Roque, AntónioMaia, JoséMargato, ElmanoSousa, Duarte de Mesquita eMarques, Gil2015-05-072015-05-072014ROQUE, António; MAIA, José; MARGATO, Elmano da Fonseca; SOUSA. Duarte de Mesquita e; MARQUES, Gil - Control of a power supply with cycling current using different controllers. International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). ISBN 978-1-4799-4749-2. (2014), pp. 560-565978-1-4799-4749-2http://hdl.handle.net/10400.21/4492Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometers require controlled current sources in order to get accurate flux density with respect to its magnet. The main elements of the proposed solution are a power semiconductor, a DC voltage source and the magnet. The power semiconductor is commanded in order to get a linear control of the flux density. To implement the flux density control, a Hall Effect sensor is used. Furthermore, the dynamic behavior of the current source is analyzed and compared when using a PI controller and a PD2I controller.engPower supplyFlux densityCurrent, controlFast field cycling NMRRelaxometerjournal article10.1109/SPEEDAM.2014.6872066