A contact-less system using a series resonant converter and a rectangular type core

作者：Kim Yoon Ho^*; Jin Kang Hwan

来源：International Journal of Electronics, 2010, 97(8): 945-956.

DOI：10.1080/00207211003733296

• contact-less transformer
• EE core
• rectangular core
• series resonant converter

Since the contact-less power transmission system accomplishes power transfer using magnetic coupling of the transformer without a mechanical contact, it has the advantages of electric isolation, safety, reliability, low maintenance and a long-product life. However, a contact-less transformer with a large air gap has a low coupling coefficient and high leakage inductance. This, in turn, results in poor power conversion efficiency. In this article, a contact-less power transmission system based on a rectangular type core and a series resonant converter is proposed to improve system efficiency and performance. The proposed system is designed with an air gap of 1mm and 50kHz switching frequency, but it is assumed that in a practical application, the air gap varies. It is verified by experimental results that the proposed contact-less power transmission system based on the rectangular type core and a series resonant converter can substantially reduce the circulating current and improve the system efficiency. Also, it is verified that even with an increased air gap, the proposed system maintains soft switching and avoids switching devices' current spikes while suppressing the increase of the circulating current caused by an air gap increase.

• 出版日期2010