A5001040595- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Engineering Applied Research
- Plasma Diagnostics and Applications
- Innovative Energy Harvesting Technologies
- Advanced Battery Technologies Research
- Neuroscience and Neural Engineering
- Analog and Mixed-Signal Circuit Design
- Advanced DC-DC Converters
- Advanced MEMS and NEMS Technologies
- Thin-Film Transistor Technologies
- Manufacturing Process and Optimization
- Photovoltaic System Optimization Techniques
- Low-power high-performance VLSI design
- solar cell performance optimization
- Integrated Circuits and Semiconductor Failure Analysis
- Mechanical Engineering and Vibrations Research
- Simulation and Modeling Applications
- Acoustic Wave Resonator Technologies
- TiO2 Photocatalysis and Solar Cells
- Garlic and Onion Studies
- Optimal Experimental Design Methods
- Vehicle Dynamics and Control Systems
- Korean Peninsula Historical and Political Studies
- Radiative Heat Transfer Studies
Ulsan National Institute of Science and Technology
2016-2023
Pusan National University
2010-2018
Samsung (South Korea)
2012-2014
Corning (South Korea)
2014
In this paper, a fully integrated active rectifier with triple feedback loops is proposed to enhance power conversion efficiency (PCE) over wide loading range by calibrating both the gate transition timing and switch size. The on- off-transitions of switches are calibrated using hybrid delay-based control circuit (HDGCC) loops. Conventional rectifiers that only focused on NMOS fixed size exhibit low PCE when condition deviates from predetermined range. Thus, an automatic selector based third...
We investigate two types of internal light-extraction layer structures for organic light-emitting diodes (OLEDs) that consist silica nanoparticles (NPs) embedded in high-refractive-index TiO₂ matrices. The composite NPs and matrices was coated on the glass substrate fabricated with without a SiO₂ planarization layer. An increase optical out-coupling efficiency by factor 2.0 obtained at high luminance 3,000 cd/m² from OLEDs containing between substrates Zn-doped In₂O₃ (IZO) electrodes after...
This paper presents a mutual capacitive touch screen panel (TSP) readout IC (ROIC) with differential continuousmode parallel operation architecture (DCPA). The proposed achieves high product of signal-to-noise ratio (SNR) and frame rate, which is requirement ROIC for large-sized TSP. DCPA accomplished by using the sensing method in continuousmode. implemented continuous-type transmitter signaling differential-architecture receiver. A charge amplifier removes common-mode noise component,...
A photovoltaic (PV) energy harvesting system with 2-Dimensional Fast Maximum Power Point Tracking (2-D FMPPT), based on the hill climbing (HC) MPPT technique is proposed. The 3-step modes for are employed to obtain KVOC that independent of environmental effects such as irradiance and radiated temperature. consists a dynamic peak transducer power sensor (DPTPS), Coarse (1st) FMPPT mode, Ton Increment/Decrement Mode, Fine (2nd) logics, controller. can handle voltage range 0.5 V 2.4 1.4 mW 119...
This paper presents a fingerprint mutual capacitive touchscreen panel (TSP) readout IC, which uses differential coded multiple signaling (DCMS) method. A IC with high SNR and fast frame rate is required for recognition. However, achieving challenging owing to the limited capacitance difference originating from small depth variations between ridges valleys of fingerprint. In addition, scanning entire TSP electrodes time-consuming. fully receiver DCMS proposed detect low in TSP. The internal...
This paper presents a wide input range active rectifier using bipolar-CMOS-DMOS (BCD) process with high voltage conversion ratio (VCR) and power efficiency (PCE). The proposed ensures safe robust operation under large variations, which can be caused by changes in the magnetic coupling or loading conditions. It supports an 3-12 V adaptive delay-compensated of switches. An signal clamper voltage-time hybrid gate control circuit two compensation loops was for optimal transition low-side NMOS...
An instantaneous power consuming level shifter is presented in this brief to increase the dc converter efficiency. The used a high-side switch driver remove external capacitor which bootstrap technique. consumes only during transition period. A delay cell turn off reduce consumption output voltage detector added even before time. asynchronous discontinuous conduction mode buck designed verify performance of shifter. Simulation results show that proposed decreased by 66%, while efficiency...
Fully integrated on-time-based mode control is utilized to achieve an efficient of a PWM/PFM buck converter for implantable medical devices. The proposed method predicts load current from the on-time power switches and does not require additional sensor. Additional passive components estimation are required in this approach. Moreover, consumes less requires smaller area compared with other circuits used prediction. dual fabricated using TSMC <inline-formula...
We propose improved SNR through on-chip Differentially Modulated Signaling with High Voltage (HV) based on Time-Interleaved Sensing Method (TISM) in fingerprint sensing. Tx driver transmits the 0 to 20V-pulse output proposed signaling into Fingerprint Sensor (FPS), order increase signal noise ratio (SNR). When capacitance difference of valley-ridge is 0.4fF, differentially modulated TISM (DM-TISM) achieved greater (3.3dB) than that conventional performance sensor readout IC architecture,...
