A5101528382- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Multilevel Inverters and Converters
- HVDC Systems and Fault Protection
- Advanced Battery Technologies Research
- Fuel Cells and Related Materials
- Microgrid Control and Optimization
- Cardiac Structural Anomalies and Repair
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Electric and Hybrid Vehicle Technologies
- High-Voltage Power Transmission Systems
- Advancements in Photolithography Techniques
- Advancements in Battery Materials
- Induction Heating and Inverter Technology
- Supercapacitor Materials and Fabrication
- Photovoltaic System Optimization Techniques
- Power Systems and Renewable Energy
- Railway Systems and Energy Efficiency
General Electric (United States)
2023
GE Global Research (United States)
2023
Florida State University
2015-2020
Florida A&M University - Florida State University College of Engineering
2018
GlobalFoundries (Germany)
2014
Zhejiang University
2011-2013
Zhejiang Institute of Mechanical and Electrical Engineering
2011
A 10nm logic platform technology is presented for low power and high performance application with the tightest contacted poly pitch (CPP) of 64nm metallization 48nm ever reported in FinFET on both bulk SOI substrate. 0.053um<sup>2</sup> SRAM bit-cell a corresponding Static Noise Margin (SNM) 140mV at 0.75V. Intensive multi-patterning various self-aligned processes have been developed 193i lithography to overcome optical patterning limit. Multi-workfunction (WF) gate stack has enabled provide...
A silicon carbide (SiC) T-type LCL inverter can achieve smaller device loss than two-level topology, however, its improvement on power density is limited by current ripple magnetic components as switching frequency increases. This paper presents a five-level (5LT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) photovoltaic (PV) that achieves better utilization of SiC devices the traditional three-level topology at higher frequency. The...
Due to the long cold start time and slow dynamics of proton exchange membrane (PEM) fuel cell (FC) stack, operating modes transfer control strategy for uninterruptible power supply (FC-UPS) is different from traditional (UPS) system. In this paper, a seamless strategy, which suitable FC-UPS, proposed. The conversion architecture FC-UPS presented with characteristic analysis PEMFC requirements UPS. Then, scheme investigated. proposed not only capable guaranteeing load voltage, but also...
In this paper, a 1200 V, 100 A T-type full SiC power module is evaluated in five-level photovoltaic (PV) inverter. The characterized with double pulse test, and based on the results, loss evaluation of PV inverter performed. high density 27 W/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> 3 kW/kg, peak efficiency 99.2% are achieved for lab prototype. de-sat short-circuit protection scheme using commercial driver chip ACPL339J...
In this paper, ground leakage current suppression in a 60-kW 5-level T-type (5LT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) transformerless SiC photovoltaic (PV) inverter has been presented. The common mode (CM) equivalent circuit is analyzed based on high frequency (HF) CM loop and low (LF) loop, respectively. the 5LT inverter, derived HF voltage (CMV) found to have 86% reduction compared that of 3-level (3LT inverter. simulation...
This paper investigates a three-phase four-wire fuel cell power system. The system is sensitive to the load characteristic in stand-alone mode, because variation or unbalance of will affect safety and lifespan cell. A novel management unit (PMU) with its control strategy proposed. PMU can compensate slow dynamics. In addition, acts as dc bus capacitors deal low-frequency current ripple. Therefore, large electrolytic be eliminated derived whole verified by experimental results.
A breaker-less shipboard medium-voltage dc (MVDC) system is gaining more attention recently due to its advantage in dealing with a fault by using switched-mode power modules and disconnectors. The specific module investigated this paper the conversion (PCM) that transforms from MVDC low-voltage (LVDC) bus. PCM plays an important role system-level management. emerging isolated modular multilevel dc/dc converter widely used dual active bridge are promising solutions for applications. control...
A de-sat based short-circuit protection scheme using commercial driver for SiC MOSFETs is presented and experimentally verified on 1200V 3-level T-type MOSFET module in this paper. Response time very critical the of due to limited withstand (SCWT). Soft turn-off required avoid high voltage spike during fault current. With circuit, 600 ns response realized, a two-stage soft circuit with gate clamping implemented. stabilizing without affecting switching loss also proposed prevent false...
With increased switching frequency and multilevel topology, it is possible for a wide-bandgap (WBG) device based converter to be connected the grid without line filters. In this paper, high power density filter-less Photovoltaic (PV) inverter designed experimentally demonstrated. A design proposed completely remove AC side filters, thereby size weight of magnetic components are reduced. 100 kW three-phase two stage prototype has been built in laboratory, which achieves 5 kW/kg, measured CEC...
