Continuous-conduction-mode charge-pump power-factor-correction electronic ballast with DC-bus voltage stress reduction function

This paper presents the continuous-conduction-mode charge-pump power-factor-correction (CCM CP-PFC) electronic ballast with DC-bus voltage stress reduction function. The CP-PFC techniques are widely applied to the electronic ballasts in order to achieve high power factor. However, the DC-bus voltage at preheat or ignition mode is higher than that at steady-state operation, which causes high voltage stresses on the active and passive components. Therefore, the input notch filter for the CCM CP-PFC electronic ballast is proposed in order to reduce the DC-bus voltage stress at preheat and ignition modes. Furthermore, to achieve high power factor functionality, the design guidelines for the CCM voltage-source (VS) CP-PFC electronic ballast is presented. Finally, one prototype circuit of the CCM VS CP-PFC electronic ballast for one T5-54W fluorescent lamp is built to verify the performance of the PFC and the voltage-stress reduction capability of the DC-bus.