EP1964264A1 - Détecteur de proximité capacitif - Google Patents

Détecteur de proximité capacitif

Info

Publication number
EP1964264A1
EP1964264A1 EP06829555A EP06829555A EP1964264A1 EP 1964264 A1 EP1964264 A1 EP 1964264A1 EP 06829555 A EP06829555 A EP 06829555A EP 06829555 A EP06829555 A EP 06829555A EP 1964264 A1 EP1964264 A1 EP 1964264A1
Authority
EP
European Patent Office
Prior art keywords
sensor
measuring
changes
receiver
drivers
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.)
Withdrawn
Application number
EP06829555A
Other languages
German (de)
English (en)
Inventor
Gerd Reime
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 EP1964264A1 publication Critical patent/EP1964264A1/fr
Withdrawn legal-status Critical Current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
    • H03K17/955—Proximity switches using a capacitive detector
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/94052—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated with evaluation of actuation pattern or sequence, e.g. tapping

Definitions

  • the invention relates to an arrangement for monitoring an object for changes in a field surrounding the object according to the preamble of claim 1.
  • the present invention seeks to make an arrangement for monitoring an object more sensitive and at the same time less susceptible to interference.
  • the arrangement operates capacitively, but inductive solutions can be realized in the same way.
  • the high-impedance coupling is preferably also provided with respect to the receiver in order to make the sensor-active region actually high-impedance. If necessary, an operating point optimization can be achieved in that the impedances provided between the low-resistance and the high-resistance region are selected so that the voltage in the region of the driver is greater than the voltage in the region of the sensor-active surface, preferably in the sensor-active region the voltage in the area of the driver is halved.
  • Hg. 1 is a block diagram of the arrangement
  • FIG. 6 a front view of an opening closed with the object
  • Fig. 7 is a plan view of the opening of FIG. 6 and
  • Fig. 8 shows an enlarged detail of Fig. 6 in the region of the articulation of the object on the door frame
  • ⁇ signed sensor means the whole door can as an object 10 made the active sensor part without a cable connection to the outer frame is required, and even without a sensor device is visible. It can also determine the direction of approach, for example, to open the door in the right direction.
  • the application of the arrangement is not limited to this embodiment. It can also be used when determining changes in the environment of other objects or also when changes in a moving or moving object result from the movement in its environment or when a moving object changes in its environment are to be detected in general.
  • the objects show an arrangement for monitoring an object 10 for changes in a field surrounding the object, wherein the object may be any object in whose surroundings changes are to be detected.
  • the object 10 is, for example, a glass door, which as a sensor-active surface 11 has on its two sides a coating as measuring surfaces 11a, 11b, which is intended, for example, to carry a capacitive charge.
  • the object, so here the door is so that all or the corresponding part sensor-active, in which in the case of the glass door, the coating is applied.
  • This coating can e.g. be arranged between two glass surfaces.
  • the field surrounding the object 10 is a capacitive field, although the arrangement may also work inductively in an analogous manner, provided that the desired high-impedance coupling with the impedance Z occurs.
  • the arrangement has at least one sensor-active region 11 associated with the object 10, which is formed in FIG. 1 by the two measuring surfaces 11a, 11b.
  • Each of the measuring sections is assigned at least one driver 12, 13 in order to apply a specific or determinable quantity in the sensor-active area. In the capacitive embodiment of Fig.
  • these drivers are digital / analog converters (DACs) which invert the signals coming from the outputs 17b, 17c of the regulator 17 once directly Q, once inverted Q in bring in the measuring sections.
  • the receiver 14 is for detecting the size applied by the drivers, which may be, for example, a certain amount of charge. However, the receiver also detects changes in the field surrounding the object 10 when, for example, a body approaches the sensor-active area 11 assigned to the object 10 and thereby changes the charge conditions.
