Design And Realization Of The High-power High-frequency Switching Power Supply

According to the current development of the switching power supply, the author developed a 12KW DC high-frequency switching power supply, which output voltage can be adjusted from 20V to 32V. During the development of the switching power supply, the research method includes the theory analysis, the simulation and the practical experiments.Firstly, this paper describes the working principle and the control mode of the full-bridge DC-DC converter. This paper presents the detailed analysis of the soft Switching full-bridge topology, the principle and mode. Then , the main circuit modules , control circuit modules, and the monitoring circuit modules of the switching power supply are designed . UC1825A is the core of the control circuit modules. It uses current control mode, voltage and current control loop. This paper discussed synchronous circuit, voltage and current regulating circuit, current sharing circuit, protection circuit, driving circuit of the control circuit,control systems. By the data collected and disposed ,the supervise and control unit realized not only the function of control ,but also the functions of the on-line measure and modification , the display,the communication,and so on. The intelligentization is primary realized in the power supply.On the basic of the supply being installed and adjusted, the voltage/current waves were tested and analyzed that validated the MOSFETS were zero-voltage switch, and reduced the power supply loss. What measuring the output characteristic and efficiency proved the power supply performance having obtained designed requests. As the experimental results showing, the combining of the limited double pole control technology and the current loop & the voltage loop control technology had been proved the design of circuit reasonable.