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ed
m
u
ltil
e
v
el
in
v
er
ter
.
U
s
in
g
H
-
b
r
id
g
e
cir
c
u
it
th
e
n
u
m
b
er
o
f
v
o
lta
g
e
le
v
els
ca
n
b
e
in
cr
ea
s
ed
w
it
h
m
i
n
i
m
u
m
D
C
v
o
lta
g
e
s
o
u
r
ce
s
.
T
h
e
r
ate
o
f
ch
an
g
e
o
f
v
o
ltag
e
(
d
V
/d
t)
is
also
less
w
h
ich
ca
u
s
es
lo
w
elec
tr
o
m
ag
n
etic
i
n
ter
f
er
en
ce
.
Ho
w
ev
er
,
th
e
s
e
ca
s
ca
d
ed
H
-
B
r
id
g
e
ML
I
s
also
h
a
v
e
s
o
m
e
d
r
a
w
b
ac
k
s
.
T
o
in
cr
ea
s
e
t
h
e
co
u
n
t o
f
v
o
lta
g
e
lev
els
in
t
h
e
o
u
tp
u
t
v
o
ltag
e,
ci
r
cu
it r
eq
u
ir
es
m
o
r
e
n
u
m
b
er
o
f
s
w
i
tch
e
s
,
an
d
g
ate
d
r
iv
in
g
cir
cu
it
s
also
in
cr
ea
s
es
.
T
h
is
r
esu
lts
a
n
in
cr
ea
s
e
i
n
c
o
s
t
an
d
co
m
p
lex
it
y
ag
ain
.
T
h
er
ef
o
r
e,
w
e
h
a
v
e
to
co
n
s
id
er
th
e
s
w
itc
h
co
u
n
t
wh
ile
i
m
p
le
m
e
n
ti
n
g
th
i
s
to
p
o
lo
g
y
.
T
h
e
o
p
tim
ized
d
esig
n
is
t
h
at
it s
h
o
u
ld
h
av
e
le
s
s
n
u
m
b
er
o
f
s
w
itc
h
es
f
o
r
m
o
r
e
v
o
ltag
e
le
v
els.
I
n
th
i
s
p
ap
er
,
a
n
e
w
co
n
f
i
g
u
r
atio
n
is
p
r
o
p
o
s
ed
f
o
r
an
ele
v
en
l
ev
el
o
u
tp
u
t
v
o
ltag
e
w
ith
r
ed
u
c
ed
s
w
itch
co
u
n
t.
T
h
is
co
n
f
ig
u
r
atio
n
g
i
v
es
h
y
b
r
id
H
-
B
r
id
g
e
m
u
ltil
e
v
e
l
in
v
er
ter
.
I
n
th
is
co
n
f
i
g
u
r
atio
n
,
th
e
d
io
d
e
b
r
id
g
e
cir
cu
it
i
s
co
n
n
ec
ted
at
s
o
u
r
ce
s
id
e
alo
n
g
w
it
h
H
-
B
r
id
g
e
cir
cu
it.
B
ec
au
s
e
o
f
t
h
is
d
io
d
e
b
r
id
g
e
cir
cu
it
t
h
e
b
id
ir
ec
tio
n
al
o
p
er
atio
n
is
p
o
s
s
ib
le.
Fo
r
an
elev
e
n
lev
e
l
o
u
tp
u
t
v
o
lta
g
e
t
h
e
p
r
o
p
o
s
ed
co
n
f
i
g
u
r
atio
n
r
eq
u
ir
es
8
s
w
itc
h
es
i
n
ea
ch
p
h
a
s
e,
w
h
er
e
as
ca
s
ca
d
ed
H
-
b
r
id
g
e
to
p
o
lo
g
y
r
eq
u
ir
es
2
0
s
w
itc
h
es
in
ea
ch
p
h
a
s
e.
I
n
t
h
i
s
p
r
o
p
o
s
ed
to
p
o
lo
g
y
,
d
u
r
i
n
g
t
h
e
o
p
er
atio
n
if
an
y
v
o
ltag
e
ce
ll
h
as
f
ai
lu
r
e
d
u
e
to
an
y
r
ea
s
o
n
,
th
er
e
w
o
u
ld
b
e
n
o
d
is
co
n
ti
n
u
i
t
y
in
t
h
e
i
n
v
er
ter
o
p
er
atio
n
.
B
u
t,
it
o
p
er
ates
a
t
lo
w
p
o
w
er
le
v
els
[
8
]
.
T
h
is
is
an
ad
d
itio
n
al
f
ea
tu
r
e
f
o
r
th
is
co
n
f
ig
u
r
atio
n
.
T
h
e
m
o
d
u
lar
it
y
o
f
t
h
is
i
n
v
er
ter
al
lo
w
s
o
p
er
atio
n
f
o
r
h
i
g
h
v
o
ltag
e
an
d
h
i
g
h
p
o
w
e
r
ap
p
licatio
n
s
.
Usi
n
g
t
h
is
,
a
th
r
ee
p
h
ase
in
v
er
ter
cir
cu
it
h
as
b
ee
n
m
ad
e
an
d
is
co
n
n
ec
ted
to
th
r
ee
p
h
ase
in
d
u
ctio
n
m
o
to
r
[
9
]
.
Her
e
ea
c
h
p
h
ase
co
n
s
is
t o
f
a
s
ep
ar
ate
DC
li
n
k
v
o
ltag
e
s
o
u
r
ce
.
An
o
th
er
co
n
f
ig
u
r
atio
n
is
also
p
r
o
p
o
s
ed
w
it
h
a
s
i
n
g
le
co
m
m
o
n
D
C
li
n
k
v
o
ltag
e
s
o
u
r
ce
f
o
r
ea
ch
p
h
a
s
e
[
1
0
]
.
