Power Decoupling Method Using Input Filters in a Matrix Converter for Isolated AC-DC Converters Fed by Single- or Three-Phase Supply

This paper proposes a matrix converter (MC) control method capable of power decoupling (PD) for a single-phase input isolated AC-DC converter. The proposed converter can also be fed by a three-phase grid power supply without any additional components. The PD circuit consists of two capacitors in the input filters and two switches in the MC. This configuration requires no additional components for PD, and it absorbs the grid power ripple to provide a constant DC voltage to a load. All switching in the MC is zero-voltage switching or zero-current switching to suppress switching losses. Moreover, the proposed method achieves a sinusoidal grid current and a high output frequency. A feedback control to compensate for error in the DC output voltage is also applied. The proposed method was evaluated experimentally.