Spread Spectrum Technique With Random-Linear Modulation for EMI Mitigation and Audible Noise Elimination in IH Appliances

In this letter, a random-linear modulated spread spectrum technique for the induction heating (IH) appliances is proposed. The proposed method can effectively mitigate electromagnetic interference (EMI) emissions and can eliminate audible noises. Besides, it can suppress the total harmonic distortion (THD) compared with other modulations. The proposed random-linear modulation is evaluated by using a 1.8-kW IH prototype system. Experimental results verify the performance of EMI mitigation, audible noise elimination, and low THD using the proposed random-linear modulation compared with those of the conventional periodic and random modulations.