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Topics in multiple-loop regulators and current-mode programming

Middlebrook, R. D. (1985) Topics in multiple-loop regulators and current-mode programming. In: 1985 IEEE Power Electronics Specialists Conference. IEEE , Piscataway, NJ, pp. 716-732.

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Some general considerations about multiple-loop feedback are discussed, and it is concluded that incorporation of a current-programmed power stage into a "new" power stage model is both justified and useful. A new circuit-oriented model of the current feedback path is derived which augments the well-known power stage canonical circuit model. The current loop gain, though wideband, is always stable if the conventional stabilizing ramp is employed, but has a relatively small low-frequency value. Consequently, the "new" power stage is more usefully modelled by a y parameter model in which the current loop is not explicit. Expressions for the y parameters are given that are extensions of those previously derived. Although current-programming tends to make the power stage output behave as a current source, the control to output voltage transfer function exhibits, in addition to the familiar dominant pole, a second pole at the current loop gain crossover frequency, which may lie from one-sixth to two-thirds of the switching frequency.

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Additional Information:© 1985 IEEE. This work was conducted under the Power Electronics Program supported by grants from the General Telephone Company and Emerson Electric Company, and under contracts from IBM Tucson and San Jose, and the McDonnell Douglas Astronautics Company.
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General Telephone CompanyUNSPECIFIED
Emerson Electric CompanyUNSPECIFIED
McDonnell Douglas AstronauticsUNSPECIFIED
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66048
Deposited By: Kristin Buxton
Deposited On:12 Apr 2016 23:13
Last Modified:10 Nov 2021 23:52

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