Wide Range Duty Cycle Grid Electrode Isolated Driving Circuit

Published:2011/8/18 5:46:00 Author: | Keyword: Wide, Duty Cycle, Grid, Electrode, Isolated, Driving | From:SeekIC

The picture shows the wide range duty cycle grid electrode isolated driving circuit by using the pulse transformer. In the circuit, the transformer T1's inductance and resistance R1 make up the differential circuit which would generate the power MOSFET's grid electrode driving voltage. If the transformer T1's secondary side generating the positive polar pulse (which means the high side is positive and the low side is negative), the VD1 would be conducted and charge the keeping capacitance CH and VF1's input capacitance Ciss. At this time the VT1's leakage current between grid electrode and the source electrode is very small. So even the input differencial pulse voltage is 0V, it would also keep the charging voltage.



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