The new transformer-free topology with small and lightweight filter inductors, high performance IGBTs in both inverter and rectifier, and advanced control strategies can bring improved performance and value. Compared to legacy UPS topology designs, a transformer-free UPS is typically only 25 percent of the weight and occupies 60 percent of the footprint. Low input THD (0.99) are supported down to nearly 10 percent load without the need for an additional input filter. In addition, full load efficiency can reach 94 percent and above. The packaging can be designed so that cooling and wiring do not requireside or rear access or clearance. With these new benefits, this technology-intensive design will become the preferred topology.
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