Schematic diagram of a distributed power supply system

 　　Schematic block diagram of a distributed power supply system . The system consists of a front-end converter and a back-end converter: the front-end converter (Front End Converter) includes an AC/DC converter with power factor correction (PFC) and a 400/48 V DC/DC converter, both of which consist of several Modules are connected in parallel. After the AC input voltage is rectified, the 400V DC voltage is obtained through the PFC converter, and then the DC/DC converter converts the 400V DC voltage into a 48V DC voltage and connects it to the bus; the back-end converter is a set of load converters , or called POL (Point of Load) converter, converts the 48 V bus voltage into the DC voltage required by the load, such as 5 V, 3 V, etc. It can be seen that in distributed power supply systems , the parallel connection of AC/DC and DC/DC converter modules has been widely used.