I
n
b
o
th
th
e
co
n
f
i
g
u
r
ati
o
n
s
,
th
e
in
d
u
ctio
n
m
o
to
r
d
r
iv
e
is
co
n
n
ec
ted
to
t
h
e
in
v
er
ter
cir
cu
it
an
d
t
h
e
p
er
f
o
r
m
a
n
ce
ch
ar
ac
ter
is
tics
o
f
th
e
d
r
iv
e
s
u
ch
as
s
p
ee
d
,
to
r
q
u
e
an
d
s
tato
r
c
u
r
r
en
t
ar
e
an
al
y
z
ed
.
I
n
t
h
is
t
h
e
t
w
o
co
n
f
i
g
u
r
atio
n
cir
cu
i
ts
ar
e
m
o
d
eled
b
y
u
s
i
n
g
Ma
tlab
/s
i
m
u
lin
k
s
o
f
t
w
ar
e
an
d
co
r
r
esp
o
n
d
in
g
r
es
u
lts
ar
e
d
is
p
la
y
ed
.
2.
P
RO
P
O
SE
D
3
-
P
H
ASE
M
L
I
C
I
RCU
I
T
WI
T
H
RE
D
UCED
NUM
B
E
R
O
F
SWI
T
CH
E
S
F
O
R
I
NDUC
T
I
O
N
M
O
T
O
R
AP
P
L
I
CA
T
I
O
N
S
CO
NF
I
G
UR
A
T
I
O
N
-
1
T
h
e
Fig
u
r
e
1
r
ep
r
esen
ts
th
e
cir
cu
it
d
ia
g
r
a
m
o
f
co
n
f
i
g
u
r
ati
o
n
-
1
f
o
r
a
th
r
ee
p
h
ase
h
y
b
r
id
H
-
b
r
id
g
e
elev
en
lev
el
i
n
v
er
ter
w
ith
a
s
e
p
ar
ate
DC
lin
k
v
o
lta
g
e
s
o
u
r
ce
f
o
r
an
ea
ch
p
h
a
s
e.
Fro
m
t
h
is
co
n
f
i
g
u
r
atio
n
it
i
s
o
b
s
er
v
ed
th
at,
t
h
e
to
tal
n
u
m
b
e
r
o
f
s
w
i
tch
e
s
r
eq
u
ir
ed
f
o
r
t
h
r
e
e
p
h
ases
ar
e
2
4
.
An
d
f
o
r
a
n
i
n
d
iv
id
u
al
p
h
ase
t
h
e
s
w
itc
h
co
u
n
t
is
8
o
n
l
y
.
Fo
r
th
e
s
a
m
e
elev
e
n
le
v
els
o
f
o
u
t
p
u
t
v
o
lt
a
g
es,
t
h
e
co
n
v
e
n
tio
n
a
l
ca
s
ca
d
ed
H
-
b
r
id
g
e
in
v
er
ter
to
p
o
lo
g
y
r
eq
u
ir
e
s
t
w
e
n
t
y
s
w
i
tch
e
s
f
o
r
i
n
d
iv
id
u
al
p
h
ase.
Her
e
t
h
e
s
w
itc
h
co
u
n
t
is
r
ed
u
ce
d
to
6
0
%
o
f
th
e
co
u
n
t
i
n
co
n
v
e
n
tio
n
a
l
ca
s
ca
d
ed
H
-
b
r
id
g
e
co
n
f
ig
u
r
atio
n
.
I
n
t
h
e
p
r
o
p
o
s
ed
cir
cu
it
a
t
an
y
ti
m
e
o
n
l
y
t
w
o
s
w
i
tc
h
es
ar
e
o
p
er
atin
g
to
g
e
t
th
e
d
esire
d
o
u
tp
u
t
v
o
ltag
e
le
v
el.
T
h
is
is
b
ec
au
s
e
o
f
b
id
ir
ec
tio
n
al
o
p
er
atio
n
o
f
s
w
itc
h
es
ca
u
s
ed
b
y
a
d
io
d
e
b
r
id
g
e
cir
cu
it.
T
h
e
t
h
r
ee
u
n
it
s
o
f
h
y
b
r
id
H
-
b
r
id
g
es
ar
e
co
n
n
ec
ted
,
s
u
ch
th
a
t
th
e
o
u
tp
u
t
v
o
lta
g
e
o
f
ea
ch
u
n
it
is
p
h
ase
d
is
p
lace
d
b
y
1
2
0
d
eg
r
ee
s
ea
ch
.
T
h
is
t
h
r
ee
p
h
a
s
e
v
o
lt
ag
e
i
s
g
iv
e
n
a
s
i
n
p
u
t
to
in
d
u
ctio
n
m
o
to
r
.
T
h
e
T
ab
le
1
r
ep
r
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ts
t
h
e
s
w
itc
h
i
n
g
s
eq
u
e
n
ce
o
f
a
n
ele
v
en
le
v
el
h
y
b
r
id
H
-
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r
id
g
e
M
L
I
.
Fro
m
t
h
i
s
tab
le
w
e
co
u
ld
o
b
s
er
v
e
t
h
at,
o
n
l
y
t
w
o
s
w
itc
h
es
ar
e
o
p
er
atin
g
at
a
n
y
t
i
m
e.
Fo
r
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n
s
ta
n
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n
s
id
er
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o
r
3
V
dc
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v
o
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t
h
e
s
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S
2
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d
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atin
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e
s
w
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S
3
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S
5
ar
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atin
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h
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o
r
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th
e
n
u
m
b
er
o
f
g
ate
d
r
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in
g
,
p
r
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tectio
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cu
its
a
n
d
th
e
s
tr
ess
o
n
s
w
itc
h
es a
l
s
o
d
ec
r
ea
s
e.
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