Abstract
This chapter revisits the main aspects of analysis and modeling techniques for switched-mode power converters. It reviews averaged small-signal modeling in details, highlighting the main assumptions behind the approach. This prepares the background necessary to understand the limitations of the averaged small-signal modeling in the context of digital control design and to allow subsequent developments of discrete-time models where these limitations are removed. The chapter commences with a brief review of pulse width modulated (PWM) dc-dc converters and then presents a summary of steady-state analysis and modeling techniques. It then explains the need for dynamic modeling in the design of control loops around switched-mode power converters and introduces the small-signal averaged modeling approach. Further, the method of state-space averaging, a general approach to modeling switched-mode power converters, is summarized. After presenting some analog control design examples, the chapter discusses the nature of duty cycle, the control variable in PWM converters.
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