A solid-state distribution transformer

One of the more interesting displays was this solid-state equivalent for a residential distribution transformer. It was built as a thesis project by a N.C. State University Ph.D. candidate. It uses SiC power transistors in its H-bridge inverter which operates at 8 kHz. But it is more than just a one-for-one replacement for the transformer that sits on a pole outside your house; it also includes a DC/DC converter (working at 16 kHz) so it can both charge up an EV and accept direct DC input from a solar array. Of course, there’s more work to be done before this prototype can replace a real distribution transformer. For one thing, the cooling fans visible in image would have to go.