Results 81 to 90 of about 452,796 (315)

Design of a kilowatt DC-DC converter

MATEC Web of Conferences, 2017
In view of the low power of traditional DC-DC converters, a DC-DC converter with a kilowatt power is designed. The input signal's frequency is 1 kHz and the duty cycle is 5%. The PWM signal controls the high-speed conduction or cut-off of the switch tube.
Liu Hongxing, Fu Chenwei, Li Na, Alexey Soldatov, Han Wei   +4 more
doaj   +1 more source

Copper Doping Enhances the Activity and Selectivity of Atomically Precise Ag44 Nanoclusters for Photocatalytic CO2 Reduction

Advanced Functional Materials, EarlyView.
By a simple anti‐Galvanic reaction, up to six copper atoms could be preferably doped into the Ag2(SR)5 staple motifs and Ag20 dodecahedral shell of an atomically precise Ag44(SR)30 nanocluster. When anatase TiO2 is used as substrate, the (AgCu)44/TiO2 photocatalyst exhibited much improved activity in photocatalytic CO2 reduction compared to Ag44/TiO2 ...
Ye Liu, Xi Zheng, Xiufan Liu, Tengyuan Gao, Nicola Pinna, Yu Wang   +5 more
wiley   +1 more source

An improved coupled inductor‐based quadratic step‐up DC–DC converter with a high step‐up factor and reduced voltage overshoot on the power switch

IET Power Electronics
Most coupled inductor‐based step‐up DC–DC converters encounter a significant voltage overshoot on their power switch due to the leakage inductance of the coupled inductor.
Mahnaz Izadi, Ali Mosallanejad, Alireza Lahooti Eshkevari   +2 more
doaj   +1 more source

A study of Schwarz converters for nuclear powered spacecraft [PDF]

High power space systems which use low dc voltage, high current sources such as thermoelectric generators, will most likely require high voltage conversion for transmission purposes.
Schwarze, Gene E., Stuart, Thomas A.
core   +1 more source

Prospects of Electric Field Control in Perpendicular Magnetic Tunnel Junctions and Emerging 2D Spintronics for Ultralow Energy Memory and Logic Devices

Advanced Functional Materials, EarlyView.
Electric control of magnetic tunnel junctions offers a path to drastically reduce the energy requirements of the device. Electric field control of magnetization can be realized in a multitude of ways. These mechanisms can be integrated into existing spintronic devices to further reduce the operational energy.
Will Echtenkamp, Brahmdutta Dixit, Yifei Yang, Deyuan Lyu, Thomas Peterson, Qi Jia, Yu‐Chia Chen, Jian‐Ping Wang   +7 more
wiley   +1 more source

Systematic Review of the Design Process for LLC Resonant Converters: Modelling, Voltage Gain Range, and Efficiency Optimization

IET Power Electronics
The proliferation of power conversion requirements in renewable energy systems and rail transit systems demands LLC resonant converters with enhanced voltage adaptability and efficiency.
Xia Peng, Wei Li, Qi Liu, Tiantian Liu, Gaofeng Liu, Wai Tung Ng   +5 more
doaj   +1 more source

Analysis of a Mars-stationary orbiting microwave power transmission system [PDF]

To determine the feasibility of providing efficient RF power transmission from a Mars-stationary orbit to the surface of the planet, an assessment was made focussing on RF propagation in the 2.45- to 300-GHz range.
Long, Kenwyn J.
core   +1 more source

Modular input-parallel output-series DC/DC converter control with fault detection and redundancy [PDF]

, 2016
Large offshore wind farms require extensi ve sub-sea cables within the collection network. Present solutions are based aro und medium-voltage AC collection networks.
Adam, G.P., Finney, S.J., Holliday, D., Lian, Y.   +3 more
core   +1 more source

Reconfigurable Three‐Dimensional Superconducting Nanoarchitectures

Advanced Functional Materials, EarlyView.
3D superconducting nanostructures offer new possibilities for emergent physical phenomena. However, fabricating complex geometries remains challenging. Here 3D nanoprinting of complex 3D superconducting nanoarchitectures is established. As well as propagating superconducting vortices in 3D, anisotropic superconducting properties with geometric ...
Elina Zhakina, Luke Alexander Turnbull, Weijie Xu, Markus König, Paul Simon, Wilder Carrillo‐Cabrera, Amalio Fernández‐Pacheco, Uri Vool, Dieter Suess, Claas Abert, Vladimir M. Fomin, Claire Donnelly   +11 more
wiley   +1 more source

High voltage systems (tube-type microwave)/low voltage system (solid-state microwave) power distribution [PDF]

, 1980
SPS satellite power distribution systems are described. The reference Satellite Power System (SPS) concept utilizes high-voltage klystrons to convert the onboard satellite power from dc to RF for transmission to the ground receiving station.
Nussberger, A. A., Woodcock, G. R.
core   +1 more source