EP2050149A1 - Transformateur piézoélectrique - Google Patents

Transformateur piézoélectrique

Info

Publication number
EP2050149A1
EP2050149A1 EP07817742A EP07817742A EP2050149A1 EP 2050149 A1 EP2050149 A1 EP 2050149A1 EP 07817742 A EP07817742 A EP 07817742A EP 07817742 A EP07817742 A EP 07817742A EP 2050149 A1 EP2050149 A1 EP 2050149A1
Authority
EP
European Patent Office
Prior art keywords
contact layer
opening
functional part
aperture
transformer according
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.)
Withdrawn
Application number
EP07817742A
Other languages
German (de)
English (en)
Inventor
Heinz Florian
Igor Kartashev
Patrick Schmidt-Winkel
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.)
TDK Electronics AG
Original Assignee
Epcos 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 Epcos AG filed Critical Epcos AG
Publication of EP2050149A1 publication Critical patent/EP2050149A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/872—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices
    • H10N30/874—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices embedded within piezoelectric or electrostrictive material, e.g. via connections
    • 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
    • H10N30/01—Manufacture or treatment
    • H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
    • 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
    • H10N30/40—Piezoelectric or electrostrictive devices with electrical input and electrical output, e.g. functioning as transformers

Definitions

  • An object to be solved is to provide a piezoelectric transformer which can be mounted to save space on a carrier.
  • a piezoelectric transformer having a body comprising two functional parts and an insulating region which mechanically connects the functional parts.
  • a first breakthrough and a second breakthrough is formed in the body. The respective breakthrough penetrates both functional parts and the insulating area.
  • the piezoelectric transformer is referred to below as a piezo transformer.
  • a first functional part is an input part and a second functional part is an output part of the transformer.
  • the openings are each suitable for receiving a carrier element, which is preferably provided as an electrical connection element for contacting the functional parts.
  • the connection element is for example a pin or a tube.
  • One end of the support member projects out of the body and is mountable in a carrier.
  • the aperture is a through opening which extends from a first end face of the body to the second end face.
  • a continuous opening is particularly robust compared to a blind hole depression and is characterized by a lower probability of cracking. This is of particular importance because the body vibrates during operation of the transformer, which can lead to cracking.
  • the specified piezotransformer is highly reliable.
  • the respective functional part comprises alternately arranged first and second internal electrodes, which are aligned perpendicular to the longitudinal direction of the body.
  • the internal electrodes are each arranged between two piezoelectric layers.
  • the piezoelectric layers are referred to below as piezo layers.
  • the terminal inner electrodes of the respective functional part are arranged in a variant between a piezoelectric layer and the insulating region.
  • the openings preferably extend in the longitudinal direction of the body, ie perpendicular to the internal electrodes.
  • mechanical vibrations are excited, which preferably also propagate in the longitudinal direction.
  • the vibrations are characterized by an electromechanical coupling coefficient k 33 .
  • the openings preferably have at least one contact layer which has a group of internal electrodes with one another combines.
  • an elongated connection element preferably a metal pin, a metal tube or a composite of metal fibers, for. B. a wire rope arranged.
  • metal instead of the metal, other conductive materials come into consideration, for. As electrically conductive ceramics, carbon fiber materials, composites.
  • connection element projects out of the body.
  • the connection element can be firmly connected to an external carrier, preferably a printed circuit board.
  • the connecting element is preferably sufficiently stable and suitable as a supporting element for the body.
  • connection element Between the connection element and the body, a resilient device is preferably arranged, which is suitable for damping vibrations of the body.
  • the connection element may alternatively have self-vibration damping properties or a spring device.
  • the respective contact layer is conductively connected in a variant with an externally accessible terminal surface, which is arranged on an end face of the body.
  • a connection wire can be attached to this connection surface.
  • At least a portion of the inner surface of the first aperture is covered by a first contact layer which conductively connects the first inner electrodes of the first functional portion.
  • At least a portion of the inner surface of the second aperture is covered by a second contact layer which conductively connects the second inner electrodes of the first functional portion.
  • At least a portion of the inner surface of the first opening is protected by a third contact layer. covers the first internal electrodes of the second functional part conductively connects. In this case, at least a region of the inner surface of the second opening is covered by a fourth contact layer, which conductively connects the second inner electrodes of the second functional part.
  • a third breakthrough and a fourth breakthrough is formed in the body. At least a portion of the inner surface of the third aperture is covered by a third contact layer which conductively connects the first inner electrodes of the second functional portion. At least a portion of the inner surface of the fourth aperture is covered by a fourth contact layer which conductively connects the second inner electrodes of the second functional portion.
  • the first internal electrodes of the respective functional part have a recess in which the second aperture is arranged.
  • the second internal electrodes of the respective functional part have a recess in which the first opening is arranged.
  • a filling material is preferably arranged.
  • the filler material is preferably electrically insulating.
  • the filling material is preferably arranged at least in a region of the opening which adjoins the insulating region.
  • the filler material preferably has hydrophobic properties.
  • filling material for example silicone is suitable. However, it is also possible to use other materials, in particular electrically insulating materials, with a high dielectric strength.
  • the piezoelectric layers preferably contain a ceramic material such as. B. lead zirconate titanate. Alternatively, other preferably ceramic, in particular lead-free piezoelectric materials are used.
  • the insulating region comprises an electrically insulating material, preferably ceramic, which differs from the material of the piezoelectric layers.
  • the material of the insulating region may also be the same as the material of the piezoelectric layers.
  • the piezotransformer is manufactured, for example, as follows.
