Power Electronics

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  Power Electronics is the art of changing electrical energy from one form to another in a clean, efficient, robust and compact manner for convenient utilisation. In a modern building, passenger lift equipped with a Variable-Voltage-Variable-Speed induction-machine drive that offers a comfortable ride and stops exactly at the floor level. With reduced stresses on the motor, it consumes less power and corruption of the utility mains. In mobile sets power management IC's working on Power Electronic principles, meant to handle limited milliwatts, large linear audio amplifiers are rated at a few thousand watts. Often Power electronic converters operate from the utility mains are exposed to the disturbances associated with it. The transients associated with switching circuits and faults that occur at the load point stress devices and converters. Consequently, several protection schemes must be incorporated in a converter. It is essential to protect both the control terminals and the main terminals. Power semiconductor devices are usually protected against voltage spike or over-voltage, over-current, gate-under voltage, over voltage at gate, excessive temperature rise, electro-static discharge.