A technique is disclosed that improves immunity to conducted AC line noise
through the use of primary-side FET shunt capacitors on fly back AC/DC converters to
provide a second filtering stage.
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INC, HP, "USE OF PRIMARY SIDE FET SHUNT CAPACITORS ON FLY BACK AC/DC CONVERTER TO INCREASE AC LINE CONDUCTED NOISE IMMUNITY", Technical Disclosure Commons, (July 20, 2018)