| 摘要 |
To efficiently control the output illumination level of a gas discharge lighting arrangement having four or more gas discharge lamps (13,14,15,16) with multiple ballasts (10,12), load side control of each ballast (10,12) is provided by a timed interval controlled impedance (62,64), serially coupled between the particular ballast (10,12) and its associated lamps (13,14;15,16). A circulating inductor (66,68), coupled in parallel with each controlled impedance (62,64), provides a current path between the power source (42,44) and the lamps (13,14,15,16) at least during that portion of the AC waveform when the controlled impedances (62,64) are non-conducting. |
