LEDs driven by AC without transformers or rectifiers.
Accepted version
Peer-reviewed
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Repository DOI
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Authors
Hughes, Robin W
Warner, Mark https://orcid.org/0000-0003-3172-0265
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.
Description
Keywords
40 Engineering, 4009 Electronics, Sensors and Digital Hardware
Journal Title
Sci Rep
Conference Name
Journal ISSN
2045-2322
2045-2322
2045-2322
Volume Title
11
Publisher
Springer Science and Business Media LLC
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All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/P034616/1)