EP2047486A1 - Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeit - Google Patents
Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeitInfo
- Publication number
- EP2047486A1 EP2047486A1 EP07785661A EP07785661A EP2047486A1 EP 2047486 A1 EP2047486 A1 EP 2047486A1 EP 07785661 A EP07785661 A EP 07785661A EP 07785661 A EP07785661 A EP 07785661A EP 2047486 A1 EP2047486 A1 EP 2047486A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ceramic body
- recesses
- element according
- resistance element
- thermal conductivity
- 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
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims description 12
- 239000000945 filler Substances 0.000 description 3
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/08—Cooling, heating or ventilating arrangements
- H01C1/084—Cooling, heating or ventilating arrangements using self-cooling, e.g. fins, heat sinks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
Definitions
- Resistive element with PTC properties and high electrical and thermal conductivity
- An object to be solved is to provide a resistance element which is characterized by a high electrical and thermal conductivity.
- a ceramic ceramic body resistance element having PTC characteristics is disclosed.
- the abbreviation PTC stands for Positive Temperature Coefficient.
- At least one main surface of the Keramikk ⁇ rpers has an array of wells.
- the first main surface of the ceramic body preferably has an arrangement of first depressions and the second main surface of the ceramic body has an arrangement of second depressions.
- the main surfaces of the ceramic body including the surface of the recesses, are preferably covered with an electrode layer.
- Each electrode layer forms an electrode surface.
- the resistance of the resistive element is the lower the larger the electrode area and the smaller the distance between the electrode layers. These parameters are directly related to the geometric parameters such. Depth, width of the recesses and distance between the deepening together. By setting the electrode area explained below and the distance between the electrode layers, it is possible to achieve a given resistance value for the given size of the resistance element.
- the depressions make it possible, in particular, to increase an effective electrode area of the ceramic body and thus to lower the resistance value of the resistance element compared to the embodiment without depressions.
- the recesses also make it possible to reduce the distance between two opposite electrode surfaces of the resistance element. By enlarging the electrode surface, it is also possible to achieve a particularly small resistance element with a high heat output. Low resistance and high heat dissipation are also achieved by small distances of the recesses.
- the first (and second) recesses are preferably in the form of columns or grooves that are parallel to each other.
- the depressions may also be formed as blind holes. A regular arrangement of identically formed depressions is preferred.
- the second recesses may be parallel to the first recesses.
- the second depressions may also extend transversely, in particular perpendicularly or obliquely to the first depressions.
- the recesses may have any cross section.
- the side walls of the depressions can be perpendicular or oblique to the main surfaces of the resistance element. raents run or curved.
- the depressions may also have steps.
- the depth of the recesses preferably exceeds their width.
- the depth of the depressions may be, for example, at least twice their width.
- the depth of the recesses is preferably at least 20% of the thickness of the ceramic body.
- the depth of the recesses may also exceed 50% of the thickness of the ceramic body.
- the first and second recesses may have the same depth. But they can in principle also have different thicknesses from each other.
- the second recesses are arranged offset in an advantageous variant with respect to the first recesses (in a plan view).
- the ceramic body has a serpentine cross section.
- the staggered first and second recesses may overlap with respect to the thickness direction of the ceramic body (in a side view) so as to interlock with each other in a central area of the ceramic body.
- the first and second recesses are alternately arranged in the central region of the Keramikk ⁇ rpers. In this case, the depth of the recesses exceeds half the thickness of the ceramic body.
- the second recesses may lie in a further variant (in a plan view) with respect to the first recesses.
- the depth of the first and the second Recesses smaller than half the thickness of the ceramic body.
- the recesses may be at least partially filled with a filling material whose thermal conductivity exceeds that of the material of the ceramic body.
- the filler material can be electrically insulating.
- the filler material may also be electrically conductive.
- the ceramic body is preferably a solid, rigid sintered body.
- BaTiO 3 is suitable as base material for the ceramic body.
- the ceramic body is preferably provided as a plate.
- the recesses may be formed as cuts in a sintered ceramic body.
- the main surfaces of the ceramic body are metallized after the formation of the depressions to form electrode layers.
- the electrode layers can each z. B. be applied in a galvanic process. They can also be applied by sputtering, steaming or as a metal paste and baked. It is also possible to combine these electrode technologies to generate special layer sequences.
- Such prefabricated resistance elements are preferably provided with electrical connections for the introduction of current.
- the mechanical design can correspond to those of radially contacted or SMD capable components.
- the assembly of these elements may also include a coating of insulating materials, encapsulation in plastics. In this case, a plurality of resistance elements can be encapsulated together.
- These resistive elements can also be connected to at least one flat covering layer whose thermal conductivity preferably exceeds that of the material of the ceramic body.
