CH635722B - WATCHMAKING PART INCLUDING A STEP MOTOR DETECTION AND CONTROL CIRCUIT. - Google Patents
WATCHMAKING PART INCLUDING A STEP MOTOR DETECTION AND CONTROL CIRCUIT.Info
- Publication number
- CH635722B CH635722B CH813779A CH813779A CH635722B CH 635722 B CH635722 B CH 635722B CH 813779 A CH813779 A CH 813779A CH 813779 A CH813779 A CH 813779A CH 635722 B CH635722 B CH 635722B
- Authority
- CH
- Switzerland
- Prior art keywords
- detector circuit
- load current
- rotor
- amplifier
- points
- Prior art date
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
Abstract
An electronic timepiece comprises a stepping motor driven by alternating square wave pulses, and a detector circuit for detecting the non-rotation condition of the rotor. The detector circuit is responsive to motor load current and looks for the presence of points A, B or C in the load current waveform curve 3 Fig. 1 which indicates normal rotatable condition. If the rotor has missed a step or the load is excessive such that these points are not detected, the load current being as waveforms curves 1, 2 Fig. 1, the detector circuit output is used to progressively adjust drive pulse duration accordingly as in Fig. 7 arrangement, or to make up for lost steps as in Fig. 6 arrangement. The detector circuit comprises an amplifier 24 including MOS transistors 1, 2 (eg as in Fig. 2) and a capacitor 3. Voltage applied to the amplifier is proportional to and has the same waveform as the motor drive current. <IMAGE>
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH813779A CH635722B (en) | 1979-09-10 | 1979-09-10 | WATCHMAKING PART INCLUDING A STEP MOTOR DETECTION AND CONTROL CIRCUIT. |
GB8027986A GB2059648B (en) | 1979-09-10 | 1980-08-29 | Electronic timepiece with stepping motor |
FR8018929A FR2465229A1 (en) | 1979-09-10 | 1980-09-02 | WATCH PIECE HAVING A DETECTION AND CONTROL CIRCUIT FOR A STEP BY STEP MOTOR |
DE3033350A DE3033350C2 (en) | 1979-09-10 | 1980-09-04 | Timepiece with a detection and control circuit for the stepper motor |
JP12522780A JPS56111485A (en) | 1979-09-10 | 1980-09-09 | Watch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH813779A CH635722B (en) | 1979-09-10 | 1979-09-10 | WATCHMAKING PART INCLUDING A STEP MOTOR DETECTION AND CONTROL CIRCUIT. |
Publications (2)
Publication Number | Publication Date |
---|---|
CH635722B true CH635722B (en) | |
CH635722GA3 CH635722GA3 (en) | 1983-04-29 |
Family
ID=4335723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH813779A CH635722B (en) | 1979-09-10 | 1979-09-10 | WATCHMAKING PART INCLUDING A STEP MOTOR DETECTION AND CONTROL CIRCUIT. |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS56111485A (en) |
CH (1) | CH635722B (en) |
DE (1) | DE3033350C2 (en) |
FR (1) | FR2465229A1 (en) |
GB (1) | GB2059648B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2900153B1 (en) * | 1998-02-10 | 1999-06-02 | セイコーインスツルメンツ株式会社 | Analog electronic clock |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53114467A (en) * | 1977-03-16 | 1978-10-05 | Seiko Instr & Electronics Ltd | Electronic watch |
JPS586400B2 (en) * | 1977-11-29 | 1983-02-04 | セイコーエプソン株式会社 | electronic clock |
JPS5477165A (en) * | 1977-12-02 | 1979-06-20 | Seiko Instr & Electronics Ltd | Electronic watch |
-
1979
- 1979-09-10 CH CH813779A patent/CH635722B/en unknown
-
1980
- 1980-08-29 GB GB8027986A patent/GB2059648B/en not_active Expired
- 1980-09-02 FR FR8018929A patent/FR2465229A1/en active Granted
- 1980-09-04 DE DE3033350A patent/DE3033350C2/en not_active Expired
- 1980-09-09 JP JP12522780A patent/JPS56111485A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE3033350A1 (en) | 1981-03-12 |
JPH0118398B2 (en) | 1989-04-05 |
JPS56111485A (en) | 1981-09-03 |
FR2465229A1 (en) | 1981-03-20 |
GB2059648A (en) | 1981-04-23 |
GB2059648B (en) | 1983-06-29 |
CH635722GA3 (en) | 1983-04-29 |
DE3033350C2 (en) | 1983-04-28 |
FR2465229B1 (en) | 1983-06-24 |
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