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Author = O'Donnell, Terence;
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Displaying Results 1 - 21 of 21 on page 1 of 1
Marked
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Analysis of virtual synchronous generator control and its response based on transfer functions
(2020)
Chen, Junru; O'Donnell, Terence
Analysis of virtual synchronous generator control and its response based on transfer functions
(2020)
Chen, Junru; O'Donnell, Terence
Abstract:
Virtual Synchronous Generator (VSG) control has been proposed as a means to control power electronics converter interfaced generation and storage which retains the dynamics of the conventional synchronous machine. This study provides a comprehensive, transfer function based, analysis of VGS control, which can be used as the basis for the design of VSG transient and steady-state performance. Based on a hardware validated, large signal model, a small signal model and associated transfer functions which describe the changes in real and reactive powers in response to changes in references and grid frequency disturbances. The derived transfer functions are used to obtain insight into the correct design of VSG controllers. The small signal models, transfer functions and associated analysis are validated by comparison with measured results on a scaled hardware system.
Science Foundation Ireland
ESIPP UCD
http://hdl.handle.net/10197/11479
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Assessment of Grid-Feeding Converter Voltage Stability
(2020)
Chen, Junru; Milano, Federico; O'Donnell, Terence
Assessment of Grid-Feeding Converter Voltage Stability
(2020)
Chen, Junru; Milano, Federico; O'Donnell, Terence
Abstract:
This letter applies voltage stability analysis to grid feeding converters in the presence of the converter stability versus the grid state and its operation. By applying this analysis, it is shown that the converter may become unstable if the converter reference power or current exceeds the line capacity. This letter proposes to use a conventional PV curve to determine the stability of the dynamic response of grid-feeding converters considering both power and current limits.
Science Foundation Ireland
http://hdl.handle.net/10197/11485
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Design considerations of sub-mW indoor light energy harvesting for wireless sensor systems
(2010)
Wang, Wensi S.; O'Donnell, Terence; Wang, Ningning; Hayes, Michael; O'Flynn, ...
Design considerations of sub-mW indoor light energy harvesting for wireless sensor systems
(2010)
Wang, Wensi S.; O'Donnell, Terence; Wang, Ningning; Hayes, Michael; O'Flynn, Brendan; Ó Mathúna, S. Cian
Abstract:
For most wireless sensor networks, one common and major bottleneck is the limited battery lifetime. The frequent maintenance efforts associated with battery replacement significantly increase the system operational and logistics cost. Unnoticed power failures on nodes will degrade the system reliability and may lead to system failure. In building management applications, to solve this problem, small energy sources such as indoor light energy are promising to provide long-term power to these distributed wireless sensor nodes. This paper provides comprehensive design considerations for an indoor light energy harvesting system for building management applications. Photovoltaic cells characteristics, energy storage units, power management circuit design and power consumption pattern of the target mote are presented. Maximum power point tracking circuits are proposed which significantly increase the power obtained from the solar cells. The novel fast charge circuit reduces the charging t...
http://hdl.handle.net/10468/380
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Design of VSC Connected Low Frequency AC Offshore Transmission with Long HVAC Cables
(2019)
Ruddy, Jonathan; Meere, Ronan; O'Loughlin, Cathal; O'Donnell, Terence
Design of VSC Connected Low Frequency AC Offshore Transmission with Long HVAC Cables
(2019)
Ruddy, Jonathan; Meere, Ronan; O'Loughlin, Cathal; O'Donnell, Terence
Abstract:
Low frequency ac transmission (LFAC) has been proposed as an alternative to high voltage dc transmission for medium distance (80-150 km) offshore wind farms. Long HVAC cables and their associated low frequency resonance, connected to voltage source converters (VSC), provide technical challenges for the control of the offshore voltage. This paper provides the design of the offshore voltage 'grid forming control' to maintain a stable offshore voltage accounting for the connection of a long HVAC cable connected to the VSC. Simulations are performed on an LFAC test system to examine the influence of controller parameters and the associated design tradeoffs between the selection of dq controller time constants and voltage control bandwidth. The LFAC system design and control is then validated in a hardware experiment where the proposed controller operates in a real-Time hardware-in-The-loop experiment.
