Woongkul Lee

ORCID: 0000-0002-2282-6837
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About
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Research Areas
  • Silicon Carbide Semiconductor Technologies
  • Multilevel Inverters and Converters
  • Electric Motor Design and Analysis
  • Advanced DC-DC Converters
  • Electromagnetic Compatibility and Noise Suppression
  • Microgrid Control and Optimization
  • Induction Heating and Inverter Technology
  • Sensorless Control of Electric Motors
  • Electrostatic Discharge in Electronics
  • Advanced Battery Technologies Research
  • GaN-based semiconductor devices and materials
  • Magnetic Bearings and Levitation Dynamics
  • Magnetic Properties and Applications
  • Electric Vehicles and Infrastructure
  • Photovoltaic System Optimization Techniques
  • Electric and Hybrid Vehicle Technologies
  • Hydraulic and Pneumatic Systems
  • Wireless Power Transfer Systems
  • High voltage insulation and dielectric phenomena
  • Heat Transfer and Optimization
  • Recycling and Waste Management Techniques
  • Control Systems in Engineering
  • Extraction and Separation Processes
  • Semiconductor materials and devices
  • Iterative Learning Control Systems

Purdue University West Lafayette
2024-2025

Michigan State University
2021-2024

University of Wisconsin–Madison
2014-2023

The adoption of silicon carbide (SiC) MOSFETs in variable speed drives (VSDs) makes it possible to increase the inverter switching frequency up several hundred kilohertz without incurring excessive loss. As a result, harmonic currents and related losses machine can be significantly reduced, dynamic performance motor will also improved. However, high common mode (CM) electromagnetic interference (EMI) emission drive system presenting new challenges on CM choke design. In literature, chokes...

10.1109/tia.2017.2672919 article EN IEEE Transactions on Industry Applications 2017-02-22

A multifunctional grid-connected inverter (MFGCI) has been a promising solution to mitigate power quality problems in distributed generation system and microgrid applications. However, the capability of conventional MFGCI is limited when compensating voltage-based problem. In this paper, new configuration proposed improve both current-based issues named shunt-series-switched (SSS-MFGCI). The SSS-MFGCI can be connected series or parallel grid by implementing bidirectional switches provide...

10.1109/tia.2018.2861737 article EN IEEE Transactions on Industry Applications 2018-07-31

Forced induction uses otherwise wasted exhaust gases to improve the volumetric efficiency of an engine allowing for higher thermodynamic efficiency. As fuel economy and greenhouse gas emission standards are projected be much more stringent globally, use a forced in passenger cars light duty trucks has become new trend automotive industry. The aerodynamic matching driven turbocharger is compromise transient response at low energy levels power targets on high. toward highly boosted downsized...

10.1109/tte.2016.2620172 article EN IEEE Transactions on Transportation Electrification 2016-10-21

Wide bandgap semiconductors, such as gallium nitride (GaN)-based power devices have become increasingly popular in the automotive industry due to their low on-state resistance and fast switching capabilities. These are sought replace silicon (Si) electronics converters for vehicular applications. GaN dissipate less energy during each event, thus, converter designers can significantly increase frequency without increasing losses, relative Si converters. However, one item of concern is that...

10.1109/tte.2016.2622005 article EN IEEE Transactions on Transportation Electrification 2016-10-26

This paper introduces a new concept of common mode voltage cancellation for pulse width modulated motor drives, aiming at solving issues such as ground leakage current, electromagnetic interference, and bearing current. The balanced inverter topology dual-winding stator configuration are proposed practical realization. Implementation considerations on the influence circuit asymmetry also investigated. Finally, gallium nitride HEMT based induction drive prototype is built tested to evaluate...

10.1109/tpel.2017.2688370 article EN IEEE Transactions on Power Electronics 2017-03-28

Integrated motor drives (IMDs) can deliver substantial economic benefits by replacing low-efficiency fixed-speed motors with compact adjustable-speed that combine the power electronics and into same physical structure. IMDs are currently implemented using voltage-source inverters since this topology is naturally compatible conventional silicon-based devices. However, major advances in development of new types semiconductor switches made from wide-bandgap (WBG) materials such as silicon...

10.1109/itec.2018.8450127 article EN 2018-06-01

The purpose of this paper is to review three emerging technologies for grid-connected distributed energy resource in the power system: inverters (GCIs), utility-scaled battery storage systems (BESSs), and vehicle-to-grid (V2G) application. overview GCIs focuses on topologies functions. Different functions BESS are introduced a comprehensive provided currently operating BESSs that interconnected at distribution level. Possible grid support presented. This also presents current...

10.1109/itec.2017.7993272 article EN 2017-06-01

Four-quadrant (FQ) switches that have both bidirectional current and reverse-voltage blocking (RVB) capabilities are appealing candidates for use in current-source inverters (CSI) to significantly reduce the switch conduction losses. However, FQ characteristics of these can create problems during switching events by causing transient overcurrent pulses damage inverter. Commutation methods CSI topologies address challenges presented this article. Several key aspects performance implementation...

