| 摘要 |
A lighting control system provides variable arc current to one or more fluorescent gas discharge lamps (30) and provides a heating voltage to the lamp electrodes. The system includes a start-up circuit which includes circuitry for providing a starting voltage to an output power conditioning circuit (28). The latter drives a switching unit to control the application of DC power to the fluorescent gas discharge lamps and to provide an operating voltage to an input power factor correction circuit (18). The input power factor correction circuit (18) boosts the converted DC power and the operating voltage. The start-up circuit (28) includes a plurality of voltage doubling rectifier circuits (D103-D106) and a plurality of zener diodes (Z101, Z102) which receive the operating voltage and are electrically connected to the input power factor correction circuit (18) and the output power conditioning unit (28) so as to provide a regulated bias voltage supply to the output power conditioning unit and to the input power factor correction circuit. |
