Low harmonic compact fluorescent lamp ballast

Details Low harmonic compact fluorescent lamp ballast Low harmonic compact fluorescent lamp ballast

1991-11-22

1993-06-29

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315205, 315DIG7, 315307, H05B 3702

Patent

active

052237672

ABSTRACT:
A high frequency electronic ballast for a lamp (20) includes an LC filter (5) and a voltage doubler circuit (8) coupling AC input terminals (1, 2) to DC input terminals (13, 14) of a half bridge DC/AC converter circuit (15). One end of the lamp is coupled to the capacitors (16, 17) of the voltage doubler circuit via a coupling capacitor (21) and the voltage doubler diodes (11, 12) and the other end of the lamp is coupled via an LC circuit (24, 25 and 26) to a junction point (22) between first and second switching transistors (18, 19) of the half bridge circuit. A capacitor including the lamp and the LC circuit so that the half bridge circuit will oscillate at a high frequency. Energy is fed back to the voltage doubler capacitors via the coupling capacitor and the LC circuit to maintain the capacitor voltage above the peak of the AC supply voltage and thereby provide a circuit with a high power factor and low harmonic line current.

REFERENCES:
patent: 4935672 (1990-06-01), Lanmers
patent: 4952842 (1990-08-01), Bolhuis
patent: 4965493 (1990-10-01), Van Meurs
patent: 4994717 (1991-02-01), Moon
patent: 5057749 (1991-10-01), Nilssen
patent: 5117161 (1992-05-01), Avrahami

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