공학박사학위논문
부하 임피던스 변동을 고려한
공진형 전력 변환 시스템의
4 단자 네트워크 설계
서울대학교 대학원
전기∙정보공학부
정 의 훈
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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