WO2017167645A1 - Procédé pour reconnaître un effleurement d'un élément sensible capacitif - Google Patents

Procédé pour reconnaître un effleurement d'un élément sensible capacitif Download PDF

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Publication number
WO2017167645A1
WO2017167645A1 PCT/EP2017/056993 EP2017056993W WO2017167645A1 WO 2017167645 A1 WO2017167645 A1 WO 2017167645A1 EP 2017056993 W EP2017056993 W EP 2017056993W WO 2017167645 A1 WO2017167645 A1 WO 2017167645A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor element
detecting
pass filter
output signal
touch
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.)
Ceased
Application number
PCT/EP2017/056993
Other languages
German (de)
English (en)
Inventor
Marco Dahlhaus
Jan Freiwald
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.)
Leopold Kostal GmbH and Co KG
Original Assignee
Leopold Kostal GmbH and Co KG
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 Leopold Kostal GmbH and Co KG filed Critical Leopold Kostal GmbH and Co KG
Publication of WO2017167645A1 publication Critical patent/WO2017167645A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • 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
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/96071—Capacitive touch switches characterised by the detection principle
    • H03K2217/960725—Charge-transfer

Definitions

  • the invention relates to a method for detecting a contact of a capacitive sensor element, wherein a capacitance value of the sensor element is measured by means of a continuously applied integration method, wherein in each case a voltage applied to an integration capacitor having a known capacitance value measured by means of an A / D converter and to a Raw sensor value is processed, which
  • Raw sensor values are evaluated for detecting a touch of the sensor element.
  • Such a sensor may detect the presence and, when appropriately configured, the location of a touch or approach by an object, such as a user's finger or a stylus, within a sensitive area.
  • the touch-sensitive area can, for example, overlay a display screen.
  • the proximity sensor may allow the user to interact directly with what is displayed on the screen rather than indirectly via a mouse or similar input device.
  • touch sensors such as resistive touch sensors, surface acoustic wave touch sensors, and capacitive touch sensors, the latter of which, in particular, may be detected as a mere approximation, have become the most popular.
  • capacitive touch sensors When an object touches or comes in contact with the surface of a capacitive touch sensor, a change in the capacitance value of the sensor element occurs.
  • the task of an associated sensor control unit or of the measuring method used by it is this
  • Capacitance change process to capture the triggering touch or approach is that the capacitance values of the sensor elements and in particular the changes to be detected are very small. For this reason, they are often used for their measurement so-called integration method in which small amounts of charge from the sensor element whose capacitance value is relatively small and variable, are transferred to an integration capacitor with a known fixed and significantly larger capacitance value in several successive cycles.
  • German patent application DE 10 2010 041 464 A1 is a
  • a method for detecting a contact of a capacitive sensor element according to the preamble of claim 1 has become known.
  • the changes to be recorded are very small, also has the consequence that the measurement is very prone to failure.
  • erroneous detection of a supposed touch of the sensor element is possible in particular by the irradiation of high-frequency electromagnetic interference signals, although such has not occurred.
  • the method according to the present invention has the advantage over the previously described, with the same high sensitivity with respect to the detection of actual touches of the sensor element triggered in particular by high-frequency electromagnetic interference signals
  • Raw sensor values are fed to a high-pass filter, and that the output signal of the high-pass filter is evaluated to detect interference by high-frequency electromagnetic radiation.
  • the suppression of false detections is preferably carried out in that the output signal of the high-pass filter with a fixed
  • Limit is compared, and when exceeded the limit value by the output signal supposedly detected touches are marked as invalid.
  • the single figure shows the application of a high-pass filter for detecting high-frequency electromagnetic radiation in the evaluation of the raw sensor values of a touch-sensitive sensor element as a flowchart.
  • step 1 raw sensor values of a touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive touch-sensitive
  • the high-pass filter 3 is used for Detection of interference from high-frequency electromagnetic
  • Touch recognition 2 has three different possible output values. If the currently detected raw sensor value is between a lower limit and an upper limit, the output signal "None
  • the high pass filter 3 has two different possible output values. When the output signal of the high-pass filter 3 is below an upper limit value, the output signal "No disturbance” KS is outputted When the output signal of the high-pass filter 3 is above this upper limit value, the output signal "Fault Detected” SE is output. A touch is only recognized as valid and output in method step BA if the output signal of the touch detection 2 is "touch detected” BE, and at the same time the high-pass filter 3 outputs "no fault” KS. When the touch detection 2 outputs the output signal "Fault Detected” SE, and at the same time the high-pass filter 3 outputs "No Interference” KS the system stopped. There is probably a hardware error in which further operation of the touch detection is not possible.

Landscapes

  • Electronic Switches (AREA)

Abstract

L'invention concerne un procédé pour reconnaître un effleurement d'un élément sensible capacitif, procédé selon lequel une valeur de capacité de l'élément sensible est mesurée au moyen d'un procédé d'intégration appliqué d'une façon continue, une tension appliquée à un condensateur d'intégration avec une valeur de capacité connue étant mesurée au moyen d'un convertisseur analogique-numérique et transformée en une valeur brute de capteur, les valeurs brutes de capteur étant évaluées afin de reconnaître un effleurement de l'élément sensible. Selon l'invention, le procédé est caractérisé en ce que les valeurs brutes de capteur, acquises de façon continue, sont envoyées à un filtre passe-haut, et le signal de sortie du filtre passe-haut est évalué afin de détecter des perturbations dues au rayonnement électromagnétique à haute fréquence.
PCT/EP2017/056993 2016-03-26 2017-03-23 Procédé pour reconnaître un effleurement d'un élément sensible capacitif Ceased WO2017167645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016003779.2A DE102016003779A1 (de) 2016-03-26 2016-03-26 Verfahren zum Erkennen einer Berührung eines kapazitiven Sensorelements
DE102016003779 2016-03-26

Publications (1)

Publication Number Publication Date
WO2017167645A1 true WO2017167645A1 (fr) 2017-10-05

Family

ID=58410334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/056993 Ceased WO2017167645A1 (fr) 2016-03-26 2017-03-23 Procédé pour reconnaître un effleurement d'un élément sensible capacitif

Country Status (2)

Country Link
DE (1) DE102016003779A1 (fr)
WO (1) WO2017167645A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7031886B1 (en) * 2004-12-14 2006-04-18 Synaptics Incorporated Methods and systems for detecting noise in a position sensor using minor shifts in sensing frequency
WO2009070814A2 (fr) * 2007-11-27 2009-06-04 Frederick Johannes Bruwer Élimination du bruit
DE102010041464A1 (de) 2009-09-25 2011-04-14 Atmel Corporation, San Jose Verfahren und Vorrichtung zur Messung der Eigenkapazität unter Verwendung eines einzigen Pins

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7031886B1 (en) * 2004-12-14 2006-04-18 Synaptics Incorporated Methods and systems for detecting noise in a position sensor using minor shifts in sensing frequency
WO2009070814A2 (fr) * 2007-11-27 2009-06-04 Frederick Johannes Bruwer Élimination du bruit
DE102010041464A1 (de) 2009-09-25 2011-04-14 Atmel Corporation, San Jose Verfahren und Vorrichtung zur Messung der Eigenkapazität unter Verwendung eines einzigen Pins

Also Published As

Publication number Publication date
DE102016003779A1 (de) 2017-09-28

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