JPS57178422A - Alternating-current two-wire type contactless switch - Google Patents

Alternating-current two-wire type contactless switch

Info

Publication number
JPS57178422A
JPS57178422A JP56062843A JP6284381A JPS57178422A JP S57178422 A JPS57178422 A JP S57178422A JP 56062843 A JP56062843 A JP 56062843A JP 6284381 A JP6284381 A JP 6284381A JP S57178422 A JPS57178422 A JP S57178422A
Authority
JP
Japan
Prior art keywords
current
output
trs
flowing
alternating
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
JP56062843A
Other languages
Japanese (ja)
Other versions
JPH0226822B2 (en
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 JP56062843A priority Critical patent/JPS57178422A/en
Publication of JPS57178422A publication Critical patent/JPS57178422A/en
Publication of JPH0226822B2 publication Critical patent/JPH0226822B2/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
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To protect a transistor (TR) for switching by bringing the TR under control for constant-current operation or for cutting-off operation in accordance with an output current and an output voltage. CONSTITUTION:Normally, TRs 28, 30, and 6 are controlled in accordance with the output of a sensor circuit 25, flowing an alternating current to a load 3. If the load 3 becomes abnormal to cause an increase in current, a voltage developed across a resistance 15 increases rapidly, and a TR7 is turning on, so that the base current of a TR6 starts flowing through the collector-emitter path of the TR7. Thus, the current flowing through the TR6 is limited for constant- current operation. At this time, the output impedance of the TR6 increases, so an output voltage rises. When the voltage rises above the threshold voltage of a Zener diode 13, the TR30 turns on and the TRs 28 and 6 turn off, thus protecting the Trs from a breakdown.
JP56062843A 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch Granted JPS57178422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56062843A JPS57178422A (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
JP56062843A JPS57178422A (en) 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch

Publications (2)

Publication Number Publication Date
JPS57178422A true JPS57178422A (en) 1982-11-02
JPH0226822B2 JPH0226822B2 (en) 1990-06-13

Family

ID=13211985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56062843A Granted JPS57178422A (en) 1981-04-25 1981-04-25 Alternating-current two-wire type contactless switch

Country Status (1)

Country Link
JP (1) JPS57178422A (en)

Also Published As

Publication number Publication date
JPH0226822B2 (en) 1990-06-13

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