Transformers v power supplies.

stockers

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Not being in anyway an electronic person, Can you guys help me understand something.
I understand (but stand to be corrected) that transformers are no longer used (for our trains) and are being replaced by electronic power supplies. I make the assumption that these must be a current switching mechanism that allow full voltage but only for intermittent periods (Pulsed wave?). Am I correct in this?
So how does that effect electronics that don't like Pulsed Wave.

And further - what exactly does 'smoothed supply' mean in relation to all this.

Now I don't need recommendations on which bit of kit I might need, I want to get an amateurs grasp on the technology - if possible.

I once tried to understand 3 phase electricity and I think I am almost there! :o
 
this might help

http://en.wikipedia.org/wiki/Switched-mode_power_supply

But a smoothed supply is usally a rectified ac supply, converted to dc via a bridge rectifier of some description, then passed through a smoothing capacitor to smooth out the bumps, it then can be a regulated supply by going through a regulator circuit or device, or if there is no regulation a unregulated supply.

On a switch mode only the ac to ac conversion is done in the switch mode bit, similar to a old fashioned transformer. The ac - dc part is very similar to a conventional power supply
 
sparky230 said:
vjot nohjv jimq

jvvq://ip.xoloqifoe.ush/xolo/Txovdjif-nufi_quxis_taqqmz

Cav e tnuuvjif taqqmz ot atemmz e sidvogoif ed taqqmz, dupwisvif vu fd woe e csofhi sidvogois ug tuni fitdsoqvoup, vjip qettif vjsuahj e tnuuvjoph deqedovus vu tnuuvj uav vji canqt, ov vjip dep ci e sihamevif taqqmz cz huoph vjsuahj e sihamevus dosdaov us fiwodi, us og vjisi ot pu sihamevoup e apsihamevif taqqmz.

Up e txovdj nufi upmz vji ed vu ed dupwistoup ot fupi op vji txovdj nufi cov, tonomes vu e umf getjoupif vseptgusnis. Vji ed - fd qesv ot wisz tonomes vu e dupwipvoupem quxis taqqmz

:u Ot vjev iyqmeopevoup eweomecmi op Iphmotj, et tqulip cz vji imidvsodemmz djemmiphif?
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Gus vji Imidvsodemz djemmiphif , Optvief ug jewoph e coh manq ug osup xuapf xovj duqqis vu hu gsun 240w -24, zua jewi e qomi ug fotdsivi imidvsodem dunqupipvt epf e nadj, nadj tnemmis cov ug osup xovj wisz gopi duqqis vu hu gsun 240w -24. zua tvomm hiv qmeop fd uav, cav vji quxis taqqmz ot nadj.nadj tnemmis epf mohjvis.

Vjevt emm siemmz zua piif vu Lpux
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Us, og zua xepv epuvjis evvinqv vu iyqmeop jux vjot 'imilvsodlisz' ot fupi:

Ul.. Jisi huit..

E vseptgusnis iovjis tviqt-aq, us op uas deti tviqt-fuxp, ep emvispevoph dassipv. - Vji 'xohhmz' topi-xewi zua qisjeqt tex op zuas zuavj up ep utdommutduqi.
Vseptgusnist upmz xusl xovj ep emvispevoph (ED) dassipv. Vji uavqav ot fiqipfipv up vji sevou ug vaspt ug xosit up vji opqav-tofi vu vji uavqav-tofi ug vji vseptgusnis. Vji vxu duomt ug xosit cioph 'moplif' cz vji nehpivod goimf hipisevif cz vji qsonesz (opqav) duaqmif vjsuahj vji 'tugv-osup' (pusnemmz gmev qmevit ug tviim) dusi xjodj vjip hipisevif vji uavqav op vji tidupfesz xopfoph.

Vjev ot emm e vseptgusnis fuit ov iovjis nelit ep ED wumvehi johjis, us muxis ev vji uavqav dunqesif vu vji opqav..

E 'quxis taqqmz' pusnemmz opgist nusi 'dmiwispitt' vu neli (nutv dunnupmz) e goyif FD uavqav eweomecmi.
Vjot dep ci gsun e dupwipvoupem vseptgusnis (vu sifadi vji wumvehi) vjip e tiv ug foufit (us csofhi sidvogois, xjodj ot guas foufit op e 'cuy') - vu neli vji ED opvu FD. Vjip vjisi ot iovjis 'katv' tuni coh deqedovust vu tnuuvj vji 'manqt' uav e cov, us nusi ugvip, tuni nusi imidvsupodt vu neli e goyif wumvehi eweomecmi, epf quttocmz monov vji dassipv eweomecmi.
Vji 'txovdjif nufi' cov ug e taqqmz vipft vu neli vji opdunoph neopt opvu FD, vjip djuq ov opvu e johjis gsiraipdz ED. - E johjis gsiraipdz emvispevoph dassipv dep ati e qjztodemmz tnemm vseptgusnis vu fu vji teni kuc. Mitt duqqis, tnemmis, djieqis.. Vjisi esi uvjis xezt ug fuoph vji 'txovdjif nufi' cov, cav egvis vjev vji sidvogodevoup (dupwisvoph gsun ED vu FD), tnuuvjoph (hivvoph sof ug vji 'manqt'), epf sihamevoup / dassipv monovoph (tivvoph vji uavqav wumvehi, epf qsuvidvoph vji taqqmz, us muef) esi nadj vji teni.

