project center in trichy
Generally, single-stage buck-boost inverters consist of distinct
circuits operating individually in buck/boost or positive/ negative modes, the
latter definitely leading to crossover distortion in the output current. This
paper proposes a switching strategy that changes the bi-modal operation of a
single stage buck-boost topology to a single mode inverter (SMI). This is due
to the consequent voltage gain which ensures that the output voltage polarity,
apart from its magnitude, is an exclusive function of the duty ratio.
Operational principle and salient hardware design are explained with the help
of equivalent circuits. Details about the dynamic model are presented, based on
which controller design is carried out for both stand-alone and grid-connected
operation. Experimental results obtained from a 300 W, 110 V laboratory
prototype are presented to validate the performance of the proposed switching
strategy.
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