Single-stage CCM PFC electronic ballast

Abstract

This paper presents a single-stage electronic ballast with continuous-current-mode (CCM) power factor correction (PFC), which is a combination of a boost-type PFC network and a DC/AC inverter to allow CCM operation for the PFC inductor in the boost-type PFC network. Among the PFC techniques proposed in recent years, in general, the discontinuous-current-mode single-stage PFC electronic ballasts have such drawbacks as high electromagnetic interference, high current stress, and high switching and conduction losses. The PFC capacitor of the developed boost-type PFC network can help the PFC inductor to achieve CCM, thus shaping the input current of the proposed electronic ballast to achieve high power factor (PF). Finally, a 36 W rated power electronic ballast prototype circuit is designed and implemented. Experimental results verify the advantages of the proposed ballast; these include the following: the input current harmonics meet the IEC 61000-3-2 Class C Standard, and the ballast offers lower conducted EMI and lower current stress on switches and diodes.