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Switching Power Supplies A - Z, 2nd Edition by Sanjaya Maniktala

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Chapter 8

Conduction and Switching Losses

This chapter starts by showing how the voltage and current waveforms change as we move from switching a pure resistive load to switching an inductive load. Equations for crossover loss are presented, based on a given crossover time. Next, the phases of the turn-on and turn-off switching transitions of a metal oxide semiconductor field effect transistor (MOSFET) are discussed in detail and all the corresponding equations are derived. It is also shown how to interpret a MOSFET datasheet correctly for inputting the required information into the equations and thereby correctly estimating the crossover time and the switching losses. Conduction loss calculations are also included. A detailed numerical example ...

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