Power adapter control method and control apparatus

  • US 11,126,301 B2
  • Filed: 05/23/2017
  • Issued: 09/21/2021
  • Est. Priority Date: 05/26/2016
  • Status: Active Grant
First Claim
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1. A power adapter control method, comprising:

  • obtaining a scanning frequency of a touch panel (TP);

    obtaining a strength of a common mode noise generated by a power adapter at the scanning frequency of the TP;

    determining whether the strength of the common mode noise is greater than or equal to a preset threshold; and

    in response to determining that the strength of the common mode noise is greater than or equal to the preset threshold, adjusting a working frequency of a control integrated chip (IC) of the power adapter according to f=(2fTP+(n+1)Δ

    f)/(2n+1), wherein f is the working frequency of the control IC of the power adapter, of is a width of a wave crest of a fundamental frequency of the working frequency of the control IC of the power adapter, fTP is the scanning frequency of the TP, and n is an integer and enumerated, so that a strength of a common mode noise newly generated by the power adapter at the scanning frequency of the TP is less than the preset threshold, and wherein after adjusting the working frequency of the control IC of the power adapter, the scanning frequency of the TP is at a location of a wave trough of the common mode noise generated by the power adapter.

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