Patent ID: 7327586

Claim:
A power supply unit for a lighting device in a vehicle comprising: a voltage output section for supplying a voltage to a plurality of loads within the lighting device in the vehicle, wherein the plurality of loads are connected in parallel with each other; a plurality of output side coils provided respectively corresponding to the plurality of loads, the plurality of output side coils being trans-connected with each other, the plurality of output side coils being connected with the corresponding loads in series, wherein an electric current to be supplied from the voltage output section to the corresponding load flows in each output side coil; a voltage rise detecting section for detecting that a rise in voltage at a node between the load and the output side coil corresponding to the load becomes higher than a predetermined value; and an output control section for selectively stopping an output of voltage from the voltage output section with respect to a load, the rise of the node voltage of which is detected, in the case where the rise in the node voltage of the load is detected by the voltage rise detecting section.