A capacitance detection circuit and method

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...

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

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