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The rectangular voltage pulses nonetheless result in a more and more smooth current waveform, as the switching frequency increases. Note that the current waveform is the integral of the voltage waveform. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being maximum power point tracking.
The longer the switch is on compared to the off periods, the higher the total power supplied to the load. Hz in audio amplifiers and computer power supplies.