is the main factor affecting the electrical and lighting parameters of these devices, thermal models are essential subcomponents of the multidomain models commonly used for simulation of their operation. The authors investigated white power light-emitting diodes soldered to Metal Core Printed Circuit Boards (MCPCBs). The tested devices were placed in a light-tight box on a cold plate and their cooling curves were registered for different diode heating current values and various preset cold plate temperatures. These data allowed the computation of optical and real heating power values and consequently the generation of compact thermal models in the form of Foster and Cauer RC ladders. This also rendered possible the analysis of the influence of the considered factors on the compact model element values and their parametrization. The resulting models yield accurate values of diode junction temperature in most realistic operating conditions and they can be easily included in multidomain compact models of power light emitting diodes.

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Section: Discussionmentioning

confidence: 94%

Section: Time Constant Spectramentioning

confidence: 98%

Parametric Compact Thermal Models of Power LEDs

et al. 2019

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“…Therefore, in Gdynia Maritime University (GMU), Poland, a custom set-up for measurement of power LED thermal parameters was developed. The measurement results obtained employing this set-up have already been described in, e.g., [14,16,17]. However, in these papers the measurements were taken only in free cooling conditions.…”

Section: Introductionmentioning

confidence: 94%

Comparison of Properties for Selected Experimental Set-Ups Dedicated to Measuring Thermal Parameters of Power LEDs

et al. 2021

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This article compares properties of two measurement set-ups dedicated to determining thermal parameters of power LEDs. The standard T3Ster set-up and the custom set-up developed in Gdynia Maritime University are considered. Both set-ups are described and the used measurement procedure is presented. The manner of measurement of optical power of the tested LEDs is also described. The method of measuring transfer transient thermal impedances between thermally coupled power LEDs using both set-ups is proposed. The measurement results of the mentioned parameters obtained with these set-ups for selected power LEDs are compared and discussed. Certain properties of software operating with both the considered measuring set-ups are also analyzed.

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“…Then, according to the principles of the network identification by deconvolution (NID) method, these responses have to be numerically differentiated so as to obtain the responses to the Dirac delta function and then the deconvolution operation produces the thermal time constant spectra [28], which after segmentation, according to the later described procedure, yield initial compact thermal model element values. Finally, these values are further optimized so as to minimize the simulation errors with respect to the measurements [29].…”

Section: Theoretical Backgoundmentioning

confidence: 99%

“…Consistent with the method described in [29], initially, the thermal resistor values in all the CTM stages were determined by separately accumulating the respective thermal resistances in each section. Then, the time constant values were found by minimizing the simulation errors with respect to the measured temperature values within each time constant range.…”

Section: Foster Rc Ladder Compact Thermal Modelsmentioning

confidence: 99%

Compact Thermal Modeling of Modules Containing Multiple Power LEDs

et al. 2020

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Temperature is an essential factor affecting the operation of light-emitting diodes (LEDs), which are often used in circuits containing multiple devices influencing each other. Therefore, the thermal models of such circuits should take into account not only the self-heating effects, but also the mutual thermal influences among devices. This problem is illustrated here based on the example of a module containing six LEDs forming on the substrate a hexagon. This module is supposed to operate without any heat sink in the natural convection cooling conditions, hence it has been proposed to increase the thermal pad area in order to lower the device-operating temperature. In the experimental part of the paper, the recorded diode-heating curves are processed using the network identification by deconvolution method. This allows for the computation of the thermal time constant spectra and the generation of device-compact thermal models. Moreover, the influence of the thermal pad surface area on the device temperature and the thermal coupling between LEDs is investigated.

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Experimental identification of LED compact thermal model element values

Cited by 27 publications

References 4 publications

Parametric Compact Thermal Models of Power LEDs

Parametric Compact Thermal Models of Power LEDs

Comparison of Properties for Selected Experimental Set-Ups Dedicated to Measuring Thermal Parameters of Power LEDs

Compact Thermal Modeling of Modules Containing Multiple Power LEDs

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