A Study of Different Possible Switched Mode Chopper Circuits for Multi-Magnet Based DC Electromagnetic Levitation System
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78 citations
"A Study of Different Possible Switc..." refers background or methods in this paper
...Thispaper reports control ofan electro magnetically levitated platform (vehicle structure) [ 6 ]that usesfour attraction typemagnets fixed atthefour corners oftheplatform....
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...topology (Fig. 6 ), itmaymakesense toinvest onanother simple circuit tocontrol thedumpcapacitor voltage within desired limits ortofeed backthis energy toinput supply....
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...Instead ofthispowercircuit topology, ifthe simplified circuit (Fig. 6 ) withonlyoneswitch (anda diode withenergy-dump circuit) permagnet isused, the overall saving inthepoweramplifier components maybe significant....
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...Thecommonsource point canbedirectly connected tothecontrol ground andgate driveisolation isnota musthere.Fig.7 showsa modification overthecircuit ofFig. 6 tokeepthe capacitor voltage magnitude undercontrol andnearly ripple free....
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...Ineachcasethecurrent of theelectromagnet iscontrolled through asingle switch based DC toDC switched modechopper circuit (Fig. 6 ) utilizing anouterposition control loopandaninner current feedback control loopasshownintheblock diagram ofFig. 1.A leadcompensator [8]isusedin cascade withtheposition control loopformaintaining overall closed loopstability....
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72 citations
"A Study of Different Possible Switc..." refers background or methods in this paper
...Based on the basic principle, magnetic levitation may broadly be classified into two types, electrodynamic levitation and electromagnetic levitation [1-2]....
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...In contrast, the explicit DC method, technically known as the DC electromagnetic levitation system (EMLS) [1-3], has a considerably simpler configuration with favourable power requirement....
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...The expected variation in the magnet demand current (small signal component), over its nominal DC value, is expected to be band limited to around 10 Hz but it is better to have a current tracking capability in the range of up to 100 Hz [1]....
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...In electromagnetic levitation (attraction system), the electromagnets are driven either by AC or DC source [1-2]....
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34 citations
"A Study of Different Possible Switc..." refers background in this paper
...Fig. 4 Asymmetrical bridge (H-bridge) converter circuit...
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...Theasymmetrical bridge circuit showninFig. 4 ...
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