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H. Votzi, H. Ertl, F. Himmelstoß:
"Active Hybrid Filter Applied with a Multi-Cell Switch-Mode Power Amplifier";
Talk: International Power Electronics and Motion Control Conference (EPE-PEMC), Budapest / Hungary; 2018-08-26 - 2018-08-30; in: "2018 IEEE 18th", (2018), 52 - 57.

This paper discusses an active filtering method applied
on a multi-cell switch-mode power amplifier. One main purpose
of this system is to build high quality power sources up to the
kW-region. The system is formed by a switch-mode and a linear
amplifier. The power allocation of the two parts is
approximately 10:1 depending on the operation mode of the
system. The switch-mode power amplifier is realized by a multicell
amplifier with a passive LC-filter, which is actively damped
by feeding back the capacitor current. The workload of the
linear amplifier is influenced by the factors input frequency and
load current which are examined in this paper. The benefit of
the presented system is the low rated voltage and current of the
linear stage. The performance of the whole system´s output
voltage is demonstrated by measurements in the time domain
and by high resolution spectra.

Hybrid Filter, switch-mode ,

https://publik.tuwien.ac.at/files/publik_276324.pdf