Topology and Control Innovation for Auxiliary Power Supply in Dimmable LED Drivers

Jia, Liang; Liu, Yanfei

doi:10.1109/tpel.2016.2642126

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…As it was shown, among others, in papers [6][7][8], the value of the supplying current visibly influences the current-voltage characteristics as well as optical and thermal parameters of the considered class of semiconductor devices. However, in the literature there is no information about the influence of frequency, amplitude and the duty cycle of the current supplying the LED on its exploitation parameters.…”

Section: Introductionmentioning

confidence: 89%

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An Influence of Parameters of the Control Signal of Power LEDs on Their Junction Temperature and Emitted Light

Górecki,

Ptak,

Gensikowski

2023

Energies

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This article presents the method of implementation and the results of experimental investigations illustrating an influence of parameters of the signal controlling the current flowing through power LEDs on their junction temperature and on parameters characterizing the light emitted by them. The measurement system used and the tested power LEDs are described. The results of measurements of the junction temperature of the tested devices, the values of the average value of the power dissipated in the tested devices and the photometric and radiometric parameters of these devices obtained for different values of frequency and the duty cycle of the signal controlling the current flowing through the tested diodes are presented and discussed. It is shown that the operation of the considered semiconductor devices is more effective at low frequency values. The possibility of adjusting the optical parameters of the power LEDs in the considered range of frequency and the duty cycle adjustment is assessed. Additionally, the measured waveforms of the current supplying the tested LEDs is shown. The influence of the parasitic capacitances of the tested devices is discussed. On the basis of the obtained investigation results, some recommendations for the designers of lighting systems can be formulated. In order to obtain an almost linear dependence of the illuminance on the duty cycle, the values of frequency not exceeding 10 kHz should be used.

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Section: Introductionmentioning

confidence: 89%

“…These circuits produce the rectangular pulse trains of the current of the regulated duty cycle [3,4]. Such a way of supplying circuits makes it possible to increase the efficiency of the supply circuits and regulate the emitted luminous flux [6][7][8].…”

Section: Introductionmentioning

confidence: 99%