X-ray imaging apparatus, and power distribution unit and wireless power transfer device thereof

A wireless power transfer device, comprising:

• a first annular structure, on which a first frame is fixed, a first winding being wound around the first frame;
• and
• a second annular structure, on which a second frame is fixed, a second winding being wound around the second frame,
• wherein the first winding and the second winding are disposed facing each other, and the second annular structure is rotatable relative to the first annular structure.

An X-ray imaging apparatus, comprising a power distribution unit and/or a wireless power transfer device,

• wherein the power distribution unit comprises:
• a first rectifier circuit, a charging circuit, an energy storage module, and a first inverter circuit,
• wherein input terminals of the first rectifier circuit and input terminals of the charging circuit are both externally connected to a power grid;
• wherein an output terminal of the first rectifier circuit is connected to an input terminal of the first inverter circuit, and an output terminal of the first inverter circuit is connected to the wireless power transfer device;
• wherein an output terminal of the charging circuit is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the input terminal of the first inverter circuit;
• wherein the first inverter circuit is configured to convert an output voltage of the first rectifier circuit into an alternating current voltage and output the alternating current voltage to the wireless power transfer device;
• and
• wherein the wireless power transfer device comprises:
• a first annular structure, on which a first frame is fixed, a first winding being wound around the first frame;
• and
• a second annular structure, on which a second frame is fixed, a second winding being wound around the second frame,
• wherein the first winding and the second winding are disposed facing each other, and the second annular structure is rotatable relative to the first annular structure.