EPS RS 232 - UIR Mode Controller Structure; PID Controller Parameters

Controller
The output signal is limited to the voltage set point. The current set point of the power supply is permanently set to
I
soll
. In UIR mode the voltage is regulated while the current is fixed.
C ONTROLLER PARAMETERS
common differential equation of a PID controller:
E Controller deviation
Kp Proportional coefficient
Tn Reset time
Tv Derivative time
Since the digital controller is a discrete-time system, the integral is replaced by a summation and the differential by a
difference:
The following equation puts the controller into practice within the software:
Parameters P, I and D are calculated as follows:
Controller parameters can be programmed via digital interface using the command
REGLER .
Ts Sampling time
Ts Sampling time = 300 us
( )






⋅
∫
dt
de
Tv+dtte
Tn
+eKp=y
1
y= 0,1Pe
i
+0,001I
∑
m
=
−
∞
m=i
e
m
+0,1D(e
i
− e
i−1
)
P= 10Kp I=
1000

Kp

Ts
Tn
D=
10

Kp

Tv
Ts
( )






−
−
−∞
∑
1ii
i=m
=m
mi
ee
Ts
Tv
+e
Tn
Ts
+eKp=y