Relevant bibliographies by topics / Planar transformers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Planar transformers'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 June 2025

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Journal articles on the topic "Planar transformers"

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Shen, Zhan, Bingxin Xu, Chenglei Liu, Cungang Hu, Bi Liu, Zhike Xu, Long Jin, and Wu Chen. "The Modeling and Simplification of a Thermal Model of a Planar Transformer Based on Internal Power Loss." Sustainability 14, no. 19 (September 21, 2022): 11915. http://dx.doi.org/10.3390/su141911915.

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With the development of high-performance wide-band-gap devices and increasing converter frequency, planar transformers are widely used in high-frequency and high-power-density power conversions. Due to the skin effect and proximity effect, accurate thermal analysis and a simplified thermal model of planar transformers are needed for quick thermal verification as well as system design. This paper proposes two thermal simplification models based on the planar transformer’s thermal impedance network. The internal power loss and thermal coupling between each component are first analyzed. Then, based on thermal radiation theory, the simplified thermal model of the planar transformer is presented. It only requires the input of the total power loss of the planar transformer to calculate the temperature rise, and it does not need the power loss of each component. Finally, the simulation and experimental verification are carried out on a MHz prototype.
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Tan, Chang, Jianxun Hong, Zihao Wu, Qiuyuan Huang, and Cheng Wang. "Parasitic Parameter Prediction for Planar Transformers Based on Neural Network." Journal of Physics: Conference Series 2584, no. 1 (September 1, 2023): 012083. http://dx.doi.org/10.1088/1742-6596/2584/1/012083.

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Abstract Parasitic parameters such as leakage inductance and distributed capacitance of planar transformers have a direct impact on the performance and efficiency of transformers. Traditional methods for parasitic parameter prediction are commonly based on empirical formulas or simulation software, but they have problems of high computational complexity, time-consuming and low accuracy. In this paper, a method for predicting parasitic parameters of planar transformers based on a multilayer perceptron (MLP) under a specific winding structure is proposed, which can improve the efficiency of transformer design. The experiments demonstrate that the model can effectively predict the leakage inductance, distributed capacitance, and AC loss of planar transformers.
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Son, Won-Jin, and Byoung Kuk Lee. "Design of Planar Transformers for LLC Converters in High Power Density On-Board Chargers for Electric Vehicles." Energies 16, no. 18 (September 21, 2023): 6757. http://dx.doi.org/10.3390/en16186757.

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This article presents a planar transformer design and optimization method for high power density on-board chargers (OBCs) utilized in electric vehicles (EVs). Owing to considerations of electrical safety, OBCs require an isolated converter, leading to a substantial increase in volume due to the inclusion of a transformer. To address this issue and achieve high power density, a planar transformer is used, and an optimized design method is proposed for pattern arrangement, width, and core shape. The feasibility of the design is verified through the development of a 3.3 kW OBC prototype. Consequently, when compared to conventional transformers, the design method in this article results in a 27% reduction in the transformer’s height and a 20% reduction in its overall volume. This reduction is advantageous for meeting the requirements of high power density OBCs.
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V., Bharatidevi. "Applications of Transformers in Electronics: Advancements and Innovations." Recent Trends in Thermodynamics and Thermal Energy System 1, no. 1 (February 11, 2025): 1–4. https://doi.org/10.5281/zenodo.14849668.

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<em>Transformers play a pivotal role in modern electronics, facilitating efficient power distribution, signal processing, and voltage regulation across various applications. This paper explores the diverse applications of transformers in electronics, including power supply design, impedance matching, isolation, and noise reduction. Special emphasis is given to recent advancements in high-frequency transformers, planar transformers, and AI-driven optimization of transformer performance. The study also discusses the role of transformers in emerging technologies such as renewable energy systems, wireless power transfer, and miniaturized electronic circuits. The findings highlight the ongoing innovations and the future potential of transformer technology in enhancing electronic systems' efficiency and reliability.</em>
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Zhao, Bin, and Gang Wang. "Equivalent Circuit of a Planar Transformer Used for TWTA." Applied Mechanics and Materials 644-650 (September 2014): 3564–67. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3564.

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In this paper, application of planar transformers in TWTA (Travelling-wave Tube Amplifier) is investigated and a method of equivalent circuit is used to study performance of planar transformers. The lumped parameters of planar transformers are extracted by FEM (Finite Element Method).
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Dezuari, O., S. E. Gilbert, E. Belloy, and M. A. M. Gijs. "High inductance planar transformers." Sensors and Actuators A: Physical 81, no. 1-3 (April 2000): 355–58. http://dx.doi.org/10.1016/s0924-4247(99)00110-7.

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Benamer, Kahina, Azzedine Hamid, Eugenia Rossi di Schio, Abderrahim Mokhefi, Rabia Melati, and Paolo Valdiserri. "Magnetic and Thermal Behavior of a Planar Toroidal Transformer." Energies 17, no. 11 (May 21, 2024): 2454. http://dx.doi.org/10.3390/en17112454.

