• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.62-63
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• 2011

The wireless power transfer system using electromagnetic resonance is consists of PFC circuit, LLC resonant converter, high frequency DC-AC inverter and ECR devices for wirelessly transmitting the power. The output voltage of the module with free input voltage is 1MHz, 230Vp-p. As a experimental result, the wireless power transmission is confirmed and it is varified the validity of the experiment.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.348-350
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• 2008

A link voltage adjustment converter employing load power estimator for notebook computer adaptor is proposed. It is consisted of the boost converter as a power factor correction stage and the LLC resonant converter as a DC/DC conversion stage with a newly introduced link voltage adjustment method employing load power estimator, which helps to reduce the transformer size and peak of output voltage ripple, maintaining high efficiency over all the load condition. Experimental results with 85W converter are given to verify the validity of the proposed circuit.

• 전력전자학회논문지
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• 제20권3호
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• pp.223-231
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• 2015

LEDs have been widely used in lighting displays, automobiles, and airplanes owing to their excellent light output characteristics and long lifespan. Though LEDs are manufactured under the same process, variations in impurity concentrations cause electrical deviation among LEDs. The resulting electrical deviation can not only reduce the life time of the LED but also cause non-uniform luminance of LEDs connected in parallel. LED driving circuit is required to solve these problems. In this paper, we propose a LED driving system using Y-type current balancing transformer to maximize the efficiency of the system by removing output stage Schottky diodes. Experimental results are presented to verify the performance of proposed LED driving system that is applied to 80 W LED modules.

• Journal of Power Electronics
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• 제16권3호
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• pp.1236-1243
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• 2016

This paper presents the analysis and design of an active electromagnetic interference (EMI) filter (AEF) for the common-mode (CM) noise reduction of switching power converters. The features of the several types of AEFs are discussed and compared in terms of implementation. The feed-forward AEF with a voltage-sensing and voltage-cancellation (VSVC) structure is implemented for an LLC resonant converter to replace a multiple-stage passive EMI filter and thereby reduce CM noise. The characteristics and performance of the VSVC-type AEF are investigated through theoretical and experimental works.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.157-158
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• 2013

본 논문은 넓은 범위에서 변화하는 입력 전압과 출력 전류 조건에서 동작하는 디지털 제어 방식 공진형 DC-DC 컨버터의 동특성 개선에 대해 기술한다. LLC 직렬 공진형 컨버터의 아날로그 전력 변환단 동특성을 기반으로 150W 디지털 공진형 컨버터 실험보드에 적용하여 아날로그 제어 방식과 디지털 제어방식의 폐루프 성능을 비교한다. 디지털 제어기는 Emulation 방식을 이용하여 설계한다. 제어기 설계의 이론 검증 및 분석은 PSIM Simulation과 실험 측정으로 비교 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 하계학술대회 논문집
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• pp.104-107
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• 2007

Among the alternative energy sources, the solar energy is recognized as an important energy source and its application is increasing. Especially in future, the hybrid solar energy generation system with battery will be widely used as an independent distributed power generation system. In this paper, a solar power hybrid home generation system using a contact-less power supply (CPS) that can transfer an electric power without any mechanical contact by using magnetic coupling instead of the power transfer by directly supplying the DC power to the home electric system is proposed. The proposed system consists of a ZVS boost converter, a half bridge LLC resonant converter and contact-less transformer.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 추계학술대회 논문집
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• pp.57-60
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• 2008

Recently, new technologies of the PCS (Power Conditioning System) for energy generating using solar cells or fuel cell are required for smaller unit with low cost and high performance. In this paper, the proposed high frequency AC linked DC/AC converter which consisted of LLC resonant and LF cycloconverter is presented, described and verified through the experimental results of 1kW PCS.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.421-422
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• 2012

본 논문은 넓은 범위에서 변화하는 입력 전압과 출력 전류 조건에서 동작하는 공진형 직류-직류 컨버터의 디지털 제어기 해석 및 설계에 대해 기술한다. LLC 직렬 공진형 컨버터의 전력 변환단 동 특성을 기반으로 디지털 제어기를 해석 및 설계하고, DSP 기능을 내장한 16 비트 마이크로 컨트롤러를 이용하여 제어기를 구현한다. 개발된 디지털 제어기를 150W 공진형 컨버터 보드에 적용하여 설계 이론을 실험적으로 검증하고, 종래의 아날로그 제어기를 적용한 컨버터와의 장단점과 동 특성을 비교 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 추계학술대회
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• pp.62-63
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• 2010

This paper presents a potential for application of Inductive Power Transfer(IPT) to the light railway vehicle system. IPT system allows for a vehicle fitted with existing or new generation batteries to park over a small charging unit and commence charging immediately. Regular charging will allow for smaller batteries to be used in vehicles. In this paper, IPT system uses a full-bridge LLC resonant converter and is possible for the regenerative braking which is an energy recovery mechanism.

• 전력전자학회논문지
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• 제28권1호
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• pp.39-47
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• 2023

This paper applies a structural technique with uniform parallel switch characteristics in gates and power loops to minimize the ringing and current imbalance that occurs when a general discrete package (TO-247)-based power semiconductor device is operated in parallel. Also, this propose a heat sink integrated switching module with heat sink design flexibility and high power density. The developed heat dissipation-integrated switching module verifies the symmetry of the parasitic inductance of the parallel switch through Q3D by ansys and the validity of the structural technique of the parallel switch using the LLC resonant converter experiment operating at a rated capacity of 7.5 kW.