| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radio unit with a charging function which is simplified in comparison with the prior art and inexpensively and surely performs voice communication when charging a secondary battery. <P>SOLUTION: A commercial power supply noise is extracted using a reception demodulating means 3, a noise filter 12 and a noise amplifier 13 in a transmission operating state of charging a secondary battery 10, charging of the secondary battery 10 is stopped by turning an FET 15 into non-conducted state only when a noise component exists, and the secondary battery 10 is charged by turning the FET 15 into conducted state in other cases. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
