EP0848306B1 - Pièce d'horlogerie comportant une génératrice d'énergie électrique - Google Patents
Pièce d'horlogerie comportant une génératrice d'énergie électrique Download PDFInfo
- Publication number
- EP0848306B1 EP0848306B1 EP19960119747 EP96119747A EP0848306B1 EP 0848306 B1 EP0848306 B1 EP 0848306B1 EP 19960119747 EP19960119747 EP 19960119747 EP 96119747 A EP96119747 A EP 96119747A EP 0848306 B1 EP0848306 B1 EP 0848306B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output terminal
- generator
- voltage
- diode
- timepiece
- 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
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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C10/00—Arrangements of electric power supplies in time pieces
Definitions
- the present invention relates to a part electronic watchmaking and, in particular, to such room in which electrical energy is generated by a generator driven by a spring barrel.
- a timepiece with these characteristics which is described for example in the patent application Swiss no. 686 332, has the same precision as a part classic electronic watchmaking thanks to the fact that reference pulses, the frequency of which determines the rotational speed of the generator rotor and therefore that display hands for the current time, are produced from a signal supplied by an oscillator at quartz.
- this timepiece does not contain battery or accumulator since the supply of its electronic circuits is provided by energy electric supplied by its generator whose rotor is connected to its mechanical energy source, which is made up by a barrel spring similar to that which is used in mechanical timepieces classics.
- braking means of the generator rotor consist of a resistor connected in series with a switch electronics, the whole formed by this resistance and this switch being connected in parallel with the coil the generator.
- this switch is controlled directly by the comparison signal so as to be closed regularly when the latter is in its first state, i.e. as long as the generator rotor is ahead of the position he would occupy if he had always been running at its set speed.
- Electronic circuits of the timepiece are supplied by a DC voltage supplied by a rectification circuit of the alternating voltage produced by the generator.
- the rotor of the generator can be braked continuously for one quite long time. It is therefore practically excluded from choose a zero value for the braking resistor, because the rectifier circuit capacitor should then have a very high capacity and therefore should be enough bulky and expensive. Besides, it would not be possible to determine with certainty the ability that this capacitor should have since the maximum time during which the generator rotor can be braked does not cannot be planned in advance.
- the voltage alternative produced by this coil is decreased by one because of the decrease in rotation speed which results from this connection and, on the other hand, because of the voltage drop produced in the generator coil by the current absorbed by the braking resistor.
- the braking torque applied to the rotor of the generator is higher as the value of the braking resistance is low, this braking torque being maximum when this braking resistor has a null value.
- This braking torque must obviously impose on the generator rotor a rotation speed lower than its target speed regardless of the engine torque supplied by the barrel spring.
- this engine torque can be as high as possible, which influences favorably the autonomy of the timepiece, i.e. the time during which it can operate without that its barrel spring must be reassembled, it is necessary so that the braking torque is also high, this which implies that the braking resistor has a value low.
- this resistance should have a null value.
- the rotor braking resistor must therefore fill two contradictory conditions. On the one hand, it must be high enough, and in any case not zero, to that the supply voltage of electronic circuits is sufficient in all circumstances. On the other hand, it must be low enough, and preferably zero, to the braking torque is high and the speed of rotor rotation, when braked, less than its set speed even when the engine torque provided by the mechanical energy source is maximum.
- a coil having a large number of turns of a small diameter wire has a high internal resistance which, on the one hand, is added to the braking resistor and decreases the torque by braking of the rotor and, on the other hand, causes a decrease in the alternating voltage produced by the generator when the current supplied by the latter.
- An object of the present invention is to provide a timepiece of the same kind as that described above but which does not have the disadvantages of this one, that is to say a timepiece in which the value of the rotor braking resistor may be very weak, or even zero, without being necessary to give the generator coil a high number of turns and without the risk of see, in any circumstance whatsoever, the tension supply of electronic circuits become insufficient for these to work correctly. Also, this very low value, or even zero, this braking resistor allows you to choose the barrel spring driving the rotor of the generator so that its maximum torque is high and that the autonomy of the timepiece is therefore more high, all other things being equal, than that of the known timepiece mentioned above.
- the invention therefore relates to a timepiece comprising a barrel, a spring housed in this barrel, time display devices mechanically coupled to this barrel, a generator of electrical energy coupled also mechanically to the barrel and being arranged at deliver through first and second terminals of output an alternating voltage, a rectification circuit connected to the first and second output terminals of the generator by two respective input terminals and being arranged to deliver through two output terminals one DC voltage from said AC voltage, and a regulator circuit supplied by the DC voltage and intended to control the speed of rotation of the generator so as to impose on the display organs a rotation speed corresponding to an indication correct for the current time.
