Anti-interference method and device for capacitance detection

Abstract

The invention provides an anti-interference method for capacitance detection. The method comprises the steps that one of a plurality of capacitance detection channels is set as a single capacitance detection channel; a detection signal of the single capacitance detection channel is detected; when it is determined that the capacitance count value of the detection signal is equal to a first preset threshold value, the other capacitance detection channels are closed, and the capacitance count value of the detection signal is continuously monitored; when it is detected that the capacitance count value of the detection signal is equal to a second preset threshold value, the other capacitance detection channels are opened for detection; signals detected by the capacitance detection channels are processed. According to the anti-interference method for capacitance detection, an interference rule and an interference period are found, an interference gap is found, the detected signals are processed, products can work without interference, and influences caused by an interference source are eliminated thoroughly. The invention further discloses a touch device.

Description

technical field [0001] The invention relates to the technical field of capacitance detection, in particular to an anti-interference method and device for capacitance detection. Background technique [0002] While grid interconnection provides convenience, it also presents some problems. For example, the interconnection of power grids leads to great cross-interference on the power grid, which has a serious impact on the performance of products, especially for sensitive devices, such as capacitance detection equipment. Therefore, one of the topics that engineers are working on is how to ensure the stability of sensitive device products and improve the anti-interference ability of products. [0003] Existing technical solutions include limiting filtering method, arithmetic mean filtering method, first-order lag filtering method and the like. [0004] The limiting filtering method is also called the program judgment filtering method, and the steps include: determining the maxi...

AI Technical Summary

Problems solved by technology

The advantage of the first-order lag filtering method is that it has a good suppression effect on periodic interference and is suitable for occasions with high fluctuation frequencies; the disadvantage is that the phase lag, low sensitivity, and the degree of lag depends on the size of the coefficient, and it cannot eliminate the effect that the filtering frequency is greater than the sampling frequency. 1 / 2 of the interfering signal

[0007] To sum up, the existing technology mainly adopts the method of screening data for periodic strong interference, and adjusts the state in the interference to weaken the impact of the interference, but it does not solve the problem caused by the interference from the root.

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