ECCL - Members

ABOUT ME

“Think about how to change the way of teaching things to put more emphasis on how these things could be used to do real design.” R.D. Middlebrook May 1929-April 2010.

CONTACT

sjchoi@ulsan.ac.kr
http://eccl.ulsan.ac.kr/

RESEARCHS

DC/DC Power Conversions
LED and Display Drivers Wireless Power Transfer
Power Conditioning System
Energy Storage System
Battery Management System

SUNG-JIN, CHOI (최성진)

BIOGRAPHY

Born in 1973 / BS, MS, Ph.D., Seoul National University KIPE, IEEE, KIEE member
2006 - 2008

Research Engineer in Palabs Co., Ltd., Seoul, Korea
2008 - 2011

Principal Research Engineer in Samsung Electronics, Co., Ltd., Suwon, Korea
2011 - 2016

Assistant Professor in University of Ulsan
2016

Associate Professor, Department of Electrical, Electronic and Computer Engineering, University of Ulsan
Present

Editor of the Journal of Power Electronics (JPE)
Present

Professor, Department of Electrical, Electronic and Computer Engineering, University of Ulsan

PUBLICATIONS

2024

Chanh-Tin Truong, and Sung-Jin Choi. "Improved ZVS Criterion for Series Resonant Converters." IEEE Access (2024).
2024

Phuong-Ha La, Nguyen-Anh Nguyen, and Sung-Jin Choi. "Average Model of Switched-Energy-Tank Battery Equalizer for Accelerated Performance Assessment." Energies 17.3 (2024): 631.
2024

Tofopefun Nifise Olayiwola, Seung-Ho Hyun, and Sung-Jin Choi. "Photovoltaic Modeling: A Comprehensive Analysis of the I–V Characteristic Curve." Sustainability 16.1 (2024): 432.
2024

Duong Tan-Quoc, and Sung-Jin Choi. "Moving Discretized Control Set Model Predictive Control with Dominant Parameter Identification Strategy for Dual Active Bridge Converters." Mathematics 12.4 (2024): 563.
2024

Duong Tan-Quoc, Hoai-An Trinh, Kyoung-Kwan Ahn, and Sung-Jin Choi. "Adaptive Extended State Observer for the Dual Active Bridge Converters." Sensors 24, no. 8 (2024): 2397.
2024

Nguyen Nguyen-Anh, Phuong-Ha La, and Sung-Jin Choi. "Novel High-Speed State-of-Charge Alignment Algorithm for EV Battery Maintenance." IEEE Transactions on Industrial Electronics (2024).
2024

Nguyen Nguyen-Anh, Phuong-Ha La, and Sung-Jin Choi. "A Novel Balancing Algorithm for Lithium Battery Strings Using Bidirectional Charge Circulation." 2024 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2024.
2024

Pham Ngoc-Thao, Jong-Hoon Kim, and Sung-Jin Choi. "Novel Battery Model Employing Variable Capacitor for Effective Description of SOC Behavior." 2024 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2024.
2024

Nguyen-Anh Nguyen, and Sung-Jin Choi. "Fast and Accurate Pre-conditioning Method for Li-on Battery Cell-balancing Tests." 전력전자학회 학술대회 논문집 (2024): 971-972.
2023

Thusitha Randima and Sung-Jin Choi, "Small-Signal Stability Analysis With Approximated PV Model for Solar Array Simulator," in IEEE Transactions on Power Electronics, vol. 38, no. 1, pp. 1190-1203, Jan. 2023, doi: 10.1109/TPEL.2022.3191672.
2023

KR Patent - 10-2515928 - DAB converter output voltage control method and system.
2023

KR Patent - 10-2539821 - SYSTEM AND METHOD FOR SOC ALIGNMENT OF SECOND-LIFE BATTERY
2023

Duong, Tan-Quoc, and Sung-Jin Choi. "Sensor-Reduction Control for SPS-Modulated DAB Converter using Ultra-Local Model." 2023 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2023.
2023

Tofopefun Nifise Olayiwola, and Sung-Jin Choi. "Superellipse model: An accurate and easy-to-fit empirical model for photovoltaic panels." Solar Energy 262 (2023): 111749.
2023

Nguyen-Anh Nguyen, Phuong-Ha La, and Sung-Jin Choi. "Pre-heating Method Employing Pulse Current Excitation for Effective Charging of LiB in Low-Temperature Environment." 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023-ECCE Asia). IEEE, 2023.
2023

Tofopefun Nifise Olayiwola, and Sung-Jin Choi. "Effective Approximation of the Photovoltaic Characteristic Curves using a Double-shaped Superellipse." 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023-ECCE Asia). IEEE, 2023.
2023

Chanh-Tin Truong, and Sung-Jin Choi. "Analysis of Capacitor Parasitic Effects on Output Voltage Ripple and Load Transient of DAB Converters." 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023-ECCE Asia). IEEE, 2023.
2023

Tan-Quoc Duong, and Sung-Jin Choi. "Deadbeat Control with Current Stress Optimization for Extended Phase-Shift Modulated DAB Converter." 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023-ECCE Asia). IEEE, 2023.
2023

