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:
Jul. 30, 1996
Filed:
Jan. 24, 1995
Hideki Yorozu, Takizawa-mura, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Sanken Electric Co., Ltd., Saitama, JP;
Abstract
A driving circuit for a stepping motor comprises bridge circuits being composed of switching elements connected between a DC power source and the coils of a stepping motor, rectifier diodes connected in antiparallel to the switching elements, capacitors connected in parallel to the bridge circuits, and constant voltage diodes connected between the DC power source and junction points of the bridge circuits and the capacitors. The switching elements are constituted to be ON/OFF controlled by a predetermined exciting system, and the constant voltage diodes are set to turn conductive to form a feedback circuit even if they are in a biased state in the reverse direction when the capacitors are charged up to a voltage which is higher than the source voltage and lower than the breakdown voltage of the switching elements by the counter electromotive force induced in the coils.