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:
Nov. 18, 2014
Filed:
Sep. 20, 2010
Hiroaki Tanihara, Chiyoda-ku, JP;
Shuichi Matsumoto, Chiyoda-ku, JP;
Masao Motonobu, Chiyoda-ku, JP;
Hiroaki Tanihara, Chiyoda-ku, JP;
Shuichi Matsumoto, Chiyoda-ku, JP;
Masao Motonobu, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Initial calibration is performed only under normal-temperature environment, and accurate current control is performed under practical use temperature environment. A temperature sensoris arranged close to a current detection resistorhaving predetermined temperature characteristics. Resistance values are estimated in a calibration environment and a practical use environment, an actually measured load current in the calibration environment corresponding to a target load current is stored as control characteristic data, a corrected target current corresponding to the target load current is calculated, and a converted target current based on a change ratio of current detection resistance is controlled as a target current for current control. A resistance change amount by heat generation of the current detection resistorwhich cannot be entirely detected by the temperature sensoris corrected in control characteristic data, such that linearity of control characteristics is improved.