| 摘要 |
PURPOSE: To supply a proper power to an electrodeless discharge lamp at dark place lighting by performing a control so that a power sufficient for dark place starting is supplied to the electrodeless discharge lamp after the power is supplied to the electrodeless discharge lamp. CONSTITUTION: At the dark place lighting of an electrodeless discharge lamp 1, the reflected power of a matching circuit 4 is large, a detecting circuit 8A outputs a H-level voltage V8, the output voltage of a chopper circuit 5 is increased by a control circuit 9, and the voltage V between both ends of an induction coil 2 is increased to start the discharge lamp. After the starting, the detecting circuit 8A outputs the L-level voltage V8, the output voltage of the chopper circuit 5 is reduced, and the voltage between both ends of the coil 2 is reduced to keep the lighting of the discharge lamp 1. |
