
SimplIQ Software Manual 13BFilters
MAN-SIMSW (Ver. 1.4)
14-5
14.1.2 Scheduled Link (Type 26)
Only one block of this type can be used.
The basic continuous-time second-order element is the unity DC gain filter:
)()()(
)()()(
)(
)(
2
2
kDskCskE
kBskAskE
kB
kD
++
++
⋅
The index k is the gain scheduler selector: It selects one set of (A, B, C, D, E) from the 63
possible selections [A(1), B(1), C(1), D(1), E(1)…A(63), B(63), C(63), D(63), E(63)].
The discrete equivalent form is similar to that of the unscheduled block:
)()(
)()()(
21
2
21
2
0
kazkaz
kbzkbzkb
++
++
Order Parameter Description Comment
1
k
1
(k)
b
0
(k) + b
1
(k) + b
2
(k) Float, represented by a long value
2
k
2
(k)
-(b
1
(k) + b
2
(k)) Float, represented by a long value
3
k
3
(k)
-b
2
(k) Float, represented by a long value
4
k
4
(k) a
2
(k)
Float, represented by a long value
Table 14-7: Scheduled Link Parameters
The DC gain of this block is unity.
For more details about gain scheduling, refer to section
15.3.
14.2 Examples of Filter Implementation
The following examples illustrate how the more common filter links can be implemented.
Each example calculates the parameters b
0
, b
1
, b
2
, a
1
and a
2
. Use Table 14-6 to convert them
to k
1
, k
2
, k
3
and k
4
.
Note that the frequency response of a discrete-time filter depends on the sampling time. In
the following examples, you should use sampling time T.
Filter Sampling Time Comment
Speed controller high-order filter
WS[28] x 10
-6
Speed controller sampling time
Position controller high-order
filter
WS[55] x 10
-6
Position controller sampling time
Analog position sensor filter
WS[55] x 10
-6
Position controller sampling time
Analog reference to speed
controller
WS[28] x 10
-6
Speed controller sampling time
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