WO1988003718A1 - Filter electrical connector with transient suppression - Google Patents

Filter electrical connector with transient suppression Download PDF

Info

Publication number
WO1988003718A1
WO1988003718A1 PCT/US1987/002859 US8702859W WO8803718A1 WO 1988003718 A1 WO1988003718 A1 WO 1988003718A1 US 8702859 W US8702859 W US 8702859W WO 8803718 A1 WO8803718 A1 WO 8803718A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
shell
connector
ground
filter
Prior art date
Application number
PCT/US1987/002859
Other languages
French (fr)
Inventor
Edward R. Gliha
Original Assignee
Amphenol Corporation
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 Amphenol Corporation filed Critical Amphenol Corporation
Publication of WO1988003718A1 publication Critical patent/WO1988003718A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
    • H01R13/7197—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters with filters integral with or fitted onto contacts, e.g. tubular filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H01R13/6666—Structural association with built-in electrical component with built-in electronic circuit with built-in overvoltage protection

Definitions

  • This invention relates to a filter electrical connector with transient suppression.
  • Such a filter connector while suitable for the purposes then intended, does not protect the user from voltage spikes which are of extraordinarily short duration and having sharp waveforms. It would be desirable to have a connector which filters undesired frequencies and protects its circuits from unpredictable voltage pulses which are severe but transient in nature. Diodes are known as circuit elements which will hold a signal line to a specific voltage for which it is designed. However diodes are normally externally mounted on circuit boards and technology has only recently considered their incorporation into the internal structure of matable cylindrical connectors.
  • This invention relates to an electrical connector assembly which contains a silicon diode for transient overvoltage protection and a tubular ceramic filter for EMI protection.
  • the diode can be unipolar or bipolar and is attached to the output side of the-contact and is designed to divert overvoltages having extremely fast rise times to shell ground instead of being passed to the system into which the connector is incorporated.
  • the circuit protection provided defines a pi filter.
  • FIGURE 1 is a partial section view in elevation, with parts broken away, of a connector shell having an arrangement for filtering and protecting signals passing through its contacts therein from transient signals.
  • FIGURE 2 is an enlarged view in section of a contact in the connector of FIGURE 1.
  • FIGURE 3 is an electrical circuit diagram of the connector arrangement.
  • FIGURE 1 shows an electrical connector 10 which comprises a cylindrical metal shell 12 and carries electrical contacts 20.
  • the shell is hollow from end to end and has a pair of flanges 16, 18 extending radially inward from its inner wall 14.
  • Disposed in the shell for supporting the contacts is a forward insert assembly 24, a rearward insert assembly 34, a forward and a rearward grounding assembly 40, and a cylindrical metal spacer ring 52 for spacing the grounding assemblies from one another.
  • An array of passages extend through the assemblies for passing the contacts.
  • the contact 20 includes a mating forward end 22, a wire receiving rearward end 24, and a pair of spaced circuit elements 54, 74, one circuit element comprising a filter element 54 adjacent the forward end 22 and the other circuit element comprising a silicon diode 74 adjacent the rearward end 74, the filter element receiving and filtering the input signal and the silicon diode passing the signal if it does not exceed a certain voltage but diverting the signal to shell ground if the signal does exceed a certain voltage.
  • the filter element being the first circuit element for protecting the contact, due to impedance factors and the nature of voltage spikes it may in some applications be desirable to reverse their positions on the contact.
  • the forward support assembly 24 supports the forward ends 22 of the contacts and comprises an epoxy disc 30, a dielectric insert 28 of plastic, an interfacial seal 26 of soft elastomeric material, and a seal 32 of elastomeric material.
  • the rearward support assembly 34 supports the rearward ends 24 of the contacts and comprises a seal 36 of soft elastomeric material, and an epoxy disc 38.
  • the grounding assembly 40 comprises a bottle-cap shaped grounding spring 48 having its outer wall slitted to define a plurality of spring tines 50 and being sized to receive a plated insulative wafer 42, each having an array of passages therethrough to pass the respective contacts.
  • the wafer 42 arranges a plurality of spring fingers 44 annularly around each of its passages to engage the outer periphery of the contact.
  • the spring tines 50 complete an electrical circuit path between the shell and the wafer and the spring fingers 44 complete an electrical circuit path between the wafer and the contact.
  • One grounding assembly 40 is positioned forwardly in the shell such that its spring fingers 44 engage the circuit element 54 and the other grounding assembly 40 is positioned rearwardly in the shell such that its spring fingers 44 engage the circuit element 74.
  • the metal spacer ring 52 is disposed between and contacts each of the grounding assembly 40 to complete an electrical circuit path therebetween.
  • the metal shell 12 constitutes an electrical ground and, as will be discussed, the circuit elements 54, 74 are connected to the electrical ground through their respective grounding assembly.
  • FIGURE 2 is an enlarged view in section of a contact in the connector shell.
  • the electrical contact 20 is generally cylindrical and includes the spaced circuit elements 54, 74.
  • Circuit element 54 is a filter element and comprises a center conductor (the * contact body 20), a ferrite sleeve 56 to cause the center conductor to exhibit series inductance, a dielectric ceramic sleeve 58 disposed coaxially of the center conductor, and electrodes 60, 62, and 64 .
  • Electrode 60 is the ground electrode and comprises a continuous metal layer on the outside surface of ceramic sleeve 58. Electrodes 62, 64 are the active electrodes each forming a continuous metal layer that is disposed on the inside surface of the ceramic sleeve 58 and which extends onto the outside surface of the ceramic sleeve. The active electrodes are separated from one another on the inside surface by a marginal space 66 and also are separated from one another on the outside surface and the ground electrode 60 by a coated marginal space 68, such space preferably being coated to inhibit flash-over between the electrodes.
  • Circuit element 74 comprises a silicon diode 82 being soldered at 88 into a notch 90 of the contact, a tubular insulator 76 being fitted about the contact body, and a metallic sleeve 78 being fitted about the insulator and having a tab 80 extending., therefrom.
  • a pair of terminals 84, 86 extend outwardly from the silicon diode 82 with terminal 84 (e.g., an cathode) being soldered at 87 to the tab 80 and terminal 86 (e.g., an anode) being soldered at 88 to the contact adjacent to its rearward end 24.
  • the circuit elements 54, 74 are grounded to the shell 12 as a result of the spring fingers 44 from the forward grounding assembly engaging the circuit element 54 and the spring fingers 44 from the rearward grounding assembly engaging the circuit element 74.
  • the spacer ring 52 makes electrical contact between and spaces each grounding assembly 40 in the shell 12.
  • FIGURE 3 shows the circuit diagram representing the structural elements.
  • the capacitor element 54 includes the contact body 20 and exhibits series inductance because of the ferrite sleeve 56, the active electrode 62 being connected to the input of the contact 20, the ground electrode 60 being grounded to the shell 12, and the active electrode 64 being connected to the output of the contact.
  • the silicon diode 74 is connected to the contact 20 adjacent to its output by solder 88 and is grounded to the shell through the solder 87 between tab 80 and terminal 84.
  • the signal passes through the circuit element 54 but bypasses the silicon diode 74. If the signal is a DC voltage it passes through to the output. An AC voltage passes through the contact until the frequency reaches the cut-off of the filter whereupon it is attenuated by the filter.
  • the output When an overvoltage is presented to the contact the output is protected by the silicon diode and will hold the line to a specific voltage level for which it was designed.
  • all voltage greater than the turn on voltage of the diode is converted to current and dissipated as heat to ground through the diode.
  • the voltage across the diode does not decrease below its turn on voltage unless the source voltage drops or the diodes fail as a short.
  • the filter Placing the filter as the input has an advantage that it operates as an rf sink to ground to dissipate high rf energy.
  • the connector arrangement shown describes a contact with a bipolar diode and a pi filter. However it is to be understood that the diode can be. unipolar and the filter can be "L", "T M or straight capacitance if desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