Science Foundation Ireland
University College Dublin
Electricity...
http://hdl.handle.net/10197/10378
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Energy harvesting embedded wireless sensor system for building environment applications
(2009)
Wang, Wensi S.; O'Donnell, Terence; Ribetto, Luca; O'Flynn, Brendan; Hayes, M...
Energy harvesting embedded wireless sensor system for building environment applications
(2009)
Wang, Wensi S.; O'Donnell, Terence; Ribetto, Luca; O'Flynn, Brendan; Hayes, Michael; Ó Mathúna, S. Cian
Abstract:
For many wireless sensor networks applications, indoor light energy is the only ambient energy source commonly available. Many advantages and constraints co-exist in this technology. However, relatively few indoor light powered harvesters have been presented and much research remains to be carried out on a variety of related design considerations and trade-offs. This work presents a solution using the Tyndall mote and an indoor light powered wireless sensor node. It analyses design considerations on several issues such as indoor light characteristics, solar panel component choice, maximum power point tracking, energy storage elements and the trade-offs and choices between them.
http://hdl.handle.net/10468/159
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Energy scavenging for long-term deployable wireless sensor networks
(2007)
Ó Mathúna, S. Cian; O'Donnell, Terence; Martinez-Catala, Rafael V.; Rohan, James F...
Energy scavenging for long-term deployable wireless sensor networks
(2007)
Ó Mathúna, S. Cian; O'Donnell, Terence; Martinez-Catala, Rafael V.; Rohan, James F.; O'Flynn, Brendan
Abstract:
The coming decade will see the rapid emergence of low cost, intelligent, wireless sensors and their widespread deployment throughout our environment. While wearable systems will operate over communications ranges of less than a meter, building management systems will operate with inter-node communications ranges of the order of meters to tens of meters and remote environmental monitoring systems will require communications systems and associated energy systems that will allow reliable operation over kilometers. Autonomous power should allow wireless sensor nodes to operate in a “deploy and forget” mode. The use of rechargeable battery technology is problematic due to battery lifetime issues related to node power budget, battery self-discharge, number of recharge cycles and long-term environmental impact. Duty cycling of wireless sensor nodes with long “SLEEP” times minimises energy usage. A case study of a multi-sensor, wireless, building management system operating using the Zigbee...
http://hdl.handle.net/10468/7658
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Harmonic stability of VSC connected Low Frequency AC offshore transmission with long HVAC cables
(2019)
Ruddy, Jonathan; Chen, Junru; Meere, Ronan; O'Loughlin, Cathal; O'Donnell, Te...
Harmonic stability of VSC connected Low Frequency AC offshore transmission with long HVAC cables
(2019)
Ruddy, Jonathan; Chen, Junru; Meere, Ronan; O'Loughlin, Cathal; O'Donnell, Terence
Abstract:
Low Frequency AC (LFAC) transmission has been proposed as an alternative to HVDC transmission for the integration of offshore wind. The LFAC offshore grid as a fully power electronic grid with a long HVAC cable provides significant challenges to harmonic stability. This paper presents an impedance based stability analysis to determine the stability of the power electronic offshore system across the harmonic frequency range. The stability analysis is introduced and applied to the LFAC system. The impact of different current and voltage control bandwidths and component sizes on the dynamic impedance of the converters is then examined and their impact on harmonic stability of the LFAC grid is determined. It is found that detailed knowledge of the control parameters and the ability to tune the bandwidths can mitigate significant harmonic instability with the presence of a long HVAC cable. Three phase simulations are then used to validated the impedance based stability technique.
