Method and circuit for detecting the state of a switch

Details Method and circuit for detecting the state of a switch Method and circuit for detecting the state of a switch

2005-03-01

2005-03-01

Trieu, Van T. (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S644000, C340S661000

Reexamination Certificate

active

06861955

ABSTRACT:
A circuit for detecting the state of a switch having a first circuit which substantially periodically attempts to provide a voltage across the switch. A second circuit detects the state of the switch by monitoring the voltage across the switch, and responsively generates an output having a voltage level representative of the voltage appearing across the switch.

REFERENCES:
patent: 4467391 (1984-08-01), Refoy et al.
patent: 4849847 (1989-07-01), McIver et al.
patent: 5689209 (1997-11-01), Williams et al.
patent: 5966311 (1999-10-01), Stemporzewski et al.
patent: 6590440 (2003-07-01), Williams et al.
patent: 6614288 (2003-09-01), Dagan et al.
patent: 6678829 (2004-01-01), Teggatz et al.
patent: 6759812 (2004-07-01), Ito et al.

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