Electromagnetic disturbance (EMD) refers to the noise emitted by electrical products, which causes significant voltage and current jumps during the on and off processes of power switches in switching power supplies at high frequencies, resulting in strong electromagnetic disturbance. However, the background harmonic control frequency range (< 30MHz) of the disturbance is relatively low. The geometric dimensions of most low-power switching power supplies are much smaller than the wavelength corresponding to a 30MHz electromagnetic field (about 10m in air medium). The electromagnetic disturbance phenomena studied in switching power supply systems belong to the range of quasi stable fields. When studying their electromagnetic disturbance problems, the main consideration is conducted disturbance
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