ELECTRIC POWER TRANSMITTING DEVICE, ELECTRIC POWER RECEIVING DEVICE, AND POWER SUPPLY METHOD USING ELECTRIC POWER TRANSMITTING AND RECEIVING DEVICES

摘要

In electric power supply through wireless signals, electric power is supplied efficiently, even when distance fluctuation is caused between an electric power transmitting device and an electric power receiving device. Even when distance fluctuation is caused between the electric power transmitting device for supplying electric power with the use of wireless signals and the electric power receiving device for receiving electric power supplied from the electric power transmitting device, the Q value of the electric power transmitting device is adjusted to optimize the transmission efficiency. The impedance of a resonance circuit of the electric power transmitting device is fluctuated at a constant frequency, the resulting reflected wave is detected as a response signal by the electric power transmitting device, and the Q value of the electric power transmitting device is adjusted to optimize the transmission efficiency.

主权项

1. An electric power transmitting device comprising:
an electric power radiation circuit comprising an antenna and a variable resistive element; and a modulated signal detection circuit configured to change a resistance value of the variable resistive element in order to change a Q value of the electric power radiation circuit.