Invention Grant
- Patent Title: Stepping motor control circuit, movement, and analog electronic timepiece
- Patent Title (中): 步进电机控制电路,运动和模拟电子表
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Application No.: US14013146Application Date: 2013-08-29
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Publication No.: US09190941B2Publication Date: 2015-11-17
- Inventor: Saburo Manaka , Kenji Ogasawara , Kazumi Sakumoto , Keishi Honmura , Kosuke Yamamoto , Satoshi Sakai
- Applicant: SEIKO INSTRUMENTS INC.
- Applicant Address: JP
- Assignee: SEIKO INSTRUMENTS INC.
- Current Assignee: SEIKO INSTRUMENTS INC.
- Current Assignee Address: JP
- Agency: Adams & Wilks
- Priority: JP2012-197539 20120907; JP2013-146783 20130712
- Main IPC: G04C3/14
- IPC: G04C3/14 ; H02P8/38 ; H02P8/02 ; H02P8/16 ; H02P8/34

Abstract:
A rotation detection circuit detects an induced current flowing through a drive coil of a stepping motor in a detection section divided into a plurality of sections, and detects a rotation state of the stepping motor on the basis of a pattern indicating whether or not the induced current exceeds a predetermined reference value in each of the sections. A control unit selects a drive pulse corresponding to the rotation state detected by the rotation detection unit, and supplies a drive current to a drive coil to rotatably drive the stepping motor. The rotation detection unit carries out detection by selecting a detection direction of the induced current in the sections after the first section on the basis of whether or not the induced current exceeding each of a plurality of reference values is detected plural times in the first section.
Public/Granted literature
- US20140071795A1 STEPPING MOTOR CONTROL CIRCUIT, MOVEMENT, AND ANALOG ELECTRONIC TIMEPIECE Public/Granted day:2014-03-13
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