Power electronics is the applications of solid-state electronics for the control and conversion of electric power.
Power electronic converters can be found wherever there is a need to modify the form of electrical energy (i.e modify its voltage, current or frequency). The power range of these converters is from some milliwatts (as in a mobile phone) to hundreds of megawatts (e.g in a HVDC transmission system). With "classical" electronics, electrical currents and voltage are used to carry information, whereas with power electronics, they carry power. Thus, the main metric of power electronics becomes the efficiency.
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