Engineering PhD thesis Considering load impedance fluctuations of resonant power conversion system 4-terminal network desig by Jeong Eui-Hoon Seoul National University Graduate School Department of Electrical and Information Engineering

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Engineering PhD thesis Considering load impedance fluctuations of resonant power conversion system 4-terminal network design 

 Seoul National University Graduate 

School Department of Electrical and Information Engineering

By  Jeong Eui-Hoon

ABSTRACT

Resonant power conversion systems have been widely used for high-frequency power conversion due to the advantage of low switching losses in inverter circuits. Such a system structure has been adopted in various fields such as battery charging, wireless power transmission, plasma driving system, and etc. Resonant power conversion systems operate very efficiently under one driving operation condition, but performance is easily degraded by system variations. In this dissertation, a systematic method for designing a resonant network, which is a key element of a resonant power conversion system, is proposed. The degree of design freedom of a two-port network is analyzed based on the general and mathematical model. This dissertation presents methods utilize the design freedoms to shape the input impedance trajectories to the desired way or to compress the input impedance variations to a certain value when the load impedance varies in a certain range. Based on this theoretical background, a resonant power conversion system with robust characteristics against load impedance is constructed. The proposed method is applied to design the wireless power transfer system that has a robust output characteristic against coil coupling variation. In addition, the proposed method is used to construct a high-frequency power conversion system that maintains impedance matching even with a wide range of load impedance variations. For the design examples, simulation and experimental results are presented to verify the effectiveness and the superiority of the proposed method. 

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