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This paper presents a study on the magnetic and thermal behaviors of a planar toroidal transformer, comprising two planar toroidal coils. In our configuration, the primary coil consists of twenty turns, while the secondary coil consists of ten turns. This design combines the advantages of both toroidal and planar transformers: it employs flat coils, akin to those utilized in planar transformers, while retaining a toroidal shape for its magnetic core. This combination enables leveraging the distinctive characteristics of both transformer types. This study delves into electromagnetic and thermal behaviors. Electromagnetic behavior is elucidated through Maxwell’s equations, offering insights into the distribution of magnetic fields, potentials, and electric current densities. Fluid flow is modeled via the Navier–Stokes equations. By coupling these equation sets, a more comprehensive and accurate portrayal of the thermal phenomena surrounding electrical equipment is attained. Such research is invaluable in the design and optimization of electrical systems, empowering engineers to forecast and manage thermal effects more efficiently. Consequently, this aids in enhancing the reliability, durability, and performance optimization of electrical equipment. The mathematical model was solved using the finite element method integrated into the COMSOL Multiphysics software v. 6.0. The COMSOL Multiphysics simulation showed correct behavior of potential, electric field, current density, and uniformly distributed temperature. In addition, this planar toroidal coil transformer model offers many advantages, such as small dimensions, high resonance frequency, and high operating reliability. This study made it possible to identify the range of its optimal functioning.
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Morrill, M. A., V. A. Caliskan, and C. Q. Lee. "High-frequency planar power transformers." IEEE Transactions on Power Electronics 7, no. 3 (July 1992): 607–13. http://dx.doi.org/10.1109/63.145149.

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Makki, Loreine, Marc Anthony Mannah, Christophe Batard, Nicolas Ginot, and Julien Weckbrodt. "Investigating the Shielding Effect of Pulse Transformer Operation in Isolated Gate Drivers for SiC MOSFETs." Energies 14, no. 13 (June 27, 2021): 3866. http://dx.doi.org/10.3390/en14133866.

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Wide-bandgap technology evolution compels the advancement of efficient pulse-width gate-driver devices. Integrated enhanced gate-driver planar transformers are a source of electromagnetic disturbances due to inter-winding capacitances, which serve as a route to common-mode(CM) currents. This paper will simulate, via ANSYS Q3D Extractor, the unforeseen parasitic effects of a pulse planar transformer integrated in a SiC MOSFET gate-driver card. Moreover, the pulse transformer will be ameliorated by adding distinctive shielding layers aiming to suppress CM noise effects and endure high dv/dt occurrences intending to validate experimental tests. The correlation between stray capacitance and dv/dt immunity results after shielding insertion will be reported.
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Górecki, Krzysztof, Kalina Detka, and Krzysztof Górski. "Compact Thermal Model of the Pulse Transformer Taking into Account Nonlinearity of Heat Transfer." Energies 13, no. 11 (June 1, 2020): 2766. http://dx.doi.org/10.3390/en13112766.

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This paper presents a compact nonlinear thermal model of pulse transformers. The proposed model takes into account differentiation in values of the temperatures of a ferromagnetic core and each winding. The model is formulated in the form of an electric network realising electrothermal analogy. It consists of current sources representing power dissipated in the core and in each of the windings, capacitors representing thermal capacitances and controlled current sources modelling the influence of dissipated power on the thermal resistances in the proposed model. Both self-heating phenomena in each component of the transformer and mutual thermal couplings between each pair of these components are taken into account. A description of the elaborated model is presented, and the process to estimate the model parameters is proposed. The proposed model was verified experimentally for different transformers. Good agreement between the calculated and measured waveforms of each component temperature of the tested pulse transformers was obtained. Differences between the results of measurements and calculations did not exceed 9% for transformers with a toroidal core and 13% for planar transformers.
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Dissertations / Theses on the topic "Planar transformers"

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Ambatipudi, Radhika. "High Frequency (MHz) Planar Transformers for Next Generation Switch Mode Power Supplies." Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20270.

