.Modelica.Electrical.PowerConverters.DCDC.Control.SignalPWM

Information

This controller can be used both for DC/DC and AC/DC converters. The signal input of the PWM controller is the duty cycle; the duty cycle is the ratio of the on time to the switching period. The output firing signal is strictly determined by the actual duty cycle, indicated as d in Fig. 1.

Fig. 1: Firing (fire) and inverse firing (notFire) signal of PWM control; d = duty cycle; f = switching frequency

The firing signal is generated by comparing the sampled duty cycle input with a periodic saw tooth [Williams2006] or triangular signal (carrier).

Note

The user has the choice between two comparison modes:

commonComparison = true : The result of the comparison dutyCyle > carrier is fed to fire_p, the inverse signal to fire_n.

commonComparison = false: The result of the comparison dutyCyle > carrier is fed to fire_p, the result of the comparison (1 - dutyCyle) > carrier is fed to fire_n. (The result is the same for the comparison dutyCycle > (1 - carrier), i.e. a signal shifted by 180°.)