JPS57175962A - Detecting and resetting circuit for voltage drop - Google Patents

Detecting and resetting circuit for voltage drop

Info

Publication number
JPS57175962A
JPS57175962A JP56062137A JP6213781A JPS57175962A JP S57175962 A JPS57175962 A JP S57175962A JP 56062137 A JP56062137 A JP 56062137A JP 6213781 A JP6213781 A JP 6213781A JP S57175962 A JPS57175962 A JP S57175962A
Authority
JP
Japan
Prior art keywords
electric potential
turns
power source
capacitor
voltage
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
JP56062137A
Other languages
Japanese (ja)
Other versions
JPH0334025B2 (en
Inventor
Masaya Yoshikawa
Seiichi Urita
Yasuyuki Suzuki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56062137A priority Critical patent/JPS57175962A/en
Publication of JPS57175962A publication Critical patent/JPS57175962A/en
Publication of JPH0334025B2 publication Critical patent/JPH0334025B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To eliminate the need of adjusting a reference voltage circuit, by a method wherein an electric potential, being generated at a time when an input power source voltage is brought to a normal condition, is stored in a capacitor, and the electric potential is compared with an input power source voltage via a transistor. CONSTITUTION:If a power source is turned ON, a transistor (Tr)Q1 is brought to On, and charge is stored in a capacitor C3 to increase a voltage. If charge is sufficiently stored in the capacitor C3 in due course, an electric potential at point (a) becomes high, a Tr Q3 turns ON, and a Tr Q4 turns OFF to release a reset signal. During said period, a current flows to also the base of the Tr Q1 to charge a capacitor C2, and the base electric potential of the Tr Q1 goes to a specified electric potential which is lower than a power source voltage by a specified voltage. Then, if the power source voltage drops, the Tr Q1 turns OFF, and thereby, the electric potential at the point (a) falls, the Tr Q3 turns OFF, and the Tr Q4 turns ON to output a reset signal from an output terminal 3. This eliminates the need for a special reference voltage circuit and also eliminates the need to regulate an element for reference voltage.
JP56062137A 1981-04-24 1981-04-24 Detecting and resetting circuit for voltage drop Granted JPS57175962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56062137A JPS57175962A (en) 1981-04-24 1981-04-24 Detecting and resetting circuit for voltage drop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56062137A JPS57175962A (en) 1981-04-24 1981-04-24 Detecting and resetting circuit for voltage drop

Publications (2)

Publication Number Publication Date
JPS57175962A true JPS57175962A (en) 1982-10-29
JPH0334025B2 JPH0334025B2 (en) 1991-05-21

Family

ID=13191389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56062137A Granted JPS57175962A (en) 1981-04-24 1981-04-24 Detecting and resetting circuit for voltage drop

Country Status (1)

Country Link
JP (1) JPS57175962A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131071U (en) * 1983-02-19 1984-09-03 株式会社日本テクナ−ト voltage monitoring device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55155984U (en) * 1978-10-31 1980-11-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55155984U (en) * 1978-10-31 1980-11-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131071U (en) * 1983-02-19 1984-09-03 株式会社日本テクナ−ト voltage monitoring device

Also Published As

Publication number Publication date
JPH0334025B2 (en) 1991-05-21

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