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Midterm ELE754/EE8410 Power Electronics October 28, 2010

Page 2 of 7

01

1min R

E

e

e RV

I s

on

T

t

d

onon t d

t

x e E E V

et I 11ln,0min

Forward and flyback converter

d o V D D

N

N V

112 for flyback converter d o DV N

N V

1

2 for forward converter

DC motor drives

aa

aaat E dt di

Li Rv for armature circuitdt

di Li Rv f f f f f for field circuit

maa K E aae iK T

dt d J T T T m Lme , where J is the moment of inertia.

Power Factor, THD and distortion factor

Distortion factors

s

I

I DF 1

1

21

2

THDs

ss

I

I I

Power factor DPF DF I

I PF

s

s1

1 cos 12 cosTHD1

1PF

Diode rectifier with inductive load

Single phase diode rectifier with inductive load Three phase diode rectifier with inductive load

ssd V V V 90.022

LL LLavgd V V V 35.1

23,

d

T

d

T

srmss I dt I T dt i

T I

0

2

0

2,

11 d d rmsa I I I 816.03

2,

...5sin51

3sin31

sin4

t t t I t i d s for single phase

...13sin13

111sin

11

17sin

7

15sin

5

1sin

32t t t t t I t i d a

for 3-phase

Single phase diode rectifier with capacitive load

s

d b

V

V

2arcsin b p

0and,coscos21 f d bd bss

d iV V Li