A filter connector having a metal shell (12), a contact (20) mounted in the shell for passing a signal therethrough, a filter element (54) and a silicon diode (82) mounted on the contact and in electrical circuit relation therewith, and ground means (40) for grounding the contact to the shell, the silicon diode for preventing voltages which exceed a predetermined value from passing through the contact.

Description

FILTER ELECTRICAL CONNECTOR WITH TRANSIENT SUPPRESSION
This invention relates to a filter electrical connector with transient suppression.
With the advent of solid state electronics there has developed a serious concern about the effects of transient voltage pulses (e.g., electrostatic discharges (ESD), nuclear electromagnetic pulses (EMP) and lightening). U.S. Patent 4,275,945, the specification and figures thereof being specifically incorporated by reference herein, issued June 30, 1981 to Krantz, Jr. et al for a "Filter Connector With Compound Filter Elements" and showed separate ground plates electrically grounding each of two filter elements.
Such a filter connector, while suitable for the purposes then intended, does not protect the user from voltage spikes which are of extraordinarily short duration and having sharp waveforms. It would be desirable to have a connector which filters undesired frequencies and protects its circuits from unpredictable voltage pulses which are severe but transient in nature. Diodes are known as circuit elements which will hold a signal line to a specific voltage for which it is designed. However diodes are normally externally mounted on circuit boards and technology has only recently considered their incorporation into the internal structure of matable cylindrical connectors.
This invention relates to an electrical connector assembly which contains a silicon diode for transient overvoltage protection and a tubular ceramic filter for EMI protection. The diode can be unipolar or bipolar and is attached to the output side of the-contact and is designed to divert overvoltages having extremely fast rise times to shell ground instead of being passed to the system into which the connector is incorporated. In particular, the circuit protection provided defines a pi filter.
The invention will now be described, by way of example, with reference to the following drawings in which:
FIGURE 1 is a partial section view in elevation, with parts broken away, of a connector shell having an arrangement for filtering and protecting signals passing through its contacts therein from transient signals.
FIGURE 2 is an enlarged view in section of a contact in the connector of FIGURE 1.
FIGURE 3 is an electrical circuit diagram of the connector arrangement. Turning now to the drawings, FIGURE 1 shows an electrical connector 10 which comprises a cylindrical metal shell 12 and carries electrical contacts 20. The shell is hollow from end to end and has a pair of flanges 16, 18 extending radially inward from its inner wall 14. Disposed in the shell for supporting the contacts is a forward insert assembly 24, a rearward insert assembly 34, a forward and a rearward grounding assembly 40, and a cylindrical metal spacer ring 52 for spacing the grounding assemblies from one another. An array of passages extend through the assemblies for passing the contacts.
The contact 20 includes a mating forward end 22, a wire receiving rearward end 24, and a pair of spaced circuit elements 54, 74, one circuit element comprising a filter element 54 adjacent the forward end 22 and the other circuit element comprising a silicon diode 74 adjacent the rearward end 74, the filter element receiving and filtering the input signal and the silicon diode passing the signal if it does not exceed a certain voltage but diverting the signal to shell ground if the signal does exceed a certain voltage. Although the arrangement shows the filter element being the first circuit element for protecting the contact, due to impedance factors and the nature of voltage spikes it may in some applications be desirable to reverse their positions on the contact.
The forward support assembly 24 supports the forward ends 22 of the contacts and comprises an epoxy disc 30, a dielectric insert 28 of plastic, an interfacial seal 26 of soft elastomeric material, and a seal 32 of elastomeric material. The rearward support assembly 34 supports the rearward ends 24 of the contacts and comprises a seal 36 of soft elastomeric material, and an epoxy disc 38.
