降圧チョッパによるメタルハライドランプ用安定器

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書誌事項

タイトル別名
  • A New Metal Halide Lamp Ballast Based on Current-boost Chopper Circuit
  • コウアツ チョッパ ニヨル メタル ハライド ランプヨウ アンテイキ

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抄録

The metal halide lamp ballast of light weight and high efficacy is achieved by use of transistor chopper.<BR>The ballast can be divided into three units, a chopper circuit, a control unit and a rectification unit. The chopper circuit is composed of a high-power transistor, a silicon diode and an inductor of several mH. Main components of the control unit are an IC and a medium-power transistor. The IC has functions of a reference voltage generator, a clock pulse generator, an error amplifier and a pulse-width-modulator. And medium-power transistor amplifies the output of the IC to drive the high-power transistor. The rectification unit is consist of four sillicon diodes and a capacitor of several tens μF.<BR>When a discharge lamp is connecned to the chopper circuit, the lamp current tends to be increased rapidly or be extinguished because of the negative resistance or constant voltage characteristics of the lamp.<BR>Comparing the input current of chopper circuit with reference value, the control unit adjusts automatically the conducting time of the high-power transistor to stabilize the lamp current.<BR>In HID lamps, instability caused by accoustic resonance occurs at specific frequncy when h.f. current flows in a lamp. Therefore switching frequency of the chopper must be chosen to be apart from the frequency at which the instability occurs. In practice, a 100 watt metal halide lamp is operated by the ballast with switching frequency in the range of 13-18 kHz.

収録刊行物

  • 照明学会誌

    照明学会誌 66 (4), 121-124, 1982

    一般社団法人 照明学会

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