Patent ID: 11101696

Abstract:
A transmitter has a transmitting resonant circuit, a transmitting circuit that supplies high-frequency power to the transmitting resonant circuit, and a demodulator. A receiver has a receiving resonant circuit; a receiving circuit that converts high-frequency power received by the resonant circuit into DC power; a load circuit that consumes the DC power; a resonance modulator that varies an input impedance, viewed toward the load circuit from the transmitting circuit, to switch whether an electromagnetic resonance condition is established; and a transmission-signal controller that converts a transmission signal into a variation pattern, representing a pattern of variation per predetermined time period of the input impedance, to control the resonance modulator. The demodulator detects a variable that varies with whether the electromagnetic resonance condition is established, and demodulates the transmission signal based on a pattern of variation per predetermined time period with respect to temporal variation of the variable.