MAGNETIC AMPLIFIER-final.pptx

8/19/2019 MAGNETIC AMPLIFIER-final.pptx

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WELCOME


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MAGNETIC AMPLIFIER

Submitted by:-

DharmendraChaurasia

1109131037


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Contents

Introdution!istory

"m#$i%er

Ma&neti am#$i%er

Saturab$e reator

'rini#a$ o( ma&neti am#$i%er

Wor)in& o( ma&neti am#$i%er

"##$iation* stren&th + $imitation ,ses in radio* airra(t + om#utin&

Con$usion


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I./OD,C.IO

1"n e$etroma&neti deie (or am#$i(yin&e$etria$ si&na$

2 " ma&neti am#$i%er uses the #rini#$e o(

trans(ormers a$on& ith the one#t o(ma&neti saturation o( the ore

3Does not re4uire any moeab$e #art

5 .he ma&neti am#$i%er has ertain

adanta&es oer :-

a6!i&h eieny

b6/e$iabi$ity

6/u&&edness


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!IS.O/8

1 Dee$o#ed as ear$y as 1 in unitedstate

2 "t that time main$y used (or e$etrimahinery and theater $i&htin&

3 Durin& or$d ar II ;ermans used it

in $on& ran&e ro)ets to re&u$ate(re4ueny out#ut o( an a &enerator

5 Ear$y time its uses as ear$ydee$o#ment o( oie transmission byradio


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"m#$i%er

1 "n e$etroni am#$i%er is an e$etroni

deie that inreases the #oer o( a si&na$2 It does this by ta)in& ener&y (rom a #oer

su##$y and ontro$$in& the out#ut to maththe in#ut si&na$ sha#e but ith a $ar&er

am#$itude

3 "n am#$i%er modu$ates the out#ut o( the#oer su##$y

5 .here are (our basi ty#es o( e$etroniam#$i%er:-

a6 =o$ta&e am#$i%er b6Currentam#$i%er

6.rans-ondutane am#$i%er


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Ma&neti am#$i%er

.he ma&neti am#$i%er is an

e$etroma&neti deie (or am#$i(yin&e$etria$ si&na$s

.he ma&neti am#$i%er as inentedear$y in the 20th entury

It as used as an a$ternatie to auumtube am#$i%ers here robustness andhi&h urrent a#aity ere re4uired

In Wor$d War-2 ;ermany used this ty#e o(am#$i%er* and it as used (or instane inthe =-2 ro)et

.he ma&neti am#$i%er as most#rominent in #oer ontro$ and $o-


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.he saturab$e reator

.he saturab$e reator is the deie (romhih

the ma&neti am#$i%er has been

(undamenta$$y dee$o#ed

.he three essentia$ e$ements o( saturab$e

reator are:-


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.he saturab$e reator

>ontinued?6


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'rini#a$ o( ma&neti am#$i%er

1 " ma&-am# deie may $oo) $i)e a

transformer but the o#eratin& #rini#$eis 4uite di@erent (rom a trans(ormer -essentia$$y the ma&-am# is a saturablereactor

2 It ma)es use o( ma&neti saturation o(the ore

3 Aor ontro$$ed saturationharateristis* the ma&neti am#$i%er

em#$oys ore materia$s hih hae a

s#ei% B-! ure sha#e that is hi&h$yretan&u$ar* in ontrast to the s$o$y-ta#erin& B-! ure o( so(t$y saturatin&ore materia$s that are o(ten used in

norma$ trans(ormers


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Wor)in&1.he ty#ia$ ma&neti am#$i%er onsists o( to #hysia$$y

se#arate but simi$ar trans(ormer ma&neti ores eah o(hih has to indin&s - a ontro$ indin& and an "Cindin&

2 " sma$$ DC urrent (rom a $o im#edane soure is (ed

into the series-onneted ontro$ indin&s .he "Cindin&s may be onneted either in series or in #ara$$e$*the on%&urations resu$tin& in di@erent ty#es o( ma&am#s

3.he amount o( ontro$ urrent (ed into the ontro$

indin& sets the #oint in the "C indin& ae(orm athih either ore i$$ saturate In saturation* the "Cindin& on the saturated ore i$$ &o (rom a hi&him#edane state >o@6 into a ery $o im#edane state

>on6 - that is* the ontro$ urrent ontro$s at hiho$ta&e the ma& am# sithes on


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.he ty#ia$ ma&neti am#$i%er iruit

shon aboe has the (o$$oin&om#onents:1.R1 - $oad resistane2.G - &ate indin&

3.C - ontro$ indin&4.Ec - eitation.Es - in#ut (rom "C soure!.Is - am#$i%ed "C urrent

".Ic - ontro$ DC urrent


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"##$iation

As modulation and control amplifiers in the early

development of voice transmission by radio. As voice modulator and magnetic amplifiers were used

in the keying circuits of large high-frequency

alternators used for radio communications.

Magnetic amplifier is useful for control of lighting

circuits, for stage lighting and for advertising signs.

Saturable reactor amplifiers were used for control of

power to industrial furnaces.


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,sa&e inom#utin&

Magnetic amplifiers were widely studied duringthe 1!"s as a potential switching element for

mainframe computers.

Mag amps could be used to sum several inputs in a

single core, which was very useful in the

arithmetic logic unit #A$%&.

'he mag amp was able to combine the advantages

of tubes and transistors in an era when the latter

were e(pensive and unreliable.


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Stren&th

A static device with no moving parts.

)as a good tolerance to mechanical shock and vibration.

*t requires no warm-up time.

Multiple isolated signals may be summed by additionalcontrol windings on the magnetic cores.

'he magnetic amplifier is also used as a transducer in

applications such as current measurement and the flu(

gate compass.


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Limitations

'he gain available from a single stage is limited and low

compared to electronic amplifiers.

Solid-state amplifiers can be more compact and efficient

than magnetic amplifiers. 'he bias and feedback windings are not unilateral, and

may couple energy back from the controlled circuit into

the control circuit. 'his complicates the design of multistage amplifiers

when compared with electronic devices.


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Con$usion "$thou&h* ma&neti am#$i%er is anoutdated

tehno$o&y in #resent trend* It is the%rst deie

hih an re#$ae (ra&i$e auum

tube in

a$most a$$ its (untion

It has &ood mehania$ stren&th andmaintenane (ree


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')A+ %

MAGNETIC AMPLIFIER-final.pptx

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