JPS5660357A - Voltage detecting circuit - Google Patents

Voltage detecting circuit

Info

Publication number
JPS5660357A
JPS5660357A JP13633579A JP13633579A JPS5660357A JP S5660357 A JPS5660357 A JP S5660357A JP 13633579 A JP13633579 A JP 13633579A JP 13633579 A JP13633579 A JP 13633579A JP S5660357 A JPS5660357 A JP S5660357A
Authority
JP
Japan
Prior art keywords
voltage
ref
power source
reference value
zener diode
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
JP13633579A
Other languages
Japanese (ja)
Inventor
Kazuyuki Takahashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13633579A priority Critical patent/JPS5660357A/en
Publication of JPS5660357A publication Critical patent/JPS5660357A/en
Pending legal-status Critical Current

Links

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  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE: To make it possible to obtain a binary signal easily with a simple circuit constitution and detect the power source voltage, which fluctuated beyond the reference value, under variance reduced, by adding a Zener diode to the photo coupler system.
CONSTITUTION: When input voltage Vin of power source 1 exceeds the total value of voltage VZ applied to Zener diode 5 and voltage drop components VF dependent upon LED 3a of photo coupler 3, a current flows rapidly to saturate transistor 3b of coupler 3, and output Vout becomes the ground level at the point of reference value Vref. Consequently, diode 5 which mekes Vref=VZ+VF true is selected and connected to the power source system to obtain binary output voltage Vout with reference value Vref as the boundary.
COPYRIGHT: (C)1981,JPO&Japio
JP13633579A 1979-10-24 1979-10-24 Voltage detecting circuit Pending JPS5660357A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13633579A JPS5660357A (en) 1979-10-24 1979-10-24 Voltage detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13633579A JPS5660357A (en) 1979-10-24 1979-10-24 Voltage detecting circuit

Publications (1)

Publication Number Publication Date
JPS5660357A true JPS5660357A (en) 1981-05-25

Family

ID=15172803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13633579A Pending JPS5660357A (en) 1979-10-24 1979-10-24 Voltage detecting circuit

Country Status (1)

Country Link
JP (1) JPS5660357A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62265576A (en) * 1986-05-13 1987-11-18 Fuji Electric Co Ltd Low voltage detecting circuit
JPS6340064U (en) * 1986-09-01 1988-03-15
JPH02133752U (en) * 1989-04-06 1990-11-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62265576A (en) * 1986-05-13 1987-11-18 Fuji Electric Co Ltd Low voltage detecting circuit
JPS6340064U (en) * 1986-09-01 1988-03-15
JPH02133752U (en) * 1989-04-06 1990-11-06

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