DSP Based Series-Parallel Connected Two Full-Bridge DC-DC Converter with Interleaving Output Current Sharing

作者：Sha Deshang^*; Guo Zhiqiang; Liao Xiaozhong

来源：Journal of Power Electronics, 2010, 10(6): 673-679.

• Current sharing
• Digital control
• Input-series and output parallel
• Modular DC/DC converters
• Phase shifted full-bridge
• Voltage sharing

Input-series output parallel (ISOP) connected DC-DC converters enable low voltage rating switches to be used in high voltage input applications In this paper, a DSP is adopted to generate digital phase-shifted PWM signals and to fulfill the closed-loop control function for ISOP connected two full-bridge DC DC converters Moreover a stable output current sharing control strategy is proposed for the system, with which equal sharing of the input voltage and the load current can be achieved without any input voltage control loops Based on small signal analysis with the state space average method a loop gain design with the proposed scheme is made Compared with the conventional IVS scheme the proposed strategy leads to simplification of the output voltage regulator design and better static and dynamic responses The effectiveness of the proposed control strategy is verified by the simulation and experimental results of an ISOP system made up of two full-bridge DC-DC converters

• 出版日期2010-11
• 单位北京理工大学