EP0454904A2 - Résistance électrique de puissance - Google Patents

Résistance électrique de puissance Download PDF

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Publication number
EP0454904A2
EP0454904A2 EP90125298A EP90125298A EP0454904A2 EP 0454904 A2 EP0454904 A2 EP 0454904A2 EP 90125298 A EP90125298 A EP 90125298A EP 90125298 A EP90125298 A EP 90125298A EP 0454904 A2 EP0454904 A2 EP 0454904A2
Authority
EP
European Patent Office
Prior art keywords
carrier body
electrical power
resistance element
power resistor
cermet
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.)
Ceased
Application number
EP90125298A
Other languages
German (de)
English (en)
Other versions
EP0454904A3 (en
Inventor
Dieter Wunderlich
Ernst Karich
Claus Degel
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.)
Draloric Electronic GmbH
Original Assignee
Draloric Electronic GmbH
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 Draloric Electronic GmbH filed Critical Draloric Electronic GmbH
Publication of EP0454904A2 publication Critical patent/EP0454904A2/fr
Publication of EP0454904A3 publication Critical patent/EP0454904A3/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/01—Mounting; Supporting
    • H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath

Definitions

  • the invention relates to an electrical power resistor with a plate-shaped, electrically insulating carrier body, which has an electrically conductive layer on its underside, and a flat resistance element, which is arranged on the top of the carrier body, wherein a peripheral edge region of the carrier body is uncovered by the resistance element.
  • Such a power resistor is known from DE-OS 37 15 860.
  • the underside of the carrier body is coated with an electrically conductive paint that contains fillers such as carbon or silver.
  • the resistance element in the form of a film, a thin layer or a thick layer is applied to the top of the carrier body.
  • the resistance element and the carrier body are arranged essentially within a housing which is an electrically non-conductive Has upper part and an electrically conductive lower part which is fixedly connected to the upper part by means of screws passing through the carrier body, the carrier body being clamped between the upper part and the lower part of the housing.
  • the upper part of the housing lies directly on the uncoated edge region of the carrier body, while the electrically conductive layer on the underside of the carrier body is in contact with the surface of the lower housing part.
  • a cavity formed above the carrier body and the resistance element in the housing is partially filled with an electrically insulating casting compound which is in contact with the uncoated edge region of the carrier body.
  • the surface of the carrier body is thus only partially coated, and the uncoated surface of the carrier body is in contact with the sealing compound, the upper part of the housing, the air on the outside of the housing and with the screws which connect the upper part to the lower part of the housing. This can result in undesired partial discharges at these contact points.
  • the electrically conductive paint applied to the underside of the carrier body cannot prevent partial discharges.
  • the known electrical power resistor therefore has partial discharge exposure voltages of 1 kV to 2 kV for partial discharges ⁇ 5 pC.
  • the previously known power resistor also has a low surface load capacity of approximately 10 to 15 watts
  • the carrier body consists of at least two insulating layers arranged one above the other, between which a flat temperature compensation element made of a heat-conducting material is provided, the temperature compensation element and the associated insulation layers adjoining one another.
  • the temperature compensation element is smaller than the insulating layers, which results in exposed surface sections of the insulating layers.
  • a potting compound is also in direct contact with the exposed surface sections of the insulation layers.
  • the resistance element can be applied in the form of a thick layer of cermet on the upper side of the uppermost insulating layer of the carrier body.
  • this electrical power resistor too, the partial discharge exposure voltages are low and are also in a range from 1 kV to 2 kV for partial discharges ⁇ 5 pC. Furthermore, this electrical power resistor also has a low surface load capacity of approximately 25 watts / cm2.
  • the object of the invention is to design the generic electrical power resistor so that it is partially discharge-free with a surface load capacity that is higher than that of the known power resistors, with partial discharge freedom at partial discharge suspension voltages of> 5 kV for partial discharges ⁇ 5 pC.