The grounding assembly 40 comprises a bottle-cap shaped grounding spring 48 having its outer wall slitted to define a plurality of spring tines 50 and being sized to receive a plated insulative wafer 42, each having an array of passages therethrough to pass the respective contacts. The wafer 42 arranges a plurality of spring fingers 44 annularly around each of its passages to engage the outer periphery of the contact. The spring tines 50 complete an electrical circuit path between the shell and the wafer and the spring fingers 44 complete an electrical circuit path between the wafer and the contact. One grounding assembly 40 is positioned forwardly in the shell such that its spring fingers 44 engage the circuit element 54 and the other grounding assembly 40 is positioned rearwardly in the shell such that its spring fingers 44 engage the circuit element 74.
The metal spacer ring 52 is disposed between and contacts each of the grounding assembly 40 to complete an electrical circuit path therebetween. The metal shell 12 constitutes an electrical ground and, as will be discussed, the circuit elements 54, 74 are connected to the electrical ground through their respective grounding assembly. FIGURE 2 is an enlarged view in section of a contact in the connector shell. The electrical contact 20 is generally cylindrical and includes the spaced circuit elements 54, 74. Circuit element 54 is a filter element and comprises a center conductor (the* contact body 20), a ferrite sleeve 56 to cause the center conductor to exhibit series inductance, a dielectric ceramic sleeve 58 disposed coaxially of the center conductor, and electrodes 60, 62, and 64 . Electrode 60 is the ground electrode and comprises a continuous metal layer on the outside surface of ceramic sleeve 58. Electrodes 62, 64 are the active electrodes each forming a continuous metal layer that is disposed on the inside surface of the ceramic sleeve 58 and which extends onto the outside surface of the ceramic sleeve. The active electrodes are separated from one another on the inside surface by a marginal space 66 and also are separated from one another on the outside surface and the ground electrode 60 by a coated marginal space 68, such space preferably being coated to inhibit flash-over between the electrodes. A solder clad metal washer 70, 72, respectively, connects the active electrode 62, 64 to the contact adjacent to its forward end 22.
Circuit element 74 comprises a silicon diode 82 being soldered at 88 into a notch 90 of the contact, a tubular insulator 76 being fitted about the contact body, and a metallic sleeve 78 being fitted about the insulator and having a tab 80 extending., therefrom. A pair of terminals 84, 86 extend outwardly from the silicon diode 82 with terminal 84 (e.g., an cathode) being soldered at 87 to the tab 80 and terminal 86 (e.g., an anode) being soldered at 88 to the contact adjacent to its rearward end 24. The circuit elements 54, 74 are grounded to the shell 12 as a result of the spring fingers 44 from the forward grounding assembly engaging the circuit element 54 and the spring fingers 44 from the rearward grounding assembly engaging the circuit element 74. The spacer ring 52 makes electrical contact between and spaces each grounding assembly 40 in the shell 12.
FIGURE 3 shows the circuit diagram representing the structural elements. The capacitor element 54 includes the contact body 20 and exhibits series inductance because of the ferrite sleeve 56, the active electrode 62 being connected to the input of the contact 20, the ground electrode 60 being grounded to the shell 12, and the active electrode 64 being connected to the output of the contact. The silicon diode 74 is connected to the contact 20 adjacent to its output by solder 88 and is grounded to the shell through the solder 87 between tab 80 and terminal 84.
When a normal signal not representative of an overvoltage is received from the input, the signal passes through the circuit element 54 but bypasses the silicon diode 74. If the signal is a DC voltage it passes through to the output. An AC voltage passes through the contact until the frequency reaches the cut-off of the filter whereupon it is attenuated by the filter.
When an overvoltage is presented to the contact the output is protected by the silicon diode and will hold the line to a specific voltage level for which it was designed. For a DC voltage, all voltage greater than the turn on voltage of the diode is converted to current and dissipated as heat to ground through the diode. The voltage across the diode does not decrease below its turn on voltage unless the source voltage drops or the diodes fail as a short. For an AC voltage, the same result would obtain as that described above relating to frequency cut off and conducted to ground. Placing the filter as the input has an advantage that it operates as an rf sink to ground to dissipate high rf energy. The connector arrangement shown describes a contact with a bipolar diode and a pi filter. However it is to be understood that the diode can be. unipolar and the filter can be "L", "TM or straight capacitance if desired.

