DRIVER FOR A GAS DISCHARGE LAMP

摘要

A two-stage electronic ballast (301; 401) for driving a gas discharge lamp comprises:- a half-bridge commutating forward (HBCF) stage (250) comprising a series arrangement of a first buffer capacitor (251) and a second buffer capacitor (252) connected between two bridge input terminals (261, 262);- and a double flyback converter stage (310; 410) comprising an inductive energy storage buffer (320; 420) having at least one input circuit (330) suitable for receiving a rectified AC mains input voltage, the buffer further having at least two output circuits (340, 350), each output circuit being coupled to a respective buffer capacitor (251, 252) of said half-bridge commutating forward (HBCF) stage (250) for individually charging said buffer capacitors (251, 252).