Modeling Digitally Controlled PFCs Made Easy
by Nikhilesh Kamath, ON Semiconductor, Phoenix, Ariz., How2Power Today, Dec 15 2020
Focus:
Simulation of digitally controlled power supplies has its challenges. For example, it is
easy to lose track of the gain at various points in the system such as may occur while
converting floating-point compensator coefficients to fixed-point representation. This
article discusses how to address these types of challenges in a specific application of
digital control—power factor correction (PFC) circuits. In particular, this article serves
as a guide for designing a digital average-current-mode control scheme, a popular choice
for high-power PFC applications. This 16-page article discusses the steps involved in
modeling a 500-W average-current-mode-controlled PFC circuit using MATLAB, which features
a SPICE-like circuit solver. A switching model is simulated using power stage components
from the Simscape Electrical toolkit. The Simscape toolkit provides a convenient means to
model a physical system. Simulation results are validated experimentally.
What you’ll learn:
- How to model, in MATLAB, a 500-W PFC boost converter using digital implementation of average current mode control
- How to simulate digital control of power supplies using average-current-mode control, peak- current-mode control or voltage mode control
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