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