NASA SBIR 2016 Solicitation


PROPOSAL NUMBER: 16-2 S4.04-7385
SUBTOPIC TITLE: Extreme Environments Technology
PROPOSAL TITLE: Bidirectional Dual Active Bridge Power Converter for Spacecraft Power Systems

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Mainstream Engineering Corporation
200 Yellow Place
Rockledge, FL 32955 - 5327
(321) 631-3550

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Troy Beechner
200 Yellow Place
Rockledge, FL 32955 - 5327
(321) 631-3550

CORPORATE/BUSINESS OFFICIAL (Name, E-mail, Mail Address, City/State/Zip, Phone)
Michael Rizzo
200 Yellow Place
Rockledge, FL 32955 - 5327
(321) 631-3550

Estimated Technology Readiness Level (TRL) at beginning and end of contract:
Begin: 2
End: 4

Technology Available (TAV) Subtopics
Extreme Environments Technology is a Technology Available (TAV) subtopic that includes NASA Intellectual Property (IP). Do you plan to use the NASA IP under the award?

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
A bidirectional dual active bridge (DAB) dc-dc converter for electrical power systems (EPS) is proposed. The converter operates as a charger, upconverter, and downconverter using a single transformer. The converter uses smart technology to interleave DAB converter stages for ripple current reduction and optimized load sharing of stages to extend the high efficiency load range of the converter to 6.25% of full load. By using smart technology, the load condition of each DAB converter stage is monitored and its load sharing controlled depending on the converters total load condition. In this way, each converter stage is kept at or above 25% load. Therefore the minimum load of the new DAB converter with four interleaved stages is one fourth of 25% or 6.25%. The design employs radiation-resistant and cryogenic-temperature-capable GaN HEMT devices to process 2 kW of power per stage. Mainstream has tested GaN HEMT devices to -225 C. GS66508T GaN HEMT devices are rated for 650 VDC maximum drain-to-source maximum voltage stress allowing for a maximum steady-operating voltage of 400 VDC at 60% derating.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
Many NASA applications can benefit from incorporating the DAB converter into their electrical power systems. Spacecraft power systems can manage power sources with fewer power supplies. To charge on-board batteries and provide the high-voltage DC bus for motor inverters, the power systems of NASA electric vehicles, such as the Modular Robotic Vehicle and unmanned aerial vehicles, such as the Predator B, need compact, low-volume, low-mass dc-dc converters. The converter must also be bidirectional and multifunctional.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
Military vehicle, and helicopter starter-generator power systems also necessitate the use of small, compact, dc-dc converters. These applications also operate in extremely low temperature conditions of less than -55 C in artic, high elevation, and cold, high-altitude, environments. Therefore the DAB converter is an optimal solution for these applications.

TECHNOLOGY TAXONOMY MAPPING (NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.)
Circuits (including ICs; for specific applications, see e.g., Communications, Networking & Signal Transport; Control & Monitoring, Sensors)
Sources (Renewable, Nonrenewable)
Spacecraft Design, Construction, Testing, & Performance (see also Engineering; Testing & Evaluation)

Form Generated on 03-07-17 15:43