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:
Oct. 17, 1978
Filed:
May. 13, 1977
Applicant:
Inventor:
Jerome A Frazee, Milpitas, CA (US);
Assignee:
Fairchild Camera and Instrument Corporation, Mountain View, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318326 ; 318341 ;
Abstract
A closed loop D.C. motor speed control circuit compares tachometer feed-back signals proportional to the D.C. motor speed with a voltage reference representing the desired motor speed and generates pulses for controlling a variable duty cycle switch in the motor circuit for maintaining a constant speed irrespective of line voltage variations and load changes.