| 摘要 |
<p>PURPOSE:To simplify an installing work in installation of electric equipment which requires the first power source to be fed only when a key switch provided in a vehicle is turned on and the second power source to be always fed, in a vehicle having a battery with output voltage higher than the voltage suitable for the first and the second power sources. CONSTITUTION:A DC-DC converter 11 which lowers battery voltage fed from an on-vehicle battery 22 via a connector 30 and a key switch arranged in a vehicle is arranged. The output of the DC-DC converter 11 is connected to the first terminal Ta serving as a key-on power source output terminal. On the other hand, a secondary battery 12, which can be charged by the output of the DC-DC converter 11, is arranged. The output of the secondary battery 12 is connected to the second terminal Tb serving as a normal power source output terminal.</p> |
