WO2009155891A1 - Circuit and method for controlling a trimorphemic piezoelectric actuator - Google Patents
Circuit and method for controlling a trimorphemic piezoelectric actuator Download PDFInfo
- Publication number
- WO2009155891A1 WO2009155891A1 PCT/DE2009/000363 DE2009000363W WO2009155891A1 WO 2009155891 A1 WO2009155891 A1 WO 2009155891A1 DE 2009000363 W DE2009000363 W DE 2009000363W WO 2009155891 A1 WO2009155891 A1 WO 2009155891A1
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- WO
- WIPO (PCT)
- Prior art keywords
- piezoelectric
- voltage divider
- drive
- piezoelectric layer
- common electrode
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/802—Drive or control circuitry or methods for piezoelectric or electrostrictive devices not otherwise provided for
Definitions
- the present invention relates to a drive circuit or a method for controlling piezo units, in particular a trimorphic piezoelectric actuator, according to the preamble of independent claims 1 and 11.
- Piezo units in particular trimorphic piezoelectric actuators z. B. used as actuators in valves for pneumatic and hydraulic systems. They usually consist of several stacked piezoelectric layers, these piezoelectric layers are each provided with a pair of electrodes and are supplied by these pairs of electrodes with voltage. Piezo actuators with two piezo layers are referred to as bimorph piezo actuators, or piezo actuators with more than two piezo layers as multimorph piezo actuators. Piezo actuators with two active piezo layers and a passive intermediate layer are called trimorphic piezoactuators. All of these different piezo actuators use the reciprocal piezoelectric effect of the piezo layers.
- the control of the piezo actuators is often bipolar.
- the electrode pair of a first piezoelectric layer (or the electrode pairs of a first group of piezoelectric layers) is connected to a first voltage source.
- the electrode pair of a second piezoelectric layer (or the electrode pairs of a second group of piezoelectric layers) is connected to a second voltage source.
- a drive voltage lies between a pair of electrodes in accordance with the direction of polarization of the piezo layer lying therebetween, then it expands. If the applied voltage acts against the polarization of the intervening piezoelectric layer, it contracts.
- the power requirement and thus also the power losses in active operation of the piezoelectric actuator due to the cross-flow through the resistance circuit become correspondingly large. It should also be mentioned that the switching voltages in piezo actuators can often amount to several hundred volts.
- the present invention is therefore based on the object to provide a drive circuit or a method for controlling piezo units, in particular trimorphic piezo actuators, which / has none of the above-mentioned disadvantages.
- This object is achieved by generating the drive voltages for the two piezoelectric layers (or the groups of piezoelectric layers) with a capacitive voltage divider.
- the invention is based on the consideration that adjusts the voltages of the partial capacitances according to the ratios of the capacitive voltage divider.
- the two drive voltages of the piezoelectric layers are generated according to the invention by a capacitive voltage divider.
- a capacitive voltage divider For this purpose, two opposite electrodes of two piezoelectric layers are short-circuited, so that these two electrodes form a common electrode for the two opposite sides of the two piezoelectric layers.
- This common electrode simultaneously corresponds to the center tap of the capacitive voltage divider.
- the drive circuits according to the invention offer in comparison to the known drive circuits of piezo units shorter positioning times while minimizing power loss when controlling the piezo units.
- the capacitive voltage divider preferably consists of a first capacitor arranged between the common electrode and the drive reference potential and the two self-capacitances of the piezoelectric layers with the common electrode.
- the capacitive voltage divider is provided with two further capacitors, wherein a first of these two capacitors parallel to the first piezoelectric layer thus parallel to the self-capacitance of this first piezoelectric layer and a second of these two capacitors parallel to the second piezoelectric layer is arranged to the self-capacitance of this second piezoelectric layer.
- the self-capacitances of the piezoelectric layers can be increased by these two further capacitors. This can have a positive effect on the dimensioning of the drive voltages of the piezoelectric layers.
