JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleSimulation of plasma resistance generated by solar array panel surface discharge
Author(jpn)前島 淳司; 奥村 哲平; 増井 博一; Cho, Mengu
Author(eng)Maeshima, Junji; Okumura, Teppei; Masui, Hirokazu; Cho, Mengu
Author Affiliation(jpn)九州工業大学; 九州工業大学; 九州工業大学; 九州工業大学
Author Affiliation(eng)Kyushu Institute of Technology; Kyushu Institute of Technology; Kyushu Institute of Technology; Kyushu Institute of Technology
Issue Date2008-05
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第27回宇宙エネルギーシンポジウム 平成19年度
The Twenty-seventh Space Energy Symposium
Start page44
End page48
Publication date2008-05
AbstractIn recent years, long-term employment and enlargement are becoming remarkable in space development. The increase in electric power may include discharges on the solar array panels of spacecrafts. Furthermore, the discharges involve the risk of producing surges which affect payloads in the spacecrafts. Testing with real satellites has many problems with time, effort, equipment, cost, etc., so an accurate evaluation by simulation is needed. In order to evaluate correctly, we have to imitate discharge currents that flow through a circuit. This discharge current can be obtained by modeling the plasma resistance generated by the discharges, as well as the equivalent circuit of the whole spacecraft. In this research, we modeled this plasma resistance. First, plasma resistance includes two resistance components, one of which exists in the discharging current path of the charges stored in the space body. The other resistance component exists in the inflowing current path of the charges stored on the surfaces of the solar cells. The former current and resistance are known as a blow-off current and blow-off resistance. The latter current and resistance are known as a flash-over current and flash-over resistance. In order to acquire experimental values of blow-off resistance, we measured the blow-off current using a solar cell, and analyzed it using SPICE simulation. From the results, it was confirmed that blow-off resistance decreased exponentially. Also, blow-off resistance had a relationship with discharge energy. In addition, we measured the flash-over resistance. We measured the flash-over current using a solar array coupon which had 50 cells on the coupon, and analyzed it using SPICE simulation. From the results, it was confirmed that flash-over resistance increased linearly in proportion to the distance from the discharge point. In the near future, we will create the equivalent circuit of the solar array panel. Moreover, there is a need to create the equivalent circuits of recently prevailing GaAs solar cells and triple-junction solar cells.
Keywordssolar array; surface discharge; short circuit; discharge current; plasma resistance; computerized simulation; spacecraft power supply; aerospace environment; onboard equipment; 太陽電池アレイ; 表面放電; 短絡; 放電電流; プラズマ抵抗; 計算機シミュレーション; 宇宙機給電; 航空宇宙環境; 搭載機器
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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