Patent ID: 11139671

Abstract:
The present invention relates to a wireless charging system including a boost converter and a transmission coil structure at a transmission side. The wireless charging system includes a boost converter 150 configured to boost a first DC voltage input to an input terminal to a second DC voltage, a DC/AC inverter 160 configured to receive the boosted second DC voltage from the boost converter to convert the received second DC voltage to AC power, and a transmission coil structure 170 which is electrically connected to the DC/AC inverter to generate a temporally variable magnetic field for wireless supplying from the AC power. The first DC voltage and the second DC voltage of the boost converter 150 may be maintained to predetermined fixed values. The transmission coil structure 170 is formed by winding a wire on a magnetic sheet many times in a spiral shape and the winding coil has a circular shape having predetermined inner radius and outer radius, a pitch, and the turn number. Further, the transmission coil structure may include a plurality of coil structures and the plurality of coil structures may have a laminated structure by connecting wires having different cross-sectional areas in series.