| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the power consumption of a portable terminal by securing connection among a power coil, the DC voltage generated by a DC power circuit connected to the power coil and the DC voltage supplied from a contact via a diode and then supplying the electric power to a load from the coil or the contact. SOLUTION: A power transmission circuit 115 drives a power transmission coil 111 and sends the power to a power reception coil 121 connected to a card via transformer. Thus, a power circuit 124 generates the DC voltage. The data are transferred in both directions as the noncontact serial data among a read/write control circuit 116, a reader data transmission/reception coil 112, a card transmission/reception coil 122 and a transmission/reception control circuit 125. Then a contact type power supply terminal 123 is connected to a card internal circuit (load) via a diode 128 to supply the power to a card contact terminal 123 from a battery 114 contained in a read/write device via contact terminal 113 of the read/write device.</p> |
