Controller design of a new DC power supply with reduced number of switches

In this paper, a DC power supply based on dual-bridge matrix converter (DBMC) with reduced number of switches is proposed. Compared to other DC power supplies which using the conventional matrix converter, the proposed topology possesses high quality input current and output voltage, adjustable input power factor, and no large energy storage component. Moreover, it has more advantages than other proposed power supplies based on matrix converters. These include its simpler and safer commutation; reduced number of switches and simple control strategy. In the proposed topology only a simple voltage control loop ensures that the output voltage is regulated against load changes as well as input supply variations and the current control loop is not used to correct the input currents. Theory analysis and simulation are made to investigate performance of the proposed circuit. Simulation results show that in the proposed power supply with 7-switch, the input currents are of a high quality under varying load conditions and unbalanced input voltage.