AC supplied ballast for DC fluorescent lamps - has full wave rectifier with at least two phase shifters and rectifier systems connected in parallel

摘要

The phase shifters (12,13) shift the phases of the current components (i1-i3), and rectifiers (3,10) for the phase shifted currents are connected in parallel on the d.c side. Each phase shifter (12,13) is connected through the rectifiers (3,10) to the two d.c outputs (C,D) for connection to the same load. The rectifiers (3,10) consist of full wave rectifier bridges with four diodes (4,5,6,7) and (14,15,16,17). The phase shifters (12,13) are connected to pairs of inductances (L12,L'12) and (L13,L'13).