| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply adapter for an onboard equipment capable of easily using a commercial ACC device, in a large vehicle such as a truck that uses an onboard power supply of DC24V. <P>SOLUTION: A DC/DC converter 22, with an input end connected to a first input terminal 211, steps down a DC input voltage Vin which is supplied through the first input terminal 211, and supplies a DC voltage V1, that has been stepped down, to a first output terminal 251. A first switch circuit 23 comprises a first switch drive circuit 231 and a first switch 232. The input end of the first switch drive circuit 231 is connected to a second input terminal 222. The first switch 232 is controlled by the first switch drive circuit 231, and is inserted between the output end of the DC/DC converter 22 and a second output terminal 252. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
