Paul is correct in this senario... SD Paul Bidmead wrote:
not entirely true a 50hz transformer can be used at 400hz but not vise versathe losses infolved in this instance are due to the amount of on time - longer its on the more magnetic flux built up therefore approching saturation if its reversed quicker it doesnt have a chance to build up as far -- having said that it will still be slightly less efficient for high power applications due to reduced coupling
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