  • the carrier body has all around several, forming a closed coating, different in their electrical conductivity properties, of which at least the electrically conductive layer arranged on the top of the carrier body consists of cermet and the layer covering the edge region of the carrier body consists of an electrically insulating material.
  • the power resistor according to the invention has a high surface load capacity of approximately 50 watts / cm2 with partial discharge exposure voltages of> 5 kV for partial discharges ⁇ 5 pC. Its permissible continuous operating voltage is greater than 5 kV because there are no destructive partial discharges.
  • the electrical power resistor shown in Figure 1 has a housing 1, which consists of an upper part 2 and a lower part 3, which is connected to the upper part 2 by means of screws 4 or other mechanical fastening elements, such as rivets, through the upper part 2 and the
  • the lower part 3 extends outside an interior space 5 formed in the housing 1.
  • the lower housing part 3 is good heat conductor and consists of a metal or a metal alloy such as aluminum, copper, brass or similar materials.
  • the upper housing part 2 consists of an electrically insulating material, which makes it floating.
  • the upper part of the housing can be made of the following materials, for example: glazed ceramic, leakage-proof thermoplastics and thermosets that are TE-free (TE is the abbreviation for partial discharge), e.g. polyamide reinforced, polycarbonate, melamine resin reinforced, epoxy resin reinforced, Polyphenylene sulfide or oxide.
  • a plate-shaped, electrically insulating carrier body 6 made of a ceramic material, such as e.g. Aluminum oxide, beryllium oxide, aluminum nitride, and a resistance element 7 is provided, which is arranged on the top of the carrier body 6.
  • a peripheral edge area 8 of the carrier body 6 is uncovered by the resistance element 7.
  • the resistance element 7 consists of a metal foil which is formed from a meandering band.
  • the carrier body 6 has a layer 9 of cermet on its top and bottom.
  • the cermet layers 9 are electrically conductive and have a resistance in the range from 1 k ⁇ to 50 M ⁇ .
  • the surface of the cermet layers 9 are very smooth, i.e. substantially smoother than the surface of the uncoated carrier body 6.
  • the cermet layers 9 are also gas-tight, and there are no cavities in the cermet layers 9 or between the cermet layers 9 and the carrier body 6.
  • the cermet layers 9 are produced by applying the cermet in the form of a paste to the carrier body 6 in a screen printing process and baking it after drying.
  • the cermet paste contains precious metals or their oxides, e.g. Ruthenium, and is commercially available as a resistance paste e.g. available from Du Pont under the designation "HS80".
  • the peripheral edge area 8 of the carrier body 6 is not covered by the cermet layers 9.
  • the edge area 8 of the carrier body 6 is coated with an electrically insulating glaze 10, which has a specific resistance> 105 ⁇ m.
  • the glaze 10 is also very smooth Surface, is gas-tight, has no voids and is connected to the carrier body 6 without voids.
  • the glaze 10 adjoins the cermet layers 9 without interruption, so that the glaze 10 together with the cermet layers 9 form a closed, all-round coating for the carrier body 6.
  • the lower cermet layer 9 is in contact with the lower housing part 3, while the upper cermet layer 9 is in contact with the resistance element 7.
  • a pressure distribution plate 11 which is smaller than the support body 6 and a base body 12 made of a ceramic material, such as e.g. Alumina, which is coated all around with a layer 13 of cermet.
  • a plurality of spaced apart compression springs 14 are distributed over the surface of the pressure distribution plate 11. With their upper ends, the compression springs 14 are supported on the upper housing part 2, and with their lower ends they act on the top of the pressure distribution plate 11, so that the pressure distribution plate 11 against the resistance element 7 and consequently the resistance element 7 against the upper cermet layer 9 of the carrier body 6 is pressed.
  • the upper ends of the compression springs 14 are arranged in depressions 15 which are formed in the upper housing part 2, so that the springs 14 are secured against slipping sideways.
  • the connecting pieces 16 each consist of an angular body which has a leg 17 running parallel to the upper side of the upper housing part 2, which is arranged in a recess in the upper housing part 2 and by means of a screw 18 or another mechanical fastening element, such as a rivet the upper housing part 2 is attached.
  • a screw 18 or another mechanical fastening element such as a rivet the upper housing part 2 is attached.
