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. 24, 1992
Filed:
Feb. 11, 1991
Applicant:
Inventors:
Mai X Tu, Ecublens, CH;
Michel Schwab, Bienne, CH;
Assignee:
Detra SA, Bienne, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318685 ;
Abstract
The method and circuit are particularly suitable for use in timepieces and are adapted to supply the motor with chopped-voltage pulses of variable durations as a function of the load conditions of the motor. A chopped pulse of variable duration T.sub.7 is composed of a partial pulse T.sub.4 of fixed duration and of a constant number of partial pulses T.sub.6i of variable duration, spaced by intervals T.sub.5i which are themselves determined by the duration of current drop between the preceding peak and a reference value. The durations T.sub.6i are proportional to the intervals T.sub.5i.