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.

Design and Implementation of Dimmable Electronic Ballast Based on Integrated Inductor

Abstract: This paper presents an implementation of integrated inductor for typical dimmable electronic ballasts having two power processing stages. The inductor used in the front-stage power factor corrector is integrated with the resonant inductor in the output-stage of the ballast inverter, so that the usage of the magnetic core material, and thus the cost, can be reduced. Existing circuit schematic can be retained without requiring any modification. Most importantly, the ballast performance is similar to the original design with two separate inductors. Based on using a z-parameter gyrator-capacitor model, modeling, design, and analysis of the ballast operation will be presented. A comparative study of using two separate inductors and integrated-inductor designs on the core volume, conduction and hysteresis losses, inductor current waveforms, input current harmonics, output lamp crest factor, overall efficiency, and costing will be carried out. Simplified design procedures will be given. The structure has been successfully applied to a 36-W prototype

High-Density Low-Profile Coupled Inductor Design for Integrated Point-of-Load Converters

Abstract: Low-profile integrated point-of-load (POL) converter is today's industry trend for portable electronic applications. Magnetics is the major challenge and bottleneck for achieving a low-profile high-power-density integrated POL. So, how to design a low-profile magnetic becomes one of the key technologies for integrated POL. Inverse coupling is one of the possible methods used to reduce inductor size due to the dc flux cancelling effect. Several integrated low-profile coupled inductor structures with different flux patterns (vertical flux and lateral flux) are proposed and studied in this paper based on low-temperature co-fired ceramics (LTCC) technology. Two LTCC coupled inductor prototypes are designed and fabricated to verify the theoretical analysis. A 1.5-MHz, 5-1.2 V, 40-A 3-D integrated buck converter with LTCC coupled inductor substrate is also fabricated. The peak efficiency of this integrated converter is as high as 89%. The power density of this integrated converter is as high as 680 W/in3, which is almost six times higher than today's industry products with the same current level.

A Three-Winding Coupled-Inductor DC–DC Converter Topology With High Voltage Gain and Reduced Switch Stress

Abstract: This paper presents a dc–dc boost converter topology for low input and high output voltage applications, such as photovoltaic systems, fuel cell systems, high-intensity discharge lamp, and electric vehicles. The suggested configuration consists of a three-winding coupled-inductor, a single switch and two hybrid voltage multiplier cells. Furthermore, two independent hybrid voltage multiplier cells are in parallel when the single switch S is turned on , and they are in series when the switch S is turned off . So, the advantages of the proposed converter structure are summarized as follows: 1) A coupled inductor with three windings is introduced in the presented converter structure. The two secondary windings of the coupled inductor are, respectively, used to form a hybrid multiplier cell on the one hand, on the other hand, it increases the control freedom of the voltage gain, enhances the utility rate of magnetic core and power density, and reduces the stress of power components to provide a stable constant dc output voltage. 2) The two hybrid multiplier cells can absorb synchronously the energy of stray inductance, which not only reduces the current stress of corresponding diodes, but also greatly alleviates the spike voltage of the main switch, which improves the efficiency. 3) The two hybrid multiplier cells are connected in series to supply power energy for the load, so the voltage gain is extended greatly due to this particular structure. Thus, low-voltage low-conduction-loss devices can be selected and the reverse-recovery currents within the diodes are inhibited. The operating principles and the steady state analyses of the proposed converter are discussed in detail. Finally, a test prototype has been implemented in the laboratory, and the simulated and experimental results show satisfactory agreement with the theoretical analysis.

Microfabricated inductors for 20 MHz Dc-Dc converters

Abstract: This paper presents the design and measured results for micro-fabricated inductors suitable for use in high frequency (> 10 MHz), low power (1 -2 W) dc-dc converters. The design has focused on maximizing inductor efficiency for a given converter specification. Inductors in the range of 100 nH to 300 nH have been fabricated and tested. The small signal measurements show a relatively flat inductance profile, with a 10% drop in inductance at 30 MHz. Inductance vs. dc bias current measurements show less than 15% decrease in inductance at 500 mA current. The performance of the micro-inductors have also been compared to a conventional wire-wound inductor in a 20 MHz dc-dc converter. The converter efficiency is shown to be approximately 4% lower when the micro-inductor is used compared to the when the wire- wound inductor is used. The peak efficiency of the micro-inductor in the converter is estimated to be approximately 93%.

Miniature multilayer spiral inductors for GaAs MMICs

Abstract: A model approach is presented for reducing the area consumed by MMIC (monolithic microwave integrated circuit) spiral inductors by exploiting a multilayer MMIC process. These spiral inductors can be designed to have inductance values as high as 20 nH but occupy areas of less than 0.1 mm/sup 2/. A simple analysis is presented to estimate the prime inductance, and the results of geometric optimization using a two-level electromagnetic field analysis are shown. A practical equivalent circuit has been developed together with a set of design equations. A miniaturized amplifier has been produced to demonstrate the successful application of the component. >