Switching power supply distribution structure

      A large number of magnetic components are used in the power system. The materials, structure and performance of the high-frequency magnetic components are different from those of the power frequency magnetic components, and many problems need to be studied. The magnetic material used for the high-frequency magnetic component has the following requirements: low loss, good heat dissipation performance, and superior magnetic properties. Magnetic materials suitable for megahertz frequencies are of interest, and nanocrystalline soft magnetic materials have also been developed. After high frequency, in order to improve the efficiency of the switching power supply, soft switching technology must be developed and applied.

     For soft-switching converters with low voltage and high current output, the measure to further improve their efficiency is to reduce the on-state loss of the switch. For example, the synchronous rectification SR technology, in which the power MOS transistor is reversely connected as a rectifying switching diode, instead of a Schottky diode (SBD), can reduce the tube voltage drop, thereby improving circuit efficiency. The distributed power system is suitable for use as a power source for large workstations (such as image processing stations) and large digital electronic switching systems composed of ultra-high-speed integrated circuits. The advantages are: modularization of DC/DC converter components; easy implementation of N+ 1 power redundancy, easy to amplify the load capacity; can reduce the current and voltage drop on the 48V bus; easy to achieve uniform heat distribution, easy to heat design; transient response is good; can replace the failed module online.

     There are currently two types of distributed power systems, one is a two-stage structure and the other is a three-level structure.