| 摘要 |
A circuit for supplying AC voltage and current to a gaseous discharge lamp upon the application of DC voltage and current, the circuit comprising: a transformer including a first and a second primary windings; a first capacitance means, coupled across the primary windings to define a resonant circuit; a start-up current source coupled to a drive terminal; first and second transistors coupled to the drive terminal; at least one drive winding coupled on one end to the drive terminal and coupled on the other end to the base of one of the transistors; and first and second current-blocking devices, in one embodiment a diode and in another embodiment a transistor, each current-blocking device configured so as to block a current from flowing into the emitter element of one of the transistors. Additionally, the circuit comprises a means for establishing a constant current flow between the base terminals of the transistors, sufficient to maintain the circuit in an oscillating mode, the means having a linear inductor, a resistor and at least one diode. In another embodiment, the circuit has one drive winding coupled to the base element of the first transistor switching means, and a parallel combination of a second capacitance means and a second resistor means coupled to the base element of the second tansistor switching means.
|
