Comparative study of linear and nonlinear passivity-based control methods for switched-mode power supplies in audio amplification systems

This paper presents the comparison of linear and nonlinear passivity-based controllers used to enhance the performance of power supplies employed in audio amplification systems. Theoretical analysis and experimental results have shown that passivity-based control topologies can reduce the output impedance of the power supply, thus providing low level ripple on the voltage rails and allowing the reduction of the power supply output capacitor.