FR2363228A1 - Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor - Google Patents

Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor

Info

Publication number
FR2363228A1
FR2363228A1 FR7625772A FR7625772A FR2363228A1 FR 2363228 A1 FR2363228 A1 FR 2363228A1 FR 7625772 A FR7625772 A FR 7625772A FR 7625772 A FR7625772 A FR 7625772A FR 2363228 A1 FR2363228 A1 FR 2363228A1
Authority
FR
France
Prior art keywords
optical coupling
interface circuit
phototransistor
networks
transistor
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.)
Granted
Application number
FR7625772A
Other languages
French (fr)
Other versions
FR2363228B1 (en
Inventor
Catherine Bockel
Claude Gerbaud
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
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 Alcatel CIT SA filed Critical Alcatel CIT SA
Priority to FR7625772A priority Critical patent/FR2363228A1/en
Publication of FR2363228A1 publication Critical patent/FR2363228A1/en
Application granted granted Critical
Publication of FR2363228B1 publication Critical patent/FR2363228B1/fr
Granted 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
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
    • H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors

Abstract

The interface circuit is used to transfer signals from a HT network to a LT network, respectively coupled to a HT or LT source. The circuit comprises an input stage supplied from the HT source and employing a transistor (T1) in the DC supply circuit for a light-emitting diode, forming part of an optical coupling. The output stage of the interface circuit includes a phototransistor (PT) forming the other part of the optical coupling and associated with a second transistor (T2) so as to form a current amplifier. The transistor (T1) in the input stage has its base coupled to the circuit input via two resistors (R1, R2) and coupled to the HT source via a negative resistance (R3).
FR7625772A 1976-08-25 1976-08-25 Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor Granted FR2363228A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7625772A FR2363228A1 (en) 1976-08-25 1976-08-25 Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7625772A FR2363228A1 (en) 1976-08-25 1976-08-25 Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor

Publications (2)

Publication Number Publication Date
FR2363228A1 true FR2363228A1 (en) 1978-03-24
FR2363228B1 FR2363228B1 (en) 1979-03-02

Family

ID=9177149

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7625772A Granted FR2363228A1 (en) 1976-08-25 1976-08-25 Interface circuit between HV and LV networks - has optical coupling employing LED and phototransistor

Country Status (1)

Country Link
FR (1) FR2363228A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825896A (en) * 1972-05-01 1974-07-23 Texas Instruments Inc Computer input/output interface systems using optically coupled isolators
CA958080A (en) * 1971-03-16 1974-11-19 Pylon Electronic Development Company Ltd. Line isolator coupler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA958080A (en) * 1971-03-16 1974-11-19 Pylon Electronic Development Company Ltd. Line isolator coupler
US3825896A (en) * 1972-05-01 1974-07-23 Texas Instruments Inc Computer input/output interface systems using optically coupled isolators

Also Published As

Publication number Publication date
FR2363228B1 (en) 1979-03-02

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Legal Events

Date Code Title Description
ST Notification of lapse