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That is true, but the leakage there is way smaller than the leakage from a EI core, for the same nominal flux.A significant issue is that most often, toroidals are operating at higher flux than EI or R cores, since it allows publishing a higehr power-to-bulk ratio.When I had the luxury of having custom wound xfmrs, I always asked operating at lower flux, which generally implied using a bigger core than normallly accepted.It's true that the construction of toroidals increases capacitive coupling and that's why adequate filtering and wiring must be applied, nominally the mandatory protective earth and the three capacitors two to earth, one across) in the mains connection.In terms of insulation, the outer layer of primary and the inner layer of secondary is the critical area. A dedicated insulation layer is generally applied.
That is true, but the leakage there is way smaller than the leakage from a EI core, for the same nominal flux.
A significant issue is that most often, toroidals are operating at higher flux than EI or R cores, since it allows publishing a higehr power-to-bulk ratio.
When I had the luxury of having custom wound xfmrs, I always asked operating at lower flux, which generally implied using a bigger core than normallly accepted.
It's true that the construction of toroidals increases capacitive coupling and that's why adequate filtering and wiring must be applied, nominally the mandatory protective earth and the three capacitors two to earth, one across) in the mains connection.
In terms of insulation, the outer layer of primary and the inner layer of secondary is the critical area. A dedicated insulation layer is generally applied.
