Power Supply for Helmholtz Coil

Arnaudov, Dimitar; Sokerov, Blagoy Petkov

doi:10.1109/electronica.2018.8439711

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…On the contrary, diminishing R 2b in excess can increase the transconductance gain to an undesired point, as can be seen in (8). This will impact on the current resolution that can be achieved by the HCS and also on its immunity to noise, as exemplified in section IV-B.…”

Section: Designing the Hcs Circuitmentioning

confidence: 95%

“…Accounting that (7) is satisfied, (5) can be rewritten as (8), which describes the output current of the HCS as a function of its input voltage.…”

Section: A Current In the Loadmentioning

confidence: 99%

“…Equation (17) shows that a variation of R 2b will cause a proportional variation on i L . This relationship is deduced from (8), which is based on the premise that (7) holds. As explained above, the resistance value chosen for R 2b is around one ohm and the other resistors have values 10 3 times greater, at least.…”

Section: B Hcs Stability Due To R 2b Temperaturementioning

confidence: 99%

“…Obviously, for lower currents and consequently for lower field magnitudes the system frequency bandwidth will increase accordingly. Now with the system parameters dimensioned and all resistance values determined, we can obtain the trasconductance gain value and rewrite (8) as…”

Section: Designing the Hcs Circuitmentioning

confidence: 99%

“…The current source is an essential part of the Helmholtz coil. Its characteristics are greatly influenced by the coil's construction and electrical parameters [8]. Hence, the power supply and its design parameters must be addressed during the entire system design process.…”

Section: Introductionmentioning

confidence: 99%

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Howland Current Source Applied to Magnetic Field Generation in a Tri-Axial Helmholtz Coil

et al. 2019

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This work describes the design and testing of a power Voltage-Controlled Current Source (VCCS) based on the Howland Current Source (HCS) topology. This source is part of a system that contains a three-axial Helmholtz coil and is used to generate a controlled magnetic field environment for aerospace applications. Initially, the paper presents the HCS theory and practical limitations on the premise that the system must be built using low-cost off-the-shelf components. The paper also carefully address on how to design and plan the VCCS matching physical and electrical parameters/limitations of a specific Helmholtz coil. All project details as well as the built VCCS electronics and its results are shown. These include linearity and a first order calibration test, stability and low-frequency error measurement, step response and a frequency limitation analysis. The built source is capable of sourcing up to ±1.5 A at ±25 V, maintaining its linearity and achieving an error smaller than 0.5% with a first order calibration. The final HCS prototype together with the Helmholtz coil allows an excellent capability regarding magnetic field generation for both open and closed-loop applications.

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Section: Designing the Hcs Circuitmentioning

confidence: 95%

“…Accounting that (7) is satisfied, (5) can be rewritten as (8), which describes the output current of the HCS as a function of its input voltage.…”

Section: A Current In the Loadmentioning

confidence: 99%

Section: B Hcs Stability Due To R 2b Temperaturementioning

confidence: 99%

Section: Designing the Hcs Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%