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Half-bridge 직렬공진 컨버터 적용 무접점 전원장치의 효율분석
이현관(Hyun-Kwan Lee),김은수(Eun-Soo Kim),김윤호(Yoon-Ho Kim),송환국(Hwan-Kuk Song),강성인(Sung-In Kang) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8㎝) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss in contact-less power supply (CPS). In this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is analyzed and simulated. The results are verified on the simulation based on the theoretical analysis and the 2.5㎾ experimental prototype.
변압기 2차측 LLC 직렬공진컨버터 적용 승압형 DC/DC 컨버터
이현관(Hyun-Kwan Lee),이기식(Gi-Sik Lee),정봉근(Chung-Bong Geon),공영수(Young-Su Kong),김은수(Eun-Soo Kim),차인수(In-Su Cha),윤정필(Jeong-Phil Yoon) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
Recently, the high frequency isolated boost DC/DC converter has been widely used for the PCS (Power Conditioning System) system because of its small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have the problems such as the high conduction losses and the surge voltage due to the high circulating current and the leakage inductance, respectively. To overcome this problems, in this paper the secondary LLC resonant converter is proposed, and the experimental results of the secondary LLC series resonant converter for boost DC/DC converter are verified on the simulation based on the theoretical analysis and the l㎾ experimental prototype.
Half-bridge 직렬공진 컨버터 적용 무접점 전원장치 효율특성
李賢官(Hyun-Kwan Lee),宋煥國(Hwan-Kook Song),金恩洙(Eun-Soo Kim),金倫鎬(Yoon-Ho Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.5
Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8㎝) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss and the high voltage gain characteristics for load variations in contact-less power supply (CPS). To consider these characteristics, in this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is presented, described and verified through theoretical analysis, computer simulation and experimental test of 2.5㎾ prototype.
이현관(Hyun-kwan Lee),이우람(Woo-Ram Lee),김성륜(Seong-Lyun Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
Network coding is a new research area that may have interesting applications in actual networks. As decent studies have shown that data can be transferred at the maximum achievable throughput in a network by using network coding. In this paper, we focus on analysis in throughput deterioration because of retransmission. We applied various transmission scenarios with the simplest retransmission algorithm, and we found that network coding is not the best way to increase the throughput in the noisy environment.
PDP의 유지 전원을 위한 고효율 LLC 직렬 공진컨버터
이현관(Hyun-Kwan Lee),이기식(Gi-Sik Lee),강성인,공영수(Young-Su Kong),김은수(Eun-Soo Kim),임대호(Dae-Ho Lim),허동영(Dong-Young Huh),장병철(Byoung-Chul Jang) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
The LLC series resonant converter with a LLT(Inductor-Inductor-Transformer)transformer for PDP V sustaining power supply is presented. LLT transformer used to combine the inductor and transformer into one unit has the increased leakage inductance in the primary and secondary due to the winding method and the use of the gaped core. The increased leakage inductance in the primary and secondary of LLT transformer can be impacted on the DC voltage gain characteristics of LLC series resonant converter. In this paper, DC gain characteristics and the experimental results of the LLC series resonant converter with a LLT transformer are verified on the simulation based on the theoretical analysis and the 400W experimental prototype.
이현관(Hyun-Kwan Lee),김은수(Eun-Soo Kim),차인수(In-Su Cha),윤정필(Jeong-Phil Yoon),송환국(Hwan-kuk Song),강성인(Sung-In Kang),정봉근(Bong-Geon Chung) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
Recently, the isolated high frequency boost DC/DC converter has been used widely for PCS (Power Conditioning System) because of the requirements of small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have some problems like high conduction losses and high surge voltage due to high circulating current and leakage inductance, respectively. To improve these problems, a novel secondary LLC (called SLLC) series resonant converter is proposed in this paper and its theoretical analysis, its operating waveforms, simulation and experimental results for a boost DC/DC converter using SLLC series resonant topology verifies the proposed topology. 800W experimental prototype is designed and tested.
이현관(Hyun-Kwan Lee),이기식(Gi-Sik Lee),정봉근(Bong-Geun Chung),강성인(Sung-In Kang),공영수(Young-su Kong),김은수(Eun-Soo Kim),김윤호(Yoon-Ho Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8㎝) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss in contact-less power supply (CPS). In this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is analyzed and simulated. The results are verified on the simulation based on the theoretical analysis and the 1.8㎾ experimental prototype.
변압기 2차측 LLC 직렬공진컨버터 적용 승압형 DC/DC 컨버터
李賢官(Hyun-Kwan Lee),金恩洙(Eun-Soo Kim),車仁洙(In-Su Cha),李奇植(Gi-Sik Lee),丁烽根(Bong-Geun Chung),姜聲仁(Sung-In Kang) 대한전기학회 2006 전기학회논문지 B Vol.55 No.8
Recently, the high frequency isolated boost DC/DC converter has been widely used for the PCS (Power Conditioning System) system because of its small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have the problems such as the high conduction losses and the surge voltage due to the high circulating current and the leakage inductance, respectively. To overcome this problems, in this paper the secondary LLC resonant converter is proposed, and the experimental results of the secondary LLC series resonant converter for boost DC/DC converter are verified on the simulation based on the theoretical analysis and the 700W experimental prototype.
활성화 함수의 이득 가변화를 이용한 역전파 알고리즘의 성능개선
정성부,이현관,엄기환,Chung, Sung-Boo,Lee, Hyun-Kwan,Eom, Ki-Hwan 대한전자공학회 2001 電子工學會論文誌-CI (Computer and Information) Vol.38 No.6
In order to improve the several problems of the general backpropagation, we propose a method using a fuzzy logic system for automatic tuning of the activation function gain in the backpropagation. First, we researched that the changing of the gain of sigmoid function is equivalent to changing the learning rate, the weights, and the biases. The inputs of the fuzzy logic system were the sensitivity of error respect to the last layer and the mean sensitivity of error respect to the hidden layer, and the output was the gain of the sigmoid function. In order to verify the effectiveness of the proposed method, we performed simulations on the parity problem, function approximation, and pattern recognition. The results show that the proposed method has considerably improved the performance compared to the general backpropagation. 일반적인 역전파 알고리즘의 여러 가지 문제점들을 개선하기 위하여 활성화 함수의 이득을 퍼지 로직 시스템을 이용하여 자동 조절하는 방식을 제안하였다. 퍼지 로직 시스템을 구성하기 위하여 먼저 활성화 함수의 이득의 변화가 학습율, 연결강도 바이어스 등의 변화와 등가인 관계를 조사하였다 퍼지 로직 시스템의 입력은 마지막층에 대한 오차의 감도와 은닉층에 대한 오차의 평균 감도를 사용하였고, 출력은 활성화 함수의 이득을 사용하였다. 제안한 방식과 일반적인 역전파 알고리즘을 패리티 문제, 함수 근사화 문제 및 패턴 인식 문제등에 대하여 시뮬레이션하여 비교 검토한 결과 수렴비, 평균 학습 반복수, 정말도 및 새로운 입력 에 대한 원하는 오차 범위의 출력을 얻는 등의 성능이 개선됨을 알았다.