GB1358610A - Electronic threshold switch - Google Patents

Electronic threshold switch

Info

Publication number
GB1358610A
GB1358610A GB5547372A GB5547372A GB1358610A GB 1358610 A GB1358610 A GB 1358610A GB 5547372 A GB5547372 A GB 5547372A GB 5547372 A GB5547372 A GB 5547372A GB 1358610 A GB1358610 A GB 1358610A
Authority
GB
United Kingdom
Prior art keywords
diode
voltage
dec
glow
monitored
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.)
Expired
Application number
GB5547372A
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.)
TDK Micronas GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
ITT Industries Inc
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 Deutsche ITT Industries GmbH, ITT Industries Inc filed Critical Deutsche ITT Industries GmbH
Publication of GB1358610A publication Critical patent/GB1358610A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger
    • H03K3/2897—Bistables with hysteresis, e.g. Schmitt trigger with an input circuit of differential configuration
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
    • H03K3/037—Bistable circuits
    • H03K3/0377—Bistables with hysteresis, e.g. Schmitt trigger
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/42—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Led Devices (AREA)

Abstract

1358610 Transistor switching circuits ITT INDUSTRIES Inc 1 Dec 1972 [2 Dec 1971] 55473/72 Heading H3T [Also in Division G1] A threshold circuit having a light-emitting diode to indicate its state, is characterized in that the forward voltage drop across the lightemitting diode is used as the reference or threshold level for the circuit. In the preferred embodiment, Fig. 3, the voltage to be monitored is applied to the left-hand terminal A of a differential amplifier having a common emitter load R e , and the forward voltage dropped across a light-emitting diode LD is applied to the right-hand input B. In operation a small standing current is allowed to flow through the diode LD by a resistor R so as to provide the reference potential to point B, this small current being insufficient to make the diode glow. When the voltage to be monitored on terminal A rises above the reference voltage a transistor T4 conducts causing sufficient additional current to flow through the diode to cause it to glow, thereby indicating the change of state of the threshold circuit.
GB5547372A 1971-12-02 1972-12-01 Electronic threshold switch Expired GB1358610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712159760 DE2159760C3 (en) 1971-12-02 1971-12-02 Electronic threshold switch

Publications (1)

Publication Number Publication Date
GB1358610A true GB1358610A (en) 1974-07-03

Family

ID=5826796

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5547372A Expired GB1358610A (en) 1971-12-02 1972-12-01 Electronic threshold switch

Country Status (3)

Country Link
DE (1) DE2159760C3 (en)
FR (1) FR2164195A5 (en)
GB (1) GB1358610A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121632A (en) * 1982-04-28 1983-12-21 Sony Corp Signal comparing circuits

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1344794A (en) * 1972-07-20 1974-01-23 Itt Creed Isolation equipment for telegraphic apparatus
CH639521B (en) * 1980-05-28 Ebauches Electroniques Sa VOLTAGE LEVEL DETECTOR CIRCUIT.
CN104820126B (en) * 2015-05-20 2017-12-15 中国一冶集团有限公司 Detection and the method and apparatus for suppressing control loop relay induced voltage failure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121632A (en) * 1982-04-28 1983-12-21 Sony Corp Signal comparing circuits

Also Published As

Publication number Publication date
DE2159760C3 (en) 1979-11-15
DE2159760B2 (en) 1976-07-08
DE2159760A1 (en) 1973-06-07
FR2164195A5 (en) 1973-07-27

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees