EP0712059A1 - Treiberschaltung für piezoelektrischen vibrator - Google Patents

Treiberschaltung für piezoelektrischen vibrator Download PDF

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Publication number
EP0712059A1
EP0712059A1 EP95117055A EP95117055A EP0712059A1 EP 0712059 A1 EP0712059 A1 EP 0712059A1 EP 95117055 A EP95117055 A EP 95117055A EP 95117055 A EP95117055 A EP 95117055A EP 0712059 A1 EP0712059 A1 EP 0712059A1
Authority
EP
European Patent Office
Prior art keywords
switching means
vibrator
transistor
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.)
Granted
Application number
EP95117055A
Other languages
English (en)
French (fr)
Other versions
EP0712059B1 (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 for a piezoelectric vibrator.
  • a vibrator is intended in particular to equip an electronic watch with an acoustic alarm device.
  • Control circuits for a piezoelectric vibrator are already known, for example thanks to American patent US-A-4 232 241.
  • This document describes such a circuit which comprises a branch comprising a coil and a diode connected in series, and a piezoelectric vibrator connected in parallel with the branch thus forming a parallel circuit.
  • One side of this parallel circuit is connected to a power source, while the other side of this parallel circuit is connected to a transistor, also connected to the source.
  • a current flows through the branch and the transistor, and the coil stores the corresponding electromagnetic energy.
  • the transistor is put in the blocking state, the current flows in the parallel circuit, and the induced voltage in the coil is then applied to the terminals of the vibrator in order to excite the latter.
  • the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms.
  • the amount of energy that the coil can store is a function of its volume, that is to say of its number of turns and the diameter of the wire which constitutes it.
  • this circuit should not be too large.
  • the aim of the present invention is to provide a solution to these problems by presenting a circuit for control of a piezoelectric vibrator which is simple to build, which does not cost much, and which makes it possible to reach a very high sound level, without the dimensions of this circuit becoming too large, so that it can be incorporated in a watch for example.
  • the solution recommended by the invention consists in supplying a piezoelectric vibrator by two supply channels, each comprising a coil.
  • the vibrator can be kept under tension continuously and it is excited in a maximum way.
  • the vibrator is excited in both directions relative to its rest position and therefore it has a greater displacement than the vibrator of the prior art. It is therefore understood that, even if the efficiency of this circuit is reduced, the sound level will be higher compared to the circuits of the prior art.
  • Figure 1 schematically shows a control circuit of a piezoelectric vibrator according to the invention.
  • the circuit includes a supply voltage source 1, for example a 3-volt source, supplying two electrical branches.
  • Each branch has a series connection of a coil 2, 2 'and a diode 3, 3 ', this connection being connected by means of 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 ', to switching means, for example transistors T1, T2.
  • Each transistor T1, T2 is connected by its transmitter to the low voltage level of the source 1 so that a current can flow in each branch when a transistor is in the conducting state.
  • the position of the series connection and of the transistor can be reversed.
  • the common terminal of the transistors will be the terminal connected to the high voltage level instead of the terminal which is connected to the low voltage level of the source 1 in the example given.
  • a piezoelectric vibrator 4 such as 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.
  • the signal S2 is phase shifted with respect to the signal S1, for example by 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 blocking state by the control signal S2.
  • the control signals S1, S2 are for example pulse signals, each side of which changes the state of the transistors T1 and T2 respectively.
  • the transistor T2 When the transistor T2 is placed in the conducting state, the transistor T1 is put in the blocking state, and an electric current flows through the coil 2 ′ and the diode 3 ′ from the DC voltage source 1 passing through the transistor T2, the coil 2 'thus storing the corresponding energy.
  • the transistor T1 When the transistor T1 goes to the conductive state thanks to its control signal S1, the transistor T2 therefore goes to the blocking state under the action of its control signal S2, out of phase with the signal S1.
  • the voltage induced in the coil 2 ' will then be applied to the terminals of the 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 the coil 2 then stores the corresponding energy.
  • the vibrator 4 is therefore kept under tension continuously by the voltage induced either by the coil 2 or by the coil 2 '. If the frequency of the changes in the voltage applied to the vibrator 4 corresponds to the resonant frequency of the vibrator, the latter will be excited to the maximum.
  • FIG. 2 schematically represents this excitation of the vibrator 4.
  • the voltage applied by the coil 2 excites the vibrator 4 in a first direction relative to its rest position, for example, in the upward direction indicated by the dotted line at the Figure 2.
  • the voltage applied by the coil 2 ' will excite the vibrator 4 then in the other direction, for example downwards as also shown in Figure 2, at the time of the change of state of the transistors T1, T2 as this has was explained above.
  • the vibrator 4 is therefore attacked alternately and vibrates in both directions, in a manner comparable to the diaphragm of a loudspeaker, 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 the control signals S1 and S2 which have slightly different frequencies.
  • control signals S1 and S2 which have slightly different frequencies.
  • the control circuit of the invention can then advantageously be used in a wristwatch with an alarm device.
  • the circuit according to the invention makes it possible to reach, with a clock battery, a sound level of the order of 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed. .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Electronic Switches (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
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
CH3333/94 1994-11-08
CH03333/94A CH687115B5 (fr) 1994-11-08 1994-11-08 Circuit de commande d'un vibreur piezo-electrique.

