JPS57178421A - Alternating-current two-wire type contactless switch - Google Patents

Alternating-current two-wire type contactless switch

Info

Publication number
JPS57178421A
JPS57178421A JP56062842A JP6284281A JPS57178421A JP S57178421 A JPS57178421 A JP S57178421A JP 56062842 A JP56062842 A JP 56062842A JP 6284281 A JP6284281 A JP 6284281A JP S57178421 A JPS57178421 A JP S57178421A
Authority
JP
Japan
Prior art keywords
current
turn
rises
alternating
voltage
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
JP56062842A
Other languages
Japanese (ja)
Inventor
Yasuyuki Watanabe
Ryoichi Miyake
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.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
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 Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP56062842A priority Critical patent/JPS57178421A/en
Publication of JPS57178421A publication Critical patent/JPS57178421A/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
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To protect a circuit by limiting an output current when a load short- circuits, and cutting off the output current when an output voltage further rises. CONSTITUTION:For example, a transistor (TR) 29 turns on and consequently TRs 28 and 6 turn on, allowing a current to start flowing. At this time, if a load 3 short-cjrcuits, the current increases suddenly. Then, a voltage across a resistance 15 rises and the base current of a TR6 is reduced so that a TR7 turns on. As a dresult, the collector-emitter current of the TR6 is limited to perform constant-current operation. At this time, the collector-emitter impedance of the TR6 is high, so a voltage at a terminal (a) rises. Therefore, a current flows to a Zener diode 12 to turn on a TR30. Then, the TRs28 and 6 turn off, thus protecting the circuit.
JP56062842A 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch Pending JPS57178421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56062842A JPS57178421A (en) 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56062842A JPS57178421A (en) 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch

Publications (1)

Publication Number Publication Date
JPS57178421A true JPS57178421A (en) 1982-11-02

Family

ID=13211959

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56062842A Pending JPS57178421A (en) 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch

Country Status (1)

Country Link
JP (1) JPS57178421A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6034292A (en) * 1983-07-30 1985-02-21 ファナック株式会社 Hanger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6034292A (en) * 1983-07-30 1985-02-21 ファナック株式会社 Hanger

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