| To benefit the parallel current balancing, a current following digital control approach based on micro-processor is put forward. The main controller collect the output voltage and the output current in the real time, based on which, the desired output current for each DC-DC converter is worked out and transferred to the corresponding sub-controller by serial comunications. The sub-controller regulates the inductor current to make the output voltage to be the desired value is calculated and is controlled to a narrow range around it. The dynamic performance in case of the load changing, the starting period is analyzed and the strategy for current division. The design considerations are given. Taking a group of Buck converter as an example, the Simulink simulation results are obtained. Finally a buck DC-DC converter based on current following digital control has been implanted by ARM—LPC2138 and the experiments are made, the results of which show that the proposed approach is feasible, the analysis is correct and the proposed method is with fast responding speed.
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