Results 81 to 90 of about 21,721 (309)

A review on flicker-free ac-dc LED drivers for single-phase and three-phase ac power grids [PDF]

, 2019
Light-Emitting Diodes (LEDs) are coming strongly into the lighting market due to their advantages over conventional lighting solutions: energy efficient, controllable in both light and color, long lifetime, lack of a warm-up period and high power density.
Arias Pérez de Azpeitia, Manuel, Castro Álvarez, Ignacio, González Lamar, Diego, Hernando Álvarez, Marta María, Sebastián Zúñiga, Francisco Javier, Vázquez Ardura, Aitor   +5 more
core   +2 more sources

CO2 Reduction on Copper‐Nitrogen‐Doped Carbon Catalysts Tuned by Pulsed Potential Electrolysis: Effect of Pulse Potential

Advanced Functional Materials, EarlyView.
This study demonstrates that pulsed potential electrolysis significantly improves CO2 reduction performance on copper‐nitrogen doped carbon electrodes. The formation of cationic copper sites and metallic clusters as a function of applied intermittent potential leads to notable selectivity changes compared to potentiostatic reduction.
Dorottya Hursán, Janis Timoshenko, Andrea Martini, Hyo Sang Jeon, Eduardo Ortega, Martina Rüscher, Arno Bergmann, Aram Yoon, Uta Hejral, Antonia Herzog, Clara Rettenmaier, Felix T. Haase, Philipp Grosse, Beatriz Roldan Cuenya   +13 more
wiley   +1 more source

A Generalized Active Voltage Balancing Circuit Implementation for Flying Capacitor 3-Level Switching-Mode DC–DC Converters

IEEE Open Journal of Circuits and Systems
This paper presents a generalized control architecture for implementing the active balancing of the flying capacitor voltage in any kind of 3-level switching-mode DC-DC converters, independently from the desired conversion ratio or targeted output power ...
Elisabetta Moisello, Samuele Fusetto, Piero Malcovati, Edoardo Bonizzoni   +3 more
doaj   +1 more source

Modular Multilevel Converter for Electric Motor Drive Applications [PDF]

, 2015
In this master thesis the topic of Modular Multilevel Converters (MMC) has been studied. The working principle of the converter is presented with advantageous attributes such as a multilevel waveform, a modular realization and cost saving features. Vital
Ekern, Bertil Lassesen
core  

Photoswitching Conduction in Framework Materials

Advanced Functional Materials, EarlyView.
This mini‐review summarizes recent advances in state‐of‐the‐art proton and electron conduction in framework materials that can be remotely and reversibly switched on and off by light. It discusses the various photoswitching conduction mechanisms and the strategies employed to enhance photoswitched conductivity.
Helmy Pacheco Hernandez, Stefan Hecht, Wolfgang Wenzel, Lars Heinke, Mariana Kozlowska   +4 more
wiley   +1 more source

Overview of three-phase inverter topologies for distributed generation purposes [PDF]

, 2010
The increasing presence of single-phase distributed generators and unbalanced loads in the electric power system may lead to unbalance of the three phase voltages, resulting in increased losses and heating.
De Kooning, Jeroen, Degroote, Lieven, Meersman, Bart, Renders, Bert, Vandevelde, Lieven, Vandoorn, Tine   +5 more
core   +1 more source

Dynamic Control of Synaptic Plasticity by Competing Ferroelectric and Trap‐Assisted Switching in IGZO Transistors with Al2O3/HfO2 Dielectrics

Advanced Functional Materials, EarlyView.
A frequency‐tunable ferroelectric synaptic transistor based on a buried‐gate InGaZnO channel and Al2O3/HfO2 dielectric stack exhibits linear and reversible weight updates using single‐polarity pulses. By switching between ferroelectric and trap‐assisted modes depending on input frequency, the device simplifies neuromorphic circuit design and achieves ...
Ojun Kwon, Dong Ho Lee, Seyoung Oh, Jongwon Yoon, Hyo‐Bae Kim, Ji‐Hoon Ahn, Woojin Park, Han Seul Kim, Byungjin Cho   +8 more
wiley   +1 more source

Adaptive Balancing of Series-Connected SiC MOSFETs Based on Active Clamping and Comparison Circuitry

IEEE Access
This paper proposes a control method for balancing the voltages of series-connected SiC MOSFETs based on active clamping and comparison circuitry. Each SiC MOSFET is paired with an active clamping module (ACM), which comprises an auxiliary switch and a ...
Shuai Shao, Wentao Cui, Yibo Jiang, Xingyu Pei, Junming Zhang   +4 more
doaj   +1 more source

Multi-Vector Model Predictive Control for Three-Phase Four-Switch Rectifier with Capacitor Voltage Balancing

Zhongguo dianli, 2019
Three-phase four-switch rectifier has the problem of unbalanced capacitor voltage because one phase of its AC side is directly connected between two capacitor neutral points on the DC side.
Baoge ZHANG, Weijie MA
doaj   +1 more source

A minimum-energy-based capacitor voltage balancing control strategy for MPC conversion systems [PDF]

ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465), 2003
In AC/DC/AC power conversion, the connection of a multi point clamped (MPC) rectifier with an MPC inverter simplifies the balancing of the voltages on the series-connected DC link capacitors as well as giving input power-factor correction capability. This is only true provided that an alternative balancing PWM control strategy is adopted instead of the
MARCHESONI, MARIO, MAZZUCCHELLI, MAURIZIO FRANCO, F. V. P. ROBINSON, P. TENCA   +3 more
openaire   +2 more sources