Title page for ETD etd-10312009-020419
|Type of Document
||Espinosa, Pablo A.
||Design of a high-efficiency, high-performance zero-voltage-switched battery charger-discharger for the NASA EOS space platform
||Master of Science
|Lee, Fred C.
|Cho, Bo H.
|Sable, Don M.
- Earth resources technology satellites
|Date of Defense
The integration of two Zero-Voltage-Switched Bidirectional Battery ChargerDischarger
(ZVS-BBCD) units into a space power system is shown. A robust design
featuring: four interleaved phases, commandable charge rates, overcurrent protection,
overvoltage protection, soft starting, reliable gate drive circuitry, high efficiency, and good
dynamics is demonstrated. The ZVS-BBCD is compared to separate hard-switched multimodule
charge and discharge units in weight and efficiency and is found to be significantly
lighter with comparable losses. The ZVS-BBCD has similar characteristics in discharge
and in charge bus regulation modes and allows the use of a common control design for
both modes. The two ZVS-BBCDs are integrated into the NASA power system testbed
built at the Virginia Power Electronics Center (VPEC) to test their dynamics. The result
shows good characteristics including low bus impedance and fast transient response.
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