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Common-mode noise filtering method, MCU, touch device and storage medium

A technology of common mode noise and preset frequency, which is applied in the direction of instruments, electrical digital data processing, electrical components, etc., can solve the problems of insufficient noise suppression, affecting the sensitivity of touch sensors, and even false keys, etc., to achieve the effect of noise suppression

Pending Publication Date: 2020-03-31
SHENZHEN GOODIX TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the touch sensor is charged by the charger, the ripple interference of the power supply will introduce common mode noise. If the noise is not suppressed, it will affect the sensitivity of the touch sensor. In severe cases, the touch button is mistakenly identified as the presence of a finger press. , that is, there is a situation where there is even a key
[0004] In the prior art, the common-mode noise is filtered by connecting inductance and capacitance in series on the above-mentioned channel. However, since the touch sensor has relatively high sensitivity requirements, this filtering method is far from enough for noise suppression for the touch sensor; In addition, if capacitance is added to the channel, the capacitance will even generate mutual capacitance with the touch sensor, introducing additional interference to the touch sensor

Method used

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  • Common-mode noise filtering method, MCU, touch device and storage medium
  • Common-mode noise filtering method, MCU, touch device and storage medium
  • Common-mode noise filtering method, MCU, touch device and storage medium

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Embodiment Construction

[0036] As mentioned above, current touch devices include: a microcontroller unit (Microcontroller Unit, MCU) and touch keys, wherein there is a channel between the MCU and the touch keys. figure 1 It is a schematic diagram of the connection between the MCU and the touch button, such as figure 1 As shown, the typical touch buttons that currently exist include: button-type touch buttons, slider-type touch buttons and round-shaped touch buttons. Touch sensors are arranged under these touch buttons, so the above-mentioned touch buttons can also be called touch-sensing electrodes. ,Such as figure 1 Buttons 0, 1, and 2 are all button-type touch buttons, button 3 is a round-shaped touch button, and button 4 is a slider-type touch button. Among them, the slider-type touch button is equivalent to being composed of 3 touch buttons or units, and the circular touch button is equivalent to being composed of 4 touch buttons or units. Each touch button or unit is connected to the MCU throug...

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Abstract

The invention provides a common-mode noise filtering method, an MCU, a touch device and a storage medium. The common-mode noise filtering method comprises the steps that the current voltage of a channel at the current moment and N historical denoising voltages at N moments before the current moment are acquired, and N is an integer larger than 1; and obtaining a denoising voltage corresponding tothe current voltage according to the current voltage and the N historical denoising voltages. Because the data of the wave crests and the wave troughs of the current voltage and the N historical de-noising voltages can be cancelled out, the de-noising voltage corresponding to the obtained current voltage is gentler, and the effect of noise suppression is achieved. In addition, no extra capacitor needs to be introduced, so that no extra interference is introduced to the touch sensor.

Description

technical field [0001] The present application relates to the field of touch technology, and in particular to a common mode noise filtering method, MCU, touch device and storage medium. Background technique [0002] Currently, touch devices are frequently used in people's daily life, such as gas stoves, touch lamps, and the like. These touch devices include: Microcontroller Unit (Microcontroller Unit, MCU) and touch keys, wherein there is a channel between the MCU and the touch keys, and a touch sensor is arranged under the touch keys. [0003] Common mode noise, also known as asymmetric noise or line-to-ground noise, is present at the input of electrical equipment using AC power. Therefore, when the touch sensor is charged by the charger, the ripple interference of the power supply will introduce common mode noise. If the noise is not suppressed, it will affect the sensitivity of the touch sensor. In severe cases, the touch button is mistakenly identified as the presence o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/05H03K17/96
CPCG06F3/05H03K17/962
Inventor 朱明李庆斌周伟
Owner SHENZHEN GOODIX TECH CO LTD
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