![]() It allows us to use a digital signal for measurement or control in a way. Definition: A modulation technique where the width of the pulses of the pulsed carrier wave is changed according to the modulating signal is known as Pulse. The time it takes for the signal to cycle from low to high is called the cycle duration. Pulse width modulation (PWM) is an electrical control and measurement technique. The pulses can be generated by a drive transistor or power MOSFET.Ī pulse width modulation signal occurs in cycles of high and low voltages generated by the transistor. ![]() In pulse width modulation, a high frequency train of electrical pulses is sent to the device to power it. All of that current flowing through the resistor would quickly burn it out. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion. You might be thinking, why can’t we just make a varying voltage with a potentiometer or resistor? The answer is that for applications like controlling a DC motor, a large amount of current is needed to power the motor. Pulse Width Modulation or PWM is a common technique used to vary the width of the pulses in a pulse-train. Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a processor's digital outputs. Pulse width modulation is used to simulate this varying analog voltage using a digital microcontroller or timer. But most microcontrollers are unable to generate this varying analog voltage. Projects using these devices need a varying voltage to control the position, brightness, or speed of the device. ![]() ![]() Pulse width modulation signals are commonly used to control analog devices like servos, LEDs, and DC motors. ![]()
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