{"title":"A high power density magnetically integrated scheme of LLC converter","authors":"Lei Li, Feng Hong, Minggang Chen, Qinsong Qian","doi":"10.1049/pel2.70006","DOIUrl":null,"url":null,"abstract":"<p>To improve efficiency and power density within LLC converters, this paper presents a magnetically integrated scheme through the magnetoresistive model, which includes a resonant inductor and a transformer on one magnetic core. A magnetoresistive model is proposed to analyse the magnetic flux and is verified by simulation. Further, this paper investigates the fringing field near the core's air gap to prevent the occurrence of overheating and chaotic winding current distribution, optimizing the shapes of the transformer's secondary winding and core. A half-brick (2.28″ × 2.4″ × 0.5″) LLC converter with a peak efficiency of 94.8% is then constructed using these integrated magnetic components, achieving a power density of 452 W/in.<sup>3</sup>, and maintaining a lower operating temperature of the core.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70006","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/pel2.70006","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
To improve efficiency and power density within LLC converters, this paper presents a magnetically integrated scheme through the magnetoresistive model, which includes a resonant inductor and a transformer on one magnetic core. A magnetoresistive model is proposed to analyse the magnetic flux and is verified by simulation. Further, this paper investigates the fringing field near the core's air gap to prevent the occurrence of overheating and chaotic winding current distribution, optimizing the shapes of the transformer's secondary winding and core. A half-brick (2.28″ × 2.4″ × 0.5″) LLC converter with a peak efficiency of 94.8% is then constructed using these integrated magnetic components, achieving a power density of 452 W/in.3, and maintaining a lower operating temperature of the core.
期刊介绍：
IET Power Electronics aims to attract original research papers, short communications, review articles and power electronics related educational studies. The scope covers applications and technologies in the field of power electronics with special focus on cost-effective, efficient, power dense, environmental friendly and robust solutions, which includes:
Applications:
Electric drives/generators, renewable energy, industrial and consumable applications (including lighting, welding, heating, sub-sea applications, drilling and others), medical and military apparatus, utility applications, transport and space application, energy harvesting, telecommunications, energy storage management systems, home appliances.
Technologies:
Circuits: all type of converter topologies for low and high power applications including but not limited to: inverter, rectifier, dc/dc converter, power supplies, UPS, ac/ac converter, resonant converter, high frequency converter, hybrid converter, multilevel converter, power factor correction circuits and other advanced topologies.
Components and Materials: switching devices and their control, inductors, sensors, transformers, capacitors, resistors, thermal management, filters, fuses and protection elements and other novel low-cost efficient components/materials.
Control: techniques for controlling, analysing, modelling and/or simulation of power electronics circuits and complete power electronics systems.
Design/Manufacturing/Testing: new multi-domain modelling, assembling and packaging technologies, advanced testing techniques.
Environmental Impact: Electromagnetic Interference (EMI) reduction techniques, Electromagnetic Compatibility (EMC), limiting acoustic noise and vibration, recycling techniques, use of non-rare material.
Education: teaching methods, programme and course design, use of technology in power electronics teaching, virtual laboratory and e-learning and fields within the scope of interest.
Special Issues. Current Call for papers:
Harmonic Mitigation Techniques and Grid Robustness in Power Electronic-Based Power Systems - https://digital-library.theiet.org/files/IET_PEL_CFP_HMTGRPEPS.pdf
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