내부 손실이 고려된 LLC 공진형 하프브릿지 컨버터의정상상태 특성에 관한 연구
A Study on Steady State Characteristics of LLC Resonant Half Bridge Converter Considering Internal Losses
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초록
본 논문에서는 LLC 공진형 하프브릿지 컨버터의 내부손실이 반영된 등가회로를 제안하고, 손실 요소가 포함된 정상상태특성식을 유도하였다. 그 결과를 이용하여 입출력 전압이득과 입력 임피던스의 주파수 특성을 무손실 모델과 비교하였다. 제안한 모델과 유도식을 검증하기 위해서 최대 전력이 1kW급인 LLC 공진형 하프브릿지 컨버터의 전원장치의 주요 소자를 동일한 조건에서 선정하여 전압이득과 입력 임피던스와 같은 정상상태 특성을 비교하였다. 특히 두 가지 모델에 대한 정상상태오차를 보다 면밀하게 비교하기 위해서 실제 회로 설계 단계에서 가장 중요하게 고려되는 부하 전류에 대한 스위칭 주파수의 변화를 관찰 하였다. 그 결과 본 논문에서 제안한 모델과 해석 결과로부터 동작 주파수의 오차가 상당 부분 개선되었다는것을 확인 하였다.
Abstract
In this paper, an equivalent circuit reflecting the internal loss of the LLC resonant half bridge converter was proposedand a steady state characteristic equation including the loss factors was derived. Using the results, the frequencycharacteristics of I/O voltage gain and input impedance were compared with the lossless model In order to verify theproposed model and the derived equation, the main components of the 1kW class LLC resonant half bridge converterwere selected under the same conditions and the steady state characteristics such as voltage gain and input impedancewere compared. In particular, to compare more closely the steady state error of the two models, we observed the changein switching frequency with respect to the load current, which is considered to be the most important in the actual circuitdesign stage. As a result, it is confirmed that the error of the operating frequency is significantly improved from theproposed model and the analysis result.
참고문헌 (9)
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