Fuel cell (FC) power system is considered as an alternative energy generation in the future. This paper studies bidirectional DC/DC converter for a 30kW three-phase fuel system. The FC sensitive to load characteristics stand-alone mode, because rapid change or unbalance of will endanger safety and expectancy cell. with storage component used provide dynamic avoid fast changing output. In addition, it acts DC bus capacitors absorb low frequency current ripple. Therefore, separated from ripple...
SiC T-type LCL inverter can achieve smaller device loss than two-level topology, however its improvement on power density is limited by current ripple magnetic components as switching frequency increases. This paper presents a paralleled-five-level (P5L) PV which achieves better utilization of devices traditional three-level (3L) topology at higher frequency. Comparison the P5L with 3L has been presented. The design challenges and methods to solve balancing, short circuit protection, digital...
Shipboard Medium Voltage Direct Current (MVDC) system has gained increasing popularity. However, fault management of MVDC is one critical challenge. In this paper, a modular multilevel dual active bridge (M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> DAB) converter proposed to be applied in shipboard system. Under the presented unified control strategy, bi-directional isolated dc/dc with protection and ride-through capability can...
This paper is focused on studying a 1200V SiC JFETs cascode device released recently. The gate drive circuit design and switching performance are compared with its counterpart, 1200 V MOSFETs. research finds out the of similar to that In addition, an optimized driver designed minimize loss without causing "crosstalk" issue. experimental results DPT (single pulse test) MPT (multiple provided verify proposed compare two devices.
The Power Conversion Module (PCM) plays an important role in a shipboard MVDC system which transforms power from medium-voltage dc to low voltage bus. In this paper, isolated modular multilevel dc-dc converter (iM2DC) and dual active bridge (DAB) are designed for 300 kW PCM respectively. total device rating, passive component size, conversion efficiency of these two topologies calculated compared. addition, their performance during fault have been analyzed simulation results presented.
In this paper ground leakage current suppression in a 50 kW 5-level T-type transformerless PV inverter has been presented. Compared to 3-level inverter, topology allows simple modulation method such as carrier-based (CB) PWM can be used suppress the without penalty of traditional methods. Phase disposition (PD) and phase opposition (POD) based CB applied topology. The spectrum analysis demonstrated that PD POD will generate same voltage spectrum. addition, common-mode (CM) derived CM choke...
The isolated modular multilevel dc/dc converter (IM2DC) based on (MMC) is a promising power conversion topology in HVDC/MVDC applications. In this paper, novel phase-shifted square wave modulation strategy (PS-SWM) proposed for IM2DC. Compared to the conventional methods, technique achieves smaller dc inductance due higher equivalent switching frequency. addition, required capacitor energy can be reduced, which decreases size without total device rating (TDR) penalty. operation principles of...
In this article, an active fault current sharing (FCS) strategy is proposed to improve the dc circuit breaker (CB) operation in a breaker-based medium-voltage (MVdc) system. The peak turn-off of CBs can be decreased by controlling existing converters located parallel with activated share current. This reduction effect amplified from systematic perspective since one single converter FCS benefit different various scenarios. short-circuit scenarios shipboard MVdc system are analyzed and...
A new converter using a switched-inductor cell integrated with switched-capacitor within boost-like structure is proposed. The can achieve very high dc conversion ratio. It serve as the front-end dc-dc for fuel in UPS system. inductors and capacitors are switched parallel-series configuration. charging circuit of from source separated load, what benefit DCM operation at light load. analysis leading to formula gain break-down calculation losses given. Simulation results 100 V 700 V, 10 kW...
PV inverters without the isolation transformer become more attractive due to higher efficiency and lower weight. However, it may exist DC offset current problem is critical power system. In this paper a novel control strategy suppress injection of inverter grid investigated. It based on idea accurately sensing voltage inverter. Since component output can be eliminated, effectively suppressed. Finally scheme verified by experiment.
This paper studies construction and control of the proton exchange membrane fuel cell (PEMFC) power system. A high efficiency topology without electrolytic capacitor is proposed for both grid-connected mode stand-alone mode. voltage balance strategy front-end DC/DC converter presented. Power management unit (PMU) introduced to provide transient on step load absorb low-frequency ripple under condition unbalance load. It improves dynamic response system replaces bulky DC-Bus capacitors....