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Over-voltage over-current protector

2016-09-22 06:43  
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Over-voltage over-current protector
In the normal working hours, Tr1 and Tr2 are cut-off, 555 is reset, and the discharge transistor of the 555 is conducted, it absorbs the current from Tr3's base electrode to make Tr3 saturated, the 5~12V power directly sends to the main load. When the load absorbs too much current, Rsc's pressure drop increases, the Tr1 conducts and 555 is triggered, so the internal discharge transistor cuts off, then the Tr3. At this time, the 555 is in the single stable state, when the single stable time is up, as long as the load over-flow phenomena is not ruled out, 555 will be triggered again, Tr3 will continue separate the load.