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In this paper, design and implementation of a sinusoidal flux controller has been proposed for a core loss tester for eliminating the higher order harmonics from the flux passing through the core. The core loss test is performed with a toroidal transformer that consists of a main and sense windings wound on a toroidal core. The flux through the core is calculated with the numerical integration of...
To efficiently power multi-core processors in today's computing devices, integrated voltage regulator (IVR) shows significant energy saving ability by dynamic voltage and frequency scaling. One key aspect in developing IVR is to design power inductors with small size and small loss at very high frequency. However, the challenge in very high frequency magnetic characterization is a major obstacle to...
The iron losses of three-phase inductor used in a three-phase pulse-width modulation (PWM) inverter are evaluated. First we clarify three-phase inductor design in order to make same inductance value between the each phase. Then based on the design, iron losses for various structure of inductor are simulated. Simulation result shows the iron loss can be reduced about 5% by changing structure from conventional...
This paper presents a charging strategy to minimize losses in a lithium-ion polymer battery for an electric vehicle. The proposed charging method which considers the variation of battery internal impedance according to state of charge and C-rate significantly reduces charging losses. Experiment results for a cell prove that the proposed charging method reduces loss by 41.9 % compared to a conventional...
A general-purpose clocked gate driver (CGD) IC to generate an arbitrary gate waveform is proposed to provide a universal platform for fine-grained gate waveform optimization handling various power transistors. The fabricated IC with 0.18µm BCD process has 63 PMOS and 63 NMOS driver transistors on a chip whose activation patterns are controlled by 6-bit digital signals and 25-MHz clock (= 40-ns time...
In multiphase buck converters, phases are dynamically added or dropped based on the output load, to improve efficiency. This is typically achieved by programming a lookup table containing the range of threshold currents for each phase, independent of input voltage and switching frequency. In this work, an algorithm is proposed to recalibrate the threshold currents for operation at optimum number of...
The thermal network parameters of IGBT module are wildly used for reliability evaluation, lifetime calculation, health monitoring, and predictive maintenance. Commonly used thermal network parameter identification methods include the finite element method (FEM) and the curve fitting of thermal impedance (Zth) method. The former method calculates directly using the IGBT geometric structure and material...
This paper presents the design, fabrication, and characterization of on silicon integrated micro-transformers for high frequency power applications. The microtransformer device is used and tested in DC-DC converter application at high switching frequency. This device has stable L vs. f characteristic up to 50 MHz. The design is improved regarding to the electrical resistance and current capability...
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