LEDs driven by AC without transformers or rectifiers
Hughes, Robin W.
Nature Publishing Group UK
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Hughes, R. W., & Warner, M. (2021). LEDs driven by AC without transformers or rectifiers. Scientific Reports, 11 (1) https://doi.org/10.1038/s41598-020-80617-2
Abstract: We explore the driving of LEDs by untransformed AC. An extreme case is driving 1.9 V threshold (red) LEDs with UK mains, peak voltage 325 V. Commonly, driving is by transformed, rectified (DC) supply with a series resistor (where a significant fraction of the power is wasted) to limit current in the LED. With AC, one can instead reactively limit to a maximum current safe for an LED by employing a series capacitive impedance. Cheaper and simpler supplies can thus be employed in some cases. We analyse such non-linear circuits, and also explore questions of duty cycle and power experimentally.
Article, /639/766/25, /639/166/987, article
Department for Education, UK Government (Isaac Physics, Isaac Physics)
Engineering and Physical Sciences Research Council (EP/P034616/1)
External DOI: https://doi.org/10.1038/s41598-020-80617-2
This record's URL: https://www.repository.cam.ac.uk/handle/1810/316146
Attribution 4.0 International (CC BY 4.0)
Licence URL: https://creativecommons.org/licenses/by/4.0/