http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Song, Chiuk,Kim, Hongseok,Kim, Youngwoo,Kim, Donghyun,Jeong, Seungtaek,Cho, Yeonje,Lee, Seongsoo,Ahn, Seungyoung,Kim, Joungho Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.9
<P>Wireless power transfer (WPT) technology is a promising way for convenient and safe battery charging without any electrical contact, which may cause an unwanted electric spark or deliver dangerous electric current to the users. When transferring power from the source to the battery, strong electromagnetic fields (EMFs) are generated. Moreover, the inverter output contains a wide range of harmonics. Therefore, it is important to reduce the EMFs and electromagnetic interference (EMI) in a WPT system. For the first time, in this paper, we propose a new tightly coupled three-phase resonant magnetic field (TC-TPRMF) charger for a drone operating at 60 kHz, which can completely eliminate the third harmonic and its integer multiples in the output voltage. Furthermore, to reduce the selective EMI, the conduction angle control is proposed for the WPT charging system. Through a series of measurements, we verified that the proposed TC-TPRMF with the conduction angle control can reduce the seventh and 11th harmonics of the Tx current by 6.08 and 11.84 dBμA, respectively. The coil-to-coil power transfer efficiency and total system power transfer efficiency are maintained at 91% and 72%, respectively.</P>
Chiuk Song(송치억),Hyck Su Kweon(권혁수),Un ho Lee(이운호),Hyeonsung Hong(홍현성),Chung Hyun Lee(이충현),Jonghyun Park(박종현) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
When the 48V dc/dc converter supply power to 12V electronics and store regenerated energy back into the battery, the electromagnetic interference (EMI) noise is generated. Moreover, the dc-dc converter with switching operation contains a wide range of harmonics. Since conducted and radiated emissions from automotive system can be constrained below specified limits, it is important to reduce EMI noise in an automotive system with EMI filter. In this study, we firstly simulated conducted noise from the automotive 48V dc/dc converter with EMI filter PCB. The ferrite cores in EMI filter with are modeled with frequency dependent complex permeability. The conducted emission noise of the dc-dc converter with and without modeling of frequency dependent material has been analyzed and simulated by using a circuit simulation. The simulation and measurement setup for conducted emissions are directed by CISPR 25 standard.
Song, Chiuk,Kim, Hongseok,Jung, Daniel H.,Kim, Jonghoon J.,Kong, Sunkyu,Kim, Jiseong,Ahn, Seungyoung,Kim, Jonghoon,Kim, Joungho [Institute of Electrical and Electronics Engineers 2016 IEEE transactions on electromagnetic compatibility Vol.58 No.4
<P>Wireless power transfer ( WPT) technology is an electrically safe and convenient method of charging batteries. WPT technology allows elimination of exposed contacts, which can cause direct electrocution of human. In spite of the great advantages, the WPT system inevitably generates strong electromagnetic fields ( EMFs), causing interference on the nearby electrical devices as well as harmful influence on human health. Therefore, it is important to satisfy EMF guidelines and reduce leakage magnetic field harmonics in WPT system. For the first time, in this paper, we propose a new tightly coupled handheld resonant magnetic field ( HH-RMF) charger operating at 20 kHz with low EMF and high efficiency. Using a guided magnetic flux in resonance structure, 64.5 mG of EMF is reduced compared to the conventional inductive charger at a distance of 200 mm from edge of the core. In addition to the electromagnetic interference ( EMI) reduction, the isolation inductor scheme is proposed as an EMI reduction method. Through a series of measurements, we experimentally verified that the proposed HH-RMF charger complies with the regulations published by the International Commission on Non-Ionizing Radiation Protection in 1998. The proposed HH-RMF charger with the isolation inductor scheme successfully reduces the third harmonic of the Tx and Rx currents by 23.4 and 11.8 dB mu A, respectively. Furthermore, the third and fifth magnetic field harmonics reduce by 1.38 and 0.67 mG, respectively. The coil-to-coil power transfer efficiency and total system power transfer efficiency of the proposed structure are maintained at over 98% and 84%, respectively.</P>
Smartwatch Strap Wireless Power Transfer System With Flexible PCB Coil and Shielding Material
Jeong, Seungtaek,Kim, Dong-Hyun,Song, Jinwook,Kim, Hongseok,Lee, Seongsoo,Song, Chiuk,Lee, Jaehak,Song, Junyeop,Kim, Joungho Institute of Electrical and Electronics Engineers 2019 IEEE transactions on industrial electronics Vol. No.
