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- 저자 : Nabeel Naseem (검색결과 3 건)
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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.
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Automatic current balancing for two‑phase interleaved LLC resonant converter
Jeonghun Kim,Nabeel Naseem,Honnyong Cha 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3
This study proposes a novel balanced two-phase interleaved LLC resonant converter. The LLC resonant converter offers apromising solution for dc power conversion. This converter can achieve high efficiency and high-power density by implementingzero-voltage-switching (ZVS) for primary switches and zero-current-switching for secondary rectifier diodes. Theinput-parallel output-parallel systems that increase their power ratings by connecting two converters in parallel allow the use of low-current rated switches in high-current applications. Moreover, the input and output passive filter size requirements in the two-phase interleaved converters are reduced, and they provide higher power density and improved dynamic performance. However, the estimated tank gain characteristics become imbalanced due to the tolerances and the inevitable mismatch of the resonant parameters. Accordingly, this system operates outside the ZVS region, and a severe current imbalance with thermal runaway will occur. The proposed method achieves the perfect balance of input, output, and tank currents utilizing the existing resonant inductor magnetics without additional active or passive components, expensive sensors, and dedicated control schemes. The proposed method retains the advantages of the conventional LLC resonant converter over the operating frequency range. Mathematical analysis and experimental results are presented to validate the performance of the proposed method.
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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.
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