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Method and circuit for enhancing capacitive touch key against mobile phone interference

A mobile phone interference and capacitive technology, which is applied in the method and circuit, enhances the field of anti-mobile phone interference of capacitive touch buttons, and can solve the problems of high cost, inability to isolate the sensing terminal, and increased system cost, etc., and achieves convenient operation and enhanced resistance to mobile phone interference. receptive effect

Active Publication Date: 2017-10-31
WUXI I CORE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and circuit for enhancing capacitive touch key against mobile phone interference
  • Method and circuit for enhancing capacitive touch key against mobile phone interference
  • Method and circuit for enhancing capacitive touch key against mobile phone interference

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Embodiment Construction

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

[0022] like 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 countin...

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PUM

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Abstract

The invention relates to a method and a circuit for enhancing the anti-jamming of a capacitive touch button by a mobile phone, which comprises the following steps: Step 1, judging whether a touch action occurs; Sampling the preset number of times in one cycle of the interference coupling signal; step 3, counting the number of touch actions identified in the preset number of samples in the above step 2; step 4, when the number of touch actions identified in step 3 is greater than the preset number of times When the threshold is touched, the cycle time of the touch button scan is adjusted to the conventional scan cycle time to perform conventional touch action judgment; otherwise, it is judged that there is mobile phone interference. The invention is easy to operate, increases and enhances the tolerance of the capacitive touch key to interference from mobile phones without adding components, and 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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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/96
Inventor 郭晖王成刘明峰饶喜冰
Owner WUXI I CORE ELECTRONICS