Tae-Yeong Im, Nguyen-Anh Nguyen, Sung-Jin Choi. "Multiobjective design optimization of transformers for battery cell balancing converters considering bidirectional power flow." Journal of Power Electronics (2023): 1-10.
2023

Tae-Yeong Im, "A Control Method to Deal with Wide Input Range and Receiver Misalignment for Capacitive Power Transfer System," Master Thesis, University of Ulsan, 2023
2023

Jeong-Soo Park, Chanh-Tin Truong, and Sung-Jin Choi. "2 병렬 DAB 컨버터의 최적 인터리빙 위상각 분석." 전력전자학회 학술대회 논문집 (2023): 556-557.
2023

Jeong-Soo Park, Chanh-Tin Truong, Tae-Yeong Im, and Sung-Jin Choi. "DAB 컨버터의 경부하 효율 개선을 위한 새로운 간헐 스위칭 기법 연구." 전력전자학회 학술대회 논문집 (2023): 160-161.
2023

Seung-Ha Ryu, Chanh-Tin Truong, and Sung-Jin Choi. "Effective Scheme for Inductive Wireless Power Coil Design Using Scan-and-Zoom Optimization." Applied Sciences 13.16 (2023): 9299.
2023

Tofopefun Nifise Olayiwola, and Sung-Jin Choi. "Long-term Aging Pattern Characterization for Photovoltaic Panels using the Superellipse Model." 전력전자학회 학술대회 논문집 (2023): 112-113.
2023

Ngoc-Thao Pham, and Sung-Jin Choi. "Estimating Passive Balancing Time for Lithium Iron Phosphate (LiFePO4) Battery Using Nonlinear Capacitor-Based Modeling." 전력전자학회 학술대회 논문집 (2023): 110-111.
2023

Tan-Quoc Duong, Tofopefun Nifise Olayiwola, Tae-Yeong Im, and Sung-Jin Choi. "Deadbeat Control for Single-Input Dual-Output Dual Active Bridge Converter." 2023 26th International Conference on Mechatronics Technology (ICMT). IEEE, 2023.
2023

Hoai-An Trinh, Sung-Jin Choi, and Kyoung Kwan Ahn et al. "Robust Adaptive Control Strategy for a Bidirectional DC-DC Converter Based on Extremum Seeking and Sliding Mode Control." Sensors 23.1 (2023): 457.
2023

Nhat Quang Doan, Sung-Jin Choi and Sungoh Kwon, et al. "Deep Reinforcement Learning-Based Battery Management Algorithm for Retired Electric Vehicle Batteries with a Heterogeneous State of Health in BESSs." Energies 17.1 (2023): 79.
2022

Thusitha Randima, "Modeling, Stability, and Control for Solar Array Hardware Simulator," Ph.D. Thesis, University of Ulsan, 2022
2022

Ngoc–Thao Pham, Phuong–Ha La, and Sung–Jin Choi. "Online Model-Parameter Identification for Battery Cells Utilizing Switched-Capacitor Equalizers." 2022 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2022.
2022

Phuong-Ha La, and Sung-Jin Choi. "Direct Cell-to-Cell Equalizer for Series Battery String Using Switch-Matrix Single-Capacitor Equalizer and Optimal Pairing Algorithm." IEEE Transactions on Power Electronics 37.7 (2022): 8625-8639.
2022

Nguyen-Anh Nguyen, Phuong-Ha La, and Sung-Jin Choi. "Coordinated operation algorithm of pack-chargers and cell-equalizers for SOC adjustment in second-life batteries." Journal of Power Electronics 22.1 (2022): 105-115.
2022

Chanh-Tin Truong and Sung-Jin Choi. "A More Accurate ZVS Criterion for Resonant Converters." 2022 International Power Electronics Conference (IPEC-Himeji 2022-ECCE Asia). IEEE, 2022.
2022

Nguyen-Anh Nguyen, Phuong-Ha La, and Sung-Jin Choi. "High-speed Target SOC Alignment Algorithm for Second-life Battery Pack Maintenance." 2022 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE, 2022.
2022

Phuong-Ha La and Sung-Jin Choi. "Unified Average Model of Switched-Passive-Network Equalizer for Performance Assessment in Long-term Simulations." 2022 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE, 2022.
2022

Tan-Quoc Duong, and Sung-Jin Choi. "Deadbeat Control with Bivariate Online Parameter Identification for SPS-modulated DAB Converters." IEEE Access (2022).
2022

Tan-Quoc Duong, and Sung-Jin Choi. "Sensor-Reduction Control for Dual Active Bridge Converter Under Dual-Phase-Shift Modulation." IEEE Access 10 (2022): 63020-63033.
2022

Tan-Quoc Duong, and Sung-Jin Choi. "Deadbeat Control with Parameter Identification under Single Phase-Shift Modulation for Dual Active Bridge Converters." In 2022 IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 1222-1227. IEEE, 2022.
2022