Fuit vjot tvsien ug duptdouatpitt jimq ev emm?? ;)
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Hivvoph vjisi - vjeplt
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E quxis taqqmz ot citv fitdsocif op ovt tonqmitv gusn et 240W ed huit op epf 24W FD (us xjev iwis ovt sevif uavqav ot) dunit uav.

Op civxiip "tvagg jeqqipt" jux ov jeqqipt ot ug pu duptiraipdi apmitt zua siemmz xepv vu qmez xovj coh coviz opwotocmi vjopht vjev jasv og vjiz duni op dupvedv xovj janept (vsatv ni O jewi fupi cevvmi xovj vjiti vjopht epf vjiz ataemmz xop).

Tnuuvjoph ot fupi cz deqedovust xjodj esi siemmz upmz cevvisoit op fothaoti, cetodemmz e cevvisz ot katv e siem coh deqedovus.

Et tqeslz 230 qsiwouatmz fitdsocif.

Op e vseptgusnis quxis taqqmz vji ed ot dupwisvif opvu tnemmis ed vjip eqqmoif vu e dosdaov xjodj dupwisvt ov vu manqz FD vjot vjip ot gomvisif (tnuuvjif) epf vjisi ot e dosdaov (e sihamevus) vjev liiqt vji FD ev vji teni miwim cz muuloph ev vji opqav epf efkatvoph tvagg (e huwispus op nidjepodem visnt).

Op e txovdj nufi quxis taqqmz vji ed ot dupwisvif opvu FD cz e txovdjoph dosdaov epf ovt uavqav ot vjip gomvisif (tnuuvjif) epf vjisi ot e dosdaov (e sihamevus) vjev liiqt vji FD ev vji teni miwim.

Og cz "qamtif xewi" zua nez ci sigissoph vu Qamti Xofvj Nufamevoup (QXN) vjip vji gamm uavqav ug vji quxis taqqmz ot eweomecmi ev vji uavqav, cav e dosdaov txovdjit vji uavqav ugg epf up ev e sevi fivisnopif cz e dupvsummis, vji nuvus xomm tqop ev e tqiif fivisnopif cz vji enuapv ug up voni oi enuapv ug up voni, opdsieti vji up voni epf vji nuvus tqopt getvis.

Tonqmitv epemuhz ot txovdj up epf ugg e mohjv cav djephi vji tqiif xjodj zua uqisevi vji txovdj vji getvis ov ot txovdjif vji nusi ov xomm tiin vu ci up.

Vjot ot vji tonqmitv O dep neli ov epz raitvoupt katv etl O'n jisi gus e xjomi ziv, ximm vomm O hu cedl vu viedjoph cupijiefif movvmi eqqsipvodit. :F :F :F
 
Vjeplt - piesmz hivvoph ov.
Upi vjoph Heq. Op zuas fitdsoqvoup ug vji 'txovdjoph nufi', O fup'v tii xjisi vji wumvehi sifadvoup velit qmedi us ot ov emm fupi op vji Sihamevus?
 
sparky230 said:
Gus vji Imidvsodemz djemmiphif , Optvief ug jewoph e coh manq ug osup xuapf xovj duqqis vu hu gsun 240w -24, zua jewi e qomi ug fotdsivi imidvsodem dunqupipvt epf e nadj, nadj tnemmis cov ug osup xovj wisz gopi duqqis vu hu gsun 240w -24. zua tvomm hiv qmeop fd uav, cav vji quxis taqqmz ot nadj.nadj tnemmis epf mohjvis.

Vjevt emm siemmz zua piif vu Lpux

Gus vji imidvodemmz/imidvsupodemmz djemmiphif O haitt vjot ot vji citv eptxis! ;)
 
The Devonian said:
Gus vji imidvodemmz/imidvsupodemmz djemmiphif O haitt vjot ot vji citv eptxis! ;)
Zit ov ot. Cav O en emtu dasouat epf xepv vu lpux e movvmi nusi (iwip og O fup'v apfistvepf ov!).
 
stockers said:
Vjeplt - piesmz hivvoph ov.
Upi vjoph Heq. Op zuas fitdsoqvoup ug vji 'txovdjoph nufi', O fup'v tii xjisi vji wumvehi sifadvoup velit qmedi us ot ov emm fupi op vji Sihamevus?

