A Unified Discrete Model for PWM Switching DC to DC Converters with Current-Mode Control

Publisher:
Engineers Media for Engineers Australia
Publication Type:
Journal Article
Citation:
Australian Journal of Electrical & Electronic Engineering, 2008, 4 (1), pp. 63 - 72
Issue Date:
2008-01
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This paper presents a unified discrete model for pulse-width modulated (PWM) switching DC to DC converters. The major achievement is that, without any topology modification, the proposed model can be used for performance analysis of the buck, boost and buck-boost converters with any of the two current-mode controls: peak current-mode control and average current-mode control. Three important factors are considered: parasitical effects of circuit elements, non-linear inductance dependent on the current flowing through it, and control time delay, such that the accuracy of performance prediction is greatly improved. Magnetic field finite element analysis (FEA) is conducted to calculate the non-linear differential inductance. By implementing the proposed model into Matlab/Simulink, a simulation model is built. The model has been used for the performance analysis of an existing flyback converter with the peak current-mode control. The simulation results are in good agreement with the actual performance, validating the proposed model.
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