International journal of advanced smart convergence

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Improved Charge Pump Power Factor Correction Electronic Ballast Based on Class DE Inverter

  • Thongkullaphat, Sarayoot (Department of Electrical Engineering, Faculty of Engineering and Architecture Rajamangala University of Technology Suvarnabhumi)
  • Received : 2015.01.23
  • Accepted : 2015.03.22
  • Published : 2015.05.30
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Abstract

This paper proposes fluorescent electronic ballast with high power factor and low line input current harmonics. The system performance can be improved by a charged pump circuit. Details of design and circuit operation are described. The proposed electronic ballast is modified from single-stage half bridge class D electronic ballast by adding capacitor parallel with each power switch and setting the circuit parameter to operate under class DE inverter condition. By using this proposed method the DC bus voltage can be reduced around by 50% compare with conventional class D inverter circuit. Because the power switches are operated at zero voltage switching condition and low dv/dt of class DE switching. The experimental results show that the proper frequency of the prototype is around 50 kHz with input power factor of 0.982, $THD_i$ 10.2% at full load and efficiency of more than 90%.

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References

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