A5000157558- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Advanced Battery Technologies Research
- Innovative Energy Harvesting Technologies
- Advanced DC-DC Converters
- Analog and Mixed-Signal Circuit Design
- Photovoltaic System Optimization Techniques
- Antenna Design and Analysis
- Advancements in Semiconductor Devices and Circuit Design
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Sensor and Energy Harvesting Materials
- solar cell performance optimization
- Nanomaterials and Printing Technologies
- Wireless Body Area Networks
- Gas Sensing Nanomaterials and Sensors
- Advanced Power Amplifier Design
- Neuroscience and Neural Engineering
Samsung (South Korea)
2025
Ulsan National Institute of Science and Technology
2016-2023
Incheon National University
2018
Herein, we report the fabrication of a highly stretchable, transparent gas sensor based on silver nanowire-graphene hybrid nanostructures. Due to its superb mechanical and optical characteristics, fabricated demonstrates outstanding stable performances even under extreme deformation (stable until 20% strain). The integration Bluetooth system or an inductive antenna enables wireless operation sensor. In addition, robustness materials allows device be transferred onto various nonplanar...
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...
In this paper, a 13.56 MHz wireless power transfer system with transmitter (TX) and receiver (RX) chips is presented. Both TX RX were designed fully integrated reconfigurable single stage to realize adaptive delivery output voltage regulation. The operation of synchronized the reconfiguration frequency which could vary coupling or loading condition locked by proposed phase-locked-loop-based on-time duty controller mitigate electromagnetic interference. addition, calibrations for circuit...
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 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...
This brief presents a class-D power amplifier (PA) with an adaptive zero-voltage switching (A-ZVS) technique for 6.78 MHz resonant wireless transfer (R-WPT) system. In R-WPT operation, the loading impedance of PA can be varied by process tolerance LC components or WPT environments, such as topology, coupling coefficient, and condition receiver. particular, commonly used series-parallel topology suffers from point deviation primary tank, resulting in hard PA. Consequently, efficiency...
In wireless power transfer technology, control technique is required to realise constant current (CC) and voltage (CV) modes for battery charging. CC CV are needed effectively charge lithium (Li)-ion batteries ensure long life span maximum capacity utilisation. The use of additional charging circuitry reduces efficiency, increases volume, circuit complexity. frequency modulation method a that can without an circuit, but high-resolution controller the by modulation. This study proposes system...
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...
In this paper, a method is proposed to improve the wireless link of an in-body body-area network(WBAN) antenna with off-body signal-reading system. A small WBAN embeddable in human body designed. wide-band size-reduced reader cope frequency shift resulting from short distance between agent and antennas, attenuation by tissue. The transmission shown over 50 dB.
This study reports a miniaturised discontinuous conduction mode (DCM) variable on‐time (VOT) buck converter providing an output of 1.8 V in the input range 3–12 to support applications with large wireless coupling. Conventionally, additional capacitor has been used as bootstrap drive high‐side switch converters, which prevents minimisation. In this study, standalone momentary power consumption level shifter is proposed remove and increase conversion efficiency (PCE) converter. A Zener diode...