The paper presents the effectiveness of EMI suppression of switching converters with a chaotic frequency modulation scheme.Arguments are given highlighting the link between the spectrum of the modulated signal and the invariant probability density function of the chaotic system generating the modulating signal.A simple Ber noulli-map chaotic circuit is designed and adopted as the modulating signal source.The discrete-time chaotic signal is incorporated into the Boost converter operating in the double-loop control mode

thus the switching frequency varies randomly with the chaotic signal.The experimental results have confirmed the advantage of the proposed method and its applicability for switching converters.