Sci...
http://hdl.handle.net/10197/10451
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Methodology for Assessment of the Impact of Smart Transformers on Power System Reliability
(2020)
Chen, Junru; Nouri, Alireza; Keane, Andrew; O'Donnell, Terence
Methodology for Assessment of the Impact of Smart Transformers on Power System Reliability
(2020)
Chen, Junru; Nouri, Alireza; Keane, Andrew; O'Donnell, Terence
Abstract:
The 45th Annual Conference of the IEEE Industrial Electronics Society (IECON'2019), Lisbon, Portugal, 14-17 October 2019
The smart transformer (ST) has been proposed as an alternative to the traditional low frequency transformer as a means to provide extra control functionality in the smart power system. The ST has merits in terms of reactive power decoupling and voltage decoupling at the primary and secondary side. This provides flexibility for reactive power compensation in the transmission system and demand reduction in the distribution system. Using its ability to control demand through voltage regulation, the ST provides the possibility to reduce demand while keeping the entire load online, which can provide an alternative to load curtailment. Thus, it may provide a means to improve power system reliability. However, no of previous research has investigated these potential system reliability benefits of the ST. The paper presents a methodology which can be used to quan...
http://hdl.handle.net/10197/11481
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Microfabricated inductors for 20 MHz dc-dc converters
(2008)
O'Donnell, Terence; Wang, Ningning; Meere, Ronan; Rhen, Fernando M.F.; Roy, Saibal...
Microfabricated inductors for 20 MHz dc-dc converters
(2008)
O'Donnell, Terence; Wang, Ningning; Meere, Ronan; Rhen, Fernando M.F.; Roy, Saibal; O'Sullivan, Denis; Ó Mathúna, Cian
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 wirewound inductor is used. The peak efficiency of the micro-inductor in the converter is estimated to be approximately 93%.
http://hdl.handle.net/10344/520
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Modelling, Simulation and Hardware-in-the-Loop Validation of Virtual Synchronous Generator Control in Low Inertia Power System
(2019)
Chen, Junru; Liu, Muyang; O'Loughlin, Cathal; Milano, Federico; O'Donnell, Te...
Modelling, Simulation and Hardware-in-the-Loop Validation of Virtual Synchronous Generator Control in Low Inertia Power System
(2019)
Chen, Junru; Liu, Muyang; O'Loughlin, Cathal; Milano, Federico; O'Donnell, Terence
Abstract:
20th Power Systems Computation Conference (PSCC), University College Dublin, Ireland, 11-15 June 2018
In recent literature, virtual synchronous generator control (VSG) has been proposed as a means to provide virtual inertia from non-synchronous generation in low inertia power systems. In this work we compare the power system support performance of VSG control to conventional droop when applied to electrical energy storage. A differential-algebraic equations (DAEs) model of VSG control is developed. This model is validated against measurement from a hardware in the loop implementation of the VSG. VSG and droop controlled storage is then incorporated into the IEEE 39 bus system model also incorporating different levels of generation from windfarms. The performance of both controls is compared in terms of their effect on the power system dynamics in the event of a contingency. The results show that VSG control in high wind penetration cases, improves the frequency nadir, reduces os...
http://hdl.handle.net/10197/10510
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Neutral Current Minimization Control for Solid State Transformers under Unbalanced Loads in Distribution Systems
(2019)
Chen, Junru; Yang, Tao; O'Loughlin, Cathal; O'Donnell, Terence
Neutral Current Minimization Control for Solid State Transformers under Unbalanced Loads in Distribution Systems
(2019)
Chen, Junru; Yang, Tao; O'Loughlin, Cathal; O'Donnell, Terence
Abstract:
This paper analyses the neutral current reduction performance of a three phase four leg solid state transformer (SST) under different degrees of unbalanced load. Several kinds of control strategies are presented, the neutral current elimination controls which rely on phase shifting, voltage amplitude and phase shifting & voltage amplitude combination control. A neutral current minimization control which ensures the SST output voltages complies with the EN 50160 output voltage unbalance standard is also developed. These control approaches simply build on the balanced voltage control providing voltage references which slightly unbalanced the voltage amplitude and phase angle or both. The effectiveness of the proposed strategies is validated through tests on a downscaled prototype. Simulation results for the neutral current minimization control of the SST applied to a real urban distribution network with distributed loads are presented. The results of this analysis show that overal...
