A system and method is provided for coupling a power source across a rotation boundary. A generator converts a DC source on the stationary side of a rotation boundary to a square-wave at a determined frequency. The generator output connects through a transmission line and a first transformer to a set of stator rings. A set of rotor rings form a set of coupling capacitors with the stator rings. The rotor rings connect through a second transformer and a transmission line to a non-linear circuit capable of converting the square-wave to a DC voltage and current that can power a load on the rotating side of the rotating boundary in which the power is nearly equal to the power available from the source on the stationary side of the rotation boundary.