Control method of power adapter and control device

Abstract

The embodiment of the invention discloses a control method of a power adapter and a control device and relates to the technical field of computers. The problems are solved that when common-mode noise is relatively large in the whole operating frequency range of a TP, a clean operating frequency point cannot be found so that the interference of the common-mode noise to the TP cannot be lowered. The situation is avoided that the TP has no response when a user conducts continuous sliding operation on the TP. According to the technical scheme, the control method comprises the steps that the scanning frequency of the TP and the intensity of the common-mode noise generated by the power adapter under the scanning frequency of the TP are acquired; whether or not the intensity of the common-mode noise is large than or equal to a preset threshold value is judged; if yes, the working frequency of the power adaptor for controlling an IC is adjusted, so that the intensity of the common-mode noise newly generated by the power adaptor under the scanning frequency of the TP is smaller than the preset threshold value. According to the embodiment of the invention, the method is used for lowering the interference of the common-mode noise to the TP.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a control method and a control device for a power adapter. Background technique [0002] With the continuous development of communication technology, terminal devices (such as mobile phones, etc.) The board provides a human-computer interaction interface. As we all know, terminal equipment with a touch screen usually consumes a lot of power, so it needs to be charged frequently, but the power adapter is generally a switching charger. During the charging process, the switching frequency of the switching charger is greater than 20Khz. The electromagnetic interference is relatively large. like figure 1 As shown in the frequency spectrum of the common-mode noise generated by the power adapter in , the common-mode noise generated by the power adapter has a large amplitude in multiple frequency bands, such as figure 1 The spectrogram of the working signal of the TP shown, when th...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a control method and a control device for a power adapter, which solves the problem of common-mode noise generated by the power adapter when the method of adjusting the scanning frequency of the TP is used so that the common-mode noise generated by the power adapter does not interfere with the TP. In the case that the entire working frequency band of TP is large, it is impossible to reduce the interference of common mode noise generated by the power adapter on TP due to the inability to find a clean working frequency point, and avoid the continuous sliding of users on TP TP does not respond during operation

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