NASA SBIR 2017 Solicitation


PROPOSAL NUMBER: 171 S3.03-9426
SUBTOPIC TITLE: Power Electronics and Management, and Energy Storage
PROPOSAL TITLE: A Universal High Efficiency Modular Discharge Over a Wide Input/Output Voltage Range for Hall Thruster Power Processing Unit

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Busek Company, Inc.
11 Tech Circle
Natick, MA 01760 - 1023
(508) 655-5565

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Dr. Xiaohu Liu
11 Tech Circle
Natick, MA 01760 - 1023
(508) 655-5565

CORPORATE/BUSINESS OFFICIAL (Name, E-mail, Mail Address, City/State/Zip, Phone)
Judy Budny
11 Tech Circle
Natick, MA 01760 - 1023
(508) 655-5565

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

Technology Available (TAV) Subtopics
Power Electronics and Management, and Energy Storage 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)
Busek proposes a novel, universal, modular, 2.5kW discharge converter for Hall Effect thruster (HET) Power Processing Unit (PPU). The unique advantages of the proposed system include:(1) a wide input voltage range (28V to 100V) with a wide output voltage (150V to 400V) while maintaining high efficiency operation. Therefore, it provides a universal solution for aerospace systems with different bus voltages. (2) this modular converter will be capable of input-parallel output-series (IPOS) operation to support higher output voltage (800V-1200V or higher) and input-parallel output-parallel (IPOP) operation to support higher output power (20kW or higher). An intelligent "plug-n-play" power sharing and voltage balancing control is proposed to support the IPOS and IPOP operations. (3) the proposed converter adopts a soft-switching DC/DC topology using the advanced GaN power MOSFETs to enable high efficiency with high switching frequency operation, which leads to significant size reduction of magnetics and other passive components to push for high power density design. The targeting power density for single module is more than 1kW/kg.
The Phase I effort includes design and analysis of modular discharge converter with the GaN power MOSFETs and the "plug-n-play" power sharing and voltage balancing control system to support IPOS and IPOP operation. The bread board will use COTS EEE parts. Its testing will validate the performance over the wide input/output voltage range. Two modules will verify IPOS and IPOP operation. The initial system integration test with Busek HET will also be conducted.
In Phase II we will fully characterize the breadboard discharge converter with a thruster and develop a proto-flight brass-board level unit with multiple discharger modules using GaN devices. At the conclusion of Phase II we will build and deliver several discharger modules to NASA for additional characterization testing.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
HET systems are well suited for interplanetary transfers, supporting exploration and science missions. Throttling ability is important for a thruster that might be called upon to propel a spacecraft from Earth to Mars, which orbits at 1.52 AU and reduces the solar constant to 43% of the value at Earth. The Outer Planet Assessment Group has called out high power density/high efficiency power electronics as needs for the Titan/Enceladus Flagship and planetary exploration missions. These types of missions, including Mars Sample Return using Hall thrusters and PPUs, require advancements in power electronics to improve efficiency, reduce mass and volume, and to develop systems beyond the state-of-the-art.
A HET system that provides efficient and affordable transportation to, from and around space destinations is one of NASA Grand Challenges. NASA has identified 30kW-class SEP systems as a high-value intermediate step toward higher power systems due to broad cross-cutting capability. The proposed modular discharger is easily scalable, providing NASA with greater mission flexibility over any target SEP power level.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
Electric propulsion systems have been identified as a key technology for transportation of DoD space assets. The AFRL IHPRPT Program continues to invest in the development of HET systems. Hall Effect thruster propulsion systems can serve DoD space needs by the in-space transportation of DoD space assets and commercial communication satellites for both orbit transfer and station keeping. The PPU for such a thruster system could enhance many missions for satellite orbit maintenance, orbit changes, and repositioning. The PPU is also compatible with Hall thruster operating on alternate propellants such as krypton and/or iodine. High power density EP systems are also identified in the IHPRPT RP21 goals for spacecraft propulsion.
For commercial applications dominated by communications GEOsats, the proposed universal, rugged converter could significantly reduce the cost of current PPU. Because of its wide input voltage range and IPOS and IPOP operation such converter could capture significant fraction of the commercial market further reducing cost and delivery time.
A high power density modular PPU could also find near term application on an all-electric upper stage derived from Busek/ULA ESPA orbit maneuvering system (OMS), a free flying S/C based on the ESPA ring. The low power ESPA system presently utilizes four BHT-1500 Xe Hall effect thrusters and is capable of delivering up to five secondary payloads to diverse earth orbits.

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)
Command & Control
Materials (Insulator, Semiconductor, Substrate)
Models & Simulations (see also Testing & Evaluation)

Form Generated on 04-19-17 12:59