Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1998-05-15
1999-10-26
Shingleton, Michael B
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315DIG7, 315DIG4, 315219, 315302, 315224, H05B 3702
Patent
active
059734558
ABSTRACT:
An electronic ballast for a gas discharge lamp includes an AC to DC converter for changing alternating current at power line voltage to direct current and an inverter powered by the converter and having a series resonant, direct coupled output coupled to the lamp. The inverter includes an AC switch having a diode bridge defining an AC diagonal and a DC diagonal and a transistor connected across the DC diagonal. The primary winding of a filament transformer is connected across the AC diagonal of the bridge and the transistor is coupled to the microprocessor for controlling current through the primary winding. The microprocessor is programmed to close the AC switch while the lamp is starting and to open the switch after the lamp is started, thereby cutting off the filaments from a source of power and reducing the power consumed by the ballast during normal operation. A resistor in series with the transistor is used to detect filament resistance and provide an indication of lamp type.
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Joseph D. Greenfield et al. "Using Microprocessors and Micro computers The 6800 Family" John Wiley & Sons,Inc. 1981 p. 10.
Bezdon Ronald J.
Crouse Kent E.
Keegan Patrick J.
Keith William L.
Mirskiy Grigoriy
Energy Savings, Inc.
Shingleton Michael B
Wille Paul F.
LandOfFree
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