Power supply

The utility model discloses a power supply which comprises a power cabinet. Multiple independent power supply modules are horizontally or vertically arranged in the power cabinet, wherein each power supply module is provided with a primary output busbar group, each primary output busbar group comprises a positive primary busbar and a negative primary busbar, each column of power supply modules is provided with a positive secondary busbar and a negative secondary busbar which are respectively connected with the positive primary busbar and the negative primary busbar of each power supply module, each column of positive secondary busbars is electrically connected with a final positive output busbar, and each column of negative secondary busbars is electrically connected with a final negative output busbar. According to the utility model, multiple independent power supply modules are combined to form the whole power supply in an N+1 mode; when a fault occurs, the power supply is not halted, wherein the fault modu