scholarly journals A Coupled-Inductor Interleaved LLC Resonant Converter for Wide Operation Range

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 315
Author(s):  
Qianfan Zhou ◽  
Yang Liu ◽  
Zongjian Li ◽  
Zhixing He
Keyword(s):  
High Gain ◽  
High Energy ◽  
Transmission Efficiency ◽  
Resonant Converter ◽  
Zero Voltage Switching ◽  
Interleaved Structure ◽  
Llc Resonant Converter ◽  
Simulation And Experiment ◽  
Modulation Methods

In this paper, a coupled-inductor interleaved LLC resonant converter (CI-ILLC) was proposed, which can achieve extensive operation range applications by multiplexing inductors and switches. In this proposed CI-ILLC, the coupled-inductor not only serves as a filter inductor but also plays the role of transformer to improve the power density. By changing the modulation methods, the proposed converter can work at three modes for a wide operation range, namely high gain (HG) mode, medium gain (MG) mode, and low gain (LG) mode. Moreover, the interleaved structure greatly reduces the current ripple and current stress of switches. Besides, in HG and MG modes, all switches can realize zero-voltage switching, with high energy transmission efficiency. Finally, the simulation and experiment results of the prototype with 120–200 V input and 50–200 V output are presented to verify the viability of the proposed converter.

Design and Implementation of LLC Resonant Converter for Photovoltaic Battery Charging Application

2015 ◽  
Vol 785 ◽  
pp. 101-105
Author(s):  
Adrian Soon Theam Tan ◽  
Shahid Iqbal
Keyword(s):  
High Efficiency ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Photovoltaic System ◽  
Resonant Converter ◽  
Battery Charging ◽  
Zero Voltage Switching ◽  
Design And Implementation ◽  
Switching Losses ◽  
Llc Resonant Converter

Photovoltaic power conditioning system (PVPCS) requires a high efficiency dc-dc converterstage capable of wide input voltage regulation and have the ease of maximum power point implementation for both stand alone photovoltaic system and grid-connected system. Galvanic isolation at the dc-dc stage can replace the isolation needed in the inverter stage and thus reduce the sizeof isolation transformer and increases overall system efficiency. This paper presents detailed analysis,design and implementation of a LLC resonant converter for photovoltaic battery charging application.The LLC resonant converter operate with zero voltage switching (ZVS) turn on and low current turnoff thus reducing switching losses. The experimental results are given to validate the operation andperformance of the converter.

Study of Dual-Active Series Resonant DC-DC Converter for High Power Applications

2013 ◽  
Vol 748 ◽  
pp. 502-505
Author(s):  
Yan Zhi Zhang ◽  
Ping Wang
Keyword(s):  
High Power ◽  
Dynamic Performance ◽  
Transmission Efficiency ◽  
Exact Expression ◽  
Zero Voltage Switching ◽  
Switching Power ◽  
Zero Current Switching ◽  
Zero Current ◽  
Series Resonant ◽  
Simulation And Experiment

This paper investigates a high power dual-active isolated DC-DC converter employing LC series resonant technology. The switches of the circuit may work in either zero-voltage-switching (ZVS) or zero-current-switching (ZCS) which greatly reduces the switching power losses and raises the transmission efficiency. The dynamic performance of the circuit and the formula of the output power which no paper has given the exact expression can get by building the DC model of the converter. Finally, simulation and experiment have been conducted to verify the correctness of the analysis.

scholarly journals Voltage Balance Switching Scheme for Series-Connected SiC MOSFET LLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4003 ◽  
Author(s):  
Cha ◽  
Kim
Keyword(s):  
High Efficiency ◽  
Field Effect Transistors ◽  
Input Voltage ◽  
Oxide Semiconductor ◽  
System Stability ◽  
Resonant Converter ◽  
Switching Scheme ◽  
Zero Voltage Switching ◽  
Voltage Balance ◽  
Llc Resonant Converter

To achieve high efficiency and power density, silicon carbide (SiC)-based Inductor-Inductor-Capacitor (LLC) resonant converters are applied to the DC/DC converter stage of a solid-state transformer (SST). However, because the input voltage of an SST is higher than the rated voltage of a commercial SiC device, it is essential to connect SiC devices in series. This structure is advantageous in terms of voltage rating, but a parasitic capacitance tolerance between series-connected SiC devices causes voltage imbalance. Such imbalance greatly reduces system stability as it causes overvoltage breakdown of SiC device. Therefore, this paper proposes a switching scheme to solve the voltage imbalance between SiC metal-oxide-semiconductor field-effect transistors (MOSFETs). The proposed scheme sequentially turns off series-connected SiC MOSFETs to compensate for the turn-off delays caused by parasitic capacitor tolerances. In addition, dead-time selection methods to achieve voltage balance and zero voltage switching simultaneously are provided in detail. To verify the effectiveness of the proposed scheme, experiments were conducted on a 2 kW series-connected SiC MOSFET LLC resonant converter prototype.