- This cover layer can be electrically conductive and be suitable as a contact for the current introduction.
- the cover layer may also be formed as a composite comprising an electrically conductive sub-layer and an electrically insulating sub-layer.
- the resistive elements can also be arranged without prefabricated connection to cover layers in such a way that the electrical and thermal contacting with the latter can also take place subsequently.
- Several mechanically interconnected resistive elements can be used together in an array. These resistive elements are preferably electrically connected together.
- FIG. 1 shows a resistance element with an arrangement of depressions on the two main surfaces of the ceramic body
- FIG. 2 shows the resistance element according to FIG. 1 with depressions filled in by a filler
- FIG. 3 shows the resistance element according to FIG. 2, which is arranged between two cover layers;
- FIG. 4 shows the resistance element according to FIG. 2 in SMD design
- Figure 5 different examples for the design of wells.
- FIG. 1 shows a resistance element with a ceramic body 1.
- the ceramic body 1 has first recesses 21, which are arranged on its first main surface (upper side), and second recesses 22, which are arranged on its second main surface (underside). These depressions are preferably, as in the variant according to FIG. 2, filled with a filling material 3 which has a better thermal conductivity than the ceramic body 1.
- a first electrode layer 61 and on the underside of a second electrode layer 62 is arranged on the upper side of the ceramic body.
- the electrode layers 61, 62 also cover the surface of the recesses 21, 22.
- the second recesses 22 are offset laterally relative to the first recesses 21.
- the first and second recesses 21, 22 are not connected to each other.
- the depth of the recesses 21, 22 shown in Figures 1 to 3 is approximately half the thickness of the ceramic body 1.
- Such a deep configuration of the recesses 21, 22 is particularly possible if a) the distance between two consecutive first recesses is greater as the width of the second wells, and b) the distance between two successive second recesses is greater than the width of the first recesses. Further variants of the depressions 21, 22 with regard to their depth and their shape are explained in FIGS. 5A to 5F.
- the ceramic body 1 is arranged in the variant according to FIG. 3 between two covering layers 41, 42.
- the ceramic body 1 is preferably firmly connected to the cover layers 41, 42, for example glued.
- the resistance element shown in Fig. 1 to 3 is suitable for example as a heating element.
- FIG. 4 shows the resistance element according to FIG. 2, which has electrical connections 51, 52 led out to the underside of the resistance element.
- a resistive element is a surface mountable device or SMD device.
- SMD stands for Surface Mounted Device.
- the resistance element shown in FIG. 4 can be mounted on a printed circuit board and is particularly suitable for current protection applications.
- the resistive element may alternatively be used as a wired component, i. H. with wire connections, be formed.
- the depth of the recesses 21, 22 shown in FIG. 5A exceeds half the thickness of the ceramic body 1, so that the first recesses partially overlap and overlap in a central region 10 of the ceramic body.
- the ceramic body 1 has a serpentine cross-section.
- Particularly deep recesses 21, 22 have the advantage that thereby a particularly small distance between the electrode layers 61, 62 adjusted and thus the resistance of the resistive element can be reduced.
- the depth of the recesses 21, 22 shown in FIGS. 5B and 5C is set smaller than half the thickness of the ceramic body 1.
- the second recesses 22 are directly opposite the first recesses 21.
- the remaining thickness of the ceramic body between the recesses 21 , 22 is chosen so that it is sufficient for the stability of the resistive element.
- FIG. 5D shows a resistance element which has an arrangement of depressions 21 on only one side.
- the depressions 21, 22 of the resistance elements shown in FIGS. 1 to 5C have a rectangular cross-section.