Tan-Quoc Duong and Sung-Jin Choi, “Current-Sensorless Robust Control for Bidirectional DC-DC Dual Active Bridge Converter with Current Stress Optimization,” in 2022 The 13th Asian Control Conference (ASCC 2022), 2022, pp. 2087–2088.
2022

Tofopefun Nifise Olayiwola and Sung-Jin Choi, “Fast I-V curve approximation technique for photovoltaic panels using superellipse,” in KIPE Power Electronics Conference, pp. 408-409, 2022.
2022

Tae-Yeong Im, Thi Ngoc-Thao Pham, Nguyen-Anh Nguyen, Sung-Jin Choi, "Design Optimization of Planar Transformer for Bi-directional Forward Converter in Active Cell Balancing Applications," Power Electronics Conference, 80-82, July 2022
2022

Ngoc-Thao Pham, Phuong-Ha La and Sung-Jin Choi, 2022. Online cell-by-cell SOC/SOH estimation method for battery module employing extended Kalman filter algorithm with aging effect consideration. Journal of Power Electronics, pp.1-8.
2022

KR Patent 10-2464670- Apparatus and method for balancing charging of battery cells
2022

KR Patent 10-2463925- APPARATUS AND METHOD FOR EQUALIZING ENERGY OF PARALLEL-CONNECTED BATTERIES
2022

Tae-Yeong Im, Phuong-Ha La, Ki-Wook Lee and Sung-Jin Choi, "Multi-Objective Design Optimization for PCB Transformer in Bi-directional Converters." 전력전자학회 학술대회 논문집 (2022): 133-134.
2022

Seung-Ha Ryu, Chanh-Tin Truong, and Sung-Jin Choi. "Coil Design Scheme using Single-Turn FEM Simulation for Efficiency Optimization of Inductive Power Transfer System." 전력전자학회논문지 27.6 (2022): 471-480.
2021

Phuong-Ha La, and Sung-Jin Choi. "Integrated On-line EIS Measurement Scheme Utilizing Flying Capacitor Equalizer for Series Battery String." 2021 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2021.
2021

Phuong-Ha La, and Sung-Jin Choi. "Combined Equalizer Based on Switch-matrix and Bi-directional Converter for Parallel-Connected Battery Packs in Data-Center or Telecommunication." 2021 International Symposium on Electrical and Electronics Engineering (ISEE). IEEE, 2021.
2021

Seung-Ha Ryu, Chanh-Tin Truong, and Sung-Jin Choi. "Novel Intuitive Design Scheme for Asymmetric Inductive Power Transfer Coils using FOM-rd Plane Approach." KIPE Annual Conference (2021): 8.
2021

Seung-Ha Ryu and Sung-Jin Choi, "Coil Design Scheme using Single-Turn Field Simulation for Efficiency Optimization of Inductive Power Transfer System," KIPE annual conference, 2021.11.26.
2021

KR Patent 10-2298255 - Adaptive Partial Shading Determinant Method For Solar Array System And Photovoltaic Power Generation Device Using The Method Thereof
2021

Nguyen-Anh Nguyen,Phuong-Ha La, Ngoc-Thao Pham, and Sung-Jin Choi. "Novel Battery Equalizer-Charger Symbiosis Structure based on Three-Port DC-DC Converters." In 2021 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 180-185. IEEE, 2021.
2021

KR Patent 10-2367775 - Method And Apparatus For Measuring Impedance Of Battery Cell On-Line
2021

Yun-A Kang, Ji-Hyeon Park, Ngoc-Thao Pham, and Sung-Jin Choi. "Online SOC Estimation Combining EKF and LSTM Algorithm for Reduced Initial SOC Dependency." KIPE Annual Conference (2021): 123-124.
2021

Thusitha Randima Wellawatta, Young-Tae Seo, and Sung-Jin Choi. "Performance Comparison of Different Solar Array Simulator Control by Ellipse Approximation." The Transactions of the Korean Institute of Power Electronics 26, no. 1 (2021): 16-24.
2021

Tan-Quoc Duong, and Sung-Jin Choi. "Parameter identification for dual-phase shift modulated DAB converters." Journal of Power Electronics 21.12 (2021): 1866-1877.
2021

Phuong-Ha La and Sung-Jin Choi, "Average Modeling of the Switched-Passive-Network Equalizer for Effective Large-scale Battery Simulation," KIPE Annual Conference, 2021
2021

Nguyen-Anh Nguyen, Phuong-Ha La, and Sung-Jin Choi. "High-Speed Battery SOC Adjustment Algorithm utilizing Bi-directional Cell Balancers in Coordination with Pack Charger." KIPE Annual Conference (2021): 119-120.
2021

Chanh-Tin Truong, and Sung-Jin Choi. "Single-stage duty-controlled half-bridge inverter for compact capacitive power transfer system." IEEE Access 9 (2021): 119250-119261.
2021

Yeong Woon Kim, Thusita Randima Wellawatta, Sung-Jin Choi, and Jun Choi. "LLC inverter design for driving surface DBD optimized for airborne bacteria inactivation." Journal of Power Electronics 21, no. 12 (2021): 1878-1887.
2021

