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Grid Electrode Driving Circuit Composed Of Two Transistors

2016-05-06 15:55  
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Grid Electrode Driving Circuit Composed Of Two Transistors
The picture shows the grid electrode driving circuit composed of VT1 and VT2 which are in the emitter follower working mode. For the power MOSFET whose drain electrode's power consumption of 100~150W, its input capacitance Ciss is thousands of pF. When the voltage UDS between drain electrode and source electrode is closing 0V, the input capacitance would increase and be more. So as the loading capacitance of the grid electrode driving circuit, the C1 is normally be 10000pF (about 0.01uF). The picture shows the grid electrode driving circuit. When the transistor VT1 is conducted it would charge the capacitor CL. When the transistor VT2 is conducted it would discharge the electricity stored by the grid electrode. The RG would limit the peak current of the charging and discharging.