M. Hartmann, H. Ertl:
"Design and Realization of a Multi-Cell-Switch-Mode Power Amplifier";
Talk: International Conference on Power Electronics and Intelligent Motion (PCIM), Nürnberg, Germany; 05-22-2007 - 05-24-2007; in: "Proceedings of the Power Electronics Intelligent Motion Power Quality", (2007), 1 - 6.

This paper presents a multi-cell switch-mode power amplifier formed by a series connection of six Hbridge
switching cells. The phase-shifted gating signals of the switching cells are generated using a
digital poly-phase-PWM implemented by application of a low-cost CPLD. The generation of the isolated
DC link voltages of the switching cells is performed by six series-resonant half-bridge DC/DC
converters. The advantages and drawbacks of the circuit topology and the proposed PWM scheme are
discussed based on measurements gained from a realized 400V/5A prototype system. There, especially
the impact of the delay of the digital modulator on the amplifiers dynamic behavior is analyzed.