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Research on the influence of numerical features of random signal on stochastic modulation

The increasing frequency of power electronic switching devices has brought about serious electromagnetic interference (EMI) problems. Due to its ability to reduce noise, disperse harmonic energy and reduce electromagnetic interference, random modulation technology has drawn wide attention. According to the modulation function of switch function and its power spectrum model, this paper compares the modulation effects of random signals with different numerical characteristics and analyzes the influence of the numerical characteristics of random signals on the random modulation. The results show that the variance of random signal is the key factor to affect the random modulation effect. Within the allowable range of the variance value, applying the modulation technique with a larger variance random signal can better reduce the electromagnetic interference of the switching device.