Power Factor Correction Electronic Ballast Research Articles

Improved Charge Pump Power Factor Correction Electronic Ballast Based on Class DE Inverter

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, <TEX>$THD_i$</TEX> 10.2% at full load and efficiency of more than 90%.

An improved charge pump power factor correction electronic ballast

An improved charge pump power factor correction (CPPFC) electronic ballast using the charge pump concept is proposed in this paper. Circuit derivation, principle of operation, and the conditions for achieving unity power factor are discussed. The proposed electronic ballast is implemented and tested with two 40 W fluorescent lamps. It is shown that 84% of overall efficiency and 1.6 of crest factor can be achieved with 200-V line input voltage. The measured line input current harmonics satisfy IEC 1000-3-2 Class C requirements. The lamp power variation range is automatically limited within /spl plusmn/15% for /spl plusmn/10% line input voltage variation without feedback control.

Current-source charge-pump power-factor-correction electronic ballast

Current source charge pump power factor correction (CS-CPPFC) electronic ballast is presented in this paper. Unity power factor condition and operation principle using the charge pump concept are derived and analyzed. Based on the steady state analysis, the design considerations are discussed in detail. It is shown that the power switch only deals with the resonant load current, which is the same as in the two-stage approach. This feature is very attractive, since the switch in the integrated single-stage power factor correction converter has to carry the current not only from input but also from the load. The developed current source charge pump electronic ballast can save one choke inductor, and has a potentially low cost. The current source charge pump electronic ballast was implemented and tested. It is shown that 0.992 power factor and 9.0% THD can be achieved for 85-watt fluorescent lamps.