Magnetics design is often the most overlooked aspect of the design of power electronic converters. This is episode 9 of our 'Powerful Knowledge' series and we go into some depths of how to approach magnetics design using energy storage as a starting point with an example of a mains input 50W flyback converter running at 100kHz switching frequency.
We cover aspects such as winding structure, basic core loss modelling, impacting of fringing fields near the airgap and practical characterization.
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
segunda-feira, 10 de julho de 2023
segunda-feira, 5 de junho de 2023
급속충전기용 파워 모듈을 위한 단일단 AC-DC 컨버터 레덧탕1, 최세완✝ A Single-Stage AC-DC Power Module Converter for Fast-Charger Tat-Thang LE and Sewan Choi-The Transactions of the Korean Institute of Power Electronics, Vol. 27, No. 5, October 2022
급속충전기용 파워 모듈을 위한 단일단 AC-DC 컨버터 레덧탕1 , 최세완✝
A Single-Stage AC-DC Power Module Converter for Fast-Charger
Tat-Thang LE and Sewan Choi
The Transactions of the Korean Institute of Power Electronics, Vol. 27, No. 5, October 2022
Abstract
In this study, a single-stage, four-phase, interleaved, totem-pole AC-DC converter is proposed for a
super-fast charger station that requires high power, a wide voltage range, and bidirectional operation
capabilities and adopts various types of electric transport vehicles. The proposed topology is based on
current-fed push-pull dual active bridge converter combined with the totem-pole operation. Owing to the
four-phase interleaving effect, the bridge on the grid side can switch at 0.25, 0.5, and 0.75 to achieve a
ripple-free grid current. The input filter can be removed theoretically. Switching methods for the duty of the
secondary-side duty cycle are proposed, and they correspond to the primary duty cycle for reducing the
circulating power and handling the total harmonic distortion. Therefore, the converter can operate under a wide
voltage range. Experimental results from a 7.5 kW prototype are used to validate the proposed concept.
VIEW FULL TEXT:
3.3kW Bidirectional OBC Design with Active Clamp Flyback Converter Hyeok-Min Kwon, So-Jeong Kong, Jae-Hyuck Choi, Dae-Young Hong and Jun-Young Lee† Myongji University Electrical Engineering
3.3kW Bidirectional OBC Design with Active Clamp Flyback Converter
Hyeok-Min Kwon, So-Jeong Kong, Jae-Hyuck Choi, Dae-Young Hong and Jun-Young Lee†
Myongji University Electrical Engineering
액티브 클램프 플라이백 컨버터를 이용한 3.3kW 양방향 OBC 설계
권혁민, 공소정, 최재혁, 홍대영, 이준영†
명지대학교 전기공학과
ABSTRACT
본 논문은 3.3kW급 OBC에 사용되는 DC-DC 양방향
Flyback 컨버터를 제안한다. 기존 Flyback 컨버터에서 보조 스
위치를 사용한 회로를 적용하여 변압기 누설 값에 저장된 에너
지를 재활용하여 메인 스위치 전압 스파이크를 최소화하는 방
식을 사용했고 이를 대칭구조로 적용하였다. 모든 전력반도체
소자는 SiC-MOSFET을 적용하였다. 스위칭 주파수 70kHz 조
건에서 입력전압은 400V이며 배터리 전압 100V, 250V, 330V,
450V 네 구간에서 정상 동작을 확인하였으며 정방향 최대 효
율:97.58%, 역방향 최대 효율 97.48%를 달성하였다.
ABSTRACT
This paper proposes a DC-DC bi-directional flyback converter used in a 3.3kW class OBC. In the existing flyback converter, a circuit using an auxiliary switch was applied to recycle the energy stored in the transformer leakage value to minimize the main switch voltage spike, and this was applied in a symmetrical structure. All power semiconductor devices applied SiC-MOSFETs. Under the condition of the switching frequency of 70kHz, the input voltage was 400V, and normal operation was confirmed in four sections of battery voltage 100V, 250V, 330V, and 450V, and the maximum forward efficiency: 97.58% and the maximum reverse efficiency 97.48% were achieved.VIEW FULL TEXT:
sábado, 3 de junho de 2023
Three-Phase Single-Stage Bidirectional CCM Soft-Switching AC–DC Converter With Minimum Switch Count-Jaeyeon Lee , Hyeonju Jeong, Tat-Thang LE , Member, IEEE, and Sewan Choi , Fellow, IEEE
Abstract—In this article, a three-phase single-stage bidirectional
ac–dc converter with low component count is proposed.
The single-stage structure is configured by integrating a threephase
ac–dc converter and a three-phase dual active bridge converter.
The power factor correction and bidirectional power control
are performed by adjusting the modulation index of sinusoidal
pulse width modulation (SPWM) and phase-shift angle
between the primary and secondary bridges. The lowfrequency
components generated by SPWM are absorbed by
fundamental blocking capacitors connected in series with transformer
windings, resulting in true high-frequency isolation. The
proposed converter can achieve soft-switching of all switching
devices even in continuous conduction mode. A 110 Vac, 3 kW, 100
kHz prototype is implemented to validate the proposed concept and
demonstrated 95.34% peak efficiency.
Compact Integrated Transformer – Grid Inductor Structure for E-Capless Single-Stage EV Charger Ramadhan Muhammad Hakim, Huu-Phuc Kieu, Junyeong Park, Tat-Thang LE, Member, IEEE, Sewan Choi, Fellow, IEEE, Byeongseob Song, Hoyoung Jung, and Bokyung Yoon
Abstract—This paper proposes a planar magnetic integration technique that combines the grid inductors and transformer in the single-stage E-capless EV charger into one core. The proposed integration technique reduces the number of magnetic components; therefore, the cost, total magnetic core loss, and volume can be significantly reduced. Using the integrated structure, the overall converter power density increases up to 11.1% compared to the non-integrated one. This paper also presents a detailed analysis of the optimal PCB winding arrangement considering both AC resistance and winding stray capacitance. Due to the high DC resistance of PCB winding, Litz wire was also considered for the proposed integrated structure. The effectiveness of the proposed structure was validated by implementing it on a 3.7 kW prototype of a single-stage AC-DC converter. Results show that the prototype with the proposed integrated structure achieved higher efficiency with both PCB winding and Litz wire. Peak efficiency of 97.17% and 6.55 kW/L power density were achieved.
Index Terms—Planar cores, Electric vehicles, Battery chargers, AC-DC power converters
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