Electronics > Beginners
Applying DC bias on a high voltage rectified ripple 570VAC down to offset zero
ELS122:
--- Quote from: Wolfram on January 29, 2020, 05:55:04 pm ---Three single-phase mains transformers connected in star on the input and delta on the output, followed by a three-phase rectifier would do the job. Neutral is not needed on the primary side as the secondary delta connection will force the primary star point to the sum of the phase voltages (at least for the fundamental 50 Hz component). With loss of a phase, the rectified voltage would probably be lower (by a factor of sqrt(3)/2), and there would be more ripple, but for 100 mA draw it should be easy to dimension the filter capacitors and regulator to account for this.
--- End quote ---
maybe it's also possible to use cheap china dc-dc buck converters and feed them from rectified 3 phase mains.
but it's probably gonna be hard finding a buck converter that can hold 600+V on the input
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