  • a body is provided with two partial bodies and an insulating region arranged between them, wherein the partial bodies are respectively provided by stacking ceramic layers and metal layers.
  • the body In the body at least two openings are generated perpendicular to the layer orientation.
  • the body is sintered with the apertures.
  • the breakthroughs can be generated after sintering.
  • the breakthroughs for example, by drilling - z. As mechanical drilling, laser drilling, jet drilling - or punching can be generated.
  • the openings are preferably each metallized after sintering.
  • a metal paste is applied to the inner surface of the openings and then baked.
  • vapor deposition of a conductive layer is possible.
  • FIG. 1B is a plan view of a metallization plane of the piezo transformer according to FIG. 1A;
  • FIG. 2A fragmentary a piezoelectric transformer with four openings
  • FIG. 2B shows a detail of a first longitudinal section of the piezotransformer according to FIG. 2A;
  • FIG. 2C a detail of a second longitudinal section of the piezotransformer according to FIG. 2A.
  • FIG. 1A shows a piezoelectric transformer with a ceramic body 3, which comprises an input part 5, an output part 7 and an insulating region 10 arranged between them.
  • the input part 5 and the output part 7 are mechanically coupled together by means of the insulating region 10. They are electrically insulated from each other by the insulating area.
  • An electrical input signal is converted in the input part of the piezoelectric transformer into mechanical vibrations of the main body of the transformer. Due to the mechanical coupling of the input part and the output part both parts are affected by the mechanical vibration. The conversion of electrical energy into mechanical energy occurs due to the inverse piezoelectric effect. In the output part, the mechanical vibrations are transformed back into an electrical output signal due to the direct piezoelectric effect.
  • the Output voltage may be smaller or larger than the input voltage depending on the transformation ratio of the transformer.
  • the input and output voltage can also be the same size, the transformer is used for example for a galvanic decoupling of two circuits.
  • a first opening 1 and a second opening 2 is formed in the body 3.
  • the openings connect two opposing faces of the body.
  • the input part 5 includes first inner electrodes 4a and second inner electrodes 4b, which are alternately arranged.
  • the first internal electrodes 4a are conductively connected to one another via a first contact layer 6a, which is arranged in the first opening 1.
  • the second internal electrodes 4b are conductively connected to one another via a second contact layer 6b, which is arranged in the second opening 2.
  • the output part 7 includes first inner electrodes 8a and second inner electrodes 8b arranged alternately.
  • the first internal electrodes 8a are conductively connected to one another via a first contact layer 9a, which is arranged in the first opening 1.
  • the second internal electrodes 8b are conductively connected to one another via a second contact layer 9b, which is arranged in the second opening 2.
  • the contact layers 6a, 6b, 9a, 9b are conductor surfaces which each cover a region of the inner wall of the opening 1, 2 arranged in the input part or output part.
  • the internal electrodes of the piezotransformer can be electrically contacted via the contact layers 6a, 6b, 9a, 9b. _ o _
  • an electrically insulating filling material 11 or a passivation layer 12 is provided in this region of the opening.
  • the passivation layer 12 covers a region of the respective contact layer 6a, 6b, 9a, 9b.
  • the dielectric strength of the filler or the passivation layer preferably exceeds that of the piezoelectric layers.
  • the filler or the passivation layer may have organic and / or inorganic components.
  • the internal electrodes 4a, 4b, 8a, 8b are embedded in the body 3.
  • the configuration of an inner electrode is explained in the figure IB for the inner electrode 4a (section AA). It applies correspondingly to the internal electrodes 4b, 8a, 8b.
  • the first inner electrode 4a contacts the first contact layer 6a, but is spaced from the second contact layer 6b.
  • the first inner electrode 8a contacts the first contact layer 9a and is spaced from the second contact layer 9b.
  • the second inner electrode 4b contacts the second contact layer 6b and is spaced from the first contact layer 6a.
  • the second inner electrode 8b contacts the second contact layer 9b and is spaced from the first contact layer 9a.
  • the second opening 2 is arranged in a recess 41 of the first inner electrode 4a and a recess 43 of the first inner electrode 8a.
  • the second contact layer 6b is disposed in the recess 41 of the first inner electrode 4a and, similarly, the second contact layer 9b is disposed in the recess 43 of the first inner electrode 8a.
  • the first opening 1 is arranged in a recess 42 of the second inner electrode 4b and a recess 44 of the second inner electrode 8b.
  • the first contact layer 6a is disposed in the recess 42 of the second inner electrode 4b and, correspondingly, the first contact layer 9a is disposed in the recess 44 of the second inner electrode 8b.
  • the openings 1, 2 lie in the variant according to the figures IA, IB along a line which passes through the center of the body 3 and is parallel to first side surfaces of the body.
  • the openings 1, 2 lie in a further variant along a diagonal. In principle, any, including asymmetric, arrangement of breakthroughs is possible.
  • the transformer parts are shown with the same spacing between the first and second internal electrodes. This distance can also be chosen differently in order to achieve a desired transmission ratio.
  • FIGS. 2A, 2B, 2C show a further piezotransformer.
  • FIG. 2B corresponds to the section AA and
  • FIG. 2C corresponds to the section BB.
  • each contact layer ie for each contact layer a separate breakthrough.
  • the Contact layers 9a, 9b are arranged in the openings 21 and 22.
  • Each inner electrode is conductively connected to the respective contact layer of one of the openings.
  • the other openings are arranged in a respective recess 42, 43, 44 of this inner electrode. Since the openings 21, 22 are not metallized in the input part 5, can be dispensed with the recesses 43, 44.
  • the design of the piezotransformer in particular the shape and the number of transformer elements, is not limited to the variants presented in the figures.
  • the body is preferably in the form of a cuboid.
  • the faces of the body may be rectangular or square.
  • the body can also be cylindrical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un transformateur piézoélectrique pourvu d'un corps (3) qui comprend deux éléments fonctionnels (5, 7) et une région isolante (10) reliant mécaniquement lesdits éléments fonctionnels (5, 7). Un premier (1) et un second passage (2) sont ménagés dans le corps (3). Chaque passage (1, 2) traverse les deux éléments fonctionnels et la région isolante.
EP07817742A 2006-10-24 2007-10-23 Transformateur piézoélectrique Withdrawn EP2050149A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006050064A DE102006050064A1 (de) 2006-10-24 2006-10-24 Piezoelektrischer Transformator
PCT/DE2007/001908 WO2008049416A1 (fr) 2006-10-24 2007-10-23 Transformateur piézoélectrique

