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Magnetic core

About: Magnetic core is a research topic. Over the lifetime, 30011 publications have been published within this topic receiving 155247 citations.


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Patent
27 Feb 2004
TL;DR: An on-chip inductor device for integrated circuits utilizes coils on a plurality of metal layers of the IC with electrical connectors between the coils and a magnetic core for the inductor of stacked vias running between coils as mentioned in this paper.
Abstract: An on-chip inductor device for Integrated Circuits utilizes coils on a plurality of metal layers of the IC with electrical connectors between the coils and a magnetic core for the inductor of stacked vias running between the coils. The magnetic core is made from a series of stacked vias which are deposited between each metal layer of the IC having a coil. The magnetic core desirably includes an array of magnetic bars comprising the magnetic core. The via material of the magnetic core may be both magnetic and electrically conductive. The magnetic and electrically conductive via material may also be used for the planar coil electrical connectors or other electrically conductive parts of the IC, or both, thereby lessening fabrication steps. Films of magnetic material may be formed at the ends of the inductor to provide a closed magnetic circuit for the inductor. A high Q factor inductor of small (e.g., transistor) size is thus obtained. The materials and processes which enable the on-chip inductor device are compatible with ordinary IC fabrication methods.

72 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the magnetic integration of the LCL filter in grid-connected inverters and showed that by sharing an ungapped core and arranging the windings properly, the fundamental fluxes generated by the two inductors of an LCL filters cancel out mostly in the common core.
Abstract: This letter investigates the magnetic integration of the LCL filter in grid-connected inverters. By sharing an ungapped core and arranging the windings properly, the fundamental fluxes generated by the two inductors of an LCL filter cancel out mostly in the common core. Thus, the common core with low flux level can be dramatically reduced. Although the reluctance of the common core can hardly be zero, which implies an inevitable coupling between the integrated inductors, the proposed magnetic integration scheme is still attractive if the cross-section area and magnetic material of the common core are made reasonable. Experimental results from both single-phase and three-phase grid-connected inverters verify the effectiveness of the proposed method.

72 citations

Patent
10 Mar 1989
TL;DR: In this paper, a power transfer circuit includes first and second windings (L1,L2) sharing a common magnetic core (101), each winding has associated with it a parallel capacitor (C1,C2) to form a pair of "tank" circuits.
Abstract: A power transfer circuit includes first and second windings (L1,L2) sharing a common magnetic core (101). Each winding (L1,L2) has associated with it a parallel capacitor (C1,C2) to thus form a pair of "tank" circuits. The first winding (L1) is connected at one end to a voltage supply and, at the other end, to ground through an FET switch (100,200). The switch (100,200) is turned on and off at a predetermined frequency and at a 50% duty cycle. The second winding (L2) and associated capacitor (C2) achieves parallel resonance at the predetermined frequency. Similarly the combined first and second windings (L1,L2) and associated capacitors (C1,C2) achieve parallel resonance at said predetermined frequency. The second winding (L2) need not be electrically connected to the first winding (L1) which transfers energy to it through the magnetic core (101). The transfer circuit efficiently couples power across a dielectric interface to a pickup coil (L3). One particularly good application of the power taansfer circuit is in connection with a contactless Smart Card.

72 citations

Proceedings ArticleDOI
01 Dec 2006
TL;DR: In this article, an amorphous CoZrTa alloy exhibiting high permeability, good high-temperature stability (>250degC), high saturation magnetization, low magnetostriction, high resistivity, minimal hysteretic loss was used in combination with magnetic vias and elongated structures that take advantage of the uniaxial magnetic anisotropy.
Abstract: On-chip inductors with 2 levels of magnetic material were integrated into an advanced 130 nm CMOS process to obtain over an order of magnitude (>14times) increase in inductance and Q-factor, significantly greater than prior values of 2.3times for high frequency inductors. The magnetic material is shown to operate at frequencies beyond 6.4 GHz for 1 nH inductors. An amorphous CoZrTa alloy exhibiting high permeability, good high-temperature stability (>250degC), high saturation magnetization, low magnetostriction, high resistivity, minimal hysteretic loss, and compatible with silicon technology was used in combination with magnetic vias and elongated structures that take advantage of the uniaxial magnetic anisotropy

72 citations

Journal ArticleDOI
TL;DR: An automatic cooling device to eliminate the waste heat of machinery has been made by utilizing a temperature-sensitive magnetic fluid as discussed by the authors, which requires no pump for flowing the fluid, since a part of the thermal energy is converted to the kinetic energy.
Abstract: An automatic cooling device to eliminate the waste heat of machinery has been made by utilizing a temperature-sensitive magnetic fluid. This cooler requires no pump for flowing the fluid, since a part of the thermal energy is converted to the kinetic energy. If a permanent magnet is used, power supply is unnecessary. The cooler is expected to be maintenance-free and simple in shape.

72 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022163
2021309
2020900
20191,254
20181,426