Led Flicker
Posted in Home Decor Candles on 05/06/2003 03:36 pm by admin
Does 120 VAC LED light bulb have a built in rectifier?
LED light bulb works on forwar bias and off on reverse bias. Are we simply let the negative part of the AC current go wasted (as it can not light up the bulb) or we rectify it (the negative AC) to continue lighting up the bulb? If the negative part of the current is not use, will the LED light bulb flicker like the florescent light?
To start off, just because it allows current one way does not mean it is a true rec. A rec is a series of four diodes, and leD is one by definition and therefore cannot be a rectifier.
To actually answer your question, AC current varys at a rate of 60Hz in the United States, so even if you did not rectify the currect you would not see flickering (TVs changes full pictures at a rate of 30Hz). Instead, the lightbulb would appear half as bright. This is actually how many display boards control brightness, plusing the lights on and off very very quickly at different rates (the faster the brighter).
For a lightbulb, however, especially when dealing with LEDs, one wants want max brightness (LEDs are generally not very bright). I assume, therefore, that commercial LED bulbs have built in recs as to maximize brightness.
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