Wireless power transfer device for automatic logistics systems

A wireless power transfer device for transferring power to a plurality of transfer carts moving along a rail by magnetic induction in a non-contact manner, the wireless power transfer device comprising:

• a feeder line installed along the rail and configured as a closed loop;
• a feeder track configured such that a plurality of feeder loops are sequentially installed along the rail;
• an inverter supplying AC current to each of the feeder lines;
• an inverter cradle provided on a side of the rail for mounting the inverter;
• the feeder line being connected to the inverter cradle and the inverter being mounted on the inverter cradle and
• a plurality of connection units connecting input and output terminals of the inverter to the inverter cradle so that the inverter is detachable;
• a transfer cart for replacing the inverter;
• and
• a central controller remotely controlling the entire transfer cart and the entire inverter and monitoring various data,
• wherein, when one of the plurality of inverters fails, the central controller detects the failure and commands the transfer cart to move to a position of the failed inverter, to detach the failed inverter from the inverter cradle and move the failed inverter to an inverter storage, and to install a new inverter stored in an inverter storage onto the inverter cradle of the failed inverter and connect a connection unit, thereby automatically replacing the failed inverter with the new inverter.