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Conductivity controlled bipolar power devices
Background
Dr. Alex Q. Huang has developed a new power semiconductor technology, a Conductivity Controlled Bipolar Transistor (CCBT), with primary application in power electronic converters. Dr. Huang is the Dula D. Cockrell Centennial Chair in Engineering at the Department of Electrical and Computer Engineering and a professor at The University of...
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Synchronous ripple filter for switch-mode systems
Problem statement
Switch-mode systems such as power converters usually generate significant electromagnetic interference (EMI) in the form of high-frequency current at their input (e.g., the grid) and/or output (e.g., processor supply voltages), which must be filtered to meet product specifications and/or regulations. This is typically accomplished...
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Bidirectional DC/AC topologies
BackgroundRecently, more and more power conversion applications, such as PV micro-inverters, battery storage systems, on-board EV chargers, etc., require isolated DC/AC power converters. The markets for these applications are rapidly growing. The conventional two-stage topology solutions have simple control, higher efficiency, and lower cost. However,...
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Inverter stacking amplifier
BackgroundThe front-end amplifier typically dominates the overall noise and power performance of a sensor system. There exists a fundamental tradeoff between noise and power for an amplifier, which is well captured by the noise efficiency factor (NEF). Minimizing this tradeoff (or NEF) is crucial for a wide range of power and energy constrained applications,...
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Lateral power semiconductor switch
Background A majority of power devices are Si MOSFET or IGBT. Wide band gap (WBG) material based devices are posed to replace Si MOSFET and IGBT in the future. Silicon Carbide (SiC) and Gallium Nitride (GaN) are the two most matured materials, with SiC considered the more promising of the two. Today, SiC power MOSFET is made vertically; GaN is made...
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Novel AC-AC converter
BackgroundThe 60Hz transformer has been around for more than 100 years. It does one job, convert one AC voltage to another. Using power electronic AC/AC converter to replace this has the potential advantage of lower size and more functionalities. However, today there is a short coming in the AC/AC converter topology/circuit. This invention intends to...
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