| 摘要 |
The present invention provides an overpower-protection circuit (30,40) and a power supply apparatus (3,4) having the same. The power supply apparatus comprises a rectifier (12), a transformer (14) and an overpower-protection circuit (30,40). The overpower-protection circuit comprises a IC chip (302,402) having a first IC chip input (Vcc) electronically coupled to the rectifier and a second converter input, a photo coupler (304,404) having at least a first output terminal (collector) coupled with the second converter input, and having a second output terminal (emitter), and a clipper (312,412) electrically coupled across said terminals of the photo coupler for keeping the converter input below a predetermined voltage.
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