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This paper presents a new modulation for modular multilevel converters (MMC) based on a simple idea, which is very easy to implement. It consists of playing with the relative behaviour of each phase in order to obtain the desired AC voltage. This method also assures that the voltage capacitor in each sub-module remains constant. Moreover, this converter allows the operation of the system under unbalanced...
This paper presents the integration of a single stage envelope amplifier with a switched class E amplifier using the Kahn's technique or envelope elimination and restoration (EER). This technique is based on the combination of a switched and high efficient power amplifier supplied by a hi gh efficient envelope amplifier to obtain a linear and highly efficient RF amplifier. This work is focused on...
Power amplifier supplied with constant supply voltage has very low efficiency in the transmitter. A DC-DC converter in series with a linear regulator can be used to obtain voltage modulation. Since this converter should be able to change the output voltage very fast, a multiphase buck converter with a minimum time control strategy is proposed. To modulate supply voltage of the envelope amplifier,...
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