CA1187953A - High capacitance bus bar including multilayer ceramic capacitors - Google Patents

High capacitance bus bar including multilayer ceramic capacitors

Info

Publication number
CA1187953A
CA1187953A CA000398599A CA398599A CA1187953A CA 1187953 A CA1187953 A CA 1187953A CA 000398599 A CA000398599 A CA 000398599A CA 398599 A CA398599 A CA 398599A CA 1187953 A CA1187953 A CA 1187953A
Authority
CA
Canada
Prior art keywords
bus bar
aperture
conductors
conductive
insulating
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.)
Expired
Application number
CA000398599A
Other languages
French (fr)
Inventor
Michael M. Gottlieb
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.)
Rogers Corp
Original Assignee
Rogers Corp
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 Rogers Corp filed Critical Rogers Corp
Application granted granted Critical
Publication of CA1187953A publication Critical patent/CA1187953A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00Installations of bus-bars
    • H02G5/005Laminated bus-bars
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49117Conductor or circuit manufacturing
    • Y10T29/49169Assembling electrical component directly to terminal or elongated conductor

Abstract

HIGH CAPACITANCE BUS BAR
INCLUDING MULTILAYER CERAMIC CAPACITORS

Abstract of the Disclosure:
A miniaturized bus bar and the method of production thereof wherein a sheet of insulating material is laminated between a pair of bus conductors and windows are provided in the laminated structure. A plurality of multilayer ceramic capacitors are inserted in the windows and alternate plates of the capacitors are electrically connected to the two bus conductors. The capacitors are comprised of alternating layers of conductive material and dielectric material.

Description

HIGH CAPACITANCE BVS BAR
. _ IN(`LUDING MULTILAYER CERAMIC CAPACITORS

Back~round of the Invention-(1) Field of the Invention This invention relates to bus bars and particularly to miniature bus bars characterized by a hlgh capacitance. More especially, this lnverl-tion relates to ~he manufacture of bus bars which incorporate multilayer capacitive elements between pairs of elongated parallel bus conductors.
According:Ly, the general objects of the present invention are -to provide novel and improved ar~lcles and methods of such character.
~2) Description of the Prior Art Conventional bus bars of relatively small or miniature size have been known in the art Eor a number of years. Such bus bar devices are used for power and/or signal distribution in many systems, such as~ for example, computer back panels and integLated circuit systems. Such prior art multilayer bus bars comprise at least two conductive plates (usually in the form of elongated strips or bars or copper) separated by an insulating film. A
typical prior ar-t bus bar of this type may use copper conductors having a thickness of about 10 mils~ and the overall dimensions of the bus bar may be from about o019 to .120 inches thick, from about 0.150 to .'~

0.200 inches wide and range in length up to about 16 inches. Typically, -the separa-ting insula-ti.ng layer is a plastic dielec-tric fi:Lm such as the polyester material known as MYL~R ~. The MYLAR separa-tor layer and -the conductive plates are bonded toge-ther by an ad-hesive. Conven-ti.onal prior art bus bars of this type have relatively low capacitance which results in the devices being comparatively ineffective in at-tenuat-ing high frequency noise. This high freqllency noise :is highly undesirable, especially when the bus bar is used for signal distribu-tion.
One prior art approach to eliminating this noise problem involves connecting capacitors to the bus bar after the completion of -the bus bar assembly. While lS -this approach raised the capacitance and minimized -the noise, it resul-ted in additional expense and time in manufacturing.
Ano-ther -type of bus bar s-tructure disclosed in the prior art involves disposing discrete high capaci-7() -ti.ve elernents between a pair of conduc-tors. These bus bars have the desi.red high capacitance. Examples of such high capacitance bus bars are disclosed in UO SO
Paterlts ~,236,038 and 4,236,046 and in Canadian Patent l,127,253, all of which are owned by the assignee o~
the present invention. The high capacitive elements utilized in those inventions are thin layers o~- chips of dielectric material, usua;lly a ceramic with a high dielectric constant. The opposing surfaces of the chips are typically coated with a thin, integral and continuous film of conductive material and these conductive films are electrically connected to res-pective c :E the bus conductors.
Summary o.E the Invention:
The present invention provides a novel and improved construction oE a minia-turized bus bar assembly and methods Eor ~he fabrication thereof.
In accordance with the present invention~
mu]t:ilayer ceramic capacitors are inserted in openings provided in a conventional bus bar structure. These capacitors have, in addition to parallel plates, transverse end plates which are connec-ted -to alternate plates within the clielectric~
rrhe transverse end plates of the capacitors are each electrically connected to a different one of the bus conductors to ob-tain the desired hlgh capacitance between the bus bar conductors.
Accordingly, the present invention has among its objects, the provision of a novel high capacitance bus bar and methods of producing such bus bars.

