Voltage replenisher

The embodiment of the invention discloses a voltage replenisher. The voltage replenisher comprises a line access module, an electric energy conversion module, a power collection module and a logic control module, and the line access module comprises two access ends which are respectively accessed to any two phases in the three-phase live display to obtain an alternating current of a first voltage; the electric energy conversion module is connected with the line access module, and is used for performing electric energy conversion on the alternating current of the first voltage to obtain direct current of a second voltage; the power collection module is connected with the electric energy conversion module, and is used for receiving the direct current of the second voltage and storing electric energy so as to supply power to the logic control module; and the logic control module is used for receiving power supplied by the power collection module so as to perform logic function control. By adopting the technical