http://hdl.handle.net/10197/10662
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Neutral current reduction control for smart transformer under the imbalanced load in distribution system
(2019)
Chen, Junru; Zhu, Rongwu; Liserre, Marco; O'Donnell, Terence
Neutral current reduction control for smart transformer under the imbalanced load in distribution system
(2019)
Chen, Junru; Zhu, Rongwu; Liserre, Marco; O'Donnell, Terence
Abstract:
The 13th IEEE Conference on Industrial Electronics and Applications (ICIEA 2018), Wuhan, China, 31 May-2 June 2018
Imbalanced loads arouse neutral current looping in the distribution system, which increases power loss and results in neutral potential variation. Compared to the conventional power transformer, the smart transformer (ST) has advantages on the downstream voltage regulation. Thus, this paper proposes a voltage control strategy based on ST to reduce the LV grid neutral current according with EN 50160 imbalanced voltage standard. The proposed control has been validated in the Matlab/Simulink, and the system performance under the proposed control has been simulated under the imbalanced loading profile in a 400 kVA, 10 kV/400 V distribution network. The results prove the proposed control can practically reduce the neutral current.
European Research Council
Science Foundation Ireland
Energy Systems Integration Partnership Programme (ESIPP) Project
http://hdl.handle.net/10197/10459
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Parameter Constraints for Virtual Synchronous Generator Considering Stability
(2020)
Chen, Junru; O'Donnell, Terence
Parameter Constraints for Virtual Synchronous Generator Considering Stability
(2020)
Chen, Junru; O'Donnell, Terence
Abstract:
A virtual synchronous generator (VSG) control for converters has been proposed as a method to provide virtual inertia from power electronics connected generation and storage. Most works to date have analyzed VSG control under the assumption that the VSG dynamics are much slower than that the converter. This work shows that when converter and line dynamics are taken into account, the virtual inertia and damping settings are constrained by stability considerations. These conditions for stability are analyzed based on a simple transfer function approach. It is shown that for the VSG to be stable and validly approximated by a second-order system, the ratio of damping to virtual inertia is a key parameter. This letter quantifies how these VSG parameters are constrained by stability. The transfer function analysis is validated using full switching model simulations of stable and unstable cases.
Science Foundation Ireland
ESIPP UCD
http://hdl.handle.net/10197/11484
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Placement of Virtual Synchronous Generator Controlled Electric Storage combined with Renewable Generation
(2020)
Chen, Junru; Liu, Muyang; Milano, Federico; O'Donnell, Terence
Placement of Virtual Synchronous Generator Controlled Electric Storage combined with Renewable Generation
(2020)
Chen, Junru; Liu, Muyang; Milano, Federico; O'Donnell, Terence
Abstract:
The virtual synchronous generator (VSG) control of power converters has been proposed to improve the system inertia. The commonly used VSG requires an energy storage (ESS) to provide the emulated inertia power and the frequency droop power. The placement of the ESS can be either in the DC port of the power electronics generation or co-located with the power electronics generation on the AC side. In the former case, the VSG control makes the total generator behave like a synchronous generator, while in the latter one, the VSG control only regulates the ESS in response to the grid frequency. The different placement of the ESS gives rise to different performance. This paper analyzes this performance firstly by means of simple transfer function analysis and secondly by comparing their effects on the grid frequency at the system level in the IEEE 39 bus test system. The results show that the placement of the ESS has no impact on the system transient stability while it has a significant i...
