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BUDAPESTUNIVERSITY OF TECHNOLOGY AND ECONOMICS

DEPARTMENT OF AUTOMATION AND APPLIED INFORMATICS

Power Electronics

André Martins Otomura - KWVNRV

Carlos Eduardo Montenegro - PR3PTJ

B!APE"T

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!e#em$er %&t'( &)%*"MMAR+

,NTRO!CT,ON 3

A,M 3

EPER,MENT" 3

CONC.",ON /

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! INTRODUCTION

  T'ere are se0eral #ases in 1'i#' t'e start-u2 o anele#trome#'ani#al s4stem 2resents t'e #riti#al situation or t'e #ir#uit5 insome #ases t'e 0oltage o t'e #ir#uit is 'ig' or t'e #urrent o t'e #ir#uit is

'ig' to turn on6o7 t'e s4stem8 ,n t'is #ase is 2ossi$le use a t'4ristor toma9e it 2ossi$le8

"! AIM

 T'e aim o t'ese e:2eriments is to in0estigate t'e o2eration o at'4ristor in !C and an in0estigation o an AC #'o22er8

#! E$PERIMENTS

#! % Test o& t'(ristor in DC)

a; W'en t'e 2o1er su22l4<P"%; is turned on $4 s1it#'<K%;( 1e 1illsee t'e 0alues= &> &)V5 t> &)V5 ,t> )V5 t> )V8 ,n t'is #ase t'e state o t'e t'4ristor is O??8

$;Ater t'e 2ro#edure <a; t'e 2o1er su22l4 <P"&; is turned on $4s1it#'<K&;( 1e 1ill see t'e 0alues= &> &)V5 t> )(@V5 ,t> )()/V5 t>%V8 ,n t'is #ase t'e state o t'e t'4ristor is ON8

#;O$ser0ing t'at i t'e 2olarit4 o t'e ring 0oltage is #'anged 1e

1ill see t'at not'ing 1ill 'a22en8

3

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d; Turnning o7 K& and ma9ing a s'ort-#ir#uit t'e terminals o t'et'4ristor 1e #an see t'at t'e t'4ristor 1ill Dust turn o7 1'en t'e s'ort-#ir#uit is nis'ed8

e; ,n t'is #ase t'e t'4ristor 1ill turn o7 1'en t'e K is in t'e o22osite

2osition8 ,t 1ill 'a22en due to t'e #a2a#itor #'arge #'anging t'e 2olarit4in t'e t'4ristor( t'en it is used to turn o7 it8

#!" % In*esti+,tion o& AC C'oo-er)

At t'is 2art o t'e la$orator4 2ra#ti#e( onl4 o$ser0ations 1ere made($4 t'e use o an os#illos#o2e #onne#ted to t'e alread4 assem$led s4stem8

 T'e o2eration o t'e AC C'o22er 1as anal4sed 1it' t'ree di7erent ringangles <;8

  α <φ

,n t'e rst #ase( 1it' ring angle smaller t'an 2'ase angle( t1o#ur0es 1ere o$ser0ed on t'e os#illos#o2e8 T'is 1as a situation1'ere onl4 t'4ristors 1ere 1or9ing in t'e s4stem8

  α =φ

 T'e se#ond set-u2 1as 1it' t'e ring angle set to $e eFual to t'e2'ase angle8 W'at 1as seen 1as t'at t'e #ur0es or t'e 0oltage#oin#ided( as i t'ere 1ere no t'4ristors at all8

  α >φ

At last( t'e ring angle 1as set to $e larger t'an t'e 2'ase angle8,n t'is #ase( t'e #ur0es 1ere #om2li#ated to o$ser0e8 W'at #ould$e seen 1as t'at t'e t'4ristors 1ere 1or9ing one at a time8

Gere is a 2'otogra2' o t'e s4stem 1it' t'e os#illos#o2e 1'i#' 1asused during t'e e:2eriment=

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.! CONCLUSION

,n t'is e:2eriment( it #ould $e seen some o t'e utilities o 2o1erele#troni#s( and in 'o1 man4 a22li#ations it ta9es 2la#e in 'uman dail4lie8 Also( t'e 1or9ing me#'anism o t'4ristors #ould $e seen( tested andt'eir $e'a0iour #ould $e o$ser0ed as good solutions 1'en 1or9ing 1it'$ot' !C and AC8

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