Phase-Lagging Operation in a Buck-Type Current Unfolding Converter with Discontinuous Conduction Mode

This paper proposes a three-phase inverter using the current unfolding principle with discontinuous conduction mode (DCM). The proposed inverter is expected to raise efficiency by reducing the total number of switching compared with popular inverters. The inverter can also reduce the number and size of passive components resulting in miniaturizing the inverter size. In addition, the operation with discontinuous conduction mode proposed in this paper enables the proposed inverter to operate under a low power factor. The operation validity of the proposed inverter is confirmed through simulations and experiments. The simulation result of the DCM operation exhibits good sinusoidal waveforms compared with that of the CCM. It is expected that the proposed inverter can achieve high efficiency and reduce the size and number of passive components at the same time.