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8/19/2019 Power Labmanual
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V-I CHARACTERISTICS OF SCR
Aim: To conduct suitable experiment to plot V-I characteristics o !i"en SCR and also to
obtain holdin! and latchin! current#Circuit $ia!ram:
Apparatus re%uired:
1. SCR characteristics study unit by Pragna Microdesigns2. SCR-TYN616
3. Patch Chords
&rocedure to ind 'atchin! current and to plot V-I characteristics:
1. Make the connections as shon in the circuit diagra!.
2. "ee# $%& ' $C& and Potentio!eter(R )* at !ini!u! #osition.3. Sitch +N #oer su##,y.
. %dust /0 to so!e a,ue (Say !%*.
. S,o,y ary $%& and note done a,ues o4 $%& and /%.
6. Note don the a,ues o4 ,atching current (/5*.. Continue the e)#eri!ent ti,, $%& a##,ied to its !a)i!u!.
. Re#eat the e)#eri!ent 4or di44erent a,ues o4 /0.7. P,ot $%& $8S /% 4or di44erent a,ues o4 /0.
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&rocedure to ind Holdin! current:
1. 9ring the deice to conduction state.
2. Sitch +:: the 0ate su##,y.3. Start reducing ,oad current by arying R % and $%&.
. +bsere 4or hat a,ue o4 /% the deice goes to b,ocking !ode. This current is ;o,dingcurrent /;.
Tabular Column:
/01
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Aim: To conduct suitable experiment to plot V-I characteristics o !i"en *OSFET#
Circuit $ia!ram:
Apparatus Re%uired:
1. M+S:>T 8/09T characteristic study unit ? Pragna Microdesigns.
2. Patch chords.
&rocedure:
Trans conductance characteristics:
1. Make the connections as shon in the circuit diagra!.2. /nitia,,y "ee# $0S @ $AS at !ini!u! #osition.
3. Sitch +N #oer su##,y.
. %dust $AS to say $.. $ary $0S in ste#s and note don the readings o4 $0S @ /A.
6. Continue the e)#eri!ent ti,, !a)i!u! a,ue o4 $0S is reached.
. Re#eat the e)#eri!ent 4or di44erent a,ues o4 $AS.. P,ot the gra#h o4 /A $8S $0S 4or di44erent a,ues o4 $AS.
Tabular column:
$AS1
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$0S
o,ts
/A
!%
$0S
o,ts
/A
!%
T(pical )raph:
Output Characteristics:
1. Make the connections as shon in the circuit diagra!.
2. /nitia,,y "ee# $0S @ $AS at !ini!u! #osition.
3. Sitch +N #oer su##,y.. %dust $0S to say $.
. $ary $AS in ste#s and note don the readings o4 $AS @ /A.
6. Continue the e)#eri!ent ti,, !a)i!u! a,ue o4 $AS is reached.. Re#eat the e)#eri!ent 4or di44erent a,ues o4 $0S.. P,ot the gra#h o4 /A $8S $AS 4or di44erent a,ues o4 $0S.
Tabular column:
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Aim: To plot the instantaneous output "olta!e " and the load current i#
Circuit $ia!ram:
&spice Circuit ile:
Output .a"eorm
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SI+)'E &HASE CO+VERTER
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Aim: To plot the instantaneous output "olta!e "o the input current is and the load current
io#
Circuit $ia!ram:
To calculate time dela(:
&spice Circuit ile:
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Output .a"eorm
SI+)'E &HASE F/'' CO+VERTER
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Aim: To plot the instantaneous output "olta!e "o and the load current io#
Circuit $ia!ram:
To calculate time dela(:
&spice Circuit ile:
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Output .a"eorm
SI+)'E &HASE F/'' 0AVE AC VO'TA)E CO+TRO''ER
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&roblem: A sin!le phase ull .a"e ac "olta!e controller is sho.n in i! a# the input "olta!e
has a pea1 "alue o 234"5 3H6# The load inductance ' is 3#7mH5 and the load resistance R
is 8#7 ohm# The dela( an!les are e%uals 94o# The !ate "olta!e are sho.n in i! b# se &spice
;a< &lot the instantaneous output phase Vo and load current Io# and
;b< To calculate the Fourier co-eicients o the input current I5 and the input po.eractor#
Circuit $ia!ram:
Solution:
&spice Circuit ile:
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THREE &HASE ,RI$)E RECTIFIER
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Aim: To plot the instantaneous output "olta!e "o and load current io#
Circuit $ia!ram:
&spice Circuit ile:
Output .a"eorm
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AC VO'TA)E CO+TRO''ER /SI+) TRIAC-$IAC
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Aim: To plot the instantaneous output "olta!e "o and the load current io#
Apparatus re%uired: *odule b( &ra!na *icrodesi!ns# CRO# CRO probe# &atch cords#
Circuit $ia!ram:
&rocedure:
2# *a1e the connections as !i"en in the circuit dia!ram#8# S.itch O+ the main suppl(#=# Var( the irin! an!le potentiometer and obser"e the "ariation in lamp bri!htness and
also note do.n the "olta!e across the lamp load or dierent irin! an!les#># &lot a !raph o irin! an!le "ersus "olta!e#
Tabular column:
:iring
ang,e B
(degrees*
$o,tage
across the
,a!# ,oad
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($o,ts*
0a"eorms:
0a"eorms:
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CO+TRO''E$ H0R A+$ F0R /SI+) RC TRI))ERI+)
Aim: To stud( Controlled H0R and F0R circuit#
;a< Controlled H0R usin! RC tri!!erin!
