Cheap power inverter

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psycho
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Cheap power inverter

Post by psycho » Thu Mar 18, 2010 4:54 pm

My wife was using a 200 watt Whistler inverter in the car to charge her laptop battery. I wasn't there when it happened but it started whining (like a TV does when something goes awry). Smells a little bit, too. I am thinking that it is one or more mosfets that are overheating. But, it seems like the unit still works. I would expect that sooner or later - even if not electrically abused - it will fail.

Thoughts?

Kevin

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Bob Scott
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Re: Cheap power inverter

Post by Bob Scott » Thu Mar 18, 2010 5:15 pm

I can just guess.

I guess that the transformer overheated and now has a shorted winding. The overload is causing the oscillator to drift lower in frequency so that now you can hear it.
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psycho
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Re: Cheap power inverter

Post by psycho » Thu Mar 18, 2010 6:08 pm

I will have to do some tests on it and post some more info.

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MrAl
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Re: Cheap power inverter

Post by MrAl » Fri Mar 19, 2010 12:02 pm

Hi,


Yeah, that is a good idea. If you can look at the output waveform and report that back here we can
take a look too and maybe offer some advice.
LEDs vs Bulbs, LEDs are winning.

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