Simulink Control Design™ - MathWorks

Configure Models with Pulse Width Modulation (PWM)

Signals

This example shows how to configure models that use Pulse Width Modulation (PWM)

input signals for linearization. For linearization, specify a custom linearization of the

subsystem that takes the DC signal to be a gain of 1.

Many industrial applications use Pulse Width Modulation (PWM) signals because such

signals are robust in the presence of noise.

The next figure shows two PWM signals. In the top plot, a PWM signal with a 20% duty

cycle represents a 0.2 V DC signal. A 20% duty cycle corresponding to 1 V signal for 20%

of the cycle, followed by a value of 0 V signal for 80% of the cycle. The average signal

value is 0.2 V.

In the bottom plot, a PWM signal with an 80% duty cycle represent a 0.8 V DC signal.

For example, in the scdpwm model, a PWM signal is converted to a constant signal.

2 Linearization