Digital signal control of feedback linearized DC-DC converters.

摘要

The non-linear systems of boost and buck-boost converters are linearized using input-output feedback linearization. The earlier prototype boards, based on Xilinx FPGA for these converters were limited severely in performance and necessitated a new platform. The TI C2000 Delfino(TM) TMS320F28335 digital signal controller implements the digital control methodology.;The new implementation has three separate blocks: power card, controller and the user interface. With a change in the specifications, the controller and the user interface are retained with no hardware changes and the power card is modified. Features like tracking input voltage variations, external AC signal tracking, ripple reduction using current injection technique are included.;For a 12V input, the output voltage can vary from 13V to 40V for the boost and 4V to 26V for the buck-boost converter. Analyses like line regulation, load regulation, minimum input requirements, loop response and effect of switching frequency on the output ripple are exercised.