Multi-channel current control system for coupled multi-coil arrays

For imaging and magnetic manipulation experiments in Magnetic Particle Imaging several field generating coils are required to produce sufficiently high and flexible magnetic fields. To minimize the power consumption, coils with iron cores are the best choice for low and medium frequency ranges. Such coils have comparatively high reactance and are often inductively coupled. The trivial approach to ensure target currents is to provide each coil with a current controlled source resulting in high system complexity and high costs. This paper presents a circuit design to distribute bipolar target currents from a single unipolar source with high accuracy, reducing unwanted coil coupling by a feedback controller. Thus, the number of current sources can be significantly reduced. With a regenerative concept, reactive power is stored and can be reused, allowing efficient and fast current switching.

DDC Class

004: Informatik

610: Medizin

Funding(s)

Modellbasierte Parameteridentifikation in Magnetic Particle Imaging

Funding Organisations

Bundesministerium für Bildung und Forschung (BMBF)

More Funding Information

Research funding: The authors thankfully acknowledge the financial support by the German Research Foundation (DFG, grant number KN 1108/7-1 and GR 5287/2-1).

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publishedVersion

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https://creativecommons.org/licenses/by/4.0/

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414-Article Text-2157-1-10-20220320.pdf

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293.62 KB

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Multi-channel current control system for coupled multi-coil arrays