JPS6464527A - Protecting circuit for communication equipment - Google Patents

Protecting circuit for communication equipment

Info

Publication number
JPS6464527A
JPS6464527A JP21942687A JP21942687A JPS6464527A JP S6464527 A JPS6464527 A JP S6464527A JP 21942687 A JP21942687 A JP 21942687A JP 21942687 A JP21942687 A JP 21942687A JP S6464527 A JPS6464527 A JP S6464527A
Authority
JP
Japan
Prior art keywords
ground
surge voltage
side terminal
line side
lightning surge
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.)
Pending
Application number
JP21942687A
Other languages
Japanese (ja)
Inventor
Shunji Kobayashi
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP21942687A priority Critical patent/JPS6464527A/en
Publication of JPS6464527A publication Critical patent/JPS6464527A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To suppress electrostatic capacity between a line and the ground, by constituting a protection circuit with two sets of single phase rectifying bridge circuits and overvoltage protection elements. CONSTITUTION:Upon occurrence of input lightning surge voltage between a line side terminal OP-T and the ground G, surge current flows through a diode D1a and Zener diodes 2D1e, D1d to the ground G. Since output voltages from D1a, D1b are low, almost all lightning surge voltage is clamped by the output voltage from ZD1e. Surge voltage in negative direction also flows through G, D1b, ZD1e, D1c to the line side terminal OP-T. Upon occurrence of input lightning surge voltage between a line side terminal OP-R and the ground G, second single-phase rectifying bridge circuit functions similarly. Since electrostatic capacitance is low and no resistor is included in such arrangement, a protection circuit for high speed digital signal can be realized.
JP21942687A 1987-09-01 1987-09-01 Protecting circuit for communication equipment Pending JPS6464527A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21942687A JPS6464527A (en) 1987-09-01 1987-09-01 Protecting circuit for communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21942687A JPS6464527A (en) 1987-09-01 1987-09-01 Protecting circuit for communication equipment

Publications (1)

Publication Number Publication Date
JPS6464527A true JPS6464527A (en) 1989-03-10

Family

ID=16735208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21942687A Pending JPS6464527A (en) 1987-09-01 1987-09-01 Protecting circuit for communication equipment

Country Status (1)

Country Link
JP (1) JPS6464527A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0562150U (en) * 1992-01-30 1993-08-13 北陸電力株式会社 Surge protection device for communication lines
JP2014517668A (en) * 2011-05-27 2014-07-17 メルセン ユーエスエー ニューベリーポート―エムエー，エルエルシー Electrostatic surge protection device
JP2014147264A (en) * 2013-01-30 2014-08-14 Fujitsu Ltd Surge protection circuit and communication device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0562150U (en) * 1992-01-30 1993-08-13 北陸電力株式会社 Surge protection device for communication lines
JP2014517668A (en) * 2011-05-27 2014-07-17 メルセン ユーエスエー ニューベリーポート―エムエー，エルエルシー Electrostatic surge protection device
JP2014147264A (en) * 2013-01-30 2014-08-14 Fujitsu Ltd Surge protection circuit and communication device

Similar Documents

Publication Publication Date Title
CA1266883A (en) Protector circuit
US4661878A (en) Overvoltage protection circuit
SE9001626D0 (en) Surge voltage and current protection with high ground balance
ATE48343T1 (en) FILTER CIRCUIT WITH ZNO OVERVOLTAGE ARRESTERS.
EP0186873B1 (en) Protector circuit
EP0093544B1 (en) Improvements in and relating to electrostatic precipitators
WO1991009467A1 (en) Gate drive for insulated gate device
CA2002311A1 (en) Overvoltage protection circuits
EP0259178A3 (en) Circuit protection arrangement
GB1574078A (en) Voltage-limiting circuit
JPS6464527A (en) Protecting circuit for communication equipment
FI79427B (en) KOPPLINGSANORDNING FOER OEVERSPAENNINGSSKYDD VID ANSLUTNINGSKOPPLINGAR.
US4656554A (en) Shunt arrangement with power overload protection by a voltage responsive bidirectional switch
SE461001B (en) COUPLING FOR COMPENSATION OF REACTIVE EFFECT IN A VOLTAGE TENSION
ZA848759B (en) Voltage surge arrester circuits
EP0050966B1 (en) Protection circuit for a power distribution system
KR100962340B1 (en) Surge protection device for communication line
US4340785A (en) Ringing signal supply
US4734937A (en) Telephone installation
EP0393333A2 (en) Telephone lines overvoltage protection circuit
EP0372673A3 (en) Telephone protection circuit
SU1259402A1 (en) Device for voltage overload protection
CN220085305U (en) Constant current source circuit and test circuit
SU1394310A1 (en) A.c.relay
CS240280B1 (en) Multilevel power supply overvoltage fuse