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. 04, 2013
Filed:
Jun. 08, 2010
Masahiro Nakamura, Kyoto, JP;
Masahiro Nakamura, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A cycle counter generates a cycle signal which indicates, in the form of a digital value, the cycle of Hall signals H+ and H− that indicate the position of a rotor of a motor to be driven. An up/down counter repeatedly alternates between counting 'up' and counting 'down' upon detecting phase transitions that occur in the Hall signals, and generates a digital driving waveform signal having a sloping region the slope of which is set according to the cycle signal. A D/A converter receives the driving waveform signal, and converts the driving waveform signal thus received into an analog voltage. A driving unit supplies a driving voltage to the motor according to the analog voltage thus received.