Modeling, Design, and Fabrication of High-Inductance Bond Wire Microtransformers With Toroidal Ferrite Core
| Autor: | Cian O Mathuna, Marco Tartagni, Michael Hayes, Saibal Roy, Ningning Wang, Aldo Romani, Rudi Paolo Paganelli, Enrico Macrelli |
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| Přispěvatelé: | Enrico Macrelli, Aldo Romani, Ningning Wang, Saibal Roy, Mike Haye, Rudi Paolo Paganelli, Cian O'Mathuna, Marco Tartagni |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
oscillators power supply in package (PwrSiP) printed circuits thermoelectric Inductor law.invention magnetic core energy harvesting (EH) law oscillator bonding wire magnetic printed circuit boards converters Bonding processes power supply on chip (PwrSoC) Electrical and Electronic Engineering Transformer Electrical impedance ferrites Electronic circuit magnetic permeability PCB business.industry magnetic cores Electrical engineering transformers Ferrite core Wire bonding Inductance ferrite ENERGY HARVESTING Optoelectronics Ferrite (magnet) step-up oscillator permeability business Coupling coefficient of resonators |
| Zdroj: | IEEE transactions on power electronics 30 (2015): 5724–5737. doi:10.1109/TPEL.2014.2370814 info:cnr-pdr/source/autori:Enrico Macrelli, Aldo Romani, Ningning Wang, Saibal Roy, Mike Hayes, Rudi Paolo Paganelli, Cian Ó Mathúna, Marco Tartagni/titolo:Modeling, Design, and Fabrication of High Inductance Bond Wire Micro-Transformers with Toroidal Ferrite Core/doi:10.1109%2FTPEL.2014.2370814/rivista:IEEE transactions on power electronics/anno:2015/pagina_da:5724/pagina_a:5737/intervallo_pagine:5724–5737/volume:30 |
| ISSN: | 1941-0107 0885-8993 |
| Popis: | This paper presents the design of miniaturized bond wire transformers assembled with standard IC bonding wires and NiZn and MnZn ferrite toroidal cores. Several prototypes are fabricated on a printed circuit board substrate with various layouts in a $4.95\; {\rm mm} \times 4.95\; {\rm mm}$ area. The devices are modeled by analytical means and characterized with impedance measurements over a wide frequency range. Experimental results on 1:38 device show that the secondary self-inductance increases from 0.3 μH with air-core to 315 μH with ferrite core; the coupling coefficient improves from 0.1 with air-core to 0.9 with ferrite core; the effective turns ratio enhances from 0.5 with air-core to 34 with ferrite core. This approach is cost effective and enables a flexible design of efficient micromagnetics on top of ICs with dc inductance to resistance ratio of 70 μH/Ω and an inductance per unit area of 12.8 μH/mm2 up to 0.3 MHz. The design targets the development of bootstrap circuits for ultralow voltage energy harvesting. In this context, a low-voltage step-up oscillator suitable for thermoelectric generator sources is realized with a commercial IC and the proposed microtransformers. Experimental measurements on a discrete prototype report that the circuit bootstraps from voltages down to 260 mV and outputs a dc voltage of 2 V. |
| Databáze: | OpenAIRE |
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