Brief ~escript_on of the Drawings:
Referring to the drawings, wherein like elernents are numbered alike in the several FIGURES:
FIGURE 1 is a partial top plan view oE a bus bar incorporating the present invention.
FIGURE 2 is an enlarged perspective view of one embodiment of a multilayer capacitance element Eor incorporation in the bus bar of FIGURE 1 FIGURE 3 is a cross-sectional side elevation view talcen along line 3-3 of FIGURE 1.
FIGURE 4 is an enlargement of portion 4 of the device shown in FIGURE 3.

Description of the Preferred Embodiment:
Referring to FIGURE 1, a portion of a miniature bus bar in accordance with the present invention is indicated generally at 2. The bus bar inc:Ludes a pair of elongated parallel bus conductors 22 and 22' (FIGURES 3 and 4) from which project signal distribution pins or Eingers 6 and 8, respectively.
A plurallty of multilayer capacitor elements 10 are included within bus bar 2 between the two bus condllctors as will be described in more detail hereinafter.
Referring to FIGURE 2~ a multilayer capaeitor element for use in the present invention is indicated generally at 10. Element lO is constructed of a series of eonduetive layers 12 separated by layers 13 of a material having a high dieleetric constant. The dielectric material will, in aecordanee with the preferred embodiment, be a ceramic such as barium titanate. Each conductive layer 12 has only one of its ends exposed at a side of element lO, with alternate conduetive layers 12 haviny exposed ends at the same side of element 10. Ihe pair of opposed side faces of element lO to whieh conductive layers 12 extend are metallized whereby conductive end plates 16(al and 16(b) are defined; the groups of alternating conductive layers 12 being in electrieal co~tact with end plates 16(a) and 16(b).
The multilayer capacitor elements 10 may be formed by coating portions of the opposing surfaces oE chips or wafers of the eeramie dielectrie with a conductive material, sueh as silver or a conductive adhesive, and then assembling several such layers in a multilayer array. Conduetive end plates 16(a) and 16(b) may also be comprised of silver or a concluctive adhesive. Alternatively, the multilayer capacitor elements may be formed by imbeddillg thin sheets of conductive material in the dielectrie material, with alternate sheets of eonductive material being connected to end plates 16(a) and 16(b) of the same conductive material. Multilayer capacitor elements oE the type described are commercially available Erom AVX Ceramics Corp~ of Myrtle Beaeh, South Carolina.
Referring now to FIGURES 3 and 4, a portion of a bus bar in aecordanee with the present invention is generally indicated at 18. Bus bar 18 includes an insulating ]ayer 20, such as a sheet of Mylar polyester, laminated between a pair of bus concluctors 22 and 22'. This laoinate is provided ~ith openings 24 which define willdows or pockets. Openings 24 are oE the same shape as and are slightly larger than multilayer capacitor elements 10. A capacitor element 10 is positioned within each opening 24 and is spaced Erom the bus conductors 22 and 22' so that there is no inadvertant or undesired contact between the elements 10 and the bus conductors. To assist in preventing any undesirable con-tact between the elements 10 and the bus conductors, the perimet.er oF
the openings 24 in insulating layer 20 may be smaller than the correspc)nding opening in the conductors 22 to insure that the multilayer capacitor elements 10 remain spaced from conductors 22 by a substantially ec~ual distance in all directions.
OE particular importance is the fact that the end plates 16(a) and 16(b) are spaced from the ends 25 of conductors 22 and 22' which define part of the sides of the openings 24. The desired internal capacitance oE the bus bar assembly is achieved by establishing selective contact between end plates 16 and the bus conductors 22. To that end, each of the end plates 16 is connected to a different one of the conductors 22. Thus~ by way of illustration, end plate 16(a) is connected to conductor 22 and end plate 16(b) ls connected to conductor 22' (see FIGURE 4). The connection between end plates 16 and conductors 22 is by means of any suitable conductive connection 26 which may be solder, conductive adhesive, etcO, as long as care is taken to insure that each end plate 16 is connec:ted to only one bus conductor~ The electrical. connections 26 may also be relied upon to mechanically attach the multilayer capacitor elements 10 in position in the assembly; or the elements 10 may be mechanically positioned in any other desired manner.

