JPS578457A - Generating circuit for power source determination signal - Google Patents

Generating circuit for power source determination signal

Info

Publication number
JPS578457A
JPS578457A JP8329780A JP8329780A JPS578457A JP S578457 A JPS578457 A JP S578457A JP 8329780 A JP8329780 A JP 8329780A JP 8329780 A JP8329780 A JP 8329780A JP S578457 A JPS578457 A JP S578457A
Authority
JP
Japan
Prior art keywords
power source
voltage
determination signal
turned
capacitor
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
JP8329780A
Other languages
Japanese (ja)
Inventor
Kojiro Yamada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8329780A priority Critical patent/JPS578457A/en
Publication of JPS578457A publication Critical patent/JPS578457A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/468—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC characterised by reference voltage circuitry, e.g. soft start, remote shutdown

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To make the delay time at the turning on of power source long without prolonging the delay time when power source is turned off by connecting a detecting capacitor to a DC output through a rectifier. CONSTITUTION:When a power source 1 is turned on, a transistor 7 is turned on and off by AC input voltage but since there is a rectifier 18, the capacitor 11 is not immediately charged until the DC output voltage E0 by a DC power source circuit 17 rises. When the voltage of the capacitor 11 attains reference voltage V1, a power source determination signal E1 is transmitted from a comparator 14. When the power source is cut off, the voltage Vc of the capacitor 11 can attain the reference voltage V1 early, and the power source determination signal E1 ceases. Thereby, the delay time at the turning on is made longer by as much as the time till rising of the DC output voltage E0 when power source is turned on, and the delay time when the power source is cut is made short.
JP8329780A 1980-06-19 1980-06-19 Generating circuit for power source determination signal Pending JPS578457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8329780A JPS578457A (en) 1980-06-19 1980-06-19 Generating circuit for power source determination signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8329780A JPS578457A (en) 1980-06-19 1980-06-19 Generating circuit for power source determination signal

Publications (1)

Publication Number Publication Date
JPS578457A true JPS578457A (en) 1982-01-16

Family

ID=13798457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8329780A Pending JPS578457A (en) 1980-06-19 1980-06-19 Generating circuit for power source determination signal

Country Status (1)

Country Link
JP (1) JPS578457A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920312U (en) * 1982-07-22 1984-02-07 ティーディーケイ株式会社 voltage monitoring circuit
JPS5928713U (en) * 1982-08-16 1984-02-22 沖電気工業株式会社 Power supply output voltage confirmation signal sending circuit
JPS60239816A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument
JPS63238566A (en) * 1987-03-27 1988-10-04 Fuji Elelctrochem Co Ltd Method for detecting alternating current input voltage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920312U (en) * 1982-07-22 1984-02-07 ティーディーケイ株式会社 voltage monitoring circuit
JPS5928713U (en) * 1982-08-16 1984-02-22 沖電気工業株式会社 Power supply output voltage confirmation signal sending circuit
JPS60239816A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument
JPS63238566A (en) * 1987-03-27 1988-10-04 Fuji Elelctrochem Co Ltd Method for detecting alternating current input voltage

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