Q3 1000-2000A
24
Current controller - PI loop circuit
Bridge 1
Bridge 2
for a positive command value
Bridge 1
negative R14, C80
Bridge 2
positive
R33, C81
Basic set-up
Amplification
~
0.4
Integration time
~
18m
Changing the amplification
Bridge1
Bridge 2
Cha
nging the inte-
gration time
Brid
ge 1
Bridge 2
Optimization of the current controller
- Connect an oscilloscope across the current actual value
X3:21
- Current command value step-change ±1V
X3:16
C
u
rr
e
nt
co
nt
ro
lle
r
18K
1
18K
1
Bridge 1
Bridge 2
Xp=
18k
W
x R14
18k
W
+ R14
43k
W
Xp=
18k
W
x R33
18k
W
+ R33
43k
W
t
[ms]-
18k
W
x R14
18k
W
+ R14
t
[ms]-
18k
W
x R33
18k
W
+ R33
x 1µF+C81
x 1µF+C80