Ngoc-Thao Pham, Phuong-Ha La, and Sung-Jin Choi. "Comparison of Different Current Sampling Strategies for an Online Battery Model Identification using Switched-Capacitor Equalizer." KIPE Annual Conference (2021): 117-118.
2020

Phuong-Ha La, and Sung-Jin Choi. "Reactive Balancing Circuit for Paralleled Battery Modules Employing Dynamic Capacitance Modulation." 2020 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2020.
2020

Chanh-Tin Truong, and Sung-Jin Choi. "Investigation of Scale Conversion for Inductive Power Transfer in Series-Series Configuration." Electronics 9.11 (2020): 1851.
2020

Phuong-Ha La, and Sung-Jin Choi. "Novel Dynamic Resistance Equalizer for Parallel-Connected Battery Configurations." Energies 13.13 (2020): 3315.
2020

KR Patent 10-2172728 - Apparatus For Capacitive-Coupled Wireless Power Transmission Using Asymmetric Half Bridge
2020

Nguyen-Anh Nguyen and Sung-Jin Choi. "Low-cost AC-direct Battery Charger with Balancing Feature." KIPE Annual Conference (2020): 246-247.
2020

Phuong-Ha La, and Sung-Jin Choi. "Online DCIR Estimation for Series-connected Battery Cells using Matrix-Switched Capacitor Converter." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2020.
2020

Jun-Yong Eom, Sung-Jin Choi, and Hong-Hee Lee. "Improved Conditional Integrator Anti-Windup Method for Seamless Transfer of Bidirectional DC-DC Converter in Grid-Connected Battery Energy Storage System." The Transactions of the Korean Institute of Power Electronics 25.5 (2020): 333-342.
2020

Tan-Quoc Duong, and Sung-Jin Choi. "Improved Model-based Single Phase Shift Control of Dual Active Bridge Converter for Pulse Power Loads." KIPE Annual Conference (2020): 170-171.
2020

Thusitha Wellawatta, Young-Tae Seo, and Sung-Jin Choi. "Unified Controller for Solar Array Simulator." The Transactions of the Korean Institute of Power Electronics 25, no. 2 (2020): 118-126.
2019

KR Patent 10-1945620 - Apparatus And Method For Tracking Maximum Power Point Using Compensated Incremental Conductance
2019

KR Patent 10-1948425 - SAS Module And Solar Array Simulation System Using The Same
2019

KR Patent 10-1996127 - Wireless Power Transmission System Based On Coupled Electric Field
2019

Tin, Truong Chanh, Phuong-Ha La, and Sung-Jin Choi. "A novel asymmetric half-bridge inverter for capacitive wireless power transfer." 2019 International symposium on electrical and electronics engineering (ISEE). IEEE, 2019.
2019

Chae-Ho Jeong, Hwi-Yeol Im, and Sung-Jin Choi. "A Novel Receiver Sensing Scheme for Capacitive Power Transfer System." The Transactions of the Korean Institute of Power Electronics 24.1 (2019): 62-65.
2019

Phuong-Ha La, Hong-Hee Lee, and Sung-Jin Choi. "A single-capacitor equalizer using optimal pairing algorithm for series-connected battery cells." 2019 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2019.
2019

Hee-Su Choi, and Sung-Jin Choi. "Compact drive circuit for capacitive wireless power transfer system utilizing leakage-enhanced transformer." Journal of Electrical Engineering & Technology 14.1 (2019): 191-199.
2019

Thusitha Randima Wellawatta, and Sung-Jin Choi. "Adaptive partial shading determinant algorithm for solar array systems." Journal of Power Electronics 19.6 (2019): 1566-1574.
2019

Thusitha Randima Wellawatta, and Sung-Jin Choi. “Regulated Incremental Conductance (r-INC) MPPT Algorithm for Photovoltaic Systems.” Journal of Power Electronics, vol. 19, no. 6, 전력전자학회, Nov. 2019, pp. 1544–1553, doi:10.6113/JPE.2019.19.6.1544.
2019

Chae-Ho Jeong, and Sung-Jin Choi. “Graphical Design Plane Analysis for Series-Compensated Resonant Energy Links of Inductive Wireless Power Transfer Systems.” Journal of Power Electronics, vol. 19, no. 6, 전력전자학회, Nov. 2019, pp. 1440–1448, doi:10.6113/JPE.2019.19.6.1440.
2019

KR Patent 10-2274812 - Dynamic Resistance Battery Cell Equalization Apparatus For Capacity Optimization Of Parallel Connected Battery
2019

Tan-Quoc Duong, Phuong-Ha La, and Sung-Jin Choi. "SOC-based Sequencing Equalizer for Parallel-connected Battery Configuration using ANFIS Algorithm." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2019.
2019

Thusitha Randima Wellawatta, and Sung-Jin Choi. "Small-Signal Stability Analysis of Solar Array Hardware Simulators." KIPE Annual Conference, 2019.
2019

