EP1014230B1 - Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie - Google Patents

Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie Download PDF

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Publication number
EP1014230B1
EP1014230B1 EP19980123823 EP98123823A EP1014230B1 EP 1014230 B1 EP1014230 B1 EP 1014230B1 EP 19980123823 EP19980123823 EP 19980123823 EP 98123823 A EP98123823 A EP 98123823A EP 1014230 B1 EP1014230 B1 EP 1014230B1
Authority
EP
European Patent Office
Prior art keywords
circuit
timepiece
thermal compensation
generator
voltage
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
EP19980123823
Other languages
English (en)
French (fr)
Other versions
EP1014230A1 (de
Inventor
Alain Zaugg
Pierre-André Farine
Jean-Pierre Wattenhofer
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.)
Frederic Piguet SA
Original Assignee
Frederic Piguet SA
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 Frederic Piguet SA filed Critical Frederic Piguet SA
Priority to DE69841366T priority Critical patent/DE69841366D1/de
Priority to EP19980123823 priority patent/EP1014230B1/de
Publication of EP1014230A1 publication Critical patent/EP1014230A1/de
Priority to HK00108378.5A priority patent/HK1029186A1/xx
Application granted granted Critical
Publication of EP1014230B1 publication Critical patent/EP1014230B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C10/00—Arrangements of electric power supplies in time pieces
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/08—Arrangements for preventing voltage drop due to overloading the power supply

