JPS5464452A - Signal selection unit using photo coupling circuit - Google Patents

Signal selection unit using photo coupling circuit

Info

Publication number
JPS5464452A
JPS5464452A JP13026677A JP13026677A JPS5464452A JP S5464452 A JPS5464452 A JP S5464452A JP 13026677 A JP13026677 A JP 13026677A JP 13026677 A JP13026677 A JP 13026677A JP S5464452 A JPS5464452 A JP S5464452A
Authority
JP
Japan
Prior art keywords
base
photo
emitter
circuit
turned
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
JP13026677A
Other languages
Japanese (ja)
Inventor
Tomio Kato
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP13026677A priority Critical patent/JPS5464452A/en
Publication of JPS5464452A publication Critical patent/JPS5464452A/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
    • H03K17/51—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

Landscapes

  • Electronic Switches (AREA)
  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To speed up the selective operation, by shortening the base and emitter with the SW circuit, when the photo Tr is interrupted, by constituting the selection circuit through the provision of the switching SW circuit to the base circuit of photo transistor Tr. CONSTITUTION:The base of the photo detection transistor Tr 31 is commonly connected to the collector of the selection Tr 33 via the diode 32. The first group selection signl is fed to the base of Tr33 and the emitter is grounded. The emitter of the photo Tr 31 is grounded via the diode 34, and it is connected to the power supply V2 via the resistor 35 and output signal group is picked up from the collector. When Tr33 is turned on, the base and emitter of all photo transistors 31 are shortened and compulsively turned off, then no signal delivery is made. When Tr33 is turned off, the base emitter of Tr 31 is opened, photo transistor Tr31 is operated according to the presence of the input signal to the light emitting diode 21, enabling signal delivery.
JP13026677A 1977-11-01 1977-11-01 Signal selection unit using photo coupling circuit Pending JPS5464452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13026677A JPS5464452A (en) 1977-11-01 1977-11-01 Signal selection unit using photo coupling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13026677A JPS5464452A (en) 1977-11-01 1977-11-01 Signal selection unit using photo coupling circuit

Publications (1)

Publication Number Publication Date
JPS5464452A true JPS5464452A (en) 1979-05-24

Family

ID=15030160

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13026677A Pending JPS5464452A (en) 1977-11-01 1977-11-01 Signal selection unit using photo coupling circuit

Country Status (1)

Country Link
JP (1) JPS5464452A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932225A (en) * 1982-08-16 1984-02-21 Ohkura Electric Co Ltd Power saving type multiplexer circuit
JPH02295312A (en) * 1989-04-20 1990-12-06 Babcock & Wilcox Co:The Digital/frequecy input device for industrial controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932225A (en) * 1982-08-16 1984-02-21 Ohkura Electric Co Ltd Power saving type multiplexer circuit
JPH02295312A (en) * 1989-04-20 1990-12-06 Babcock & Wilcox Co:The Digital/frequecy input device for industrial controller

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