Fractional Describing Function Analysis of PWPF Modulator

Table 1

Static characteristic variables of PWPF modulator.

On time	𝑇on=−𝑇𝑚ℎln1−𝑈on−𝐾𝑚(𝐶−𝑈)
Off time	𝑇off=−𝑇𝑚ℎln1−𝐾𝑚𝐶−𝑈off
Modulator frequency	1𝑓=𝑇on+𝑇off
Duty cycle	𝑇DC=^on𝑇on+𝑇off
Equivalent internal deadband	𝐶𝑑=𝑈on𝐾𝑚
Equivalent internal saturation level	𝐶𝑠𝑈=1+^off𝐾𝑚