Gradient magnetic field electronic power supply for gradient coi

Details Gradient magnetic field electronic power supply for gradient coi Gradient magnetic field electronic power supply for gradient coi

1997-11-21

2000-04-18

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

060519754

ABSTRACT:
A gradient magnetic field power supply includes an amplifier for supplying current to a gradient coil. Between input and output of the amplifier is connected a feedback circuit which feeds a portion of an output current at the output back to the input and has a built-in phase compensating circuit for compensating the phase of the feedback current. The frequency response of the phase compensating circuit is made variable and adjusted to fit variations in the load impedance of the amplifier with time. This ensures optimum phase compensation.

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patent: 5521507 (1996-05-01), Rohan et al.
patent: 5617030 (1997-04-01), Fischer et al.
"A 4-Switch GTO Speed-Up Inverter for Fast-Scan MRI", SMRM '92 Book of Abstracts. O.M. Mueller, et al.; p. 589, Aug. 8, 1992.
"A Resonant Multi Purpose Gradient Power Switch for High Performance Imaging", SMRM '92 Works-in-Progress. K.H. Ideler, et al; p. 4044, Aug. 8, 1992.

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