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Increasing the power density of power electronic converters while reducing or maintaining the same cost, offers a higher potential to meet the current trend inrelation to various power electronic applications. High power density converters can be achieved by increasing the switching frequency, due to which the bulkiest parts, such as transformer, inductors and the capacitor's size in the convertercircuit can be drastically reduced. In this regard, highly integrated planar magnetics are considered as an effective approach compared to the conventional wire wound transformers in modern switch mode power supplies (SMPS). However, as the operating frequency of the transformers increase from several hundred kHz to MHz, numerous problems arise such as skin and proximity effects due to the induced eddy currents in the windings, leakage inductance and unbalanced magnetic flux distribution. In addition to this, the core losses whichare functional dependent on frequency gets elevated as the operating frequency increases. Therefore, this thesis provides an insight towards the problems related to the high frequency magnetics and proposes a solution with regards to different aspects in relation to designing high power density, energy efficient transformers.The first part of the thesis concentrates on the investigation of high power density and highly energy efficient coreless printed circuit board (PCB) step-down transformers useful for stringent height DC-DC converter applications, where the core losses are being completely eliminated. These transformers also maintain the advantages offered by existing core based transformers such as, high coupling coefficient, sufficient input impedance, high energy efficiency and wide frequencyband width with the assistance of a resonant technique. In this regard, several coreless PCB step down transformers of different turn’s ratio for power transfer applications have been designed and evaluated. The designed multilayered coreless PCB transformers for telecom and PoE applications of 8,15 and 30W show that the volume reduction of approximately 40 - 90% is possible when compared to its existing core based counterparts while maintaining the energy efficiency of the transformers in the range of 90 - 97%. The estimation of EMI emissions from the designed transformers for the given power transfer application proves that the amount of radiated EMI from a multilayered transformer is lessthan that of the two layered transformer because of the decreased radius for thesame amount of inductance.The design guidelines for the multilayered coreless PCB step-down transformer for the given power transfer application has been proposed. The designed transformer of 10mm radius has been characterized up to the power level of 50Wand possesses a record power density of 107W/cm3 with a peak energy efficiency of 96%. In addition to this, the design guidelines of the signal transformer fordriving the high side MOSFET in double ended converter topologies have been proposed. The measured power consumption of the high side gate drive circuitvitogether with the designed signal transformer is 0.37W. Both these signal andpower transformers have been successfully implemented in a resonant converter topology in the switching frequency range of 2.4 – 2.75MHz for the maximum load power of 34.5W resulting in the peak energy efficiency of converter as 86.5%.This thesis also investigates the indirect effect of the dielectric laminate on the magnetic field intensity and current density distribution in the planar power transformers with the assistance of finite element analysis (FEA). The significanceof the high frequency dielectric laminate compared to FR-4 laminate in terms of energy efficiency of planar power transformers in MHz frequency region is also explored.The investigations were also conducted on different winding strategies such as conventional solid winding and the parallel winding strategies, which play an important role in the design and development of a high frequency transformer and suggested a better choice in the case of transformers operating in the MHz frequency region.In the second part of the thesis, a novel planar power transformer with hybrid core structure has been designed and evaluated in the MHz frequency region. The design guidelines of the energy efficient high frequency planar power transformerfor the given power transfer application have been proposed. The designed corebased planar transformer has been characterized up to the power level of 50W and possess a power density of 47W/cm3 with maximum energy efficiency of 97%. This transformer has been evaluated successfully in the resonant converter topology within the switching frequency range of 3 – 4.5MHz. The peak energy efficiency ofthe converter is reported to be 92% and the converter has been tested for the maximum power level of 45W, which is suitable for consumer applications such as laptop adapters. In addition to this, a record power density transformer has been designed with a custom made pot core and has been characterized in thefrequency range of 1 - 10MHz. The power density of this custom core transformer operating at 6.78MHz frequency is 67W/cm3 and with the peak energy efficiency of 98%.In conclusion, the research in this dissertation proposed a solution for obtaining high power density converters by designing the highly integrated, high frequency(1 - 10MHz) coreless and core based planar magnetics with energy efficiencies inthe range of 92 - 97%. This solution together with the latest semiconductor GaN/SiC switching devices provides an excellent choice to meet the requirements of the next generation ultra flat low profile switch mode power supplies (SMPS).
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Mui, Andrew K. "A 20 dBm 5-14 GHz power amplifier with integrated planar transformers in SiGe." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43071.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (leaves 73-74).<br>The integration of radar systems has taken a long journey into the modern world. Advances in signal processing technology and integrated circuit technology have lead the way for smaller, more integrated radar systems. Specific to the hardware side of a radar, the RF generation and detection once done in one location in the radar is now being replaced by small sub-elements which combine RF generation and detection at the element level. This work describes a power amplifier that can be used at the element level. The design methodology for a single stage amplifier in a Silicon Germanium Bipolar process covering 5-14 GHz is discussed. Simulation results and measurement results closely match and show peak power outputs of 25 dBm and peak power-added efficiencies (PAE) of approximately 32 %.<br>by Andrew K. Mui.<br>S.M.
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Rocha, Fabio Dalla Vecchia. "Carregador de baterias bidirecional com tranformador planar." Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/653.

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CAPES<br>Este trabalho traz um estudo da aplicação do conversor Full-Bridge bidirecional como um carregador de banco de baterias em um barramento CC de fontes de energia renováveis. O problema principal destas fontes é que são sazonais e não oferecem uma continuidade de fornecimento de potência. Assim, o uso de banco de baterias, conectado a um barramento CC compartilhado com outras fontes renováveis traz contribuições na continuidade do fornecimento de energia. O conversor proposto neste trabalho visa conectar o banco de baterias ao barramento CC e ao mesmo tempo que faz a integração dos modos de carga e descarga em um único conversor. Adicionalmente, para reduzir volume, é utilizado um transformador planar que oferece alta eficiência (máximo de 99,5%) e uma reduzida relação volume/potência. O conversor foi desenvolvido para carregar um banco de baterias de 192V. No modo de descarga, ele é suado para alimentar um barramento CC de 400V com uma potência máxima de 1,34kW. Apesar do uso do conversor full-bridge não ser novidade nestes tipos de aplicação, dois fatores serviram de motivação para este trabalho: o uso do transformador planar e a tendência mundial de integração de fontes renováveis.<br>This work presents a study of the application of the Full-bridge bidirectional DC converter as a battery bank charger in a DC bus of renewable energy sources. The main problem is that these sources are seasonal and do not offer a continuously power supply. Thus, the use of a battery bank connected to a DC bus shared with other renewable sources brings contributions in the continuity of power supply. The converter proposed in this work aims to connect the battery bank to the DC bus at the same time it integrates the charging and discharging modes into a single converter. Additionally, to reduce the volume, it is used a planar transformer that provides high efficiency (up to 99.5%) and a reduced volume/power ratio. The converter is designed to charge a bank of batteries of 192V. At the discharge mode, it is designed to feed a 400V DC bus with maximum power of 1.34 kW. Despite the use of the full-bridge converter is not new in these types of application, two factors served as motivation for this work: the use of planar transformer and the global trend of integration of renewable sources.
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Wong, Fu Keung, and n/a. "High Frequency Transformer for Switching Mode Power Supplies." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050211.110915.

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A power supply is an essential part of all electronic devices. A switching mode power supply is a light weight power solution for most modern electronic equipment. The high frequency transformer is the backbone of modern switched mode power supplies. The skin effect and proximity effects are major problems in high frequency transformer design, because of induced eddy currents. These effects can result in transformers being destroyed and losing their power transferring function at high frequencies. Therefore, eddy currents are unwanted currents in high frequency transformers. Leakage inductance and the unbalanced magnetic flux distribution are two further obstacles for the development of high frequency transformers. Winding structures of power transformers are also a critical part of transformer design and manufacture, especially for high frequency applications. A new planar transformer with a helical winding structure has been designed and can maintain the advantages of existing planar transformers and significantly reduce the eddy currents in the windings. The maximum eddy current density can be reduced to 27% of the density of the planar transformer with meander type winding structure and 33% of the density of the transformer with circular spiral winding structure at an operating frequency of 1MHz. The voltage ratio of the transformer with helical winding structure is effectively improved to 150% of the voltage ratio of the planar transformer with circular spiral coils. With the evenly distributed magnetic flux around the winding, the planar transformer with helical winding structure is excellent for high frequency switching mode power supplies in the 21st Century.
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Wong, Fu Keung. "High Frequency Transformer for Switching Mode Power Supplies." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367650.

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A power supply is an essential part of all electronic devices. A switching mode power supply is a light weight power solution for most modern electronic equipment. The high frequency transformer is the backbone of modern switched mode power supplies. The skin effect and proximity effects are major problems in high frequency transformer design, because of induced eddy currents. These effects can result in transformers being destroyed and losing their power transferring function at high frequencies. Therefore, eddy currents are unwanted currents in high frequency transformers. Leakage inductance and the unbalanced magnetic flux distribution are two further obstacles for the development of high frequency transformers. Winding structures of power transformers are also a critical part of transformer design and manufacture, especially for high frequency applications. A new planar transformer with a helical winding structure has been designed and can maintain the advantages of existing planar transformers and significantly reduce the eddy currents in the windings. The maximum eddy current density can be reduced to 27% of the density of the planar transformer with meander type winding structure and 33% of the density of the transformer with circular spiral winding structure at an operating frequency of 1MHz. The voltage ratio of the transformer with helical winding structure is effectively improved to 150% of the voltage ratio of the planar transformer with circular spiral coils. With the evenly distributed magnetic flux around the winding, the planar transformer with helical winding structure is excellent for high frequency switching mode power supplies in the 21st Century.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Microelectronic Engineering<br>Full Text
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Kavimandan, Mandar Dilip. "Integrated Inductors." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229637343.

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Panchal, Chirag. "Investigations of High Efficiency Wireless Power Transfer Systems (WPTS) for Electric Vehicles (EVs)." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/380677.

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Over the last decade, fossil fuel prices have significantly increased due to the dependency on hydrocarbon energy sources for transportation and electricity generation. In order to solve power generation issues, most governments in the world have heavily promoted the installation of roof top solar photovoltaic (PV) in domestic low voltage and commercial high voltage distribution networks. In addition, Electric Vehicles (EVs) have been introduced to substitute the hydrocarbon fuelled transportation which is required to provide high mileage and affordable prices. Currently, EVs have been charged with the utilisation of plug-in AC and DC chargers to charge their battery bank. To expand their range, EVs are required to have larger energy storage batteries, which leads to higher costs and limits their adoption in society. Furthermore, plug-in chargers require manual operation to connect to EVs, which may create health and safety issues such as electric shock and fire. Wireless Charging Systems (WCS) have the potential to minimise both these major concerns by offering frequent charge while the EV is in stationary or dynamic modes. Frequent charge to the EVs at the car park, traffic signal and on the roads brings indefinite charging options which can dramatically reduce the battery bank size. However, improvements in some of the challenging factors such as health and safety, power levels and power efficiency requires further investigation to create a user-friendliness of the WCS for EVs. This thesis deals with the investigation of concerning issues which are limiting the development of Wireless Electric Vehicle Charging Systems (WEVCS) from becoming a part of the electrified transportation system. Currently available wireless power transfer technology for the EVs has been studied including wireless transformer structures with a variety of ferrite shapes. WEVCS are associated with many health and safety issues, which have been discussed with the current developments in international standards. Two major applications; static and dynamic WEVCS, have been explained with up-to-date progress from research laboratories, universities and industries. A variety of laboratory prototypes have been developed with the help of calculation and simulation methods, and verified with experimental techniques. Firstly, High Frequency Wireless Planar Transformers (HFWPT) are used to investigate the flux leakages and other electromagnetic compatibility (EMC) problems which are associated with the wireless charging system’s efficiency. The HFWPT was designed using the bifilar winding concept on a PCB. An LLC resonant converter has been designed to improve the conversion efficiency with a maximized air gap. Assisted by a near-field scanner, the magnetic field has been analysed with and without a magnetic ferrite core at resonant frequency. The magnetic ferrite core in this arrangement is used to minimize flux leakages and to increase the magnetizing impedance. In addition, EMC computer modeling and simulation techniques are employed to investigate the magnetic flux distribution and associated EMC problems such as stray fluxes and hot spots. A finite element method (FEM) has been used to calculate the magnetic field. The effect of the planar magnetic ferrite cores on magnetic flux distribution has been investigated by using three designs. The first design has the ferrite core only at the primary side, the second draft has a planar core on the primary and secondary side, and the third design has a U-shape magnetic core for the primary and secondary side. A new proposed design is introduced to minimize flux leakages and reduce hot spots, in order to improve the flux distribution and to increase the magnetizing impedance. Poor considerations of leakage flux between the primary and secondary coils may cause complications for persons with a pacemaker or any other life supporting electronic devices. Two scenarios are investigated via computational simulation. Firstly, a simulation of a person with an electronic biomedical implant device standing beside a car during the charging process through the WCS is investigated. Secondly, a person is walking or standing over the primary coil area of the WCS when the system is not in charging mode. Both of these scenarios include an investigation of four different versions of magnetic core configurations, to examine the outer magnetic flux distribution as well as the power distribution of the WCS by using a FEM simulation. Another concerning issue is the lower power transfer efficiency of WCS for EVs in comparison to the plug-in due to the poor coupling between the transmitter and receiver charging pads. In order to solve the problem, in-wheel WCS for EVs have been introduced with a concept proven laboratory prototype, which can operate in static and dynamic applications. The coupling coefficient is dependent on the thickness of the tire rubber and the transmitter installation height underneath the road surface. A variety of scenarios have been applied to study the in-build steel belt (IBSB) tire effect on the wireless power transfer for the static and dynamic cases. FEM simulation has been performed to investigate the magnetic flux distribution and leakage fluxes due to IBSB in the vehicle’s tire. Finally, the Wireless Vehicle to Grid (W-V2G) concept has been presented to solve future instability issues on the distribution networks created by unscheduled feedback power from renewable energy sources (RES). In addition, W-V2G can provide a platform to transfer power wirelessly in both directions: grid to vehicle and vehicle to grid where the EV’s battery can be a back-up of additional energy storage to reduce the peak demand energy requirements. A 3.7 kW wireless transformer for a single phase W-V2G prototype, and a high efficiency compact filter inductor for a D-StatCom inverter in the three phase 30 kVA W-V2G have been built with the utilisation of calculation and simulation methods. Both prototypes have been constructed and validated with experimental methods. Currently, a 3.7 kW W-V2G prototype is under development, and will be finished in future with complete systems analysis and results.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Eng & Built Env<br>Science, Environment, Engineering and Technology<br>Full Text
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Ickitidze, L. P., and A. N. Mironyuk. "Planar Superconducting Magnetic Flux Transformer with Micro- and Nanosized Branches." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35455.

