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RISS 인기검색어
- 검색키워드
- 저자 : Jun Imaoka (검색결과 3 건)
- 무료
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Analysis of Coupled-Inductor Configuration for an Interleaved High Step-Up Converter
Wilmar Martinez,Jun Imaoka,Yuki Itoh,Masayoshi Yamamoto,Kazuhiro Umetani 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power density. Therefore, a novel two-phase interleaved high step-up converter is proposed in order to minimize additional circuit volume used to achieve large voltage gain. The proposed converter addresses the purpose by a particular coupled inductor where three windings are installed in one or two cores. As a result, the proposed converter can achieve higher voltage gain than the conventional topologies by adding a winding and two diodes to the interleaved two phase boost chopper, besides the coupled-inductor configuration. This paper evaluates two arrangements of the coupled-inductor configuration of the proposed high step-up converter: 1. Three windings integrated in only one core and 2. Two independent inductors with a shared winding. The result revealed that the proposed converter shows higher voltage gain than the normal boost converter and the magnetic integration in the coupled-inductor configuration further increases the voltage gain by 20%.
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EMI Prediction and Reduction of Zero-Crossing Noise in Totem-Pole Bridgeless PFC Converters
Zhang, Baihua,Lin, Qiang,Imaoka, Jun,Shoyama, Masahito,Tomioka, Satoshi,Takegami, Eiji The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
In this study, a zero-crossing spike current issue in a totem-pole bridgeless power factor correction (PFC) converter is comprehensively investigated for the first time. Spike current occurs when input voltage crosses zero, becomes a noise source, and causes severe common mode emission issues. A generation mechanism for electromagnetic interference (EMI) is presented to investigate the EMI problem caused by zero-crossing issue, and a noise spectrum due to this issue is predicted by a theoretical analysis based on the Fourier coefficient of an approximate spike current waveform. Furthermore, a noise reduction method is proposed and then improved to reduce the spike current. Experimental measurements are implemented on a GaN-based totem-pole bridgeless PFC converter, and the spike current can be effectively suppressed through the proposed method. Furthermore, the noise spectrums measured without and with the reduced zero-crossing spike current are compared. Experimental results validate the analysis of the noise spectrum caused by the zero-crossing spike current issue.
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EMI Prediction and Reduction of Zero-Crossing Noise in Totem-Pole Bridgeless PFC Converters
Baihua Zhang,Qiang Lin,Jun Imaoka,Masahito Shoyama,Satoshi Tomioka,Eiji Takegami 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
In this study, a zero-crossing spike current issue in a totem-pole bridgeless power factor correction (PFC) converter iscomprehensively investigated for the first time. Spike current occurs when input voltage crosses zero, becomes a noise source,and causes severe common mode emission issues. A generation mechanism for electromagnetic interference (EMI) is presentedto investigate the EMI problem caused by zero-crossing issue, and a noise spectrum due to this issue is predicted by a theoreticalanalysis based on the Fourier coefficient of an approximate spike current waveform. Furthermore, a noise reduction method isproposed and then improved to reduce the spike current. Experimental measurements are implemented on a GaN-basedtotem-pole bridgeless PFC converter, and the spike current can be effectively suppressed through the proposed method. Furthermore, the noise spectrums measured without and with the reduced zero-crossing spike current are compared. Experimental results validate the analysis of the noise spectrum caused by the zero-crossing spike current issue.
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