Modeling Digitally Controlled PFCs Made Easy

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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Author & Publication:

Nikhilesh Kamath, ON Semiconductor, Phoenix, Ariz., How2Power Today, Dec 15 2020

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