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:
Apr. 18, 1989
Filed:
Jul. 02, 1986
Yoshihiko Watanabe, Saitama, JP;
Tsuneyoshi Nagashita, Saitama, JP;
Susumi Niinuma, Saitama, JP;
Isamu Nomura, Saitama, JP;
Kimito Kobayashi, Saitama, JP;
Akio Namiki, Saitama, JP;
Hiroyuki Abe, Saitama, JP;
Takayuki Iijima, Saitama, JP;
Kazuto Shimokawa, Saitama, JP;
Akira Haeno, Saitama, JP;
Yoshio Aoyagi, Saitama, JP;
Toshiyuki Kimura, Saitama, JP;
Isao Matsumoto, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A pulse-width modulation drive circuit for a load such as a motor, particularly, a motor used in a compact disc player or the like, in which losses in diodes used to absorb reverse EMF are substantially eliminated. For this purpose, the pulse widths of pulse signals used to on-off control drive current flow through the load are controlled so as to eliminate the diode losses. The circuits of the various embodiments of the invention are designed so as to be easily implemented in integrated circuit form.