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Detection method and device for proximity sensing

A technology of proximity sensing and detection method, applied in the field of proximity sensing, which can solve the problem that the capacitive proximity sensor cannot detect the departure of human hands, and achieve the effect of reducing the influence of environmental factors and improving accuracy

Active Publication Date: 2019-01-18
SHANGHAI AYOU INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of this application is to provide a detection method and device for proximity sensing to solve the problem that the capacitive proximity sensor cannot detect the departure of the human hand after it is in the trigger state for a long time

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  • Detection method and device for proximity sensing
  • Detection method and device for proximity sensing
  • Detection method and device for proximity sensing

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Embodiment Construction

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0029] It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for...

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Abstract

The invention discloses a detection method and device for proximity sensing. The method comprises the following steps: acquiring a first initial capacitance when a capacitive proximity sensing sensoris in a non-triggered state, filtering the first initial capacitance to acquire a first reference capacitance and a first fluctuation capacitance; detecting whether the first fluctuation capacitance is greater than a first noise capacitance or not; and if the first fluctuation capacitance is greater than the first noise capacitance, performing temperature difference compensation operation on the first initial capacitance. The initial capacitance is subjected to the temperature difference compensation operation by adopting the mode of respectively acquiring the initial capacitance in a triggered state and the non-triggered state of the sensor, so that the aim of state judgment after reducing the influence of environmental factors is fulfilled, and the technical effect of improving the statejudgment accuracy is achieved; and the problem that hands away cannot be detected if the capacitive proximity sensing sensor is in the triggered state for a long time is solved.

Description

technical field [0001] The present application relates to the field of proximity sensing, in particular, to a detection method and device for proximity sensing. Background technique [0002] The capacitive proximity sensor detects whether a human hand is approaching by sensing the capacitance change caused by the approach of a human hand. It can be used as a button or a proximity sensor switch instead of a traditional mechanical button. When there is no hand approaching, the capacitive proximity sensor will form a parasitic capacitance Cp with the outside world. When there is a human hand approaching, an additional capacitance Ch will be introduced, and the total capacitance is C=Cp+Ch. In actual use, the parasitic capacitance Cp is easily affected by external environmental factors (especially temperature) and changes Cp'. When Cp' is equal to Ch, false triggering will occur. The change Cp' of the parasitic capacitance caused by environmental changes is often relatively slo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24G01V3/00
CPCG01D5/24G01V3/00
Inventor 夏孙城李自强林兆雄
Owner SHANGHAI AYOU INFORMATION TECH CO LTD
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