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.

High-Frequency Integrated Point-of-Load Converters: Overview

Abstract: This overview paper focuses on state-of-the-art technologies and trends toward the integration of point-of-load (POL) converters. This paper encompasses an extended survey of literature ranging from device technologies and magnetic materials to integration technologies and approaches. This paper is organized into three main sections. 1) Device technologies, including the trench MOSFET, lateral MOSFET, and gallium nitride (GaN) high electron mobility transistor, are discussed along with their intended applications. The critical role of device packaging to highfrequency integration is also assessed. 2) Magnetic materials: In recent years, a number of new magnetic materials have been explored to facilitate magnetic integration for high-frequency POL converters. These data are collected and organized to help selecting magnetic material for various frequency ranges. 3) Integration methods, which are defined with the focus on magnetic integration techniques and approaches. Two integration levels are classified, namely wafer level and package level. Detailed information is presented for each integration level to identify suitable current scale and frequency range. Three-dimensional integration, which uses magnetic component as a substrate, is one of the promising integration methods. By using an integrated GaN device and a low-profile low-temperature cofired ceramic inductor substrate, the power density of the latest 20-A 5-MHz 3-D integrated POL converter is demonstrated as high as 1100 W/in3, which is a factor of 10 improvements compared to industry products at the same current level.

Method and system for using a pulsed field to assist spin transfer induced switching of magnetic memory elements

Abstract: A method and system for providing and utilizing a magnetic memory are described. The magnetic memory includes a plurality of magnetic storage cells. Each magnetic storage cell includes magnetic element(s) programmable due to spin transfer when a write current is passed through the magnetic element(s) and selection device(s). The method and system include driving a first current in proximity to but not through the magnetic element(s) of a portion of the magnetic storage cells. The first current generates a magnetic field. The method and system also include driving a second current through the magnetic element(s) of the portion of the magnetic storage cells. The first and second currents are preferably both driven through bit line(s) coupled with the magnetic element(s). The first and second currents are turned on at a start time. The second current and the magnetic field are sufficient to program the magnetic element(s).

Microwave MEMS-based voltage-controlled oscillators

Abstract: A microwave voltage-controlled oscillator (VCO) based on coupled bonding wire inductors and microelectromechanical system (MEMS)-based variable capacitors for frequency tuning is demonstrated in this paper. The MEMS-based variable capacitors were fabricated in a standard polysilicon surface micromachining technology. The variable capacitors have a nominal capacitance of 1.4 pF and have a Q factor of 23 at 1 GHz and 14 at 2 GHz. The capacitance is variable from 1.4 to 1.9 pF as the tuning voltage is swept from 0 to 5 V. The VCO, fabricated in a 0.5 /spl mu/m CMOS technology, was assembled in a ceramic package where MEMS and CMOS dice were bonded together. The oscillator operates at 2.4 GHz, achieves a phase noise of -122 dBc/Hz at 1 MHz offset from the carrier, and exhibits a tuning range of 3.4%.

A Safety Enhanced, High Step-Up DC–DC Converter for AC Photovoltaic Module Application

Abstract: Within the photovoltaic (PV) power-generation market, the ac PV module has shown obvious growth. However, a high voltage gain converter is essential for the module's grid connection through a dc-ac inverter. This paper proposes a converter that employs a floating active switch to isolate energy from the PV panel when the ac module is off; this particular design protects installers and users from electrical hazards. Without extreme duty ratios and the numerous turns-ratios of a coupled inductor, this converter achieves a high step-up voltage-conversion ratio; the leakage inductor energy of the coupled inductor is efficiently recycled to the load. These features explain the module's high-efficiency performance. The detailed operating principles and steady-state analyses of continuous, discontinuous, and boundary conduction modes are described. A 15 V input voltage, 200 V output voltage, and 100 W output power prototype circuit of the proposed converter has been implemented; its maximum efficiency is up to 95.3% and full-load efficiency is 92.3%.

A Series-Tuned Inductive-Power-Transfer Pickup With a Controllable AC-Voltage Output

Abstract: This paper presents a new type of series ac-processing pickup used in inductive-power-transfer applications. The proposed pickup uses an ac switch operating under zero-current-switching conditions in series with a resonant network to produce a controllable ac voltage source suitable for driving incandescent lights. When a rectifier is cascaded onto this pickup, it can also produce a precisely controlled dc voltage. This topology eliminates the need to use an extra buck converter after the traditional series pickup for controlling the output load voltage to a desired value, which may be different from the induced voltage of the pickup. Furthermore, this pickup has the ability to control the inductor current directly, and hence, eliminate the transient inrush current at startup for the series-tuned resonant tank. The circuit is analytically analyzed and the maximum efficiency for a 1.2-kW prototype is measured to be 93%.