| 摘要 |
The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be supplied to the internal circuit is obtained in controlling impedance based on the detected induced power or the voltage corresponding to the induced power. <IMAGE> |
