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Gadget Freak Case #239: Bridge Rectifier Eliminates LED Light Flicker

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notarboca
User Rank
Gold
Re: Product improvement
notarboca   4/29/2013 9:11:24 PM
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Thanks Design News for bringing this modification to "light".  I'll be using this rectfier for holiday lights this season.

Debera Harward
User Rank
Silver
Re: Product improvement
Debera Harward   4/29/2013 7:05:10 PM
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Light emitting diodes are becomming very  popular these days people are using them instead of other lights because they are cost effective .Because leds are connected to the AC Supply it produces ripples at the outer end which results in flickering.Any light source which is connected to AC supply results in flickers.

However flickering can be reduced with different methods one method is to use high frequency switching supplies, which helps to reduce the AC component of the main supply and reduces the flickers but not all flickers are avoidable .Remaining flickers can be removed by attenuating g the AC component at  the output

Charles Murray
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Blogger
Question
Charles Murray   4/29/2013 6:27:27 PM
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What a great idea. I do have a question, though. Does this mean that whenever I buy an LED light bulb and run it on AC, I will be subjected to the possibility of the headaches you describe?

manning6
User Rank
Iron
Re: Product improvement
manning6   4/29/2013 6:02:56 PM
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This approach may well shorten the lifetime of the string of LED's. The LED's are brighter because the duty cycle has increased from about .5 too near 1, the average current has increased by a factor of 2 and device (LED) heating has certainly increased. It appears in the video that one of the LED's in the demo string of white LED's has been replaced with a red LED. Was this due to failure of the white LED operating under the more stringent conditions?

NadineJ
User Rank
Platinum
Re: Product improvement
NadineJ   4/29/2013 10:40:47 AM
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This is very cool.  I get mild headaches from LEDs as well.  I can see these selling quickly during the holidays.  Open the etsy store and start building inventory!

naperlou
User Rank
Blogger
Necessary component
naperlou   4/29/2013 10:27:07 AM
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Bernard, this shounds like a necessary component.  I wonder that the manufacturers do not include it.This type of flicker is also something that makes CFLs unattractive to some people.

Rob Spiegel
User Rank
Blogger
Product improvement
Rob Spiegel   4/29/2013 8:15:55 AM
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This is one of those gadgets that improves on a commercial product. And it makes you wonder why this improvement was not part of the make-up of the original product. Nice job.

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