| 摘要 |
A ballast circuit for a fluorescent bulb comprises a voltage quadrupler circuit in series with a ballast resistor and the bulb. The quadrupler circuit comprises a voltage doubler circuit whose output voltage is doubled by a second voltage doubler circuit. The first voltage doubler circuit includes a first pair of series capacitors capable of supplying lamp current at operating voltage. The second voltage doubler circuit comprises a pair of series capacitors for providing full quadrupler voltage for no-load triggering but negligible effect under load and have a capacitance that is much smaller than the capacitance of the first doubler capacitors. A variable resistance in series with the first voltage doubler circuit may function as a dimmer control.
|
