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Symmetrical AC Laboratory

mirley, May 26, 2011 - 21:46

Projects

Power Supplies

9.5Rati!: "oe #$era!e: 9.5 %4 $oters&

'(e system is t(e most or)iary re!ulate) power supply *uilt o +uite ol) alrea)y sta*ilieru#2. Same *oar) )esi! was create) a lo! time a!o *ut oly ow is t(e time to start a

w(ole. '(e power supply pro$i)es a symmetrical output $olta!e a) curret to .-26/ #.cee)i! t(e maimum curret will cut output trasistors, w(ic( ca *e re!ar)e) as o$ercurret protectio. irect re!ulatio is su*ject to a positi$e $olta!e, a) t(e e!ati$e part3ollows *u)owaemu positi$e t(as to t(e system o t(e ampli3ier '01. Most o3 t(esystems is powere) *y a si!le, *ut as (e realie) alrea)y se$eral times, i e$ery wors(ops(oul) *e iclu)e), suc( a arra!emet. '(is is especially use3ul w(e aalo! )esi!s usi!operatioal ampli3iers, or to pre-ru power ampli3iers. '(e a)$ata!e o3 t(e structure )escri*e)(ere is $ery low cost, w(ic( represets 907 o3 t(e power tras3ormer. #3ter completi! t(epower supply circuits 3or $olta!e a) curret measuremet, )escri*e) t(e power supply will

*ecome $ery serious la*oratory istrumet.

Action:

Sc(ematic )ia!ram o3 t(e system is t(e )ia!ram *elow:

http://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/lab_zasilacz_symetryczny&usg=ALkJrhj4nlraTbaC05q1iK-G7PQlNW9dYAhttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/projekty&usg=ALkJrhjuLd0LnEsrjBAkhtNZ6DGP44_khghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/projekty&usg=ALkJrhjuLd0LnEsrjBAkhtNZ6DGP44_khghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/zasilacze&usg=ALkJrhh5FXNDxpjJA7nTAB9bmLwSpJWyVghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/projekty&usg=ALkJrhjuLd0LnEsrjBAkhtNZ6DGP44_khghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/zasilacze&usg=ALkJrhh5FXNDxpjJA7nTAB9bmLwSpJWyVghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/lab_zasilacz_symetryczny&usg=ALkJrhj4nlraTbaC05q1iK-G7PQlNW9dYA

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'(e system is a sta*ilier U1%u#2&, w(ic( is a precisio $olta!e re!ulator circuit. '(esystem iclu)es a temperature compesate) re3erece $olta!e source, a error ampli3ier a) t(e

output trasistor t(at allows curret to 3low to 150m#. U1is wori! i a typical co3i!uratioi w(ic( t(e iteral error ampli3ier compares t(e $olta!e )i$i)er R0%5,6& - R3%4,& w(ic(pre$ails wit( t(e $olta!e at t(e output o3 t(e power supply. Resistors R4%220R& a) R5%6,&a) potetiometer P1%50& supply to t(e i$erti! iput o3 error ampli3ier U1respecti$e3ractio o3 t(e output $olta!e %c(oice o3 )i$i)er elemets )epe)i! o t(e output $olta!e will*e )escri*e) i t(e c(apter 8uil)i!8&. # error ampli3ier operati! i a e!ati$e 3ee)*acloop a)justs *y meas o3 R1 %560R&, '1 %911&, a) '2 %19& output $olta!e so t(at t(e3ractio is e+ual to t(e $olta!e )i$i)er ustalemu R0 - R. (a!i! t(e positio o3 t(e sli)erwill c(a!e t(e P1 3ractio o3 t(e output $olta!e, so t(e error ampli3ier output $olta!e $ariesaccor)i!ly to compesate 3or t(is c(a!e. ;or eample, i t(e )irectio o3 turi! t(epotetiometer R4 will icrease t(e $olta!e o t(e sli)er, w(ic( will 3orce t(e sta*ilier %*y error

ampli3ier& re)uctio o3 t(e output $olta!e so t(at t(e potetial o3 t(e sli)er )eclie) to *e 3ie)re3erece )i$i)er R0 - R. & wit( T6trasistor %54& wors as a security o$er curret %curretlimit&.

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s(ort circuit *etwee t(e emitter a) t(e *ase trasistors a) t(us limit t(e curret 3lowi!t(rou!( T1.>ori! (ere more 3ee)*ac, a) t(e curret will *e limite) to a*out 0.6 = R2,w(ic( i t(is case !i$es #. '(e resistor $alue s(oul) *e selecte) o t(eir ow, w(ereas t(euse) tras3ormer a) its per3ormace. e use t(e 3ollowi! 3ormula:

BB C ar!e ?Ds E /DR C c)ot C 3rac FRD0 RDG FRD0 H RDG BB

w(ic(, a3ter tras3ormatio re)uces to t(e 3orm:

http://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/files/ZS_Z_PCBBottom.pdf&usg=ALkJrhgeYaZPfRvSM069HXSc2_Bu33tHVghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/files/ZS_Z_PCBBottom_l.pdf&usg=ALkJrhhdJqac3lO32qKt2E3bAbC7zzsKtghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/files/ZS_Z_PCBBottom.pdf&usg=ALkJrhgeYaZPfRvSM069HXSc2_Bu33tHVghttp://translate.googleusercontent.com/translate_c?depth=1&hl=en&prev=search&rurl=translate.google.com&sl=pl&u=http://mirley.firlej.org/files/ZS_Z_PCBBottom_l.pdf&usg=ALkJrhhdJqac3lO32qKt2E3bAbC7zzsKtg

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BB C ar!e RD E C 3rac F/DS = /DR C c)ot RD0G F1- /DS = /DRG BB

/DS a )esire) $olta!e at t(e iput o3 t(e error ampli3ier a) /DR is a re3erece o t(e le! 6 o3t(e U1%typically / *ut < recomme) to measure&.

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two 12/ wi)i!s are coecte) i series, !i$i! a total o3 224/. '(is seemi!ly complesolutio will si!i3icatly impro$e t(e (eat )issipatio case o3 ra)iators. 17 %or 4 0,1R > 17&

1 220R2 510R2 560R1 4,1 5,61 6,

2 02 1001 Potetiometer 10 MotaJowyRotary Potetiometer 1 50

1 1;4 100;2 40u; electrolyte

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2 400u; electrolyte

2 5# *ri)!e recti3ier1 54

1 551 191 140 911 9121 '011 u#2

P+oto& o t+e Pro,ect:

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Anne- Sie

Sc(eme 40. @

Plate 15.9 @

Plate %mirror ima!e& 15.9 @

Plate %pa!e 6& 40.4 @

Mouti! 19.2 @

escriptio 2.65 @

Sol)ermas 20.49 @

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