Dual Output Bidirectional DC-DC Isolated SiC-based Power Converter

This project is on designing and implementing a bidirectional triple active bridge (TAB) power converter module, built using wide bandgap power device components for high efficiency and modularity. During Phase II, we advance the development of a modular triple active bridge (TAB) DC-DC power conversion interface as part of DC distribution systems or local DC microgrids. Of particular interest is the development of a versatile power module for use in lunar and planetary surface power management and distribution systems. The input to the converter is from a solar panel output, or from a fixed DC link, or from a local energy storage (i.e., battery), while the high-voltage output is taken as connected to a DC distribution bus supplying DC load, and the low-voltage output is considered as connected to a battery. Referring to NASAs recent trends on power management and DC distribution bus voltage levels, we assume that the converter has a nominal input DC bus voltage of 160V, while the two output ports of the converter are rated for nominal voltage levels of 120V and 28V, and power levels of 6kW and 3kW, respectively. With the aid of an efficient design and a high-frequency circuit board-wound planar transformer, we target a low weight (1.5kg) and thermally efficient compact design (1.1 L), yielding to high gravimetric and specific power densities. The newly developed control and modulation techniques are used to improve overall power conversion efficiency, especially in the case of light load, by more than 5% compared to conventional TAB converters. The main targets for Phase IIE research to build on Phase II results are as follows: 1-Develop robust CAN communication needed for tandem operation of paralleled power modules. 2-Increase the input port voltage rating from 160V to 200V. 4-Experiment with various power sharing algorithms to determine their effect on the overall efficiency.

The planned space stations such as Gateway, and the future lunar and planetary surface missions for establishing bases, for example, on the Moon and eventually on Mars, require low mass and high efficiency modular power electronic regulators. The plug-and-play power module units with autonomous smart control schemes similar to those that we build are pivotal to manage and distribute power across a grid such as that needed, for example, at a future lunar base. Such a base requires high power levels and long distribution networks.   Applications of harsh environment SiC power electronics include (a) power management and distribution systems in military and commercial vehicles, (b) automotive engine control electronics, (c) electrical actuators and motor drives for aircraft jet engines, (d) compressors in geothermal, oil and gas extraction, (e) deep-well drilling telemetry modules and gas turbine electric actuation systems.  

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