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Method for enhancing mobile phone interference resistance of capacitive touch button and circuit thereof

A mobile phone interference and capacitive technology, which is applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of inability to isolate the sensing terminal, high cost, and increased system cost, and achieve enhanced mobile phone interference tolerance and easy operation Effect

Active Publication Date: 2014-10-15
WUXI I CORE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal shield cannot isolate the sensing end, and the cost is high. When the interference of the sensing end is strong enough, it can still affect the recognition of the touch button. The method of adding a filter circuit on the PCB will also increase the system cost.

Method used

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  • Method for enhancing mobile phone interference resistance of capacitive touch button and circuit thereof
  • Method for enhancing mobile phone interference resistance of capacitive touch button and circuit thereof
  • Method for enhancing mobile phone interference resistance of capacitive touch button and circuit thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0022] Such as figure 1 Shown: In order to enhance the tolerance of the capacitive touch button for mobile phone interference without adding components, the method for anti-mobile phone interference of the present invention includes the following steps:

[0023] Step 1. Determine whether there is a touch action;

[0024] During specific implementation, the method provided in the public document CN101060321A is used to judge whether there is a touch action, that is, in the scanning period of the touch key, the number of switching times of the switch S1 and the switch S2 is counted by the counter, and then the count value in the counter is compared with the The counting value processing and judging unit calculates the difference between the charging time when there is no touch, and when the difference is greater than the preset standard deviation value, the coun...

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Abstract

The invention relates to a method for enhancing mobile phone interference resistance of a capacitive touch button and a circuit thereof. The method comprises the following steps: step 1, generation of a touch motion is judged; step 2, after generation of the touch motion, periodic time of touch button scanning is adjusted so that preset number of times of sampling is performed within one period of an interference coupling signal; step 3, statistics is performed on the number of times of identification of the touch motion in the preset number of times of sampling in the aforementioned step 2; and step 4, when the number of times of identification of the touch motion in the step 3 is greater than a preset touch threshold, periodic time of touch button scanning is adjusted to regular scanning periodic time so that regular touch motion judgment is preformed, or mobile phone interference exits through judgment. The method is convenient to operate, and mobile phone interference resistance of the capacitive touch button is enhanced without additional arrangement of elements and components so that the method is safe and reliable.

Description

technical field [0001] The invention relates to a method and a circuit, in particular to a method and a circuit for strengthening a capacitive touch button against interference from mobile phones, and belongs to the technical field of touch anti-interference. Background technique [0002] In recent years, with the wide application of touch technology, capacitive touch for button applications has shown rapid growth. Capacitive touch buttons not only appear in high-end products such as TVs, monitors, and kitchen appliances, but also penetrate into all aspects of consumer electronics. [0003] Most of the touch key switches adopt the method of capacitance measurement, and judge the change of the capacitance value of the sensing point by calculating the change of the charge on the capacitance at the sensing point, so as to determine whether the touch action occurs. Publication number is that the document of CN101060321A discloses a kind of touch sensing method, for publication ...

Claims

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Application Information

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IPC IPC(8): H03K17/96
Inventor 郭晖王成刘明峰饶喜冰
Owner WUXI I CORE ELECTRONICS