Maximum Efficiency Average Current Controller Based on A Comprehensive Charge Rate Model for DCM Boost PFC Converter

2020 ◽  
pp. 1-1
Author(s):  
Linkai Li ◽  
Wanyang Wang ◽  
Dian Lyu ◽  
Run Min ◽  
Qiaoling Tong ◽  
...  
Keyword(s):  
Maximum Efficiency ◽  
Rate Model ◽  
Current Controller ◽  
Charge Rate ◽  
Average Current ◽  
Boost Pfc Converter

Highly accurate average current controller using charge sharing method for LED lamp driver

2018 ◽  
Vol 54 (7) ◽  
pp. 439-441
Author(s):  
H.‐A Ahn ◽  
S.‐K. Hong ◽  
O.‐K. Kwon
Keyword(s):  
Charge Sharing ◽  
Current Controller ◽  
Average Current

An Investigation Into the Impact of the Performance Efficiency of PEM Fuel Cells From Coupling Channel Dimensions With Flow Configurations

2006 ◽  
Author(s):  
Manish Jindal ◽  
Mark Archambault
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Mass Flow ◽  
Current Density ◽  
Operating Conditions ◽  
Maximum Efficiency ◽  
Average Current Density ◽  
Average Current ◽  
Flow Directions ◽  
Relative Flow

Proton Exchange Membrane fuel cells are receiving a great deal of attention due to their low-temperature characteristics and environmental friendliness. Significant research has been conducted towards understanding and perfecting these devices so as to realize their potential to produce power with maximum efficiency and minimum cost. While much work has been done to refine the electrochemical and mass transport models describing the physics of the cell in the vicinity of the catalyst and membrane layers, comparatively little attention has been paid to the fluid dynamics phenomena within the cell and how it impacts the efficiency and performance of the device. The purpose of this work is to combine a subset of previously reported results and determine whether they can be incorporated into a single PEM fuel cell to further increase the performance above and beyond the increase obtained by implementing them separately. Several three-dimensional models with varying channel shapes, relative flow directions, and operating conditions were developed. Various inlet flow distributions were imposed to evaluate the most efficient fuel cell configuration. Results show that there are only minor differences in the average current density of the fuel cell with changes in the channel cross-sectional shape. Moreover, there is little impact on performance with variations in the relative flow directions of the inlet gases. While only slight increases in fuel cell performance were observed with most mass flow rate distributions across the channels, alternating high and low mass flow rates in adjacent channels provided almost a 3% increase in average current density over a uniform profile.

Electrolytic Isolation of Twin-Type Shock Deformation Structures

1967 ◽  
Vol 25 ◽  
pp. 318-319
Author(s):  
F. I. Grace ◽  
L. E. Murr
Keyword(s):  
Grain Boundaries ◽  
Thin Foil ◽  
Electrolyte Composition ◽  
Experimental Conditions ◽  
Average Current Density ◽  
Electron Transmission ◽  
Deformation Structures ◽  
The Matrix ◽  
Average Current ◽  
Specimen Edge

During the course of electron transmission investigations of the deformation structures associated with shock-loaded thin foil specimens of 70/30 brass, it was observed that in a number of instances preferential etching occurred along grain boundaries; and that the degree of etching appeared to depend upon the various experimental conditions prevailing during electropolishing. These included the electrolyte composition, the average current density, and the temperature in the vicinity of the specimen. In the specific case of 70/30 brass shock-loaded at pressures in the range 200-400 kilobars, the predominant mode of deformation was observed to be twin-type faults which in several cases exhibited preferential etching similar to that observed along grain boundaries. A novel feature of this particular phenomenon was that in certain cases, especially for twins located in the vicinity of the specimen edge, the etching or preferential electropolishing literally isolated these structures from the matrix.

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