- the timepiece is characterized in that the rectification circuit comprises a voltage doubler rectifier, connected to the first and second generator output terminals and being arranged to deliver through a first output terminal and a second output terminal a DC voltage of so the potential at this first output terminal be greater than the potential of this second terminal of output, a first capacitor and a first diode connected in series between the first output terminal of said voltage doubler rectifier and the first terminal of output of said generator, the first diode being oriented so as to allow the circulation of a current from the first rectifier output terminal voltage doubler at the first output terminal of the generator, and a second capacitor and a second diode connected in series between the first output terminal of the generator and the second output terminal of the voltage doubling rectifier, the second diode being oriented so as to allow the circulation of a current from the first generator output terminal to the second output terminal of the doubling rectifier voltage.
- the rectification circuit comprises a voltage doubler rectifier, connected to the first and second generator output terminals and being arranged to deliver through
- the rectification circuit is arranged to multiply the supply voltage by a even factor of at least four without requiring a number high bulky items. So the room timepieces according to the invention can have a value of the rotor braking resistance which is very low, without that it is necessary to give the coil of the generating a high number of turns and without there being a risk of seeing, under any circumstances whatsoever, the supply voltage of electronic circuits become insufficient for these to work correctly.
- Figure 1 represents a simplified general diagram of a part of watchmaking according to the invention. It should be noted that the part of this diagram concerning the regulator circuit intended to control the speed of rotation of the generator of this timepiece, will not described in detail here, the skilled person can without hardly build this slaving device while referring to the description of the Swiss patent application No 686 332 in the name of the Applicant patent application. However, to make it easier understanding of the present invention, it will be recalled briefly here the essential elements of the diagram and operation of this regulator circuit.
- the timepiece according to the invention comprises a mechanical energy source formed by a barrel 1 housing a spring 1a of the usual type in the art watchmaking, with manual or automatic winding.
- Barrel 1 is mechanically coupled to rotor 2a an electric generator 2 via a gear train 3 symbolized by mixed lines.
- Generator 2 includes a coil 2b at terminals B1 and B2 from which an alternating voltage is generated Ug, when the rotor 2a is rotated, this rotor being the bearer of one or more permanent magnet (s) generating a magnetic field symbolized by an arrow in Figure 1 and with which the coil 2b is coupled.
- the terminals B1 and B2 of the coil 2b are connected to a rectifier 4 whose output terminals 4a and 4b provide a continuous voltage Ua derived from the voltage Ug alternative and intended to supply the various circuits of the timepiece.
- Needles 5 or any other conventional means mechanical time display are coupled to the train gear 3 to allow time display current and possibly date and day and other time indications.
- the rotation speed of the hands 5 is maintained at a constant average value thanks to a circuit regulator 6 which controls this value at a speed of setpoint Vc.
- the regulator circuit components 6 are designed to adjust the speed of rotation of the rotor 2a, so that the 5 hands rotate at the required indication speed just an hour, when the rotor turns at the speed of setpoint Vc. This is for example seven turns per second.
- the servo circuit 6 includes an oscillator 7 stabilized by a watchmaking type quartz and a divider of frequency 8 reducing the frequency of this oscillator to a value usable by a functional block 9 which controls the grid of a semiconductor component 10, by example an n type MOS transistor.
- This semiconductor component when it is made conductive, allows to short-circuit this coil and thus have a braking effect on the movement of generator rotation 2.
- the brake control signal SF which circulates on a line 11 between the functional block 9 and the grid of the semiconductor component 10 is of logic type and in the example shown, we admit that this signal is in the state logic "0" as long as the timepiece delays, that is to say as long as the average speed of the rotor 2a is lower than the set speed Vc. In these conditions, the component or transistor 10 remains blocked and the rotor 2a is not braked.
- the brake control signal SF is made up of pulses of determined duration starting at the start of each alternation, for example positive, of the Ug voltage at terminals B1 and B2 of coil 2b. during each of these pulses of the control signal SF, this one is in state "1" making the transistor 10 conductive and braking the rotor 2a.
- FIG. 2 illustrates an embodiment according to the invention of the rectifier circuit shown in Figure 1.
- the rectifying circuit 4 comprises a rectifier voltage doubler 20, two diodes 21 and 22 and two capacitors 23 and 24.
- the voltage doubling rectifier 20 which is connected to the output terminals B1 and B2 of the generator, is arranged to deliver through two output terminals 20a and 20b a DC voltage Us so that the potential at the first output terminal 20a is greater than that of said second output terminal 20b.
