A first port configured to supply power to the electric vehicle; a second port configured to receive power converted by the transformer connected to the power line; and a second port configured to receive power converted by the transformer connected to the power line, A switching unit that switches between an open state and a closed state between the first port and the second port; and a switching unit that is electrically connected to the first port and the second port when the load amount information of the transformer is received and the load amount corresponding to the load information is larger than the reference load amount And a control unit for controlling the blocking unit.
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