- a resistance voltage divider can advantageously be connected in parallel with the capacitive voltage divider.
- This resistance voltage divider can be designed correspondingly high impedance and preferably consists of a first resistor and two other resistors.
- the first resistor is arranged in parallel with the first capacitor and thus between the common electrode and the drive reference potential.
- the two further resistors are thus arranged parallel to one of the two piezoelectric layers thus one of the two self-capacitances of the piezoelectric layers.
- the voltages set by the resistance voltage divider should correspond to the capacitive voltage divider.
- a circuit unit for limiting the voltage is arranged parallel to the first capacitor and thus likewise between the common electrode and the drive reference potential.
- this voltage limiting circuit consists of a Zener diode. Due to the arrangement and corresponding dimensioning of the Zener diode, the height of the second drive voltage generated by the first capacitor can be limited to a desired voltage value during the charging process of this capacitor.
- the second drive voltage is held at the drive reference potential, so that the second piezo unit supplied with the second drive voltage does not generate any undesired counterforce.
- combinations of the circuit expansions described above can also be arranged for the capacitive voltage divider.
- FIG. 1 shows a first drive circuit according to the invention
- FIG. 6 shows a second drive circuit according to the invention with an extended capacitive voltage divider
- FIG. 7 shows a third drive circuit according to the invention with a
- FIG. 8 shows a fourth drive circuit according to the invention with a Zener diode as
- the trimorphic piezoelectric actuator consists of two active piezoelectric layers 110, 120 and a passive intermediate layer 200.
- the two piezoelectric layers 110, 120 are each connected to a pair of electrodes 311, 312 and 321, 322 with electrical supply lines 510, 520, 530 thus also electrically connected to connection points 1, 2, 3.
- the electrodes 312, 321 are electrically short-circuited and thus form a common electrode 400 for the two piezoelectric layers 110, 120.
- a capacitor C1 is arranged according to the invention.
- This capacitor C1 forms with the self-capacitances C10, C20 of the piezoelectric layers 110, 120 a capacitive voltage divider.
- the control of the piezoelectric actuator according to Figure 1 is explained in more detail in Figures 2 and 4.
- the activation of the piezoelectric actuator can be done in two directions.
- FIGS. 2, 4 illustrate the two piezoelectric layers 110, 120 are polarized in mutually opposite directions P110, P120, the polarizations P110, P120 being applied perpendicular to the longitudinal direction of the piezoelectric layer 110, 120.
- the piezoelectric layer 110 or 120 expands upon application of a positive voltage (ie, the voltage direction also the direction of the electric field is equal to the polarization of the piezoelectric layer) at the piezoelectric layer 110, 120 or when applying a negative voltage (ie the direction of the electric field is opposite to the polarization of the piezoelectric layer).
- a positive voltage ie, the voltage direction also the direction of the electric field is equal to the polarization of the piezoelectric layer
- a negative voltage ie the direction of the electric field is opposite to the polarization of the piezoelectric layer.
- connection point 1 a drive voltage UB is applied at connection point 1.
- connection points 2 and 3 are held at the ground potential at the same voltage reference potential, for example.
- the capacitor C1 with the self-capacitance C20 of the piezoelectric layer 120 forms a parallel circuit.
- This parallel circuit again forms a series circuit with the self-capacitance C10 of the piezoelectric layer 110 and is fed by the drive voltage UB, as illustrated by the equivalent circuit in FIG.
- the two piezo layers are polarized in mutually opposite directions P110, P120.
- the two voltages U11, U12 are rectified relative to each other or the first piezoelectric layer 110, however, directed counter to the second piezoelectric layer 120.
- the two voltages U11, U12 in the two piezoelectric layers 110, 120 act differently.
- the voltage U11 has a positive change in length 510 or expansion of the piezoelectric layer 110 in the longitudinal direction
- the voltage U12 has a negative change in length 520 or contraction of the piezoelectric layer 120 in the longitudinal direction.
