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Study and Analysis of Demodulation Filter Losses in DCI-NPC Multilevel Power Amplifiers

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This paper presents a less studied source of efficiency losses in Multilevel Diode-Clamped-Inverter or Neutral-Point-Converter (DCI-NPC) Power Switching Amplifiers. Filter inductors generally adds another significant contribution to the total power loss in Power Switching Amplifiers systems. This contribution is generally comparable to that of the switching power stage and it is important to obtain a reasonable accurate estimate of the losses. In this it is studied and analyzed the four possible sources of losses in the demodulation filter and are defined the expressions to calcule the value of the losses. Using these loss expressions, this work analyzes the contribution of each of the sources. This work concludes presenting the results of simulation and the conclusions.

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