![]() ![]() When Q1/Q4 is ON, Q2/Q3 is OFF, and vice versa. For instance the pairs Q1/Q4 and Q2/Q3 are together switched ON/OFF, alternately. And this is cycled alternately for the diagonal pairs. To implement this the diagonally arranged mosfets are switched ON/OFF simultaneously. Meaning, to create an alternating push-pull current across the connected transformer winding. The main function of this mosfet topology is to switch the "load" or the transformer primary in this diagram, in a flip-flop manner. The following image shows a standard n-channel H-bridge configuration Commonly these are n-channel mosfets (4 p-channel is never used due to obvious reasons). We will try to understand the details through a step by step explanation.Ī bootstrapping network becomes necessary only when all the 4 devices in the H-bridge are identical with their polarity. ![]() Without bootstrapping facility an H-bridge topology with identical mosfets simply won't work. Meaning, if the drain voltage is 100V, then the effective gate/source voltage must be 110V in order to enable the full transfer of the 100V from the drain to the source of the high side mosfet. It is a process in which the gate/source terminals of the high side mosfets are switched with a voltage that's at least 10V higher than its drain voltage. Bootstrapping is a crucial aspect that you will find in all H-bridge or full bridge networks with N-channel mosfets. ![]()
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January 2023
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