Novel symmetric hybrid multilevel topologies are introduced for both single-and three-phase medium-voltage highpower systems. The topology conception is presented in detail, where a three-level switching cell with low component count, and its modulation pattern give the origin of the proposed converters. Voltage sharing and low output-voltage distortion are achieved. The theoretical frequency spectra are derived. Switching devices are separated into high-and low-frequency devices, generating hybrid converters. Five-level three-phase topologies are generated from only three insulated dc sources, while the number of semiconductors is the same as for the cascaded H bridge. Both simulation and experimental results are provided showing the validity of the analysis.

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In this paper, a new non-insulated DC-DC converter called Double Quadratic Buck Converter is proposed. This new converter has the advantages of high gain ratio near half range of duty cycle compared to the conventional Buck Converter. The stress voltage over the switches is reduced to half of the value compared to the conventional Quadratic Buck Converter. The topological symmetry simplifies the theoretical analysis of the converter. A complete theoretical analysis is made. The converter operation stages with the respective waveforms are explained. Static gain, critical inductance and boundary conduction mode are equated in order to obtain the external behavior curve of the converter. Besides the static model will be presented in this paper the dynamic model of the converter and the control of input current and of output voltage.Words -Keys -Buck Converter, Quadratic Buck Converter, Double Quadratic Buck Converter.

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This article presents the study and implementation of a new asymmetric hybrid voltage inverter, for high voltage applications. The proposed inverter employs two types of modulation in low and high frequency (sinusoidal PWM). Simulations and experiment results are provided showing the validity of the analyses. These were obtained using a low-voltage single/three-phase prototype that demonstrated its operation.