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GB916007A - Proximity switch system - Google Patents

Proximity switch system

Info

Publication number
GB916007A
GB916007A GB2630061A GB2630061A GB916007A GB 916007 A GB916007 A GB 916007A GB 2630061 A GB2630061 A GB 2630061A GB 2630061 A GB2630061 A GB 2630061A GB 916007 A GB916007 A GB 916007A
Authority
GB
United Kingdom
Prior art keywords
transistor
conductive
diode
relay
oscillator
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
GB2630061A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2630061A priority Critical patent/GB916007A/en
Priority to FR870186A priority patent/FR1298057A/en
Publication of GB916007A publication Critical patent/GB916007A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9545—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/64—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors having inductive loads
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9547—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable amplitude
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

916,007. Transistor circuits. YAMAMOTO, M., and ABE, A. July 20, 1961, No. 26300/61. Class 40 (6). [Also in Group XXXVI] In apparatus for detecting the presence of conductive or magnetic bodies of the type described in Specification 910,630, extra stages are provided to control a motor-controlling relay 6. The sensing coil 8 forms part of a 1000 kc/s. oscillator 1 the output of which is normally taken across a resonant circuit 2 tuned to the same frequency, negative halfcycles being passed by a diode 22 to maintain transistor 26 conductive. Transistor 27, forming part of a Schmitt trigger circuit, is therefore non-conductive, transistor 28 conductive and transistor 40 non-conductive so that the relay 6 is not energized. When an iron or non- ferrous body is brought within the vicinity of the sensing coil 8, the frequency of oscillator 7 is changed so that the voltage passed by diode 22 is insufficient to maintain transistor 26 conductive. The Schmitt trigger circuit comprising transistor 27, 28 changes state, rendering transistor 40 conductive and energizing relay 6. The supply voltage is stabilized by a Zener diode 47.
GB2630061A 1961-07-20 1961-07-20 Proximity switch system Expired GB916007A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2630061A GB916007A (en) 1961-07-20 1961-07-20 Proximity switch system
FR870186A FR1298057A (en) 1961-07-20 1961-08-07 Approach switch system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2630061A GB916007A (en) 1961-07-20 1961-07-20 Proximity switch system

Publications (1)

Publication Number Publication Date
GB916007A true GB916007A (en) 1963-01-16

Family

ID=10241469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2630061A Expired GB916007A (en) 1961-07-20 1961-07-20 Proximity switch system

Country Status (1)

Country Link
GB (1) GB916007A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842882A1 (en) * 1977-10-20 1979-04-26 Oerlikon Buehrle Ag STRIKER ON ONE FLOOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842882A1 (en) * 1977-10-20 1979-04-26 Oerlikon Buehrle Ag STRIKER ON ONE FLOOR

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