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The object of the study is a superconducting film magnetic flux transformer comprising two square shaped loops with the tapering active strips and a magnetosensitive film element between them. It is shown that splitting of the active strips into parallel micro- and nanosized superconducting branches and slits increases the gain factor of the transformer, i. е., the concentration of an external magnetic field on the magnetosensitive element, by a factor of more than six. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35455
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Bodegård, Andreas. "Design of a planar transformer for a series loaded resonant converter." Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414921.

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This report presents a project that has been made to present the design of a planar transformer as a part of a series loaded resonant DC/DC converter in a power unit. The design is based on an existing transformer that is not planar and so the characteristics of the transformer is translated into a planar version. A multilayer printed circuit board (PCB) design was made to fit a chosen magnetic ferrite core that was chosen based on the magnetic characteristics of the old core. Calculations were made for the loss of both core and windings and the final results show that it is possible to design a planar transformer from a traditional transformer.
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Kotte, Hari Babu. "High Frequency (MHz) Resonant Converters using GaN HEMTs and Novel Planar Transformer Technology." Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20894.

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The increased power consumption and power density demands of modern technologies have increased the technical requirements of DC/DC and AC/DC power supplies. In this regard, the primary objective of the power supply researcher/engineer is to build energy efficient, high power density converters by reducing the losses and increasing the switching frequency of converters respectively. Operating the converter circuits at higher switching frequencies reduces the size of the passive components such as transformers, inductors, and capacitors, which results in a compact size, weight, and increased power density of the converter. Therefore, the thesis work is focussed on the design, analysis and evaluation of isolated converters operating in the 1 - 5MHz frequency region with the assistance of the latest semi conductor devices, both coreless and core based planar power transformers designed in Mid Sweden University and which are suitable for consumer applications of varying power levels ranging from 1 – 60W. In high frequency converter circuits, since the MOSFET gate driver plays a prominent role, different commercially available MOSFET gate drivers were evaluated in the frequency range of 1 - 5MHz in terms of gate drive power consumption, rise/fall times and electromagnetic interference (EMI) and a suitable driver was proposed. Initially, the research was focused on the design and evaluation of a quasi resonant flyback converter using a multilayered coreless PCB step down transformer in the frequency range of 2.7 – 4MHz up to the power level of 10W. The energy efficiency of this converter is found to be 72 - 84% under zero voltage switching conditions (ZVS). In order to further improve the energy efficiency of the converter in the MHz frequency region, the new material device GaN HEMT was considered. The comparisons were made on a quasi resonant flyback DC-DC converter using both the Si and GaN technology and it was found that an energy efficiency improvement of 8 – 10% was obtained with the GaN device in the frequency range of 3.2 – 5MHz. In order to minimize the gate drive power consumption, switching losses and to increase the frequency of the converter in some applications such as laptop adapters, set top box (STB) etc., a cascode flyback converter using a low voltage GaN HEMT and a high voltage Si MOSFET was designed and evaluated using a multi-layered coreless PCB transformer in the MHz frequency region. Both the simulation and experimental results have shown that, with the assistance of the cascode flyback converter, the switching speeds of the converter can be increased with the benefit of obtaining a significant improvement in the energy efficiency as compared to that for the single switch flyback converter. In order to further maximize the utilization of the transformer, to reduce the voltage stress on MOSFETs and to obtain the maximum power density from the converter circuit, double ended topologies were considered. Due to the lack of high voltage high side gate drivers in the MHz frequency region, a gate drive circuitry utilizing the multi-layered coreless PCB signal transformer was designed and evaluated in both a half-bridge and series resonant converter (SRC). It was found that the gate drive power consumption using this transformer was around 0.66W for the frequency range of 1.5 - v 3.75 MHz. In addition, by using this gate drive circuitry, the maximum energy efficiency of the SRC using multilayered coreless PCB power transformer was found to be 86.5% with an output power of 36.5W in the switching frequency range of 2 – 3MHz. In order to further enhance the energy efficiency of the converter to more than 90%, investigations were carried out by using the multiresonant converter topology (LCC and LLC), novel hybrid core high frequency planar power transformer and the GaN HEMTs. The simulated and experimental results of the designed LCC resonant converter show that it is feasible to obtain higher energy efficiency isolated DC/DC converters in the MHz frequency region. The peak energy efficiency of the LCC converter at 3.5MHz is reported to be 92% using synchronous rectification. Different modulation techniques were implemented to regulate the converter for both line and load variations using a digital controller. In order to realize an AC/DC converter suitable for a laptop adapter application, consideration was given to the low line of the universal input voltage range due to the GaN switch limitation. The energy efficiency of the regulated converter operating in the frequency range of 2.8 – 3.5MHz is reported to be more than 90% with a load power of 45W and an output voltage of 22V dc. In order to determine an efficient power processing method on the secondary side of the converter, a comparison was made between diode rectification and synchronous rectification and optimal rectification was proposed for the converters operating in the MHz frequency range for a given power transfer application. In order to maintain high energy efficiency for a wide load range and to maintain the narrow switching frequency range for the given input voltage specifications, the LLC resonant converter has been designed and evaluated for the adapter application. From the observed results, the energy efficiency of the LLC resonant converter is maintained at a high level for a wide load range as compared to that for the LCC resonant converter. Investigations were also carried out on isolated class E resonant DC-DC converter with the assistance of GaN HEMT and a high performance planar power transformer at the switching frequency of 5MHz. The simulated energy efficiency of the converter for the output power level of 16W is obtained as 88.5% which makes it feasible to utilize the designed isolated converter for various applications that require light weight and low profile converters. In conclusion, the research in this dissertation has addressed various issues related to high frequency isolated converters and has proposed solution by designing highly energy efficient converters to meet the current industrial trends by using coreless and core based planar transformer technologies along with the assistance of GaN HEMTs. With the provided solution, in the near future, it is feasible to realize low profile, high power density DC/DC and AC/DC converters operating in MHz frequency region suitable for various applications.<br>High Frequency Switch Mode Power Supplies
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Books on the topic "Planar transformers"

