High-isolation converters use off-the-shelf magnetics


Posted on Nov 28, 2012

Isolated flyback converters usually evoke thoughts-or bitter memories-of custom transformers, slipped delivery schedules, and agency-approval problems. Off-the-shelf flyback transformers carry isolation ratings of only 300 to 500V and rarely of as much as 1 kV. Gate-drive transformers are readily available from stock with high isolation ratings and low cost, but they are wound on ungapped cores, have high inductance (500 µH to 2 mH), and quickly saturate in a normal flyback-converter circuit.






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