Modular MRI gradient amplifier using unipolar PWM drive
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United States of America Patent
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-
Nov 27, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Sep 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gradient amplifier (20), for driving a gradient coil (22) of an MRI scanner, includes a plurality of first modules (60). The first modules (60) provide unipolar PWM control of an input supplied thereto to generate a unipolar waveform. A high voltage DC power supply (64) electrically connected to the first modules (60) supplies the input to the first modules (60). At least one second module (140a, b) is electrically connected to the first modules (60). The second module (140a, b) selectively provides polarity switching of the unipolar waveform output from the first modules (60) to generate a bipolar waveform which drives the gradient coil (22).
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