Publications (2)

Publication Number Publication Date
EP0712059A1 true EP0712059A1 (de) 1996-05-15
EP0712059B1 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 (10)

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)
SG (1) SG45119A1 (de)
TW (1) TW371729B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5883861A (en) * 1997-05-14 1999-03-16 Asulab S.A. Timepiece associated with a compass and a sighting device

Families Citing this family (5)

* 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
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

Citations (4)

* 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
US4232241A (en) 1977-05-26 1980-11-04 Kabushiki Kaisha Seikosha Electric circuit for driving a piezoelectric vibrator
DE3230218A1 (de) * 1982-08-13 1984-02-23 Braun Ag, 6000 Frankfurt Elektronische uhr oder uhrenradio mit einem wecksignal unterschiedlicher lautstaerke
JPH01264575A (ja) * 1988-04-13 1989-10-20 Toyota Motor Corp 圧電素子駆動装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
US4714935A (en) * 1983-05-18 1987-12-22 Canon Kabushiki Kaisha Ink-jet head driving circuit

Patent Citations (4)

* 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
US4232241A (en) 1977-05-26 1980-11-04 Kabushiki Kaisha Seikosha Electric circuit for driving a piezoelectric vibrator
DE3230218A1 (de) * 1982-08-13 1984-02-23 Braun Ag, 6000 Frankfurt Elektronische uhr oder uhrenradio mit einem wecksignal unterschiedlicher lautstaerke
JPH01264575A (ja) * 1988-04-13 1989-10-20 Toyota Motor Corp 圧電素子駆動装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 28 (E - 875) 19 January 1990 (1990-01-19) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5883861A (en) * 1997-05-14 1999-03-16 Asulab S.A. Timepiece associated with a compass and a sighting device

Also Published As

Publication number Publication date
CH687115B5 (fr) 1997-03-27
CN1084001C (zh) 2002-05-01
JPH08233957A (ja) 1996-09-13
DE69503021T2 (de) 1999-02-11
US5635788A (en) 1997-06-03
SG45119A1 (en) 1998-01-16
EP0712059B1 (de) 1998-06-17
HK1012168A1 (en) 1999-07-23
AU3669795A (en) 1996-05-16
TW371729B (en) 1999-10-11
CN1129821A (zh) 1996-08-28
DE69503021D1 (de) 1998-07-23
CH687115GA3 (fr) 1996-09-30
ATE167581T1 (de) 1998-07-15
AU694567B2 (en) 1998-07-23

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