Practical considerations using distributed power modules in decentralized power systems

The design of modern decentralized power systems in telecommunication applications are normally realized by using distributed DC/DC power modules. Power modules are usually characterized by high switching frequencies which enables the use of small ferrite magnetics and ceramic capacitors to enhance the reliability, the power density and the possibility of live insertion, all desired features in new power system designs. However, to utilize the advantages of power modules there are a number of considerations to be made in the design. This paper addresses these considerations by focusing on systems with an average power dissipation of <10 W/board, in free convection cooled cabinets, and <80 W/board, in forced convection cooled cabinets of commonly used mechanical sizes and designs for telecommunication equipment