Use a three-phase rectifier and voltage reducer for offline single-phase power supplies

摘要

Some industrial applications require you to feed a low-power dc/dc converter from a three-phase source and possibly to deal with line-to-line voltages of 200 or 400V rms. Further, the neutral terminal of the ac source may be unavailable for connec tion, forcing you to use a line-to-line voltage link, which means a higher input voltage. Voltage faults can happen in one or two phases, and some applica tions require the power supply to keep working despite this problem.