scholarly journals High-Efficiency Bidirectional LLC Resonant Converter with Primary Auxiliary Windings

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4692 ◽  
Author(s):  
Eun-Soo Kim ◽  
Jae-Sung Oh
Keyword(s):  
Power Flow ◽  
Mutual Coupling ◽  
High Efficiency ◽  
High Gain ◽  
Resonant Converters ◽  
Resonant Converter ◽  
Llc Resonant Converter

In this paper, high-efficiency bidirectional LLC resonant converters with primary auxiliary windings in transformers of resonant circuits are proposed. Even though resonant capacitors are used on the primary and secondary sides, the proposed converter can operate, regardless of the direction of the power flow, with the high gain characteristics of the LLC resonant converter without the mutual coupling of resonant capacitors. The operation principles and gain characteristics of the proposed bidirectional DC–DC converters are described in detail. A 3.3 kW prototyped bidirectional LLC resonant converter for interfacing 750 VDC buses was built and tested to verify the effectiveness and applicability of this proposed converter.

Fundamentality

2017 ◽  
Author(s):  
Richard Healey
Keyword(s):  
Quantum Theory ◽  
High Energy Physics ◽  
Physical Property ◽  
Natural World ◽  
High Energy ◽  
Quantum Field Theories ◽  
Fundamental Physics ◽  
The World ◽  
Energy Physics

The metaphor that fundamental physics is concerned to say what the natural world is like at the deepest level may be cashed out in terms of entities, properties, or laws. The role of quantum field theories in the Standard Model of high-energy physics suggests that fundamental entities, properties, and laws are to be sought in these theories. But the contextual ontology proposed in Chapter 12 would support no unified compositional structure for the world; a quantum state assignment specifies no physical property distribution sufficient even to determine all physical facts; and quantum theory posits no fundamental laws of time evolution, whether deterministic or stochastic. Quantum theory has made a revolutionary contribution to fundamental physics because its principles have permitted tremendous unification of science through the successful application of models constructed in conformity to them: but these models do not say what the world is like at the deepest level.

scholarly journals Pannexins and Connexins: Their Relevance for Oocyte Developmental Competence

2021 ◽  
Vol 22 (11) ◽  
pp. 5918
Author(s):  
Paweł Kordowitzki ◽  
Gabriela Sokołowska ◽  
Marta Wasielak-Politowska ◽  
Agnieszka Skowronska ◽  
Mariusz T. Skowronski
Keyword(s):  
Assisted Reproductive Technologies ◽  
Mammalian Species ◽  
Atp Release ◽  
Reproductive Technologies ◽  
High Energy ◽  
Developmental Competence ◽  
Physiological Processes ◽  
Protein Group ◽  
Multicellular Organisms

The oocyte is the major determinant of embryo developmental competence in all mammalian species. Although fundamental advances have been generated in the field of reproductive medicine and assisted reproductive technologies in the past three decades, researchers and clinicians are still trying to elucidate molecular factors and pathways, which could be pivotal for the oocyte’s developmental competence. The cell-to-cell and cell-to-matrix communications are crucial not only for oocytes but also for multicellular organisms in general. This latter mentioned communication is among others possibly due to the Connexin and Pannexin families of large-pore forming channels. Pannexins belong to a protein group of ATP-release channels, therefore of high importance for the oocyte due to its requirements of high energy supply. An increasing body of studies on Pannexins provided evidence that these channels not only play a role during physiological processes of an oocyte but also during pathological circumstances which could lead to the development of diseases or infertility. Connexins are proteins that form membrane channels and gap-junctions, and more precisely, these proteins enable the exchange of some ions and molecules, and therefore they do play a fundamental role in the communication between the oocyte and accompanying cells. Herein, the role of Pannexins and Connexins for the processes of oogenesis, folliculogenesis, oocyte maturation and fertilization will be discussed and, at the end of this review, Pannexin and Connexin related pathologies and their impact on the developmental competence of oocytes will be provided.

Sign in / Sign up

Export Citation Format

Share Document