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. 18, 2013
Filed:
Jun. 22, 2012
Masatoshi Murata, Miyagi-ken, JP;
Manabu Tamura, Miyagi-ken, JP;
Shinji Mitsuya, Miyagi-ken, JP;
Hiroyuki Hebiguchi, Miyagi-ken, JP;
Masatoshi Murata, Miyagi-ken, JP;
Manabu Tamura, Miyagi-ken, JP;
Shinji Mitsuya, Miyagi-ken, JP;
Hiroyuki Hebiguchi, Miyagi-ken, JP;
Alps Green Devices Co., Ltd., Tokyo, JP;
Abstract
A current sensor includes a magnetic balance sensor and a switching circuit. The magnetic balance sensor includes a feedback coil which is disposed near a magnetic sensor element varying in characteristics due to application of an induction field caused by measurement current and which produces a canceling magnetic field canceling the induction field. The switching circuit switches between magnetic proportional detection and magnetic balance detection. The magnetic proportional detection is configured to output a voltage difference as a sensor output. The magnetic balance detection is configured to output, as a sensor output, a value corresponding to current flowing through the feedback coil when a balanced state in which the induction field and the canceling magnetic field cancel each other out is reached after the feedback coil is energized by the voltage difference.