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Distributed Impedance Network (Z-Network) DC–DC Converter
Honnyong Cha,Fang Zheng Peng,Dong-Wook Yoo IEEE 2010 IEEE transactions on power electronics Vol. No.
<P>This paper presents a novel dc-dc converter incorporating a distributed impedance-source network (Z-source network, or Z-network) to achieve the buck (step-down) and boost (step-up) function of a transformer-isolated dc-dc converter. In this paper, the distributed impedance source network composed of an array of inductors and capacitors is coupled between power source and main switching devices. The great and unique feature about the distributed impedance source network dc-dc converter is that unlike the traditional V-source or I-source converters, it can be open- and short-circuited without damaging switching devices. Therefore, the desired buck and boost function can be achieved. Moreover, converter reliability can be greatly improved. A dc-dc converter using this proposed concept is built and tested. Its performances are verified with experimental results.</P>
An Improved Energy Recovery Clamp Circuit for PWM Converters with a Wide Range of Input Voltage
Honnyong Cha,Lihua Chen,Fang Z. Peng,Qingsong Tang 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A full-bridge dc-dc converter employing diode rectifier in the output experiences severe voltage overshoot and oscillation problem across the diode rectifier caused by the interaction between the junction capacitance of the rectifier diode and the leakage inductance of transformer. The pronounced reverse-recovery current of high power diodes enforces these issues significantly by increasing power loss and voltage overshoot. Conventional energy recovery clamping circuits suffer from high voltage overshoot if the input voltage of converter is wide. In this work, a novel energy recovery clamp circuit is proposed to overcome this problem. Performance of the proposed circuit is verified both theoretically and experimentally with a 70 ㎾ dc-dc converter.
차헌녕(Honnyong Cha),이종필(Jong-Pil Lee),이경준(Kyung-Jun Lee),김태진(Tae-Jin Kim),유동욱(Dong-Wook Yoo) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
본 논문은 최소의 스위칭 소자를 이용한 절연형 Full-Bridge (FB) buck-boost DC-DC 컨버터를 제안한다. 기존의 dual-bridge 방식을 이용한 buck-boost 컨버터와는 달리 본 논문에서 제안한 방식은 변압기 1차측에만 스위칭 소자를 사용하고 2차측에는 다이오드 정류기를 사용한다. 필요한 buck-boost 기능을 구현하기 위하여 입력단에 2개의 인덕터를 추가하여 2phase interleaved 방식으로 동작을 한다. 500 W 의 prototype을 제작하여 본 논문에서 제안한 방식의 타당성을 실험적으로 검증 한다.
Practical Layouts and DC-Rail Voltage Clamping Techniques of Z-Source Inverters
Cha, Honnyong,Li, Yuan,Zheng Peng, Fang Institute of Electrical and Electronics Engineers 2016 IEEE transactions on power electronics Vol. No.
<P>The Z-source inverters (ZSIs) have many advantages over the conventional voltage-fed and current-fed inverters, and extensive research works are conducing recently. However, relatively difficult physical layouts of the Z-source networks make them less attractive in the industry applications. A good hardware design is important to handle with the inherent long high-frequency loop in order to avoid generating severe voltage overshoot in the dc-rail voltage of the ZSIs. In this paper, the high-frequency loops in various ZSIs are investigated. A dc-rail voltage clamping technique for magnetically coupled impedance source converters is proposed by using an intuitive circuit modification and addition of a clamping diode. The proposed technique is verified through simulation and experiment.</P>
Z-소스 인버터와 부스트 DC-DC 컨버터의 회로적인 유사성
차헌녕(Honnyong Cha),김흥근(Heung-Geun Kim),최병조(Byungcho Choi) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
2003년에 처음 Z-소스 인버터가 소개된 후 이와 관련된 많은 연구결과물들이 현재 학계에 소개 되고 있다. 본 논문은 최근 산업계에서 이슈화 되고 있는 Z-소스 인버터와 최근 개발된 몇 가지 Z-소스 인버터들을 소개하고 이러한 Z-소스 인버터들이 기존의 부스트 DC-DC 컨버터들과 많은 회로적인 유사성을 가지고 있음을 소개한다. 이를 통해 Z-소스 인버터의 동작원리를 좀 더 자세히 이해하고 전력전자를 공부하는 신진 연구자들에게 새로운 Z-소스 인버터를 개발할 수 있는 기회를 제공하고자 한다.
Parallel Operation of Trans-Z-Source Inverter
Dongsul Shin,Honnyong Cha,Jong-Pil Lee,Dong-Wook Yoo,Fang Z. Peng,Heung-Geun Kim 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Recently, there is a strong demand for high power conversion system in power electronics area especially in photovoltaic (PV) power conditioning system (PCS), wind power generation, and fuel cell power generation system. However, there is a limit in increasing power level mainly due to the limitations in switching device’s voltage and current rating. One way to solve this problem is to connect power converters in parallel. Parallel operation of inverter has many advantages such as modularity, ease of maintenance, (n+1) redundancy, high reliability, etc. This paper presents parallel operation of voltage-fed-trans-Z-source inverter. A 2.6 ㎾ prototype inverter is built and tested to verify performances of the proposed inverter.
Ubaid Ahmad,Honnyong Cha,Nabeel Naseem,Duc-Tuan Do 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Input-parallel output-parallel (IPOP) connected converter system allows the use of low power converter modules for high power applications. In this paper, a reliable integrated current balancing transformer (ICBT) is proposed for the current balancing requirement of IPOP LLC resonant converter modules. The proposed ICBT based IPOP LLC resonant converter modules ensures both input current sharing (ICS) and output current sharing (OCS) in constituent modules, without dedicated controller. The proposed ICBT is basically the resonant inductors of LLC resonant converter modules, coupled to perform the function of current balancing, and also have enough leakage inductance for resonance operation simultaneously. Moreover, the proposed ICBT can significantly reduce the overall magnetic volume, and increase the power density of IPOP LLC resonant converter modules. Magnetic and electrical models of the proposed ICBT have been presented in this paper. To validate the performance of the proposed ICBT based IPOP LLC resonant converter modules, a 2.5 kW hardware prototype has been designed, fabricated and tested successfully.
Fazal Akbar,Honnyong Cha,Seunghoon Lee,Tien-The Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, a new single-phase single-stage transformerless inverter is proposed for grid-tied and standalone applications. The proposed inverter has low leakage current and is capable to perform both buck and boost functions. Further, as compared to the conventional state of art buck-boost inverters, it can achieve high power density because the magnetic volume is reduced significantly. High power conversion efficiency with reduced EMI concerns can be realized because only one switch operates at high frequency. Moreover, there is no need for generating high frequency deadtime because all the remaining switches operate at line frequency. In order to verify the proposed topology, a laboratory prototype is designed for 500 W and the experimental results are provided as well.
Nabeel Naseem,Honnyong Cha,Ubaid Ahmad,Heung-Geun Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper integrated magnetic current balancing (IMCB) cell-based asymmetrically configured Quad-Active-Bridge (QAB) converter is proposed. QAB converter provides high-frequency isolation for a dc-dc stage of solid-state-transformer (SST), as well as provides a modular solution to the SST medium-voltage (MV) dc link. The proposed IMCB cell ensures the current balancing among the three active H-bridges without using any dedicated controller when transferring equal power from MV to low voltage (LV) side. The proposed IMCB cell is the integration of three inductors of the active H-bridges required for power transfer and zero voltage switching (ZVS), which doesn’t require extra magnetic volume. Simulation and experimental results are presented to validate the performance.