Reduction in electromagnetic interference of switching converters using self-excitation-chaos

We derived a second-order S-switching iterative map describing the dynamics of simple feedback Buck switching regulator operating in continuous mode. Analysis of this map shows that chaos and bifurcations may occur along with the changing of values of some system parameters. By making the converter operating in chaos, the simulation results demonstrate that a reduction of spectral peak and consequent spreading of the spectrum can be shown, any desirable amount of reduction and consequent spreading of the spectrum can be obtained simply by varying the control parameter of the circuit and a optimization of system bifurcation parameters is designed to obtain better performances of the converter on electromagnetic compatibility (EMC). Moreover this will hardly influence to output voltage ripples.