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:
Jun. 25, 2002
Filed:
Jan. 20, 2000
Shiro Nakagawa, Tokyo, JP;
Kazuyuki Itoh, Tokyo, JP;
Katsuaki Tanaka, Tokyo, JP;
Katsumi Yabusaki, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
It is an object of the invention to provide a current sensor apparatus that reduces measurement errors resulting from variations in a position of a current path passing through the space inside a magnetic yoke. The current sensor apparatus comprises a ring-shaped magnetic yoke ( ) surrounding a current path ( ), part of the yoke having a gap ( ), and a magnetic sensor element ( ) placed in the gap ( ) of the magnetic yoke ( ). The magnetic sensor element ( ) detects a magnetic field in the gap ( ) generated by a current flowing through the current path ( ) to measure the current flowing through the current path ( ). The current sensor apparatus further comprises a magnetic field interrupter ( ), placed between the current path ( ) and the gap ( ), for interrupting a magnetic field corresponding to a magnetic flux generated by the current passing through the current path ( ) and not passing through the magnetic yoke ( ), so that the magnetic field would not reach the magnetic sensor element ( ).