  • the connecting pieces 16 are connected to the resistance element 7 by electrical lines 19, each of which is guided through a bore in the upper housing part 2. Tensile and compressive forces, which may act on the connecting pieces 16, are transmitted from the connecting pieces 16 only to the upper housing part 2 and not to the electrical lines 19.
  • the lines 19 are each covered with an insulating silicone hose 20, an annular space being located between each line 19 and the associated silicone hose 20, which is filled with a potting compound 21.
  • the interior 5 of the housing 1 is also filled with the potting compound 21, so that all the components of the resistor located in the interior 5 are enclosed by the potting compound 21. Only between the lower cermet layer 9 and the lower housing part 3 and in the recesses 15 is there no potting compound 21.
  • the potting compound 21 consists of a solvent-free, filler-free, addition-crosslinking two-component silicone rubber compound of the RTV type. It has a high temperature stability> 250 ° C, a high insulation strength ⁇ 25 kV / mm, a very good thermal conductivity of 0.2 watts / mK and an extremely good wettability and adhesive strength on the adjacent surfaces.
  • the potting compound 21 is absolutely TE-free up to the breakdown voltage.
  • the electrical power resistor shown in Figure 2 differs from the power resistor shown in Figure 1 only in that instead of the pressure distribution plate 11 and the springs 14 an elastically deformable Pressure pad 22 made of a silicone rubber is provided.
  • the pressure pad 22 is elastically compressed by the upper housing part 2, its upper surface being supported on the upper housing part 2 and the lower surface acting on the resistance element 7, which is consequently pressed against the upper cermet layer 9 of the carrier body 6.
  • the silicone rubber of the pressure pad 22 has a defined conductivity with a specific resistance which is in the range> 103 ⁇ m ⁇ 107 ⁇ m.
  • the electrical power resistance shown in FIG. 3 in accordance with a third exemplary embodiment corresponds to the electrical power resistance shown in FIG. 1 in that the resistance element 7 between the plate-shaped carrier body 6, which carries a cermet layer 9 on its top and bottom, and one with a glaze 10 has coated edge area 8, un the pressure distribution plate 11 is arranged, which consists of a ceramic base body 12 which is provided with a cermet layer 13 all around.
  • the pressure distribution plate 11 and the plate-shaped carrier body 6 are kept in contact-free distance by an elastically deformable pressure transfer pad 25 made of conductive silicone rubber.
  • the pressure transfer pad 25 lies with its upper surface against the lower surface of the cermet layer 13 of the pressure distribution plate 11 and acts with its lower surface on the resistance element 7, so that the resistance element 7 is pressed against the upper cermet layer 9 on the carrier body 6.
  • the pressure is built up by springs 14, which are arranged above the pressure distribution plate 11 at a distance from one another. With their lower end they act on the upper surface of the cermet layer 13 of the pressure distribution plate and with their upper ends they are supported on the upper housing part 2.
  • the electrical power resistor shown in FIG. 4 differs from the electrical power resistors shown in FIGS. 1, 2 and 3 in particular in that no separate resistance element pressed onto the upper cermet layer 9 on the carrier body 6 is used, but rather that Resistance element is the cermet layer 9 itself applied to the upper side of the carrier body 6.
  • the cermet layer 9 thus represents a thick-film resistor.
  • connection coatings 23 At the opposite ends of the cermet layer 9 serving as a resistance element there are two connection coatings 23 on the upper side of the carrier body 6, these connection coatings 23 consisting for example of an alloy of Ag and Pd.
  • the electrical lines 19 are soldered to these connection coatings 23.
  • On the underside of the carrier body 6 there is no cermet layer but a metal alloy layer 24, e.g. Ag / Pd, which is soldered to the lower housing part 3.
  • the edge area 8 of the carrier body 6 is coated with a glaze.
  • a coating with a suitable adhesion promoter for the casting compound can also be provided.
  • the electrical power resistors according to the invention can be used for high-voltage transmission systems, mono switches, three-phase frequency converters, damping resistors for tyristors, etc., freedom from partial discharges being particularly desirable.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Resistors (AREA)
EP19900125298 1990-05-02 1990-12-21 Electrical power resistance Ceased EP0454904A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014104 1990-05-02
DE4014104A DE4014104A1 (de) 1990-05-02 1990-05-02 Elektrischer leistungswiderstand

