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diode protection circuit

2016-09-10 14:37  
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diode protection circuit
The protection circuit which utilizes commutation of diode and the characteristic of low forward-direction voltage drop is shown as picture a,b.Just as picture(a),VD1 will be conductive when output voltage is higher than input voltage;and when output voltage is less than input voltage,VD2 will be conductive in order to protect the power supply.VD2 adopts the Schottky diode whose forward-direction voltage drop is low.Picture(b) is a diode protection circuit in series.When output voltage is higher than power supply,VD1 will stop to protect the power suply.When the circuit is in normal operation,there is 0.6V forward voltage drop on VD1,and it will decrease the output voltage.Therefor,we can use output voltage of VD3 to compensate.