Definitions

  • the present invention relates to a timepiece driven by a source of mechanical energy and, in particular, to such a timepiece whose operation is regulated by an electronic servocontrol circuit.
  • Such a timepiece is for example described in the Swiss patent CH 686 332 .
  • the source of mechanical energy comprising a mainspring, is mechanically coupled to the rotor of an electric energy generator so as to cause the rotor to rotate at a speed greater than a speed of rotation. set point.
  • This timepiece further comprises a servo-control circuit of the rotational speed of the rotor powered by the electrical energy supplied by the generator.
  • This servocontrol circuit includes a transistor that bypasses the generator coil and thus brakes the rotor to a speed below the set speed when a comparator indicates that the rotor is ahead of its angular position.
  • This timepiece has neither battery nor accumulator since the supply of its electronic circuits is provided by the electrical energy supplied by its generator whose rotor is connected to the source of mechanical energy constituted by the mainspring spring similar to that used in classic mechanical timepieces. This represents a clear advantage over a conventional electronic timepiece whose circuits are powered by a battery or accumulator whose life is limited.
  • the electronic circuits of the timepiece are powered by a DC voltage supplied by a circuit for rectifying the AC voltage produced by the generator.
  • the value of this DC voltage which depends on the value of the AC voltage, must obviously be permanently sufficient for the electronic circuits to work properly.
  • the timepiece described in this Swiss patent CH 686 332 has the same precision as a quartz movement timepiece by virtue of the fact that the generator is electrically slaved with respect to reference pulses produced by reference means comprising a quartz oscillator.
  • the quartz oscillator equipping this timepiece typically has deviations due to changes in ambient temperature. This causes an instability of the reference means which has repercussions on the enslavement of the timepiece and thus affects the accuracy of the operation thereof.
  • An object of the present invention is thus to overcome this disadvantage and thus to propose a timepiece of the type described in the patent CH 686 332 whose accuracy of walking is improved.
  • the electrical energy supplied by the generator of the timepiece according to the present invention being limited, it is also necessary to ensure that the timepiece, and in particular its electronics is constantly and sufficiently powered. Indeed, the engagement of the electronics necessary to compensate for thermal variations causes an increase in the consumption of the electrical energy supplied by the generator. This increase can seriously compromise the operation of the enslavement of the timepiece.
  • Another object of the present invention is thus to ensure an adequate supply of the electronic circuits of the timepiece despite the increase in energy consumption necessary to compensate for thermal variations.
  • the present invention relates to the timepiece whose characteristics are listed in claim 1.
  • the solution recommended by the present invention thus makes it possible to improve the precision of the running of this timepiece while ensuring a correct and sufficient supply of its electronics.
  • FIG. 1 represents a simplified general diagram of a timepiece according to the invention. It should be noted that part of this diagram concerning the servo-control circuit of the speed of rotation of the generator of this timepiece will not be described in detail here, the person skilled in the art can easily build this servo device by referring to the patent description CH 686 332 cited in the preamble. However, to make the understanding of the present invention easier, the essential elements of the scheme and operation of this servocontrol circuit will be briefly recalled here.
  • the timepiece 1 comprises a mechanical energy source formed by a barrel 2 housing a spring 21 of the usual type in the watchmaking technique, manual or automatic winding.
  • the barrel 2 is mechanically coupled to the rotor 31 of an electric generator 3 via a gear train 4 symbolized by mixed lines.
  • Generator 3 comprises a coil 32 at terminals 3a and 3b from which an alternating voltage Ug is generated when rotor 31 is rotated, this rotor carrying one or more permanent magnets generating a magnetic field represented by an arrow on the figure 1 and with which the coil 32 is magnetically coupled.
  • the terminals 3a and 3b of the coil 32 are connected to a rectifying circuit 5 whose output terminals 5a and 5b provide a DC voltage Ua from the alternating voltage Ug and intended to supply the various electronic circuits of the room. watchmaking 1.
  • the rectifying circuit 5 will not be described in detail here, as it may be similar to any of the rectifying circuits well known to those skilled in the art. It should be mentioned in particular that the request for EP 0 848 306 describes an example of such a rectifying circuit for a timepiece of the type described in the patent CH 686 332 . In general, this rectifying circuit 5 comprises a filtering capacitor connected between its output terminals 5a and 5b and which has not been shown.
  • Needles 6 or any other conventional means of mechanical time display are mechanically coupled to the gear train 4 to allow the display of the current time.
  • One or more display devices attached to the date, the day and / or other time indications may optionally be provided.
  • the timepiece 1 also comprises a mechanism for setting the needles 6 and, where appropriate, for correcting the at least one additional display device, which has not been shown because it may be similar to any of the various mechanisms of this kind which are well known to those skilled in the art.
  • the rotational speed of the hands 6 is maintained at a constant mean value by means of a servocontrol circuit 7 of the rotational speed of the rotor 31 at a reference speed Vc.
  • the servo control circuit components 7 are designed to adjust the rotational speed of the rotor 31, so that the hands 6 rotate at the required speed of accurate time indication, when the rotor 31 rotates at the speed of rotation. setpoint Vc. This is for example seven revolutions per second.
  • the servo-control circuit 7 comprises an oscillator 71 controlled by a watch-type crystal 8 and a frequency divider. 72 with an adjustable division ratio reducing the frequency of this oscillator 71 to a value usable by a functional block 73 which controls the gate of a semiconductor component 74, for example an n-type MOS transistor.
  • this semiconductor component 74 when made conductive, allows to short-circuit the coil 32 and produce thus a braking effect on the rotational movement of the rotor 31 of the generator 3.
  • a braking control signal SF which flows on a line 75 between the functional block 73 and the gate of the semiconductor component 74 is of logic type and in the example shown, it is assumed that this signal is in the logic state. 0 "as the timepiece does not advance, that is to say as the average speed of the rotor 31 is less than the set speed Vc. Under these conditions, the semiconductor component 74 remains blocked and the rotor 31 is not braked.
