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:
Aug. 17, 1993
Filed:
Sep. 20, 1990
Applicant:
Inventor:
Yves Guerin, Grenchen, CH;
Assignee:
ETA SA Fabriques d'Ebauches, Grenchen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318685 ; 363 98 ;
Abstract
The control device is intended to supply a stepping motor with driving pulses during which the mean value of the voltage applied to the coil of this motor is independent from the voltage of the power supply source of the device. For that purpose, the control device comprises a driving circuit which connects or disconnects the coil of the motor to or from the power supply source when a control signal has a first state or a second state respectively, and a control circuit which produces this control signal with its first state or its second state in dependency on the difference between a reference voltage and the voltage across the coil.