- the voltage doubler rectifier 20 includes a capacitor 27 and a diode 25 connected in series between the first terminal B2 and the second output terminal B1 of the generator 2.
- the diode 25 is oriented so that allow circulation of the first B2 exit terminal to the second output terminal B1 of generator 2.
- the voltage doubling rectifier 20 includes a capacitor 28 and a diode 26 connected at series between the first output terminal B2 and the second output terminal B1 of generator 2.
- Diode 26 is oriented so as to allow circulation of the second output terminal B1 at the first output terminal B2 of generator 2.
- the anode of diode 25 is connected to the terminal of output of the voltage doubling rectifier 20a, while the cathode of diode 26 is connected to the output terminal of the voltage doubling rectifier 20b.
- the diodes 21, 22, 25 and 26 are preferably Schottky type or active type to limit loss of tension during their direct conduction.
- the voltage Us across the terminals of output 20a and 20b of the voltage doubler rectifier 20 is a DC voltage which has a value equivalent to Uc1 + Uc2 ⁇ 2Ug (if one neglects the losses of tension through diodes 25 and 26).
- the diode 21 and the capacitor 23 are connected in series between the output terminal 20a of the doubling rectifier of voltage 20 and the output terminal B2 of the generator 2.
- the diode 22 and the capacitor 24 are connected in series between the output terminal 20b of the rectifier voltage doubler 20 and the output terminal B2 of the generator 2.
- the diode 21 is oriented so that allow the circulation of a current from the terminal output 20a of the voltage doubler rectifier 20 at the terminal B2 of generator 2, while diode 22 is oriented so as to allow the flow of a current from the terminal B2 of generator 2 to output terminal 20b of voltage doubler rectifier 20.
- the voltage Ua across the terminals output 4a and 4b of the rectification circuit is a direct voltage which has a value equivalent to Uc3 + Uc4 ⁇ 4Ug.
- the arrangement shown in figure 2 has the advantage of requiring less AC voltage of generator 2. Therefore, generator 2 can be carried out with a smaller number of turns, which implies a lower manufacturing price.
- the rectification circuit 4 of the figure 2 does not require a large number of elements bulky. It can be seen in FIG. 2 that the capacitors 23 and 24 supply, across the terminals 4b and 4a, significant energy on the circuits of the timepiece, while the capacitors 27 and 28 are sort of used to transfer a load generated by generator 2 to capacitors 23 and 24. So, capacitors 27 and 28 do not need a large capacity and, in practical achievements carried out as part of the present invention, can even be integrated with electronic circuits.
- the capacitors 23 and 24 have each 2200 nF, while the capacitors 27 and 28 each have a value of only 100 nF. Of preferably, capacitors 27 and 28 have a capacity between 100 and 100 nF and the capacitors 23 and 24 have a capacity between 100 and 100 nF, a capacity 29 between 4a and 4b having 2200 nF.
Description
- la figure 1 montre un schéma général simplifié d'une pièce d'horlogerie selon l'invention, et
- la figure 2 est un schéma du circuit de redressement de la pièce d'horlogerie de la figure 1.
Claims (6)
- Pièce d'horlogerie comprenantun barillet (1),un ressort (1a) logé dans ce barillet (1),des organes d'affichage de l'heure (5) couplés mécaniquement à ce barillet (1),une génératrice d'énergie électrique (2) couplée également mécaniquement audit barillet (1) et étant agencée à délivrer à travers des première et deuxième bornes de sortie (B2,B1) une tension alternative (Ug),un circuit de redressement (4) connecté aux première et deuxième bornes de sortie de ladite génératrice (2) par deux bornes d'entrée respectives et étant agencé à délivrer à travers deux bornes de sortie (4a,4b) une tension continue (Ua) à partir de ladite tension alternative (Ug), etun circuit régulateur (6) alimenté par ladite tension continue (Ua) et destiné à asservir la vitesse de rotation de ladite génératrice (2) de manière à imposer auxdits organes d'affichage (5) une vitesse de rotation correspondant à une indication juste de l'heure courante, ladite pièce d'horlogerie étant caractérisée en ce que ledit circuit de redressement (4) comprendun redresseur doubleur de tension (20) connecté auxdites première et deuxième bornes (B2,B1) de sortie de la génératrice (2) et étant agencé à délivrer à travers une première borne de sortie (20b) et une deuxième borne de sortie (20a) une tension continue de sorte que le potentiel à cette première borne de sortie (20a) soit supérieur au potentiel de cette deuxième borne de sortie (2a),un premier condensateur (23) et une première diode (21) reliés en série entre ladite première borne de sortie (20a) dudit redresseur doubleur de tension (20) et la première borne de sortie (B2) de ladite génératrice (2), ladite première diode (21) étant orientée de manière à permettre la circulation d'un courant de ladite première borne de sortie (20a) dudit redresseur doubleur de tension (20) à ladite première borne de sortie (B2) de ladite génératrice (2), etun deuxième condensateur (24) et une deuxième diode (22) reliés en série entre ladite première borne de sortie (B2) de ladite génératrice (2) et ladite deuxième borne de sortie (20a) dudit redresseur doubleur de tension (20), ledit deuxième diode (22) étant orienté de manière à permettre la circulation d'un courant de ladite première borne de sortie (B2) de ladite génératrice (2) à ladite deuxième borne de sortie (20b) dudit redresseur doubleur de tension (20).
- Pièce d'horlogerie selon la revendication 1, caractérisée en ce que ledit redresseur doubleur de tension (20) comprendun troisième condensateur (27) et une troisième diode (25) reliés en série entre ladite première borne de sortie (B2) et ladite deuxième borne de sortie (B1) de ladite génératrice (2), ledit troisième diode (25) étant orienté de manière à permettre la circulation de ladite première borne de sortie (B2) à ladite deuxième borne de sortie (B1) de ladite génératrice (2), etun quatrième condensateur (28) et une quatrième diode (26) reliés en série entre ladite première borne de sortie (B2) et ladite deuxième borne de sortie (B1) de ladite génératrice (2), ledit quatrième diode (26) étant orienté de manière à permettre la circulation de ladite deuxième borne de sortie (B1) à ladite première borne de sortie (B2) de ladite génératrice (2).
- Pièce d'horlogerie selon la revendication 1 ou 2, caractérisée en ce que desdites diodes (21,22,25,26) sont du type Schottky ou du type active.
- Pièce d'horlogerie selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdits premier (23) et deuxième (24) condensateurs ont une capacité entre 100 et 2200 nF.
- Pièce d'horlogerie selon l'une quelconque des revendications 2 à 4, caractérisée en ce que lesdits troisième (27) et quatrième condensateurs (28) ont une capacité entre 10 et 100 nF.
- Pièce d'horlogerie selon la revendication 5, caractérisé en ce que lesdits troisième (27) et quatrième (28) condensateurs sont du type intégré.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19960119747 EP0848306B1 (fr) | 1996-12-10 | 1996-12-10 | Pièce d'horlogerie comportant une génératrice d'énergie électrique |
DE1996609618 DE69609618T2 (de) | 1996-12-10 | 1996-12-10 | Zeitmessgerät mit einem Generator zur Erzeugung elektrischer Energie |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19960119747 EP0848306B1 (fr) | 1996-12-10 | 1996-12-10 | Pièce d'horlogerie comportant une génératrice d'énergie électrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0848306A1 EP0848306A1 (fr) | 1998-06-17 |
EP0848306B1 true EP0848306B1 (fr) | 2000-08-02 |
Family
ID=8223482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960119747 Expired - Lifetime EP0848306B1 (fr) | 1996-12-10 | 1996-12-10 | Pièce d'horlogerie comportant une génératrice d'énergie électrique |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0848306B1 (fr) |
DE (1) | DE69609618T2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60312536T2 (de) * | 2003-12-16 | 2007-11-22 | Asulab S.A. | Elektromechanische Uhr, die mit einer Gangreserveanzeige ausgerüstet ist |
EP1843227A1 (fr) | 2006-04-07 | 2007-10-10 | The Swatch Group Research and Development Ltd. | Résonateur couplé système réglant |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3849717A (en) * | 1970-08-13 | 1974-11-19 | R Ostreicher | Circuit for operation of gas discharge lamps |
DE2402603A1 (de) * | 1974-01-19 | 1975-07-24 | Hubert Kalinowski | Anordnung zum spannungsvervielfacher |
US4799003A (en) * | 1987-05-28 | 1989-01-17 | Tu Xuan M | Mechanical-to-electrical energy converter |
DE3906861A1 (de) * | 1988-03-04 | 1989-09-14 | Fraunhofer Ges Forschung | Energieversorgungseinheit |
JP3174245B2 (ja) * | 1994-08-03 | 2001-06-11 | セイコーインスツルメンツ株式会社 | 電子制御時計 |
-
1996
- 1996-12-10 DE DE1996609618 patent/DE69609618T2/de not_active Expired - Fee Related
- 1996-12-10 EP EP19960119747 patent/EP0848306B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69609618T2 (de) | 2001-04-12 |
DE69609618D1 (de) | 2000-09-07 |
EP0848306A1 (fr) | 1998-06-17 |
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