Research On A Wireless Network Controlled Parallel DC/DC Converter System

With the rapid development of science and technology, safe and reliable power supply with large capacity is needed for various electronic devices, In case such requirement cannot be satisfied by the single power supply, while multi-module paralleling mode power supply can successfully solve this problem. As a consequence,the research on average-current control has become one of hot spots in the field of power electronics.The development of digital signal processing technology and communications technology make the system paralleled without interconnection lines becomes possible.Compared to conventional parallel system with interconnecting lines, the former is more easy to maintain and reconstruction. In this paper, buck converter was selected as the main circuit, a DC/DC parallel system based on wireless communication and digital control was designed and studied. Specifically include the following:1. By analyzing commonly used streaming technology, digital current sharing and power control mode, the current sharing scheme was determined.2. Several common topologies were analyzed and the buck converter was selected as main circuit., select buck converter circuit as the main paper. The buck converter was modeled by the method of state space. Then the double-loop PI controller consist of outer voltage loop and inner current loop was designed. By MATLAB simulation software, the simulation model of the system was built to verify the effectiveness of the controller.3. The wireless module consist of MSS 1832 + MSR 1842 are selected to transmit the current-sharing information between parallel modules. The potential delay and packet loss in wireless communication are analyzed theoretically. And the validity of the theory is verified by MATLAB simulation..4. The system base on digital control chip FPGA is designed. Including hardware and software design.5. The experimental platform of the parallel system is built and the steady-state,transient performance and the impacts of time-delay in wireless networks are tested.Experimental results show the feasibility of wireless communications technology used in DC / DC Parallel System and the theory of delay is valid.