JPS55165040A - Power supply unit for driving circuit in common transmission line - Google Patents

Power supply unit for driving circuit in common transmission line

Info

Publication number
JPS55165040A
JPS55165040A JP7335479A JP7335479A JPS55165040A JP S55165040 A JPS55165040 A JP S55165040A JP 7335479 A JP7335479 A JP 7335479A JP 7335479 A JP7335479 A JP 7335479A JP S55165040 A JPS55165040 A JP S55165040A
Authority
JP
Japan
Prior art keywords
power supply
voltage
driving circuit
transmission line
common transmission
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
JP7335479A
Other languages
Japanese (ja)
Inventor
Hideto Yamane
Tatsuo Morimoto
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
Nippon Electric Co Ltd
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7335479A priority Critical patent/JPS55165040A/en
Publication of JPS55165040A publication Critical patent/JPS55165040A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/16—Modifications for eliminating interference voltages or currents

Landscapes

  • Small-Scale Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To prevent the noise applied at the application and disconnection of power supply to the common transmission line, by providing the means delaying the leading of the power supply voltage and quickening the trailing of it to hold the driving circuit in nonoperation state. CONSTITUTION:When the power supply switch in ON and the voltage A of the terminal 21 of the power supply unit reaches a value, the phototransistor TR26 is conductive, TR32 is inconductive and TR36 is conductive, and the voltage B at the power supply terminal 29 appears at the power supply terminal 19 as the voltage C, and the delay time until this voltage C appears is selected longer than the time when the point t1 of power supply application until the time point t2 where the peripheral circuit is stable for the operation. This is because the operation of the driving circuit is stable from the time point t4 when the voltage C exceeds V2. Further, when the power supply to the driving circuit is disconnected, the trailing of the power supply voltage A to the peripheral circuit (time point t7) is delayed more than the trailing of the power supply voltage C (time point t6). Thus, the production of noise to the common transmission line at the application and disconnection of the power supply of the driving circuit can be prevented.
JP7335479A 1979-06-11 1979-06-11 Power supply unit for driving circuit in common transmission line Pending JPS55165040A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7335479A JPS55165040A (en) 1979-06-11 1979-06-11 Power supply unit for driving circuit in common transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7335479A JPS55165040A (en) 1979-06-11 1979-06-11 Power supply unit for driving circuit in common transmission line

Publications (1)

Publication Number Publication Date
JPS55165040A true JPS55165040A (en) 1980-12-23

Family

ID=13515736

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7335479A Pending JPS55165040A (en) 1979-06-11 1979-06-11 Power supply unit for driving circuit in common transmission line

Country Status (1)

Country Link
JP (1) JPS55165040A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60172456U (en) * 1984-04-25 1985-11-15 日本電気株式会社 interface circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60172456U (en) * 1984-04-25 1985-11-15 日本電気株式会社 interface circuit

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