Ultrafast sensors for wide bandgap multi-phase power converters

Tell-i’s goal is to move beyond the conventional protection methods that are not designed for wide bandgap (WBG)-based power electronics converter systems. The state-of-art methods result in non-optimized and over-rated systems where the power density is compromised. Through our deep understanding of high-frequency power circuit components and advanced circuit layout design practices, we propose a novel all-passive, isolated, lossless, non-invasive, single current sensing solution for reliable operation and protection of WBG power electronics converters. Each of these characteristics adds significant benefits. An all-passive sensor requires no active processing or saturable circuitry (and their response time is only limited by how fast electrons can move). Therefore, it can be well suited for detecting fast-changing currents seen during fault conditions. A lossless sensor does not compromise the (conversion) efficiency and thermal management of its system. An isolated sensor simplifies the circuitry should be routed to the main controller. A non-invasive sensor does not affect an optimized circuit layout of the converter. Finally, a single-sensor solution is desirable in terms of costs and, more importantly complexity of the system. This SBIR Phase I proposal is to investigate the feasibility of the proposed all-passive single current sensing solution. The proposed sensor is applicable for isolated and non-isolated DC-DC and DC-AC multi-phase systems.

Direct beneficiary of the proposed solution is SmallSat (and even CubeSat) Satellite developers in meeting power management and distribution requirements that have stringent limits on power equipment volume. If the project is successful, it also provides a scalable path for fully integrated and intelligent power electronics modules (i-PEM) using wide bandgap semiconductor devices that finds applications in SEP and fission-based high voltage/power sourced NASA missions.

The desire for volume/mass reduction of controllers is forcing the deployment of WBG devices instead of silicon IGBTs. For these new controllers, Telli offers proper sensing solutions for control, protection, and prognostics. These controllers find applications in power management and actuation for renewable energy systems, electric vehicles, industrial electric motors, and avionic engine control.

This is early/mid-stage (TRL 4) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.

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