Unipolar current controller
VDD
30V
4
R16
1
D1
BAT85
5 Vpk
20 Hz
0°
R15
600kΩ
U2
IRFP2907
R2
10kΩ
V3
U1A
3
2
11
1kΩ
LM324AD
C1
R12
100pF
100kΩ
L1
1mH
C5
0.2nF
V1
24 V
R1
0.35Ω
R11
5kΩ
R3
200Ω
I1
-0.0005 A/A
multisim 11.0 circuit sch
Bipolar current controller
VDD
VDD
30V
30V
U2
IRFP2907
R2
4
R16
1kΩ
U1A
1kΩ
4
7
2
11
LM324AD
V2
R15
600kΩ
C1
R12
100pF
100kΩ
15V
R7
3kΩ
R8
10kΩ
R11
5kΩ
Q5
L1
R1
1mH
0.35Ω
C5
0.2nF
U6
U5
IRFP2907 IRFP2907
D2
D4
6
11
V2
15V
R9
3kΩ
Q6
MMJT9410
R3
200Ω
C2
100kΩ
10pF
R10
10kΩ
MMJT9410
I1
-0.0005 A/A
R6
10kΩ
V4
15V
7 1
V3 8 U3
R5
6
R17
10kΩ
2
10kΩ
OP07AH
4
Vs
-15V
LM324AD
R13
DIODE_VIRTUAL
DIODE_VIRTUAL
3
V1
24 V
U1B
5
1
D1
BAT85
5 Vpk
20 Hz
0°
R4
3
10kΩ
V3
U4
IRFP2907
multisim 11.0 circuit sch
D3
BAT85
R14
5kΩ
sine reponse
turn on and turn off at 30A current
crossover distortion
yellow, actual current. blue,set current
current signal:100mV/A
SCH
PCB
Quote from Matthias Taglieber's PHD thsis
At first quad coil has 40A current while comp coil has no current,
second we ramp up(in programmed curve) the current in comp coil
until comp coil is in series with quad coil.