| 摘要 |
A power-supply circuit 1 includes a booster circuit 4, a bypass switch 15, and a controlling circuit 13. The controlling circuit 13 controls the driving of a boosting switching element 6 in a manner such that, at a predetermined timing during an ordinary period, the bypass switch 15 is put and maintained in the off state and then such that an output voltage of the booster circuit 4 becomes equal to an input voltage of the booster circuit 4 before the predetermined timing. While the controlling circuit 13 is controlling the driving of the boosting switching element 6 in a manner such that the output voltage of the booster circuit 4 becomes equal to the input voltage of the booster circuit 4 before the predetermined timing, the controlling circuit 13 detects, as a bypass current flowing through the bypass switch 15, a current detected by a current detecting circuit 14. |