  • the braking control signal SF may be formed of pulses of determined durations beginning at the beginning of each alternation. , for example positive, of the voltage Ug at the terminals 3a and 3b of the coil 32 as described for example in the Swiss patent CH 686 332 .
  • the alternations of the voltage Ug are detected by the functional block 73 on a line 76 connected between the terminal 3a of the coil 32 and the functional block 73.
  • this signal is the logic state "1" making the semiconductor component 74 conductive and braking the rotor 31.
  • the latter furthermore comprises, according to the present invention, a thermal compensation circuit 9 coupled to the frequency divider circuit 72 of the servocontrol circuit 7.
  • compensation 9 makes it possible to adjust the temperature of the step of the timepiece 1 by compensating for the influences of the temperature variations to which the quartz 8 is subjected.
  • Thermal compensation devices are known to those skilled in the art.
  • the EP 0 406 174 which describes an integrated temperature sensor that can easily be adapted to allow a thermal compensation measurement of a quartz.
  • the thermal compensation circuit 9 comprises a temperature sensor 91 sensitive to the surrounding temperature, a reference circuit 92 delivering a reference signal and an analog-digital converter 93 providing a digital quantity representative of the temperature.
  • the temperature sensor 91 and the reference circuit 92 respectively deliver signals at frequencies F T and F ref , the ratio of which is converted by the converter 93 into a number N T.
  • This number N T is integrated in the inhibit factor of the frequency divider 72 to allow adjustment of the frequency of the pulses delivered to the output of the frequency divider circuit 73.
  • the figure 2 allows to briefly expose the operating principle of the thermal compensation circuit 9 of the figure 1 of which further details can be found in the EP 0 406 174 .
  • the temperature sensor 91 and the reference circuit 92 produce signals at frequencies F T and F ref respectively. These signals are produced at the output of a current-controlled oscillator (CCO) 901.
  • This oscillator 901 is controlled by a switch device SW by currents I T and I ref .
  • two current sources respectively produce a current I T strictly proportional to the absolute temperature and a current I VBE decreasing linearly with the temperature such as the sum of currents I T and I VBE , when the switch device SW is closed, constitutes a reference current I ref .
  • the analog-digital converter 93 thus sequentially receives the two frequencies F T and F ref , in parallel with a frequency F CK emanating from a stage of the frequency divider circuit 72 of the servocontrol circuit 7.
  • the analog-digital converter 93 comprises a down-counter 931, a preselection counter 932, first and second zero detectors 933 and 934, a memory 935 and an interface circuit 936.
  • the function of the up-down counter 931 is to integrate, in one direction, the input frequency F T and then, in the other direction, the reference frequency F ref to zero. It plays the same role as the voltage integrator in a conventional dual-ramp converter.
  • the contents of this down-counter 931 is represented by a variable N M.
  • the preset counter 932 counts the frequency pulses F CK .
  • the content of this counter 932 represented by a variable N CK , is representative, at the end of the conversion, of the temperature according to a linear correspondence law.
  • the parameters of this law are adjusted in preselecting the counter 932 to a value -N ex before the first conversion phase, then to a value -N 0 before the second conversion phase, these two values -N ex and -N 0 being stored in the memory 935.
  • This value N CK is adapted and transmitted in the form of the digital quantity N T , via the interface circuit 936, in the frequency divider circuit 72 of the control circuit 7 so as to allow the adjustment of the factor of inhibition of the frequency divider circuit 72.
  • the thermal compensation circuit 9 just described is periodically switched on, for example every 8 minutes, for a determined duration in order to produce the value N T representative of the thermal compensation of the quartz.
  • this thermal compensation circuit 9 generates a substantial potential drop ⁇ V at the terminals of the rectifying circuit 5, which may result in an interruption of operation of the servocontrol circuit 7 which is no longer sufficiently powered.
  • the DC voltage Ua delivered across the rectifying circuit must thus be sufficient to ensure both the maintenance of the power supply of the control circuit 7 and to allow the measurement of thermal compensation by means of the thermal compensation circuit 9.
  • the timepiece is thus arranged so as to produce, for the purpose of the thermal compensation measurement, a increasing the DC voltage Ua allowing the servo circuits 7 and thermal compensation 9 to function properly.
  • the figure 3 schematically shows an illustration of the evolution of this DC voltage Ua shortly before, during and shortly after the heat compensation measurement.
  • the DC voltage delivered by the rectifier circuit is at a level Ua 1 .
  • This voltage Ua 1 or nominal voltage, is typically of the order of 1.3 V.
  • the timepiece is normally regulated according to the principle described in the preamble.
  • the level Ua min indicated in phantom indicates the minimum power level below which the servo circuit is no longer properly supplied. In practice, this minimum power level Ua min is of the order of 1 V.
  • the thermal compensation circuit 9 typically consumes 10 ⁇ A for a duration of approximately 450 ms (t CT in the figure 3 ) under 1.2 V minimum.
  • a load reserve Q of the order of 4.5 ⁇ As must thus be constituted so as to allow the measurement of thermal compensation. Since the known value of the capacitance of the rectification circuit is typically 10 ⁇ F, it follows that it can be estimated that the potential drop ⁇ V as a result of the thermal compensation measurement will be equal to 0.45 V.
  • the nominal voltage Ua 1 being 1.3 V, it is thus easy to see the difficulty of operating the thermal compensation circuit in this timepiece.
  • the generator Shortly before the thermal compensation measurement, ie at a time t 0 - ⁇ , the generator is thus left free and the supply voltage Ua increases to a level Ua 2 .
  • the supply voltage U a gradually decreases to reach, at the end of the thermal compensation measurement at time t 0 + t CT , the voltage level Ua 2 - ⁇ V , ie about 1.24 V.
  • a reserve of the order of 0.24 V is still available and the operation of the servocontrol circuit is ensured.
  • the timepiece returns to its normal operating mode until the next thermal compensation measurement.
  • the accuracy of the walking of the timepiece can thus be improved by the compensation of ambient temperature variations, while ensuring that the operation of the servo circuit is not compromised.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Claims (1)

