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PDF AD2S105 Data sheet ( Hoja de datos )
| Número de pieza | AD2S105 | |
| Descripción | Three-Phase Current Conditioner | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Current Conditioning
Complete Vector Transformation on Silicon
Three-Phase 120° and Orthogonal 90° Signal
Transformation
Three-Phase Balance Diagnostic–Homopolar Output
DQ Manipulation
Real-Time Filtering
APPLICATIONS
AC Induction Motor Control
Spindle Drive Control
Pump Drive Control
Compressor Drive Control and Diagnostics
Harmonic Measurement
Frequency Analysis
Three-Phase Power Measurement
Three-Phase
Current Conditioner
AD2S105
FUNCTIONAL BLOCK DIAGRAM
Cosθ Sinθ
INPUT
DATA
STROBE
φ POSITION
PARALLEL
DATA
12 BITS
IS1
Cosθ
Cos (θ + 120°) IS2
IS3
Cos (θ + 240°)
Sinθ
Vds
SECTOR
MULTIPLIER
SINE AND
COSINE
MULTIPLIER
3φ-2φ
Vqs
SECTOR
MULTIPLIER
SINE AND
COSINE
MULTIPLIER
Vds'
Vqs'
BUSY
Cos θ + φ
Sin θ + φ
CONV1
CONV2
DECODE
Ia + Ib + Ic
3
HOMOPOLAR HOMOPOLAR +5V GND –5V
OUTPUT
REFERENCE
GENERAL DESCRIPTION
The AD2S105 performs the vector rotation of three-phase 120
degree or two-phase 90 degree sine and cosine signals by trans-
ferring these inputs into a new reference frame which is controlled
by the digital input angle φ. Two transforms are included in the
AD2S105. The first is the Clarke transform which computes
the sine and cosine orthogonal components of a three-phase in-
put. These signals represent real and imaginary components
which then form the input to the Park transform. The Park
transform relates the angle of the input signals to a reference
frame controlled by the digital input port. The digital input
port on the AD2S105 is a 12-bit/parallel natural binary port.
If the input signals are represented by Vds and Vqs, respectively,
where Vds and Vqs are the real and imaginary components, then
the transformation can be described as follows:
Vds' = Vds Cosφ – Vqs Sinφ
Vqs' = Vds Sinφ + Vqs Cosφ
Where Vds' and Vqs' are the output of the Park transform
and Sinφ, and Cosφ are the trigonometric values internally cal-
culated by the AD2S105 from the binary digital data φ.
The input section of the device can be configured to accept
either three-phase inputs, two-phase inputs of a three-phase
system, or two 90 degree input signals. The homopolar output
indicates an imbalance of a three-phase input only at a user-
specified level.
The digital input section will accept a resolution of up to 12 bits.
An input data strobe signal is required to synchronize the position
data and load this information into the device counters.
A two-phase rotated output facilitates the implementation of
multiple rotation blocks.
The AD2S105 is fabricated on LC2MOS and operates on
± 5 volt power supplies.
PRODUCT HIGHLIGHTS
Current Conditioning
The AD2S105 transforms the analog stator current signals (Is1,
Is2, Is3) using the digital angular signal (reference frame) into dc
values which represent direct current (Ids) and quadrature cur-
rent (Iqs). This transformation of the ac signals into dc values
simplifies the design of the analog-to-digital (A/D) conversion
scheme. The A/D conversion scheme is simplified as the band-
width sampling issues inherent in ac signal processing are
avoided and in most drive designs, simultaneous sampling of the
stator currents may not be necessary.
Hardware Peripheral for Standard Microcontroller and DSP
Systems
The AD2S105 off-loads the time consuming Cartesian transfor-
mations from digital processors and benchmarks show a signifi-
cant speed improvement over single processor designs. AD2S105
transformation time = 2 µs.
Field Oriented Control of AC Motors
The AD2S105 accommodates all the necessary functions to pro-
vide a hardware solution for current conditioning in variable
speed control of ac synchronous and asynchronous motors.
Three-Phase Imbalance Detection
The AD2S105 can be used to sense imbalances in a three-phase
system via the homopolar output.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
AD2S105
THEORY OF OPERATION
A fundamental requirement for high quality induction motor
drives is that the magnitude and position of the rotating air-gap
rotor flux be known. This is normally carried out by measuring
the rotor position via a position sensor and establishing a rotor
oriented reference frame.