- connection point 3 In the second case, the control voltage UB is applied at connection point 3.
- the connection point 1 is held in this step with the connection point 2 at the ground potential.
- the capacitor C1 forms a parallel circuit in this step with the self-capacitance C10 of the piezoelectric layer 110.
- This parallel circuit in turn forms a series circuit with the self-capacitance C20 of the piezoelectric layer 120 and is fed by the drive voltage UB, as illustrated by the equivalent circuit in FIG.
- the two voltages U11, U12 on the two piezoelectric layers 110, 120 cause a negative change in length 540 in the piezoelectric layer 110 and a positive change in length 550 in the piezoelectric layer 120 in contrast to the first step.
- These length changes 540, 550 in turn lead to a bend the passive intermediate layer 200 together with the two piezo layers 110, 120 in the direction of arrow 560.
- another capacitor C2, C3 is arranged parallel to the self-capacitances C10, C20 of the piezoelectric layers 110, 120, as illustrated in FIG.
- a first capacitor C2 parallel to the first piezoelectric layer 110 is thus also arranged parallel to the self-capacitance C10 of this first piezoelectric layer 110 and another capacitor C3 parallel to the second piezoelectric layer 120 is also arranged parallel to the self-capacitance C20 of this second piezoelectric layer 120.
- the self-capacitances C10, C20 of the piezoelectric layers 110, 120 can be increased by these two further capacitors C2, C3.
- the desired operating point of the piezoelectric actuator is set.
- FIG. 7 shows a further embodiment of the drive circuit 30 according to the invention with a resistance voltage divider for reducing or avoiding the voltage drift with long turn-on times of the drive voltages.
- the resistance voltage divider consists of a first and two further resistors R1, R2, and R3.
- the first resistor R1 is arranged parallel to the first capacitor C1 and thus likewise between the common electrode 400 and the drive reference potential Uo.
- One of the two further resistors R2 is thus arranged in parallel to the first piezoelectric layer 110 and thus between the connection point 1 and the common electrode 400 or the second of these two resistors R3 parallel to the second piezoelectric layer 120 between the connection point 2 and the common electrode 400.
- FIG. 8 shows a further embodiment of the drive circuit 40 according to the invention with a circuit unit for limiting the voltage, wherein this circuit unit is preferably a Zener diode Z arranged parallel to the capacitor C1 and thus also between the common electrode 400 and the drive reference potential Uo.
- this circuit unit is preferably a Zener diode Z arranged parallel to the capacitor C1 and thus also between the common electrode 400 and the drive reference potential Uo.
- the Zener diode Z By appropriate dimensioning of the Zener diode Z, the maximum height of the second drive voltage U400 generated by the capacitor C1 can thus be limited to the common electrode 400 during the charging process to a desired voltage value.
- the second drive voltage U400 is limited to the drive reference potential (more precisely the flow voltage of the Zener diode), so that the second piezo unit supplied with the second drive voltage does not generate any undesired counterforce.
