Magneto-optical current sensing for applications in integrated power electronics modules

Bai, John G.; Lü, Gongxuan; Lin, Tao

doi:10.1016/j.sna.2003.09.038

Cited by 26 publications

(12 citation statements)

References 17 publications

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“…This trigonal axis coincides with the [111] direction. Finally, the third tetrahedral site also contains Fe 3+ ions (24d) [5,6,7,8]. The substitution of Y 3+ by magnetic rare earth ions promotes the formation of a new magnetic sub-lattice, which in turn causes the material to have a compensation point below room temperature [9,10].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

et al. 2018

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The effect of the substitution of Y3+ by Nd3+ on the structural and magnetic properties of neodymium-doped yttrium iron garnet, NdxY3−xFe5O12 with x in the range of 0–2.5, is presented. Oxide powders of Fe2O3, Nd2O3, and Y2O3 were mixed in a stoichiometric ratio and milled for 5 h using high-energy ball milling, before being uniaxially pressed at 900 MPa and annealed at 1373 K for 2 h to obtain NdxY3−xFe5O12 (0 ≤ x ≤ 2.5). It was found that the mechanical milling of oxides followed by annealing promotes the complete structural formation of the garnet structure. Additionally, the X-ray diffraction patterns confirm the complete introduction of Nd3+ into the garnet structure with a neodymium doping concentration (x) of 0–2.0, which causes a consistent increment in the lattice parameters with the Nd3+ content. When x is higher than 2.0, the yttrium orthoferrite is the predominant phase. Besides, the magnetic results reveal an increase in the Curie temperature (583 K) as the amount of Nd3+ increases, while there was enhanced saturation magnetization as well as modified remanence and coercivity with respect to non-doped YIG.

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Section: Introductionmentioning

confidence: 99%

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

et al. 2018

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“…In this context, magneto-optical (MO) sensors based on the Faraday effect are superior due to their ability to acquire magnetic field images with a high spatial resolution but without the need for translation. In the area of non-destructive testing (NDT) MO sensors based on the Faraday effect are used for a variety of applications: the recognition of fatigue cracks and corrosion on aluminum aircraft skins and structural components via eddy current imaging [3], the detection of cracks in ferromagnetic metals via flux leakage measurements [4], and furthermore for the visualization of electric currents in microelectronic circuits [5] and integrated power modules [6]. This paper presents a measurement setup (Sec.…”

Section: Introductionmentioning

confidence: 99%

Inspection of electrical interconnections within power ICs via magneto-optical imaging

Dietachmayr¹,

Hölzl²,

Zagar³

et al. 2015

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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During their lifetime, power electronic components have to endure several million cycles of thermo-mechanical stress. In this context, the electrical interconnections between the die and the output pins are crucial. Usually, bond wires with diameters ranging from 400 µm to less than 50 µm are used to establish the electrical interconnections. Typically, due to the small diameters, redundant wires are necessary in order to guarantee the currentcarrying rating of the device. In this particular case, commonly used electrical tests are not able to detect the loss of single wires. However, missing or not connected bond wires will result in a different magnetic field distribution surrounding the device. This paper presents a new measurement method based on a magnetooptical sensor to detect missing bond wires in a power MOSFET chip via magnetic field imaging. The Faraday effect is utilized, which enables us to resolve magnetic flux densities down to 127 nT with a spatial resolution of approximately 21.6 µm.This full text paper was peer-reviewed at the direction of IEEE Instrumentation and Measurement Society prior to the acceptance and publication.978-1-4799-6144-6/15/$31.00 ©2015 IEEE

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“…This rotation depends on the Verdet constant which a property of the material as well as the strength of the magnetic field and the optical path. Several studies have been performed to modify the performance of MO sensors, see for example [3,4]. In contrary to some bulk materials, the Verdet constant of optical fibers is quite small [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetic Field Inhomogeneity on a Magneto-Optical Current Sensor

El‐Khozondar¹,

Müller²,

El‐Khozondar³

et al. 2012

JST

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The growth in the capacity of electric power system creates a demand for the protection of relaying systems. Optical current transducers-OCT that are mainly made up of single mode optical fibers which are subjected to Faraday rotation are used as a replacement for electromagnetic transducers due to their immunity to electromagnetic interference. However, the principal parameter in this system, the sensitivity to magnetic fields or current, depends on the Verdet constant, which is low in the case of optical fibers. However, the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we study a current sensor, which is made up of a conductor coil with a fiber inside, thus increasing sensitivity. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor.

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Magneto-optical current sensing for applications in integrated power electronics modules

Cited by 26 publications

References 17 publications

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

Inspection of electrical interconnections within power ICs via magneto-optical imaging

Influence of Magnetic Field Inhomogeneity on a Magneto-Optical Current Sensor

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