Publications (2)

Publication Number Publication Date
EP0454904A2 true EP0454904A2 (fr) 1991-11-06
EP0454904A3 EP0454904A3 (en) 1993-01-13

Family

ID=6405589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900125298 Ceased EP0454904A3 (en) 1990-05-02 1990-12-21 Electrical power resistance

Country Status (3)

Country Link
US (1) US5208576A (fr)
EP (1) EP0454904A3 (fr)
DE (1) DE4014104A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637826A1 (fr) * 1993-08-05 1995-02-08 Mcb Industrie Composant résistif de puissance, avec dispositif d'application sous pression sur un dissipateur thermique
EP2592633A1 (fr) * 2011-11-14 2013-05-15 Cressall Resistors Limited Dispositif de résistance à refroidissement par liquide
EP3404674A1 (fr) * 2017-05-16 2018-11-21 EBG Elektronische Bauelemente GmbH Résistance de puissance
WO2019105736A1 (fr) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft Dispositif électrique de résistance de freinage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4441280C2 (de) * 1994-11-19 1998-08-27 Asea Brown Boveri Kaltleiter und Vorrichtung zur Strombegrenzung mit mindestens einem Kaltleiter
US5999083A (en) * 1999-04-26 1999-12-07 Cts Corporation Resistive controller using magnetic repulsion
DE102004025082B4 (de) * 2004-05-21 2006-12-28 Infineon Technologies Ag Elektrisch und durch Strahlung zündbarer Thyristor und Verfahren zu dessen Kontaktierung
DE102004062183B3 (de) * 2004-12-23 2006-06-08 eupec Europäische Gesellschaft für Leistungshalbleiter mbH Thyristoranordnung mit integriertem Schutzwiderstand und Verfahren zu deren Herstellung
CN107195405A (zh) * 2017-05-27 2017-09-22 广东福德电子有限公司 一种厚膜平面大功率电阻器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152689A (en) * 1978-02-13 1979-05-01 American Components Inc. Electrical resistor package which remains unaffected by ambient stresses and humidity
DE3204683A1 (de) * 1982-02-11 1983-08-18 Brown, Boveri & Cie Ag, 6800 Mannheim Einrichtung zur kuehlung von verlustwaermeerzeugenden elektrischen bzw. elektronischen bauelementen
US4716396A (en) * 1986-07-10 1987-12-29 Dale Electronics, Inc. High power density, low corona resistor
GB2218266A (en) * 1988-05-03 1989-11-08 Draloric Electronic Electrical power resistor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419564A (en) * 1981-03-30 1983-12-06 Texas Instruments Incorporated Self-regulating electric heater for use in an early fuel evaporation system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152689A (en) * 1978-02-13 1979-05-01 American Components Inc. Electrical resistor package which remains unaffected by ambient stresses and humidity
DE3204683A1 (de) * 1982-02-11 1983-08-18 Brown, Boveri & Cie Ag, 6800 Mannheim Einrichtung zur kuehlung von verlustwaermeerzeugenden elektrischen bzw. elektronischen bauelementen
US4716396A (en) * 1986-07-10 1987-12-29 Dale Electronics, Inc. High power density, low corona resistor
GB2218266A (en) * 1988-05-03 1989-11-08 Draloric Electronic Electrical power resistor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637826A1 (fr) * 1993-08-05 1995-02-08 Mcb Industrie Composant résistif de puissance, avec dispositif d'application sous pression sur un dissipateur thermique
FR2708782A1 (fr) * 1993-08-05 1995-02-10 Mcb Ind Composant résistif de puissance, avec dispositif d'application sous pression sur un dissipateur thermique.
EP2592633A1 (fr) * 2011-11-14 2013-05-15 Cressall Resistors Limited Dispositif de résistance à refroidissement par liquide
US8643464B2 (en) 2011-11-14 2014-02-04 Cressall Resistors Limited Liquid-cooled resistor device
EP3404674A1 (fr) * 2017-05-16 2018-11-21 EBG Elektronische Bauelemente GmbH Résistance de puissance
WO2018210889A1 (fr) * 2017-05-16 2018-11-22 Ebg Elektronische Bauelemente Gmbh Résistance de puissance
WO2019105736A1 (fr) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft Dispositif électrique de résistance de freinage

Also Published As

Publication number Publication date
DE4014104C2 (fr) 1993-04-08
DE4014104A1 (de) 1991-11-14
US5208576A (en) 1993-05-04
EP0454904A3 (en) 1993-01-13

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