| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply circuit enabling a load operation even after a connection line is electrically opened and to provide a portable telephone system. <P>SOLUTION: The power supply circuit includes: a first voltage conversion portion 33 which is arranged between a power supply portion 31 and a first load 32 on a first connection line L1 and converts voltage supplied from the power supply portion 31 into voltage suitable for the first load 32; an opening portion 34 which is arranged between the power supply portion 31 and the first voltage conversion portion 33 on the first connection line L1 and electrically opens the first connection line L1 when current of a prescribed amount or more flows; a second connection line L2 connected to the first connection line L1 between the opening portion 34 and the first voltage conversion portion 33; an opening determining portion 35 which is connected to the second connection line L2 and determines whether the first connection line L1 is electrically opened by the opening portion 34 or not; and a control portion 36 connecting the first connection line L1 and the second connection line L2 between the power supply portion 31 and the opening portion 34 when the opening determining portion 35 determines that the first connection line L1 is opened. <P>COPYRIGHT: (C)2012,JPO&INPIT |
