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AD2S105

Analog Devices
Part Number AD2S105
Manufacturer Analog Devices
Description Three-Phase Current Conditioner
Published Mar 23, 2005
Detailed Description a FEATURES Current Conditioning Complete Vector Transformation on Silicon Three-Phase 120° and Orthogonal 90° Signal Tra...
Datasheet PDF File AD2S105 PDF File

AD2S105
AD2S105

Overview
a 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 Cos θ Sinθ Cos θ Cos ( θ + 120 °) Cos ( θ + 240 °) Sinθ IS1 IS2 3φ-2 φ IS3 Vqs Vds Three-Phase Current Conditioner AD2S105 FUNCTIONAL BLOCK DIAGRAM INPUT DATA STROBE φ POSITION PARALLEL DATA 12 BITS BUSY SECTOR MULTIPLIER SINE AND COSINE MULTIPLIER Cos θ + φ Vds' SECTOR MULTIPLIER SINE AND COSINE MULTIPLIER Vqs' Sin θ + φ CONV1 CONV2 DECODE Ia + Ib + Ic 3 HOMOPOLAR REFERENCE +5V GND –5V HOMOPOLAR OUTPUT GENERAL DESCRIPTION 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 The AD2S105 performs the vector rotation of three-phase 120 degree or two-phase 90 degree sine and cosine signals by transferring 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 input.
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 a...


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