Can I replace transformer drive with optocoupler in halfbridge smps? - diyAudio
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Old 11th May 2009, 09:03 AM   #1
lakone is offline lakone  Indonesia
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Default Can I replace transformer drive with optocoupler in halfbridge smps?

Hi, all. I am new in smps. Can I replace the driver transformer in halfbridge smps that drive the transistor with the opto coupler. The opto coupler would be fed directly from the controller IC ( TL494 ). Please give me suggestion on this. Thank you
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Old 11th May 2009, 02:20 PM   #2
Bakmeel is offline Bakmeel  Netherlands
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You will need to arrange a floating power supply on the gate-side of the tranformer you wish to replace. An optocoupler can not transfer any energy needed to turn your fets on or off, so a little bit of secondary power is mandatory.

Also, take into account that opto's usually have a longer latency time than transformers. If your converter uses Peak Current Control, this may become critical.

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