  • a synchronous demodulator circuit Connected downstream of the receiver 14 is a synchronous demodulator circuit for determining changes to or in the field surrounding the object and for generating a control and / or measuring signal ⁇ 11a, ⁇ 11b.
  • the value for the power control of the drivers 12, 13 is at the same time the measurement signal, which is further evaluated. Since only when changing the field surrounding the object, e.g. Approaching a person or other object to amplify the possible difference from clock phase to clock phase, the amplifier, here the receive amplifier as a receiver 14, have a very high gain. This contributes significantly to the sensitivity of the measuring system.
  • At least one further measuring path with associated driver is provided in addition to the at least one measuring path.
  • the one measurement path may include the measurement surface 11a, while the other measurement path is associated with the measurement surface 11b.
  • the further measuring path is a reference path, then this is not influenced by external influences, but instead can be provided as a reference in a closed housing, for example. This would be equivalent to the fact that the glass door of Figures 3 to 8 only has a one-sided coating as a sensor-active area and thus evenly reacts to approach from both directions.
  • a clock circuit 15 is provided for the time-wise activation of each of the measuring sections or the at least one measuring section and the reference section.
  • the clock circuit 15 is driven, which is a signal to the switches 24, 25 via the output 15a and the measuring surfaces 11 a, 11 b alternately active. It goes without saying that more than two measuring surfaces can be provided and the clock circuit is then adapted accordingly.
  • the controller 20 controls from the output 20a via the control line 18, the driver 12, 13 and also via the input 21c to the analog / digital converter x bit ADC in synchronous demodulator 21 at.
  • the signals emanating from the output 12b, 13b of the drivers 12, 13 influence the predetermined or predeterminable magnitude, ie in the capacitive embodiment the charge of the measuring surfaces 11a, 11b.
  • the impedance Z is a series connection of 10 pF and 56 k ⁇ at a clock frequency of 100 kHz and a drive voltage of 2 volts.
  • the existing on the measuring surface preferably changing in the change of the clock fertil fertilizer then passes to the receiver 14, the receiving amplifier.
  • This gives its received signal as an amplified output signal to the synchronous demodulator 21, in which the respective measuring sections and / or reference lines associated signals and x bit ADC are compared with each other to form a differential signal, so that at the output 21b of the synchronous modulator 21, a signal the input 17a of the digital controller (eg with Pl characteristic) can be given as a control device 17.
  • the pending after the synchronous demodulator 21 signal is also given at the same time to the input 19a of the direction detector 19 with signal evaluation, which outputs from the outputs 19b, 19c, the changes to the measuring surfaces as a control and / or measurement signal .DELTA.11a, .DELTA.11b.
  • the value for the power control of the drivers 12, 13 coming from the outputs of the control device 17 and present at the inputs 12a, 12b of the drivers 12, 13 is at the same time the measurement signal which is further evaluated.
  • Control device 17 and direction detector 19 are connected via the terminals 17d, 19d and control line 30, if necessary, with each other.
  • the receiver 14 of each of the measuring sections has on average the same amplitude of the predetermined or predeterminable quantity, ie in the exemplary embodiment of the charge, from the drivers 12, 13 and the sensor-active region 11 Receiver 14 arrives. This is done by a corresponding readjustment of the driver power.
  • the sensor-active region 11 is coupled to the receiver 14 high impedance, which is represented by the impedance Z.
  • the high-impedance coupling with respect to the drivers 12, 13 and the receiver 14 is formed approximately the same size, which happens in the embodiment by the same size capacitors, resistors, coils or combinations of said components.
  • the ratio of the voltage at the drivers 12, 13 to the voltage in the sensor-active region 11 is selected such that this value is less than 1, a workspace optimization according to FIG. 2 can take place.