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112009002070T DE112009002070A5 (en) | 2008-06-25 | 2009-03-14 | Circuit and method for controlling a trimorphic piezoelectric actuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008030248.1 | 2008-06-25 | ||
DE102008030248A DE102008030248A1 (en) | 2008-06-25 | 2008-06-25 | Control circuit and method for controlling piezo unit, in particular trimorphic piezoelectric actuator |
Publications (1)
Publication Number | Publication Date |
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WO2009155891A1 true WO2009155891A1 (en) | 2009-12-30 |
Family
ID=41059484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/DE2009/000363 WO2009155891A1 (en) | 2008-06-25 | 2009-03-14 | Circuit and method for controlling a trimorphemic piezoelectric actuator |
Country Status (2)
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DE (2) | DE102008030248A1 (en) |
WO (1) | WO2009155891A1 (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150261372A1 (en) * | 2012-03-14 | 2015-09-17 | Bebop Sensors, Inc. | Multi-touch pad controller |
EP3051599A1 (en) * | 2015-02-02 | 2016-08-03 | Seiko Epson Corporation | Piezoelectric element drive circuit and robot |
US9546921B2 (en) | 2009-10-16 | 2017-01-17 | Bebop Sensors, Inc. | Piezoresistive sensors and sensor arrays |
US9652101B2 (en) | 2014-05-15 | 2017-05-16 | Bebop Sensors, Inc. | Two-dimensional sensor arrays |
US9696833B2 (en) | 2014-05-15 | 2017-07-04 | Bebop Sensors, Inc. | Promoting sensor isolation and performance in flexible sensor arrays |
US9710060B2 (en) | 2014-06-09 | 2017-07-18 | BeBop Senors, Inc. | Sensor system integrated with a glove |
US9721553B2 (en) | 2015-10-14 | 2017-08-01 | Bebop Sensors, Inc. | Sensor-based percussion device |
US9753568B2 (en) | 2014-05-15 | 2017-09-05 | Bebop Sensors, Inc. | Flexible sensors and applications |
US9827996B2 (en) | 2015-06-25 | 2017-11-28 | Bebop Sensors, Inc. | Sensor systems integrated with steering wheels |
US9863823B2 (en) | 2015-02-27 | 2018-01-09 | Bebop Sensors, Inc. | Sensor systems integrated with footwear |
US9965076B2 (en) | 2014-05-15 | 2018-05-08 | Bebop Sensors, Inc. | Piezoresistive sensors and applications |
US10082381B2 (en) | 2015-04-30 | 2018-09-25 | Bebop Sensors, Inc. | Sensor systems integrated with vehicle tires |
US10362989B2 (en) | 2014-06-09 | 2019-07-30 | Bebop Sensors, Inc. | Sensor system integrated with a glove |
US10884496B2 (en) | 2018-07-05 | 2021-01-05 | Bebop Sensors, Inc. | One-size-fits-all data glove |
US11480481B2 (en) | 2019-03-13 | 2022-10-25 | Bebop Sensors, Inc. | Alignment mechanisms sensor systems employing piezoresistive materials |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010042119A1 (en) * | 2010-10-07 | 2012-04-12 | Robert Bosch Gmbh | Drive device, microsystem device and method for driving a micromechanical actuator |
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US4169276A (en) * | 1977-10-17 | 1979-09-25 | Ampex Corporation | Drive circuit for controlling a movable magnetic head |
JPS5492307A (en) * | 1977-12-29 | 1979-07-21 | Sony Corp | Driving circuit of electrostrictive converter |
US4562373A (en) * | 1983-10-21 | 1985-12-31 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric motor |
DE4316396C1 (en) * | 1993-05-17 | 1994-09-15 | Mayer Textilmaschf | Warp-knitting machine with at least one guide bar |
-
2008
- 2008-06-25 DE DE102008030248A patent/DE102008030248A1/en not_active Withdrawn
-
2009
- 2009-03-14 WO PCT/DE2009/000363 patent/WO2009155891A1/en active Application Filing
