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LEDs driven by AC without transformers or rectifiers
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DOI：10.1038/s41598-020-80617-2.png)
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摘要
En 中文
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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期刊
IF:
3.9
论文数:
27.8W
被引数:
83.5W
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