  • the ordinate shows the voltage U 11a at the one measuring path of the impedance Z. It becomes clear that the slope of this curve at maximum voltage U_max and minimum voltage U_min at the measuring surface is low, while it is greater in the middle range. If values are to be derived from voltage changes, it is therefore recommended that the ratio of the voltage across the drivers 12, 13 to the voltage in the sensor-active region 11 be kept between 0.1 and 0.9, preferably even approximately 0.5. In this area, an amplitude change leads to the strongest signal change.
  • the capacitors Due to the small capacitance or the high resistance or the high induction - in the embodiment - of the capacitors results in the desired high impedance from the measuring surface 11a, 11b to the output stage and from the measuring surface to the preamplifier. Such smallest changes take place even when the approaching person is not on a grounded ground. Even a metallically conductive connection in the immediate vicinity of the measuring surface does not disturb the sensitivity of the system. Due to the preamplification or the high control performance even the smallest changes to the measuring surface can be detected perfectly.
  • the object is a door, for example, a glass door, which should open automatically when approaching a person.
  • coatings can be arranged on the glass door to form a capacitance, as by the measuring surfaces 11a, 11b in the figures 3 and 4 indicated. If one wants to capacitively couple these measuring surfaces according to FIGS. 7 and 8 over the door frame, only small surfaces are available on the door stop in the region of the door frame 22, so that only small capacitors are suitable for this purpose, and in particular no cables. Although this allows a supply line 23 on Mosrah- men 22 to the capacitor, the surface itself is small, but at the same time allows the desired high-impedance coupling.
  • different areas of the door can be coupled via various superimposed areas or adjacent areas of the door frame.
  • One of the capacitive couplings corresponds to the impedance Z between the drivers 12 or 13 to the measuring surface 11a, 11b, while the other capacitive coupling (s) corresponds to the impedance Z to the preamplifier.
  • only a capacitive measuring path is thus shown without direction detection.
  • each surface can be integrated into its own measuring path. This thus permits a direction-dependent detection of a person or an object approaching the door or the object 10. Conversely, when such an object moves, a sensor signal also results, even when approaching a dry wooden pole, which thus carries hardly any charge.
  • the measuring surfaces 11a, 11b do not have to be formed as flat surfaces as in FIGS. 3 to 8.
  • the surfaces can assume any desired shape without losing the advantages of the solution according to the invention. This creates a great deal of creative freedom, which is advantageous for any desired application, in particular in the approximation detection and direction detection.
  • a conductor wire can be arranged along an eg movable rubber strip in order, for example, to realize a trapping protection on a movable element.
  • This measuring arrangement can be used, for example, on a vehicle on the window, door or tailgate or on a sliding or revolving door, since the measuring arrangement described almost does not change its sensitivity even in the immediate vicinity of metal frames.
  • a person or object in the vicinity, for example at a distance of 50 cm, is recognized due to the capacitive effect, while, for example, a dry wooden lath deforms the rubber strip upon contact, whereupon the change in distance between the conductor wire and the metal surface causes the measuring arrangement to respond.
  • the electrical ground of the sensor device is then connected to the electrically conductive mass of the metal frame.
  • It can but also two lines so in a flexible element, for example, the rubber strip are arranged, they change each other slightly when exposed to an external force.
  • the two lines can then be one of the sensor-active area 11 with the measuring surface and the other the electrical mass of the sensor. But even here a direction-dependent detection is possible if the two lines are operated as measuring surfaces 11a, 11b.
  • the signals of the clock circuit 15 can have any desired pulse shape. In this case, this shape is not limited to a rectangular signal, but the clock signal may also be sinusoidal, if this is advantageous for certain purposes.
  • the drivers can be operated by means of a Sp Gillbandspektrums, thereby avoiding a resonance with frequencies present in the environment as far as possible.
  • the methods used in this case such as TDMA, CDMA, FDMA, etc. known.