http://hdl.handle.net/10197/11483
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Precessional dynamics of Ni45Fe55 thin films for ultrahigh frequency integrated magnetics
(2010)
Godsell, Jeffrey F.; Kulkarni, Santosh; O'Donnell, Terence; Roy, Saibal
Precessional dynamics of Ni45Fe55 thin films for ultrahigh frequency integrated magnetics
(2010)
Godsell, Jeffrey F.; Kulkarni, Santosh; O'Donnell, Terence; Roy, Saibal
Abstract:
Future monolithic point of load switched mode power supplies will be expected to meet the energy requirements of miniaturized, high functionality electronic devices. Recently, Ni45Fe55 has emerged as a potentially important material choice for use as a soft magnetic core material within high frequency integrated passive magnetic components. The operating frequency range of the integrated passives which form a key part of the point of load power supply must increase to allow for inductor/transformer miniaturization to become monolithic with power integrated circuits. In this work, an analysis of the high frequency permeability spectra of an electroplated Ni45Fe55 thin film has been carried out to quantitatively analyze the material's high frequency performance. Complex permeability spectra of the film have been investigated at frequencies up to 9 GHz to identify both the film's spectroscopic splitting factor (g) and its effective dimensionless damping parameter (alpha). The...
http://hdl.handle.net/10468/4747
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Shape-independent permeability model for uniaxially-anisotropic ferromagnetic thin films
(2010)
Jamieson, Brice; O'Donnell, Terence; Kulkarni, Santosh; Roy, Saibal
Shape-independent permeability model for uniaxially-anisotropic ferromagnetic thin films
(2010)
Jamieson, Brice; O'Donnell, Terence; Kulkarni, Santosh; Roy, Saibal
Abstract:
A permeability model based on the three-dimensional shape demagnetization effect is developed to estimate the permeability of any uniaxially-anisotropic ferromagnetic thin-film for integrated micromagnetic structures. The model is validated by comparison to measured ferromagnetic thin films (NiFe and CoPRe) with different anisotropies and saturation magnetizations. The dependence of permeability on film-thickness is modeled as a function of the demagnetization effect and verified against fabricated samples of varying thicknesses. (C) 2010 American Institute of Physics. (doi: 10.1063/1.3430061)
http://hdl.handle.net/10468/4342
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Smart Transformer and Low Frequency Transformer Comparison on Power Delivery Characteristics in the Power System
(2019)
Chen, Junru; Zhu, Rongwu; O'Donnell, Terence; Liserre, Marco
Smart Transformer and Low Frequency Transformer Comparison on Power Delivery Characteristics in the Power System
(2019)
Chen, Junru; Zhu, Rongwu; O'Donnell, Terence; Liserre, Marco
Abstract:
AEIT 2018 International Annual Conference, Bari, Italy, 3-5 October 2018
Smart transformer is a power electronics-based transformer, offering voltage regulation and DC connectivity. As a transformer, its basic function is still power delivery. Smart transformer with advanced controls can support MV gird voltage by absorbing/injecting reactive power while actively regulate the LV grid voltage. Due to the controllable voltage in both MV and LV side, the power delivery of smart transformer is flexible. This paper focuses on the power delivery characteristic of smart transformer and compares with the conventional low frequency transformer with the help of STACTOM at its primary side or on load tap changer at its secondary side, in the power system by means of maximum deliverable power and power-voltage curve analysis. The Simulink results validate that the smart transformer improves system voltage stability compared to the traditional low frequency transformer with load tap changer....
http://hdl.handle.net/10197/10566
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Smart Transformer for the Provision of Coordinated Voltage and Frequency Support in the Grid
(2019)
Chen, Junru; Zhu, Rongwu; Liu, Muyang; Milano, Federico; O'Donnell, Terence; et al.
Smart Transformer for the Provision of Coordinated Voltage and Frequency Support in the Grid
(2019)
Chen, Junru; Zhu, Rongwu; Liu, Muyang; Milano, Federico; O'Donnell, Terence; et al.
Abstract:
IECON 2018: 44th Annual Conference of the IEEE Industrial Electronics Society, Washington, United States of America, 20-23 October 2018
Considering the increase in renewable generation and the consequent reduction in power system inertia, the Virtual Synchronous Machine (VSM) control method has been proposed to control power converters to emulate the inertia and other the characteristics of the synchronous machine. However, to achieve the function of VSM control, an extra energy base, typically storage, is required to connect to the controlled converter. In this work we investigate the application of the VSM control to the distribution system demand through the use of a VSM controlled smart transformer. Through control of the demand in this way, the demand itself can be used to emulate inertia and provide frequency support. This paper presents the details of the flexible demand control applied to a smart transformer supplying a low voltage distribution grid. The operation of the...
http://hdl.handle.net/10197/10599
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Smart transformer Modelling in Optimal Power Flow Analysis
(2020)
Chen, Junru; Li, Ran; Soroudi, Alireza; Keane, Andrew; Flynn, Damian; O'Donnell, T...
