| 摘要 |
An electronic ballasts for a gas discharge lamp. The ballast includes a variable frequency power generator, a tuned driver network, and a valley correction modulation system. The driver network has a first resonant frequency when the lamp is off and a second resonant frequency when the lamp is on. The power generator switches a rectified AC power line signal at a starting lamp frequency corresponding to the first resonant frequency for starting the lamp and at an operating lamp frequency corresponding to the second resonant frequency for operating the lamp. The valley correction modulation system compensates for the cyclic low voltages of the AC power line voltage cycle by adjusting the operating lamp frequency to be closer to the second resonant frequency.
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