| 摘要 |
A ballast for powering a high intensity discharge lamp includes at least one voltage divider for sampling a lamp operating condition and producing a sampled signal based on a scaling factor applied to the sampled lamp operating condition. The ballast also includes a controller for driving an inverter in response to the sampled signal. The scaling factor varies based on the mode of lamp operation and is substantially larger during lamp ignition than during steady state lamp operation.
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