NDLI: Robust current mode control of switching DC-DC converters

Content Provider	IEEE Xplore Digital Library
Author	Ojo, O. Radman, G.
Copyright Year	1990
Description	Author affiliation: Dept. of Electr. Eng., Tennessee Technol. Univ., Cookeville, TN, USA (Ojo, O.; Radman, G.)
Abstract	Summary form only given. The authors propose an approach that results in a controller and filter design that is optimal and robust and in which the interacting effects (coupling) of the filter and the controller are used as extra degrees of freedom in the selection of the controller gains and filter components. In particular, the controller and filter design methodology is based on a linear quadratic formulation that accounts for the different constraints on design specifications. The resulting controller structure has the following components: (1) feedforward gains that provide anticipative response control to all nonexciting and limited-time-exciting commands and disturbances in the input voltage and that also alter the zeros of the resulting closed-loop system; (2) a servocompensator positioned in the forward loop path of the converter model to ensure asymptotic tracking of the commanded voltage and rejection of all disturbances; (3) state feedback and a filter to enforce the desired high gain at low frequency and low gain at high frequency and approximately -20-dB/s/dec slope at the crossover frequency in order to attain satisfactory phase margin. A proportional integral (PI) observer, instead of using a hardware current sensor, is used to estimate the inductor current. The controller and filter of a 50-W, DC-DC buck converter that supplies a load with a constant output voltage of 5 V have been designed and implemented in hardware.
File Size	83408
File Format	PDF
ISBN	0818620382
ISSN	00942898
DOI	10.1109/SSST.1990.138138
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-03-11
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robust control DC-DC power converters Switching converters Optimal control Voltage control Frequency conversion Hardware Nonlinear filters Design methodology Tracking loops
Content Type	Text
Resource Type	Article

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