Switching power supply frequency adaptive adjustment method, system and electronic device

A system for adaptively adjusting frequency of a switching power supply, comprising:

• a signal-to-noise ratio (SNR) value obtaining unit, configured to obtain an SNR value of an AM/FM radio demodulator in real time;
• a control signal output unit, configured to output different control signals;
• a comparing unit, configured to compare a preset SNR threshold to the SNR value obtained in real time, and when the SNR value is smaller than the preset SNR threshold, output a plurality of control signals to the switching power supply;
• a frequency obtaining unit, configured to obtain a plurality of operation frequencies of the switching power supply at which the switching power supply is controlled by each of the plurality of control signals;
• wherein the comparing unit is further configured to compare a plurality of SNR values corresponding to the plurality of operation frequencies, to obtain a maximum SNR value;
• and
• wherein the system further comprises:
• a switching power supply unit, configured to output a control signal corresponding to the maximum SNR value, and control an operation frequency of the switching power supply with the control signal;
• and
• a timing unit, configured to obtain an adjustment period, and
• wherein the SNR value obtaining unit is further configured to obtain an updated SNR value of the AM/FM radio demodulator based on the adjustment period.