AD2S100

a FEATURES Complete Vector Coordinate Transformation on Silicon Mixed Signal Data Acquisition Three-Phase 120؇ and Orthogonal 90؇ Signal Transformation Three-Phase Balance Diagnostic–Homopolar Output Cosθ Cosθ Sinθ Ia Vds Ib 30-20 Ic Vqs AC Vector Processor AD2S100 FUNCTIONAL BLOCK DIAGRAM INPUT DATA STROBE φ POSITION PARALLEL DATA 12 BITS BUSY SINE AND SECTOR COSINE MULTIPLIER MULTIPLIER Va Vds' 2φ -3φ Vb Cos θ + φ Cos (θ + 120° + φ) APPLICATIONS AC Induction and DC Permanent Magnet Motor Control HVAC, Pump, Fan Control Material Handling Robotics Spindle Drives Gyroscopes Dryers Washing Machines Electric Cars Actuator Three-Phase Power Measurement Digital-to-Resolver & Synchro Conversion GENERAL DESCRIPTION Cos (θ + 120°) Cos (θ + 240°) Sinθ SINE AND SECTOR COSINE MULTIPLIER MULTIPLIER Ia + Ib + Ic 3 Vc Cos (θ + 240° + φ) Vqs' Sin θ + φ CONV1 CONV2 DECODE HOMOPOLAR OUTPUT HOMOPOLAR REFERENCE +5V GND –5V The AD2S100 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 AD2S100. 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...