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RISS 인기검색어
- 검색키워드
- 저자 : Changbyung Park (검색결과 8 건)
- 무료
- 기관 내 무료
- 유료
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A Pen-Pressure-Sensitive Capacitive Touch System Using Electrically Coupled Resonance Pen
Changbyung Park,Sungsoo Park,Ki-Duk Kim,Sanghui Park,Juwan Park,Byunghoon Kang,Yunhee Huh,Gyu-Hyeong Cho IEEE 2016 IEEE journal of solid-state circuits Vol.51 No.1
<P>A touch system sensing pen-pressure of the proposed electrically coupled resonance (ECR) pen is implemented, which can replace costly digitizer system containing electro magnetic resonance (EMR) and capacitive touch system. The proposed system detects the location of the ECR pen and finger using proposed position sensor, and senses pen-pressure of ECR pen using proposed pen-pressure sensor. For the position sensor, to detect even small variation of the mutual capacitance on touch screen panel (TSP) of the pen, a simultaneous driving scheme is proposed with modified Hadamard matrix, resulting in highly increased dynamic range and SNR. In the proposed pen-pressure sensor, the resonant frequency of the ECR pen is measured by a frequency to voltage converter based sensor. The measured SNR for the pen position is 49 dB with 1 mm phi metal pillar, and 6.5-bit resolution is achieved for pen-pressure sensor in 6 sigma criteria.</P>
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Changbyung Park,Sungwoo Lee,Gyu-Hyeong Cho,Su-Yong Choi,Rim, Chun T. IEEE 2014 IEEE transactions on industry applications Vol.50 No.1
<P>The inductive power transfer system for mobile robots, which has the single wire layer of easily fabricated power floor structure and the evenly displaced multiple pickup structure for receiving uniform power, is proposed. Due to its simple structure, a wide-area power floor of 3.52 m<SUP>2</SUP> (1.6 m ×2.2 m) could be fabricated as a prototype. Three pickups with evenly displaced angle and space are adopted, considering the limited bottom area of the free-moving mobile robot. The size and position of each pickup are appropriately selected for the given subwinding size of the power floor and magnetic pole arrangement. Experiments for the prototype show that the proposed multiple pickup structure lowers the spatial output power variation and that enough output power of 10 W can be obtained for the mobile robots.</P>
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Changbyung Park,Sungwoo Lee,Seog Yong Jeong,Gyu-Hyeong Cho,Rim, Chun T. Institute of Electrical and Electronics Engineers 2015 IEEE transactions on power electronics Vol. No.
<P>A narrow-width power-invariant inductive power transfer system (IPTS) along the driving direction is newly proposed in this paper. The conventional I-type power supply rail for on-line electric vehicles (OLEVs) has a very narrow power supply rail with 10-cm width and exposes pedestrians to a very low electromagnetic field due to its alternatively arranged magnetic poles along the driving direction of electric vehicles; however, it has a major drawback: Sinusoidal variation of the induced pick-up voltage depending on pick-up positions on the power supply rail along driving direction. To overcome this disadvantage, a dq-power supply rail fed by two high-frequency ac currents of the d-phase and q-phase is introduced in this paper. The d -phase and q-phase magnetic poles are alternatively arranged in a line; hence, the induced voltage of a pickup becomes spatially uniform. The power invariant characteristic of the proposed IPTS for OLEV has been verified by analysis, simulations, and experiments. A practical winding method is suggested as well.</P>
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Innovative 5-m-Off-Distance Inductive Power Transfer Systems With Optimally Shaped Dipole Coils
Changbyung Park,Sungwoo Lee,Gyu-Hyeong Cho,Rim, Chun T. Institute of Electrical and Electronics Engineers 2015 IEEE transactions on power electronics Vol. No.
<P>5-m-off-distance inductive power transfer systems that have optimally shaped cores in the primary and secondary coils are proposed. Instead of conventional-loop-type coils for magnetic resonance scheme, magnetic dipole type coils with cores are used for drastic reduction in deployment space and quite long wireless power transfer. An optimized stepped core structure is also proposed, where a strong magnetic field section is so thick that magnetic field density may be even. Thus, the proposed optimized stepped core has only 41% core loss compared with an unoptimized even core but delivers 2.1 times more wireless power for a given amount of core. Experimentally obtained maximum output powers and primary-coil-to-load-power efficiencies for 3, 4, and 5 m at 20 kHz were 1403, 471, 209 W, and 29%, 16%, 8%, respectively.</P>
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Huh, Yeunhee,Hong, Sung-Wan,Park, Sang-Hui,Shin, Changsik,Bang, Jun-Suk,Park, Changbyung,Park, Sungsoo,Cho, Gyu-Hyeong IEEE 2018 IEEE journal of solid-state circuits Vol.53 No.4
<P>A high-signal-to-noise ratio (SNR) inductor-free 3-D hover sensor is presented. This paper solved the low-signal component issue, which is the biggest problem in 3-D hover sensing. For this purpose, we propose a power- and cost-effective high-voltage driving technique in the self-capacitance sensing scheme (SCSS) and lateral resolution optimization of a touch panel. In addition, the huge panel offsets in the SCSS from both vertical panel capacitance (C<SUB>SV</SUB>) and horizontal panel capacitance (C<SUB>SH</SUB>) can effectively be eliminated by exploiting the panel’s natural characteristics, without using other costly resources. Therefore, in the proposed design, the total calibration block is minimized only for parasitic capacitance mismatches. Last, by adopting new driving scheme, two-phase simultaneous sensing is enabled to increase the SNR further. The proposed hover sensing system achieved a 39-dB SNR at a 1-cm hover point under a 240-Hz scan rate condition in noise experiments, while consuming 183 <TEX>$\mu \text{W}$</TEX>/electrode and 0.73 mm<SUP>2</SUP>/sensor, which are the lowest power per electrode performance and the smallest die-area per sensor performance, respectively, in comparison to the state-of-the-art 3-D hover systems.</P>
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Accurate Dead-Time Control for Synchronous Buck Converter With Fast Error Sensing Circuits
Sungwoo Lee,Seungchul Jung,Changbyung Park,Chun-Taek Rim,Gyu-Hyeong Cho IEEE 2013 IEEE transactions on circuits and systems. a publi Vol.60 No.11
<P>Dead-time controls for synchronous buck converter are challenging due to the difficulties in accurate sensing and processing the on/off dead-time errors. For the control of dead-times, an integral feedback control using switched capacitors and a fast timing sensing circuit composed of MOSFET differential amplifiers and switched current sources are proposed. Experiments for a 3.3 V input, 1.5 V-0.3 A output converter demonstrated 1.3 ~ 4.6% efficiency improvement over a wide load current range.</P>
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