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:
Mar. 24, 2011
Tatsuro Shimizu, Kyoto, JP;
Hiroyuki Ishii, Kyoto, JP;
Nobuo Komura, Kyoto, JP;
Toshiya Suzuki, Kyoto, JP;
Tatsuro Shimizu, Kyoto, JP;
Hiroyuki Ishii, Kyoto, JP;
Nobuo Komura, Kyoto, JP;
Toshiya Suzuki, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
First and second A/D converters perform analog/digital conversion of first and second signals of a Hall signal so as to generate third and fourth signals as digital signals. A differential conversion circuit generates a fifth signal as a single-ended signal that corresponds to the difference between the third and fourth signals. An offset correction circuit corrects offset of the fifth signal so as to generate a sixth signal. An amplitude control circuit stabilizes the amplitude of the sixth signal to a predetermined target value, and generates its absolute value, thus generating a seventh signal. A control signal generating unit generates a control signal based upon the seventh signal. A driver circuit drives a motor according to the control signal.