Method and apparatus for determining the switching state of...

Details Method and apparatus for determining the switching state of... Method and apparatus for determining the switching state of...

2006-02-28

2006-02-28

Nguyen, Vinh P. (Department: 2829)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S1540PB

Reexamination Certificate

active

07005882

ABSTRACT:
A method for determining the switching state of a transistor having an insulated drive electrode. The drive electrode is charged during a switch-on cycle depending on a drive signal and is discharged during a switch-off cycle depending on the drive signal. The transistor turns on or turns off depending on the charge stored on the drive electrode. The temporal profile of a charging and discharging current of the drive electrode or the temporal profile of the charge stored on the drive electrode is evaluated in order to determine the switching state. A state signal dependent on the switching state is provided, as is an apparatus for carrying out this method.

REFERENCES:
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patent: 5783998 (1998-07-01), Nakajou et al.
patent: 5872460 (1999-02-01), Bennett et al.
patent: 5959464 (1999-09-01), Qualich
patent: 6664801 (2003-12-01), Palusa
patent: 6756806 (2004-06-01), Yang et al.

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