Universidad Nacional de Ingeniería
Facultad de Electrotecnia y Computación Electrónica Aplicada
INFORME DE LABOR L ABORA ATORIO 3 PWM CON SG3524
ELABORAO !OR" • • •
Cinthya Hernane! D"ran Mi#"e$ An#e$ F$%re& Ti'ay E#ar G%n!a$e&
Gr"(% 3N) * E% D%'ente+ In#, Fe$i(e Pa! -.3-2.)5
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica
'ema" PWM "&an% SG3524 i(
OB)E'I#O$
O*+etivo %eneral •
C%/(r% C%/( r%0a 0arr /e /ei ian ante te $a (r (r1' 1'ti ti'a 'a e$ " "n' n'i% i%na na/i /ien ent% t% e "n 'i 'ir' r'"it "it% % #enera%r e PWM "&an% e$ IC SG3524,
O*+etivos Especí,cos • • •
ii(
Ca$'"$ar $a re'"en'ia re'"en'ia e %&'i$a'in %&'i$a'in (ara e$ IC SG3524, M%ntar e$ 'ir'"it% e$ PWM en a'% eri6'an% $a re'"en'ia 'a$'"$aa, 7eri6'ar $a /%"$a'in e$ an'h% e ("$&% y re'"en'ia e %&'i$a'in '%ntr%$aa (%r ten&in,
IN'ROUCCI-N
E$ SG3524 e& "n re#"$a%r e '%n/"ta'in e 'ir'"it%& inte#ra%& 8"e tiene t%%& t% %& $%& 'ir 'ir'"i '"it%& t%& e&e e&en'i n'ia$e a$e& & ne' ne'e&a e&ari% ri%& & (ar (ara a $a t%/ t%/a a e "n re re#"$ #"$a% a%rr e '%n/"ta'in en e$ /%% ("&h9("$$, L%& 'ir'"it%& entr% e$ SG3524 in'$"yen /%"$a%r e an'h% e ("$&%: %&'i$a%r: ten&in e reeren'ia: a/($i6'a%r e err%r: e$ 'ir'"it% e (r%te''in '%ntra &%0re'ar#a&: $%& '%n"'t%re& e &a$ia: et', C%/% ("ee n%tar&e: e$ SG3524 e& e$ '%ra!n e e&te iner&%r PWM: 8"e ("ee '%rre#ir $a ten&in e &a$ia en '%ntra e $a& aria'i%ne& en $a 'ar#a e &a$i &a $ia a,, En "n in ine er& r&%r %r PW PWM M e$ 'a 'a/0 /0i% i% en $a 'a 'arr#a e &a &a$i $ia a n% a ae' e'ta ta ire'ta/ente a $a ten&in e &a$ia ;'"an% $a 'ar#a a"/enta $a (r%"''in i&/in"ye $a ten&in e &a$ia y i'eer&a<: (er% en "n iner&%r PWM e$ %$ta=e e &a$ia &e /antiene '%n&tante en "n ran#% e 'ar#a e &a$ia, E$ Re&i&%r R) y e$ 'a(a'it%r C) a="&ta $a re'"en'ia interna e$ %&'i$a%r e IC, En e$ /%% Pree&ta0$e'i% R) ("ee &er "ti$i!a% (ara e$ a="&te 6n% e $a re'"en'ia e$ %&'i$a%r, E$ (in )4 y (in )) &%n $%& ter/ina$e& e$ e/i&%r e$ tran&i&t%r '%n"'t%r intern% e$ 'ir'"it% inte#ra%, La& ter/ina$e& e$ '%$e't%r
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica iii(
E$ARROLLO
.edios a utili/ar O&'i$%&'%(i% M"$t/etr% Brea0%ar
• • •
Componentes0ispositivos a utili/ar Cantida d
Componente
) 2 )
SG3524 Re&i&t%re& 2,2@ Ω C%nen&a%r e 'er1/i'a e .,.4? F
Reali/ Real i/am amos os lo los s c1 c1lc lcul ulos os pr prev evio ios s pa para ra o* o*te tene nerr la las s 2r 2rec ecue uenc ncia ias s de oscilación del $%3456 f = =
T
(
1.30
)( 0.05 µF )
2 2.2 K
=
=5.90 Khz
169.23 µS
A '%ntin"a'in (r%'ei/%& a /%ntar e$ 'ir'"it% e $a 6#"ra en e$ (r%t%0%ar, (r%t%0%ar,
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica
#alores de 2recuencia medidos en la pr1ctica en el osciloscopio para el %0t"i/%& %& "n T 176 µSeg $%3456 $%3 456 usando usando un capacito capacitorr de 0.047 µF %0t"i/ =
'%n F
=
5.68 KHz
Resultado de los C1lculos !r1cticos #78#9
t78s9
t58s9
'8s9
F8:/9
8 ;9
7
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7(4
)5 S
2. S
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5
)4. S
3 S
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?,5
5(4
)2 S
52 S
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5,> @H!
?),5
3
). S
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5,> @H!
.,2
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica
7) )7
#7 < 7(4
#7 < #7 <
#7 < 5#
#7 < 3# #7 < 6#
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica
iv(( iv
iv(
CONCLU$IONE$
O*servamos en la pr1ctica como el $%345 O*servamos $%3456 6 act=a como generador generador de !>.? calculando los elementos de R7 y C7 para a+ustarlo a 2recuencia indica ind icada da de 4@ 4@: : o*t o*teni eniend endo o así los val valore ores s sol solici icitad tados os com como o son 7) 3,57 2recuencia? 2recu encia? periodo periodo?? dutycycle dutycycle y los ancos ancos de pulsos ue genera genera el $%3456( Con la variación del #olta+e de Control o compensación en el pin D podemos o*servar ue el utycycle se modi,ca al llegar a 6# el uty u tycy cycl cle e di dism smin inuy uye e a ast sta a ll lleg egar ar al 4 ; de do dond nde e no di dism smin inuy uye e aun au nu ue aum umen ente te el vol olta ta++e de co cont ntrrol ol?? ta tall y co como mo lo in ind dic ica a el ataseet(
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UNI#ER$IA NACIONAL E IN%ENIER&A Facultad de Electrotecnia y Computación Ingeniería Electrónica
Al ,nal de la pr1ctica notamos ue despuGs de un volta+e de control de 3(6# se mantuvo el anco de pulso en t7
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