As illustrated in FIG. 21, the wireless power transmitter 100 may include a transmitting coil 1111 configured with an LC resonant circuit to which a capacitor (C) is connected in series or parallel, and the wireless power receiver 200 may include a receiving coil 2911 to which a capacitor (C) is connected in series or parallel. It is based on a principle that power is transmitted to the wireless power receiver 200 due to a component in linkage with the receiving coil 2911 on a magnetic flux generated when the power conversion unit 111 applies AC power to the transmitting coil 1111. The transmitting coil 1111 and receiving coil 2911 is configured with a LC resonant circuit (or resonance tank) to which the capacitor (C) is connected in series or parallel, and sufficient power may be transmitted to the wireless power receiver 200 by adjusting an impedance using the LC resonant circuit.
A resonant circuit configured with the inductor (L) and capacitor (C) resonates while the L and C give and take energy to and from each other. Then, an inverter within the power conversion unit 111 performs the role of driving the LC resonant circuit at a resonant frequency or at a frequency higher than the resonant frequency in a steady state in which energy (power) is transmitted in a wireless manner.
