A5045335018- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Dielectric materials and actuators
- Wireless Power Transfer Systems
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Multilevel Inverters and Converters
- Innovative Energy Harvesting Technologies
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- GaN-based semiconductor devices and materials
Columbia University
2013-2019
The Metacapacitors project aims to improve efficiency, functionality and form factor of offline power converters suitable for LED solid-state lighting, with a view developing an attractive technology platform load management conversion across broad range applications. Based on integrated switched-capacitor (SC) topologies, the adopts approach from materials devices circuits. We designed capacitors based high-κ dielectric nanocrystals, that can be prepared using high-throughput...
This paper presents a hybrid-switched-capacitor-resonant (HSCR) light-emitting diode (LED) driver based on stackable switched-capacitor (SC) converter IC rated for 15-20-W applications. Bulky transformers have been replaced with an SC ladder to perform high-efficiency voltage step-down conversion; LC-resonant output network provides almost lossless current regulation and demonstrates the potential of capacitive galvanic isolation. The integrated modules can be stacked in domain handle large...
LEDs have finally emerged as the dominant lighting technology. As such, industry values power converters that high efficiency, unity factor, minimal flicker, dimming, low cost, and a small form factor. This paper presents an integrated circuit (IC) LED driver is designed to achieve these goals. It introduces multilevel with sigma-delta modulation IC space. The features pair of sigma-delta-controlled converters. first rectifier responsible for factor correction dimming. second bidirectional...
A stackable switched-capacitor (SC) converter IC for a hybrid-SC-resonant LED driver using off-chip ceramic capacitors is presented in this paper. The can be configured to handle range of input voltages through chip-stacking the voltage domain. tested delivers 17.6W at 470mA load with 90% peak efficiency from rectified 120V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">AC</sub> line (170V xmlns:xlink="http://www.w3.org/1999/xlink">DC</sub> )...
Nanotechnology offers a variety of pathways to novel and low cost device fabrication for future that will undoubtedly contain literally billions ubiquitous electronic devices. Nanocomposite metal-insulator-metal (MIM) capacitors are interest due the possibility reducing number discrete components in printed circuit boards, alternatively using embedded or directly nanopackaging conjunction with integrated circuits. Flexible substrates also become candidates when employing processing...
LEDs are rapidly emerging as the dominant light source. As such, lighting industry values power converters with high efficiency, unity factor, minimal flicker, dimming, low cost, and small form factor. This paper presents an integrated circuit (IC) LED driver that is designed to achieve these goals. It also introduces multilevel sigma delta modulation IC space. The features a pair of controlled converters. first rectifier responsible for factor correction (PFC) dimming. second inverter used...
Nanocomposite metal-insulator-metal (MIM) capacitors are of great interest due to the possibility reducing number discrete components in printed circuit boards, and alternatively using embedded or directly conjunction with integrated circuits. Flexible substrates also become candidates when employing low processing temperatures. In addition compatibility nanomanufacturing, prospect designing a nanocomposite dielectric, by combining colloidal nanoparticle fillers polymer hosts, lends itself...