The gradient driver was implemented with SiC MOSFETs. The
amplifier has less losses and is more compact, however switching has higher
high frequency contents. The new amplifier was tested in an EMI shielded room.
The results show the effectiveness of the double shielding method at reducing
the radiated noise generated by a gradient driver system. The tests confirmed
the correlation between the conducted and radiated noise. The double shielding
method proposed reduced the radiated noise caused by the CM circulating current
between cables. The measurements showed up to 35dB radiated noise reduction
with this method.
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