TRANSFORMER Russian patent published in 2009 - IPC H01F30/06 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for transforming alternating voltage. The transformer has a closed core, passing inside the secondary winding and enveloping it on the outside. All wires of the primary winding are on the outer side of the magnetic core. During standard connection of the primary winding to alternating voltage, the magnetic core behaves as an open core, which does not prevent output voltage across the secondary winding. If the secondary winding is connected to alternating voltage, almost all the magnetic flux is closed by the magnetic core inside the primary winding, and the very small emf induced in it is only determined by scattering of magnetic field outside the magnetic core.

EFFECT: transformation of energy to one side only with suppression of reverse transfer.

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