For the ease of understanding let us consider a 5V PWM signal, in this case the PWM signal will either be 5V (high) or at ground level 0V (low). That is, at any given instance of time the wave will either be high or will be low. The signal thus produced will have a train of pulses and these pulses will be in form of a square wave. But, for now understand PWM as a type of signal which can be produced from a digital IC such as microcontroller or 555 timer.
PWM stands for Pulse Width Modulation we will get into the reason for such a name later. In this article we will learn about what is PWM, PWM signals and some parameters associated with it, so that we will be confident in using them in our designs. A PWM can be considered as an exact opposite of it, PWM is used to produce Analog signals from a digital device like microcontroller. In our previous article we learnt about ADC, while ADC is used to read Analog signals by a digital device like microcontroller. Apart from this, PWM signals are also used for driving Servo motors and also for other simple tasks like controlling the brightness of a LED. In order to control such power electronic switches we commonly use something called PWM signals (Pulse Width Modulation). These switches are nothing but Power electronic devices like MOSFET, IGBT, TRIAC etc. One thing that is common in all these circuits is that it consists of many electronic switches inside it.
Inverters, Converters, SMPS circuits and Speed controllers.
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