To secure safety for the installation and removal of the wire connecting part of a power supply line.
This power supply circuit comprises: a high-voltage battery B1; a low-voltage battery B2; a high-voltage power supply line 205; a low-voltage power supply line 206; and a DC/DC converter 200 that converts a high voltage at the high-voltage power supply line 205 side to a low voltage at the low-voltage power supply line 206 side. In the power supply circuit, a safety device 100 is inserted between the wire connecting parts of the power supply line. The safety device 100 comprises: a first terminal 101 at the battery side; a second terminal 102 at the DC/DC converter side; a first switch SW1 that is inserted above a conduction passage 103 that connects both the terminals; a low conductive member 104; a control circuit 106 that turns on the first switch SW1 by being fed with power via the first terminal; and a short-circuit conductor 120 that is detachably installed between both ends of the low-conductive member 104.
TAMAI YASUHIRO
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu