Search Results - yan+dong

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Single Gate Driver System for DC Circuit Breakers
THE CHALLENGE Single power semiconductor devices cannot meet the voltage demands for the solid-state switch in medium voltage DC circuit breakers (DCCBs) due to limitations in their voltage blocking capabilities. As a result, commercially available devices are often connected in series to meet the final clamping voltage target. Voltage balancing across...
Published: 9/29/2021   |   Inventor(s): Jian Liu, Lakshmi Ravi, Dong Dong, Rolando Burgos, Steve Schmalz
Keywords(s):  
Category(s): Electrical
Islanding Detection Using Phase-Locked-Loop Small-Signal Instability For Three-Phase Power Inverters
A simple and effective anti-islanding detection is required to meet IEEE standard 1547 for every distributed generation unit. Many research papers and patents work on this issue, and there exists lots of solutions. All the existing solutions suffer the complicated design and lots of implementation procesess. Some of them tend to destabilize the grid...
Published: 9/20/2012   |   Inventor(s): Dong Dong, Dushan Boroyevich, Paolo Mattavelli, Bo Wen
Keywords(s):  
Category(s): Electrical
Two-Stage Bi-Directional Single-Phase Converter with DC-Link Capacitor Reduction
It is well-known that single-phase ac-dc conversion requires a bulky dc-link capacitor for filtering the ripple power from the grid, thus leading a overall bulky converter size. Also, in order to interface a dc renewable energy system to a single-phase utility grid, bi-directional power flow control and dc-bus voltage regulation are major concerns....
Published: 9/20/2012   |   Inventor(s): Dong Dong, Dushan Boroyevich, Ruxi Wang, Fred Wang
Keywords(s):  
Category(s): Electrical
Anti-Islanding Detection Algorithm and Modeling Approach for Three-Phase Distributed Generation Unit
A simple and effective anti-islanding detection is required to meet IEEE standard 1547 for every distributed generation unit. Many research papers and patents work on this issue, and there exists lots of solutions. All the existing solutions suffer the complicated design and lots of implementation processes. Some of them tend to destabilize the grid...
Published: 9/14/2012   |   Inventor(s): Dong Dong, Dushan Boroyevich, Paolo Mattavelli
Keywords(s):  
Category(s): Electrical
DC Leakage Current Reduction for Single-Phase Full-Bridge Converter
The switching-frequency dc leakage current issue exists in the single-phase full-bridge topology with the unipolar modulation switching scheme. It is important to reduce the leakage current, which has a negative impact on the solar panels. With the emerging market on solar inverter, there are lots of patents filed by different companies on solving this...
Published: 9/14/2012   |   Inventor(s): Dong Dong, Fang Luo, Dushan Boroyevich, Paolo Mattavelli
Keywords(s):  
Category(s): Electrical
DCR Current Sensing Method for Adaptive Voltage Positioning in Coupled Inductor Voltage Regulators
The conventional current sensing method with sensing resistors produces additional losses and decreases the efficiency in the multiphase DC-DC converters with coupled inductors. A novel lossless current sensing method in multiphase DC-DC converters with coupled inductors is proposed. With this novel method, the additional loss is saved and the efficiency...
Published: 9/3/2012   |   Inventor(s): Yan Dong, Ming Xu, Fred Lee
Keywords(s):  
Category(s): Electrical
Coupled-Inductor Technique for Multi-phase VRs
Coupling the output indictors of the multi-phase Buck can reduce the steady-state current ripple while maintaining the same transient response. The conduction losses in the switches can thus be reduced. The air gap in the center leg more evenly distributes the flux, which can reduce the core loss in the center leg. Furthermore, using coupled inductor...
Published: 9/3/2012   |   Inventor(s): Jinghai Zhou, Fred Lee, Ming Xu, Yan Dong
Keywords(s): Electronics
Category(s): Electrical