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Abstract
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This paper proposes a novel single-phase ac–ac Zsource
converter based on the Γ-structure. The proposed converter
uses a coupled transformer to produce the required gain. The obtained
gain can be tuned by varying the turn ratio γΓ of the transformer
within the narrow range of 1 < γΓ < 2. Also, the gain
factor increases with decrease of the transformer turns ratio, γΓ .
Small transformer turn ratio results in more practical topology
in some voltage gains. It makes the transformer design easier and
reduces construction cost. Also, in the proposed topology, the input
and output voltages share the same ground. In order to avoid voltage
and current spikes on the switches, a commutation strategy is
proposed and safe commutation is achieved without using a snubber
circuit. The operating principles and steady-state analyses are
presented to verify the operational concept of the proposed topology.
Also, experimental results are given to verify the validation of
the proposed converter.
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