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:
Feb. 22, 2022
Filed:
Mar. 28, 2019
Seiko Epson Corporation, Tokyo, JP;
Takashi Kawaguchi, Shiojiri, JP;
Abstract
A motor control circuit includes a driver having ON and OFF states, and outputs a drive signal to a coil of a motor, a lower limit detector detecting whether current flowing through the coil is less than a lower limit, an upper limit detector detecting whether current flowing through the coil is more than an upper limit, a drive controller placing the driver into the ON state based on a detection result in the lower limit detector after the driver is brought into the OFF state, and placing the driver into the OFF state when the upper limit detector detects that the current is more than the upper limit after a predetermined time elapses from the driver being placed in the ON state, and a polarity switcher switching a polarity of the drive signal when an OFF time of the driver satisfies a polarity switching condition.