Abstarct: With the advancement in power electronic devices the relevant high power circuits have been developed. There is an AC/DC converter in the input of many power electronic circuits. The simplest AC/DC converter is a diode bridge with capacitor filter. This converter acts as a nonlinear load which has a great role in harmonic injection and distortion in the power system grid. Therefore, there is an increasing request for AC/DC converters with power factor correction capability in spite of high price. High Power telecommunication power supply systems consist of a three-phase switch mode rectifier followed by a DC/DC converter to supply loads at 48 VDC. These rectifiers draw significant harmonic currents from the utility, resulting in poor input power factor with high total harmonic distortion (THD). In this report, a DC power supply baxsed on matrix converter with reduced number of switches is proposed for telecommunication applications. In the proposed approach, the low frequency (50Hz, three-phase) input is converted to a DC lixnk by proper switching of three switches that these switches have specific arrangement of diodes. A single-phase bridge inverter converts the DC-lixnk to a high frequency (25 KHz, one-phase) AC output. The output of the matrix converter is then processed via a high frequency isolation transformer and rectified to 48VDC. 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. The input currents are of a high quality and do not include of any low frequency harmonics under varying load conditions. Therefore, the current control loop is not used to correct the input currents. So, its control circuit is not complicated. Simulation results verify the feasibility of the proposed converter.