formula shhet
TRANSCRIPT
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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