İres İSKENDER, Zafer DOĞAN, Mustafa ÖZSOY

Manyetik Rezonansa Dayalı Kablosuz Güç Transferi İçin Yeni Bir Nüve Geometrisi

Kablosuz Güç Transferi (KGT) uygulamalarında en önemli hedef, verimli bir enerji transferi sağlamaktır. KGT günümüzde cep telefonu şarjı, elektrikli araç şarjı, aydınlatma, kontrol vb. birçok alanda uygulanmaktadır. Yüksek verimi, çevresel olumsuz etkilerinin az olması gibi avantajlarından dolayı, manyetik rezonans yöntemi kısa hava aralıklı mesafelerde KGT için en çok tercih edilen yöntemdir. Manyetik rezonansa dayalı KGT sistemlerinde, sistem verimini artırmak için yüksek verimli bir KGT transformatörü kullanılmalıdır. Bu çalışmada manyetik rezonansa dayalı bir KGT sisteminin tasarımı yapılmıştır. Bu amaçla öncelikle hibrit (hava-ferrit) nüveli özgün bir transformatör tasarlanmıştır. Transformatörün Dairesel-Dilimli Parçalı(D-DP) ferrit nüve yapısı ilk defa bu çalışmada kullanılmıştır. Transformatörün sargıları litz iletken olarak tasarlanmıştır. Transformatörde kaçak akıları en aza indirmek amacıyla sargıların dış yüzeylerine alüminyum levhalar kullanılarak manyetik akı sargılar arasında kalmaya zorlanmıştır. Tasarlanan transformatörün sonlu elemanlar yöntemi ile manyetik analizleri yapılmış ve sonuçları nümerik hesaplarla doğrulanmıştır. Manyetik analiz sonuçları kullanılarak, KGT transformatörü benzetim devresi üzerinden yüklenmiş ve 5 cm’lik bir hava aralığında % 97 verim ile güç transferi gerçekleştirilmiştir. Elde edilen sonuçlar D-DP ferrit nüve yapısının KGT transformatörü uygulamalarında başarı ile kullanılabileceğini göstermiştir.

A New Core Geometry for Wireless Power Transfer Based on Magnetic Resonance

The most important goal in Wireless Power Transfer (WPT) applications is to provide efficient energy transfer. WPT is applicable at mobile phone charging, electric vehicle charging, lighting, control etc. Due to its high efficiency and low environmental impact, magnetic resonance is the most preferred method for short-range distances. In WPT systems based on magnetic resonance, a high efficiency WPT transformer should be used to increase system efficiency. In this study, a WPT system based on magnetic resonance is designed. For this purpose, firstly, a transformer with air-ferrite hybrid core is designed. The transformer's circular-sliced segmented (C-SS) ferrite core structure was used for the first time in this study. The transformer windings are designed as litz conductors. In order to minimize leakage fluxes in the transformer, the magnetic field was forced to stay between the windings by using aluminum plates on the outer surfaces of the windings. Magnetic analysis of the designed transformer was made with finite element method and the results were confirmed by numerical calculations. Using the magnetic analysis results, the WPT transformer was loaded over the simulation circuit and power transfer was achieved in a 5 cm air gap with 97% efficiency. The results showed that C-SS ferrite core structure can be used successfully in WPT transformer applications.

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