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State-space average modelling of converters with parasitics and storage-time modulation

Polivka, W. M. and Chetty, P. R. K. and Middlebrook, R. D. (1980) State-space average modelling of converters with parasitics and storage-time modulation. In: 1980 IEEE Power Electronics Specialists Conference. IEEE , Piscataway, NJ, pp. 119-143.

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The State-Space Averaging approach to modelling switching converter power stages is used to extend the analytical descriptions of the buck, boost, buck-boost, and Cuk converters to included the effects of all parasitic resistances and transistor storage-time modulation. The analysis reveals for the first time a new and unexpected term in the line to ouput response of the Cuk converter. The new term contains a right half-plane zero produced by the energy transfer capacitance in combination with the duty-ratio-weighted sum of the on-resistances of the transistor and diode plus a non-dissipative ac resistance term due to transistor storage-time modulation. The conventional circuit model of the converter is modified to include the effects of the new term. The improved model permits an eas physical interpretation of the new zero, which has been observed only the in Cuk converter. An extended analysis of storage-time modulation in bipolar transistor switches shows that the ac small-signal performance of a switching converter is highly dependent on the nature of the base drive. It is demonstrated that storage-time modulation in conjunction with a proportional base drive can produce instability in switching converters, even open-loop. The results of these analyses are verified experimentally and their impacts on practical converters are discussed.

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Additional Information:© 1980 IEEE. Acknowledgement is gratefully made of the assistance of Billy Lau and Kwok Kee Ho, graduate students in the Power Electronics Group at the California Institute of Technology, in constructing the hardware and producing the experimental results used to study the effects of storage-time modulation presented in Sections 2.2 and 7.2.
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Official Citation:Polivka, W.M.; Chetty, P.R.K.; Middlebrook, R.D., "State-Space Average modelling of converters with parasitics and storage-time modulation," Power Electronics Specialists Conference, 1980. PESC. IEEE , vol., no., pp.119,143, 16-20 June 1980 doi: 10.1109/PESC.1980.7089440
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58661
Deposited On:29 Jun 2015 20:31
Last Modified:10 Nov 2021 22:08

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