| 摘要 |
PROBLEM TO BE SOLVED: To provide a power transmission circuit which can transmit power by utilizing efficiently buffer ICs, so as to reduce the peak current of their power supply, and by using a small number of buffer ICs. SOLUTION: The output terminal of an oscillation circuit 4 is connected with a terminal 10b of a resonance circuit 10, via buffers 6e-6h of a buffer IC 6 and buffers 7e-7h of a buffer IC 7. The output terminal of an inverter gate 5a for outputting the reverse-phase signal of the oscillation signal fed from the oscillation circuit 4 is connected with a terminal 10a of the resonance circuit 10, via buffers 6a-6d of the buffer IC 6 and buffers 7a-7d of the buffer IC 7. Then, a power is transmitted by magnetic signals to the control circuit of an IC card coupled magnetically to the resonance circuit 10 via the transmission and reception circuit of the IC card. |
