Research On Full Bridge Phase-shifted Converter Based On Digital Control

Higher frequency ,modular construction and digitalization is the main development tendency in the field of the switching power supply .High power density and high frequency converter is based on soft-switching techniques. Full Bridge Phase-Shifted Zero-Voltage-Switched Converter (FBPS-ZVS Converter) is a successful implementation for Soft-switching and is easy for usage in DC/DC converter .The core technique to reach digitalization is DSP technique .In order to reach both high frequency and digitalization of converter ,a FBPS-ZVS Converter based on DSP control is proposed in this paper The converter worked on the high frequency of 150K.Periphery hardware circuit is simple and its bulk is small .The converter realizes soft-switching over half load and get a high efficiency .It achieves the aim of digital control and error protect.In the first chapter ,the study background .direction and main content of this paper are presented .In the second chapter ,the character and application of Motorola DSP chip ,the system design of this power supply and a small-signal model of FBPS converter are introduced .In the third chapter ,the operation of FBPS converter is analyzed in detail and the design of hardware is given .In the fourth chapter particular software design and program flow are given .The result and analyse of experiment are given in this chapter too .In the last chapter ,summarize of full paper and works followed are given.