| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that it is difficult to light a required number of pieces in series and that a plurality of power units become necessary when the lighting of a plurality of LEDs of large power and requiring relatively high voltage for lighting are requested for the light source of a headlight, etc., which is easy to cause dispersion of voltage among individual devices, etc. SOLUTION: By materializing a power unit 1 which can get double output potential and output voltage with one control circuit by getting stepped-up potential on positive voltage side and stepped-up potential on negative voltage side, on the basis of the output from one control circuit 4, and driving LEDs 5 in floating between the positive electrode on the positive voltage side and the negative electrode on negative voltage side, it becomes possible to light a required number of LEDs 5 in series, for example, it enables conventional operation where all go out even at wire breaking of, for example, one piece of LED. COPYRIGHT: (C)2008,JPO&INPIT |
