A current distribution strategy for parallel DC-DC converters based on the efficiency model

作者：Sun Jinkun^*; Liu Qingfeng; Leng Zhaoxia; Wang Huamin; Tong Xiangqian

来源：Proceedings of the CSEE, 2013, 33(15): 10-18.

• Constraint conditions
• Continuous conduction mode
• Current-sharing
• Efficiency optimization
• Operation efficiencies
• Optimization object function
• Parallel DC-DC converters
• Paralleling

For utilizing energy availably, the system efficiency of distributing power supply ought to be improved possibly; the system is composed of DC-DC converters with uniform or different power grade. In this paper, the efficiency model of Buck converters in the continuous conduction mode (CCM) was educed based on the average loss, and the calculation method of parameters for the efficiency model was given. For optimizing the operation efficiency of the paralleled system, the current distribution strategy based on the efficiency model was presented. The optimization object function of the Buck converter paralleled system was designed. The calculation method of module currents was deduced and the constraint condition of currents was analyzed. The adjust method of the paralleled module number was also given. Numerical simulations and experiments were done. It is validated that the efficiency of the paralleled system can be improved adopting the current distribution strategy based on efficiency optimization, which is compared with the system adopting the average current distribution.

• 出版日期2013