| 摘要 |
PROBLEM TO BE SOLVED: To transmit power efficiently by letting a power carrier frequency control circuit change the power carrier frequency and by controlling it so that the output voltage inside the body can be maximized, when a power transmitting circuit for transmitting the power carrier is provided outside the body and it is linked to a power receiving circuit. SOLUTION: In a power carrier frequency control circuit 8, a CPU 23 stores a received output voltage value into a memory 24 and controls the power carrier frequency in such a way as to increase it, for example, a bit higher than the current frequency. When the output voltage value becomes equal to the voltage value stored in the memory, the control is ended. Conversely, when the output voltage value based on the received voltage is lower than the previously stored voltage value, the power carrier frequency is a bit lowered below the current frequency to perform the control of comparing the received output voltage value with the stored one. This way, the power carrier frequency is controlled so that the received voltage of the power receiving circuit 1 can always be maximized.
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