| 摘要 |
A ballast circuit for a high intensity discharge lamp (24) includes a boost converter (16), a boost controller (36), responsive to the boosted dc output voltage, for driving the boost converter (16) to maintain the boosted output voltage at a predetermined level; a buck converter (18); and a buck controll er (38) for driving the buck converter to operate the lamp in a transition mode and maintaining the reduced dc output voltage at a preselected level for operating the lamp in a steady mode.
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