This paper presents a photovoltaic(PV) energy-harvesting system with fast maximum power point tracking (FMPPT) circuit that utilizes 4-bit successive approximation register analog to digital converter (SAR ADC) suitable for solar cells. Solar Panel's output depends on switch duty ratio of inductive-boost DC/DC converter. Usability 4-bit/cycle SAR ADC adjust is proved through the measurement, using conventional Pulse Frequency Modulation (PFM) boost achieves short time 4-cycle in order reach...
This paper presents a triple-band radio frequency (RF) energy harvesting system with 99.99% peak tracking efficiency and the triple band rectifier achieves 4.6% improvement in power conversion (PCE). The proposed has range of −11 to 7 dBm three bands targeted on 900, 1900, 2400 MHz. In this paper, voltage characteristics at each are extracted as raw data by measurement. DC-DC boost converter is applied achieve maximum point (MPPT), which exploits hill-climbing MPPT method. method implemented...
Wireless power transfer (WPT) technology applied to implantable medical devices (IMDs) significantly reduces the need for battery replacement surgery health conditions. This paper presents an on-/off-time sensing-based load-adaptive mode control of triple buck converter devices; can adjust low consumption and achieve high conversion efficiency (PCE) under a small active area. The three modes in proposed system are pulse width modulation (PWM), frequency (PFM), ultra-low (ULP) modes. on-time...
This brief presents a readout IC with 20 V high-voltage (HV) transmitter (Tx) and On-Chip Differentially Modulated Time-Interleaved Sensing Method (DM-TISM) in BCD process for mutual-capacitive Transparent Fingerprint Sensor (TFPS) order to achieve high SNR, AC & DC offset reduction, noise immunity, compensate the signal loss under thick cover glass. A proposed onchip DM-TISM is composed of 42 identical HV Tx channels, 32 Rx diamond-patterned TFPS. The performance results including those...
외부전극 형광램프(EEFL)에서 빛의 방출 전파 신호의 관측법에 의하여 플라즈마의 전자 온도와 밀도를 진단하는 새로운 방법을 소개한다. 직경 4.0 mm이고 램프 길이 860 mm인 37인치 LCD-TV용 형광램프에 대하여, 전압 인가 방식에 따른 두 가지의 구동법에 의한 발광 형태와 특성을 조사한다. 양단에 고전압을 인가하는 구동 방식에서, 빛은 고전압이 인가된 양 끝에서 중앙으로 방출이 전파되며, 전체에 대하여 휘도가 균일하다. 한쪽에 인가하고 다른 한쪽은 접지한 구동에서, 방출은 전극에서 접지된 전극 방향으로 고전압 쪽의 높고 접지 낮아 불균일하다. 이러한 신호로부터 전자의 표류 속도를 계산하여, 얻는다. 형광램프의 사용 휘도의 영역인 <TEX>$10,000{\sim}15,000cd/m^2$</TEX>에 온도 <TEX>$(kT_e)$</TEX>는 <TEX>$1.3{\sim}2.7eV$</TEX>, 밀도 <TEX>$(n_e)$</TEX>는...
5MW급 풍력발전용 기어박스의 효율적인 구조해석과 근사모델을 생성하여 경량화를 위한 형상 최적설계를 수행하였다. 구조는 기어 트레인, 축, 베어링, 하우징과 같이 복잡한 구성요소로 이루어져 있어 구조해석에 많은 요소 수를 요구하고 있다. 본 연구에서는 헬리컬 기어의 치강성 계수를 고려한 효과적인 구조해석 모델을 생성하였다. 사용한 유성 기어열은 상대적으로 적은 수와 해석시간으로도 전체 기어박스 시스템의 최적화를 가능케 한다. 치강성을 이용한 단순화된 해석모델과 적용하여 하우징 무게에 영향이 큰 부위의 두께를 설계변수로 설정하여 케이스 최적설계안을 도출하였으며, 위해 사용된 근사모델의 신뢰성과 최적 형상의 수치해석을 통해 타당성을 검증하였다. The thickness optimization of the gearbox housing for 5MW wind turbine is carried out with help efficient structure analysis model...
TiO2 thin films were grown on glasses using a pulsed laser deposition (PLD) system. In order to fully clarify the correlation between their properties and working pressure of oxygen at which they are grown, wide range pressures from 10 75 mTorr was investigated. The optical gap gradually increased 3.3 3.41 eV with increasing up 25 but became notably large 50 continued increase significantly further increase. X-ray diffraction (XRD) results showed that grew preferentially along (101)...
This paper presents a fingerprint mutual capacitive touch-screen panel (TSP) readout IC (ROIC) with differential signaling method for fast recognition. A high SNR and frame rate are required in the However, capacitance difference by ridge valley of is very small, so that signal-to-noise ratio low. In addition, it takes long time to scan whole TSP multiple electrodes. fully architecture proposed detect low TSP. The internal noise generated minimized 2 <sup...