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RE: reduce heat in switching Power supply with half wave

Posted by Quest (A) on July 5, 2007 at 12:33:30

In Reply to: reduce heat in switching Power supply with half wave posted by wlee on July 5, 2007 at 12:06:36:

wlee-

switching power supply is no laughing matter so:

1) negatory. The post rectification part of the L-C filter is carefully calculated to attenuate the HF noise and "hash" with sufficient ripple filtering in mind. Casually manipulating the ultra-low ESR cap with boutique PIO caps (or simply lowering the capacitance) will simply not work (try if if you want)

2) negatory. you will damage the winding and ruin the HF ferrite core transformer.

Bottomline is that your TV switch-mode PSU may be built to a price point, so you may have one of those scenarios where the power transistor/fet does not have a large enough heat sink to handle the heat generated, or you may have a slightly undercapacity PSU to begin with.

For short term resolution, you may try adding a small computer DC fan to give it some fan-forced cooling. For long term solution, perhaps consider getting a better TeeVee unit or see if you can find a higher output switch mode power supply...

Q-TD

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