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1. A TWO-MODE CONTROL SCHEME WITH INPUT
VOLTAGE FEED-FORWARD FOR THE TWO-SWITCH
BUCK-BOOST DC–DC CONVERTER
ABSTRACT:
The two-switch buck-boost (TSBB) converter is suitable for wide input
voltage applications. In order to achieve high efficiency over the entire input
voltage range, the TSBB converter is operated in buck mode at high input voltage
and boost mode at low input voltage. Such operation is called the two-mode
control scheme. The objective of this paper is to propose an input voltage feed-forward
(IVFF) method to reduce the influence of the input voltage disturbance on
the output voltage. The small-signal models of the TSBB converter are built, and
based on which, the IVFF functions under different operating modes of the TSBB
converter are derived. The IVFF function in boost mode is simplified for easy
implementation. The two-mode control scheme with IVFF compensation is then
proposed for the TSBB converter, which realizes automatic selections of operating
modes and the corresponding IVFF functions. Besides, nearly smooth switching
between buck and boost modes is also guaranteed. For exhibiting the advantages of
the proposed control scheme clearly, comparisons between the two-mode control
with and without IVFF compensation have been presented in this paper, including

2. the output signal of the voltage regulator and input -to-output voltage transfer
function.
BLOCK DIAGRAM
Dc source Two switch buck
CONTROLLER CIRCUIT:
 PIC controller
OUTPUT:
 Hardware
boost
Output
Driver unit
Controller

3.  Simulation
TOOLS:
 MP Lab
 Orcad/Pspice
 Matlab/simulation