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AN-1090 Datasheet(PDF) 4 Page - International Rectifier

Part # AN-1090
Description  Controller Dynamics and Tuning
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

AN-1090 Datasheet(HTML) 4 Page - International Rectifier

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AN-1090
Based on the pole-zero cancellation technique, the controller gains are evaluated by:
B
A
gBW
Re
Current
L
K
q
plreg
=
B
A
T
2
gBW
Re
Current
R
K
5
xlreg
=
Where A and B are the internal digital controller scaling (A*B = .006016) and T is the controller
sampling time introduced for sampling compensation.
The following gain calculation illustrates a drive application setup with Parameter configurator
entries shown below:
The current regulator gains are calculated as:
9973
006016
.
0
1500
04
.
0
K
plreg
=
=
9973
006016
.
0
1500
04
.
0
K
D
_
plreg
=
=
4867
006016
.
0
0001
.
0
2
1500
1
.
6
K
5
xlreg
=
=
The current controller in the Sensorless FOC block module directly uses these gains.
MCE designer provides current loop diagnostic test function. This test provides the response of
the current control loop and also the steady state accuracy.


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