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《Power Electronics》 2006-01
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Design of a Cascade Multilevel Class-D Amplifier's Output Filter

ZHANG Ying,LI Yao-hua,SHENG Xiao-song(Chinese Academic of Science,Beijing 100080,China)  
A novel switch-mode class-D power amplifier based on a cascade multicell multilevel circuit topology is introduced in the paper.By application of the concept of multicell topology being operated in a phase-shifted SPWM control to switch-mode amplifier system,the effective switching of output results in 2N times the switching frequency of each full-bridge.Due to the phase-shifted SPWM control of the individual switching cells,the output voltage ripple of the total system is considerably small.Therefore,only a small output filter is required to suppress the switching frequency harmonics.The paper analyzes the output signal′s harmonic of class-D amplifier with vary modulation index M,gives guidelines for the design of the class-D amplifier′s LC output filter based on analyzing the system′s transfer function,output impedance and equivalent circuits.Simulation results as well as the measurements results taken from a laboratory setup are presented,which prove the design method of output filter is simple and utility.Consequently,the proposed amplifier shows an excellent dynamic behavior and a wide bandwidth.
【CateGory Index】: TN722.75;TN713
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