Universal electronic ballast for a family of fluorescent lamps

Details Universal electronic ballast for a family of fluorescent lamps Universal electronic ballast for a family of fluorescent lamps

1996-07-02

1999-03-02

Kinkead, Arnold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315DIG5, 315291, H05B 4136

Patent

active

058775960

ABSTRACT:
A universal electronic ballast self-accommodates to appropriately supply power to each one of a family of different fluorescent lamps, one at a time. The ballast comprises a circuit for supplying a.c. current to a lamp in such manner that current in the lamp varies as a function of an error voltage. A summing circuit is provided together with an error amplifier for amplifying the output of the summing circuit to produce the error voltage. A circuit produces a reference voltage that is supplied to the summing circuit. A current feedback circuit feeds back to the summing circuit a first signal that varies as a function of lamp current. A voltage feedback circuit feeds back to the summing circuit at least a second signal that varies as a function of lamp voltage in such manner as to realize a ballast current-voltage characteristic that intersects respective lamp current-voltage characteristics at desired operating power for each of the family of lamps.

REFERENCES:
patent: 4958108 (1990-09-01), Sorgensen
(Product Note), "Ballast IC Applications Information (IR2151): Pre-Heating a Lamp Filament Without a PTC Resistor," International Rectifier Corporation, Oct. 1994, three pages.
(Product Note), "L6569: High Voltage Half Bridge Driver with Oscillator," SGS-Thompson Microelectronics, Mar. 1996, six pages.
(Product Note), "Provisional Data Sheet on IR 2155 Self-Oscillating Power MOSFET/IGBT Gate Driver," International Rectifier, Aug., 1993, five pages, the IR2155 driver being functional similar to the IR2151 driver mentioned at p. 3 of the present specification.

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