Effect of the Selection of Input Voltage and Maximum Operating Flux Density of Different Core Material on the Optimum Design of Switching Power Converter

1983 ◽  
Vol IA-19 (2) ◽  
pp. 250-254 ◽  
Author(s):  
Ching J. Wu
Keyword(s):  
Flux Density ◽  
Optimum Design ◽  
Input Voltage ◽  
Power Converter ◽  
Core Material ◽  
Switching Power ◽  
Selection Of

scholarly journals Selection of Inductor and Snubber Capactor to Optimize the Size and Efficiency of DC-DC Switching Power Converter

2018 ◽  
Vol 7 (1) ◽  
pp. 49-52
Author(s):  
N. M. Mahesh Gowda ◽  
S. S. Parthasarathy
Keyword(s):  
Power Converter ◽  
Maximum Efficiency ◽  
Transistor Switch ◽  
Switching Power ◽  
Turn On ◽  
Resonant Transition ◽  
Gate Signal ◽  
Zero Voltage ◽  
Conduction Mode ◽  
Selection Of

This paper presents a selection of inductor and snubber capacitor in non-isolated synchronous DC-DC switching power converter. The circuit is made to operate in Synchronous Discontinuous Conduction Mode (SDCM)/Forced Continuous Conduction Mode (FCCM) of operation for minimum inductor value, to reduce the size, weight and cost of the converter. The turn off loss of the switch induced by SDCM of operation is minimized by connecting snubber capacitor across the transistor switch. Before the switch is turned ON, snubber capacitor requires certain amount of energy must be stored in the inductor to discharge the capacitor energy [1]. The question is how much capacitor and inductor value is required. A series of MATLAB script are executed to find minimum inductor value for FCCM of operation and to select snubber capacitor for maximum efficiency. Complementary gate signals are used to control the ON and OFF of main and auxiliary switch. SDCM of operation due to complementary control gate signal scheme, minimum turn on loss of the transistor switch and low diode reverse recovery loss are achieved. Thus the Zero Voltage Resonant Transition (ZVRT) of transistor switch is realized, both turn on and turn off loss is minimized and also removes the parasitic ringing in inductor current.

scholarly journals Selection of Optimal Magnets for Traction Motors to Prevent Demagnetization

Machines ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 124
Author(s):  
Dantam Rao ◽  
Madhan Bagianathan
Keyword(s):  
Flux Density ◽  
Electric Vehicles ◽  
Parallel Line ◽  
Low Grade ◽  
Lower Grade ◽  
Worst Case ◽  
Traction Motors ◽  
Knee Point ◽  
Point Of Intersection ◽  
Selection Of

Currently, permanent-magnet-type traction motors drive most electric vehicles. However, the potential demagnetization of magnets in these motors limits the performance of an electric vehicle. It is well known that during severe duty, the magnets are demagnetized if they operate beyond a ‘knee point’ in the B(H) curve. We show herein that the classic knee point definition can degrade a magnet by up to 4 grades. To prevent consequent excessive loss in performance, this paper defines the knee point k as the point of intersection of the B(H) curve and a parallel line that limits the reduction in its residual flux density to 1%. We show that operating above such a knee point will not be demagnetizing the magnets. It will also prevent a magnet from degenerating to a lower grade. The flux density at such a knee point, termed demag flux density, characterizes the onset of demagnetization. It rightly reflects the value of a magnet, so can be used as a basis to price the magnets. Including such knee points in the purchase specifications also helps avoid the penalty of getting the performance of a low-grade magnet out of a high-grade magnet. It also facilitates an accurate demagnetization analysis of traction motors in the worst-case conditions.

Stability analysis of digital feedback gain changeable control switching power converter

2016 ◽  
Author(s):  
Kazuhiro Kajiwara ◽  
Hidenobu Tajima ◽  
Hidenori Maruta ◽  
Tadashi Suetsugu ◽  
Fujio Kurokawa ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Power Converter ◽  
Feedback Gain ◽  
Switching Power

Mechanical Properties and Mineralogical Composition of Potash Ore as a Factor in Selecting the Processing Method

2021 ◽  
Vol 1022 ◽  
pp. 17-26
Author(s):  
Yana V. Kuskova ◽  
Nikita A. Lipnitsky
Keyword(s):  
Mechanical Properties ◽  
Mining Industry ◽  
Mineralogical Composition ◽  
Core Material ◽  
Correct Selection ◽  
Dry Cleaning ◽  
Size And Shape ◽  
Natural Size ◽  
Selection Of ◽  
Intergranular Space

The correct selection of technology for processing potash ore depends on its mineralogical composition, the natural size and shape of grains, as well as on the amount and size of halite grains located in the intergranular space of sylvinites. The study of seams and mineralogical and petrographic studies of potash ore were carried out in order to determine the natural size of sylvinite grains, their shape, and the content of halite in the intergranular space.Moreover, the influence of these parameters on the beneficiation ability of the ore using dry cleaning process was determined. In addition, the data on laboratory studies using electric separation is provided in the paper. The results of the provided studies can be used by specialists of the mining industry when considering the influence of the mineral composition, size and shape of grains of potash ore in order to select the separation method at the early stages of development of potash deposits. The study of core material and mechanical properties, mineralogical and petrographic studies together with studies on beneficiation ability of ore presented in the article can be used, for example, in the preparation of a feasibility report.

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