  1. Zeitmessgerät mit:
    - einer mechanischen Energiequelle (2),
    - Zeitanzeigeorganen (6), welche mit besagter mechanischer Energiequelle (2) mechanisch gekoppelt sind,
    - einen Generator (3) zur Erzeugung elektrischer Energie, welcher ebenfalls mechanisch mit besagter mechanischer Energiequelle (2) gekoppelt ist und zur Bereitstellung einer Wechselspannung (Ug) über eine erste und zweite Ausgangsklemme (3a, 3b) ausgebildet ist,
    - eine Gleichrichterschaltung (5), die mit den ersten und zweiten Ausgangsklemmen des besagten Generators (3) verbunden und ausgehend von besagter Wechselspannung (Ug) zur Bereitstellung einer Gleichspannung (Ua) über zwei Ausgangsklemmen (5a, 5b) ausgebildet ist, und
    - eine Steuerschaltung (7), welche mit besagter Gleichspannung (Ua) beaufschlagt ist und zur Regulierung der Umdrehungsgeschwindigkeit des besagten Generators (3) mit einer vorgegebenen Geschwindigkeit (Vc) ausgebildet ist, welche durch die Anzeige der aktuellen Zeit durch besagte Zeitanzeigeorgane (6) bestimmt ist, die Steuerschaltung insbesondere Referenzmittel (71, 72) aufweist, die durch einen Quarz (8) gesteuert werden,
    wobei besagtes Zeitmessgerät dadurch gekennzeichnet ist, dass es unter anderem aufweist
    - eine mit besagter Steuerschaltung (7) gekoppelte thermische Ausgleichsschaltung (9), die ebenfalls mit besagter Gleichspannung (Ua) beaufschlagt ist, wobei die thermische Ausgleichsschaltung zum Justieren der Referenzmittel (71, 72) der besagten Steuerschaltung (7) zum Ausgleich des Einflusses der Temperatur auf besagten Quarz (8) vorgesehen ist,
    besagte thermische Ausgleichsschaltung (9) für ein periodisches Einschalten während einer vorgegebenen Zeitdauer (tCT) ausgebildet ist, das Zeitmessgerät zur Freigabe des besagten Generators (3) durch besagte Steuerschaltung kurz vor und während eines Einschalten der besagten thermischen Ausgleichsschaltung (9) derart ausgebildet ist, um eine Erhöhung der von besagter Gleichrichtungsschaltung (5) zur Verfügung gestellten Gleichspannung (Ua) zu ermöglichen, so dass diese Erhöhung zur Sicherstellung des Betriebs der Steuerschaltung (7) während des Einschaltens der besagten thermischen Ausgleichsschaltung (9) ausreichend ist.
EP19980123823 1998-12-15 1998-12-15 Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie Expired - Lifetime EP1014230B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69841366T DE69841366D1 (de) 1998-12-15 1998-12-15 Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie
EP19980123823 EP1014230B1 (de) 1998-12-15 1998-12-15 Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie
HK00108378.5A HK1029186A1 (en) 1998-12-15 2000-12-22 Timepiece having an electrical energy generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980123823 EP1014230B1 (de) 1998-12-15 1998-12-15 Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie

Publications (2)

Publication Number Publication Date
EP1014230A1 EP1014230A1 (de) 2000-06-28
EP1014230B1 true EP1014230B1 (de) 2009-12-09

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ID=8233139

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EP19980123823 Expired - Lifetime EP1014230B1 (de) 1998-12-15 1998-12-15 Zeitmessgerät mit Generator zur Erzeugung elektrischer Energie

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EP (1) EP1014230B1 (de)
DE (1) DE69841366D1 (de)
HK (1) HK1029186A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3629104B1 (de) * 2018-09-27 2021-05-12 The Swatch Group Research and Development Ltd Mechanische uhr umfassend eine elektronische vorrichtung zur regulierung der ganggenauigkeit der uhr

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE789976A (fr) * 1971-10-15 1973-02-01 Centre Electron Horloger Garde-temps
JPS5313468A (en) * 1976-06-22 1978-02-07 Seiko Epson Corp Timepiece with additional mechanism
US4448543A (en) * 1983-01-17 1984-05-15 Rockwell International Corporation Time-of-day clock having a temperature compensated low power frequency source

Also Published As

Publication number Publication date
HK1029186A1 (en) 2001-03-23
EP1014230A1 (de) 2000-06-28
DE69841366D1 (de) 2010-01-21

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