Phuong-Ha La, Truong Chanh Tin, and Sung-Jin Choi. "Dynamic Resistance Battery Equalization for Capacity Optimization of Parallel-Connected Cells." 2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019-ECCE Asia). IEEE, 2019.
2019

Phuong-Ha La, and Sung-Jin Choi. "Synthesis of balancing topologies for parallel-connected battery cells by principle of duality." 2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019-ECCE Asia). IEEE, 2019.
2019

Chanh Tin Truong, and Sung-Jin Choi. "Design Considerations of Asymmetric Half-Bridge for Capacitive Wireless Power Transmission." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2019.
2019

Phuong-Ha La, and Sung-Jin Choi. "Optimal Design for Dynamic Resistance Equalization Technique to Minimize Power Loss and Equalization Error." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2019.
2018

Chae-Ho Jeong, "A Control Method to Deal with Wide Input Range and Receiver Misalignment for Capacitive Power Transfer System," Master Thesis, University of Ulsan, 2018
2018

Thusitha Randima Wellawatta, and Sung-Jin Choi. "Universal control strategy using operating point projection technique for solar array hardware emulation." 2018 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2018.
2018

Chae-Ho Jeong, and Sung-Jin Choi. "An Optimal Design of Series-Series Resonant Energy Link in Wireless Power Transfer," KIPE Annual Conference, 2018.
2018

Hwi-yeol Im, Chae-Ho Jeong, Sung-Jin Choi, "A Study on Downsized Experiment Methodology Using Scale Conversion for Inductive Power Transfer System," KIPE Annual Conference, 2018.
2018

Young-Tae Seo, Thusitha Wellawatta, Sung-Jin Choi, "Design and Analysis of 3-Section Hybrid Control Method for Solar Array Simulator," THE TRANSACTIONS OF KOREAN INSTITUTE OF POWER ELECTRONICS 23(1), 2018.2, 47-58.
2018

Duy-Hung Dam, Sung-Jin Choi, and Hong-Hee Lee. "A Droop Based Controller for Super-Capacitor to Compensate the Transient Current and Pulsed Load in DC Microgrid." In 2018 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 4771-4775. IEEE, 2018.
2018

Chae-ho Jeong, Phuong-Ha La, Sung-Jin Choi, and Hee-Su Choi. "A novel target detection algorithm for capacitive power transfer systems." In 2018 IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 3174-3177. IEEE, 2018.
2018

Chae-Ho Jeong, Hee-Su Choi, and Sung-Jin Choi. "Single-stage PWM converter for dual-mode control of capacitive wireless power transmission." 2018 IEEE PELS workshop on emerging technologies: wireless power transfer (wow). IEEE, 2018.
2018

Thusitha Randima Wellawatta, and Sung-Jin Choi. "Reference Point Projection Method for Improved Dynamics of Solar Array Hardware Emulation." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2018.
2018

Phuong-Ha La, and Sung-Jin Choi. "Battery Equalization Method for Parallel-connected Cells Using Dynamic Resistance Technique." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2018.
2018

Thusitha Randima Wellawatta, and Sung-Jin Choi. "A novel partial shading detection algorithm utilizing power level monitoring of photovoltaic panels." 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018.
2017

Young-Tae Seo, "Design and Analysis of Hybrid Control Method for Solar Array Simulator," Master Thesis, University of Ulsan, 2017.
2017

Hee-Su Choi, "A Natching Network Design for Capacitive-coupled Power Transmission with Reduced Volume," Master Thesis, University of Ulsan, 2017
2017

Chae-Ho Jeong, Hee-Su Choi, and Sung-Jin Choi. "FOM-rd plane: An effective design and analysis methodology for resonant energy link in inductive power transfer." 2017 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2017.
2017

Sung-Jin Choi, "Simulation Tool: Thermal Simulation of Power Electronic Devices," Journal of the Korean Society of Power Electronics, Vol. 22, No. 3
2017

Hee-Su Choi, Chae-Ho Jeong, and Sung-Jin Choi. "Optimal Design of Volume Reduction for Capacitive-coupled Wireless Power Transfer System using Leakage-enhanced Transformer." The Transactions of the Korean Institute of Power Electronics 22.6 (2017): 469-475.
2017

Thusitha Randima Wellawatta, Young-Tae Seo, and Sung-Jin Choi. "A Novel Partial Shading Detection Algorithm Utilizing Power Level Monitoring." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2017.
2017

Thusitha Randima Wellawatta, Young-Tae Seo, Hong-Hee Lee and Sung-Jin Choi, "A regulated incremental conductance (r-INC) MPPT algorithm for photovoltaic system." 2017 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2017.
2017

Hee-Su Choi, Chae-Ho Jeong, and Sung-Jin Choi, "A Study on the Structure of Asymmetric Half-Bridge PWM Converter for Capacitive-coupled Wireless Power Transmission," KIPE Annual Conference, 2017.
2017

Hee-Su Choi, and Sung-Jin Choi. "An effective transformer simulation technique using PSIM magnetic elements." 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia). IEEE, 2017.
2017

Jun-Young Park, and Sung-Jin Choi. "A novel simulation model for PV panels based on datasheet parameter tuning." Solar Energy 145 (2017): 90-98.
2017

