Low power unity power factor ballast

Details Low power unity power factor ballast Low power unity power factor ballast

1994-05-11

1995-11-28

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315204R, 315DIG7, H05B 4116

Patent

active

054711177

ABSTRACT:
An inverter circuit operating from line utilizes minimum, lower rating switches to operate at higher frequency, while maintaining substantially unity power factor and lower input current harmonics. The input rectified DC is transferred to a storage capacitor using a buck-boost regulator in which the current in inductor is always maintained discontinuous and proportional to the instantaneous input voltage. Filtering this input current will give substantially sinusoidal current at the input. The second switch in the buck-boost regulator and an additional third switch contributes to the necessary half bridge for an inverter. The inverter, which can be self oscillating or driven from a control circuitry, can give higher frequency, high voltage AC output with ability to control the load power hence provide for dimming, e.g. for a fluorescent lamp.

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