| 摘要 |
A lamp ballast is disclosed which includes a main winding, and an auxiliary winding connected in series with the main winding. The auxiliary winding is wound concentrically with the main winding and with substantially fewer turns than it. The pitch (space between two adjacent turns) of the auxiliary winding is much higher than that of the main winding so that the turns of the auxiliary winding are spaced over the entire length of the main winding. When a voltage pulse of comparatively low amplitude is applied across the auxiliary winding by a conventional electronic lamp starter, a substantially higher amplitude pulse, which is sufficient to ignite a sodium lamp appears across the main winding, by reason of the improved transformer action between the two windings. Thereafter, the ballast provides sufficient support to the lamp to keep it on.
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