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Direct Driving Circuit

2015-01-02 20:59  
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Direct Driving Circuit
The most effective method to add reverse bias voltage is using the circuit in picture (a). In this circuit when the switch transistor VT3 is disconnected, the VT2 would be conducted and add the reverse voltage to the switch transistor VT3's base electrode. Even the pulse is narrow it could add enough reverse bias voltage. But it needs the reverse bias power U2. The VT2's power is using the circuit in picture (c). It could get the voltage U2 from the transformer tapping. The picture shows the direct driving circuit.