VEHICLE CHARGING DEVICE

A vehicle charging device according to the present embodiment comprises: an amplitude detection unit that detects a magnitude of a grid voltage being inputted to the vehicle charging device; a frequency detection unit that detects a frequency of the grid voltage; a PLL (Phase Locked Loop) unit that monitors a phase of the grid voltage; and a gain selection unit that inputs a coefficient calculated using the magnitude and frequency of the grid voltage to the PLL unit, wherein the amplitude detection unit and the frequency detection unit detect a plurality of points at which the state of the grid voltage changes.