A current sharing control strategy of paralleled DC-DC converter based on simple model

For improving the dynamic characteristics of current adjusting in paralleled DC-DC converter modules, an optimal current control strategy based on ideal simple model was presented. The actual load of module was allocated according to reference output voltage of system and reference output current of paralleled module. The discrete model of paralleled module was founded and was simplified by linearizing power-exponent functions. The optimal current control was designed based on the simple model of paralleled module. The control error was modified according to the output error between actual paralleled module and simple model. In this paper, paralleled Buck converter system was the research target, the simple discrete model of Buck converter was founded and optimal current sharing control was obtained, digital PI was adopted to adjust control error. Simulation and experiment results validate that paralleled modules current can be controlled accurately and quickly.