A wireless power transmission device is disclosed. The wireless power transmission device, which is a medium-power wireless power transmission device that transmits power to a low-power wireless power reception device or a medium-power wireless power reception device, includes: a power conversion unit that converts electrical energy to a power signal; and a communications and control unit that communicates with the wireless power reception device and controls power transfer, the power conversion unit including: an inverter that converts DC input to an AC waveform that drives a resonant circuit; a primary coil that creates a magnetic field; and a current sensor that monitors the current in the primary coil, wherein the inverter operates in a full-bridge mode that drives a plurality of bridges or in a half-bridge mode that drives a single bridge.