Design of an All-SiC Parallel DC/DC Weinberg Converter Unit Using RF Control

We demonstrate the feasibility of RF communication-based wireless load-sharing control of a spatially distributed two-module parallel dc/dc (Weinberg) converter unit (DDCU), each operating at a high switching frequency (0.25 MHz) and delivering an output power of 500 W. From control standpoint, we demonstrate the feasibility of wireless control scheme using a digital signal processing-field-programmable gate array (DSP-FPGA based) control-communication interface. Further, using a composite Lyapunov function methodology, we determine (in the presence of delay owing to channel disruption) the reachability of the DDCU under startup condition, and also investigate the effect of delay on orbital stability and performance. With regard to the hard-switched DDCU, we outline some practical design aspects of the high-frequency all-SiC Weinberg converter power stage and subsequently demonstrate experimentally that the DDCU achieves high efficiency in spite of operating at high frequency and high temperature, and exhibits satisfactory steady-state and transient performances despite channel separation of up to 30 ft.