Today, Power Electronics has evolved from static converter technology into a
significant field within electrical engineering and electronics.
Using power semiconductors, power electronics performs such functions as switching,
controlling and converting of electrical energy with the greatest possible efficiency.
One area of application for power electronics is drive technology. Here. speed variable
DC and three-phase four-quadrant drives can easily be realized using modern power
electronics. As a result 01 this development, we can no longer imagine industry,
workshop tools, commercial enterprises and household appliances without thyristor
speed control units, smooth-starting circuits, frequency converters, servo drives
etc. And, of course. the model behind the entire system, is the circuitry used in
industrial applications.