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A capacitance detection circuit and method

A capacitance detection and circuit technology, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of abnormal touch button function and distortion of capacitance detection results, and achieve ingenious design, accurate capacitance value, Practical effect

Active Publication Date: 2021-11-05
FREMONT MICRO DEVICES SHENZHEN LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] In the actual application of the touch button, it will inevitably be interfered by various factors (temperature, humidity, etc.), which will easily lead to distortion of the capacitance detection result, so that the function of the touch button is not normal

Method used

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  • A capacitance detection circuit and method
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Embodiment Construction

[0015] The technical problem to be solved by the present invention is: in the practical application of the touch key, it will inevitably be interfered by various factors (temperature, humidity, etc.), which will easily lead to distortion of the capacitance detection result, thereby making the touch key function unusual. The technical thinking that the present invention proposes with regard to this technical problem is: construct a kind of oscillator circuit, it adopts double ring ring oscillator to replace single ring ring oscillator, and the capacitor to be detected is connected between double ring ring oscillator; In the thinking, because the capacitor to be detected is in its detection process, the environmental noise and interference received by the two plates of the capacitor to be detected will be offset during the process of obtaining the frequency of the oscillator circuit output signal, so, based on the capacitance detection circuit of the present invention The detect...

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Abstract

The present invention proposes a capacitance detection circuit and method, the capacitance detection circuit includes an oscillator circuit (100), the first input terminal (C-detect1) of the oscillator circuit (100) and the capacitor to be detected (C1) The first terminal plate is electrically connected, and the second input terminal (C-detect2) of the oscillator circuit (100) is electrically connected with the second terminal plate of the capacitor to be detected (C1); the output of the oscillator circuit (100) The terminal (F-test) is electrically connected with the frequency detection circuit for detecting the output signal frequency of the oscillator circuit (100), and sending the output signal frequency of the oscillator circuit (100) to the frequency detection circuit, so that the frequency detection circuit according to The output signal frequency of the oscillator circuit (100) is deduced to deduce the capacitance value of the capacitor (C1) to be detected. The capacitance detection circuit and method of the invention are ingenious in design and strong in practicability.

Description

technical field [0001] The invention relates to the field of circuit detection, in particular to a capacitance detection circuit and method. Background technique [0002] At present, capacitive touch technology has been widely used in various household appliances such as desk lamps, refrigerators, washing machines, water heaters, etc., which has brought a lot of convenience to people's work and life; The capacitive detection circuit with touch action is the core content. The detection accuracy of the capacitance detection circuit is related to the monitoring accuracy of the touch action. [0003] In the actual application of the touch key, it is inevitable to be interfered by various factors (temperature, humidity, etc.), which will easily lead to distortion of the capacitance detection result, and thus make the touch key function abnormal. Therefore, a capacitance detection method with strong anti-interference ability is particularly important in actual product applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 许如柏刘桂云温靖康
Owner FREMONT MICRO DEVICES SHENZHEN LTD
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