Invention Grant
- Patent Title: Driving circuit for stepping motor, method of driving stepping motor, and electronic device using the same
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Application No.: US16788692Application Date: 2020-02-12
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Publication No.: US11381184B2Publication Date: 2022-07-05
- Inventor: Hiroki Hashimoto , Masanori Tsuchihashi , Mitsuo Okada , Ryota Kobayashi
- Applicant: ROHM CO., LTD.
- Applicant Address: JP Kyoto
- Assignee: ROHM CO., LTD.
- Current Assignee: ROHM CO., LTD.
- Current Assignee Address: JP Kyoto
- Agency: Cantor Colburn LLP
- Priority: JPJP2019-025185 20190215
- Main IPC: H02P8/12
- IPC: H02P8/12

Abstract:
There is provided a driving circuit for a stepping motor, including: a counter electromotive force detection circuit configured to detect a counter electromotive force generated in a coil; a current value setting circuit configured to generate a current set value based on the counter electromotive force; a constant current chopper circuit configured to generate a pulse-modulated signal which is pulse-modulated so that a detected value of a coil current flowing through the coil approaches a target amount based on the current set value; and a logic circuit configured to control a bridge circuit connected to the coil according to the pulse-modulated signal, wherein the driving circuit is configured to output the current set value to outside or to access the current set value from the outside.
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