- the cross-section of the recesses 21, 22 may alternatively be rounded as in FIG. 5D, as in FIG. 5E with oblique side walls or as in FIG. 5F V-shaped.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Non-Adjustable Resistors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006033691A DE102006033691A1 (de) | 2006-07-20 | 2006-07-20 | Widerstandselement mit PTC-Eigenschaften und hoher elektrischer und thermischer Leitfähigkeit |
| PCT/DE2007/001293 WO2008009280A1 (de) | 2006-07-20 | 2007-07-19 | Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2047486A1 true EP2047486A1 (de) | 2009-04-15 |
| EP2047486B1 EP2047486B1 (de) | 2011-03-09 |
Family
ID=38649999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07785661A Expired - Fee Related EP2047486B1 (de) | 2006-07-20 | 2007-07-19 | Widerstandselement mit ptc-eigenschaften und hoher elektrischer und thermischer leitfähigkeit |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7902958B2 (de) |
| EP (1) | EP2047486B1 (de) |
| JP (1) | JP2009544160A (de) |
| DE (2) | DE102006033691A1 (de) |
| WO (1) | WO2008009280A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6590004B2 (ja) * | 2018-01-15 | 2019-10-16 | 三菱マテリアル株式会社 | サーミスタ素子及びその製造方法 |
| DE102020202195A1 (de) | 2020-02-20 | 2021-08-26 | Eberspächer catem Hermsdorf GmbH & Co. KG | Elektrische Heizeinrichtung |
| CN112802649A (zh) * | 2020-12-28 | 2021-05-14 | 广西新未来信息产业股份有限公司 | 一种增大陶瓷体-银电极接触面积的压敏瓷片 |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5258139A (en) * | 1975-11-08 | 1977-05-13 | Murata Manufacturing Co | Method of producing heater using positive characteristic thermistor |
| US4179797A (en) * | 1978-03-23 | 1979-12-25 | Xerox Corporation | Method of making a resistor array |
| DE3107290A1 (de) | 1980-03-03 | 1982-01-07 | Canon K.K., Tokyo | Heizvorrichtung |
| US4314230A (en) * | 1980-07-31 | 1982-02-02 | Raychem Corporation | Devices comprising conductive polymers |
| DE8309023U1 (de) | 1983-03-25 | 1986-02-20 | Siemens AG, 1000 Berlin und 8000 München | Flexibles Heizelement in Bandform, das aus elektrisch leitfähigen Körnchen aus PTC-Material und einem organischen isolierenden Kunststoff als Bindemittel |
| US4529958A (en) * | 1983-05-02 | 1985-07-16 | Dale Electronics, Inc. | Electrical resistor |
| DE3445698A1 (de) * | 1984-12-14 | 1986-06-26 | C. Conradty Nürnberg GmbH & Co KG, 8505 Röthenbach | Chip-varistor und verfahren zu seiner herstellung |
| JPH03114171A (ja) * | 1989-09-28 | 1991-05-15 | Tdk Corp | 正特性サーミスタ装置 |
| US5153554A (en) * | 1990-05-08 | 1992-10-06 | Raychem Corp. | Low voltage varistor array |
| US5081439A (en) * | 1990-11-16 | 1992-01-14 | International Business Machines Corporation | Thin film resistor and method for producing same |
| US5397518A (en) * | 1993-04-16 | 1995-03-14 | Texas Instruments Incorporated | Process for forming ceramic pixel array and pixel array formed thereby |
| DE4441280C2 (de) * | 1994-11-19 | 1998-08-27 | Asea Brown Boveri | Kaltleiter und Vorrichtung zur Strombegrenzung mit mindestens einem Kaltleiter |
| DE4441279C1 (de) | 1994-11-19 | 1995-09-21 | Abb Management Ag | Vorrichtung zur Strombegrenzung |
| JPH09129408A (ja) * | 1995-10-26 | 1997-05-16 | Matsushita Electric Ind Co Ltd | 正特性サーミスタおよび正特性サーミスタ装置 |
| JP3175102B2 (ja) * | 1996-05-20 | 2001-06-11 | 株式会社村田製作所 | 正特性サーミスタ素体および正特性サーミスタ |
| US6100787A (en) * | 1997-05-28 | 2000-08-08 | Motorola, Inc. | Multilayer ceramic package with low-variance embedded resistors |
| US5953811A (en) * | 1998-01-20 | 1999-09-21 | Emc Technology Llc | Trimming temperature variable resistor |
| JP3624395B2 (ja) | 1999-02-15 | 2005-03-02 | 株式会社村田製作所 | チップ型サーミスタの製造方法 |
| US6323751B1 (en) * | 1999-11-19 | 2001-11-27 | General Electric Company | Current limiter device with an electrically conductive composite material and method of manufacturing |
| KR20060069350A (ko) | 2003-09-17 | 2006-06-21 | 로무 가부시키가이샤 | 칩 저항기와 그 제조방법 |
-
2006
- 2006-07-20 DE DE102006033691A patent/DE102006033691A1/de not_active Ceased
-
2007
- 2007-07-19 WO PCT/DE2007/001293 patent/WO2008009280A1/de not_active Ceased
- 2007-07-19 JP JP2009519790A patent/JP2009544160A/ja active Pending
- 2007-07-19 EP EP07785661A patent/EP2047486B1/de not_active Expired - Fee Related
- 2007-07-19 DE DE502007006682T patent/DE502007006682D1/de active Active
-
2009
- 2009-01-20 US US12/356,270 patent/US7902958B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008009280A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US7902958B2 (en) | 2011-03-08 |
| WO2008009280A1 (de) | 2008-01-24 |
| DE102006033691A1 (de) | 2008-01-31 |
| EP2047486B1 (de) | 2011-03-09 |
| US20090179730A1 (en) | 2009-07-16 |
| DE502007006682D1 (de) | 2011-04-21 |
| JP2009544160A (ja) | 2009-12-10 |
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