2020 Microchip Technology Inc.
DS50002997A-page 16
PLECS MODEL
QUICK START GUIDE
FOR VIENNA PFC
Chapter 5. Model Configurations
PLECS allows a model block to be associated with multiple schematics or
configurations. In PLECS, blocks are referred to as subsystems and subsystems with
multiple configurations are referred to as configurable subsystems. Configurable
subsystems are used for the Front-End Input, Power Stage, and Controller stages. The
model is setup with the EMI Filter, Power Stage with Thermal Model, and Steady-State
Model configurations as the default.
5.1
FRONT-END INPUT
The front-end input default configuration is an EMI filter. This contains the passive
elements of the filter as well as voltage and current sensing points. Alternatively, to
reduce the simulation time by nearly 30%, the user may select Input Sense. The Input
Sense configuration does not contain any passive elements, it only has voltage and
current sensing points. Therefore, using the Input Sense configuration does not result
in accurate electrical and thermal losses as compared to the EMI filter. However, it does
allow one to evaluate the controller behavior or have a reasonable estimate of the
switch losses.
Double-click the block highlighted below to select between configurations.
FIGURE 5-1:
Front-End Input.