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TEE202/05 POWER ELECTRONICS

AND DRIVES

TMA1

(5 SEPTEMBER, 2014)

Regional Office: PENANG

Tutor !"#$% MR.TEOH KUNG YU

Stu&$!t !"#$% S.NANIGESWARAN S/O SANDARASIGERAN

Stu&$!t ID% 041120049

'"!& o!$ No% 017-4323792


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Question 1 (20 marks)

List four main applications of power electronics.

- Industrial : Industrial furnaces, blowers and fans, pumps

and compressors.

- Residential : Air conditioning, cooking, lighting,

refrigerators.

- Transportation : traction control of electric vehicles, street

cars, automotive electronics.

- Aerospace : Space shuttle power suppliesSatellite power

supplies.

- High power conversion equipment such as dc transmission

- Everyday application such as cordless screw driver or power

supplies for noteboo computer

1* !"#!" converter are used in most mobile devices$mobile

phone% pda and etc& to maintain the voltage at fi'ed value

whatever the change level of the battery is. (hese

converters are also used for electronic isolation and power

factor correction

). *"#!" converter rectifiers are used every time an

electronic devices is connected to the mains$computer%

television and etc.

+. *"#*" converters are used to change either the voltage

level or the frequency international $power adapters% light

dimmer&. ,n power distribution networ *"#*" converters

may be used to e'change power between utility frequency

H/ and 0H/ power cycle.

4* !"#*" converters $inverters& are used primarily in 123 oremergency light. !uring normal electricity condition% the

electricity will change the !" battery. !uring blacout time%

the !" battery will be used to produce *" electricity at its

output to power up the appliance.

$4 mars&

,n linear circuit% the voltage source is vs5 6)sin$6+t 7 )48& 9.

i. hat is the angular frequency of the voltage; $+ mars&


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angular fre!uenc" #

# $.%&'

%$

f

Hz

==

=

ii. hat is the frequency of the source;

%

%

(.#)

$.%&'

FrequencyT

fms

f Hz

=

=

=

$+ mars&

iii.


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5/13


6/13

mars&

Hint:

$.) %(.(-

%.( %$

oT kT

=

=

=

%

#

% #

sin *% , cos *% ,

# #

$.) sin%.( %$ *% $.), cos *% $.),%$$

# #

%+$

#

#$

orms p

T k kkI I

= +

= +

=

=



7/13

(he branch current in an RL" circuit is described by the

differential equation $v+dt

dv+

dt

vd#

#

=++ subAect to the initial

condition v$& 5 6 and dv$dt 5 -6.

i. !etermine the characteristic equation.

#

#

#

+ + $

+ + $

+ + $* #*r # $

r #

d v dvv

dt dt

v v v

r rr

+ + =

+ + =

+ + =+ + =

=

$) mars&

ii. mars&


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9/13

* trape/oidal wave form is shown in


10/13


11/13

$

% # #%

$ $

$ $ %

$

$

% #

$ %

%

$# #

# #

, $ %*

$, % #

Since T #, # / T .Then

% % % %a * $# # # +

#* cos

#cos $cos

#

% %cos sin

% *cos % $ si

T

T

n

t tf t

t

tf t dt t dt dtT

a f t n t dt T

t n t dt n t dt

n t n t n n

nn

<


12/13


!escribe the operation of a !,*" and its characteristics. Cou may

draw diagrams to illustrate your answers.

T$ DIAC + " to t$r#+!"- $#+.o!&u.tor +t.+!

&$+.$ t"t ."! $ .o!&u.t +! ot or"r& "!& r$$r$

o-"r+t+$* T$ #"+! u!.t+o! o DIAC + to +#ro$

o$r"t+o! o "-t$r!"t+! .urr$!t o$r +t.+! 3t$#*

T$ !"#$ o DIAC +t .o!tr".t+! o D+o&$ A-t$r!"t+!

Curr$!t, +t #"+!-3 u$ +! &+##$r "-+."t+o! "!& "-o +!

t"rt$r .+r.u+t or or$.$!t -"# "!& +&$-3 u$& to

"+t $$! tr+$r+! o TRIAC $! u$ +! AC +t.$*

T$ o$r"t+o! o DIAC

It .o!&u.t ON o!-3 $! t$ "-+$& o-t"$

$6.$$& t$ r$"7 o$r o-t"$ &$+!"t$& VBO*

W$! t$ &$+.$ $6.$$& t+ r$"7o$ro-t"$, +t

$!t$r t$ r$+o! o !$"t+$ &3!"#+. r$+t"!.$*

T$ &+o&$ r$#"+! +! .o!&u.t+o! t"t$ u!t+- t$ .urr$!t

trou +t &ro "t + t$r# t$ o-&+! .urr$!t, +. +

!or#"--3 &$+!"t$& 3 t$ -$tt$r I'*

$ mars&

"alculate the rmsvalue and the power applied by a (R,*" to a

6 load from )+ 9rmsH/ with a control period of .ms

$6 mars&


13/13

when the (R,*" triggering time is )ms.

$* ,

$* ,

$* ,

#

$* ,

%$ , #$ , &$ , #$ #($

($ &$ &

'$

%

#

sin#

#

#

%sin#

% #

# ##$ #

#

%$

##$ ##

#$ #*$.&

%(#.(

%(#.(

%$

%(.#(

*

*

s z

rms

rms

rms

rms

!iven

" V V f H Vmf t

V Vm

VV

I"

A

# I "

= = = ==

= =

=

+= =

+

=

+=

=

==

=

=

=

= #$* ,

%$

#(++.)& .

rmsI

$att

=

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