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Old 16th February 2006, 11:01 AM   #1
AnhMT is offline AnhMT  Viet Nam
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Default Switching Transformmer.

Hi everyone.
When I repair the switching power supply, i listen a noise from the transformmer, and a ferit core is very hot, i perform to change the capacitor and resistor of OSC module but it don't change.
Please help me.
Thanks so much.
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Old 2nd March 2006, 12:48 AM   #2
testlab is offline testlab  United States
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Sounds like you have a short on the secondary side of the supply. Disconnect the output regulators one at a time, and see if the problem goes away.
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Old 15th March 2006, 05:59 PM   #3
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Default RC Swapping

Also, changing the R-C timing components changes the frequency. If you vary it too much, then the transformer will either saturate if too low a frequency is chosen, or suffer higher core losses if a higher frequency is chosen. Also, you would have to change the number of turns on the tranny. Since you're repairing and not designing, you pretty much don't want do anything with the tranny, so I would concur with testlab on disconnecting secondary-side components to see when the problem goes away.

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