High frequency fluorescent lamp exciter

Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...

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315307, 315DIG4, 315DIG7, H05B 3700

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active

050308874

ABSTRACT:
An electronic ballast for fluorescent lights is disclosed which includes a pulse width modulation driven inverter with feedback current controlling the pulse width. Ambient light feedback control is provided. The ballast includes a power factor correction pre-regulator for ensuring a high power factor. A pre-heat delay timer allows lamps cathodes to heat before applying driving voltage across the lamps.

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