Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2006-02-28
2006-02-28
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S503000, C324S509000, C324S551000, C340S647000
Reexamination Certificate
active
07005860
ABSTRACT:
An insulation resistance drop detector50and a method of detecting a state of malfunction of the detector50are provided. When open of a coupling capacitor Co or malfunction of a lowpass filter53is occurred, a time constant of the low pass filter53is decreased and a rising time of an output of the lowpass filter53against an output of a pulse signal P1becomes shorter than that in a state of normal. Thereby, malfunction of the detector50can be detected based on the output of the filter53corresponding to change of frequency of the pulse signal P1.
REFERENCES:
patent: 6906525 (2005-06-01), Suzuki
patent: H8-70503 (1996-03-01), None
Ishikawa Satoshi
Katsuta Toshihiro
Uchida Kenji
Yamamoto Kouichi
Dole Timothy J.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Nguyen Vincent Q.
Yazaki -Corporation
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