Sensor circuit for detection of an abnormal offset voltage

Details Sensor circuit for detection of an abnormal offset voltage Sensor circuit for detection of an abnormal offset voltage

2006-08-08

2008-12-16

Gutierrez, Diego (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

C324S713000

Reexamination Certificate

active

07466119

ABSTRACT:
A sensor circuit includes an AC component pickup circuit and first and second adder circuits or first and second high-pass filters, and specifies a range of normal voltages by an upper-limit voltage formed by adding an upper-limit threshold value to the AC component in the input voltage and by a lower-limit voltage formed by adding a lower-limit threshold value to the AC component in the input voltage. An abnormal offset voltage is detected by judging whether the output voltage of an inverting amplifier circuit is lying in the range of normal voltages.

REFERENCES:
patent: 4398154 (1983-08-01), Lee
patent: 4801827 (1989-01-01), Metz
patent: 6246268 (2001-06-01), Cheng
patent: 6666090 (2003-12-01), Mori et al.
patent: 7129487 (2006-10-01), Hatatani et al.
patent: 2006/0077013 (2006-04-01), Tsuruhara et al.
patent: A-08-077714 (1996-03-01), None
patent: A-2001-304871 (2001-10-01), None

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