Quasi-clamped Inductive Switching Behaviour of Power Mosfets
Turn off behaviour of power Mosfets with Quasi-clamped Inductive Switching (QIS) loads is analysed. In most real applications the main inductive load is clamped during turn off but there is enough unclamped inductance in the circuit to cause voltage spikes and avalanche breakdown. This is the QIS situation and occurs in almost all practical circuits from motor drives to inverters to VRMs. Analytical expressions are derived for turn off losses under QIS which take into account the unclamped inductance in the circuit, gate drive parameters and more importantly, the source inductance of the package.
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