Changing power input to a gas discharge lamp

Details Changing power input to a gas discharge lamp Changing power input to a gas discharge lamp

2009-02-25

2011-12-27

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S225000, C315S226000, C315S240000, C315S276000

Reexamination Certificate

active

08084953

ABSTRACT:
The present disclosure thus provides a technique for providing multi-level operation of ballast circuitry for discharge lamps. In one version, an auxiliary capacitance is switched in and out of circuit by a user controlled switch for lower the frequency of the voltage from the inverter to the transformer resulting in lower power output to the lamps. In another version, the auxiliary capacitance may be switched in and out of circuit by a user operated switch wherein the capacitance is connected to the secondary or output winding of the transformer for selectively reducing power to the lamps for reduced illumination. In other versions, auxiliary inductances are selectively switched in and out of circuit to alter the frequency of the primary voltage to the transformer. In another version, an auxiliary winding is selectively switched in and out of the secondary of the transformer for providing normal and reduced level power to the lamps. In another version, a variable direct current power supply is provided to the coupled inductors of the ballast circuitry for user control of the power supply to the ballast circuitry.

REFERENCES:
patent: 4100476 (1978-07-01), Ghiringhelli
patent: 4463286 (1984-07-01), Justice
patent: 5438243 (1995-08-01), Kong
patent: 7382099 (2008-06-01), Chen et al.

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