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11th May 2009, 09:03 AM
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#1 |
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diyAudio Member
Join Date: Nov 2007
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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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11th May 2009, 02:20 PM
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#2 |
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diyAudio Member
Join Date: Jan 2002
Location: The 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. Bakmeel
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