<P>In this paper, we designed and demonstrated a smartwatch strap wireless charging system for the first time. First, we designed a flexible printed circuit board (PCB) coil, shielding material, and receiver (Rx) circuit in a watchstrap. In the design process, we proposed a model for the flexible PCB coil with a bending radius of 40 mm and shielding materials. We used a flexible PCB coil that has 215 <I>μ</I>m thickness with dimensions of 54.5 × 16 mm. In addition, ferrite core and sheet are applied on the transmitter (Tx) and Rx coils. We verified the proposed model through a three-dimensional (3-D) electromagnetic (EM) simulation and measurement in the frequency and time domains. The proposed flexible PCB coil inductance modeling results showed 7.5% and 3.4% errors when compared to the 3-D EM simulation and measurement results, respectively. Furthermore, we demonstrated the smartwatch strap wireless charging system using an LG Watch Urbane. A resonance frequency of 100 kHz with the series–series tuning topology is used in accordance with the Qi specifications. Finally, we achieved 30% dc–dc power transfer efficiency and exposed magnetic field of 270 mG, 1 cm away from the system through measurements.</P>
EMC 노이즈 저감을 위한 PCB 레벨 EMC 룰 검증 및 최적화
권혁수(Hyck Su Kweon),송치억(Chiuk Song),이운호(Un ho Lee),홍현성(Hyeonsung Hong),이충현(Chung Hyun Lee),박종현(Jonghyun Park) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
For printed circuit board (PCB) design using computer aided design (CAD), a design Rule for reduction of electromagnetic interference is developed. In this paper, EMC rules can be explained, and EMC and power/signal integrity are described. EMC compliance costs are always reduced by designing-in EMC rather than only considering it after functionality has been achieved. So using these design rules from the start of a new design is a powerful competitive tool. Many of these EMC design rules are also important for power/signal integrity, so implementing them can save a great deal of time and cost during product development by achieving the desired functionality sooner. The EMC rules of component choice, component placement, trace wiring and grounding is presented.
Cho, Yeonje,Lee, Seongsoo,Kim, Dong-Hyun,Kim, Hongseok,Song, Chiuk,Kong, Sunkyu,Park, Junyong,Seo, Chulhun,Kim, Joungho [Institute of Electrical and Electronics Engineers 2018 IEEE transactions on electromagnetic compatibility Vol.60 No.4
<P>Current wireless power transfer (WPT) systems have limited charging distance and high induced electromagnetic field (EMF) leakage. Thus, we first proposed a thin printed circuit board (PCB) type hybrid metamaterial slab (HMS) combining two kinds of metamaterial cell structures. The metamaterial cells in the center area of the HMS have zero relative permeability and straighten the magnetic field direction. The metamaterial cells located at the edges of the HMS have negative relative permeability and change the outgoing magnetic fields to opposite direction by magnetic boundary condition. Therefore, the magnetic field can be more confined between transmitter and receiver coils, enhancing the power transfer efficiency, while decreasing the EMF leakage in a WPT system. In this paper, we demonstrated that increased power transfer efficiency from 34.5% to 41.7% and reduced EMF leakage from -19.21 to -26.03 dBm in 6.78-MHz WPT system. Furthermore, we proposed new analysis method for relative permeability measurement of the metamaterial using a novel cubic structure with perfect electrical conductor and perfect magnetic conductor boundary.</P>
Sunkyu Kong,Bumhee Bae,Jung, Daniel H.,Kim, Jonghoon J.,Sukjin Kim,Chiuk Song,Jonghoon Kim,Joungho Kim Professional Technical Group on Microwace Theory a 2015 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>Wireless power transfer (WPT) technology has recently emerged as an innovative and promising technology, and its electromagnetic compatibility (EMC) has become a significant issue. In this study, we investigated the electromagnetic (EM) radiated emission and interference generated by WPT systems using resonant magnetic field coupling, especially in applications with multi-coil configurations. The change in coil resonance associated with multi-coil configurations was analyzed via the impedance profile. We measured the EM radiated emission and analyzed the results with respect to the coil resonance. An analog-to-digital converter chip was designed and fabricated to analyze the effect of electromagnetic interference (EMI). Based on measurement and simulation results, we verified that the EM radiated emission and interference increase at the series or parallel resonance peaks, depending on the source type. In addition, we verified that EMI can be reduced by using ferrite sheet shielding.</P>
Lee, Seongsoo,Park, Junyong,Cho, Kyungjun,Lee, Hyunsuk,Seo, Chulhun,Ahn, Seungyoung,Kim, Joungho,Kim, Dong-Hyun,Cho, Yeonje,Kim, Hongseok,Song, Chiuk,Jeong, Seungtaek,Song, Jinwook,Park, Gyeyoung,Hong Institute of Electrical and Electronics Engineers 2019 IEEE transactions on industrial electronics Vol.66 No.6
<P>In this paper, we first proposed a novel hybrid loop array (HLA) for low leakage electromagnetic field (EMF) level and high efficiency in a wireless high power transfer system. The proposed HLA effectively enhances the system efficiency and shields leakage EMF in a wireless power transfer (WPT) system using kHz range resonant frequency. The key originality of the proposed HLA is the combination of two types of loop coil; shielding loop coil (SLC) and amplifying loop coil (ALC). SLCs reduce leakage EMF, and ALCs significantly enhance the magnetic field from a Tx coil. The simulation and experiment results show that the proposed solution successfully overcomes the limitations of the existing solutions. Analytical modeling and design procedure are introduced and discussed. In addition, the experimental verification of the simulation result is included. We first designed and modeled an HLA considering the coupling effect of neighboring loop coils to evaluate its efficiency and leakage EMF. With the proposed HLA, we demonstrated a 9.36% improvement in the efficiency and 3 dBm reduction in the leakage EMF near the WPT system.</P>