模块化输入串联输出串联组合系统分布式均压控制策略

Input-series and output-series (ISOS) system is very suitable for high input-voltage and high output-voltage applications. Input voltage sharing and output voltage sharing of the constituent modules among the ISOS system must be ensured. This paper proposes a novel distributed voltage sharing control strategy featuring high modularity. In order to ensure proper sharing of input and output voltages, the input voltage sensing signal is added to Vref for each module, resulting in the positive output voltage gradient regulation characteristic of ISOS system, which can be improved by introducing an output voltage correction link. The proposed control strategy can effectively improve the modularity and reliability of ISOS system. An ISOS system prototype consisting of three two-transistor forward converter modules is tested in the lab and the experimental results verify the effectiveness of the proposed control strategy.