Diagnostic circuit for checking capacity of condenser

Details Diagnostic circuit for checking capacity of condenser Diagnostic circuit for checking capacity of condenser

1996-03-25

1998-09-22

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324548, 324519, 340436, G01R 3112

Patent

active

058119787

ABSTRACT:
A diagnostic circuit for checking a capacity of a backup condenser having a check circuit in which the clamp means includes a Zener diode and a transistor connected in parallel with the backup condenser and the current flowing through a charge resistor, the Zener diode and the transistor during a time B that the transistor is turned on by a microprocessor, results in the terminal voltage of the backup condenser to be clamped to a predetermined clamp voltage.

REFERENCES:
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patent: 3944853 (1976-03-01), Cooper
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patent: 4858055 (1989-08-01), Okitaka
patent: 5329174 (1994-07-01), Chiang
patent: 5461321 (1995-10-01), Sanders et al.
patent: 5479103 (1995-12-01), Kernahan et al.
patent: 5594349 (1997-01-01), Kimura
patent: 5646539 (1997-07-01), Codina
patent: 5677634 (1997-10-01), Cooke et al.

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