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LED Power Supply Lasts 100,000 Hours

Written by Megan Treacy on 23/04/09

LEDs currently have a lifetime of about 30,000 to 40,000 hours, but the power supply apparatuses for the lights only have a lifetime of about 10,000 hours, resulting in a gap that could hold back further gains in efficiency in LED technology. That gap in endurance is just what Kaga Components has set out to close.

The Japanese company demonstrated a new power supply apparatus last week that has a lifetime of more than 100,000 hours. The company said the part of the power supply that was limiting lifetime hours was the electrolytic capacitor. The company removed it and downsized the power supply circuit in order to achieve the much longer life.

Because the patent is still pending and the power supply is still under development, the company isn't disclosing the exact details of the circuit configuration. The apparatus is compatible with one to five series-connected LEDs and input powers of 100 and 200V.

The price for the power supply is around US $5.

via Tech-On

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LED Power Supply Lasts 100,000 Hours
written by Glenn, April 23, 2009
LEDs are the future, until something better comes along. Right now we need a large manufacturing scale to lower the cost. You can purchase really cool LED dynamo lights and chargers at http://OakleighVermont.com/buy
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written by John Rowell, April 23, 2009
I wonder how they managed to design a switching power supply without using a capacitor. A bridge rectifier and a transformer would do the same function I suppose, but this looks much more advanced.
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how complicated does it need to be?
written by shek, April 23, 2009
I know SOP for LED's is a nice stable DC current, but are there good reasons not to simply put just a rectifier and a current limiter? Wouldnt this lead to LEDs that flash at 60 Hz? Would this cause discomfort to our eyes or shorted LED lifespan?
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written by Wouter, April 24, 2009
you could use diodes to change AC to DC, so you do not have 60Hz / 50Hz (europe) flashing lights. Note that gerular lamps flash the same way.
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written by Klaus, April 25, 2009
No electrolytic capacitor does not mean no capacitor at all. With current manufacturing technology you can get higher capacity ceramic capacitors than before. Coupled with ever higher switching frequencies in switching power supply IC's you get a design where you do not need a electrolytic capacitor in your power supply. The only thing that stumps me is what do they think they can patent here.

Klaus
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written by KenZ, April 27, 2009
I don't think this is a switching power supply. I think it's an either/or 110/220. Also, look at the picture. It lists the input as 100VAC(ish), indicating there's a 200/220(ish) variant as stated in the post.

I think Klaus is right regardless.
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written by Fred, June 30, 2009
led lights are cool, they save a lot. just not always bright.

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