ABSTRACT Average models that run on general purpose circuit simulators, can help to understand the large signal and small signal behavior of switch mode systems, and can assist in the design and trimming of the power stage and controller. The objective of the proposed seminar is to present a unified methodology for average modeling and simulation of Active Power Factor Correction (APFC) systems and to demonstrate its use in analysis and design. The introductory part of the seminar covers the basics of the Generalized Switch Inductor Model (GSIM). In the following section, the seminar will introduce new behavioral models of APFC systems operating in continuous, discontinuous and borderline current modes. Both control methods with and without sensing of input voltage will be presented. It will be shown how these large signal models can be used, as is, to obtain the large signal as well as the small signal responses. It will also be demonstrated how the models can be easily applied to obtain the inner and outer loopgain of the APFC stages. The seminar will discuss in details the application of the models in the analysis and design of APFC systems including the synthesis of phase compensation networks to meet bandwidth and phase margin requirements.
Computer Aided Analysis and Design
of Single Phase APFC
Stages
Instructors: Prof. Sam BenYaakov,
BenGurion University
Outline
1. Overview of simulation methods 10min. 2. The averaging methodology 40min. 2.1. Duty Cycle Generator (DCG) 2.2. Large and small signal analyses 2.3. Examples 3. Continuous Conduction Mode (CCM) APFC stages 3.1. Classical (Unitrode) method 40min. 3.1.1. Behavioral model derivation 3.1.2. Large signal analysis 3.1.3. Input current spectrum analysis 3.1.4. AC analysis 3.1.4.1. Operating point derivation 3.1.4.2. Current loop gain and transfer function derivation 3.1.4.3. Voltage loop gain and transfer function derivation 3.1.4.4. Analyzing results using Bode plot, Nyquist plot and Nichols chart 3.2. Method with no sensing of input voltage 30min. 3.2.1. Principle of operation 3.2.2. Large signal analysis 3.2.3. AC analysis 3.2.3.1. Operating point derivation 3.2.3.2. Current and voltage loop analysis 4. Critical Conduction Mode APFC stages 4.1. Classical (Two control loops) method 25min. 4.1.1. Behavioral model derivation 4.1.2. Large signal analysis 4.2. Method with no sensing of input current 25min. 4.2.1. Behavioral model derivation 4.2.2. Large signal analysis 5. Conclusions and Q&A 10min.

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