Electric circuit arrangement for energizing a magnet of a magnetic resonance imaging facility and magnetic resonance imaging facility

A magnetic resonance imaging apparatus comprising:

• an electric circuit arrangement to energize a magnet of the magnetic resonance imaging device, the electric circuit arrangement including
• a first circuit to generate a direct voltage as a DC link voltage from an alternating voltage,
• a second circuit configured as a current source fed by the DC link voltage, the second circuit including
• a down converter to generate a primary current from the DC link voltage, the down converter having a first inductor,
• a transformer to generate a secondary current from the primary current, the transformer having a primary side, a secondary side and a primary coil, the primary coil having a second inductor,
• a switching device to receive the primary current and configured to output the primary current in different flow directions to the primary side of the transformer, and
• a rectifier to generate a rectified secondary current to energize the magnet, the rectifier being connected to the secondary side of the transformer, and
• at least one control device to control the switching device to output the primary current in a different flow direction to the primary side of the transformer, wherein
• the first inductor is larger than the second inductor.