ANORDNUNG ZUM BEFREIEN EINES HALBLEITERSCHALTERS VOR HOHER SPERRSPANNUNGSBEANSPRUCHUNG SOWIE ANWENDUNG HIERZU.

摘要

The snubber circuit comprises a diode (D2) providing a freewheel path from an inductive load (U) to a capacitor (C1). A further diode (D1) in the current path between the power source (Q), the load (U) and the switch to be protected (T1) is polled to allow load current to flow. A further switch (T2) couples the capacitor (C1) to the junction of the further diode (D1) and the load (U). For switching on the further switch (T2), there may be provided an auxiliary transformer with its primary in the control line to the switch (T1) and its secondary coupled to a driver stage for the further switch, such that both switches may simultaneously conduct.