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A digital current sharing method for DC power supply systems is proposed to address the current sharing problem of power modules in spacecraft high-power DC power supply systems. This method uses the power supply main control software as the current sharing core, and outputs each DC power module in parallel. It interacts with each DC power module through Ethernet to collect the output current of each DC power supply, and adjusts the output voltage of the DC power supply through the current sharing algorithm to achieve the goal of current sharing. This method is based on the existing DC power supply and designs a high-power DC power supply parallel hardware circuit, which includes input control unit, remote compensation circuit, and output control unit. On the software side, a power supply and distribution main control software is designed, including current sharing control function, power supply and distribution process function, and power module monitoring function.Through actual hardware environment experiments, it has been shown that this method has high current sharing accuracy, fast response speed, and strong fault control ability, and has high practical value in the field of aerospace power supply.