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.

A planar inductor using Mn-Zn ferrite/polyimide composite thick film for low-Voltage and large-current DC-DC converter

Abstract: A new planar inductor using a composite magnetic core for low voltage and large current dc-dc converter has been developed The composite material consisted of a 40% volume fraction of Mn-Zn ferrite particle with a mean diameter of 10 /spl mu/m and polyimide matrix The composite magnetic core exhibited a low relative permeability of 6 The fabricated planar inductor with a size of 15/spl times/15/spl times/14 mm consisted of an inner two-turn copper square spiral coil, a top 350-/spl mu/m-thick composite magnetic core and a bottom 1-mm-thick Ni-Zn ferrite substrate The inductor had a dc coil resistance of 15 m/spl Omega/ and an inductance of 140 nH The degradation of inductance was below 4% at a superimposed dc current of 10 A A synchronous rectifier type buck converter with a switching frequency of 1 MHz, an input voltage of 5 V, and an output voltage of 1 V was constituted using a planar inductor, and exhibited a maximum conversion efficiency of 80% at 4 A

Effect of finite thickness of magnetic substrate on planar inductors

Abstract: The effect of finite thickness of magnetic substrate or film on the inductance of planar inductors is studied using the method of current images. The results obtained reduce to previous results in the limit of infinite thickness. It is found that the thickness and permeability play complementary roles in the enhancement of inductance, with the normalized inductance determined roughly by the product of permeability and thickness in the most interesting region of parameter space. The results derived allow determination of the required minimum thickness of the substrate which will produce maximum inductance enhancement for a given permeability of the substrate material. The same results can also be used to determine the permeability of a magnetic film or substrate quickly and are directly applicable to the design of planar inductors in cofireable ceramic, hybrid, and thin-film technologies. >

Antenna device and portable radio communication device comprising such antenna device

Abstract: The present invention relates to an antenna device for a portable radio communication device adapted for receiving and/or transmitting radio signals in at least a first and a second operating frequency band, said antenna device comprising a half-loop radiating element, comprising a feeding portion and a grounding portion, and arranged to operate at FM frequencies. The antenna device comprises a capacitor at said feeding portion and an inductor at said grounding portion, and said half-loop radiating element is arranged to simultaneously with FM frequencies operate at frequencies at least ten times higher than FM frequencies, wherein said capacitor is arranged to short circuit said half-loop radiating element to ground for frequencies at least ten times higher than FM frequencies and said inductor is arranged to short circuit said half-loop radiating element to ground for FM frequencies.

High-gain weakly nonlinear flux-modulated Josephson parametric amplifier using a SQUID-array

Abstract: We have developed and measured a high-gain quantum-limited microwave parametric amplifier based on a superconducting lumped LC resonator with the inductor L including an array of eight superconducting quantum interference devices (SQUIDs). This amplifier is parametrically pumped by modulating the flux threading the SQUIDs at twice the resonator frequency. Around 5 GHz, a maximum gain of 31 dB, a product amplitude gain x bandwidth above 60 MHz, and a 1 dB compression point of -123 dBm at 20 dB gain are obtained in the nondegenerate mode of operation. Phase-sensitive amplification-deamplification is also measured in the degenerate mode and yields a maximum gain of 37 dB. The compression point obtained is 18 dB above what would be obtained with a single SQUID of the same inductance, due to the smaller nonlinearity of the SQUID array.

Deadbeat Control of the Stand-Alone Four-Leg Inverter Considering the Effect of the Neutral Line Inductor

Abstract: Distributed generation (DG) has been considered as an alternative source of power generation, especially in stand-alone applications, where both single- and three-phase loads must be supplied with fixed amplitude and frequency sinusoidal voltages. Therefore, the presence of the neutral wire is inevitable. A four-leg inverter is a common solution to connect DGs to stand-alone loads as well as providing the neutral wire. In this paper, by considering a filter inductor in the fourth (neutral) leg of the four-leg inverter, a detailed model is presented, which illustrates a strong coupling among different phases. In order to remove this coupling effect, it is proposed to transform the quantities from the abc to the αβγ reference frame. Furthermore, based on the proposed decoupled model, a new deadbeat control scheme is proposed to provide balanced sinusoidal voltages at the output of the inverter. To confirm the effectiveness of the proposed modeling and control techniques, experimental results on a 3-kW setup with the digital-signal-processor-based digital controller are provided under various loading conditions, such as linear/nonlinear, balanced/unbalanced, and single-/three-phase loads.