High-frequency auxiliary converter and control method

The invention relates to the technical field of electronic power, in particular to a high-frequency auxiliary converter and a control method, the high-frequency auxiliary converter comprises a control module and a plurality of parallel inversion modules, and each inversion module comprises a plurality of DCDC submodules and a DCAC submodule; the input ends of the DCDC sub-modules are connected in parallel and configured to access an input voltage, and the output ends of the DCAC sub-modules are connected in parallel to output a target voltage; in the inverter module, the output end of each DCDC sub-module is connected in parallel to the input end of the corresponding DCAC sub-module; each DCDC sub-module at least comprises an input relay, and each DCAC sub-module at least comprises an output relay; and the control module is respectively connected with each DCDC sub-module and each DCAC sub-module, and is used for controlling input and output voltages. According to the high-frequency auxiliary converter, the p