ECEN5807 supplementary materials on
Introduction to Converter Sampled-Data Modeling
- Introductory slides on sampled-data modeling and DCM high-frequency example (including the derivation of frequency-domain effects of sampling)
- Sampled-data modeling of current programmed control (peak current-mode control)
MATLAB/Simulink files
- zohfr.m (MATLAB file used to plot ZOH frequency responses)
- CPMfr.m (MATLAB file used to plot control-to-inductor current responses in CPM converters)
References
- A. R.Brown and R. D.Middlebrook, “Sampled-data modeling of switching regulators,” in IEEE Power Electronics Specialists Conf. (PESC), 1981, pp. 349-369. This paper explained how PWM is a sampler in small-signal converter models.
- B. Y.Lau and R. D.Middlebrook, “Small-signal frequency response theory for piecewise-constant two-switched-network dc-to-dc converter systems,” in IEEE Power Electronics Specialists Conf. (PESC), 1986, pp. 186-200. This paper derived a complete exact small-signal model valid at all frequencies and showed that state-space averaged models are low-frequency approximations of the exact small-signal model.
- G. C.Verghese and V. J.Thottuvelil, “Aliasing effects in PWM power converters,” in IEEE Power Electronics Specialists Conf. (PESC), 1999, pp. 1043-1049. This paper discussed aliasing in PWM converters, and how small-signal modeling beyond one half of the switching frequency should be viewed with caution.
- D.Maksimovic, "Computer-Aided Small-Signal Analysis Based on Impulse Response of DC/DC Switching Power Converters," IEEE Transactions on Power Electronics, Vol.15, No.6, Nov.2000, pp. 1183-1191. This paper described how the process of deriving equivalent hold and exact small-signal models could be automated. It should be fairly easy to do this in MATLAB/Simulink environment.
- J. Sun, D. M. Mitchell, M. F. Greuel, P. T. Krein, and R. M. Bass, "Averaged Modeling of PWM Converters Operating in Discontinuous Conduction Mode," IEEE Transactions on Power Electronics, Vol.16, No.4, Jul.2001, pp. 482-492. This paper derived showed derivation of averaged DCM models where high-frequency poles and zeros are consistent with exact sampled-data models.