Claims

Having described the invention what is claimed is:
1. In a filter connector of the type having a metal shell, a contact mounted in the shell for passing a signal therethrough, and ground means for grounding the contact to the shell, the improvement comprising a filter element and means for protecting the signal from voltages exceeding a predetermined value electrically mounted on and electrically connected to the contact.
2. The connector as recited in Claim 1 wherein said means comprises a silicon diode connected electrically to the contact and to the shell.
3. The connector as recited in Claim 2 wherein the contact is longitudinally extending and includes an input for receiving the signal and an output for passing the signal, the filter element is disposed adjacent to the input, and the silicon diode is disposed adjacent to the output, both the filter element and the silicon diode being spaced and separately grounded to the shell.
4. The connector as recited in Claim 1 wherein the filter element and the silicon diode each have metallic outer periphery for completing an electrical circuit path to ground, each outer periphery being defined by a like diameter and each being coaxial relative to the contact axis.
5. The connector as recited in Claim 2 wherein the silicon diode comprises a cylindrical metal sleeve having a tab extending radially inward therefrom and in electrical circuit contact to the shell ground, a silicon chip, a pair of metal terminals extending from the chip one soldered to the contact and the other soldered to the tab whereby to complete an electrical path to the shell ground.
6. An electrical filter connector assembly comprising: a metallic shell defining an electrical ground, an elongated generally cylindrical electrically conductive contact element mounted in the shell, said contact having a forward and rearward end portion each portion being adapted to be electrically connected to the shell ground, first and second electrically conductive spring members each defining a central aperture and the apertures being coaxially aligned for receiving the contact element inserted therethrough, one said spring member completing a circuit path with said forward end portion and the other said spring member completing a circuit path with the rearward end portion, and circuit protection means for protecting a signal received by said contact element, said protection means comprising a capacitor element on one said end portion and a diode element on the other said end portion, the circuit protection means being in electrical circuit relation with the contact element and with the shell ground.
7. The connector as recited in Claim 6 wherein the capacitor element and diode elements are generally cylindrical, each having a conductive outer periphery coaxial to the contact element primary axis and defined by a like diameter, and the capacitor element is forward to the diode element and receives an input signal.
PCT/US1987/002859 1986-11-03 1987-11-03 Filter electrical connector with transient suppression WO1988003718A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/926,478 US4747789A (en) 1986-11-03 1986-11-03 Filter electrical connector with transient suppression
US926,478 1986-11-03

