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:
Jun. 30, 1998
Filed:
Jan. 28, 1997
Applicant:
Inventors:
Mai Xuan Tu, Ecublens, CH;
Michel Schwab, Bienne, CH;
Assignee:
Detra SA, Bienne, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; H02P / ;
U.S. Cl.
CPC ...
368157 ; 318696 ;
Abstract
The method and the device for feeding a single-phase stepping motor for a timepiece are adapted to provide the motor (M) with a sequence of chopped voltage pulses of variable duration as a function of load conditions and of feed voltage. The sequence of chopped voltage pulses comprises in particular a supplementary sequence of partial voltage pulses of constant duration (T.sub.4), separated from each other by variable intervals (T.sub.5i) defined by a reference current (I.sub.ref) whose value is adapted as a function of the level of load of the motor.