Solid state chopper ballast for gaseous discharge lamps

Details Solid state chopper ballast for gaseous discharge lamps Solid state chopper ballast for gaseous discharge lamps

H - Electricity

05

B

315/55

H05B 41/26 (2006.01) H05B 41/28 (2006.01) H02M 1/00 (2006.01)

Patent

CA 1042500

Abstract of the Invention A single phase, high frequency, transistor or gate turn- off thyristor chopper ballast circuit especially suited for mercury vapor lamps preferably operates on unfiltered full wave rectified line voltage and electronically shapes the lamp current and therefore the line current to obtain a high power factor. The ballast circuit is lightweight with low volume due to elimination of large low frequency energy storage, filtering, and transformer components. The forced, high frequency ripple lamp current waveshape, achieved by comparison of the sensed current with an appropriate refer- ence signal, provides for good regulation, an initially high starting current to eliminate glow-to-arc mode, automatic sweeping of the chopping frequency to avoid acoustic resonance supply voltage for improved reignition characteristics.

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