AD2S105

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 Pa...