Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1999-09-14
2000-09-12
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
327172, 324307, H02M 542, H03K 3017, G01R 3320
Patent
active
061186813
ABSTRACT:
In a gradient amplifier for a nuclear magnetic resonance tomography apparatus and a method for operating same, a reference value unit for providing a reference value for a gradient coil current, an actual value unit for determining an actual value of the gradient coil current, a control unit for determining a setting value, a modulator for generating at least one output stage drive signal and an output stage for generating an output signal across the coil are provided. The precision of the reference value and the precision of the actual value are higher by at least the factor of 10 than the precision of the setting value and/or of the at least one output stage drive signal and/or of the output signal. As a result, the gradient amplifier has a precision that is high enough to avoid disturbances affecting in the image can be realized with relatively little outlay.
REFERENCES:
patent: 4437053 (1984-03-01), Bax
patent: 5063349 (1991-11-01), Roemer et al.
patent: 5111378 (1992-05-01), Nowak et al.
patent: 5973527 (1999-10-01), Schweighofer et al.
patent: 6034565 (2000-03-01), Schweighofer
Patel Rajnikant B.
Siemens Aktiengesellschaft
Wong Peter S.
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