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- Mizuno Toshiaki
- Department of Electronics, Nagoya Institute of Technology
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- Ishikawa Taro
- Department of Electronics, Nagoya Institute of Technology
Bibliographic Information
- Other Title
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- 降圧チョッパによるメタルハライドランプ用安定器
- 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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Abstract
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.
Journal
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- JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
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JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 66 (4), 121-124, 1982
The Illuminating Engineering Institute of Japan
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Details 詳細情報について
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- CRID
- 1390282679059602048
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- NII Article ID
- 130006761550
- 40004319348
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- NII Book ID
- AN00268860
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- ISSN
- 1349838X
- 21851506
- 00192341
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- NDL BIB ID
- 2449554
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed