Auxiliary power supply with information transmission function for modular converter

The invention discloses an auxiliary power supply with an information transmission function for a modular converter, which belongs to the technical field of power electronics. An information transmission path is combined with an energy circulation path of the sub-module auxiliary power supply, and the energy transmission path of the AC power supply is utilized to complete signal transmission, so that power information fusion is realized, the number of communication optical fibers is reduced, the system integration degree is improved, and the system complexity and cost are reduced; on the basis, at least two sets of AC power supplies are adopted to supply power to the sub-module at the same time based on the idea of centralized power supply, when one set of AC power supply is cut off due to faults, other AC power supplies can still provide enough electric energy for the sub-module, normal work of the sub-module is guaranteed, and the reliability of the auxiliary power supply is improved. 本发明公开了一种用于模块化变换器的具备信息传