Power electronics is the application of solid-state electronics for the control and conversion of electric power. Power electronics control system consist of various electronics technologies which include a power converter, sensor, and control technology based on analog or digital circuitry.
Power electronics can be found wherever there is a need to modify a form of electrical energy (i.e. change its voltage, current or frequency). The power range of these systems is from some milliwatts (as in a mobile phone) to hundreds of megawatts (e.g. in a HVDC transmission system). With "classical" electronics, electrical currents and voltage are used to carry information, whereas with power electronics, they carry power.
In modern systems, power electronics is performed with semiconductor switching devices such as DIODEs, MOSFETs, and IGBTs. In contrast to electronic systems for processing of signals and data, power electronics processes substantial amounts of electrical energy. Thus, the most important performance of power electronics becomes the efficiency.
An AC/DC Inverter is the most typical power electronics system found in many consumer electronic devices, e.g. television sets, personal computers, battery chargers, etc. The power range is typically from tens of watts to several hundred watts. In industry, the most common application is the variable speed drive that is used to control an induction motor. The power range of VSDs start from a few hundred watts and end at tens of megawattes.
Next-generation power module packaging technologies are investigated to achieve high efficiency and reliability in high-power-density power conversion systems. Parasitic inductance and capacitance in power loops are precisely analyzed, with a focus on developing low-parasitic packaging structures that minimize their impact on switching performance. Low-inductance packaging structures based on die-embedded PCBs are designed and optimized in terms of both electrical and thermal performance. In addition, parasitic analysis and reduction techniques for WBG-based intelligent power modules (IPMs) are explored to enable high-frequency, high-efficiency power conversion.
This research focuses on short-circuit protection and active gate-driving technologies for the safe and efficient operation of WBG power semiconductors. High-speed protection techniques are developed to detect and interrupt short-circuit and overcurrent conditions, while active gate-driving techniques are employed to control switching transient characteristics. These functions are implemented through analog signal-processing circuits and digital control logic, leading to the development of analog and digital integrated circuits (ICs) specifically tailored for WBG power semiconductor applications. Comprehensive verification, including circuit design, layout, simulation, and experimental validation with power semiconductor devices, is performed to realize high-performance and highly reliable power ICs.
Gate driver circuit technologies are developed to ensure stable operation of WBG power semiconductors under high-voltage and high-speed switching conditions. Particular attention is given to common-mode transients, gate oscillations, noise, and false triggering caused by high dv/dt and di/dt. Gate-driving circuits and signal transmission architectures are designed to mitigate these effects and improve switching stability. High-voltage isolation, common-mode transient immunity (CMTI), gate-drive power supplies, and gate-current amplification stages are also comprehensively considered to enhance the stability and reliability of gate driver systems. These technologies provide a foundation for highly reliable WBG power semiconductor operation in industrial power conversion systems and future mobility applications.
This research covers the modeling, design, and control of modular multilevel converters (MMCs) for MVDC/HVDC power conversion systems. Advanced control algorithms are developed to ensure stable and efficient system operation, while system dynamics and stability are analyzed under various grid and operating conditions. Cybersecurity is also addressed through cyberattack modeling and the development of detection and response techniques for various attack scenarios. The proposed methods are evaluated through simulation and real-time hardware-in-the-loop simulation (HILS), with an emphasis on improving the stability, reliability, and cyber resilience of power conversion systems.
This research focuses on converter topologies and design methodologies tailored to the applications and requirements of various power conversion systems. Power-stage circuits and control algorithms are designed and optimized by considering efficiency, power density, electrical isolation, thermal performance, and operational stability. Design performance is verified through simulation and prototype development, followed by comprehensive evaluation under various input, output, and load conditions. These efforts support the development, implementation, and verification of high-efficiency, high-power-density power conversion systems, including on-board chargers (OBCs) and low-voltage DC-DC converters (LDCs). tems.
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