A conventional high power DC power supply systems consist of a three-phase diode rectifier followed by a high frequency converter to supply loads at regulated DC voltage. These rectifiers draw significant harmonic currents from the utility, resulting in poor input power factor. In this paper, a DC power supply based on dual-bridge matrix converter (DBMC) with reduced number of switches is proposed. In the proposed circuit, three switches convert the low frequency AC input to a DC link. A single-phase bridge inverter converts the DC-link to a high frequency AC output. The output of the matrix converter is then processed via a high frequency isolation transformer and rectified to the regulated DC voltage. 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 input voltage.

常规的大功率直流电源系统包括一个三相二极管整流器，其后是一个高频转换器，用于以稳定的直流电压提供负载。这些整流器从公用事业中汲取大量谐波电流，从而导致不良的输入功率因数。本文提出了一种基于双桥矩阵变换器（DBMC）的直流电源，其开关数量减少了。在提出的电路中，三个开关将低频交流输入转换为直流链路。单相桥式逆变器将直流母线转换为高频交流输出。然后，通过高频隔离变压器处理矩阵转换器的输出，并将其整流为调节后的直流电压。在提出的拓扑中，只有一个简单的电压控制环路可确保针对负载变化以及输入电源变化来调节输出电压，并且不使用电流控制环路来校正输入电流。进行了理论分析和仿真以研究所提出电路的性能。仿真结果表明，在提出的7开关电源中，在变化的负载条件和输入电压下，输入电流的质量很高。