Abstract

L'invention concerne un arrangement qui sert à surveiller un objet tel qu’une porte pour détecter les modifications dans un champ qui entoure l'objet. Une zone de détection active comprenant une surface de mesure (11a) est associée à l’objet et un circuit d’attaque (12, 13) introduit une grandeur donnée dans la zone de détection active. Un récepteur (14) détecte la grandeur introduite par les circuits d’attaque et les modifications de la grandeur dans le champ qui entoure l’objet (10) dans la zone de détection active (11). Un circuit branché à la suite du récepteur (14) permet d’utiliser les modifications dans le champ entourant l’objet (10) pour générer un signal de commande et/ou de mesure (Δ11 a, Δ11 b). Du fait qu’il soit prévu en plus un trajet de mesure supplémentaire ou un trajet de référence avec des circuits d'attaque (13, 12) associés pour détecter les modifications de la grandeur dans le champ entourant l’objet (10), qu’il soit prévu un circuit d’horloge (15) pour l’activation périodique de chacun des trajets de mesure ou du trajet de mesure et du trajet de référence, qu’il soit prévu un dispositif de régulation (17) pour réguler ladite ou lesdites grandeurs introduites par les circuits d’attaque (12,13) dans les trajets de mesure et/ou le trajet de référence en tant que réponse aux modifications de la grandeur dans le champ de sorte que le récepteur (14) reçoive depuis chacun des trajets de mesure en moyenne la même amplitude de la grandeur de la part des circuits d’attaque et de la zone de détection active (11) et que la zone de détection active (11) soit connectée au moins à haute impédance aux circuits d’attaque (12, 13), un arrangement de surveillance d’un objet devient plus sensible et en même temps insensible aux perturbations.
EP06829555A 2005-12-14 2006-12-12 Détecteur de proximité capacitif Withdrawn EP1964264A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005063023A DE102005063023A1 (de) 2005-12-14 2005-12-14 Anordnung zur Überwachung eines Objekts
PCT/EP2006/011978 WO2007068457A1 (fr) 2005-12-14 2006-12-12 Détecteur de proximité capacitif

Publications (1)

Publication Number Publication Date
EP1964264A1 true EP1964264A1 (fr) 2008-09-03

Family

ID=37836717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06829555A Withdrawn EP1964264A1 (fr) 2005-12-14 2006-12-12 Détecteur de proximité capacitif

Country Status (4)

Country Link
US (1) US7902841B2 (fr)
EP (1) EP1964264A1 (fr)
DE (1) DE102005063023A1 (fr)
WO (1) WO2007068457A1 (fr)

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DE202007008439U1 (de) * 2007-06-16 2008-10-23 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Auswerteschaltung für eine Messkapazität
DE102007033886B4 (de) * 2007-07-20 2009-04-30 Siemens Ag Ausgabeeinheit zum Ausgeben von unterschiedlichen Signalen; elektrisches Bauelement zur Steuerung eines elektrischen Gerätes sowie Verfahren zum Ausgeben von unterschiedlichen Signalen durch eine Ausgabeeinheit
DE102008003186A1 (de) * 2007-10-05 2009-04-16 Marantec Antriebs- Und Steuerungstechnik Gmbh & Co. Kg Verfahren und System zur Steuerung eines Torantriebes
DE102007048402A1 (de) * 2007-10-09 2009-04-16 Gerd Reime Bedieneinheit und Verfahren zur Auslösung einer Funktion
JP4941938B2 (ja) * 2007-10-10 2012-05-30 三菱自動車工業株式会社 容量変化検出回路、タッチパネル及び判定方法
DE102008018671B4 (de) * 2008-04-14 2023-07-06 Volkswagen Ag Berührungsdetektionseinrichtung für ein Kraftfahrzeug
DE102009057931B4 (de) * 2009-12-11 2015-07-09 Ident Technology Ag Schaltungsanordnung für ein kapazitives Sensorelement.
JP5624534B2 (ja) * 2011-12-20 2014-11-12 Ｗｐｃコーポレーション株式会社 木質合成粉
DE102012104750A1 (de) * 2012-06-01 2013-12-05 Ingo Reusch Vorrichtung zum berührungsfreien Öffnen von Türen
DE102012217086B3 (de) * 2012-09-21 2014-03-20 Mayser Gmbh & Co. Kg Kapazitiver Sensor und Tür- oder Klappenanordnung mit einem kapazitivem Sensor
US9638654B2 (en) 2013-11-25 2017-05-02 Oil States Industries, Inc. Method and system for health monitoring of composite elastomeric flexible elements

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Also Published As

Publication number Publication date
US7902841B2 (en) 2011-03-08
DE102005063023A1 (de) 2007-06-21
WO2007068457A1 (fr) 2007-06-21
US20080303537A1 (en) 2008-12-11

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