• 전력전자학회논문지
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• 제18권3호
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• pp.247-255
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• 2013

In this paper, a soft switching DC-DC converter for AC module type photovoltaic (PV) module integrated converter is proposed. A push-pull converter is suitable for a low voltage PV AC module system because the step-up ratio of a high frequency transformer is high and the number of primary side switches is relatively small. However, the conventional push-pull converters do not have high efficiency because of high switching losses by hard switching and transformer losses (copper and iron losses) by high turns-ratio of the transformer. In the proposed converter, primary side switches are turned on at zero voltage switching (ZCS) condition and turned off at zero current switching (ZVS) condition through parallel resonance between secondary leakage inductance of the transformer and a resonant capacitor. Therefore the proposed push-pull converter decreases the switching loss using soft switching of the primary switches. Also, the turns-ratio of the transformer can be reduced by half using a voltage-doubler of secondary side. The theoretical analysis of the proposed converter is verified by simulation and experimental results.

• 한국정보통신학회논문지
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• 제8권5호
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• pp.1068-1073
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• 2004

전원장치의 소형화 핵심기술인 반도체 스위칭 기술을 이용하여 5 V/500 mA급 트랜스리스형 파워모듈(transless type power module)을 설계하였다. 파워 모들은 강압형 chopper 방식을 이용하였으며, 스위칭회로, 제어회로, 전압검출회로, 그리고 정전압 회로 등으로 구성되어 었다. 본 연구에서 설계한 스위칭 파워모듈은 0.2 V의 load regulation, 0.1 V의 line regulation, 85 mVp-p의 output ripple 전압, 64.7 kHz의 스위칭 주파수, 최대 58% 정도의 효율을 나타내었으며, 신뢰성 및 EMC 평가항목을 만족하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.758-761
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• 2003

전원장치의 소형화 핵심기술인 반도체 스위칭 기술을 이용하여 단일 전원을 사용하는 소형, 경량화 전자기기에 적합한 5 V/500 mA급 트랜스리스형 파워 모듈(transless type power module)을 설계하였다. 파워 모듈은 강압형 chopper 방식을 이용한 스위칭회로, 제어회로, 전압검출회로, 그리고 정전압 회로 둥으로 구성되어 있으며, 하이브리드-집적회로형(hybrid-IC type)으로 제작되었다. 본 연구에서 설계한 스위칭 레귤레이터 전원회로는 5 V/500 mA급 트랜스리스형 파워 모듈의 전기적 특성을 만족하였다.

• Journal of international Conference on Electrical Machines and Systems
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• 제3권4호
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• pp.465-471
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• 2014

This paper proposes a new switching algorithm for an active clamp snubber to improve the efficiency of a module integrated converter system. This system uses an active clamp method for the snubber circuit for the efficiency and reliability of the system. However, the active clamp snubber circuit has the disadvantage that system efficiency is decreased by switch operating time because of heat loss in resonance between the snubber capacitor and leakage inductance. To address this, this paper proposes a new switching algorithm. The proposed algorithm is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time. Also, the snubber switch is operated at zero voltage switching by turning on the snubber switch before main switch turn-off. Simulation and experimental results are presented to show the validity of the proposed new active clamp control algorithm.

• 마이크로전자및패키징학회지
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• 제4권1호
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• pp.31-38
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• 1997

대용량, 고속정보처리가 요구되는 B-ISDN용 스위칭 모듈은 90년초부터 MCM으로 제작후 사용되어 왔다. 특히 MCM은 Data 처리의 고속성 및 회로의 고집적이 요구되는 ATM, GPS 및 개인휴대 통신 분야에 광범위하게 개발 및 응용되고 있다. 따라서 본논문에 서는 고속, 고집적 ATM 교환기의 Switching Module을 제품의 Low Cost와 다충회로를 간 단하게 구현할수 있는"Diffusion patterning"(이하 DP)공정과 기보유중인 Thin Film 공정으 로 MCM을 구현하였다.CM을 구현하였다.

• 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.

