... It claims "dielectric biased isolation transformers". Patent here -
https://www.google.com/patents/US20150048916 ...
That patent
application appears to describe a variation on the prior art of placing an electrostatic shield between the windings of a transformer. The difference is that it uses multiple shields with biasing voltage(s) applied to them in order to create an electrostatic field between the shields. The conductors of the transformer windings are in this field, and the claims are that the field alters the effects of the dielectric (insulation) of the conductors. For example:
"Primary and secondary windings (...) include a conductor through which the AC signal travels, and the conductor may be insulated by an insulation layer (...) composed of dielectric material. (...) the dielectric material may be biased by an electrostatic field formed to reduce the amount of noise or distortion the AC signal may experience while traveling through the primary and secondary windings (...). In this regard, with the reduced noise and distortion, the AC signal can travel through the primary and secondary windings (...) more efficiently."
And:
"In some aspects, primary and secondary windings (...) define a signal path to transform the input electrical signal into the output electrical signal along the signal path. In this respect, the signal path may travel from primary winding (...) to secondary winding (...). The signal path may provide signal transmission of sensitive electrical signals directed to audio, video and/or data transmission systems. The signal path may include undesirable electrical properties that impact the integrity of the signal transmission(...). (...) dielectric biasing may be applied to (or impressed on) insulated conductive layers (...) using first and second voltages to form an electrostatic field such that the undesirable electrical properties present in the signal path can be removed and allow components within transformer (...) to reach the stable electrical state sooner."
Hopefully the body of the application was better proofread than the "Field" statement:
"The present disclosure relates to electrical power systems, and more particularly a dielectric biasing circuit for the electro-magnetic used in alternating current devices."
In summary, it's the same sort of science that says applying biasing voltage to the insulation in cables will improve their performance.
Google's copy doesn't appear to show the full images. The USPTO copy does:
http://pdfaiw.uspto.gov/.aiw?PageNum=0&docid=20150048916&IDKey=11B3F51819CA&HomeUrl=http%3A%2F%2Fappft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO1%2526Sect2%3DHITOFF%2526d%3DPG01%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsrchnum.html%2526r%3D1%2526f%3DG%2526l%3D50%2526s1%3D%25252220150048916%252522.PGNR.%2526OS%3DDN%2F20150048916%2526RS%3DDN%2F20150048916