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ZSI (shown in Fig. 1), and SBI (shown inFig. 2). The advantages and disadvantages of these convertersare discussed in the followingThe conversion ratio (Vc/Vg) of the CFSI is the same as thatof the ZSI, which is 1/(1-2D). Compared to CFSI, both boost-VSI topology and SBI offer a lower voltage conversion ratio.In a practical scenario, considering maximum boost convertergain to be 5 and loss-less inversion, the overall rms ac to inputdc conversion ratio (GAC) for a boost-VSI topology is about3.53 (which is 5 × 0.707). SBI offers a GAC of 2 [13]. Theexperimentally obtained overall conversion ratio for CFSI is 3.6(127 V rms ac from a 35.3-V dc input). It is to be noted herethat, in the case of the two-stage boost-VSI topology, there isno restriction on the modulation index of the VSI. However, inCFSI, the shoot-through duty ratio puts some restriction on themodulation index as given by (15). This is similar to the case inZSI and SBI.
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