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Qingnan Li,Michael A. E. Andersen,Ole C. Thomsen 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Nowadays, efficiency and power density are the most important issues for Power Factor Correction (PFC) converters development. However, it is a challenge to reach both high efficiency and power density in a system at the same time. In this paper, taking a Bridgeless PFC (BPFC) as an example, a useful compromise between efficiency and power density of the Boost inductors on 3.2㎾ is achieved using an optimized design procedure. The experimental verifications based on the optimized inductor are carried out from 300W to 3.2㎾ at 220Vac input.
Two-Phase Interleaved Buck Converter with a new Digital Self-Oscillating Modulator
Lars T. Jakobsen,Michael A. E. Andersen 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a new Digital Self-Oscillating Modulator (DiSOM) for DC/DC converters. The DiSOM modulator alllows the digital control algorithm to sample the output voltage at a sampling frequency higher than the converter switching frequency. This enables higher control loop bandwidth than for traditional digital PWM modulators given a certain switching frequency. A synchronised version of the DiSOM modulator is derived for interleaved converters. A prototype interleaved Buck converter for Point of Load applications has been designed and built to test the performance of DiSOM modulator. The DiSOM modulator and a digital control algorithm have been implemented in an FPGA. Experimental results show that the converter has a very fast transient response when a loadstep is applied to the output. For a loadstep of 50% of nominal output current the output voltage overshoot is less than 2.5% of the nominal output voltage and the settling time is just 8 switching periods.
Research of Gap Filler Material in the GaN Transistor Thermal Management
Bainan Sun,Niels Elkjær Iversen,Zhe Zhang,Michael A.E. Andersen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
High power dissipation in the small package Gallium Nitride (GaN) transistor calls for challenge in thermal design. This paper compares the impact of different gap filler materials in the GaN transistor power dissipation. Simulation and experimental results are given to reveal the maximum power dissipated in each setup, which validates the critical impact of gap filler material in thermal design. The developed test procedure and thermal model are elaborated, which can be easily applied to the estimation of thermal management in other GaN transistor applications.
An Integrated Three-phase Transformer for Partial Parallel Dual Active Bridge Converter
Jiasheng Huang,Zhe Zhang,Yudi Xiao,Bainan Sun,Michael A.E. Andersen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, an integrated three-phase transformer is utilized in the partial parallel dual active bridge (PPDAB) converter. Due to the symmetrical structure, the flux generated by the primary windings is equally distributed to the three outer legs. Given the same number of turns of the windings in each parallel modules, the ac currents can inherently balance in the parallel modules. In order to enlarge the leakage inductor to serve as the interfacing ac inductor in the PPDAB converter, the coupling between the primary windings and secondary windings is weakened by placing the primary and secondary windings on the center and outer legs, respectively. Compared to the discrete three-phase transformers, the winding loss will also decrease with the proposed structure. A 1kW 400V/50V 500 kHz prototype with an efficiency of 96.72% is built and tested to verify the theoretical analysis.
Isolated Boost Converter with Bidirectional Operation for Supercapacitor Applications
Hernandez, Juan C.,Mira, Maria C.,Sen, Gokhan,Thomsen, Ole C.,Andersen, Michael A.E. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.
Isolated Boost Converter with Bidirectional Operation for Supercapacitor Applications
Juan C. Hernandez,Maria C. Mira,Gokhan Sen,Ole C. Thomsen,Michael A. E. Andersen 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4
This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.