| 摘要 |
PURPOSE:To reduce loss when a transistor is turned on. CONSTITUTION:A parallel circuit of a DC power supply 1, inductor 2 and a capacitor 3 and a closed circuit containing a transistor 9 are provided. A series circuit 5, 7 containing an electric discharge lamp 5 and a feedback transformer 7 is connected to both ends of the parallel circuits 2, 3. A capacitor 6 is connected in parallel to the electric discharge lamp 5. A closed circuit, containing a secondary side of the feedback transformer 7, inductor 12, capacitor 13 and base emitter connected of the transistor 9, is provided. A rectifier 10, connected in reverse parallel to the base emitter connection of the transistor 9, and a resistor 11, inserted in series to the rectifier 10, are provided. A capacitor 14 is connected in parallel to the base emitter connection of the transistor 9. By this constitution, a vibration curve of base emitter voltage of the transistor 9 is relaxed by parallelly connecting the capacitor 14, and the base emitter voltage is prevented from exceeding on-voltage of the transistor 9 when it is turned on. |
