A control method and control device for a power adapter

Abstract

The embodiment of the present invention discloses a control method and a control device for a power adapter, which relate to the field of computer technology, and solve the problem that when the common mode noise is large in the entire working frequency band of TP, it is impossible to find a clean working frequency point. The problem that the common mode noise interferes with the TP cannot be reduced, and the phenomenon that the TP does not respond when the user performs continuous sliding operations on the TP is avoided. The specific scheme is: obtain the scanning frequency of TP, and the intensity of common mode noise generated by the power adapter at the scanning frequency of TP; determine whether the intensity of common mode noise is greater than or equal to the preset threshold; when the intensity of common mode noise is greater than or equal to When the threshold is preset, the operating frequency of the control IC of the power adapter is adjusted so that the intensity of common mode noise newly generated by the power adapter at the scanning frequency of TP is less than the preset threshold. The embodiment of the present invention is used in the process of reducing 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. Such as 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...

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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