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Inductor

About: Inductor is a research topic. Over the lifetime, 52565 publications have been published within this topic receiving 484068 citations. The topic is also known as: passive two terminal.


Papers
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Journal ArticleDOI
TL;DR: In this article, a planar spiral inductor with the strips suspended individually has been fabricated in standard GaAs high electronmobility transistor monolithic-microwave integrated-circuit technology through maskless front-side bulk micromachining.
Abstract: A new micromachined planar spiral inductor, with the strips suspended individually, has been fabricated in standard GaAs high electron-mobility transistor monolithic-microwave integrated-circuit technology through maskless front-side bulk micromachining. The electronic compatibility, the use of industrial integrated-circuit production lines, the straightforward and low-cost additional procedure for structure releasing, and the very short etching time required are the principal features related to such a novel inductor structure. Moreover, the air-gap layer created underneath the device and between the strips significantly reduces shunt and fringing parasitic capacitances, consequently increasing the performance and operating frequency range. Experimental measurements, carried out up to 15 GHz, before and after micromachining, showed for a 12-nH inductor an increase of the maximum Q factor from 5 (at 3 GHz) to about 20 (at 7 GHz), while the self-resonant frequency was shifted from 5 to 13 GHz. Furthermore, a structure with two interleaved spiral inductors, in a 1:1 transformer-like configuration, was also fabricated, and its performance verified in order to demonstrate the promising performance improvements provided by the proposed device. Finally, heating and mechanical characteristics associated with freestanding microstructures are briefly evaluated using finite-element method simulations.

97 citations

Patent
25 Aug 2000
TL;DR: In this paper, the authors proposed a constant frequency, DC/AC inverters that employ a coupled inductor to achieve ZVS in a wide range of load current and input voltage with a reduced circulating energy.
Abstract: A constant frequency, DC/AC inverters that employs a coupled inductor to achieve ZVS in a wide range of load current and input voltage with a reduced circulating energy. In the circuits of the invention, the two windings of the coupled inductors are connected in series and their common terminal is connected to one end of the primary winding of the isolation transformer, which has the other end of the primary winding connected to ground. Each of the other two terminals of the coupled inductors is coupled to the midpoint of the corresponding bridge leg through a series connection of the resonant inductor and a resonant or blocking capacitor. For non-isolated inverter implementations, the common terminal of the coupled inductor is connected directly to the load. The output voltage regulation in the inverters is achieved by a constant-frequency phase shifted control.

97 citations

Journal ArticleDOI
TL;DR: In this paper, the authors designed and implemented a 25 kW, 3.8 kV single-phase AC to 7 kV DC PFC rectifier unit based on the 10 kV SiC MOSFETs.
Abstract: Due to their extremely high energy demand, data centers are directly supplied from a medium-voltage (MV) grid. However, a significant part of this energy is dissipated in the power supply chain since the MV is reduced step-by-step through multiple power conversion stages down to the chip-voltage level. In order to increase the efficiency of the power supply chain, the number of conversion stages must be substantially reduced. In this context, solid-state transformers (SSTs) are considered as a possible solution, as they could directly interface the MV AC grid to a 400 V DC bus, whereby server racks with a power consumption of several tens of kilowatts could be directly supplied from an individual SST. With a focus on the lowest system complexity, the SST, ideally, should be built as simple two-stage system consisting of an MV AC/DC power factor correction (PFC) rectifier stage followed by an isolated DC/DC converter. Accordingly, this paper focuses on the design and realization of a 25 kW, 3.8 kV single-phase AC to 7 kV DC PFC rectifier unit based on the 10 kV SiC MOSFETs. By simply adding an $LC$ circuit between the switch nodes of the well-known full-bridge-based pulse width modulated AC/DC rectifier, the integrated triangular current-mode concept is implemented, which only internally superimposes a large triangular current ripple on the AC mains current and, therefore, enables zero-voltage switching over the entire AC mains period. Special attention is paid to the realization of the MV inductors and their electrical insulation, the AC-input $LCL$ filter to limit electromagnetic interference emissions, and the challenges arising due to cable resonances when connecting the SST to the MV grid via an MV cable. Despite the large insulation distances required for MV, the realized 25 kW MV PFC rectifier achieves an unprecedented power density of 3.28 kW/L (54 W/ $\mathrm {in}^{3}$ ) and a full-load efficiency of 99.1%, determined using a calorimetric measurement setup, which is discussed in detail in the Appendix.

97 citations

Patent
10 Sep 1998
TL;DR: In this paper, an electronic article surveillance system for detecting the tag within a surveilled area utilizing electromagnetic energy at a predetermined detection frequency includes a resonant circuit (66, 68) capable of resonating at a specified detection frequency.
Abstract: A resonant tag (58) used with an electronic article surveillance system for detecting the tag within a surveilled area utilizing electromagnetic energy at a predetermined detection frequency includes a resonant circuit (66, 68) capable of resonating at the predetermined detection frequency. The resonant circuit (66, 68) includes an inductor (66) formed at least in part on a surface of a dielectric substrate of the tag (58). The inductor (66) is formed with a discontinuity or gap (74) causing an electrical open circuit. The open circuit is closed with a fuse (36) secured proximate to the gap (74) and wirebonded (40, 42) to the portions of the inductor (66) proximate to the gap (74). The fuse (36) is melted by a current greater than a predetermined level flowing therethrough. Such a high current may be induced in the inductor (66) by an external electromagnetic field. Melting of the fuse (36) causes an open circuit condition, which alters the frequency at which the tag (58) resonates.

97 citations

Patent
13 May 2011
TL;DR: In this paper, a digital signal processing circuit detects a phase of an input voltage, and a switching frequency of the switching element is modulated in accordance with the phase, so that a wide range of input voltages can be accepted while suppressing EMI noise.
Abstract: A power factor correction converter includes a diode bridge arranged to perform full-wave rectification on an AC input power supply, a switching element arranged to perform switching on an output voltage thereof, an inductor arranged to pass a current interrupted by the switching element and to accumulate and emit excitation energy, a diode, and a smoothing capacitor defining a step-up chopper circuit. A digital signal processing circuit detects a phase of an input voltage, and a switching frequency of the switching element is modulated in accordance with the phase. Accordingly, the switching frequency can be appropriately modulated without depending on an input voltage, so that a wide range of input voltages can be accepted while suppressing EMI noise with a peak generated in the switching frequency and higher-order frequency components thereof.

97 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023985
20222,105
20211,507
20202,637
20193,217
20183,173