• 전기학회논문지P
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• 제67권2호
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• pp.63-69
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• 2018

In this paper, the operation principle of a bi-directional switch type resonant AC link snubber circuit was described, together with the practical design procedure, which employs in the proposed power module bridge package type resonant AC link snubber. The novel prototype of power module bridge package type resonant AC link snubber-assisted voltage type sinewave soft switching PWM inverter using IGBT power module was demonstrated herein. It was verified that both the auxiliary power switches in this resonant AC link snubber circuit and the main power switches commutate under the condition of soft switching commutation principle. In addition, the power losses of the new soft switching inverter treated here were analyzed by implementing the experimental data of the IGBT and diode v-i characteristics in addition to switching power loss characteristics into our original computer simulation software developed by the authors. Then, the voltage type sinewave soft switching PWM inverter was high efficiency than that of hard switching PWM inverter, along with performance operation waveforms. In the future, the comparative feasibility study of power module bridge type resonant AC link snubber and its related soft switching inverter in addition to the other types resonant snubber assisted soft switching inverter should be done from a practical point of view.

• Journal of Power Electronics
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• 제4권2호
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• pp.77-86
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• 2004

This paper presents a novel three-phase power module bridge type auxiliary resonant AC link snubber for the three-phase voltage-fed sinwave soft switching PWM inverter operating under specific instantaneous space voltage vector modulation. The operating principle of this resonant snubber is described for current source load model during one switching period, along with its design approach based on the simulation data. The performance evaluations of space vector modulation three-phase sinewave soft switching inverter with a new three-phase active auxiliary resonant AC link snubber are discussed as compared with those of three-phase voltage source-fed sinewave hard switching PWM inverter with a standard space voltage vector modulation strategy. The power loss analysis and conventional efficiency estimation of three-phase soft switching PWM inverter using ICBT modules are carried out including all the conduction power losses based upon the measured v-i characteristics of IGBT and its antiparallel diode as well as their switching losses.

• 한국산학기술학회논문지
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• 제18권5호
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• pp.151-159
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• 2017

현대전의 양상은 점차 네트워크 중심전으로 변화해가고 있으며, 이의 중심인 정보 전자전 역시 나날이 발전하는 모습을 보이고 있다. 최근 국산화에 성공한 국내 지상용 전자전장비는 운용환경의 특성상 고지대와 강한 풍속, 상고대 등의 영향을 많이 받는다. 따라서 ES 장비의 마스트와 안테나를 연결하는 안테나전환기의 구조적 신뢰성은 가장 중요한 부분이라 할 수 있다. 본 논문에서는 안테나전환기의 구조분석 및 환경적 영향성을 분석하여 기존의 안테나전환기 구조보다 향상된 ES안테나 구조 지지능력을 가진 안테나전환기를 제안하였다. 안테나전환기의 용접방식의 변경과 보강 블록부를 통하여 개선된 구조를 시뮬레이션하고 하중시험을 통해 안테나전환기의 구조개선 타당성을 검증하였다. 시뮬레이션 결과 개선된 안테나 전환기 용접부 및 보강블럭부의 안전율은 기준 보다 각 5.3배, 1.5배의 높은 안전율을 확보한 것으로 확인되었다. 시제품에 대한 하중시험을 181kg까지 진행한 결과 용접부의 경우 3.7 Mpa, 보강블럭 부위는 64.4Mpa 정도가 측정되었다. 이 시험 결과는 구조 해석한 시뮬레이션 결과값과 유사한 것으로 제안한 안테나전환기의 하중지지 능력이 기존 대비 향상된 것으로 판단된다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.507-510
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• 2003

This paper presents a novel prototype of tile three-phase bridge power block module type a auxiliary resonant AC link snubber circuit, which is effectively used for the three-phase voltage source type sinewave soft switching PWM inverter using IGBTs. Its operating principle Is described for current source load model, along with its practical design approach based on the simulation data. The performance evaluation of the three-phase voltage source type snewave soft switching PWM inverter incorporating a single three-phase bridge mo여le of active auxiliary resonant AC link snubber treated here Is illustrated, which is concerned with power duality efficiency power loss analysis. This inverter is discussed as compared with those of tile three-phase voltage source type sinewave hard switching PWM inverter. The power loss analysis of this soft switching PWM Inverter using IGBT power modules is evaluated on the basis of the measured v-i characteristics and switching power losses of IGBT, and antiparaliel diodes. The practical effectiveness of this inverter is proven by the power loss analysis for distributed power supply.