| 摘要 |
PCT No. PCT/US86/00285 Sec. 371 Date Sep. 17, 1987 Sec. 102(e) Date Sep. 17, 1987 PCT Filed Feb. 10, 1986 PCT Pub. No. WO87/04889 PCT Pub. Date Aug. 13, 1987.An improved ballast (10) that operates an ionic conduction lamp (40) such as a conventional phosphor coated fluorescent lamp. The ballast (10) comprises an ac/dc converter that converts an a-c power signal to a d-c power signal that drives a transistor tuned-collector oscillator (30). The oscillator is comprised of a high-frequency wave-shape generator (32) that in combination with a resonant tank circuit (36) produces a high-frequency signal that is equivalent to the resonant ionic frequency of the phosphor. When the lamp (40) is subjected to the high frequency, the phosphor is excited which causes a molecular movement that allows the lamp (40) to fluoresce and emit a fluorescent light. By using this lighting technique, the hot cathode of the lamp, which normally produces a thermionic emission, is used only as a frequency radiator. Therefore, if the cathode were to open, it would have no effect on the operation of the lamp. Thus, the useful life of the lamp is greatly increased. |
