How do you calculate PWM duty cycle?

Duty is literally the proportion of 1s to 0s output by the PWM command. To determine the proportional PWM output voltage, use this formula: (Duty ÷ 256) x 5 V. For example, if Duty is 100, (100 ÷ 256) x 5 V = 1.953 V; PWM outputs a train of pulses whose average voltage is 1.953 V.

What is PWM value?

Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. The duration of “on time” is called the pulse width. To get varying analog values, you change, or modulate, that pulse width.

Is PWM same as duty cycle?

A Pulse Width Modulation (PWM) Signal is a method for generating an analog signal using a digital source. The duty cycle describes the amount of time the signal is in a high (on) state as a percentage of the total time of it takes to complete one cycle.

Why do we need PWM?

Pulse width modulation is a great method of controlling the amount of power delivered to a load without dissipating any wasted power. The above circuit can also be used to control the speed of a fan or to dim the brightness of DC lamps or LED’s. If you need to control it, then use Pulse Width Modulation to do it.

Why is duty cycle needed?

The actual duty cycle is important because a slight increase in it (from the theoretical ideal efficiency value) may lead to a significant increase in the operating peak current and the corresponding magnetic fields. We thus have a more accurate estimate of duty cycle.

How does duty cycle affect power?

The ratio of the average power to the peak pulse power is the duty cycle and represents the percentage of time the power is present. In the case of a square wave the duty cycle is 0.5 (50\%) since the pulses are present 1/2 the time, the definition of a square wave. Using [4], the duty cycle is 0.000001 x 1,000 = 0.001.