Switching Power Supplies A - Z

Fixing EMI across the Board

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Figure 12-5: Correct Way to Parallel Windings

effect losses in forward converters. This is acceptable for EMI provided the two split

winding sections are in series. In general, putting windings in parallel is not a good

idea (especially from the EMI point of view). In high-current power supplies, the

secondary winding is also sometimes broken up into two windings (or foils).

The intention is usually to increase the current handling capability. See Figure 12-5.

But these split secondaries are also usually placed physically apart, on either side of

the primary winding. However, in paralleled windings, ...