Hybrid power supply for self-propelled sign cars

摘要

PPROBLEM TO BE SOLVED: To solve such a problem that it is disclosed to use a generator as a power supply for a display device, however, if the time for driving the display device is prolonged, the time for driving the generator is also prolonged, thereby increasing a discharge amount of exhaust gas. PSOLUTION: A hybrid power supply device for a self-propelled marker vehicle includes: each battery 14 mounted in a self-propelled marker vehicle and having each charger 13 that executes charging while being connected to each electrical outlet 11a of a commercial power supply in a road management office; a generator 15 mounted in the self-propelled marker vehicle and connected to the chargers; a DC/AC converter 21 for converting a DC current of the batteries into an AC current; a display device B for displaying information according to work states or the like by an AC voltage of the DC/AC converter; and an AC power supply switching control unit that detects an output voltage of the DC/AC converter and switches from the batteries to the generator when detecting the output voltage below a prescribed value. PCOPYRIGHT: (C)2010,JPO&INPIT