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Circuit $ia!ram:
&rocedure:
2# Connections are made as sho.n in the circuit dia!ram#
8# Suppl( is s.itched on# ,( "ar(in! 2*? potentiometer in steps irin! an!le is chan!ed#=# At each step the irin! an!le @ "olta!e across load are tabulated#># 0a"eorm across load @ SCR are obser"ed#7# A !raph o load "olta!e "s irin! an!le is plotted#
Tabulations:
S5 N+ :iring ang,e B 5oad o,tage $5
Practica, Theoritica,
Theoretical load "olta!e V' Vm;2BCOS9
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;b< CO+TRO''E$ F0R /SI+) RC TRI))ERI+)
Circuit $ia!ram:
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&rocedure:
2# Connections are made as sho.n in the circuit dia!ram#8# Suppl( is s.itched on# ,( "ar(in! 2*? potentiometer in steps irin! an!le is chan!ed#=# At each step the irin! an!le @ load "olta!e V' are tabulated#
># 0a"eorm across load @ th(ristor are obser"ed#7# A !raph o load "olta!e "s irin! an!le is plotted#
Tabulations:
S5 N+ :iring ang,e B 5oad o,tage $5
Practica, Theoritica,
Theoretical load "olta!e V' Vm;2BCOS9
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THREE &HASE F/'' 0AVE AC VO'TA)E CO+TRO''ER
&roblem: A three-phase ull .a"e ac "olta!e controller is supplied rom a .(e-
connected suppl(# It is sho.n in i! a# the input phase "olta!e has a pea1
"olta!e o 234#D"# 3H6# The load resistance per phase is R8#7 ohm# The dela(
an!le is 93o# the !ate "olta!e are sho.n in i!# /se &spice;a
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;b
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&spice Circuit ile:
STE&&ER *OTOR CO+TRO''ER
Aim: To control the speed o a stepper motor#
Apparatus re%uired: Stepper motor 1it b( &ra!na *icrodesi!ns# CRO# CRO probe# &atch
cords#
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Circuit $ia!ram:
&rocedure:
2# Connect A25A8,2 and ,8 leads o stepper motor to the correspondin! output terminal
points and t.o common terminals to V suppl(#8# S.itch O+ the mains suppl( to the unit# Ater e. seconds R&* blin1s# &ress I+C$EC
1e( to select STE& or R&* ;continuous rotation < mode#=# Ater selectin! R&* STE& mode press SET 1e( to select the mode +e. 2 blin1s# This
corresponds to number o rotation or number o steps># &ress I+C$EC 1e( to select the speed or
7# &ress I+C$EC 1e( to select the direction o rotation and press SET 1e( to select#
+o. F/'' blin1s# This corresponds to ull steps# &ress I+C$EC 1e( to select Hal
step Full step mode and press SET 1e( to select HalFull step mode#
3# +o. the settin! is o"er# &ress R/+STO& 1e( the stepper motor rotates at the set
speed i R&* is selected or it mo"es the number o steps set and stops# A!ain
pressin! R/+STO& 1e( the motor stops i it is in R&* mode or it a!ain mo"es the
number o set steps and stops#
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D# Set the step mode5 2step# FOR0AR$ and Hal step mode# Chec1 the output status
b( 'E$ indication or each step and "eri( .ith the s.itchin! lo!ic se%uence as
!i"en in the truth table#
# Repeat the same or ull step mode# Repeat the same or re"erse direction
S0ITICHI+) 'O)IC SEG/E+CE
For ull step mode For hal step mode
A2
Re
d
A8
,lac
1
,2
,lu
e
,8
)reen
2 2
2 2
2 2
2 2
G2 G8 G= G>
+OTE: To chan!e the direction o rotation read se%uence rom bottom to top
Tabular Column:
Sl +o Fre%uenc(In H6
Time or Fi"eRotations
Time or onerotation ;T2<
R&*
A2
Red
A8
,lac1
,2
,lue
,8
)ree
n 2 2
2
2 2
2
2 2
2
2 2 2
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