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Analog Model for Stability Analysis of Power Factor Correction Switching Converters

IP.com Disclosure Number: IPCOM000119697D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Kelkar, S: AUTHOR

Abstract

Switching converter power processors for power factor correction are assuming greater importance and are being used in many systems. The boost topology switching converter can be used as a preprocessor to improve input power factor; disclosed is an analog model that facilitates the stability analysis of such circuits. An important feature of the model is the ability to easily include the input filter in order to study its effects. This model has all of the features of earlier models [1] and leads to a simulation technique characterized by ease of use, flexibility, generality and accuracy.

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Analog Model for Stability Analysis of Power Factor Correction Switching
Converters

      Switching converter power processors for power factor
correction are assuming greater importance and are being used in many
systems.  The boost topology switching converter can be used as a
preprocessor to improve input power factor; disclosed is an analog
model that facilitates the stability analysis of such circuits.  An
important feature of the model is the ability to easily include the
input filter in order to study its effects.  This model has all of
the features of earlier models [1] and leads to a simulation
technique characterized by ease of use, flexibility, generality and
accuracy.

      Fig. 1 shows the power stage of a typical boost topology
switching converter with input filter.  The input filter could have a
significant effect on system stability because its output impedance
peaks at the filter resonant frequency.  This peaking effect could
cause a significant reduction in loop gain and phase margin, even
instability if the impedance reaches a high value.  A very efficient
way of studying this problem is to use analog models for the power
stage 1; this allows the user to also try out other input filter
topologies and ways of mitigating the input filter interaction with
the regulator system.

      The state space averaging technique 2,3 is used to develop two
equivalent nonlinear equations that describe circuit behavior over a
complete cycle for both modes of operation.  The key step is the
synthesis of an equivalent circuit that should retain as much as
possible of the actual circuit topology so as to make it easy to use...