Invention Grant
US08344646B2 Multiple voltage ballast 有权
多电压镇流器

Multiple voltage ballast
Abstract:
A ballast and method for operating a ballast includes a switch or other circuit for connecting and disconnecting a voltage multiplier to a rectifier circuit. A control circuit for controlling the switch senses an input voltage and connects the voltage multiplier to the rectifier circuit when an input voltage falls below a selected voltage level.
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