Smart transformer Modelling in Optimal Power Flow Analysis
(2020)
Chen, Junru; Li, Ran; Soroudi, Alireza; Keane, Andrew; Flynn, Damian; O'Donnell, Terence
Abstract:
The 45th Annual Conference of the IEEE Industrial Electronics Society, Lisbon, Portugal, 14-17 October 2019
The smart transformer (ST) implemented using power electronics converters, has the capability of independent voltage control and reactive power isolation between its primary and secondary terminals. This capability provides a flexibility in the power system to support the voltage at the primary side and control the demand at the secondary side. Using this flexibility, the system power flow could, for example, be optimized for lower costs. This paper proposes an ST model suitable for OPF analysis. The effects of using multiple STs at different penetration levels, on the daily generation costs in an IEEE 39 bus test system are presented.
Science Foundation Ireland
ESIPP UCD
http://hdl.handle.net/10197/11482
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Thin-film-integrated power inductor on Si and its performance in an 8-MHz buck converter
(2008)
Wang, Ningning; O'Donnell, Terence; Meere, Ronan; Rhen, Fernando M. F.; Ó Mathúna,...
Thin-film-integrated power inductor on Si and its performance in an 8-MHz buck converter
(2008)
Wang, Ningning; O'Donnell, Terence; Meere, Ronan; Rhen, Fernando M. F.; Ó Mathúna, S. Cian; Roy, Saibal
Abstract:
This paper presents a microinductor fabricated on silicon using electrochemical techniques that has high efficiency in a low power dc–dc converter. Small signal measurements show a flat frequency response up to 20 MHz with a self resonant frequency of 130 MHz. The inductance at low frequency is approximately 440 nH with a dc resistance of 0.5 Ω, and a high quality factor of 11.7 at 5.5 MHz. The current handling capability test shows less than 10% decrease in inductance at 500-mA current. The performance of the microinductor has been compared to a conventional chip inductor in a commercially available 8-MHz buck converter. The converter maximum efficiency when using the microinductor is shown to be approximately 3% lower than the one using the conventional discrete chip inductor. However, the profile of the microinductor is much lower than that of the discrete chip inductor. The maximum efficiency of the microinductor in the converter is estimated to be approximately 92%.
http://hdl.handle.net/10468/46
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Vibration based electromagnetic micropower generator on silicon
(2006)
Kulkarni, Santosh; Roy, Saibal; O'Donnell, Terence; Beeby, S.; Tudor, J.
Vibration based electromagnetic micropower generator on silicon
(2006)
Kulkarni, Santosh; Roy, Saibal; O'Donnell, Terence; Beeby, S.; Tudor, J.
Abstract:
This paper discusses the theory, design and simulation of electromagnetic micropower generators with electroplated micromagnets. The power generators are fabricated using standard microelectromechanical system processing techniques. Electromagnetic two-dimensional finite element anlysis simulations are used to determine voltage and power that can be generated from different designs. This paper reports a maximum voltage and power of 55 mV and 70 mu W for the first design, incorporating microfabricated two-layer Cu coils on a Si paddle vibrating between two sets of oppositely polarized electroplated Co50Pt50 face centered tetragonal phase hard magnets. A peak voltage and power of 950 mV and 85 mu W are obtained for the second design, which includes electroplated Ni45Fe55 as a soft magnetic layer underneath the hard magnets. The volume of the device is about 30 mm(3).
http://hdl.handle.net/10468/4230
Displaying Results 1 - 21 of 21 on page 1 of 1
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University College Cork (7)
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Other (7)
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Peer-reviewed (8)
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2020 (6)
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