Young-Tae Seo, Thusitha Wellawatta, and Sung-Jin Choi. "PV Model-based Solar Array Simulator using Hybrid Control Method." KIPE Annual Conference, 2017.
2017

Hee-Su Choi, Chae-Ho Jeong, and Sung-Jin Choi. "Optimal Design of Volume Reduction for Capacitive-coupled Wireless Power Transfer System using Leakage-enhanced Transformer." The Transactions of the Korean Institute of Power Electronics 22.6 (2017): 469-475.
2017

Sung-Jin Choi,"Thermal Modeling of Power Device and LTSPICE SOAtherm Utilization Technique. Journal of Power Electronics, 22(3), 29-33.
2017

Jun-Kyu Park, Thusitha Randima Wellawatta, Sung-Jin Choi, and Jin Hur. "Mitigation method of the shaft voltage according to parasitic capacitance of the PMSM." IEEE Transactions on Industry Applications 53, no. 5 (2017): 4441-4449.
2017

Phuong-Ha La, Hwi-Yeol Im, and Sung-Jin Choi. "Development of Low Cost, High-Performance Miniaturized Lithium-ion Battery Tester Using Raspberry Pi Zero." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2017.
2017

Hee-Su Choi, and Sung-Jin Choi. "A Modeling of Integrated Transformer using PSIM Magnetic Elements." IFOST, 2017
2017

Young-Tae Seo, Thusitha Wellawatta, and Sung-Jin Choi. "Design of PV Model-based Solar Array Simulator Engine using Optimization Method." IFOST 2017
2017

KR Patent 10-1722826 - Photovoltaic Panel Modeling Method And Medium Having Computer Readable Program For Executing The Method
2017

KR Patent 10-1795901 - Method And Apparatus For Simulating Photovoltaic Panel Based On Datasheet
2016

Sung-Jin Choi, “Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers,” Journal of Electrical Engineering and Technology , vol. 11, no. 6. The Korean Institute of Electrical Engineers, pp. 1656–1663, 01-Nov-2016.
2016

US Patent 9276434 B2 - Wireless Power Supply Apparatus, Wireless Charging Apparatus, And Wireless Charging System Using The Same
2016

KR Patent 10-1604172 - Capacitively Coupled Wireless Charging Apparatus
2016

Dong-Hyun Kim, Sung-Jin Choi, Hong-Hee Lee, Paul Jang, "A Feasibility Study on CCM Totem-pole Boost Bridgeless Power Factor Correction Converters using SiC MOSFET," KIPE Annual Conference, 2016.
2016

Young-Tae Seo, Jun-Young Park, and Sung-Jin Choi. "A rapid IV curve generation for PV model-based solar array simulators." 2016 IEEE energy conversion congress and exposition (ECCE). IEEE, 2016.
2016

Chae-Ho Jeong, Hee-Su Choi, Sung-Jin Choi, "A Receiver Detection Algorithm Using Step Response for Capacitive Coupling Wireless Power Systems," KIPE Annual Conference, 2016.
2016

Hee-Su Choi, Sung-Jin Choi, "An Effective Gyrator-based Transformer Modeling using PSIM," THE TRANSACTIONS OF KOREAN INSTITUTE OF POWER ELECTRONICS 21(3), 2016.6, 207-214
2016

Thusitha Wellawatta and Sung-Jin Choi, "An Improved Incremental Conductance MPPT Method for the Photovoltaic Generation," KIPE Annual Conference, 2016.
2016

Sung-Jin Choi*, and Hee-Su Choi. "Analysis and design of capacitive power transmission system employing out-of-band wireless feedback link." 2016 IEEE applied power electronics conference and exposition (APEC). IEEE, 2016.
2016

KR Patent 10-1881658 - Apparatus And Method For Transmitting Capacitive-Coupled Wireless Power
2016

Young-Tae Seo, Jun-Young Park, Sung-Jin Choi, "PV Model-based Solar Array Simulator with Conjugate Gradient Method," KIPE Annual Conference, 2016.
2016

Thusitha Wellawatta, Jun-Kyu Park, Sung-Jin Choi, and Jin Hur. "Reduction method based on looped slot wedges for end to end shaft voltage in inverter driven IPM motor." In 2016 IEEE Conference on Electromagnetic Field Computation (CEFC), pp. 1-1. IEEE, 2016.
2016

Hee-Su Choi, and Sung-Jin Choi. "Optimal Design of Matching Network for Capacitive-coupled Wireless Power Transfer System." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2016.
2016

Jun-Kyu Park, Thusitha Wellawatta, Sung-Jin Choi, and Jin Hur. "Mitigation method of the shaft voltage according to parasitic capacitance of the PMSM." In 2016 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1-6. IEEE, 2016.
2016

Sung-Jin Choi. "LTSPICE 와 변압기 등가회로모델." KIPE Magazine 21.2 (2016): 23-28.
2016

KR Patent 10-1665182 - Current Mirror Type Led Driving Apparatus Super Diode Configuration
2015

