To day power electronics has evolved thanks to solid state devices of small dimensions, high efficiency, good reliability and high mechanical strength.
These last devices form the base of the most important circuits that perform the control of the power supplied by the mains to the actuator in the automatic control systems. In short these devices are classified as follows:
• uncontrolled ac/dc converters (rectifiers)
• controlled ac/dc converters
• controlled ac/ac converters
• dc/dc converters (choppers)
• dc/ac converters (inverters)
