A switching circuit configured to substantially linearly conduct current between
a source and a load includes a switching device and a steering circuit. The switching
device has a conductive state in which a first portion of the current flows between
the source and the load, the conductive state being dependent on the magnitude
of the current. The steering circuit has a conductive state in which a second portion
of the current flows, such that substantially the entire current is conducted between
the source and the load. The switching circuit is particularly suited for use in
a magnetic resonance imaging system to conduct gradient current between the gradient
amplifiers and the gradient coils.
