Simulation of switch-mode power supplies

Pao Yue-kong Library Electronic Theses Database

Simulation of switch-mode power supplies


Author: Yung, Tak-keung
Title: Simulation of switch-mode power supplies
Degree: M.Sc.
Year: 1997
Subject: Switching power supplies
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: x, 119 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: This dissertation describes the philosophies of small signal analysis of Switch-Mode Power Supplies (SMPS) simulation, which include the introduction of switch-mode power supplies, difficulties and deficiencies of behavior model simulation, steady state analysis and the proposed small signal a.c. analysis algorithm for the switch-mode power supplies. The traditional approaches to do the small signal analysis of SMPS are to re-model the high frequency switching module with an equivalent circuit which has ignored many parasitic and nonlinearity of the circuit and cause inaccurate simulation result. Apart from this, different models may be required for different circuits or different operating modes of SMPS. The proposed small signal analysis algorithm can predict small signal response of the circuit accurately at interested frequency by full circuit simulation. This algorithm can analyze any kind of power converter or any mode of their operation without re-modelling the circuit. This analysis method is based on the steady state analysis of this full circuit. With very little extra cost and the use of time varying transfer function of the power converter, an accurate small signal response can be obtained. This algorithm has been implemented in VSPICE which is a SPICE like general purpose circuit simulation program running on UNIX system. To analyze the small signal response for a SMPS circuit, only a VSPICE netlist is needed to perform the small signal analysis of SMPS. Experimental results are presented which verify the simulated result. These results are much more accurate than the classical approaches.

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