Electronic power factor correction for ballasts

Details Electronic power factor correction for ballasts Electronic power factor correction for ballasts

1989-07-10

1991-10-15

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315209R, 315200R, 315283, 315DIG5, H05B 4100

Patent

active

050577492

ABSTRACT:
In an inverter-type fluorescent lamp ballast adapted to be powered from a DC supply voltage consisting of a substantially non-filtered full-wave-rectified 60 Hz power line voltage, the inverter's output is a 120 Hz magnitude-modulated squarewave voltage of frequency controllable about 30 kHz. The magnitude-modulated squarewave voltage is applied across a series-connected high-Q L-C circuit. The fluorescent lamp is connected in parallel with the tank capacitor of this L-C circuit. The magnitude of the current drawn by the fluorescent lamp is a sensitive function of the frequency of the squarewave voltage and is controlled by correspondingly controlling the frequency of this squarewave voltage. By controlling the frequency of the squarewave voltage in synchronism with the 120 Hz DC ripple frequency and in such manner as to cause the magnitude of the lamp current to be roughly proportional to the instantaneous magnitude of the unfiltered DC supply voltage, the line current drawn by the electronic ballast from the power line will have a high power factor and a relatively low harmonic distortion.

REFERENCES:
patent: Re31758 (1984-12-01), Nilssen
patent: 3681654 (1972-08-01), Quinn
patent: 4513364 (1985-04-01), Nilssen
patent: 4644459 (1987-02-01), Nilssen
patent: 4727470 (1988-02-01), Nilssen
patent: 4851739 (1989-07-01), Nilssen
patent: 4862040 (1989-08-01), Nilssen
patent: 5001400 (1991-03-01), Nilssen

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