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JPS57188134A - Ac two-wire type contactless switch - Google Patents

Ac two-wire type contactless switch

Info

Publication number
JPS57188134A
JPS57188134A JP56073857A JP7385781A JPS57188134A JP S57188134 A JPS57188134 A JP S57188134A JP 56073857 A JP56073857 A JP 56073857A JP 7385781 A JP7385781 A JP 7385781A JP S57188134 A JPS57188134 A JP S57188134A
Authority
JP
Japan
Prior art keywords
turns
load
wire type
contactless switch
power supply
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
JP56073857A
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 JP56073857A priority Critical patent/JPS57188134A/en
Publication of JPS57188134A publication Critical patent/JPS57188134A/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
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To protect a transistor switched at zero cross, by operating the transistor (TR) supplying a power supply to a load at a filure of load, detecting the increase in voltage drop of the said TR at a zero cross detecting circuit and turning off the said TR. CONSTITUTION:When an output of a sensor circuit 25 is at a high level and a power supply (a) is near to zero point, a TR30 turns off, an SCR36 turns on, and a switching TR6 turns on. When a current flowing to a load 3 is abnormally greater, a TR7 is operative with a voltage drop of a resistor 15 and a TR6 is at constant current operation. Thus, the potential at point (a) is increased, the TR30 turns on, TRs 29 and 28 turn off and the TR6 turns off.
JP56073857A 1981-05-16 1981-05-16 Ac two-wire type contactless switch Pending JPS57188134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56073857A JPS57188134A (en) 1981-05-16 1981-05-16 Ac two-wire type contactless switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56073857A JPS57188134A (en) 1981-05-16 1981-05-16 Ac two-wire type contactless switch

Publications (1)

Publication Number Publication Date
JPS57188134A true JPS57188134A (en) 1982-11-19

Family

ID=13530245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56073857A Pending JPS57188134A (en) 1981-05-16 1981-05-16 Ac two-wire type contactless switch

Country Status (1)

Country Link
JP (1) JPS57188134A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212384A2 (en) * 1985-08-21 1987-03-04 i f m electronic gmbh Electronic switching apparatus, preferably operated without touching it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212384A2 (en) * 1985-08-21 1987-03-04 i f m electronic gmbh Electronic switching apparatus, preferably operated without touching it

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