Jun-Young Park, "Datasheet-based Modeling of Photovoltaic Panel and Its Applications," Master thesis, University of Ulsan, 2015.
2015

Sung-Jin Choi, and Hee-Su Choi. "Capacitive wireless power transfer system with double matching transformers for reduced stress and extended ZVS range." 2015 IEEE international telecommunications energy conference (INTELEC). IEEE, 2015.
2015

Jun-Young Park, and Sung-Jin Choi. "Datasheet-based circuit parameter extraction method for maximum power point simulation of photovoltaic array." 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia). IEEE, 2015.
2015

Gab-Su Seo, Hye-Jin Kim, Kyu-Chan Lee, Sung-Jin Choi, and Bo-Hyung Cho. "DC-level dimmable LED driver with primary side on-time control for DC distribution." IEEE Journal of Emerging and Selected Topics in Power Electronics 3, no. 3 (2015): 624-632.
2015

US Patent 9165514 B2 - Display Apparatus And Backlight Unit
2015

Jun-Young Park, Sung-Jin Choi, "A New PSIM Model for PV Panels Employing Datasheet-based Parameter Tuning," THE TRANSACTIONS OF KOREAN INSTITUTE OF POWER ELECTRONICS 20(6), 2015.12, 498-508.
2015

Jun-Young Park, and Sung-Jin Choi. "A novel datasheet-based parameter extraction method for a single-diode photovoltaic array model." Solar Energy 122 (2015): 1235-1244.
2015

Hee-Su Choi, Jun-Young Park, Sung-Jin Choi, "A Simple Parameter Extraction Method for Magnetic Transformers using PSIM," KIPE Annual Conference 2015.
2015

Jun-Young Park, Sung-Jin Choi, "An Improved Power Point Tracking Algorithm Using Optimization Method," KIPE Annual Conference, 2015
2015

Hee-Su Choi, Jun-Young Park, and Sung-Jin Choi. "Analysis and control of capacitive-coupled wireless power transmission system." 2015 15th International Conference on Control, Automation and Systems (ICCAS). IEEE, 2015.
2015

Jun-Young Park, and Sung-Jin Choi. "Tolerance design of ballast resistance for multi-string LED driver." In 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), pp. 1-10. IEEE, 2015.
2014

Sung-Jin Choi, "As a special feature of Power Electronics Simulation Tool", Journal of the Korean Power Electronics Society, Vol. 19, No. 1
2014

US Patent 8624940 B2 - Backlight Unit And Display Apparatus
2014

US Patent 8638290 B2 - Backlight Apparatus And Display Apparatus Including The Same
2014

US Patent 8716899 B2 - Power Receiving Apparatus And Wireless Power Transceiving System
2014

US Patent 8749160 B2 - LED Driver Circuit And Method Of Driving LED
2014

US Patent 8749211 B2 - High Voltage Power Supply Having A Soft-Start Circuit
2014

US Patent 8922161 B2 - Three-Dimensional Glasses And System For Wireless Power Transmission
2014

Sung-Jin Choi. "Adaptive current-mirror LED driver employing super-diode configuration." 2014 IEEE International Conference on Industrial Technology (ICIT). IEEE, 2014.
2014

Jun-Young Park, Si-Ho Lee, Jae-Young Hwang, and Sung-Jin Choi, "Analog feedback control using optical link for capacitive-coupled wireless power transmission system ," KIPE Annual Conference, 2014.
2014

Jun-Young Park, Sung-Jin Choi, "Improved Parameter Extraction Algorithm for Photovoltaic Array Circuit Model." KIPE Annual Conference , 2014.7, 369-370
2013

Byungwoo Choi, and Sung-Jin Choi. "Design of capacitively-coupled contactless charging system using class-E amplifier." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2013.
2013

Jun-Young Park, and Sung-Jin Choi. "Design optimization of a linear LED driver using a computational statistics." Proceedings of the KIPE Conference. The Korean Institute of Power Electronics, 2013.
2013

Sung-Jin Choi, "BMS (Battery Management System," Journal of the Korean Society of Power Electronics, Vol. 19, No. 6
2013

Sung-Jin Choi, "Energy harvesting technology and power electronics," Journal of the Korean Society of Power Electronics, Vol. 18, No. 2
2013

US Patent 8467204B2 - High Voltage Power Supply
2013

Jong-Won Shin, Sung-Jin Choi, and Bo-Hyung Cho. "High-efficiency bridgeless flyback rectifier with bidirectional switch and dual output windings." IEEE transactions on power electronics 29.9 (2013): 4752-4762.
2012

Cong-Long Nguyen, Hong-Hee Lee, and Sung-Jin Choi. "Power factor control scheme for zero current harmonics of battery charger in EVs." 2012 IEEE Vehicle Power and Propulsion Conference. IEEE, 2012.
2012

EU Patent - EP 2 237 645 B1 - Current Balancing Apparatus, Power Supply Apparatus, Lighting Apparatus, And Current Balancing Method Thereof
2012