To generate a flux component in the rotor, stator current is ap-
plied. A build-up of rotor flux is concluded which must be
maintained by controlling the stator current, ids, parallel to the
rotor flux. The rotor flux current component is the magnetizing
current, imr.
Torque is generated by applying a current component which is
perpendicular to the magnetizing current. This current is nor-
mally called the torque generating current, iqs.
To orient and control both the torque and flux stator current
vectors, a coordinate transformation is carried out to establish a
new reference frame related to the rotor. This complex calcula-
tion is carried out by the AD2S105.
To expand upon the vector operator a description of a single
vector rotation is of assistance. If it is considered that the
moduli of a vector is OP and that through the movement of ro-
tor position by , we require the new position of this vector it
can be deduced as follows:
Let original vector OP = A (Cos + jSIN ) where A is a
constant;
if OQ = OP ej⌽
and: ej⌽ = Cos + jSin
(1)
OQ = A (Cos ( + ) + jSin ( + ))
= A [Cos Cos φ – Sin Sin φ + jSin Cos φ + jCos Sin φ]
= A [(Cos + jSin ) (Cos + jSin )]
(2)
a
Q
θ+φ
φ
P
θ
d
O
To relate these stator current to the reference frame the rotor
currents assume the same rectangular coordinates, but are now
rotated by the operator ej, where ej = Cos + jSin .
Here the term vector rotator comes into play where the stator
current vector can be represented in rotor-based coordinates or
vice versa.
The AD2S105 uses ej as the core operator. In terms of the
mathematical function, it rotates the orthogonal ids and iqs com-
ponents as follows:
ids' + jiqs' = (Ids + jIqs) ej
where ids', iqs' = stator currents in the rotor reference frame. And
ej = Cos + jSin
= (Ids + jIqs)(Cos + jSin )
The output from the AD2S105 takes the form of:
ids' = Ids Cos – Iqs Sin
iqs' = Ids Sin + Iqs Cos
The matrix equation is:
[ ] [ ] [ ]ids' = Cos – Sin
iqs' Sin Cos
Ids
Iqs
and it is shown in Figure 2.
φ
Ids Ids'
ejφ
Iqs Iqs'
Figure 2. AD2S105 Vector Rotation Operation
INPUT CLARK
COSθ COSθ + 120° COS θ + 240° SIN θ
3φ TO 2φ
TRANSFORMATION
Figure 1. Vector Rotation in Polar Coordinate
The complex stator current vector can be represented as is = ias
+ aibs + a2ics where a = e
j 2π and a2 = e
3
j 4π . This can be re-
3
placed by rectangular coordinates as
is = ids + jiqs
(3)
In this equation ids and iqs represent the equivalent of a two-
phase stator winding which establishes the same magnitude of
MMF in a three-phase system. These inputs can be seen after
the three-phase to two-phase transformation in the AD2S105
block diagram. Equation (3) therefore represents a three-phase
to two-phase conversion.
DIGITAL
φ
LATCH
LATCH
LATCH
SINE AND
COSINE
MULTIPLIER
(DAC)
SINE AND
COSINE
MULTIPLIER
(DAC)
COS ( θ + φ)
SIN ( θ + φ)
PARK
Figure 3. Converter Operation Diagram
REV. 0
–5–
5 Page 
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
44-Lead Plastic Leaded Chip Carrier (P-44A)
0.048 (1.21)
0.042 (1.07)
0.048 (1.21)
0.042 (1.07)
6
7
PIN 1
IDENTIFIER
TOP VIEW
0.056 (1.42)
0.042 (1.07)
40
39
0.180 (4.57)
0.165 (4.19)
0.025 (0.63)
0.015 (0.38)
0.021 (0.53)
0.013 (0.33)
0.63 (16.00)
0.59 (14.99)
0.032 (0.81)
0.026 (0.66)
0.020
(0.50)
R
17
18
0.656 (16.66)
0.650 (16.51) SQ
0.695 (17.65)
0.685 (17.40) SQ
29
28
0.050
(1.27)
BSC
0.040 (1.01)
0.025 (0.64)
0.110 (2.79)
0.085 (2.16)
AD2S105
REV. 0
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD2S105.PDF ] | |
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