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. 24, 1998
Filed:
Jun. 05, 1996
Hirohide Sato, Toyokawa, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An exciting current controlling transistor or a high-side switch or low-side switch of a three-phase full-wave rectifier for an on-vehicle a.c. generator is formed of a MOS power transistor made of a monocrystalline SiC semiconductor. Further, at high output condition time, for example, a state wherein the generator is in a condition of low temperature and a battery capacity is decreased, a controller suppresses the duty ratio of the exciting current controlling transistor to thereby limit a field coil exciting current. As a result, an increase in cross-sectional area of the electric wire or a temporary rapid increase in torque of the engine load is avoided. Also, by limiting the rate of increase in the duty ratio, the controller prevents a fall in the engine speed.