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GB1423311A - Electronic proximity switching unit - Google Patents

Electronic proximity switching unit

Info

Publication number
GB1423311A
GB1423311A GB312173A GB312173A GB1423311A GB 1423311 A GB1423311 A GB 1423311A GB 312173 A GB312173 A GB 312173A GB 312173 A GB312173 A GB 312173A GB 1423311 A GB1423311 A GB 1423311A
Authority
GB
United Kingdom
Prior art keywords
thyristor
cathode
oscillator
voltage
stage
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
GB312173A
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
Publication of GB1423311A publication Critical patent/GB1423311A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/101—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
    • G01V3/102—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil by measuring amplitude
    • 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
    • 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
    • H03K17/951—Measures for supplying operating voltage to the detector circuit
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electromagnetism (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Power Conversion In General (AREA)
  • Electronic Switches (AREA)

Abstract

1423311 Proximity switch R BUCK 22 Jan 1973 [22 Jan 1972] 3121/73 Heading G1N A proximity actuated switch unit 1, is joined by an external lead 2 to a pole 3 of a voltage source 4 and by only one other lead 5 to a load 6 and comprises an oscillator 10 arranged to be inductively coupled by proximity of an external object e.g. a metal object; a thyristor 12 controlled by the oscillator via a triggering stage 11; a feed circuit 13 for the oscillator and triggering stage having a Zener diode 16 connected between the cathode 14 of the thyristor and the negative pole 15 of the D.C. which is to be switched by the thyristor, an auxiliary resistor 17 of a relatively high ohmic value e.g. 150 K#, a reservoir capacitor 18, a coupling diode 19, the cathode of the thyristor being triggered in use to turn-on the thyristor by connecting the cathode of the thyristor through a path of relatively low resistance, formed by a cathode resistor 28 (1 K#) and the collector-emitter path 23 of a triggering transistor 24 to the negative pole 15 of the D.C. supply, and the gate 20 of the thyristor being connected to the reservoir capacitor 18 to provide a potential only slightly above that of the negative pole 15 but sufficient to turn on the thyristor. It is stated that no voltage higher than the Zener voltage of Zener diode 16 is needed to turn on the thyristor and that no voltage spikes such as those represented in outline in Fig. 3 (not shown) are obtained. Fig. 3 represents the total voltage drop across a switching unit as in Fig. 1 but including the prior art. feed circuit of Fig. 2 (not shown). In an alternative embodiment Fig. 5 (not shown) a decoup- ling diode (29) is connected between the thyristor cathode and that of Zener diode 16 and acts so that the potential of the reservoir capacitor 18 is no longer affected by the triggering transistor 24 when it conducts so that the potential supplied to the oscillator 10 and stage 11 is sufficient even for voltages at pole 22 as low as 40 volts. In a third embodiment Fig. 6 (not shown) the voltage supply to the oscillator 10 and stage 11 is taken across a further Zener diode (30). In a fourth embodiment Fig. 7 (not shown) both gate and cathode of the thyristor 12 are triggered.
GB312173A 1972-01-22 1973-01-22 Electronic proximity switching unit Expired GB1423311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722203038 DE2203038C3 (en) 1972-01-22 1972-01-22 Electronic, contactless switching device

Publications (1)

Publication Number Publication Date
GB1423311A true GB1423311A (en) 1976-02-04

Family

ID=5833739

Family Applications (1)

Application Number Title Priority Date Filing Date
GB312173A Expired GB1423311A (en) 1972-01-22 1973-01-22 Electronic proximity switching unit

Country Status (7)

Country Link
JP (1) JPS5416837B2 (en)
CH (1) CH564288A5 (en)
DE (1) DE2203038C3 (en)
FR (1) FR2169080B1 (en)
GB (1) GB1423311A (en)
IT (1) IT978329B (en)
SE (1) SE381543B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195441A (en) * 1986-09-02 1988-04-07 Ritchie Gordon S In-line proximity switch
US4803418A (en) * 1986-09-02 1989-02-07 Ritchie Gordon S In-line electrical switch for AC power supply

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552310C3 (en) * 1974-11-22 1988-02-11 Square D Co., Park Ridge, Ill. Electrical proximity switch
DE2515654B2 (en) * 1975-04-10 1979-10-18 Klaschka, Walter, Dr.-Ing., 7531 Tiefenbronn Proximity switch
JPS57188291A (en) * 1981-05-14 1982-11-19 Nippon Kentetsu Co Ltd Dehydration control system of washing machine
DE3321838A1 (en) * 1983-06-16 1984-12-20 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for a proximity switch with two connections
DE3722335A1 (en) * 1987-07-07 1989-01-19 Ifm Electronic Gmbh ELECTRONIC, PREFERABLY CONTACTLESS SWITCHGEAR
DE4111297C1 (en) * 1991-04-08 1992-06-17 Ifm Electronic Gmbh, 4300 Essen, De
DE4023529C3 (en) * 1990-06-11 1995-12-07 Ifm Electronic Gmbh Inductive, capacitive or optical proximity switch
DE4114763C1 (en) * 1991-05-06 1992-11-05 Ifm Electronic Gmbh, 4300 Essen, De
DE4023502A1 (en) * 1990-07-24 1992-02-06 Ifm Electronic Gmbh Electronic switch with e.g. opto-electronic proximity sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254236A (en) * 1963-11-29 1966-05-31 Gen Electric Voltage sharing circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195441A (en) * 1986-09-02 1988-04-07 Ritchie Gordon S In-line proximity switch
US4803418A (en) * 1986-09-02 1989-02-07 Ritchie Gordon S In-line electrical switch for AC power supply

Also Published As

Publication number Publication date
JPS504970A (en) 1975-01-20
JPS5416837B2 (en) 1979-06-25
DE2203038A1 (en) 1973-07-26
IT978329B (en) 1974-09-20
DE2203038B2 (en) 1975-03-06
FR2169080A1 (en) 1973-09-07
CH564288A5 (en) 1975-07-15
FR2169080B1 (en) 1976-08-27
DE2203038C3 (en) 1975-10-09
SE381543B (en) 1975-12-08

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19930120