LLC DC to DC 공진 컨버터의 고주파 변압기최적화 설계에 관한 연구
A study on an optimal design of the high frequency transformer in LLC DC to DC resonant converter
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초록
본 논문에서는 315W급 65인치 UHD-TV용 LLC DC to DC 공진 컨버터에 사용되고 있는 Slim형 고주파 변압기의 최적화 설계에 대해서 나타낸다. 또한 본 논문에서는 LLC 공진 변압기의 코어 손실 분석, AC 권선 손실 분석 및 권선 배치 최적화 설계를 통해Slim형 고주파 변압기의 최적화 설계를 수행한다. 특히 본 논문에서는 이론적으로 해석하여 얻어진 결과를 토대로 고효율 및 Slim형 고주파 변압기는 교류 권선 손실 최소화 및 권선 자동화를 위하여 인터리브 및 수직형 권선 구조로 구성한다. 본 논문 제안한수직형 권선 구조 방식의 Slim형 고주파 변압기의 1차측 권선은 Litz 권선을 2차 권선은 PCB와 동판 권선을 사용하였다. 최종적으로 Maxwell 2D 및 3D Tool을 이용한 시뮬레이션 결과를 토대로 이론 해석의 정당성을 입증하기 위해서 실험 결과를 통해 본 논문에서 제안한 Slim형 고주파 변압기의 최적화 설계를 수행하였다.
Abstract
This paper presents an optimal design of the slim type high frequency transformer used in the LLC DC to DCresonant converter for 65-inch UHD-TV with the rated power of 315W. This paper also performs an optimaldesign of the slim type high frequency through core loss analysis, AC winding loss analysis, and optimizationdesign of the winding arrangement of the LLC resonant transformer. Particularly, the high-efficiency and slim typehigh frequency transformer based on the obtained results from theoretical analysis in this paper is constructed inthe interleaved and vertical winding structures of its transformer to realize the winding method of automatic typeand minimize AC winding loss. The primary and secondary windings of the slim type high frequency transformerthe vertical winding structure proposed in this paper used the Litz-wire windings, PCB and copper plate windings,respectively. Finally, an optimal design of the slim type high frequency transformer proposed in this paper wascarried out through the experimental results to confirm the validity of theoretical analysis based on the simulationresults using Maxwell 2D and 3D tool.
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