| 摘要 |
The title device comprises a discharge means including a discharge lamp (15) adapted to start and turn with a voltage applied from a power source (10) through a rectifier (12), an operational amplifier (20) and a pulse width control circuit (21) cooperate to step up or down said rectified voltage to generate a high voltage enough to start the discharge lamp, and a choke coil (14) which superposes a predetermined pulsating voltage determined by the inductance characteristics on the supply voltage; and a turn-on means including a resistor (16) for detecting the electric discharge current of said discharge lamp (15), and the operational amplifier (20) and the pulse width control circuit (21) which cooperate to step down said supply voltage after the discharge lamp (15) started discharging. |
