Amplifiers – Wheatstone bridge with amplifier in at least one arm
Reexamination Certificate
2006-10-03
2006-10-03
Nguyen, Khanh van (Department: 2817)
Amplifiers
Wheatstone bridge with amplifier in at least one arm
C330S251000, C330S20700P
Reexamination Certificate
active
07116166
ABSTRACT:
A gradient amplifier arrangement is described that comprises a gradient amplifier power stage. The device may be employed to provide a current to a gradient coil, as in a MRI system. The circuitry disclosed includes a series coupling of a first bridge amplifier operating at a first voltage, a second bridge amplifier operating at a second voltage, a third bridge amplifier operating at a third voltage, and a gradient amplifier control stage. The amplifiers may provide output voltages at different levels, and may be switched at different times and frequencies to provide a range of output voltage and current levels.
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Sabata J. et al.; “High-power high-fidelity switching amplifier driving gradient coils for MRI systems”; Power Electronics Specialists Conference, 2004. PECS 04, 2004 IEEE 35thAnnual Aachen, Germany Jun. 20-25, 2004, Piscataway, NJ, USA, IEEE, US, Jun. 20, 2004; pp. 261-266.
Steigerwald R. L. et al.; “High-power, high-performance switching amplifier for driving magnetic resonance imaging gradient coils”; Power Electronics Specialists Conference, 2000; PESC 00. 2000 IEEE 31stAnnual Jun. 18-23, 2000, Piscataway, NJ, USA, IEEE, Jun. 18, 2000; pp. 643-648.
Garces Luis Jose
Li Qiming
Sabate Juan Antonio
Szczesny Paul Michael
Wirth William Frederick
Fletcher Yoder
General Electric Company
Nguyen Khanh van
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