Push-Pull Switching Circuit With Grounding Source Electrode

Published:2011/8/23 23:39:00 Author:Robert | Keyword: Push-Pull, Switching, Grounding, Source, Electrode | From:SeekIC

In the large-power applications it usually uses the push-pull switching circuit with transformer middle tapping method. The picture shows the common-used push-pull circuit with grounding source electrode. The push-pull switching circuit's input and output's phase difference is 180°. But the switching power controller has the A phase and the B phase which also have the 180° phase difference, it could directly drive the push-pull switching circuit composed of power MOSFET. Also in no-load case the power MOSFET in the circuit would have a high voltage between its drain electrode and source electrode which would easily have breakdown. So the power MOSFET's withstand voltage must have enough surplus capacity, and also it needs the absorbing circuit to limit the surge voltage.



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