Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-05-15
2007-05-15
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S117000, C702S124000, C324S500000, C324S415000, C324S719000, C361S090000, C361S079000, C327S427000, C327S437000
Reexamination Certificate
active
11171789
ABSTRACT:
Apparatus for detecting failure of an isolation device includes a current sensor to sense current through the isolation device and a circuit responsive to the current sensor output signal and to an enable signal that controls the isolation device for providing an Early Failure Warning (EFW) signal indicative of whether the isolation device has failed. The enable signal is at a first logic level when the isolation device is on and is brought to a second logic level to disable and test the isolation device. Also described is a method of detecting a failure of an isolation device including disabling the isolation device, sensing a current through the isolation device, and providing an EFW signal indicating that the isolation device has failed if the current through the isolation device is greater than a predetermined level when the isolation device is disabled.
REFERENCES:
patent: 5448441 (1995-09-01), Raposa
patent: 5528445 (1996-06-01), Cooke et al.
patent: 5726997 (1998-03-01), Teene
patent: 6612502 (2003-09-01), Poucher
patent: 6615146 (2003-09-01), Malik et al.
Allegro Microsystems Inc.
Daly, Crowley & Mofford & Durkee, LLP
Desta Elias
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