DC LIGHTING DEVICE FOR FLUORESCENT LAMP

PROBLEM TO BE SOLVED: To easily separate a high tension DC power source and a constant current DC power source by connecting a starter for starting to one end of a filament of a fluorescent lamp in series, and connecting a constant current DC power source through a first diode for reverse blocking and a high tension DC power source through a resistor for keeping high voltage, to the other end in series. SOLUTION: When a fluorescent lamp starter for starting is switched ON, the electric current from a constant current DC power source heats a filament of a fluorescent lamp through a first diode 2 for reverse blocking. On the other hand, as the high tension DC power source has a resistor 4 for keeping high voltage, high voltage can be kept. When the fluorescent lamp starter 1 for starting is switched OFF, the electric current form the high tension DC power source 5 flows in the fluorescent lamp as it is blocked by a second diode 2 for reverse blocking, and high voltage is added to both ends of the fluorescent lamp approximately as it is. As the voltage at both ends of the fluorescent lamp is lowered immediately after the lighting, the electric current from the constant DC power source 3 lights the fluorescent lamp through the first diode 2 for reverse blocking.