Low-EMI transformer

Abstract

A transformer has: i) a magnetizable core with respective primary and secondary coils; ii) a ground terminal for electrically connecting to an external ground terminal of an electric power grid, and iii) a physical electrical ground node placed at a location within the isolation transformer (100e1), wherein the physical electrical ground node is electrically connected to the ground terminal. The transformer has: iv) at least two electrically-conductive loops that are placed at different locations in the transformer where a magnetic field may be built up during operational use, and v) a switching circuit configured for sequentially, temporarily and selectively electrically coupling subsets of the electrically-conductive loops with the physical electrical ground node in accordance with a certain sequence and pattern. An isolation transformer may be much less susceptible to EMI without requiring any adaptation of the standards.

Dependencies are inferred from the claim text.