Design and Test Hardware for a Solar Array Switching Unit

Paper #:
  • 929082

Published:
  • 1992-08-03
Citation:
Patil, A., Cho, B., Sable, D., and Lee, F., "Design and Test Hardware for a Solar Array Switching Unit," SAE Technical Paper 929082, 1992, https://doi.org/10.4271/929082.
Pages:
6
Abstract:
This paper describes the control of a pulse width modulated (PWM) type sequential shunt switching unit (SSU) for spacecraft applications. It is found that the solar cell output capacitance has a significant impact on SSU design. Shorting of this cell capacitance by the PWM switch causes input current surges. These surges are minimized by the use of a series filter inductor. The system with a filter is analyzed for ripple and the control to output-voltage transfer function. Stable closed loop design considerations are discussed. The results are supported by modeling and measurements of loop gain and of closed-loop bus impedance on test hardware for NASA's 120 V Earth Observation System (EOS). The analysis and modeling are also applicable to NASA's 160 V Space Station power system.
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