Experimental validation demonstrates reduced voltage ripple and conducted interference in LLC converters, indicating improved electromagnetic compatibility without compromising power stability.
As an effective EMI suppression means, the spread spectrum modulation (SSM) technique introduces frequency variations that lead to drastic fluctuations in the output voltage of LLC resonant converters. In this paper, a dual-random-number interleaved spread spectrum modulation (DRNISSM) is proposed based on the analysis of power spectral density theory. The parameter design of DRNISSM is optimised by comparing and analysing the effects of different random frequency distribution types and key spread spectrum parameters on SSM results. Simulation and experimental verification on an LLC converter show that the output voltage under DRNISSM has a peak-to-peak value of 0.43 V and a ripple coefficient of 1.7%, with an improvement of 52% compared with the ripple of ordinary random SSM. At a spreading ratio of 8%, DRNISSM can reduce the conducted interference spectral peaks by nearly 10 dBV, with clearly better performance in the high-frequency band.
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Wang et al. (2026) studied this question.
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