A transformer for a power converter, comprising: a first auxiliary subcore, a central subcore,
and a second auxiliary subcore, each respective subcore comprising a lower plate, at least
one pair of central spacers, and an upper plate, the lower plate, at least one pair of central
spacers, and the upper plate of each subcore, being respectively separated by a gap; the
first auxiliary subcore and the central subcore being separated by a gap; the second
auxiliary subcore and the central subcore being separated by a gap; a primary coil …