A method for improving the anti-electromagnetic interference performance of capacitive touch buttons
An anti-electromagnetic interference, capacitive technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as non-response, increased system cost, and slow response to touch buttons
Active Publication Date: 2018-12-11
SINO WEALTH ELECTRONICS
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Problems solved by technology
[0005] At present, many application solutions adopt the method of adding power filter circuit on the PCB to avoid the influence of electromagnetic interference, and some even suppress the electromagnetic interference by sacrificing the touch sensitivity when detecting electromagnetic interference.
The former will increase the cost of the system (such as the cost of the power module), while the latter will not respond to the touch keys slowly or at all in a continuous electromagnetic interference environment, although no false triggering is guaranteed.
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[0044] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the specification, claims and drawings disclosed in this specification , those skilled in the art can easily understand the related objects and advantages of the present invention.
[0045] figure 1 A structural block diagram of the capacitive touch key system is shown. Cx is the equivalent capacitance of the touch button, and forms a switched capacitor circuit with the logic control switches SW1 and SW2. fs is the switching frequency of the touch key system, which can periodically switch the logic control switches SW1 and SW2, and make them alternately turn on and off. According to the switch capacitance characteristics, the logic control switches SW1 and SW2 and the e...
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The invention provides a method for increasing anti-electromagnetic interference of a capacitive touch key. The method includes: providing a plurality of switch frequency points, selecting one of the switch frequency points as current key determination-purpose frequency point; determining whether the gradient of the key value under the current key determination-purpose frequency point exceeds a preset range; if the gradient of the key value exceeds the preset range, determining that the key value under the key determination-purpose frequency point is interrupted, and stopping employing the frequency point to conduct key determination; and using other frequency points that are free of interruption to conduct key determination.
Description
technical field [0001] The invention relates to touch technology, in particular to capacitive touch keys. Background technique [0002] In recent years, with the development of touch technology, especially capacitive touch technology, the application of capacitive touch buttons has shown a rapid growth trend, replacing mechanical buttons and widely used in various aspects such as home appliances, audio-visual equipment, computer peripherals, and automobile dashboards. [0003] The basic principle of the capacitive touch key is to judge whether a touch action occurs by detecting the change of the equivalent capacitance of the touch point. Commonly used circuits mainly include: relaxation oscillation circuit, charge transfer circuit and CDC (capacitance converted to digital signal) circuit. Each of the three circuits has its own advantages and disadvantages. The charge transfer circuit has a simple peripheral circuit and does not need peripheral resistors. The principle is ob...
Claims
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IPC IPC(8): G06F3/041G06F3/044
CPCG06F3/0418G06F3/044
Inventor 余为国许成珅何炜
Owner SINO WEALTH ELECTRONICS