Mutual capacitance detection device and method

By using a combination of an excitation module and a synchronous detection circuit in a smart wearable device, along with a low-pass filter and a state judgment module, the problem of low mutual capacitance detection accuracy is solved, achieving high-precision and low-cost mutual capacitance detection.

CN122410133APending Publication Date: 2026-07-17SHENZHEN RONGXIN SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN RONGXIN SEMICON CO LTD
Filing Date
2026-03-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing capacitance detection technologies struggle to achieve high-precision mutual capacitance detection in complex human environments, resulting in complex detection schemes that fail to meet the requirements for accuracy and stability.

Method used

An excitation module sends a preset spectrum signal, a synchronous detection circuit performs amplitude detection, and a low-pass filter and a state judgment module are used to accurately obtain the mutual capacitance through signal amplification and phase adjustment.

Benefits of technology

This method enables high-precision mutual capacitance detection with low complexity, reducing detection costs and improving detection accuracy and stability.

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Abstract

本发明提供了一种互容检测装置及方法。本发明提供的互容检测装置，包括激励模块、同步检波电路、低通滤波器和状态判断模块；激励模块，用于对待检测互电容发送第一预设频谱信号，并对同步检波电路发送具有第一预设相位的同步检波信号；同步检波电路，用于在待检测互电容根据第一预设频谱信号输出第一互容信号后，根据具有第一预设相位的同步检波信号对第一互容信号的幅度进行检测，得到第一检测信号；低通滤波器，用于对第一检测信号进行滤波，得到滤波后的第一电压信号；状态判断模块，用于根据滤波后的第一电压信号获取待检测互电容的互容大小。本发明的互容检测装置，可以以较低复杂度的方案，实现较高精度的互电容检测。
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