Hubbell Limited

Joe Allen Nuckolls

Lily Li Lin

A discharge lamp operating circuit is connected to a source of alternating current (AC) voltage, and has a discharge lamp and a semi-resonant circuit connected to the source of alternating current voltage and in series with the lamp. A starting circuit for initiating operation of said discharge lamp is also connected in the circuit. The lamp switching maintains the series semi-resonant circuit in oscillation and the series semi-resonant circuit maintains the lamp in operation after operation has been initiated by the starting circuit. Highly efficient energy transfer between inductive and capacitive components of the system result in low loss and high power factor. A variable capacitance circuit is provided to allow use of the discharge lamp operating circuit with different line voltages, and to allow dimming.

Multi-voltage ballast and dimming circuits for a lamp drive voltage

An apparatus for dimming a discharge lamp is provided which comprises an electromagnetic regulator. The electromagnetic regulator has a primary winding connected to an AC power supply, a secondary winding connected to the lamp, and a tertiary winding. A capacitor is selectively connected to a tap on the tertiary winding via a switching device for dimming purposes.

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Etowah, NC, United States of America

Joe Allen Nuckolls