Sung-Jin Choi, and Taehoon Kim. "Symmetric current-balancing circuit for LED backlight with dimming." IEEE Transactions on Industrial Electronics 59, no. 4 (2011): 1698-1707.
2010

EU Patent - EP 2 262 072 B1 - Apparatus For Preventing Over/Under Voltage, Light Emitting Module And Display Apparatus
2009

Joung-Hu Park, Bo-Hyung Cho, Sung-Jin. Choi, and Sang-Min Lee. "Analysis of the thermal balance characteristics for multiple-connected piezoelectric transformers." IEEE transactions on ultrasonics, ferroelectrics, and frequency control 56, no. 8 (2009): 1617-1626.
2009

Joung-Hu Park, Jong-Bok Baek, Bo-Hyung Cho, Sung-Jin Choi, "Performance Evaluation of Switching Amplifier in Micro-positioning Systems with Piezoelectric Actuator," THE TRANSACTIONS OF KOREAN INSTITUTE OF POWER ELECTRONICS 14(1), 2009.2, 62-71
2007

Joung-hu Park, Sung-Jin Choi, S. Lee and B. H. Cho, "Gain-adjustment Technique for Resonant Power Converters with Piezoelectric Transformer," 2007 IEEE Power Electronics Specialists Conference, 2007, pp. 2549-2553, doi: 10.1109/PESC.2007.4342416.
2007

Joung-Hu Park, Sang-Min Lee, Sung-Jin Choi, and Bo-Hyung Cho. "Design Consideration of Parallel–Parallel Connected Piezoelectric Transformer for Thermal Balance." Japanese Journal of Applied Physics 46, no. 10S (2007): 7067.
2006

Myounghwan Ryu, Sung-Jin Choi, Sangmin Lee, and Bo H. Cho. "A new piezoelectric transformer driving topology for universal input AC/DC adapter using a constant frequency PWM control." In Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC'06., pp. 4-pp. IEEE, 2006.
2006

Sung-Jin Choi, et al. "Adaptive frequency control strategy for piezoelectric transformer in AC/DC adapter applications using phase detector." Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC'06.. IEEE, 2006.
2005

Sung-Jin Choi, Kyu-Chan Lee, and Bo Hyung Cho. "Design of fluorescent lamp ballast with PFC using a power piezoelectric transformer." IEEE Transactions on Industrial Electronics 52.6 (2005): 1573-1581.
2005

Sung-Jin Choi, Taeil Kim and B. H. Cho, "Design of half-bridge piezo-transformer converters in the AC adapter applications," Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005., 2005, pp. 244-248 Vol. 1, doi: 10.1109/APEC.2005.1452927.
2005

Sangmin Lee, Myounghwan Ryu, Sung-Jin Choi, Bo H.Cho, "A New Piezoelectric Transformer Driving Topology for Universal Input AC/DC Adapter using PWM control," KIPE Annual Conference, 2005
2005

Taeil Kim, Sung-Jin Choi, Sangmin Lee, and Bo H. Cho. "New piezoelectric transformer adapter with universal input voltage range." In 2005 International Conference on Power Electronics and Drives Systems, vol. 2, pp. 1223-1227. IEEE, 2005.
2005

Sung-Jin Choi, Taeil Kim, Sangmin Lee, and Bo H. Cho. "Modeling and characterization of radial-mode disk-type piezoelectric transformer for AC/DC adapter." In 2005 IEEE 36th Power Electronics Specialists Conference, pp. 624-629. IEEE, 2005.
2004

En-Sung Park, Sung Jin Choi, J. Moon Lee and B0 H. Cho, "A soft-switching active-clamp scheme for isolated full-bridge boost converter." Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC'04.. Vol. 2. IEEE, 2004.
2004

T. I. Kim, J. H. Park, S. M. Lee, Sung-Jin Choi, B. H. Cho, "Low Cost Class-E Converter for Power Conversion Operation of Piezoelectric Transformer," KIPE Annual Conference , 2004.7, 696-699
2000

J.H.Park, Sung-Jin Choi, B.H. Cho, "Low-Cost Improved 2 Stage Inverter for TFT-LCD Monitor Backlight," KIPE Annual Conference , 2000.11, 189-192
2000

J.H.Park, Sung-Jin Choi, Bo H. Cho, "Low-cost asymmetric control half-bridge inverter for LCD backlight," KIPE Annual Conference , 2000.7, 509-512
1999

In-Kyu Lee, Sung- Jin Choi, Kyu-Chan Lee, Bo. H. Cho."Modeling and Stability Analysis of Automotive HID Lamp Ballast," KIPE Annual Conference, 1999.7, 411-414
1999

In-Kyu Lee, Sung-Jin Choi, Kyu-Chan Lee, and Bo H. Cho. "Modeling and control of automotive HID lamp ballast." In Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No. 99TH8475), vol. 1, pp. 506-510. IEEE, 1999.
1998

Sung-Jin Choi, Kyu-Chan Lee and B. Cho, "Design of fluorescent lamp ballast with PFC using a power piezoelectric transformer," APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition, 1998, pp. 1135-1139 vol.2, doi: 10.1109/APEC.1998.654039.