- 2009-03-14 DE DE112009002070T patent/DE112009002070A5/en not_active Ceased
Patent Citations (2)
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US4594526A (en) * | 1982-11-19 | 1986-06-10 | Nec Corporation | Bimorph electromechanical transducer and control circuit device therefor |
EP0124250A1 (en) * | 1983-03-31 | 1984-11-07 | Kabushiki Kaisha Toshiba | Displacement generation device |
Cited By (27)
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US10753814B2 (en) | 2009-10-16 | 2020-08-25 | Bebop Sensors, Inc. | Piezoresistive sensors and sensor arrays |
US10288507B2 (en) | 2009-10-16 | 2019-05-14 | Bebop Sensors, Inc. | Piezoresistive sensors and sensor arrays |
US9546921B2 (en) | 2009-10-16 | 2017-01-17 | Bebop Sensors, Inc. | Piezoresistive sensors and sensor arrays |
US9836151B2 (en) | 2012-03-14 | 2017-12-05 | Bebop Sensors, Inc. | Multi-touch pad controller |
US11204664B2 (en) | 2012-03-14 | 2021-12-21 | Bebop Sensors, Inc | Piezoresistive sensors and applications |
US10802641B2 (en) | 2012-03-14 | 2020-10-13 | Bebop Sensors, Inc. | Piezoresistive sensors and applications |
US20150261372A1 (en) * | 2012-03-14 | 2015-09-17 | Bebop Sensors, Inc. | Multi-touch pad controller |
US10114493B2 (en) * | 2012-03-14 | 2018-10-30 | Bebop Sensors, Inc. | Multi-touch pad controller |
US9696833B2 (en) | 2014-05-15 | 2017-07-04 | Bebop Sensors, Inc. | Promoting sensor isolation and performance in flexible sensor arrays |
US9652101B2 (en) | 2014-05-15 | 2017-05-16 | Bebop Sensors, Inc. | Two-dimensional sensor arrays |
US9753568B2 (en) | 2014-05-15 | 2017-09-05 | Bebop Sensors, Inc. | Flexible sensors and applications |
US10268315B2 (en) | 2014-05-15 | 2019-04-23 | Bebop Sensors, Inc. | Two-dimensional sensor arrays |
US10282011B2 (en) | 2014-05-15 | 2019-05-07 | Bebop Sensors, Inc. | Flexible sensors and applications |
US9965076B2 (en) | 2014-05-15 | 2018-05-08 | Bebop Sensors, Inc. | Piezoresistive sensors and applications |
US9710060B2 (en) | 2014-06-09 | 2017-07-18 | BeBop Senors, Inc. | Sensor system integrated with a glove |
US11147510B2 (en) | 2014-06-09 | 2021-10-19 | Bebop Sensors, Inc. | Flexible sensors and sensor systems |
US10362989B2 (en) | 2014-06-09 | 2019-07-30 | Bebop Sensors, Inc. | Sensor system integrated with a glove |
US10181806B2 (en) | 2015-02-02 | 2019-01-15 | Seiko Epson Corporation | Piezoelectric element drive circuit and robot |
EP3051599A1 (en) * | 2015-02-02 | 2016-08-03 | Seiko Epson Corporation | Piezoelectric element drive circuit and robot |
US9863823B2 (en) | 2015-02-27 | 2018-01-09 | Bebop Sensors, Inc. | Sensor systems integrated with footwear |
US10352787B2 (en) | 2015-02-27 | 2019-07-16 | Bebop Sensors, Inc. | Sensor systems integrated with footwear |
US10082381B2 (en) | 2015-04-30 | 2018-09-25 | Bebop Sensors, Inc. | Sensor systems integrated with vehicle tires |
US10654486B2 (en) | 2015-06-25 | 2020-05-19 | Bebop Sensors, Inc. | Sensor systems integrated with steering wheels |
US9827996B2 (en) | 2015-06-25 | 2017-11-28 | Bebop Sensors, Inc. | Sensor systems integrated with steering wheels |
US9721553B2 (en) | 2015-10-14 | 2017-08-01 | Bebop Sensors, Inc. | Sensor-based percussion device |
US10884496B2 (en) | 2018-07-05 | 2021-01-05 | Bebop Sensors, Inc. | One-size-fits-all data glove |
US11480481B2 (en) | 2019-03-13 | 2022-10-25 | Bebop Sensors, Inc. | Alignment mechanisms sensor systems employing piezoresistive materials |
Also Published As
Publication number | Publication date |
---|---|
DE112009002070A5 (en) | 2011-06-01 |
DE102008030248A1 (en) | 2009-12-31 |
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