DE68900226D1 - CONTROL CIRCUIT FOR A STEPPER MOTOR, IN PARTICULAR FOR WATCHES. - Google Patents

CONTROL CIRCUIT FOR A STEPPER MOTOR, IN PARTICULAR FOR WATCHES.

Info

Publication number
DE68900226D1
DE68900226D1 DE8989101879T DE68900226T DE68900226D1 DE 68900226 D1 DE68900226 D1 DE 68900226D1 DE 8989101879 T DE8989101879 T DE 8989101879T DE 68900226 T DE68900226 T DE 68900226T DE 68900226 D1 DE68900226 D1 DE 68900226D1
Authority
DE
Germany
Prior art keywords
voltage
control circuit
pulses
watches
stepper motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE8989101879T
Other languages
German (de)
Inventor
Yves Guerin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebauchesfabrik ETA AG filed Critical Ebauchesfabrik ETA AG
Application granted granted Critical
Publication of DE68900226D1 publication Critical patent/DE68900226D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)

Abstract

The control circuit (19) receives a supply voltage (Vb) provided by a battery (7), and in response to a time-base signal (S3) it sends driving voltage pulses (Vm) to a stepping motor (5), the rotor of which causes the time (6) to be displayed. The driving pulses are also applied to the control circuit (19) which comprises an adjusting circuit (20), the function of which is to compare the voltage (Vm) of these pulses with a reference voltage (Vr) and to produce, in each pulse, interruptions, the duration and number of which are determined so as to keep the mean voltage of each pulse constant in the presence of a variation of the supply voltage. Under these conditions, the motor (5) is controlled by driving pulses of constant energy, whatever the voltage (Vb) of the battery (7). <IMAGE>
DE8989101879T 1988-02-12 1989-02-03 CONTROL CIRCUIT FOR A STEPPER MOTOR, IN PARTICULAR FOR WATCHES. Expired - Lifetime DE68900226D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH513/88A CH672043B5 (en) 1988-02-12 1988-02-12

Publications (1)

Publication Number Publication Date
DE68900226D1 true DE68900226D1 (en) 1991-10-02

Family

ID=4188724

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8989101879T Expired - Lifetime DE68900226D1 (en) 1988-02-12 1989-02-03 CONTROL CIRCUIT FOR A STEPPER MOTOR, IN PARTICULAR FOR WATCHES.

Country Status (5)

Country Link
EP (1) EP0327989B1 (en)
JP (1) JP2905856B2 (en)
CH (1) CH672043B5 (en)
DE (1) DE68900226D1 (en)
HK (1) HK142594A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0704774B1 (en) * 1994-04-06 1999-08-25 Citizen Watch Co., Ltd. Electronic timepiece
JP5265821B1 (en) 2013-01-28 2013-08-14 日本食品化工株式会社 Oil processed starch and method for producing the same
JP7066361B2 (en) * 2017-09-21 2022-05-13 セイコーインスツル株式会社 Clocks, electronic devices, and how to control clocks

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944872C2 (en) * 1979-11-07 1981-11-19 Gebrüder Junghans GmbH, 7230 Schramberg Arrangement for controlling a stepper motor for battery-operated devices
JPS5676078A (en) * 1979-11-28 1981-06-23 Citizen Watch Co Ltd Circuit for electronic time piece
US4383209A (en) * 1980-10-15 1983-05-10 Minnesota Mining And Manufacturing Company Control system for transducer positioning motor
JPS5979886A (en) * 1982-10-29 1984-05-09 Rhythm Watch Co Ltd Motor drive circuit of time piece
CH653206GA3 (en) * 1983-09-16 1985-12-31

Also Published As

Publication number Publication date
CH672043B5 (en) 1990-04-30
EP0327989A1 (en) 1989-08-16
JP2905856B2 (en) 1999-06-14
HK142594A (en) 1994-12-23
JPH01243891A (en) 1989-09-28
CH672043GA3 (en) 1989-10-31
EP0327989B1 (en) 1991-08-28

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition