WO2009010346A1 - Agencement de circuit avec une bobine reliée à un oscillateur et procédé d'exploitation d'un tel agencement de circuit - Google Patents

Agencement de circuit avec une bobine reliée à un oscillateur et procédé d'exploitation d'un tel agencement de circuit Download PDF

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Publication number
WO2009010346A1
WO2009010346A1 PCT/EP2008/057392 EP2008057392W WO2009010346A1 WO 2009010346 A1 WO2009010346 A1 WO 2009010346A1 EP 2008057392 W EP2008057392 W EP 2008057392W WO 2009010346 A1 WO2009010346 A1 WO 2009010346A1
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WO
WIPO (PCT)
Prior art keywords
oscillator
coil
circuit arrangement
circuit
inductive interaction
Prior art date
Application number
PCT/EP2008/057392
Other languages
German (de)
English (en)
Inventor
Lutz-Helge Radwan
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2009010346A1 publication Critical patent/WO2009010346A1/fr

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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
    • H03K17/953—Proximity switches using a magnetic detector using inductive coils forming part of an oscillator
    • H03K17/9535—Proximity switches using a magnetic detector using inductive coils forming part of an oscillator with variable 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
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9502—Measures for increasing reliability
    • 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
    • H03K17/9525—Proximity switches using a magnetic detector using inductive coils controlled by an oscillatory signal
    • 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

Definitions

  • Circuit arrangement with a coil connected to an oscillator and method for operating such a circuit arrangement
  • the invention relates to a circuit arrangement with a coil connected to an oscillator and a monitoring circuit which is sensitive to an inductive interaction of the coil with an electrically conductive object.
  • a corresponding circuit arrangement is known from the article "The Radsensorsystem RS S as Switzerlandin Eckstician", G. Hoffmann , H. Sander, Signal + Wire 78 (1986), pages 264-268.
  • This article is a circuit arrangement for a described wheel sensor in rail-bound traffic, which is fastened to a rail and responsive to wheel flanges RAE ⁇ countries of rail vehicles.
  • the coil which is part of the resonant circuit of the oscillator is acted upon by the oscillator with an AC voltage.
  • the known circuit arrangement therefore realizes a wheel sensor according to the principle of the inductive proximity switch.
  • Corresponding disturbance variables may be, for example, high-frequency fields or field components that cause undesired energy in induce the coil. This can lead to erroneous measurements, which can lead to corresponding disruptions of the process, for example, when using a corresponding scarf ⁇ tion arrangement in the field of railway safety technology.
  • the present invention has for its object to provide a circuit arrangement of the type mentioned, which is particularly insensitive to electromagnetic interference.
  • This object is achieved according to the invention for a circuit arrangement with a coil connected to an oscillator and a monitoring circuit which is sensitive to an inductive interaction of the coil with an electrically conductive object, that the circuit arrangement for changing the power supplied to the coil from the oscillator is, if detected by the monitoring circuit a threshold exceeding inductive interaction ⁇ effect.
  • the circuit arrangement according to the invention is preferred since it is designed in such a way that when a inductive interaction exceeding a threshold value is detected by the monitoring circuit, the power supplied to the coil by the oscillator is changed.
  • two different states are preferably distinguished by means of the circuit arrangement.
  • a first state may be given by the fact that no electrically conductive object is in the range of action of the magnetic field of the coil and thus no inductive interaction takes place.
  • a second state in which an e- is lectric conductive object in the field of the magnetic field of the coil, on the basis of the threshold value over-writing ⁇ Tenden inductive interaction are detected.
  • the change of the coil from the Os ⁇ zillator power supplied provided that a threshold border inductive interaction is detected by the monitoring circuit, in either an increasing or a decreasing of the coil consist supplied power.
  • the circuit arrangement ge ⁇ genüber electromagnetic disturbances is particularly insensitive in the state in which the higher power is supplied. The reason is that the Leis ⁇ processing of the interference signal must be correspondingly higher in this case to cause a disturbing effect.
  • the circuit arrangement is designed to increase the power supplied to the coil by the oscillator, if an inductive interaction exceeding the threshold value is detected by the monitoring circuit, the immunity of the circuit arrangement is in the state which is exceeded by the threshold value exceeding the threshold value. Ductile interaction is defined increases. This is before ⁇ geous, since in many cases with the occurrence of disturbances in particular in the passage of the electrically conductive article is expected. Due to the higher power supplied thus disturbances that are caused for example in the field of railway safety technology by passing vehicles, less noticeable ⁇ be noticeable, thereby increasing the availability of the circuit arrangement according to the invention.
  • the circuit arrangement is designed to reduce the power supplied to the coil by the oscillator, if an inductive interaction exceeding the threshold is detected by the monitoring circuit, the immunity of the circuit arrangement is increased in the absence of an electrically conductive object , This offers advantages in particular for those applications in which the corresponding state exists in the clear majority of the time.
  • the invention is designed such that the coil is part of the resonant circuit of the oscillator.
  • the coil is part of the resonant circuit of the oscillator.
  • advantageously can be dispensed with ei ⁇ ne another coil for the resonant circuit.
  • the monitoring circuit is an inductive interaction in the form of a change in the inductance of the coil, a change in the oscillation amplitude of the resonant circuit of the oscillator, a change in the quality of the resonant circuit of the oscillator and / or a change in the damping the resonant circuit of the oscillator emp ⁇ sensitive.
  • the change in the quality of the resonant circuit has a high sensitivity with respect to an inductive interaction of the magnetic field of the coil with an electrically conductive, ie in particular metallic, object.
  • the change in the quality of the resonant circuit is caused by induced in accordance with the law of induction in the electrically conductive object eddy currents, which withdraw energy from the resonant circuit, where ⁇ reduces the oscillation amplitude.
  • an inductive interaction can also be detected on the basis of a change in the damping of the resonant circuit, ie at the reciprocal of the quality of the resonant circuit, and / or based on a change in the inductance of the coil.
  • the circuit arrangement according to the invention is designed such that the circuit arrangement has an electrical interface for outputting a characteristic of the size of the inductive interaction signal.
  • a characteristic for the size of the respective inductive interaction signal may be transmitted, for example to a downstream processing or control device.
  • the Information Availability checked ⁇ supply thereby is made whether a Befahrung by a wheel or a wheel flange is present or not.
  • the characteristic In this case, the teristic signal has one of two possible values, so that information can be output directly via the electrical interface as to whether an inductive interaction lying above the threshold is present or not.
  • the circuit arrangement according to the invention can advantageously also be designed such that the electrical interface is a current loop and the circuit arrangement is designed such that a change in the power supplied to the coil by the oscillator causes a change in a current flowing in the current loop.
  • the electrical interface is a current loop
  • the circuit arrangement is designed such that a change in the power supplied to the coil by the oscillator causes a change in a current flowing in the current loop.
  • the circuit arrangement according to the invention can also be designed in such a way that, when the inductive interaction exceeds the threshold value, the power supplied to the coil by the oscillator is changed by a change in an operating parameter of the oscillator.
  • a corresponding operating parameter may, for example, be the operating point of the oscillator.
  • the inventive circuit arrangement de ⁇ pronounced rart that the oscillator is connected to a source of operating voltage and the operating voltage source of the monitoring circuit is controllable such that there is a change of the operating voltage provided by the operating voltage source at the threshold border inductive interaction.
  • the circuit arrangement according to the invention is so pronounced that the circuit arrangement for returning the power supplied to the coil by the oscillator is designed to the original value, provided that the monitoring circuit detects an inductive interaction which falls below a further threshold value.
  • the circuit arrangement offers the advantage that in the event that the electrically conductive object has left the effective range of the coil, ie, the inductive interaction approaches its original value again, the power supplied to the coil from the oscillator is returned to the original value or switched back can.
  • the size of the further threshold value can be identical to the size of the threshold value or else greater or smaller than the threshold value, depending on the particular circumstances.
  • the circuit arrangement according to the invention is part of an inductive proximity switch. This is advantageous because corresponding inductive proximity switches are used in a variety of technical fields, such as automation technology or railway signaling technology, for detecting electrically conductive objects.
  • the circuit arrangement according to the invention can also be so pronounced that it is part of a wheel ⁇ sensor.
  • This development of the sensor device according to the invention is preferred, since in particular wheel sensors a high immunity to interference from electromagnetic disturbances is required.
  • the present invention further relates to a method for operating a circuit arrangement having a coil connected to an oscillator, in which an inductive interaction ⁇ effect of the coil is detected with an electrically conductive object.
  • the method of the present invention has the object to provide a method of the aforementioned type, which is particularly immune to interference from electromagnetic interference.
  • the inventive method is preferred because the basis of the power supplied to the coil allows an Un ⁇ terscheidung different states or switching states. At the same time, advantageously, the Störfes ⁇ ACTION is increased in the one of the switching states in which the coil, the more power is supplied.
  • the power supplied to the coil power is increased upon detection of a threshold border inductive interaction, there is the advantage that in this way the Störfes ⁇ ACTION the circuit arrangement is increased in the respective state.
  • the power supplied to the coil is reduced upon detection of a threshold crossing inductive interaction.
  • This embodiment of the method according to the invention is particularly advantageous in those cases in which, in the event that no electrically conductive object is in the range of the magnetic field of the coil of the circuit ⁇ arrangement, a particularly high immunity ge ⁇ desires. It is assumed here that an approach be ⁇ relationship as moving past a first not located in the region of the magnetic field of the coil metal Jacobs ⁇ tands to be recognized. However, unless the monitor to the removal of an object from the area of the magnetic field of the coil ⁇ aims, the foregoing Ausfact ⁇ gen are to be transmitted according to this application.
  • the inventive method can also be configured such that a coil of the Schwingkrei ⁇ ses of the oscillator is used as a coil.
  • a coil for inductive interactions of the loading relationship as the magnetic field of the coil with an electrically conductive object particularly sensitive Heidelbergungsan ⁇ order is achieved.
  • an additional coil is advantageously avoided as part of the resonant circuit of the oscillator.
  • an inductive interaction is detected on the basis of a change in the inductance of the coil, the oscillation amplitude of the resonant circuit of the oscillator, the quality of the oscillating circuit of the oscillator and / or the damping of the resonant circuit of the oscillator.
  • the measured variables mentioned are sawn especially well suited for a reliable detection of the inductive interaction.
  • a characteristic of the size of the inductive interaction signal facilitates ⁇ ben.
  • the signal characteristic of the size of the inductive interaction information about whether an electrically conductive object is in the region of the coil or of the magnetic field of the coil can advantageously be output to a further component.
  • the signal can either represent the respective size of the induct ⁇ tive interaction or, depending on the undershooting or exceeding the threshold, one or the other value.
  • an electrical interface in the form of a current loop causes a change in the current flowing in the current loop by changing the power supplied to the coil by the oscillator.
  • the inventive method can also proceed so that the coil of the oscillator power supplied is changed by a change of a Radiome ⁇ ters of the oscillator at the threshold border inductive interaction.
  • This offers the advantage that the coil supplied by the oscillator performance in a comparatively simple and additional components vermei ⁇ Dende way can be changed.
  • the inventive method is such being impressed ⁇ that the operating voltage source is controlled by the monitoring circuit in such a way in a ver ⁇ ensured by an operating voltage source oscillator that is a change in the operating voltage provided by the operating voltage source at the threshold border inductive interaction.
  • This is advantageous because Oszillato ⁇ ren are usually fed by a corresponding operating voltage ⁇ source to a DC voltage.
  • a Change ⁇ tion of the loading provided by the operating voltage source operating voltage leads advantageously directly to a change of the power provided by the oscillator.
  • the coil of the Os ⁇ zillator supplied power to the original value is returned if a threshold value under another border inductive Wech ⁇ selrial is detected by the monitoring circuit.
  • FIG. 1 shows a circuit diagram of an embodiment of the circuit arrangement according to the invention with a coil connected to an oscillator
  • FIG. 2 shows an exemplary embodiment of the temporal occurring during operation of the exemplary embodiment of the inventive circuit arrangement according to FIG.
  • Figure 4 shows an embodiment of the occurring during operation of the exemplary embodiment of the inventive circuit arrangement according to Figure 1 ⁇ time course of a rectified voltage
  • FIG. 5 shows an exemplary example of which occur during operation of the exemplary embodiment of the inventive circuit arrangement according to Figure 1 ⁇ time course of a loop current of an electrical interface in the form of a current loop.
  • Figure 1 shows a circuit diagram of an embodiment of the circuit arrangement according to the invention with a connected to an oscillator G coil L.
  • the coil L is arranged in the resonant circuit of the oscillator.
  • circuit arrangement shown in FIG. 1 is part of a wheel sensor of railway signaling technology.
  • a corresponding wheel sensor is used to detect a drive through a wheel or a flange of a wheel and to transmit a corresponding Befahrungssignal to an evaluation or Steuerein ⁇ direction.
  • the oscillator G is fed by an operating voltage source BSP with an operating voltage U B.
  • a demodulator DM On the output side of the oscillator G is connected to a demodulator DM, which wins from the amplitude of the AC voltage of the oscillator G, a directional voltage U RS .
  • the direct voltage U RS is supplied to a signal evaluation SB, which is advantageously also arranged as a direct component of the wheel sensor on the track.
  • the signal evaluation SB fulfilled together with the demodulator DM, the function of a monitoring circuit and is used to detect a screaming over a threshold ⁇ Tenden inductive interaction.
  • an electrical interface SS is shown a flow ⁇ loop in shape, of which the illustrated circuit arrangement to the downstream, in the Figure 1 for reasons of clarity not shown evaluation or control ⁇ device is connected.
  • the signal evaluation SB it is decided on the basis of a predefinable or predefined threshold value whether an inductive interaction, ie the undamped or the damped state, is present.
  • ⁇ riding supplied operating voltage U B of the oscillator G is then switched between a first value and a second value Ui U. 2
  • the oscillator G is constructed such that an increase ⁇ ing the operating voltage U B simultaneously causes an increase in its current consumption, thereby further increasing the loop current I s of the electrical interface SS is effected in the form of the current loop.
  • the circuit arrangement for reducing the power supplied to the coil L from the oscillator G may be formed, provided that the monitoring circuit DM, SB an inductive interaction exceeding the threshold is he ⁇ known.
  • a corresponding inductive interaction leads in the embodiment of Figure 1, in which the coil L is part of the resonant circuit of the oscillator G, to ei ⁇ ner corresponding damping of the resonant circuit.
  • the circuit arrangement is designed to increase the power supplied to the coil L by the oscillator G, provided that the signal evaluation SB of the monitoring circuit DM, SB is the one
  • Threshold exceeding inductive interaction he ⁇ known is. It should be Emphasizing executed reported ⁇ that the signal evaluation SB is usually not directly a measure of the inductive interaction, such as monitoring the quality of the resonant circuit of the oscillator G, but a size such as the directional ⁇ voltage U Rs derived from this inductive interaction. So far as now the power supplied to the coil L of the Oszilla ⁇ tor G when detecting a damping of the Coil L is increased, then a high loop current I s of the electrical interface SS corresponds to the damped state. This offers the advantage that in the damped state, the oscillation amplitude of the oscillator G and thus also the noise immunity is increased.
  • the threshold values used are to be predefined taking into account the power supplied in the respective state. This means that the respective threshold values are to be switched in accordance with the change in the oscillator amplitude in order to avoid an uncontrolled switching back and forth between the two states.
  • the time response is advantageously adapted to the up and Abschwing of the oscillator G.
  • FIG. 2 shows an exemplary embodiment of the time profile of the damping D of the resonant circuit occurring during operation of the exemplary embodiment of the inventive circuit arrangement according to FIG. Shown is the attenuation D as a function of the time t during a passing movement, ie at an approach and subsequent removal, of an electrically conductive object to be detected.
  • these are the Prior ⁇ crizchi a rim of a wheel of a rail car tool on a wheel sensor having a circuit arrangement according to the embodiment of Figure 1.
  • Figure 3 shows an embodiment of the voltage during the operation of the embodiment of Heidelbergungsanord- invention occurring according to Figure 1 time profile of an oscillation vibration OS, ie the vibration behavior of the oscillator G.
  • an oscillation vibration OS ie the vibration behavior of the oscillator G.
  • FIG. 4 shows an exemplary embodiment of the time profile of a directional voltage U RS occurring during operation of the exemplary embodiment of the inventive circuit arrangement according to FIG.
  • the oscillator amplitude OS at time t.sub.i has fallen so far due to the external damping by the wheel rim of the rail vehicle that the threshold value, ie the response threshold, for the directional voltage U RS in the signal evaluation SB is reached. This means that the detection of the inductive threshold exceeds the threshold
  • Interaction in the described embodiment is carried out by the signal evaluation SB on the basis of the direct voltage U RS , which is a measured variable or a representative of the inductive interaction.
  • the rectified voltage U RS in the embodiment shown on the Hüllkur ⁇ ve the negative half-waves of the oscillation amplitude OS be ⁇ is true, so that a decrease of the amount of OS oscillator amplitude causes an increase in the rectified voltage U RS.
  • the signal evaluation SB now switches an operating parameter of the operating voltage source BSP such that the Oszilla ⁇ gate G less power is supplied.
  • this has a direct reduction in the loop current I 5 of the electrical interface SS in the form the current loop.
  • the sudden drop in the Oszillatoramp ⁇ litude OS is effected at the time ti that is clearly visible in FIG. 3
  • FIG. 5 shows an exemplary embodiment of the time profile of a loop current I 3 of an electrical interface SS in the form of a current loop occurring during operation of the exemplary embodiment of the inventive circuit arrangement according to FIG.
  • the corresponding decrease of the loop current I s is reached before ⁇ geous enough, characterized in that the oscillator G Weni ⁇ ger power is supplied.
  • the thresholds for detection and non-detection of the electrically conductive object to be selected must be adapted to the above-described changes in the oscillator amplitude OS. This can be seen in the Signalver ⁇ run of Figure 4, since without switching the oscillator amplitude OS, the thresholds "off” and “on” would be reversed taking into account a hysteresis in this example in their position.
  • the external damping of the oscillator Schwingkrei ⁇ ses G with the coil L is dropped so Au ground the corresponding inductive interaction of the rim with the magnetic field of the coil, that it at a distance of the object to be detected, ie the rim, closed can be.
  • the signal evaluation SB therefore switches due to a corresponding change in the directional voltage U RS the relevant operating parameter of the oscillator
  • the above-described embodiment of the circuit arrangement according to the invention has the advantage that the power supply of the oscillator G is not kept constant, but is adapted to the depending on the switching state of the output ⁇ interface in the form of the electrical interface SS maximum available power.
  • This is advantageous in particular in the case of electrical interfaces SS in the form of current loops, since in this case the available power is limited by the electrical values of this interface, which results in practice in particular for circuit arrangements with such interfaces a certain sensitivity to electromagnetic interference.
  • the oscillator G is advantageously operated at each ⁇ time with the maximum available power, and thus the maximum amplitude.

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  • Electronic Switches (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

L'invention concerne un agencement de circuit avec une bobine (L) attachée à un oscillateur (G) ainsi qu'un circuit de surveillance (DM, SB) qui est sensible à une interaction inductive de la bobine (L) avec un objet électriquement conducteur, l'agencement de circuit proposé par l'invention étant réalisé pour modifier la puissance apportée à la bobine (L) par l'oscillateur (G), à condition qu'une interaction inductive dépassant une valeur de seuil soit reconnue par le circuit de surveillance (DM, SB). L'invention concerne en outre un procédé de fonctionnement d'un agencement de circuit avec une bobine (L) reliée à un oscillateur (G).
PCT/EP2008/057392 2007-07-19 2008-06-12 Agencement de circuit avec une bobine reliée à un oscillateur et procédé d'exploitation d'un tel agencement de circuit WO2009010346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710034270 DE102007034270A1 (de) 2007-07-19 2007-07-19 Schaltungsanordnung mit einer mit einem Oszillator verbundenen Spule sowie Verfahren zum Betreiben einer solchen Schaltungsanordnung
DE102007034270.7 2007-07-19

Publications (1)

Publication Number Publication Date
WO2009010346A1 true WO2009010346A1 (fr) 2009-01-22

Family

ID=39745569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/057392 WO2009010346A1 (fr) 2007-07-19 2008-06-12 Agencement de circuit avec une bobine reliée à un oscillateur et procédé d'exploitation d'un tel agencement de circuit

Country Status (3)

Country Link
DE (1) DE102007034270A1 (fr)
TW (1) TW200913478A (fr)
WO (1) WO2009010346A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368049A1 (fr) * 1976-10-15 1978-05-12 Itt Produits Ind Detecteur de proximite
GB2075201A (en) * 1980-05-02 1981-11-11 Honeywell Gmbh Electronic proximity switch
EP0078511A2 (fr) * 1981-10-30 1983-05-11 Fuji Electric Co. Ltd. Commutateur électronique de proximité
EP0227966A1 (fr) * 1985-12-12 1987-07-08 Siemens Aktiengesellschaft Commutateur de proximité inductif
WO1999010981A1 (fr) * 1997-08-22 1999-03-04 Detra Sa Capteur de proximite inductif a circuit oscillant a reaction inductive

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332801A1 (de) * 1993-09-27 1995-03-30 Turck Werner Kg Induktiver Näherungsschalter
DE19514494A1 (de) * 1995-04-19 1996-10-24 Soyck Gmbh Induktiver Näherungsschalter
DE10143900A1 (de) * 2001-09-07 2003-03-27 Sick Ag Induktiver Näherungssensor
US7675285B2 (en) * 2004-09-09 2010-03-09 Rockwell Automation Technologies, Inc. Sensor and method including noise compensation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368049A1 (fr) * 1976-10-15 1978-05-12 Itt Produits Ind Detecteur de proximite
GB2075201A (en) * 1980-05-02 1981-11-11 Honeywell Gmbh Electronic proximity switch
EP0078511A2 (fr) * 1981-10-30 1983-05-11 Fuji Electric Co. Ltd. Commutateur électronique de proximité
EP0227966A1 (fr) * 1985-12-12 1987-07-08 Siemens Aktiengesellschaft Commutateur de proximité inductif
WO1999010981A1 (fr) * 1997-08-22 1999-03-04 Detra Sa Capteur de proximite inductif a circuit oscillant a reaction inductive

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Publication number Publication date
TW200913478A (en) 2009-03-16
DE102007034270A1 (de) 2009-01-22

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