Voltage Driving MOSFET Grid Electrode Principle Circuit

Published:2011/8/17 7:01:00 Author: | Keyword: Voltage, Driving, MOSFET, Grid, Electrode, Principle | From:SeekIC

The MOSFET grid electrode driving principle circuit by using the current transformer secondary winding induced voltage is shown in the picture. The current would firstly circulate through the MOSFET parasitic diode. So the current transformer secondary winding would generate the induced voltage. When this voltage is beyond the threshold voltage, it would charge the MOSFET grid electrode. And the current would be conducted through MOSFET channel. Firstly the current which through the parasitic diode would generate the voltage drop about 1V. But when it is through the MOSFET channel, only its conducted resistance would generate a low voltage drop and there are no other voltage drop. That is the synchronous rectification. The principle circuit in the picture can not be used in the high-speed switching rectifier without any changing.



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