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參數(shù)資料
| 型號(hào)： | AD2S100 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | AC Vector Processor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 393K |
| 代理商： | AD2S100 |
AD2S100
REV. A
–7–
Output Analog Signals
There are three forms of analog output from the AD2S100.
Sin/Cos orthogonal output signals are derived from the Clark/
three-to-two-phase conversion before the Park angle rotation.
These signals are available on Pin 25 (Cos
u
) and Pin 26 (Sin
u
), and occur before Park angle rotation.
Three-Phase Output Signals
(Cos (
θ
+
φ
), Cos (
φ
+
θ
+ 120
°
), Cos (
φ
+
θ
+ 240
°
)), where
φ
represents digital input angle. These signals are available on
Pin 7 (PH/OP1), Pin 9 (PH/OP2) and Pin 8 (PH/OP3),
respectively.
Two-Phase (Sin (
θ
+
φ
), Cos (
θ
+
φ
)) Signals
These represent the output of the coordinate transformation.
These signals are available on Pin 6 (PH/OP4, Sin (
θ
+
φ
)) and
Pin 7 (PH/OP1, Cos (
θ
+
φ
)).
HOMOPOLAR OUTPUT
HOMOPOLAR Reference
In a three-phase ac system, the sum of the three inputs to the
converter can be used to indicate whether or not the phases are
balanced.
If V
SUM
= PH/IP1 + PH/IP2 + PH/IP3 (or PH/IPH1 +
PH/IPH2 + PH/IPH3) this can be rewritten as V
SUM
= [Cos
u
, +
Cos (
u
+ 120
°
) + Cos (
u
+ 240
°
)] = 0. Any imbalances in the
line will cause the sum V
SUM
≠
0. The AD2S100 homopolar
output (HPOP) goes high when V
SUM
> 3
×
V
ts
. The voltage
level at which the HPOP indicates an imbalance is determined
by the HPREF threshold, V
ts
. This is set internally at
±
0.5 V dc
(
±
0.1 V dc). The HPOP goes high when
V
ts
<
(
Cos
θ +
Cos
(
θ +
120
°
)
+
Cos
(
θ +
240
°
))
3
×
V
where V is the nominal input voltage.
With no external components V
SUM
must exceed
±
1.5 V dc in
order for HPOP to indicate an imbalance. The sensitivity of the
threshold can be reduced by connecting an external resistor be-
tween HPOP and ground in Figure 5 where,
V
ts
=
0.5
R
EXT
R
EXT
+
20000
R
EXT
=
V
ts
= V dc.
20k
25μA
HOMOPOLAR
REFERENCE
EXTERNAL
RESISTOR
TO TRIGGER
Figure 5. The Equivalent Homopolar Reference Input
Circuitry
Example: From the equivalent circuit, it can be seen that the in-
clusion of a 20 k
resistor will reduce V
ts
to
±
0.25 V dc. This
corresponds to an imbalance of
±
0.75 V dc in the inputs.
Homopolar Filtering
The equation V
SUM
= Cos
u
+ Cos (
u
+ 120
°
) + Cos (
u
+ 240
°
)
= 0 denotes an imbalance when V
SUM
≠
0. There are conditions,
however, when an actual imbalance will occur and the condi-
tions as defined by V
SUM
will be valid. For example, if the first
phase was open circuit when
u
= 90
°
or 270
°
, the first phase is
valid at 0 V dc. V
SUM
is valid, therefore, when Cos
u
is close to 0.
In order to detect an imbalance
u
has to move away from 90
°
or
270
°
, i.e., when on a balanced line Cos
u
≠
0.
Line imbalance is detected as a function of HPREF, either set
by the user or internally set at
±
0.5 V dc. This corresponds to a
dead zone when
f
= 90
°
or 270
°
±
30
°
, i.e., V
SUM
= 0, and,
therefore, no indicated imbalance. If an external 20 k
resistor
is added, this halves V
ts
and reduces the zone to
±
15
°
. Note this
example only applies if the first phase is detached.
In order to prevent this false triggering an external capacitor
needs to be placed from HPFILT to ground, as shown in Figure
5. This averages out the perceived imbalance over a complete
cycle and will prevent the HPOP from alternatively indicating
balance and imbalance over
u
= 0
°
to 360
°
.
For
d
θ
dt
d
θ
=
1000
rpm C
EXT
=
200
nF
dt
=
100
rpm C
EXT
=
2.2
μ
F
Note: The slower the input rotational speed, the larger the time
constant required over which to average the HPOP output. Use
of the homopolar output at slow rotational speeds becomes
impractical with respect to the increased value for C
EXT
.
AD2S100
TOP VIEW
1
23
12
34
A
HPREF
HPOP
HPFILT
220nF
DGND
C
EXT
R
EXT
HPOP
GND
HPREF
Figure 6. AD2S100 Homopolar Output Connections
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