POWER TRANSMISSION SYSTEM AND POWER TRANSMISSION DEVICE USED FOR POWER TRANSMISSION SYSTEM

摘要

A power transmission device wirelessly transmits power to a power receiving device rectifying a voltage received and supplying the voltage to a load circuit. The power transmission device includes a power transmitter that makes capacitance or electromagnetic coupling to the power receiver and transmits electric power to the power receiver, a power supply unit that generates electric power to be transmitted to the power receiving device and supplies the electric power to the power transmitter, a load impedance detector that detects a load impedance of the power receiving device based on an electric signal detected in the power transmission device, and a controller that controls the electric power to be generated by the power supply unit such that an output voltage of the rectifying circuit of the power receiving device is equal to or lower than a predetermined voltage based on a detection result of the load impedance detector.

主权项

1. A power transmission device that wirelessly transmits electric power to a power receiving device having a power receiver with a rectifying circuit that supplies a voltage to a load circuit, the power transmission device comprising:
a power supply unit that generates electric power; a power transmitter that transmits the electric power to the power receiver by capacitance coupling or electromagnetic coupling; a load impedance detector configured to detect a load impedance of the power receiving device based on an electric signal detected in the power transmission device; and a controller configured to control the power supply unit to generate the electric power such that the voltage supplied by the rectifying circuit to the load circuit is equal to or less than a predetermined voltage based on a signal output by the load impedance detector.