Method and circuit arrangement for limiting an overvoltage

Details Method and circuit arrangement for limiting an overvoltage Method and circuit arrangement for limiting an overvoltage

2008-01-01

2008-01-01

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

10797241

ABSTRACT:
In order to limit an overvoltage at a parallel circuit of IGBT (3) and freewheeling diode (7), an undesirable current spike is used to switch on the intrinsically turned-off IGBT (3′) during the presence of the current spike precisely to an extent such that a current which counteracts the overvoltage arises in the IGBT/freewheeling diode pair. The oppositely acting current reduces the current gradient in leakage inductances (Lσ) and reduces the undesirable induced overvoltages.

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