A Fluorescent Lamp Ballast Based On Current-boost Chopper Circuit

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  • 降圧チョッパによる蛍光ランプ用定電力形安定器
  • コウアツ チョッパ ニ ヨル ケイコウ ランプヨウ テイ デンリョクケイ アン

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Abstract

The ballast is composed of a rectifying unit, a filter capacitor, a chopper circuit and a control circuit. The chopper circuit has an inductor of a several mH, a high-power switching transistor and a semiconductor diode. The control circuit is a pulse-width-modulator with an error amplifier, and regulates the lamp current to maintain at a preset value.<BR>The ballast has a high efficacy only for vertically operating lamps. When a horizontally operating lamp is burned with the ballast, because of d. c. component of the lamp current, the light output decreases in the neighborhood of the anode and the total flux or the efficacy becomes small. But when the lamp is placed the cathode up and the anode down, the luminescence is almost homogeneous over the tube surface and high efficacy is obtained.<BR>The ballast of light weight is achieved, because no transformer is used and the control circuit is replaced by an IC. Moreover, the ballast is compatible for both 50 and 60 Hz of line frequency, and the change of the power or the light output is small with a fluctuation of the line voltage. But the lamp operating position must be limited in the vertical plane.

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