CA1175587A - Overvoltage protection for a line circuit - Google Patents
Overvoltage protection for a line circuitInfo
- Publication number
- CA1175587A CA1175587A CA000394202A CA394202A CA1175587A CA 1175587 A CA1175587 A CA 1175587A CA 000394202 A CA000394202 A CA 000394202A CA 394202 A CA394202 A CA 394202A CA 1175587 A CA1175587 A CA 1175587A
- Authority
- CA
- Canada
- Prior art keywords
- diode
- voltage
- amplifier
- diodes
- line
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8100242A NL8100242A (nl) | 1981-01-20 | 1981-01-20 | Overspanningsbeveiliging van een lijncircuit. |
NL8100242 | 1981-01-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1175587A true CA1175587A (en) | 1984-10-02 |
Family
ID=19836888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000394202A Expired CA1175587A (en) | 1981-01-20 | 1982-01-14 | Overvoltage protection for a line circuit |
Country Status (12)
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3215551A1 (de) * | 1982-04-26 | 1983-10-27 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung fuer den ueberspannungsschutz von schnittstellenschaltungen |
CA1233583A (en) * | 1985-06-18 | 1988-03-01 | Francis Y. Hung | Protection arrangement for a telephone subscriber line interface circuit |
US4782480A (en) * | 1985-11-19 | 1988-11-01 | Alcatel Usa, Corp. | Telephone line access apparatus |
US4868876A (en) * | 1986-05-27 | 1989-09-19 | Siemens Aktiengesellschaft | Electrostatic discharge protection device |
US4991051A (en) * | 1986-09-12 | 1991-02-05 | Northern Telecom Limited | Protection arrangements for communications lines |
GB2225908B (en) * | 1988-11-11 | 1993-01-13 | Texas Instruments Ltd | Improvements in or relating to overvoltage protection circuits |
JP2838836B2 (ja) * | 1990-04-26 | 1998-12-16 | 富士通株式会社 | 半導体集積回路及び半導体集積回路装置 |
US5384603A (en) * | 1993-09-28 | 1995-01-24 | Multiplex Technology, Inc. | Video signal splitter with DC short circuit protection |
DE4402461A1 (de) * | 1994-01-28 | 1995-08-03 | Sel Alcatel Ag | Schutzschaltung für eine Teilnehmeranschlußschaltung sowie Teilnehmeranschlußschaltung damit |
US5539820A (en) * | 1994-10-06 | 1996-07-23 | Northern Telecom Limited | Protection of active telephone line interface circuits |
JPH1146120A (ja) * | 1997-07-25 | 1999-02-16 | Mitsubishi Electric Corp | 差動増幅回路 |
US6061445A (en) * | 1997-09-15 | 2000-05-09 | Conexant Systems, Inc. | Surge protection data access arrangement (DAA) |
US5862031A (en) * | 1997-11-26 | 1999-01-19 | Analog Devices, Inc. | ESD protection circuit for integrated circuits having a bipolar differential input |
TW437231B (en) * | 1999-09-03 | 2001-05-28 | Ericsson Telefon Ab L M | Method and arrangement for shortening the recovery time of a line driver |
US6400541B1 (en) * | 1999-10-27 | 2002-06-04 | Analog Devices, Inc. | Circuit for protection of differential inputs against electrostatic discharge |
DE10042336B4 (de) * | 2000-08-29 | 2006-02-16 | Tenovis Gmbh & Co. Kg | Schnittstelle für eine Telefonverbindung mit einer steuerbaren Spannungsversorgung |
US7266154B2 (en) | 2002-05-10 | 2007-09-04 | The Southwestern Bell Telephone Co. | Digital subscriber line induction neutralizing transformer network |
US7944669B2 (en) * | 2007-06-29 | 2011-05-17 | Zareba Systems, Inc. | Electric fence energizer lightning protection |
JP5550844B2 (ja) * | 2009-03-30 | 2014-07-16 | ラピスセミコンダクタ株式会社 | 半導体集積回路 |
