Transformer-coupled gradient speed-up circuit

Details Transformer-coupled gradient speed-up circuit Transformer-coupled gradient speed-up circuit

1990-06-04

1991-11-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

050633490

ABSTRACT:
A gradient current speed-up circuit, for use in a higher-speed NMR imaging system having an associated gradient coil, has a gradient power amplifier receiving an input analog signal controlling amplifier output current, and a transformer having a primary winding and a pair of secondary windings connected in series with the amplifier output and the coil. Semiconductor switching elements selectively connect the primary winding between first and second potential sources, and are turned on and off in selected patterns to cause a current to be suddenly applied to, and removed from, flow through the associated gradient coil; the amplifier output current is changed with the gradient coil current lags behind an amplitude commanded by a master input signal.

REFERENCES:
patent: 4961054 (1990-10-01), Park et al.
patent: 5017871 (1991-05-01), Mueller et al.

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