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Capacitor measuring touch sensing identifying method and implementing device

A touch-sensing and capacitive technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of large sensitivity changes, high cost, and easy false triggering

Inactive Publication Date: 2006-09-13
BEIJING SIGMACHIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the current tact switch implementations have the following disadvantages: high cost; high power consumption; sensitivity varies greatly with environmental changes, and it is easy to trigger by mistake

Method used

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  • Capacitor measuring touch sensing identifying method and implementing device
  • Capacitor measuring touch sensing identifying method and implementing device
  • Capacitor measuring touch sensing identifying method and implementing device

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0037] Switching circuits S1 and S2 can be implemented with MOS tubes. The affiliated switch circuit can also be realized by triode, relay, photocoupler and so on.

[0038] A reference voltage V for comparison is generated at the comparator input ref The value is less than one-half of the charging voltage per charge, that is, less than V DD / 2, if the reference voltage value is high, a certain system error will be introduced. Compare the voltage at the charge store Cc with the reference voltage V ref The difference is used to generate an enable control signal for the counter.

[0039] The touch-sensing device must have the ability of self-adaptation - the charging time of the sensing point will change with the temperature and humidity of the environment in which it is located. Judging that there is a touch action is achieved by reading the charging time value of the sensing point twice and making a difference, and then comparing it with the previously specified standard de...

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PUM

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Abstract

This invention relates to a touch sensing method for testing condensers, which converts the variance of condensers to that of charges then to be turned to measured voltage, in which, the method includes the following steps: a, charging to sensing point Cs and the charged voltage of each is VDD, b, transferring the charge of sensing point Cs to charge storage Cc, c, measuring the charge volume at Cc and converting it to voltage. A light-touch switch device for testing capacitance includes a touch sensing device and a touch identifying system.

Description

technical field [0001] The invention relates to a capacitance measurement touch sensing and identification method and a realization device, which can be applied to various integrated touch switch devices. Background technique [0002] Most of the current implementation schemes of tact switches have the following disadvantages: high cost; high power consumption; sensitivity changes greatly with environmental changes, and it is easy to trigger by mistake. Contents of the invention [0003] The purpose of the present invention is to provide a touch switch with low cost, low power consumption, adjustable sensitivity and low false trigger rate to address the shortcomings of the prior art. [0004] According to the above purpose, the present invention provides a touch sensing method and a recognition method. The change of the capacitance of the sensing point is converted into a change of charge, and then converted into a measurable voltage. By measuring the voltage of the sensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/96H03K17/955
CPCH03K2017/9602H03K2217/960725H03K17/962H03K2217/94031
Inventor 李志谦
Owner BEIJING SIGMACHIP CO LTD
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