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13.5 Tuning the Control Loop Using GUI Design
The GUI is equipped with 3 different ways to program the UCD3138 digital control-loop compensator.
Table 10
lists the three options, (a) complex zeros using K
and f
; (c) device PID using K
p
In option (c), the compensator is described by device PID. In this context, K
register values used to configure the positions of the poles and zeros of the compensator. SC is a gain
scaling term. Although SC is normally set to zero, it provides additional gain for situations where the
power-stage gain is low. PRD is used to configure the minimum operating period, and KCOMP is used to
configure the maximum operating period. In the context of the compensator they are gain terms modifing
the overall transfer function by a fixed value. Knowing the proper way to configure PRD and KCOMP
varies based on the control topology implemented is important.
System Name
Complex zeros
(K
, ƒ
, Q
, ƒ
0
z
z
p
Real zeros
(K
, ƒ
, ƒ
, ƒ
0
z1
z2
Device PID
(K
, K
, Kd, α)
p
i
14
Firmware Development for Phase-Shifted Full-Bridge Power Converter
Please contact TI for additional information regarding the UCD3138 firmware development for a digital
phase-shifted full-bridge converter control.
15
References
1. UCD3138 Datamanual, Highly Integrated Digital Controller for Isolated Power (SLUSAP2)
2. UCD3138CC64EVM-030 Evaluation Module and User's Guide, Programmable Digital Power Controller
Control Card Evaluation Module (SLUU886)
3. Reference Guide, UCD3138 Digital Power Peripherals Programmer's Manual (SLUU995)
4. Reference Guide, UCD3138 Monitoring and Communications Programmer's Manual (SLUU996)
5. Reference Guide, UCD3138 ARM and Digital System Programmer's Manual (SLUU994)
6. User's Guide, UCD3138 Isolated Power Fusion GUI, (please contact TI)
SLUUAK4 – August 2013
Submit Documentation Feedback
Firmware Development for Phase-Shifted Full-Bridge Power Converter
, K
, K
, and α.
p
i
d
Table 10. Programming Digital Control Loop
)
)
p
æ
´
+
´
ç
1000
K
K
ç
p
i
è
Copyright © 2013, Texas Instruments Incorporated
, f
, Q
, and f
0
z
z
Transfer Functions
2
s
+
´ p ´
(
)
2
2
´ p ´
2
ƒ
z
æ
s
´
ç
ç
´ p ´
´ p ´
2
K
2
è
0
æ
ö æ
s
+
´
ç
1
÷ ç
´ p ´
2
ƒ
è
ø è
z1
æ
s
´
ç
ç
´ p ´
´ p ´
2
K
2
è
0
-
-
1
1
+
-
1 z
1 z
+
´
K
d
-
-
-
1
8
1
-
- a ´
´
1 z
1
2
z
; (b) real zeros using K
p
, K
, K
and α are the raw
p
i
d
s
+
1
´
ƒ
Q
z
z
ö
s
+
÷
1
÷
ƒ
ø
p
ö
s
+
1
÷
´ p ´
2
ƒ
ø
z2
ö
s
+
÷
1
÷
ƒ
ø
p
ö
-
-
sc
19
´
´
´
´
÷
2
KCOMP 2
÷
2
ø
Using the UCD3138PSFBEVM-027
, f
, f
,
0
z1
z2
1
(
)
4
´
+
PRD 1
51
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