Publications (1)

Publication Number Publication Date
WO1988003718A1 true WO1988003718A1 (en) 1988-05-19

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Family Applications (1)

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PCT/US1987/002859 WO1988003718A1 (en) 1986-11-03 1987-11-03 Filter electrical connector with transient suppression

Country Status (3)

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US (1) US4747789A (en)
EP (1) EP0288551A4 (en)
WO (1) WO1988003718A1 (en)

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EP0516522A2 (en) * 1991-05-29 1992-12-02 Amphenol Corporation Reverse current biased diode connector

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DE8810281U1 (en) * 1988-08-12 1989-12-07 Schaltbau GmbH, 8000 München A connector part that can be attached to a device wall, such as a plug or socket
GB2225904B (en) * 1988-11-23 1992-12-23 Amphenol Corp Filter contact for an electrical connector
GB8907141D0 (en) * 1989-03-30 1989-05-10 Oxley Dev Co Ltd Electrical connectors
US4954794A (en) * 1989-04-10 1990-09-04 Itt Corporation Filter contact
US5163853A (en) * 1991-05-10 1992-11-17 Amphenol Corporation High density MLV contact assembly
US5167537A (en) * 1991-05-10 1992-12-01 Amphenol Corporation High density mlv contact assembly
US5198958A (en) * 1991-06-03 1993-03-30 Amphenol Corporation Transient suppression component
US5195014A (en) * 1991-06-03 1993-03-16 Amphenol Corporation Transient suppression component
US5188543A (en) * 1991-08-15 1993-02-23 Amphenol Corporation Electrical connector including a removable circuit component
US5112253A (en) * 1991-08-15 1992-05-12 Amphenol Corporation Arrangement for removably mounting a transient suppression or electrical filter device in an electrical connector
US5190479A (en) * 1991-09-30 1993-03-02 Honeywell Inc. Electrical connector incorporating EMI/RFI/EMP isolation
US5201855A (en) * 1991-09-30 1993-04-13 Ikola Dennis D Grid system matrix for transient protection of electronic circuitry
DE69117543T2 (en) * 1991-10-17 1996-10-24 Itt CONNECTORS WITH INTERCHANGEABLE CONTACTS
US5219296A (en) * 1992-01-08 1993-06-15 Amp Incorporated Modular connector assembly and method of assembling same
US5248266A (en) * 1992-09-15 1993-09-28 Itt Coporation Connector with sealed component contact
US5498180A (en) * 1992-10-05 1996-03-12 Amphenol Corporation Diode/filter connector
US5304964A (en) * 1993-01-08 1994-04-19 Honeywell Inc. Electrical connector incorporating ground shield spacer
US5286224A (en) * 1993-05-10 1994-02-15 Itt Corporation Interchangeable contact connector
US6080020A (en) * 1998-05-28 2000-06-27 The Whitaker Corporation Ground plane for a filtered electrical connector
US6120326A (en) * 1999-10-21 2000-09-19 Amphenol Corporation Planar-tubular composite capacitor array and electrical connector
US6402555B1 (en) 2000-04-25 2002-06-11 Christiana Industries, Llc Incandescent lamp socket with integral filter
US6547596B1 (en) * 2000-05-30 2003-04-15 Amphenol-Tuchel Electronics Gmbh Filtered electrical connector with ferrite member and coil
US7118416B2 (en) * 2004-02-18 2006-10-10 John Mezzalingua Associates, Inc. Cable connector with elastomeric band
US7633283B2 (en) * 2005-07-01 2009-12-15 The Boeing Company Method for lightning strike protection and verification of magnetizable dielectric inserts
US8786996B1 (en) 2013-11-22 2014-07-22 Extreme Broadband Engineering, Llc Methods and devices for protecting CATV circuits from combination and ring waves
JP7147572B2 (en) * 2019-01-15 2022-10-05 住友電装株式会社 connector

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP0516522A2 (en) * 1991-05-29 1992-12-02 Amphenol Corporation Reverse current biased diode connector
EP0516522A3 (en) * 1991-05-29 1993-04-14 Amphenol Corporation Reverse current biased diode connector

Also Published As

Publication number Publication date
US4747789A (en) 1988-05-31
EP0288551A1 (en) 1988-11-02
EP0288551A4 (en) 1989-02-23

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