| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power source circuit capable of connecting of plural types of batteries having different rated output voltages to reduce number of component types (components) and man-hours to be managed. <P>SOLUTION: An on-vehicle shared power source circuit 16 comprises an input unit to which one of plural types of batteries with mutually different rated output voltages is connected and an output unit having a constant-voltage circuit to which an on-vehicle apparatus body which makes up an on-vehicle apparatus is connected. The on-vehicle shared power source circuit 16 further comprises a power conversion circuit 23 which supplies, when a battery with a lowest rated output voltage is connected, supply a voltage from the battery to the constant-voltage circuit as it is, and supplies, when a battery with a higher rated output voltage is connected, power to the constant-voltage circuit after performing power conversion so that the power should not surpass power durability of a transistor. <P>COPYRIGHT: (C)2012,JPO&INPIT |
