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. 20, 2001
Filed:
Oct. 04, 2000
Kiyoshi Nishimura, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A control drive circuit or the like is provided that is capable of producing a drive output of a higher voltage than a drive power source voltage. A differential amplifier,that constitutes a differential amplifying section,generates a current Ia on the basis of a current I,obtained with a constant current generating section,and signal waveforms Vina and Vinb inputted from a signal source S. Currents I,and I,are generated with a pre-drive section,The current I,corresponds to part of the current Ia that is greater than 1/2·I,and smaller than 3/4·I,The current I,corresponds to part of the current Ia that is greater than 3/4·I,In other words, part of the current Ia that is greater than 1/2·I,is divided at the threshold value of 3/4·I,to obtain the currents I,and I,Different coils are driven on the basis of the currents I,and I,A drive output of a higher voltage than a drive power source voltage is obtained by synthesizing the outputs produced with the coils.