New cascade diode H-bridge multi-level rectifier

In allusion to current circulation through the switch and the corresponding diode rectifier bridge in certain conditions leading to other cascaded diode rectifier bridges withstand the full supply voltage in traditional cascaded diode H-bridge multi-level Rectifier, a novel cascade diode H-bridge multi-level structure is proposed. Not needing power frequency phase-shifting transformer, the proposed topology is composed of cascaded H-bridge diode rectifier and boost circuit modular units, by which the high power factor rectify, the output of stabilized voltage of cascaded modular units and voltage-sharing control can be implemented. The basic working principle of the proposed topology, mathematical modeling and phase diagram of the circuit and its steady state characteristics are discussed, and corresponding control strategy is given. The feasibility of the proposed topology and control strategy is validated by simulation results and experimental results.