| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a charging circuit and a portable device capable of improving power utilization efficiency of an internal circuit. <P>SOLUTION: A charging circuit 130 is a circuit for supplying DC power supplied from an external power source 200 to a secondary battery 120 and an internal circuit 110 of a portable device 100 incorporating or detachably mounted with the secondary battery 120, and comprises a DC-DC converter 132 installed on an electrical path between the external power source 200 and the secondary battery 120 for outputting a prescribed voltage to the secondary battery 120, and a DC-DC converter 133 installed on an electrical path between the external power source 200 and the internal circuit 110 for outputting a voltage different from the output voltage of the DC-DC converter 132 to the internal circuit 110. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
