What is the use of pulse width modulation

PWM - pulse width modulation

English: pulse width modulation (PWM), pulse time modulation (PTM) or pulse duration modulation (PDM).

Pulse width modulation, or PWM for short, is also known as pulse width modulation (PBM), pulse duration modulation (PDM), pulse length modulation (PLM) or undershoot method.

PWM is a digital type of modulation in which a technical variable (e.g. electrical voltage) changes between two values. A square pulse is modulated at a constant frequency, the width, width or length of which varies. The ratio between pulse and pause is called the duty cycle.

Pulse width modulation (PWM) is mainly used in control and regulation technology.

With pulse duration modulation, the modulated signal has a fixed amplitude. For this, the pulse duration depends on the amplitude of the information signal. The more positive the information signal, the longer the pulse lasts. The more negative the information signal, the shorter the pulse.

Application of PWM

Although the pulse width modulation signal is an alternating voltage or rather mixed voltage, it can be used to regulate the output of direct current consumers such as light emitting diodes, motors, heating resistors and the like. Instead of controlling these parts and components via the level of the operating voltage, the voltage or current is simply interrupted for a short time using pulse width modulation. This creates a certain relationship between voltage pulses and pauses. The ratio determines the effective voltage.

Example: If the ratio between pulse and pause corresponds to 50% each, the result is an effective voltage of 6 V with a pulse voltage of 12 V.

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