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Title:Modeling and simulating switching power converters
Author(s):Silva, Sergio
Contributor(s):Hanumolu, Pavan K.
dc-dc converter
loop compensation
average model
Abstract:Different modeling and simulation techniques are presented for switching power converters. It is important to achieve an excellent loop compensation to reach high performance and efficiency, but the difficulty comes from modeling due to the nonlinear switching behavior. Techniques involve linearizing switching power converters to derive their small-signal transfer functions and to construct their average model. The small-signal transfer functions can be quickly modeled in MATLAB but deriving or obtaining the transfer functions can be a tedious process, and designers often wish to verify their design in a circuit simulator such as Spectre. The average model is an equivalent circuit of its power converter that can be simulated and has low simulation time since it does not involve any switching and represents the average DC value of the voltage and current waveforms. To properly represent the nonlinear switching behavior, PSS (periodic steady-state), PAC (periodic small-signal), and PSTB (periodic stability) are simulation analyses found in SpectreRF, and they can extract the open and closed-loop frequency responses from the switching transient simulation. The periodic analyses provide a more accurate frequency response across wider frequencies at the cost of increased simulation time compared to the linearized techniques.
Issue Date:2018-05
Date Available in IDEALS:2018-05-24

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