The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2006
Filed:
Oct. 07, 2004
Kouichi Yamamoto, Shizuoka, JP;
Satoshi Ishikawa, Shizuoka, JP;
Kenji Uchida, Aichi, JP;
Toshihiro Katsuta, Aichi, JP;
Kouichi Yamamoto, Shizuoka, JP;
Satoshi Ishikawa, Shizuoka, JP;
Kenji Uchida, Aichi, JP;
Toshihiro Katsuta, Aichi, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
An insulation resistance drop detectorand a method of detecting a state of malfunction of the detectorare provided. When open of a coupling capacitor Co or malfunction of a lowpass filteris occurred, a time constant of the low pass filteris decreased and a rising time of an output of the lowpass filteragainst an output of a pulse signal Pbecomes shorter than that in a state of normal. Thereby, malfunction of the detectorcan be detected based on the output of the filtercorresponding to change of frequency of the pulse signal P