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Efficient design in a dc to dc converter unit
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Williams, Fitch R. Schmitz, Gregory V. Bruemmer, Joel E. |
| Copyright Year | 2002 |
| Description | Space Flight hardware requires high power conversion efficiencies due to limited power availability and weight penalties of cooling systems. The International Space Station (ISS) Electric Power System (EPS) DC-DC Converter Unit (DDCU) power converter is no exception. This paper explores the design methods and tradeoffs that were utilized to accomplish high efficiency in the DDCU. An isolating DC to DC converter was selected for the ISS power system because of requirements for separate primary and secondary grounds and for a well-regulated secondary output voltage derived from a widely varying input voltage. A flyback-current-fed push-pull topology or improved Weinberg circuit was chosen for this converter because of its potential for high efficiency and reliability. To enhance efficiency, a non-dissipative snubber circuit for the very-low-Rds-on Field Effect Transistors (FETs) was utilized, redistributing the energy that could be wasted during the switching cycle of the power FETs. A unique, low-impedance connection system was utilized to improve contact resistance over a bolted connection. For improved consistency in performance and to lower internal wiring inductance and losses a planar bus system is employed. All of these choices contributed to the design of a 6.25 KW regulated dc to dc converter that is 95 percent efficient. The methodology used in the design of this DC to DC Converter Unit may be directly applicable to other systems that require a conservative approach to efficient power conversion and distribution. |
| File Size | 429026 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020083039 |
| Archival Resource Key | ark:/13960/t1dk0cs7w |
| Language | English |
| Publisher Date | 2002-08-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Wiring Electric Potential International Space Station Circuits Field Effect Transistors Space Station Power Supplies Electric Power Structural Reliability Cooling Systems Mechanical Engineering Voltage Converters Dc To Dc Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
