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변압기 영향을 포함한 고정주파수 LCL형 DC-DC 컨버터 해석
박상은(Sangeun Park),차한주(Hanju Cha) 대한전기학회 2016 전기학회논문지 Vol.65 No.1
An LCL-type Isolated dc-dc converter operating for constant output voltage is analyzed, including the effect of a high frequency transformer using ac complex circuit approximation. Its solution is derived and is used to obtain the characteristics of the proposed converter. The analyses show through converter modeling, phasor diagram and gain comparison that inclusion of a high frequency transformer results in introduction of magnetizing inductance and leakage inductances at conventional LCL dc-dc converter with ideal transformer. The theoretical and simulation results are presented in case of the wide variations in input voltage and load current in detail. Analysis and simulation results observed that introduction of a transformer in the dc-dc converter had considerable effect on the performance, especially in the case of low output voltage and large load.
연속전류모드에서 기생손실들을 고려한 고정주파수 LCL형 컨버터 해석
박상은(Sangeun Park),차한주(Hanju Cha) 대한전기학회 2016 전기학회논문지 Vol.65 No.5
This paper analyzes an LCL-type isolated dc-dc converter operating for constant output voltage in the continuous conduction mode(CCM) with resistances of parasitic losses –static drain-source on resistance of power switch, ESR of resonant network(L-C-L)-using a high loaded quality factor Q assumptions and fourier series techniques. Simple analytical expressions for performance characteristics are derived under steady-state conditions for designing and understanding the behavior of the proposed converter. The voltage-driven rectifier is analyzed, taking into account the diode threshold voltage and the diode forward resistance. Experimental results measured for a proposed converter at low input voltage and various load resistances show agreement to the theoretical performance predicted by the analysis within maximum 4% error. Especially in the case of low output voltages and large loads, It is been observed that introduction of both rectifier and the parasitic components of converter had considerable effect on the performance.
박상은 ( Sangeun Park ),오영수 ( Youngsoo Oh ) 한국경제교육학회 2015 경제교육연구 Vol.22 No.3
본 연구는 한국교육고용패널 4차년도 자료와 2008학년도 대학수학능력시험 정보를 이용하여 대학수학능력시험에서 일반사회 선택 학생의 특성을 비교분석한 것이다. 분석 결과는 첫째, 일반사회 과목별 선택집단의 대학수학능력시험 성적은 경제>법과 사회>정치>사회·문화의 순으로 나타났으며, 특히 경제 선택집단은 비선택집단에 비해 수학에 대한 성취감, 흥미도, 선호도가 높은 것으로 나타났다. 둘째, 경제 선택집단은 학업성적, 가정의 소득수준과 사교육 비율, 도시거주 비율이 높아 사회·문화 선택집단과 가장 대조적인 특성을 보였다. 셋째, 복수과목 선택 상황을 살펴보면, 경제와 사회·문화를 선택한 집단은 경제 선택집단의 특성을 보이는 반면 경제와 정치를 선택한 집단에서는 정치 선택집단의 특성이 강하게 나타났다. 넷째, 6개의 일반사회 과목 간 교집합 집단의 수능성적은 ‘경제&법과 사회’집단에서 가장 높은 것으로 나타났는데, 법과 사회의 경우, 복수로 선택한 과목에 따라 집단 특성에 큰 차이가 나타났다. This paper purposes to compare the characteristics of students who select Social Studies courses for College Scholastic Ability Test, using 4th Korea Education and Employment Panel data and 2008 College Scholastic Ability Test score data. Results are summarized as follows: First, students` SAT scores rank differently by their selection of courses among social studies. Students` SAT score turns out to be highest in Economics, followed by Law, Politics, and Sociology. In particular, students who select Economics show relatively higher degree of fulfillment, interest and preference in mathematics. Second, students selecting Economics show opposite characteristics to those selecting Sociology in academic records, income level, experiences of private lessons and residence area. Third, students who select Economics & Sociology simultaneously are more likely to have characteristics similar to that of Economics rather than Sociology group. On the contrary, students selecting Economics & Politics turn out to be more similar to the Politics group rather than Economics group. Fourth, students who select Economics & Law show the highest SAT score among six cross groups.