JPS57201333A - Ac 2-line system contactless switch - Google Patents

Ac 2-line system contactless switch

Info

Publication number
JPS57201333A
JPS57201333A JP56085089A JP8508981A JPS57201333A JP S57201333 A JPS57201333 A JP S57201333A JP 56085089 A JP56085089 A JP 56085089A JP 8508981 A JP8508981 A JP 8508981A JP S57201333 A JPS57201333 A JP S57201333A
Authority
JP
Japan
Prior art keywords
voltage
current flows
current
damaged
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
JP56085089A
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 JP56085089A priority Critical patent/JPS57201333A/en
Publication of JPS57201333A publication Critical patent/JPS57201333A/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
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To protect an internal circuit from being damaged when excessive current flows by connecting a voltage detecting circuit to detect that a constant current circuit consisting of transistors and resistances operates. CONSTITUTION:At normal operation, a transistor TR9 maintains off status during the period a detecting signal (b) is ''L'' and current flows from an AC zero point into a load 3. When the load 3 is shorted, the voltage applied to both the ends of a resistance 15 is quickly increased and the base current of a TR8 starts to flow through a TR7, so that the base current of a TR6 is reduced. Since impedance between the collector and emitter of the TR6 is increased at that time, the voltage of a point (A) rises, current flows through a voltage regulating diode 12, the TR9 is turned on, and TRs 8, 6 are turned off. Thus, the TR6 can be protected from being damaged.
JP56085089A 1981-06-03 1981-06-03 Ac 2-line system contactless switch Pending JPS57201333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56085089A JPS57201333A (en) 1981-06-03 1981-06-03 Ac 2-line system contactless switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56085089A JPS57201333A (en) 1981-06-03 1981-06-03 Ac 2-line system contactless switch

Publications (1)

Publication Number Publication Date
JPS57201333A true JPS57201333A (en) 1982-12-09

Family

ID=13848872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56085089A Pending JPS57201333A (en) 1981-06-03 1981-06-03 Ac 2-line system contactless switch

Country Status (1)

Country Link
JP (1) JPS57201333A (en)

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