LEDs driven by AC without transformers or rectifiers

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...

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Detalles Bibliográficos
Autores principales: Hughes, Robin W., Warner, Mark
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807037/
https://www.ncbi.nlm.nih.gov/pubmed/33441881
http://dx.doi.org/10.1038/s41598-020-80617-2
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author Hughes, Robin W.
Warner, Mark
author_facet Hughes, Robin W.
Warner, Mark
author_sort Hughes, Robin W.
collection PubMed
description 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.
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spelling pubmed-78070372021-01-14 LEDs driven by AC without transformers or rectifiers Hughes, Robin W. Warner, Mark Sci Rep Article 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. Nature Publishing Group UK 2021-01-13 /pmc/articles/PMC7807037/ /pubmed/33441881 http://dx.doi.org/10.1038/s41598-020-80617-2 Text en © The Author(s) 2021 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Hughes, Robin W.
Warner, Mark
LEDs driven by AC without transformers or rectifiers
title LEDs driven by AC without transformers or rectifiers
title_full LEDs driven by AC without transformers or rectifiers
title_fullStr LEDs driven by AC without transformers or rectifiers
title_full_unstemmed LEDs driven by AC without transformers or rectifiers
title_short LEDs driven by AC without transformers or rectifiers
title_sort leds driven by ac without transformers or rectifiers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807037/
https://www.ncbi.nlm.nih.gov/pubmed/33441881
http://dx.doi.org/10.1038/s41598-020-80617-2
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