Publications (1)

Publication Number Publication Date
EP2050149A1 true EP2050149A1 (fr) 2009-04-22

Family

ID=39113359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07817742A Withdrawn EP2050149A1 (fr) 2006-10-24 2007-10-23 Transformateur piézoélectrique

Country Status (3)

Country Link
EP (1) EP2050149A1 (fr)
DE (1) DE102006050064A1 (fr)
WO (1) WO2008049416A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065989A1 (fr) 2010-11-15 2012-05-24 Epcos Ag Composant piézoélectrique

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2842382B2 (ja) * 1996-06-11 1999-01-06 日本電気株式会社 積層型圧電トランスおよびその製造方法
JP3139452B2 (ja) * 1998-04-10 2001-02-26 日本電気株式会社 圧電トランス及びその製造方法
US6182340B1 (en) * 1998-10-23 2001-02-06 Face International Corp. Method of manufacturing a co-fired flextensional piezoelectric transformer
JP2000294847A (ja) * 1999-04-02 2000-10-20 Matsushita Electric Ind Co Ltd 圧電トランス
JP4567440B2 (ja) * 2002-05-06 2010-10-20 エプコス アクチエンゲゼルシャフト ピエゾアクチュエータおよびピエゾアクチュエータの製造方法
DE102005015600A1 (de) * 2005-04-05 2006-10-12 Epcos Ag Piezoelektrischer Transformator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008049416A1 *

Also Published As

Publication number Publication date
DE102006050064A1 (de) 2008-04-30
WO2008049416A1 (fr) 2008-05-02

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