~'7 ~

Each bus conductor 2~ may also have an outer insulating plastic layer 28, or the entire bus bar assembly may be encapsulated in such insulating plas-ticO
Each m~ltilayer capacitor element will be connected as described above so that its oppvsite end plates are respeetively connected to separate or the bus conductors whieh are generally transversely oriented with respect to the s,aid end pla-tes. In this manner, internal capaeitanee is estahlished alon~ the entire length of the bus bar assembly.
The bus conductors of the present invention are copper elements, whieh may be tin plated; and they are approximately 10 mils thiclc and range in width or hei~ht from about 0.150 to about 0.200 inches and range in length Erom about 2 to 16 inches t depending on the particular applieation Eor the bus bar. The ceramic material, from which the multilayer capacitive elements or strip capacitors are Eormed preferably has a relatively high dielectric constant, a dieleetric eonstant in excess of 8,000 for example, ancl the thickness of the dieleetrie material may range from about 0.005 inches to about O.OL5 inches.
The capacitor elements will typically have opposed face surface dimensions, measured parallel to the planes defined by the bus eonduetors, in the range of from about n O~ inehes by 0.2 inehes to about 0.2 inches by 3.0 inches for individual elements or the multilayer capacitors may extend for the length of the bus bar assembly if in the form of ribbon capacitorsO
While preferred embodiments have been shown or described, various modifieations and substitutions may be made thereto without departing from the spirit and scope of the invention. Aeeordingly, it is to be understood that the present invention has been described by way o~ illustration and not limitatiorl.

Claims (10)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:-
1. A bus bar assembly comprising:
insulating means, said insulating means being comprised of a flat elongated strip of non-conductive material having oppositely disposed first and second faces, said insulating means being provided with at least a first aperture extending therethrough between said faces;
a first bus bar conductor, said first bus bar conductor being bonded to said first face of said insulating means, said first bus bar conductor being provided with at least a first aperture which extends therethrough, said first bus bar aperture being in registration with said first aperture of said insulating means;
a second bus bar conductor, said second bus bar conductor being bonded to said second face of said insulating means, said second bus bar conductor being provided with at least a first aperture which extends therethrough, said second bus bar aperture being in registration with said first aperture of said insulating means;
said registered apertures of said first and second bus bar conductors having a larger cross-sectional area than the aperture in said insulating means;
at least first multilayer capacitor means, said multi-layer capacitor means being comprised of a dielectric material haing a high dielectric constant, said capacitor means having a plurality of spaced end layers of conductive material on a first pair of oppositely disposed faces of said capacitor means, said capacitor means being positioned within said registered apertures of said insulating means and said first and second bus bar conductors with said end layers of conductive material being oriented substan-tially transverse to said insulating means first and second faces;
first means electrically connecting one of the conductive end layers of said capacitor means to said first bus bar conductor; and second means electrically connecting the other of the conductive end layers of said capacitor means to said second bus bar conductor.
2. The bus bar assembly of claim 1 wherein said capacitor means includes spaced conductive layers, said spaced conductive layers being arranged generally transversely with respect to said end layers, the alternate ones of said spaced conductive layers being electrically connected to opposite ones of said end layers and being spaced from said bus bar conductors.
3. The bus bar assembly of claim 1 wherein said registered apertures of said first and said second bus bar conductors have a larger cross-sectional area than the aperture in said insulating means.
4. The bus bar assembly of claim 2 wherein said registered apertures of said first and said second bus bar conductors have a larger cross-sectional area than the aperture in said insulating means.
5. The bus bar assembly of claim 1 wherein said first and said second electrical connecting means is solder.
6. The bus bar assembly of claim 1 wherein said first and said second electrical connecting means is conductive adhesive.
CLAIM 7. The bus bar assembly of claim 1 wherein said insulating means further comprises:
sheath means, said sheath means being non-conductive, said sheath means encapsulating said first and said second bus bar conductors and said capacitor means.
CLAIM 8. The apparatus of claim 2 wherein said conductors of said second pair are embedded in said dielectric material.
CLAIM 9. The bus bar assembly of claim 8 wherein said registered apertures of said first and said second bus bar conductors have a larger cross-sectional area than the aperture in said insulating means.
CLAIM 10. The bus bar assembly of claim 3 wherein said insulating means further comprises:
sheath means, said sheath means being non-conductive, said sheath means encapsulating said first and said second bus bar conductors and said capacitor means.
CA000398599A 1981-03-31 1982-03-17 High capacitance bus bar including multilayer ceramic capacitors Expired CA1187953A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/249,641 US4399321A (en) 1981-03-31 1981-03-31 High capacitance bus bar including multilayer ceramic capacitors
US249,641 1981-03-31

