SINGLE TRANSISTOR ELECTRONIC BALLAST

摘要

An electronic ballast (10) includes a dual function power transistor (16) that supports both power factor correction and inverter functionality. To assist in controlling voltages across this transistor (16) during all phases of operation, two dual function diodes (21, 19) are provided. A boost inductor (14) is coupled to both the dual function power transistor (16) and the bulk energy storage capacitor (22) so that when the dual function power transistor (16) opens, energy from the boost inductor is transferred to the bulk energy storage capacitor (22).