| 摘要 |
A dimming ballast apparatus comprises at least one power line dimming control input and at least one non-power-line dimming control input. In a preferred embodiment, the apparatus comprises a firing-angle-to-pulse-width-modulation converter responsive to the power line dimming control input, a voltage-to-pulse-width-modulation converter responsive to the non-power-line dimming control input, a low-pass filter responsive to the firing- angle-to-pulse-width-modulation converter and the voltage-to-pulse-width-modulation converter, and a dimming ballast circuit having a dim level command input responsive to the low-pass filter.
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