1

Banerjee, Amal. Planar Spiral Inductors, Planar Antennas and Embedded Planar Transformers. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-08778-3.

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W, Bevan M., Harrison B. D, Leaver C. J, and Royal Society (Great Britain), eds. The production and uses of genetically transformed plants. London: Chapman & Hall on behalf of the Royal Society, 1994.

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Gruntovich, Nadezhda. Technical diagnostics of electrical equipment. ru: INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1891041.

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The textbook presents a modified theory of vibration diagnostics of rolling bearings. The methods of technical diagnostics of electrical equipment insulation without high-voltage tests are given. The physical nature of the electric arc inside the tank of an oil-filled transformer is revealed for the first time. The methods of complex technical diagnostics of electric motors and power oil-filled transformers are described. Expert systems of technical diagnostics of electrical equipment are considered. Conditions of damage to cables by partial discharges are revealed.&#x0D; Meets the requirements of the federal state standards of higher education of the latest generation.&#x0D; The textbook is intended for students, undergraduates and postgraduates of energy specialties of universities, as well as for specialists in technical diagnostics of equipment of thermal and nuclear power plants, industrial enterprises.
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Hobhouse, Henry. Seeds of change: Six plants that transformed mankind. London: Pan, 2002.

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Hobhouse, Henry. Seeds of change: Five plants that transformed mankind. New York: Perennial Library, 1987.

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Hobhouse, Henry. Seeds of change: Fire plants that transformed mankind. London: Sidgwick, 1985.

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1958-, Kramer Bill, Markel, A. J. (Anthony J.), National Renewable Energy Laboratory (U.S.), and International Electric Vehicle Symposium (25th : 2010 : Shenzhen, China), eds. Application of distribution transformer thermal life models to electrified vehicle charging loads using Monte-Carlo method: Preprint. Golden, CO]: National Renewable Energy Laboratory, 2011.

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W, Roberts E. Aging of safety class 1E transformers in safety systems of nuclear power plants. Washington, DC: Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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L, Edson Jerald, Udy A. C, Idaho National Engineering Laboratory, Lockheed Idaho Technologies Company, and U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering Technology., eds. Aging of safety class 1E transformers in safety systems of nuclear power plants. Washington, DC: Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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J, Reinert, and Binding H. 1939-, eds. Differentiation of protoplasts and of transformed plant cells. Berlin: Springer-Verlag, 1986.

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Book chapters on the topic "Planar transformers"

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Banerjee, Amal. "Fundamental Physics of Planar Inductors, Embedded Planar Transformers, and Planar (Patch) Antennas." In Planar Spiral Inductors, Planar Antennas and Embedded Planar Transformers, 9–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08778-3_2.

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Banerjee, Amal. "SPICE Based Design and Analysis of Planar Spiral Inductors and Embedded|Integrated Planar Spiral Inductor Transformers and Planar Antennas." In Planar Spiral Inductors, Planar Antennas and Embedded Planar Transformers, 89–185. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08778-3_3.

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Banerjee, Amal. "Introduction and Problem Statement." In Planar Spiral Inductors, Planar Antennas and Embedded Planar Transformers, 1–8. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08778-3_1.

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Xu, Dianguo, Yueshi Guan, Yijie Wang, and Xiangjun Zhang. "Air-Core Planar Inductors and Transformers on PCB." In CPSS Power Electronics Series, 91–109. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7424-5_7.

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Liu, Zhaowei, Qunhai Huo, Jiwen Han, Lixin Wu, Jingyuan Yin, and Tongzhen Wei. "Isolated Weinberg Magnetic Integrated Planar Transformer." In Conference Proceedings of the 2023 3rd International Joint Conference on Energy, Electrical and Power Engineering, 83–90. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-3940-0_8.

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Xu, Jin. "Construction of Maximal Planar Graphs with the Same Order." In Maximal Planar Graph Theory and the Four-Color Conjecture, 117–29. Singapore: Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-4745-3_4.

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Abstract From this chapter, we will present a series of methods to construct maximal planar graphs. In this chapter, we first introduce a simple but useful operation, called diagonal flip (or edge-flipping), by a finite sequence of which any two maximal planar graphs with the same order can be transformed into each other.
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Tepfer, D. "Agrobacterium rhizogenes-Mediated Transformation: Transformed Roots to Transformed Plants." In Gene Transfer to Plants, 45–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79247-2_6.

