Circuit for driving a gas discharge lamp load

Details Circuit for driving a gas discharge lamp load Circuit for driving a gas discharge lamp load

1991-05-28

1992-08-11

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315226, 315307, 315DIG7, H05B 3700

Patent

active

051382369

ABSTRACT:
A circuit (100) for driving fluorescent lamps (102, 104, 106) and including: a half-bridge inverter (112) receiving a unidirectional voltage and producing an alternating voltage, and having control inputs (156, 166); a series-resonant oscillator (126) coupled to the inverter output (116) for producing an alternating signal; and a non-saturating feedback transformer (146) having a primary winding (148) coupled in series between the inverter and the oscillator and secondary winding (150, 152) coupled respectively to the control inputs of the inverter. Since the feedback transformer is non-saturating it provides to the inverter control inputs a linear feedback signal from the inverter. This results in safe, stable, predictable and well-defined circuit operation, in which the possibility of the inverter transistors being destroyed by cross-conduction is substantially removed, and the amount of input voltage "ripple" present in the signal applied to the lamps is reduced.

REFERENCES:
patent: 4525649 (1985-06-01), Knoll et al.
patent: 5047690 (1991-09-01), Nilssen

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