Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Digital Control Methods of Two-Stage Electronic Ballast for Metal Halide Lamps with a ZVS-QSW Converter

  • Wang, Yijie (Dept. of Electrical and Electronics Engineering, Harbin Institute of Technology) ;
  • Zhang, Xiangjun (Dept. of Electrical and Electronics Engineering, Harbin Institute of Technology) ;
  • Wang, Wei (Dept. of Electrical and Electronics Engineering, Harbin Institute of Technology) ;
  • Xu, Dianguo (Dept. of Electrical and Electronics Engineering, Harbin Institute of Technology)
  • Received : 2010.04.02
  • Published : 2010.09.20
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Abstract

This paper presents a new kind of digital control metal halide lamp electronic ballast. A zero-voltage-switch quasi-square-wave (ZVS-QSW) dual Buck converter is adopted here. In this paper, a digital control method is proposed to achieve ZVS for the converter. This ZVS can be realized during the whole working condition. Single-cycle-peak-current control is proposed to solve the problem of excessive inductor current during a low-frequency reversal transient. Power loop control is also realized and its consistency for different lamps is good. An AVR special microcontroller for a HID ballast is used to raise the control performance, and the low-frequency square-wave control method is adopted to avoid acoustic resonance. A 70W prototype was built in the laboratory. Experimental results show that the electronic ballast works reliably. Furthermore, the efficiency of the ballast can be higher than 92%.

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References

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