Parallel High-frequency Bus Distributed Power Technology

Distributed power supply is a new technology of power supply which solves some problems such as low reliability, huge volume and weight in complex system .This thesis summarizes the development of low power multi-output power supply and distributed power supply. The concept of multi-output distributed power supply is introduced after that.The article makes a comparison among different types of bus, bus transmission signal and several familiar topologies of front-end converters and load-end converters. Finally, the half bridge converter with full-wave rectifier based on the high-frequency parallel-type AC bus bar is chosen as circuit structure and optimized. The working mode under different condition of the circuit is analyzed and a mathematical model is set up under continuous current mode. Simulation result is used as comparison.The thesis focuses on the circuit design and parameter selection, including the power circuit, control circuit and drive circuit of the front-end converter. Apart from that, for the load-end converter, the design and critical components selection of the traditional full-wave rectification and synchronous rectification are presented.Analysis of the bus transfer characteristics is detailed, including the modeling of transmission line and high-frequency coupled interference of transmission line. The lead-wire resistance and bus parasitic inductance is analyzed and modeled. These models are simplified by mathematical method and several common formulas on the calculation of bus parasitic parameters are given. The stability and reliability of main circuit and control circuit is verified through experiment result. The theory is verified through the comparison of voltage under different type of bus transmission.Multi-output distributed power supply has an extensive application because of its advantage of simple structure, high stability and reliability and flexible power way.