TUTORIAL 1

Sunday, June 18, 2000 at 9:00

Advanced DSP-Based Motor Control Concepts

Finbarr Moynihan, Digital Control Systems Group, Analog Devices, USA
Paul Kettle, Digital Control Systems Group, Analog Devices, USA

The aim of this tutorial is to provide an introduction to advanced digital control concepts for motor control, with particular emphasis on emerging applications in the white-goods, automotive and industrial markets. The tutorial will present an overview of the fundamental control requirements for common three-phase ac motors and will outline the performance requirements for many common variable-speed motor control applications. The tutorial will emphasize the use of Extended Kalman Estimation techniques for speed and position estimation in brushless permanent magnet motors and different techniques for sensorless vector control of ac induction motors. Finally, the tutorial will review innovative and cost-effective current sensing topologies for cost-sensitive applications. Both hardware and software engineers who work on variable-speed motor control for automotive, appliance or industrial applications will find the course informative.

TUTORIAL 2

Sunday, June 18, 2000 at 9:00

A Building-Block Approach to Switch-Mode Power Electronics, that is Pedagogical as well as Practical for Designers of DC Power Supplies, Power-Factor-Correction Circuits and Motor Drives

Ned Mohan, University of Minnesota, USA

This tutorial presents in-depth treatment of a design-oriented theory of switch-mode power electronics (from dc-dc converters to three-phase ac-motor drives), hitherto overlooked, using a true building-block approach. The generic building-block is analyzed only once, and then used systematically for any application. A general-purpose simulator (PSpice, for example) is utilized to bridge theory with design, thus avoiding complicated analysis that serves no useful purpose in practice. It is shown that the averaged model of the building-block, derived by cycle-by-cycle averaging, speeds up large-disturbance simulations by two orders of magnitude, compared to the switching model. Usefulness of this approach is illustrated by four design examples: Flyback converters with voltage-mode and peak-current-mode control, power-factor-correction circuits (PFC) with average-current-mode control, and motor drives with torque, speed and position feedback loops.

TUTORIAL 3

Sunday, June 18, 2000 at 14:00

Efficient Low Output Voltage Power Conversion Techniques

Rudy Severns, Springtime Enterprises, USA

Integrated circuits using voltages well below 5 V are now common and devices requiring voltages as low as 1 V are appearing. Efficiency, at an acceptable cost, has long been a problem with 5 V power supplies. Lowering the voltage, while maintaining the power level, makes the efficiency-cost trade-off even more difficult. This half-day tutorial presents a comprehensive review of the problems, tradeoffs, design solutions and inherent limits of low voltage power supplies. The material is very practical and can be immediately applied by the student to modify existing designs and to create new designs.

TUTORIAL 4

Sunday, June 18, 2000 at 14:00

Status of the Techniques of Three-Phase PWM Rectifier Systems with Low Effects on the Mains

Johann W. Kolar, Dept. of Electrical Drives and Machines, TU Vienna, Austria

This practice-oriented tutorial gives an in-depth introduction to all important aspects of the evaluation, analysis and design of three-phase power factor correction (PFC) systems. Starting with a review, classification and brief description of all relevant three-phase converter topologies which have been proposed in the literature during the last decade, the basic principle of operation of selected systems will be discussed in detail using phase quantities and space vector calculus. Advantages and drawbacks of single-stage and two-stage isolated AC/DC power conversion will be clarified. Characteristic quantities facilitating the evaluation of various concepts for a given application will be defined. Furthermore, modulation methods, control-oriented behaviour, different controller concepts and the controller design for buck-type and boost-type systems will be treated. Also, a simple concept for determining the stresses on the power components will be proposed and the procedure for dimensioning a three-phase PWM rectifier system will be discussed. In connection with this, the status of different power semiconductor technologies, cooling concepts and packaging techniques will be treated and guidelines for selecting the optimal switch for a different input voltage and power levels will be given. Further important points will be a comparative evaluation of high power telecommunications power supply modules concerning power density, efficiency and volume and measures for guaranteeing electromagnetic compatibility by differential-mode and common-mode filtering. Finally, the advantages and drawbacks of various simulation tools for application in system design will be discussed and laboratory models of novel PWM rectifier topologies will be shown. Also, alternative concepts for power factor improvement like active filters and other new developments in the field will be treated.

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