JPS57185726A - Isolation type digital signal input circuit - Google Patents

Isolation type digital signal input circuit

Info

Publication number
JPS57185726A
JPS57185726A JP56070075A JP7007581A JPS57185726A JP S57185726 A JPS57185726 A JP S57185726A JP 56070075 A JP56070075 A JP 56070075A JP 7007581 A JP7007581 A JP 7007581A JP S57185726 A JPS57185726 A JP S57185726A
Authority
JP
Japan
Prior art keywords
pulse
pulse transformer
primary side
digital signal
signal input
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
JP56070075A
Other languages
Japanese (ja)
Other versions
JPS6210447B2 (en
Inventor
Keiichi Tomizawa
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
Fuji Facom Corp
Original Assignee
Fuji Electric Co Ltd
Fuji Facom Corp
Fuji Electric Manufacturing 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, Fuji Facom Corp, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP56070075A priority Critical patent/JPS57185726A/en
Publication of JPS57185726A publication Critical patent/JPS57185726A/en
Publication of JPS6210447B2 publication Critical patent/JPS6210447B2/ja
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
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/601—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors using transformer coupling

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To prevent the read pulse applied to the secondary side of a pulse transformer from being affected on the primary side, by providing a constant voltage diode for an emitter of a transistor (Tr) short-circuiting the primary side of a pulse transformer. CONSTITUTION:When a switch 7 is closed, a Tr turns on and short-circuits the primary side 13a of a pulse transformer 13. In this case, when a read pulse RD is applied, since an impedance viewed from the secondary side 13b of the pulse transformer 13 is small, a flip-flop 11 is set to a low level. With the switch 7 opened and the Tr in off-state, when the pulse RD is applied, a voltage induced at the primary side of the pulse transformer 13 is cut with a constant voltage diode Z and no base current flows to the Tr. Then, flip-flop 11 can read high level without error.
JP56070075A 1981-05-12 1981-05-12 Isolation type digital signal input circuit Granted JPS57185726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070075A JPS57185726A (en) 1981-05-12 1981-05-12 Isolation type digital signal input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070075A JPS57185726A (en) 1981-05-12 1981-05-12 Isolation type digital signal input circuit

Publications (2)

Publication Number Publication Date
JPS57185726A true JPS57185726A (en) 1982-11-16
JPS6210447B2 JPS6210447B2 (en) 1987-03-06

Family

ID=13421055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070075A Granted JPS57185726A (en) 1981-05-12 1981-05-12 Isolation type digital signal input circuit

Country Status (1)

Country Link
JP (1) JPS57185726A (en)

Also Published As

Publication number Publication date
JPS6210447B2 (en) 1987-03-06

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