Abstract
The main factors causing failures of composite power switches in the course of their turn-off transients are considered. The existing methods for reducing the dynamic overvoltages applied to the switch components are described, and the main drawbacks of these methods are pointed out. The mechanisms and peculiarities of the transient associated with turning off composite power switches are analyzed. A composite switch equivalent circuit that takes into account the parasitic components affecting the dynamic processes in the circuit as proposed. Analytical expressions for the voltages applied to the circuit elements determining the dynamic overloads in the circuit for oscillatory and aperiodic cases are obtained. Criteria for estimating whether composite power switches retain their blocking capability in switching are developed. The features pertinent to the turning off process of the basic switch element intended for its use in high-voltage circuits, the control principle of which is similar to that of a composite power switch designed for twice as high maximum permissible voltage, are studied. Criteria for estimating whether the basic switch element retains its blocking capability in switching processes are formulated. The advantages of the high-voltage basic switch element topology in dynamic switching modes are shown.
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