JPS555546A - Detection circuit for ac supply voltage - Google Patents

Detection circuit for ac supply voltage

Info

Publication number
JPS555546A
JPS555546A JP7844778A JP7844778A JPS555546A JP S555546 A JPS555546 A JP S555546A JP 7844778 A JP7844778 A JP 7844778A JP 7844778 A JP7844778 A JP 7844778A JP S555546 A JPS555546 A JP S555546A
Authority
JP
Japan
Prior art keywords
transistor
power input
half cycle
supply voltage
conductive
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
JP7844778A
Other languages
Japanese (ja)
Inventor
Hatsuhiko Shinoda
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP7844778A priority Critical patent/JPS555546A/en
Publication of JPS555546A publication Critical patent/JPS555546A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To obtain the detection signal when the input AC supply voltage is OFF surely and with good isolation, by using a photo coupler. CONSTITUTION:When the switch 2 is closed and the power input is applied, since the photo coupler 33 is driven and the transistor 36 is conducted during a half cycle period, although the cpacitor 39 is discharged through the short circuit for the both ends, but in another half cycle, since the transistor 36 is not conductive, the capacitor 39 is charged up. The charging potential during this half cycle is set less than the potential conducting the transistor 44, then the transistor 44 is not conductive while the AC power input is applied. When the AC power input is disconnected, since the transistor 36 is OFF, the charging potential of the capacitor 39 is increased to make conductive the transistor 44 and to detect the interruption of the AC power input.
JP7844778A 1978-06-28 1978-06-28 Detection circuit for ac supply voltage Pending JPS555546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7844778A JPS555546A (en) 1978-06-28 1978-06-28 Detection circuit for ac supply voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7844778A JPS555546A (en) 1978-06-28 1978-06-28 Detection circuit for ac supply voltage

Publications (1)

Publication Number Publication Date
JPS555546A true JPS555546A (en) 1980-01-16

Family

ID=13662285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7844778A Pending JPS555546A (en) 1978-06-28 1978-06-28 Detection circuit for ac supply voltage

Country Status (1)

Country Link
JP (1) JPS555546A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920347A (en) * 1982-07-26 1984-02-02 Shin Kobe Electric Mach Co Ltd Flame-retardant resin composition

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920347A (en) * 1982-07-26 1984-02-02 Shin Kobe Electric Mach Co Ltd Flame-retardant resin composition

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