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A touch switch control circuit

A switch control circuit, touch technology, applied in electronic switches, electrical components, pulse technology and other directions, can solve the problems of normal touch control, affecting the sensitivity of touch detection, small touch area, etc., to reduce circuit costs, accurate and reliable response , the effect of high touch sensitivity

Active Publication Date: 2017-10-27
QX MICRO DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] figure 1 The disadvantage of the circuit shown is that the Vref compared with the output level of the low-pass filter is a set value, which will affect the sensitivity of touch detection, especially when the thickness of the medium becomes larger or the touch area is small, the normal touch control will occur Happening

Method used

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  • A touch switch control circuit
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  • A touch switch control circuit

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Embodiment Construction

[0026] First of all, the idea and working principle of the present invention are described:

[0027] The touch IC control scheme proposed by the present invention is as follows: figure 2 Shown:

[0028] The solution consists of touch detection unit A2D, dynamic self-comparison detection unit D2A, anti-shake delay module TIMER and logic control module LOGIC. The touch control circuit in the invention does not need peripheral devices when it works normally.

[0029] The technical problem actually solved by the invention is: how to realize the touch control function in the simplest, safest, most reliable and most economical way.

[0030] The working principle of the present invention is: the human body is equivalent to AC grounding, and the finger has a certain capacitance. When the finger touches the sensing terminal TOUCH, the touch detection unit A2D can be identified and output a corresponding electrical signal, which is the process of the unit A2D in the figure. The outp...

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PUM

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Abstract

The present invention relates to a touch switch control circuit, which includes a port (TOUCH) for detecting touch action and a touch signal detection unit (A2D) for generating a square wave signal, and is characterized in that it also includes a dynamic Self-comparison detection unit (D2A); D2A includes a first comparator (A1), a first low-pass filter (LPF1) between the first input of A1 and the output of A2D, and the other input of A1 and the output of A2D The second low-pass filter (LPF2) and the conduction control switch (SW) connected in series between the terminals, the time constant of LPF2 is greater than the time constant of LPF1; the control terminal of the conduction control switch (SW) is electrically connected to the output terminal of A1 , the conduction control switch (SW) is closed when there is no touch action at the TOUCH terminal. This control circuit does not need peripheral devices when it works normally, and is simple, safe, economical and has higher reliability.

Description

technical field [0001] The invention relates to an electronic circuit and signal processing technology, in particular to a highly integrated dynamic self-comparison capacitive touch detection control circuit technology that does not require peripheral devices. Background technique [0002] With the development of control technology, touch switches are gradually being used in the field of home appliances due to their safety, reliability, fashion and no switching noise. There are currently two main types of touch switches: resistive and capacitive. Among them, the capacitive touch switch is the most widely used. Capacitive touch sensing technology detects the touch action by detecting the small capacitance change between the metal electrode and the finger when the finger approaches, and can work through insulating materials (plastic, acrylic, glass, etc.). in: [0003] The traditional capacitive touch integrated circuit (IC) control circuit has a structure such as figure 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/96
Inventor 李伟华黄朝刚
Owner QX MICRO DEVICES
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