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:
Mar. 08, 1994
Filed:
Jul. 27, 1992
Applicant:
Inventors:
Kunio Seki, Hinode, JP;
Yasuhiro Nunogawa, Takasaki, JP;
Hirotaka Mochizuki, Fujioka, JP;
Makoto Kobayashi, Sayama, JP;
Makoto Goto, Takasaki, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering, Ltd., Kodaira, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60L / ; G05F / ; G05F / ; H05B / ;
U.S. Cl.
CPC ...
307 108 ; 323282 ; 323288 ; 3152 / ; 315307 ;
Abstract
When a current that flows into a power output element is greater than a predetermined value, pulse width-modulated signals are formed which vary in inverse proportion to the current value in order to drive the power output element. When an excess current flows into the power output element, therefore, the power output element is allowed to intermittently operate for only short periods of time, and the current can be decreased during the current-limiting operation.