| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent decrease of an installation space in a distribution switch board, and yet to restrain degradation of efficiency of a DC power distribution system as a whole due to conversion loss in a DC/DC conversion means. <P>SOLUTION: A DC/DC conversion part 6 is made operated by a control circuit 8a, if an input voltage V1 of the DC/DC conversion part 6 goes below a threshold voltage Vth. Further, if the input voltage V1 is beyond the threshold voltage Vth, the control circuit 8a stops operation of the DC/DC conversion part 6, and, when the DC/DC conversion part 6 is stopped, a load is fed with power through a bypass circuit 7. Therefore, the DC/DC conversion part 6 can be made operated only when it is needed, and stopped when it is not needed, so that efficiency degradation of the system as a whole due to conversion loss in the same 6 can be restrained. <P>COPYRIGHT: (C)2009,JPO&INPIT |
