| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to supply more suitable power source power for various kinds of loads from an electric power unit on a vehicle and to suppress thickening of a wiring harness.SOLUTION: A main power source control box 10A and a sub-power source control box 10B are connected to each other via a trunk cable 22A, and the sub-power source control box 10B generates electric power which is fed to a load on the basis of electric power supplied from the trunk cable 22A. One or more DC/DC converters 33, 34 are built in the sub-power source control box 10B and convert a voltage. Kinds of voltages of electric power through the trunk cable 22A are reduced, and many kinds of voltages suitable for each load are generated by use of the DC/DC converters 33, 34. Since kinds of voltages are few, numbers of electric wires of the trunk cable 22A are reduced, whereby thickening can be prevented. Since a voltage higher than a voltage of a load is fed to the trunk cable 22A, electric currents are reduced, whereby an electric wire 22a can be thinned.SELECTED DRAWING: Figure 1 |
