Abstract: A power transfer and monitoring device for an X-ray tube may include: an X-ray filament; a transformer including a primary coil and a secondary coil, wherein the secondary coil of the transformer includes a first leg, a second leg, and a middle leg; a current supply configured to supply a sinusoidal current to the primary coil of the transformer; and a calculation unit configured to measure a primary current of the transformer, configured to determine a synthesized transformer magnetizing current, and configured to subtract the synthesized transformer magnetizing current from the primary current of the transformer to determine a value of filament current through the X-ray filament. The first and second legs of the secondary coil of the transformer alternately supply current to a first end of the X-ray filament. The middle leg of the secondary coil of the transformer supplies current to a second end of the X-ray filament.

Abstract: A power transfer and monitoring system for an X-ray tube includes a transformer including a primary coil and a secondary coil, a current supply that supplies a sinusoidal current to the transformer, and a current calculation unit which measures the primary current of the transformer, and synthesises the transformer magnetising current, and which to subtract the synthesised transformer magnetising current from the primary current to generate a value for the filament current.