10.1109/tia.2021.3096179 article EN IEEE Transactions on Industry Applications 2021-07-09

The electrification of a forced induction system (FIS) has emerged as feasible solution for low greenhouse gas emission and high fuel economy in passenger cars light-duty trucks. A high-speed electric motor conjunction with the conventional FIS numerous benefits including better transient response higher engine output power. single-phase brushless dc (BLDC) possesses number attractive features this application efficiency, cost, robustness, operation capability. However, it generates torque...

10.1109/tvt.2018.2866779 article EN IEEE Transactions on Vehicular Technology 2018-08-22

Conventional current-source inverters (CSIs) using silicon-based reverse-blocking (RB) switches typically suffer from high conduction loss, low switching frequency, and bulky size. New bidirectional (BD) (also called four-quadrant switches) built wide bandgap semiconductor materials such as gallium nitride silicon carbide offer both reverse-voltage-blocking capability loss that make them appealing candidates for increasing the CSIs efficiency. This article proposes a new modulation scheme an...

10.1109/tia.2022.3149461 article EN IEEE Transactions on Industry Applications 2022-02-08

Due to low loss and fast switching capabilities of gallium nitride (GaN) based power devices; there has been a strong interest in the replacement silicon (Si) devices electronics converters for various applications. However, one concerns is that high speed (dv/dt di/dt) GaN will deteriorate EMI emission converters. Hence, this paper studies common mode by taking synchronous boost converter as case study. It be shown that, exploiting full increases very frequency range up 10dB comparing Si...

10.1109/apec.2017.7930794 article EN 2022 IEEE Applied Power Electronics Conference and Exposition (APEC) 2017-03-01

The use of gallium nitride (GaN) high-electron mobility transistors (HEMTs) is a promising solution for highly efficient motor drive design due to their high-switching speed and low on-state resistance. However, the higher reverse voltage drop GaN HEMTs than that conventional silicon (Si) devices generates significant conduction loss during freewheeling period. This phenomenon can be exacerbated especially when regenerative braking or bipolar PWM utilized since period increases. It also lead...

10.1109/ecce.2017.8096628 article EN 2022 IEEE Energy Conversion Congress and Exposition (ECCE) 2017-10-01

Wide bandgap devices are widely believed to be the enabler of next generation power electronic systems due their superior characteristics such as low loss, high speed, and temperature operating capabilities. In automotive industry, wide will also a game changer in many aspects hybrid/electric vehicles, most notably electric propulsion battery charging systems. This paper present comprehensive review switching adoption vehicles.

10.1109/itec.2017.7993332 article EN 2017-06-01

The combination of wide-bandgap (WBG)-enabled current-source inverter (CSI) and integrated motor drive (IMD) has been shown to provide several advantages compared voltage-source (VSI)-based drives either with long output cables or in IMD configurations. However, the higher conduction loss associated using conventional switches series diodes CSI makes thermal cooling CSI-IMD more challenging. To relieve this challenge, new soft-switching topologies bidirectional (BD) have designed, built,...

10.1109/ecce44975.2020.9236394 article EN 2022 IEEE Energy Conversion Congress and Exposition (ECCE) 2020-10-11

This article investigates the total PWM-induced power losses in interior permanent magnet (IPM) machines excited by wide bandgap (WBG)-based voltage-source inverters with different pulsewidth modulation (PWM) schemes and a range of switching frequencies. The PWM current ripple characteristics are predicted compared using an accurate analytical model. Three enhanced loss estimation models utilized to estimate each three major machine materials: stator form-wound windings, rotor iron cores,...

10.1109/tia.2022.3178979 article EN IEEE Transactions on Industry Applications 2022-05-30

10.1109/apec48143.2025.10977110 article EN 2022 IEEE Applied Power Electronics Conference and Exposition (APEC) 2025-03-16

10.1109/apec48143.2025.10977118 article EN 2022 IEEE Applied Power Electronics Conference and Exposition (APEC) 2025-03-16

Modernized grid needs ancillary service as a variety of distributed energy resources are connected. Vehicle-to-grid (V2G) application is one promising resources, which enables to transfer bidirectional power between batteries plug-in electric vehicle and the well offer grid. Benefits V2G voltage frequency regulation, spinning reserves. To achieve benefits application, grid-connected inverter (GCI) its control method significant. This paper presents methods GCI in mitigate balanced sag....

10.1109/pesgm.2016.7741910 article EN 2016-07-01

The availability of wide-bandgap (WBG) power switches makes it possible to excite electric machines with much higher pulsewidth modulation (PWM) switching frequencies. This article experimentally characterizes the magnetic and iron loss properties lamination steels over a wide range PWM frequencies magnetization states excited by voltage-source inverter using GaN-based WBG switches. With collected hysteresis loop data, new frequency-interconnected dynamic Jiles-Atherton (J-A) model has been...

10.1109/tia.2021.3075647 article EN IEEE Transactions on Industry Applications 2021-04-27
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