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ELECTRONIC BALLAST WITH LAMP CURRENT VALLEY-FILL POWER FACTOR CORRECTION
ELECTRONIC BALLAST WITH LAMP CURRENT VALLEY-FILL POWER FACTOR CORRECTION
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机译:电子镇流器,带有灌流谷值功率因数校正
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摘要
An electronic ballast (10) for powering at least one gas discharge lamp (30) includes a rectifier circuit (100), a line blocking rectifier (220), a bulk capacitor (240), an inverter (300), an output circuit (400), and a charging circuit (500). Charging circuit (500) is coupled between the output circuit (400) and the bulk capacitor (240) and provides operating current to the bulk capacitor (240). Charging circuit (500) also protects lamp life by preventing excessive flow of DC current in the lamp (30) following application of AC power to the ballast (10). In a preferred embodiment, charging circuit (500) includes a DC blocking capacitor (510), a lamp current blocking rectifier (530), and a charging rectifier (540).
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