Publications (1)

Publication Number Publication Date
CA1187953A true CA1187953A (en) 1985-05-28

Family

ID=22944374

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000398599A Expired CA1187953A (en) 1981-03-31 1982-03-17 High capacitance bus bar including multilayer ceramic capacitors

Country Status (6)

Country Link
US (1) US4399321A (en)
BE (1) BE892687A (en)
CA (1) CA1187953A (en)
DE (1) DE3211541A1 (en)
FR (1) FR2503475B1 (en)
GB (1) GB2095892B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505789A (en) * 1981-12-28 1985-03-19 Olin Corporation Dynamic gas disengaging apparatus and method for gas separation from electrolyte fluid
IT1194301B (en) * 1983-07-06 1988-09-14 Mecondor Spa METHOD FOR HIGH CAPACITY MANUFACTURING WITH ELECTRICAL CONNECTIONS OBTAINED FOR WELDING, AND RELATED BARS PRODUCED ACCORDING TO THIS METHOD
US4494169A (en) * 1983-11-14 1985-01-15 Rogers Corporation Decoupling capacitor and method of manufacture thereof
US4499519A (en) * 1983-11-14 1985-02-12 Rogers Corporation Decoupling capacitor and method of manufacture thereof
US4517406A (en) * 1984-05-14 1985-05-14 Eldre Components, Inc. Laminated bus bar containing multilayer ceramic capacitors
DE200670T1 (en) * 1985-05-03 1987-07-23 Rogers Corp., Rogers, Conn., Us DECOUPLING CAPACITOR AND METHOD FOR THE PRODUCTION THEREOF.
US4594641A (en) * 1985-05-03 1986-06-10 Rogers Corporation Decoupling capacitor and method of formation thereof
US4599486A (en) * 1985-09-06 1986-07-08 Rogers Corporation High capacitance bus bar including multilayer ceramic capacitors
US4748537A (en) * 1986-04-24 1988-05-31 Rogers Corporation Decoupling capacitor and method of formation thereof
US4834673A (en) * 1987-05-14 1989-05-30 Amp Incorporated Flat cable power distribution system
US5142439A (en) * 1991-08-28 1992-08-25 Allied-Signal Inc. Integrated bus bar/multilayer ceramic capacitor module
US5185690A (en) * 1991-10-16 1993-02-09 Miller Mark L High dielectric constant sheet material
DE10251639A1 (en) * 2002-10-31 2004-05-13 E.G.O. Elektro-Gerätebau GmbH Sensor element device for a capacitive touch switch with an electrically conductive body and method for producing such a body
US9552926B2 (en) * 2014-01-30 2017-01-24 Hamilton Sundstrand Corporation Multilayer capacitor with integrated busbar
WO2018195454A1 (en) 2017-04-20 2018-10-25 De Rochemont L Pierre Resonant high energy density storage device
US11332087B2 (en) 2018-06-04 2022-05-17 Westinghouse Air Brake Technologies Corporation Phase module assembly of a multi-phase inverter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346444A (en) * 1964-08-24 1967-10-10 Gen Electric Electrically conductive polymers and process of producing the same
US4001150A (en) * 1970-11-25 1977-01-04 Kansai Paint Company, Ltd. Composition for preparing electroconductive resin comprising an unsaturated polyester and phosphoric or sulfonic unsaturated ester
US4101952A (en) * 1976-08-17 1978-07-18 Sprague Electric Company Monolithic base-metal glass-ceramic capacitor
JPS6021451B2 (en) * 1977-10-08 1985-05-28 日本メクトロン株式会社 Laminated busbar with built-in capacitor

Also Published As

Publication number Publication date
BE892687A (en) 1982-07-16
GB2095892B (en) 1984-11-28
DE3211541A1 (en) 1982-11-04
FR2503475A1 (en) 1982-10-08
US4399321A (en) 1983-08-16
FR2503475B1 (en) 1986-03-14
GB2095892A (en) 1982-10-06

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