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SiC 전력반도체의 병렬 구동 시 전류 불균형을 최소화하는 Mezzanine 구조의 방열일체형 스위칭 모듈 개발
이정호,민성수,이기영,김래영 전력전자학회 2023 전력전자학회 논문지 Vol.28 No.1
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.
전기자동차 급속충전기용 넓은 전압 범위를 갖는 30kW급 SiC MOSFET 기반 고속 스위칭 LLC 컨버터 설계 및 병렬 운전
이기영,민성수,박수성,조영찬,이상택,김래영 전력전자학회 2022 전력전자학회 논문지 Vol.27 No.2
The electrification trend of mobility increases every year due to the development of power semiconductor and battery technology. Accordingly, the development and distribution of fast chargers for electric vehicles (EVs) are in demand. In this study, we propose a design and implementation method of an LLC converter for fast chargers. Two 15 kW LLC converters are configured in parallel to have 30 kW rated output power, and the control algorithm and driving sequence are designed accordingly and verified. In addition, the improved power conversion efficiency is confirmed through zero-voltage switching (ZVS) of the LLC converter and reduction of turn-off loss through snubber capacitors. The implemented 30 kW LLC converters show a wide output voltage range of 200–950 V. Experiments applying various load conditions verify the converter performance.
유도 가열 시스템에서 SiC MOSFET과 GaN Transistor의 성능 비교를 통한 소자 적합성 분석
차광형,주창태,민성수,김래영 전력전자학회 2020 전력전자학회 논문지 Vol.25 No.3
In this study, device suitability analysis is performed by comparing the performance of SiC MOSFET and GaN Transistor, which are WBG power semiconductor devices in the induction heating (IH) system. WBG devices have the advantages of low conduction resistance, switching losses, and fast switching due to their excellent physical properties, which can achieve high output power and efficiency in IH systems. In this study, SiC and GaN are applied to a general half-bridge series resonant converter topology to compare the conduction loss, switching loss, reverse conduction loss, and thermal performance of the device in consideration of device characteristics and circuit conditions. On this basis, device suitability in the IH system is analyzed. A half-bridge series resonant converter prototype using the SiC and GaN of a 650-V rating is constructed to verify device suitability through performance comparison and verified through an experimental comparison of power loss and thermal performance.
GaN HEMT의 안정적 구동을 위한 수직 격자 루프 구조의 기생 인덕턴스 저감 설계 기법
양시석,소재환,민성수,김래영 전력전자학회 2020 전력전자학회 논문지 Vol.25 No.3
This paper presents a parasitic inductance reduction design method for the stable driving of GaN HEMT. To reduce the parasitic inductance, we propose a vertical lattice loop structure with multiple loops that is not affected by the GaN HEMT package. The proposed vertical lattice loop structure selects the reference loop and designs the same loop as the reference loop by layering. The design reverses the current direction of adjacent current paths, increasing magnetic flux cancellation to reduce parasitic inductance. In this study, we validate the effectiveness of the parasitic inductance reduction method of the proposed vertical lattice loop structure.
넓은 출력전압을 가지는 전기자동차 초급속충전용 30kW 파워모듈 구현
이상혁(Sang-Hyeok Lee),민성수(Sung-Soo Min),박해찬(Hae-Chan Park),조영찬(Young-Chan Cho),이상택(Sang-Taek Lee),김래영(Rae-Young Kim),이기영(Gi-Young Lee) 대한전기학회 2023 전기학회논문지 P Vol.72 No.2
Although the sales volume is increasing yearly due to the improved technological maturity of electric vehicles (EVs), the charging infrastructure is insufficient. In addition, localization and technology development for power modules in a fast charging system is required. In this paper, a design and implementation of a power module for an EV ultra-fast charging system are proposed. In the power module, which has a 30 kW maximum power capacity, the AC/DC rectifier stage uses a Vienna rectifier topology, and the isolated DC/DC converter stage uses an LLC resonant converter topology. The LLC resonant converter controls the output voltage to respond to a wide output voltage of 150V to 1000V. In addition, in order to realize a wide output voltage range, a single relay is used on the secondary side of the LLC resonant converter to achieve a wide voltage range through the predefined two-mode selection. The validity and reliability of the proposed power module are verified through the experimental results for various load conditions.