JPS55137724A - Timer circuit - Google Patents

Timer circuit

Info

Publication number
JPS55137724A
JPS55137724A JP4562479A JP4562479A JPS55137724A JP S55137724 A JPS55137724 A JP S55137724A JP 4562479 A JP4562479 A JP 4562479A JP 4562479 A JP4562479 A JP 4562479A JP S55137724 A JPS55137724 A JP S55137724A
Authority
JP
Japan
Prior art keywords
relay
resistance
capacitor
prescribed
becomes
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
JP4562479A
Other languages
Japanese (ja)
Other versions
JPS596085B2 (en
Inventor
Shigeru Shiragaki
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.)
Azbil Corp
Original Assignee
Azbil Corp
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 Azbil Corp filed Critical Azbil Corp
Priority to JP4562479A priority Critical patent/JPS596085B2/en
Publication of JPS55137724A publication Critical patent/JPS55137724A/en
Publication of JPS596085B2 publication Critical patent/JPS596085B2/en
Expired 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
    • H03K17/28—Modifications for introducing a time delay before switching

Landscapes

  • Relay Circuits (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To improve a fail-safe property for the fault of a circuit element by comparing set times of three time constant circuits mutually and by driving an output relay only when relation among them is within a prescribed range. CONSTITUTION:When switch S1 is turned on, capacitor C2 is charged through resistance R2, and the charging potential becomes the Zener voltage of Zener diode D1 at prescribed set time T3, and the base bias is given to transistor Tr Q1. Meanwhile, when the set time dependent upon resistance R1, relay K, resistance R3, and capacitor C3 becomes T4, Tr Q2 becomes conductive to charge capacitor C1 to a prescribed voltage after set time T5. If set times are so set that they may satisfy T3>T4+T5, Tr Q1 is conductive after that, and electric charge of C1 is discharged through relay K, Tr Q1, and diode D2, and this discharging current and the current flowed to resistance R1 are flowed to relay K and is pulled in. By this relation among set times, relay K is not operated for the fault of any part.
JP4562479A 1979-04-14 1979-04-14 timer circuit Expired JPS596085B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4562479A JPS596085B2 (en) 1979-04-14 1979-04-14 timer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4562479A JPS596085B2 (en) 1979-04-14 1979-04-14 timer circuit

Publications (2)

Publication Number Publication Date
JPS55137724A true JPS55137724A (en) 1980-10-27
JPS596085B2 JPS596085B2 (en) 1984-02-09

Family

ID=12724516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4562479A Expired JPS596085B2 (en) 1979-04-14 1979-04-14 timer circuit

Country Status (1)

Country Link
JP (1) JPS596085B2 (en)

Also Published As

Publication number Publication date
JPS596085B2 (en) 1984-02-09

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