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Zainal Abidin, M. Firdaus, Mohd Nadzri Mamat, and Mohd Fadzil Bin Ain. "Modelling of High Frequency Coreless Planar Transformer with TWR Hexagonal Winding." In Lecture Notes in Electrical Engineering, 66–71. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8129-5_11.

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Topping, J. F., and K. Lindsey. "Molecular Characterization of Transformed Plants." In Plant Molecular Biology — A Laboratory Manual, 427–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-87873-2_9.

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Makki, Loreine, Antoine Laspeyres, Anne-Sophie Descamps, Julien Weckbrodt, Marc Anthony Mannah, Christophe Batard, and Nicolas Ginot. "Dielectric Material Significance on Common Mode Transient Immunity of a Shielded Pulse Planar Transformer." In Lecture Notes in Electrical Engineering, 167–77. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24837-5_13.

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Conference papers on the topic "Planar transformers"

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Li, Ming-Jun, Qiang-Ming Cai, Tao Zhou, Yu Tang, Xin Cao, Longjian Zhou, Haoran Li, et al. "Modeling of Planar Transformers Based on PEEC Method." In 2024 Photonics & Electromagnetics Research Symposium (PIERS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/piers62282.2024.10618662.

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Min, Htat W., and Mike K. Ranjram. "Improved High-Frequency, Medium-Voltage Isolation Planar Transformers." In 2024 IEEE Energy Conversion Congress and Exposition (ECCE), 1533–40. IEEE, 2024. https://doi.org/10.1109/ecce55643.2024.10861122.

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Sadasivan, Arya, Fariba Fateh, and Behrooz Mirafzal. "Design of Planar Transformers for Multiport Converters: A Study." In 2024 IEEE Kansas Power and Energy Conference (KPEC), 1–6. IEEE, 2024. http://dx.doi.org/10.1109/kpec61529.2024.10676282.

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Chai, Junfan, Kaiyuan Liu, Shunshun Ma, Zhan Shen, Long Jin, and Wu Chen. "Prediction of Parameter Drifts in Planar Transformers Based on Deep Learning." In 2024 CPSS & IEEE International Symposium on Energy Storage and Conversion (ISESC), 702–7. IEEE, 2024. https://doi.org/10.1109/isesc63657.2024.10785305.

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Yuan, Tianlong, Feng Jin, Gibum Yu, and Qiang Li. "Analysis and Comparison of Integrated Planar Transformers for CLLC Resonant Converters." In 2024 IEEE Energy Conversion Congress and Exposition (ECCE), 6890–96. IEEE, 2024. https://doi.org/10.1109/ecce55643.2024.10860916.

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Banerjee, Gourab, Abhishek Kar, Dona Chakraborty, Sayantan Chanda, and Mainak Sengupta. "Comparative Studies of Wire-Wound and Planar Transformers in a PSFB Converter for Welding." In 2024 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 1–6. IEEE, 2024. https://doi.org/10.1109/pedes61459.2024.10961305.

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Muneeb, Abdul, Abdul Basit Mirza, Mustafeez Ul Hassan, Ali Anwar, Andrew Castiblanco, and Fang Luo. "Parasitic Capacitances in High Step Ratio Planar Transformers for Dual Active Bridge Converters: Cause and Effect." In IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society, 1–6. IEEE, 2024. https://doi.org/10.1109/iecon55916.2024.10905246.

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Jin, Shutong, Ruiyu Wang, Muhammad Zahid, and Florian T. Pokorny. "How Physics and Background Attributes Impact Video Transformers in Robotic Manipulation: A Case Study on Planar Pushing." In 2024 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 7391–98. IEEE, 2024. https://doi.org/10.1109/iros58592.2024.10802583.

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Corgne, Gautier, Reda Bakri, Xavier Margueron, and Frederic Gillon. "Tuning of Planar Transformer Leakage Inductance." In 2024 IEEE Design Methodologies Conference (DMC), 1–6. IEEE, 2024. https://doi.org/10.1109/dmc62632.2024.10812150.

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Koizumi, M. T., R. R. Teixeira, J. B. Chiocca, I. Rede, and F. C. Castaldo. "Electroplated planar transformers." In 2011 Brazilian Power Electronics Conference (COBEP 2011). IEEE, 2011. http://dx.doi.org/10.1109/cobep.2011.6085246.

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Reports on the topic "Planar transformers"

1

Schofield, Daryl, Joshua M. Schare, Sarah Jill Glass, Alexander William Roesler, Kevin Gregory Ewsuk, George Slama, and Dave Abel. Planar LTCC transformers for high voltage flyback converters. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/945896.

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Schofield, Daryl, Joshua M. ,. Ph D. Schare, George Slama, and David Abel. Planar LTCC transformers for high voltage flyback converters: Part II. Office of Scientific and Technical Information (OSTI), February 2009. http://dx.doi.org/10.2172/947262.

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Hagwood, Charles, K. L. Stricklett, and Oskars Petersons. Operating characteristics of the proposed sampling plans for testing distribution transformers. Gaithersburg, MD: National Bureau of Standards, 2004. http://dx.doi.org/10.6028/nist.tn.1456.

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Toman, G., and R. Gazdzinski. Aging Management Guideline for commercial nuclear power plants: Power and distribution transformers. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/10154007.

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Ranjram, Mike. Planar Transformer Systems for Modular Power Electronics in Long-Haul, Low-Cost PV Systems. Office of Scientific and Technical Information (OSTI), July 2024. http://dx.doi.org/10.2172/2452814.

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Roberts, E. W., J. L. Edson, and A. C. Udy. Aging of safety class 1E transformers in safety systems of nuclear power plants. Office of Scientific and Technical Information (OSTI), February 1996. http://dx.doi.org/10.2172/201806.

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Clendenin, James E. A Polarized Electron RF Photoinjector Using the Plane-Wave-Transformer (PWT) Design. Office of Scientific and Technical Information (OSTI), August 2001. http://dx.doi.org/10.2172/799030.

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Ramírez Gómez, Margarita, Diana Paola Serralde Ordóñez, and Ruth Rebeca Bonilla. Biofertilización del cultivo de la uchuva. Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, 2012. http://dx.doi.org/10.21930/agrosavia.plegable.2012.5.

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La fertilización biológica consiste en la aplicación de productos que tienen microorganismos capaces de transformar importantes elementos nutricionales de estados no disponibles a formas disponibles para las plantas a través de procesos biológicos.
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Jander, Georg, Gad Galili, and Yair Shachar-Hill. Genetic, Genomic and Biochemical Analysis of Arabidopsis Threonine Aldolase and Associated Molecular and Metabolic Networks. United States Department of Agriculture, January 2010. http://dx.doi.org/10.32747/2010.7696546.bard.

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Since the amino acids threonine and isoleucine can be limiting in mammalian diet and there is interest in increasing their abundance in certain crop plants. To meet this need, a BARD proposal was written with two main research objectives: (i) investigate new avenues for manipulating threonine and isoleucine content in plants and (ii) study the role of threonine aldolase in plant metabolism. Research conducted to meet these goals included analysis of the sub-cellular localization of threonine aldolase in the plant, analysis of metabolic flux in developing embryos, over- and under-expression of Arabidopsis threonine aldolases, and transcriptional and metabolic analysis of perturbations resulting from altered threonine aldolase expression. Additionally, the broader metabolic effects of increasing lysine biosynthesis were investigated. An interesting observation that came up in the course of the project is that threonine aldolase activity affects methionine gamma-lyase in Arabidopsis. Further research showed that threonine deaminase and methionine gamma-lyase both contribute to isoleucine biosynthesis in plants. Therefore, isoleucine content can be altered by manipulating the expression of either or both of these enzymes. Additionally, both enzymes contribute to the up to 100-fold increase in isoleucine that is observed in drought-stressed Arabidopsis. Toward the end of the project it was discovered that through different projects, both groups had been able to independently up-regulate phenylalanine accumulation by different mechanisms. The Galili lab transformed Arabidopsis with a feedbackinsensitive bacterial enzyme and the Jander lab found a feedback insensitive mutation in Arabidopsis arogenate dehydratase. Exchange of the respective plant lines has allowed a comparative analysis of the different methods for increasing phenylalanine content and the creation of double mutants. The research that was conducted as part of this BARD project has led to new insights into plant amino acid metabolism. Additionally, new approaches that were found to increase the accumulation of threonine, isoleucine, and phenylalanine in plants have potential practical applications. Increased threonine and isoleucine levels can increase the nutritional value of crop plants. Elevated isoleucine accumulation may increase the osmotic stress tolerance of plants. Up-regulation of phenylalanine biosynthesis can be used to increase the production of downstream higher-value plant metabolites of biofuel feed stocks.
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Tucker, Mark L., Shimon Meir, Amnon Lers, Sonia Philosoph-Hadas, and Cai-Zhong Jiang. Elucidation of signaling pathways that regulate ethylene-induced leaf and flower abscission of agriculturally important plants. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7597929.bard.

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The Problem: Abscission is a highly regulated process, occurring as a natural terminal stage of development, in which various organs are separated from the parent plant. In most plant species, the process is initiated by a decrease in active auxin in the abscission zone (AZ) and an increase in ethylene, and may be accelerated by postharvest or environmental stresses. Another potential key regulator in abscission is IDA (Inflorescence Deficient in Abscission), which was identified as an essential peptide signal for floral organ abscission in Arabidopsis. However, information is still lacking regarding the molecular mechanisms integrating all these regulators. In our previous BARD funded research we made substantial progress towards understanding these molecular events in tomato, and the study is still in progress. We established a powerful platform for analysis of genes for regulatory proteins expressed in AZ. We identified changes in gene expression for several transcription factors (TFs) directly linked to ethylene and auxin signaling and several additional regulatory proteins not so obviously linked to these hormones. Moreover, we demonstrated using a virus-induced gene silencing (VIGS) assay that several play a functional role in the onset of abscission. Based on these results we have selected 14 genes for further analysis in stably transformed tomato plants. All 14 genes were suppressed by RNA interference (RNAi) using a constitutive promoter, and 5 of them were also suppressed using an abscission-specific promoter. Transformations are currently at different stages of progress including some lines that already display an abscission phenotype. Objectives: We propose here to (1) complete the functional analysis of the stably transformed tomato plants with T2 lines and perform transcriptome analysis using custom abscission-specific microarrays; (2) conduct an indepth analysis of the role of IDA signaling in tomato leaf and flower abscission; (3) perform transcriptome and proteome analyses to extend the earlier gene expression studies to identify transcripts and proteins that are highly specific to the separation layer (i.e., target cells for cell separation) prior to the onset of abscission; (4) extend and compliment the work in tomato using a winnowed set of genes in soybean. Methodology: Next Generation Sequencing (NGS) of mRNA will be used to further increase the list of abscission-associated genes, and for preparation of a custom tomato abscission microarray to test altered gene expression in transgenic plants. Tandem mass spectrometry (LC-MS/MS) of protein extracts from leaf petiole, flower pedicel and their AZ tissues will be used to identify the proteome of the AZ before and during abscission. AZ-specific gene promoters will be used in stably transformed tomato plants to reduce non-target phenotypes. The bean pod mottle virus (BPMV) plasmid vectors will be used for VIGS analysis in soybean. Expected Contribution: Our study will provide new insights into the regulation of ethylene-induced abscission by further revealing the role of key regulators in the process. This will permit development of novel techniques for manipulating leaf and flower abscission, thereby improving the postharvest performance of agriculturally important crops.
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