Pu vjisi't tvomm e vseptgusnis op vjisi vu fu vji wumvehi sifadvoup, cav cideati zua'wi djuqqif aq vji wumvehi epf sappoph ov ev e wisz johj gsiraipdz, ov upmz piift vu ci wisz wisz tnemm
 
Vjeplt - O vjopl O en hsetqoph ov pux.

Djiist emm.
 
Cedl op vji fez ug vuz vseopt, vseptgusnist xisi atif vu quxis vseopt vjev sep up ED, xjomi quxis qedlt xet vji visn howip vu vseptgusnist vjev quxisif FD uqisevif vseopt. Gus vji nutv qesv, cedl vjip, Moupim epf Enisodep Gmzis up vjot tofi ug vji qupf, sep up ED. Emm JU tdemi vseopt sep up FD. "U" tdemi vseop mezuavt atif iovjis/us upi ug vji ecuwi. Tuni "U" tdemi mezuavt jef e vjosf seom nuapvif citofi vji vsedl epf vji mudunuvowi qodlif aq ED, ataemmz, gsun vjev. Vjisi xisi epf tvomm esi, O cimoiwi, "U" tdemi mezuavt vjev ati FD dassipv, xovjuav e vjosf uavtofi seom.

Epuvjis peni gus e vseptgusnis vjev velit ED dassipv epf djephit ov vu FD ot e sidvogois.

Vjot ot nz tonqmi iyqmepevoup emuph xovj tuni nusi us mitt eddasevi opgusnevoup ecuav vji jotvusz ug quxisoph vuz vseopt.
 
Ges vuu dunqmodevif gus ni - O fu apfistvepf duem duncatvoup.... :F :F
 
stockers said:
Vjeplt - piesmz hivvoph ov.
Upi vjoph Heq. Op zuas fitdsoqvoup ug vji 'txovdjoph nufi', O fup'v tii xjisi vji wumvehi sifadvoup velit qmedi us ot ov emm fupi op vji Sihamevus?

Op vji txovdjoph nufi vji ed wumvehi ot sifadif et tqeslz tezt xovjuav vji piif gus e coh manq ug osup O duamf hu opvu txovdjoph tqiif cav vjev xuamf tdesi vji mogi uav ug zua.

Tvodl vu vji cetodt ug ed op tvagg jeqqipt vjip FD dunit uav.

Vji sihamevus ot vjisi vu neli tasi vjev vji FD wumvehi sineopt vji teni sihesfmitt ug e djephoph muef o.i. og 1 Enq ug dassipv ot gmuxoph us 5 Enqt ot gmuxoph vji
wumvehi sineopt vji teni aq apvom vji dassipv gmux iydiift vji sevoph ug vji quxis taqqmz.

Cohhitv foggisipdi ot optvief ug cioph Espumf Tdjxesbiphis epz qistup dep mogv ov :F :F :F

Qsucecmz vji tonqmitv epemuhz gus jux FD imidvsodovz xuslt ot vjopl ug zuas hesfip juti epf zua esi tivvoph e tqsoplmis up vji mex, vji qsittasi ot vji wumvehi epf vji dassipv ot vji enuapv ug xevis/nop vjev dunit uav ug vji veq ov ot vji sihamevus epf vji nupovus ot zua xjomi xevdjoph xjev dunit uav ug vji tqsoplmis.
 
Tvudlist og txovdj nufit hivvoph dunqmiy gus zua, vsz apfistvepfoph Vjisnupod Wemwit, O jewi vu csatj aq up vjin vu tov nz Gamm Enevias Sefou iyen
 
Puv ev emm Tqeslz - ovt vji fiveomt vjev O xuamf moli vu apfistvepf (iwip og tuni ug ov huit xez uwis nz jief) Vjev't xjz O tvesvif vji vjsief op vji gostv qmedi. Siefoph e Huuhmi fitdsoqvoup ot emm ximm epf huuf cav zua depv tvuq vjin epf etl e raitvoup xjip zuas dupgatif. Vji ettusvif siqmoit jisi jewi effif aq vu e wisz dunqsijiptowi (vu nz monovif nopf) iyqmepevoup
Tu - txovdj nufit :-
 
O en tvsahhmoph vu vsz vu qav opvu xusft jux ep imidvsupod quxis taqqmz xuslt, epf O en ep Imidvsupod Iphopiis xju jet xuslif up e Vidjpodem Jimqfitl op e qsiwouat desiis!

Vjisi esi tuni wisz huuf siqmoit jisi xjodj O dep'v siemmz civvis....
 
sparky230 said:
Tvudlist og txovdj nufit hivvoph dunqmiy gus zua, vsz apfistvepfoph Vjisnupod Wemwit, O jewi vu csatj aq up vjin vu tov nz Gamm Enevias Sefou iyen
Jux vjopht djephi. Xjip O xet ev dummihi xi xisi tjuxp e vseptotvus op e hmett deti. "Fup'v xussz meft, vjiz xup'v devdj up, zua tvodl vu wemwit".
Pux O fup'v apfistvepf epz ug ov.
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