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:
Sep. 09, 2008
Filed:
Jun. 21, 2006
Mitsuhiko Watanabe, Odawara, JP;
Katsuya Oyama, Hitachinaka, JP;
Shoji Sasaki, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A motor control system which can realize current detection with high accuracy by using an amplifier having an ordinary level of accuracy and can avoid deterioration of current detection accuracy even when emperature is changed. The motor control system comprises a switch circuit for supplying a driving current to a motor, a resistor for detecting the driving current, an amplification circuit for amplifying a potential difference across the resistor, an input section switch unit disposed in an input section of the amplification circuit and changing over the potential difference to be forward biased or reverse biased, an output section switch unit disposed in an output section of the amplification circuit and changing over an output voltage of the amplification circuit to be forward biased or reverse biased, and a CPU for averaging a voltage produced when the output voltage of the amplification circuit is forward biased, and a voltage produced when the output voltage of the amplification circuit is reverse biased.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile