EP0712059B1 - Treiberschaltung für piezoelektrischen Vibrator - Google Patents

Treiberschaltung für piezoelektrischen Vibrator Download PDF

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Publication number
EP0712059B1
EP0712059B1 EP95117055A EP95117055A EP0712059B1 EP 0712059 B1 EP0712059 B1 EP 0712059B1 EP 95117055 A EP95117055 A EP 95117055A EP 95117055 A EP95117055 A EP 95117055A EP 0712059 B1 EP0712059 B1 EP 0712059B1
Authority
EP
European Patent Office
Prior art keywords
vibrator
transistor
switching means
circuit
series connection
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
EP95117055A
Other languages
English (en)
French (fr)
Other versions
EP0712059A1 (de
Inventor
Soltermann Bertrand
Jabbour Saji
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.)
Swatch Group Management Services AG
Original Assignee
SMH Management Services 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 SMH Management Services AG filed Critical SMH Management Services AG
Publication of EP0712059A1 publication Critical patent/EP0712059A1/de
Application granted granted Critical
Publication of EP0712059B1 publication Critical patent/EP0712059B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G13/00—Producing acoustic time signals
    • G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
    • G04G13/021—Details

Definitions

  • the present invention relates to a control circuit a piezoelectric vibrator.
  • a vibrator is intended in particular to equip an electronic watch with a device acoustic alarm.
  • the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms. Indeed, the amount of energy that the coil can store is depending on its volume, i.e. its number of turns and the diameter of the wire which constitutes it. As we wish to incorporate the control circuit in a watch for example, we understand that this circuit should not be too big.
  • the object of the present invention is to provide a solution to these problems by presenting a circuit of control of a piezoelectric vibrator which is simple to construction, which is not expensive, and which allows reach a very high noise level, without the dimensions of this circuit become too large, for that it can be incorporated into a watch for example.
  • the solution recommended by the invention consists in supply a piezoelectric vibrator by two ways power supply, each including a coil. So the vibrator can be kept on continuously and he is most excited. Indeed, the vibrator is excited in both directions from its position of rest and so it has a larger displacement than the vibrator of the prior art. We therefore understand that, even if the efficiency of this circuit is reduced, the noise level will be higher compared to art circuits prior.
  • Figure 1 schematically shows a circuit of control of a piezoelectric vibrator according to the invention.
  • the circuit includes a voltage source power supply 1, for example a 3 volt source, supplying two electrical branches.
  • Each branch includes a series connection of a coil 2, 2 'and a diode 3, 3 ', this connection being connected by means a first terminal A, A 'at the high voltage level of the source 1.
  • A first terminal
  • A 'at the high voltage level of the source 1.
  • Each connection is also connected, via a second terminal B, B ', at switching means, for example transistors T1, T2.
  • Each transistor T1, T2 is connected by its emitter to the low voltage level from source 1 so that a current can flow through each branch when a transistor is in the conducting state.
  • the position of the serial connection and the transistor can be reversed.
  • the common terminal of transistors will be the terminal connected to the high voltage level instead of the terminal which is connected to the voltage level bottom of source 1 in the example given.
  • a piezoelectric vibrator 4 such that a piezoelectric membrane is connected between the two terminals B, B '.
  • Each transistor T1, T2 is controlled respectively by a periodic control signal S1 and S2 applied to its base.
  • Signal S2 is out of phase with the signal S1, for example 180 °, so that when the transistor T1 is put in conductive state by the control signal S1, the other transistor T2 is maintained in a state of blocking by control signal S2.
  • the control signals S1, S2 are for example pulse signals, each side of which changes the state of transistors T1 and T2 respectively.
  • transistor T2 When the transistor T2 is put in conductive state, transistor T1 is put in blocking state, and an electric current flows to through coil 2 'and diode 3' from the source of direct voltage 1 passing through transistor T2, the coil 2 'thus storing the corresponding energy.
  • the transistor T1 goes to the state driver thanks to its control signal S1
  • the transistor T2 therefore goes into the blocking state under the action its S2 control signal, out of phase with the signal S1.
  • the voltage induced in the coil 2 ' will then applied to the terminals of vibrator 4 to excite it.
  • a current flows through the coil 2 and the diode 3 from the DC voltage source 1 by the transistor T1, and coil 2 then stores energy corresponding.
  • Vibrator 4 is therefore kept energized continuously by the voltage induced either by the coil 2, or by the coil 2 '. If the frequency of changes of the voltage applied to vibrator 4 corresponds to the resonant frequency of the vibrator, it will be excited in a maximum way.
  • FIG. 2 schematically represents this excitation of the vibrator 4.
  • the voltage applied by the coil 2 energizes vibrator 4 in a first direction by relative to its rest position, for example, in the sense upwards indicated by the dotted line in the figure 2.
  • the voltage applied by the coil 2 ' will excite the vibrator 4 then in the other direction, for example down as also shown in Figure 2, at the time of change of state of transistors T1, T2 as was explained above.
  • the vibrator 4 is therefore attacked in alternating and vibrating in both directions, so comparable to the diaphragm of a speaker, and its displacement d is greater than if it were only excited in one direction.
  • control circuit according to the invention makes it possible to obtain a two-tone alarm, similar to a police alarm, by the use of control signals S1 and S2 which have frequencies slightly different.
  • control signals S1 and S2 which have frequencies slightly different.
  • the control circuit of the invention can then advantageously be used in a wristwatch with alarm device.
  • the circuit according to the invention allows achieve, with a watch battery, a noise level of around 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electromechanical Clocks (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Electric Clocks (AREA)
  • Electronic Switches (AREA)

Claims (4)

  1. Steuerschaltung eines piezoelektrischen Vibrators, umfassend
    einen ersten Zweig mit
    ersten Umschaltmitteln (T1), die bei Empfang eines ersten periodischen Steuersignals (S1) in blockierten Zustand und in leitenden Zustand bringbar sind, und
    einer ersten Serienschaltung einer Spule (2) und einer Diode (3), wobei ein erster Anschluß (A) der ersten Serienschaltung mit einer Speisespannungsquelle (1) verbunden ist und ein zweiter Anschluß (B) der ersten Serienschaltung mit den ersten Umschaltmitteln (T1) verbunden ist, dadurch gekennzeichnet, daß sie ferner umfaßt:
    einen zweiten Zweig mit
    zweiten Umschaltmitteln (T2), die bei Empfang eines zweiten periodischen Steuersignals (S2) in blockierten Zustand und in leitenden Zustand bringbar sind, und
    einer zweiten Serienschaltung einer Spule (2') und einer Diode (3'), wobei ein erster Anschluß (A') der zweiten Serienschaltung mit der Speisespannungsquelle (1) verbunden ist und ein zweiter Anschluß (B') der zweiten Serienschaltung mit den zweiten Umschaltmitteln (T2) verbunden ist,
    welcher Vibrator (4) zwischen die zweiten Anschlüsse (B, B') derart geschaltet ist, daß dann, wenn die ersten Umschaltmittel (T1) im blockierten Zustand sind, die zweiten Umschaltmittel (T2) im leitenden Zustand sind und elektrisch in Serie mit dem Vibrator (4) und der ersten Serienschaltung (2, 3) sind, während dann, wenn die zweiten Umschaltmittel (T2) im blockierten Zustand sind, die ersten Umschaltmittel (T1) in leitendem Zustand sind und elektrisch in Serie mit dem Vibrator (4) und der zweiten Serienschaltung (2', 3') sind.
  2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß die Umschaltmittel jeweils einen Transistor umfassen, an dessen Basis eines der ersten bzw. zweiten Steuersignale (S1, S2) angelegt ist und dessen Kollektor-Emitter-Strecke mit den zweiten Anschlüssen (B, B') verbunden ist.
  3. Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das zweite Steuersignal (S2) gegenüber dem ersten Steuersignal (S1) 180° phasenverschoben ist.
  4. Uhr mit akustischer Alarmeinrichtung, dadurch gekennzeichnet, daß sie eine Steuerschaltung nach Anspruch 1, 2 oder 3 umfaßt.
EP95117055A 1994-11-08 1995-10-30 Treiberschaltung für piezoelektrischen Vibrator Expired - Lifetime EP0712059B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH03333/94A CH687115B5 (fr) 1994-11-08 1994-11-08 Circuit de commande d'un vibreur piezo-electrique.
CH3333/94 1994-11-08

Publications (2)

Publication Number Publication Date
EP0712059A1 EP0712059A1 (de) 1996-05-15
EP0712059B1 true EP0712059B1 (de) 1998-06-17

Family

ID=4253710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117055A Expired - Lifetime EP0712059B1 (de) 1994-11-08 1995-10-30 Treiberschaltung für piezoelektrischen Vibrator

Country Status (11)

Country Link
US (1) US5635788A (de)
EP (1) EP0712059B1 (de)
JP (1) JPH08233957A (de)
CN (1) CN1084001C (de)
AT (1) ATE167581T1 (de)
AU (1) AU694567B2 (de)
CH (1) CH687115B5 (de)
DE (1) DE69503021T2 (de)
HK (1) HK1012168A1 (de)
SG (1) SG45119A1 (de)
TW (1) TW371729B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19644521A1 (de) * 1996-10-25 1998-04-30 Siemens Ag Verfahren und Vorrichtung zum Ansteuern eines kapazitiven Stellgliedes
CH691089A5 (fr) * 1997-05-14 2001-04-12 Asulab Sa Pièce d'horlogerie associée à une boussole et à un viseur.
DE19825210C2 (de) * 1998-04-23 2003-09-25 Gsg Elektronik Gmbh Schaltungsanordnung zur dynamischen Ansteuerung von keramischen Festkörperaktoren
JP5865029B2 (ja) * 2011-11-18 2016-02-17 矢崎エナジーシステム株式会社 警報器
CN102836811A (zh) * 2012-07-30 2012-12-26 西安思坦仪器股份有限公司 压电陶瓷换能器的激发方法及激发电路
JP6308788B2 (ja) * 2013-03-27 2018-04-11 セイコーインスツル株式会社 電子機器及び衝撃検出方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2279254A1 (fr) * 1974-07-16 1976-02-13 Gaboriaud Paul Atomiseur ultrasonique a pilotage automatique
JPS5744398Y2 (de) 1977-05-26 1982-09-30
NL7805802A (nl) * 1978-05-29 1979-12-03 Philips Nv Inrichting voor het besturen van een pieezo-elektrisch positioneringselement.
NL7805804A (nl) * 1978-05-29 1979-12-03 Philips Nv Inrichting voor het aanleggen van een stuurspanning over een pieezo-elektrisch positioneringselement.
DE3230218A1 (de) * 1982-08-13 1984-02-23 Braun Ag, 6000 Frankfurt Elektronische uhr oder uhrenradio mit einem wecksignal unterschiedlicher lautstaerke
US4714935A (en) * 1983-05-18 1987-12-22 Canon Kabushiki Kaisha Ink-jet head driving circuit
JPH01264575A (ja) * 1988-04-13 1989-10-20 Toyota Motor Corp 圧電素子駆動装置

Also Published As

Publication number Publication date
ATE167581T1 (de) 1998-07-15
SG45119A1 (en) 1998-01-16
CH687115GA3 (fr) 1996-09-30
DE69503021T2 (de) 1999-02-11
DE69503021D1 (de) 1998-07-23
EP0712059A1 (de) 1996-05-15
CN1084001C (zh) 2002-05-01
US5635788A (en) 1997-06-03
AU694567B2 (en) 1998-07-23
HK1012168A1 (en) 1999-07-23
JPH08233957A (ja) 1996-09-13
CN1129821A (zh) 1996-08-28
TW371729B (en) 1999-10-11
AU3669795A (en) 1996-05-16
CH687115B5 (fr) 1997-03-27

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