| 摘要 |
A ballast circuit having a series inductor (L7) and capacitor (C10) in which the lamp load (LL) is connected in parallel with the capacitor. During pre-ignition of the lamp load, the driving signal supplied by an inventor generating a substantially rectangular signal includes a fundamental frequency f1. The resonant frequency fo of the series connected L-C circuit is at least 2 times greater than the fundamental frequency f1 but less than the third harmonic of the driving signal. <IMAGE>
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