Programmable universal lighting system

Details Programmable universal lighting system Programmable universal lighting system

1998-05-12

2000-03-21

Vu, David H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315291, 315DIG4, H05B 3702

Patent

active

060406615

ABSTRACT:
A programmable universal ballast can be programmed to accommodate a gas discharge lamp within a relatively wide wattage range. The ballast uses a microprocessor to store and execute various routines to start, run and dim a particular lamp type. A host computer produces customized routines which are downloaded into a microprocessor located within the ballast. These routines output signals to the MOSFET transistors of the inverter which effect dynamic and selective changes in the duty cycle and the frequency of the inverter signal. By selectively changing simultaneously both the frequency and duty cycle of the inverter signal, the energy spectrum of the resonance network is altered and circuit voltages and currents can be controlled to accurately match required lamp characteristics and operational requirements. The ballast may include an inductive element in parallel with the lamp allowing dimming to 1% of full light output. The use of this inductive element also results in a simplified and reliable lamp starting procedure and power factor correction.

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