US3427508A - Relay damping - Google Patents
Relay damping Download PDFInfo
- Publication number
- US3427508A US3427508A US570069A US3427508DA US3427508A US 3427508 A US3427508 A US 3427508A US 570069 A US570069 A US 570069A US 3427508D A US3427508D A US 3427508DA US 3427508 A US3427508 A US 3427508A
- Authority
- US
- United States
- Prior art keywords
- relay
- windings
- coil
- turns
- diodes
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
Definitions
- This invention relates to a novel arrangement for damping a reed relay of the kind used in telephone exchanges.
- Reed type relays are currently widely used in central office telephone switching equipment, and have been found to be highly advantageous because of their relatively simple and inexpensive construction, as well as their reliability and high speed operating characteristics. Some difficulty has been experienced with relays of this type, however, in utilizations where they are required to follow dialing pulses.
- reed relays tend to introduce extra pulses, that is, to pick up during disconnect intervals, resulting in the insertion of erroneous dialing information into the system.
- the causes for this appear to be relatively complex and variable, depending upon the nature of the various different lines to which the relay may be connected from time to time.
- the invention arose in the course of work on relays of the type that are used in a so-called balanced circuit, and include two coils, one of which is connected between One battery terminal and one lead of the subscribers line, the other being connected between the second battery terminal and the second lead.
- the impedances of the two coils must not only be held within very narrow limits, but the coils must be balanced so as not to disturb the electrical balance of the line and the switching system.
- any devices used to temper or modify the action of the relay must have no significant adverse effect on transmission of a voice signal.
- the operation of the relays in response to dial pulses must meet relatively stringent requirements, and only a very small margin is available to accommodate delays in pickup or drop-out.
- the diodes When applied to relays of this type, the diodes, in accordance with the invention, are connected across about one-fifth to about a quarter of the turns of each Winding in the back-wave direction.
- the shunted portions of the windings are selected to have as nearly equal resistance and inductance as possible to maintain the balance requirement. Shunting only a small portion of each winding not only ensures preservation of the electrical balance, but also minimizes the effect the diodes would otherwise have on the voice signal.
- the relay coil shown therein is bifilar, and includes two windings 10 and 12, wound together but insulated from each other.
- Each of the windings 10 and 12,,as wound foran actual coil for a reed type pulsing relay included four thousand turns of No. 35 A.W.G. insulated copper wire.
- the coil was wound on an insulated iron core, and had an inside diameter of 0.327" and a length of about 2 /2 inches.
- Both of the windings 10 and 12 were tapped at the end of the first 3100 turns, and the diodes 14 and 16 were connected in shunt across the last 900 turns.
- the diodes 14 and 16 may be of any desired type. As actually used in reducing the invention to practice, they were silicon diodes of the commercial type 1Nl694.
- the diodes 14 and 16 are oppositely oriented relative to the end terminals of the windings 10 and 12.
- the end terminals to which the diodes are connected lead ordinarily to the battery in the telephone exchange, and the opposite end terminals are arranged for connection to the subscribers line.
- Method of modifying the operating characteristics of an electromechanical relay of the type having a coil and intended to be energized by direct current comprising shunting fewer than half of the turns of the coil with a diode connected in the back-wave direction.
- Method of modifying the operating characteristics of an electromechanical relay of the type having a coil and intended to be energized by direct current comprising shunting about one-fifth to about one-quarter of the turns of the coil with a diode connected in the back-wave direction.
- An electromechanical relay comprising a coil, and a diode in shunt across fewer than one half of the turns of said coil.
- a bifilar wound electromechanical relay for use in an electrically balanced telephone switching circuit comprising a pair of diodes connected across corresponding portions of each of the respective windings of the relay, each of said diodes being in-shunt with fewer than half the turns of one of the windings.
- a relay comprising a coil having two similar windings in bifilar configuration, each of said windings having a radially inner end terminal, an intermediate terminal, and a radially outer terminal, each of said windings having at least about three times as many turns between said inner terminal and said intermediate terminal as between said intermediate terminal and said other terminal, a first diode connected between the intermediate and outer terminl'als of one of said windings with its anode connected to saidouter terminal, and a second diode connected between the intermediate and outer terminals of the other one of said windings with its cathode connected to the outer terminal.
- each of said windings includes from about 3100 to about 3200 turns, and the outer portion includes between about 900 and about 800 turns.
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- Interface Circuits In Exchanges (AREA)
Description
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US57006966A | 1966-08-03 | 1966-08-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3427508A true US3427508A (en) | 1969-02-11 |
Family
ID=24278090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US570069A Expired - Lifetime US3427508A (en) | 1966-08-03 | 1966-08-03 | Relay damping |
Country Status (1)
Country | Link |
---|---|
US (1) | US3427508A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3577065A (en) * | 1968-11-21 | 1971-05-04 | Rca Corp | Switching regulator having a diode connected to an intermediate tap of a choke |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3189796A (en) * | 1961-11-14 | 1965-06-15 | Westinghouse Electric Corp | Apparatus for suppressing transients during switching |
US3293495A (en) * | 1963-01-29 | 1966-12-20 | Omnitronics Inc | Control circuits |
-
1966
- 1966-08-03 US US570069A patent/US3427508A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3189796A (en) * | 1961-11-14 | 1965-06-15 | Westinghouse Electric Corp | Apparatus for suppressing transients during switching |
US3293495A (en) * | 1963-01-29 | 1966-12-20 | Omnitronics Inc | Control circuits |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3577065A (en) * | 1968-11-21 | 1971-05-04 | Rca Corp | Switching regulator having a diode connected to an intermediate tap of a choke |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL DYNAMICS TELEQUIPMENT CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:STROMBERG-CARLSON CORPORATION;REEL/FRAME:004157/0746 Effective date: 19821221 Owner name: UNITED TECHNOLOGIES CORPORATION, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL DYNAMICS TELEPHONE SYSTEMS CENTER INC.;REEL/FRAME:004157/0698 Effective date: 19830519 Owner name: GENERAL DYNAMICS TELEPHONE SYSTEMS CENTER INC., Free format text: CHANGE OF NAME;ASSIGNOR:GENERAL DYNAMICS TELEQUIPMENT CORPORATION;REEL/FRAME:004157/0723 Effective date: 19830124 |
|
AS | Assignment |
Owner name: STROMBERG-CARLSON CORPORATION, FLORIDA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNITED TECHNOLOGIES CORPORATION A CORPORATION OF DE;REEL/FRAME:005732/0982 Effective date: 19850605 |