In urban rail transit communication, the role of 48V communication power is very important, and his function is to ensure its stability, reliability and safety. Stability requires that the fluctuation of the voltage and frequency of the power supply must be within its allowable range. A reliable power supply is an independent power supply that can ensure uninterrupted power supply in the day and night. Safety refers to the measures to ensure the safety of the power supply equipment.

First of all, we need to ensure that the 48V communication power supply system of urban rail transit must be an independent power supply system. We must satisfy the first class of power supply requirements and get two reliable and independent power sources, one of which is dedicated line. Of course, the urban rail transit communication power supply equipment should meet the requirements of the communication equipment for the reliability of the power supply. Meet the demand for uninterrupted power supply. In the end, a centralized mode of power supply should be used for the communication equipment that requires DC power supply. The DC 48V communication power supply system can be composed of a DC distributor, a rectifier module, a DC converter, an inverter and a valve controlled closed lead-acid battery group. It should have remote communication, telemetry and telecontrol performance and standard interfaces and communication protocols.