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AD2S105AP Datasheet(PDF) 1 Page - Analog Devices |
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AD2S105AP Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 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. 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 Three-Phase Current Conditioner AD2S105 FUNCTIONAL BLOCK DIAGRAM 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 Cos φ – Vqs Sinφ Vqs' = Vds Sin φ + Vqs Cosφ Where Vds' and Vqs' are the output of the Park transform and Sin φ, 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. IS1 Vds Vqs SECTOR MULTIPLIER SINE AND COSINE MULTIPLIER INPUT DATA STROBE HOMOPOLAR OUTPUT HOMOPOLAR REFERENCE +5V GND –5V φ POSITION PARALLEL DATA 12 BITS 3 φ-2φ Cos ( θ + 120°) Cos ( θ + 240°) Sin θ Cos θ Cos θ Sin θ Cos θ + φ CONV1 CONV2 DECODE BUSY Vds' Vqs' Sin θ + φ SECTOR MULTIPLIER SINE AND COSINE MULTIPLIER Ia + Ib + Ic 3 IS2 IS3 A two-phase rotated output facilitates the implementation of multiple rotation blocks. The AD2S105 is fabricated on LC 2MOS 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. |
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