JPS57201318A - Voltage level detecting circuit - Google Patents

Voltage level detecting circuit

Info

Publication number
JPS57201318A
JPS57201318A JP8601181A JP8601181A JPS57201318A JP S57201318 A JPS57201318 A JP S57201318A JP 8601181 A JP8601181 A JP 8601181A JP 8601181 A JP8601181 A JP 8601181A JP S57201318 A JPS57201318 A JP S57201318A
Authority
JP
Japan
Prior art keywords
voltage
feedback
detecting circuit
inversed
point
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
JP8601181A
Other languages
Japanese (ja)
Inventor
Shoichi Kawashima
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 Telecom Networks Ltd
Original Assignee
Fujitsu Telecom Networks 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 Telecom Networks Ltd filed Critical Fujitsu Telecom Networks Ltd
Priority to JP8601181A priority Critical patent/JPS57201318A/en
Publication of JPS57201318A publication Critical patent/JPS57201318A/en
Pending 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
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To absorb vibrations of the input voltage of the titled detecting circuit, by performing AC feedback on the comparator of the voltage level detecting circuit, and rising the threshold level when the output voltage is inversed by DC feedback. CONSTITUTION:An input voltage to be compared VIN is connected to an inversed input terminal of a comparator 11 and a point PA is connected to a non-inversed input terminal, then, a relative output VOUT is obtained by comparing the voltage by using the voltage at the point PA as a reference voltage. To the point PA DC feedback is performed by resistances R1-R4 and a diode D1 and AC feedback is also performed by a condenser C1. Since the upper limit of the threshold level is risen during the time constant decided by the AC feedback is kept constant when the input voltage coincides with the lower side of the threshold level decided by the DC feedback and the output voltage is inverted, vibrations of the input voltage can be absorbed.
JP8601181A 1981-06-04 1981-06-04 Voltage level detecting circuit Pending JPS57201318A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8601181A JPS57201318A (en) 1981-06-04 1981-06-04 Voltage level detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8601181A JPS57201318A (en) 1981-06-04 1981-06-04 Voltage level detecting circuit

Publications (1)

Publication Number Publication Date
JPS57201318A true JPS57201318A (en) 1982-12-09

Family

ID=13874738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8601181A Pending JPS57201318A (en) 1981-06-04 1981-06-04 Voltage level detecting circuit

Country Status (1)

Country Link
JP (1) JPS57201318A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106299U (en) * 1983-12-23 1985-07-19 シャープ株式会社 Voltage comparison/memory circuit
JPS61116434U (en) * 1984-12-28 1986-07-23

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60106299U (en) * 1983-12-23 1985-07-19 シャープ株式会社 Voltage comparison/memory circuit
JPS61116434U (en) * 1984-12-28 1986-07-23

Similar Documents

Publication Publication Date Title
JPS5534885A (en) Switching regulator
JPS57193819A (en) Switching regulator
JPS56145775A (en) Switching control type power source circuit
JPS57201318A (en) Voltage level detecting circuit
JPS5629464A (en) Fly-back power source
JPS57135370A (en) Level detecting circuit
JPS5319080A (en) Speed detector
JPS56115024A (en) Automatic threshold level setting circuit
JPS57107618A (en) Power amplifier
JPS5411426A (en) Constant power controller for a/d converter
JPS5619383A (en) Full-wave rectifying system
JPS5514780A (en) Active filter
JPS6430423A (en) Stabilized dc power source
KR890005924Y1 (en) Arrangement for speed regulation of induction motor
JPS5743209A (en) Regulated power supply
JPS57154912A (en) High frequency detector
JPS57211981A (en) Inverter device
JPS5483743A (en) Alternating current amplifier
JPS54140573A (en) Detecting circuit for ac current
JPS57208863A (en) Switching regulator
JPS5640924A (en) Direct current constant voltage power source
JPS54139048A (en) Dc control circuit
JPS54116276A (en) Level judging circuit
JPS5471542A (en) Voltage comparator circuit
JPS553217A (en) Differential amplifier