US8705728B2 (en) * | 2010-09-20 | 2014-04-22 | Microsemi Semiconductor (U.S.) Inc. | Shared protection scheme for multiple variable batteries |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3564338A (en) * | 1967-08-03 | 1971-02-16 | Fujitsu Ltd | Overvoltage and overcurrent protective circuit for a transistor amplifier |
US3486124A (en) * | 1968-06-04 | 1969-12-23 | Hewlett Packard Co | Power supply amplifier having means for protecting the output transistors |
GB1563802A (en) * | 1975-11-10 | 1980-04-02 | Post Office | Electronic current feed circuit |
SU614521A1 (ru) * | 1976-06-08 | 1978-07-05 | Предприятие П/Я Р-6947 | Двухтактный усилитель с защитой от перегрузки |
JPS5348405A (en) * | 1976-10-15 | 1978-05-01 | Hitachi Ltd | Lighting surge protective method of exchange |
NL7614118A (nl) * | 1976-12-20 | 1978-06-22 | Philips Nv | Schakeling voor het beschermen van telefoon- lijnen. |
DE2659044C3 (de) * | 1976-12-27 | 1981-07-16 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zum Schutz eines gegengekoppelten zweistufigen Verstärkers gegen Überlastung und Kurzschluß |
US4315304A (en) * | 1977-12-27 | 1982-02-09 | Kyber Engineering, Inc. | Starting circuit for a high frequency magnetic amplifier power supply |
FR2437757A2 (fr) * | 1978-06-26 | 1980-04-25 | Trt Telecom Radio Electr | Joncteur d'abonne destine a assurer un couplage en deux fils ou quatre fils avec un central telephonique |
SE414357B (sv) * | 1978-08-17 | 1980-07-21 | Asea Ab | Overspenningsskydd for skydd av halvledarkomponenter av lageffekttyp |
FR2437123A1 (fr) * | 1978-09-19 | 1980-04-18 | Thomson Ericsson Telephones So | Nouveau dispositif d'alimentation electronique |
NL7902160A (nl) * | 1979-03-20 | 1980-09-23 | Philips Nv | Eindversterker met niet-lineaire tegenkoppeling. |
NL7903664A (nl) * | 1979-05-10 | 1980-11-12 | Philips Nv | Lijncircuit. |
NL7903662A (nl) * | 1979-05-10 | 1980-11-12 | Philips Nv | Lijncircuit. |
FR2460078B1 (fr) * | 1979-06-25 | 1986-12-12 | Trt Telecom Radio Electr | Joncteur d'abonne electronique |
US4331994A (en) * | 1979-09-28 | 1982-05-25 | Borg-Warner Corporation | Shootthrough fault protection system for a voltage source transistor inverter |
-
1981
- 1981-01-20 NL NL8100242A patent/NL8100242A/nl not_active Application Discontinuation
- 1981-04-06 US US06/251,460 patent/US4440980A/en not_active Expired - Fee Related
-
1982
- 1982-01-14 CA CA000394202A patent/CA1175587A/en not_active Expired
- 1982-01-14 DE DE19823200828 patent/DE3200828A1/de not_active Withdrawn
- 1982-01-15 IT IT19140/82A patent/IT1150102B/it active
- 1982-01-15 GB GB8201110A patent/GB2091521B/en not_active Expired
- 1982-01-18 BE BE0/207080A patent/BE891818A/fr not_active IP Right Cessation
- 1982-01-18 AU AU79579/82A patent/AU547336B2/en not_active Ceased
- 1982-01-18 BR BR8200234A patent/BR8200234A/pt unknown
- 1982-01-18 FR FR8200684A patent/FR2498389A1/fr active Granted
- 1982-01-18 SE SE8200230A patent/SE464327B/sv not_active IP Right Cessation
- 1982-01-20 JP JP617982A patent/JPS57138256A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
AU7957982A (en) | 1982-07-29 |
US4440980A (en) | 1984-04-03 |
SE464327B (sv) | 1991-04-08 |
GB2091521A (en) | 1982-07-28 |
SE8200230L (sv) | 1982-07-21 |
IT8219140A0 (it) | 1982-01-15 |
AU547336B2 (en) | 1985-10-17 |
NL8100242A (nl) | 1982-08-16 |
BR8200234A (pt) | 1982-11-09 |
JPS57138256A (en) | 1982-08-26 |
DE3200828A1 (de) | 1982-08-19 |
IT1150102B (it) | 1986-12-10 |
BE891818A (fr) | 1982-07-19 |
FR2498389A1 (fr) | 1982-07-23 |
FR2498389B1 (US08063081-20111122-C00044.png) | 1984-11-09 |
GB2091521B (en) | 1984-09-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEC | Expiry (correction) | ||
MKEX | Expiry |