Stabilizing low-frequency oscillation with two-stage filter in Hall thrusters
The use of a filter is the most common method to suppress low-frequency discharge current oscillation in Hall thrusters. The only form of filter in actual use involves RLC networks, which serve the purpose of reducing the level of conducted electromagnetic interference returning to the power process...
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Veröffentlicht in: | Review of scientific instruments 2017-07, Vol.88 (7), p.073502-073502 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The use of a filter is the most common method to suppress low-frequency discharge current
oscillation in Hall thrusters. The only form of filter in actual use involves RLC
networks, which serve the purpose of reducing the level of conducted electromagnetic
interference returning to the power processing unit, which is the function of a filter.
Recently, the role of the filter in the oscillation control was introduced. It has been
noted that the filter regulates the voltage across itself according to the variation of
discharge current so as to decrease its fluctuation in the discharge circuit, which is the
function of a controller. Therefore, a kind of two-stage filter is proposed to fulfill
these two purposes, filtering and controlling, and the detailed design methods are
discussed and verified. A current oscillation attenuation ratio of 10 was achieved by
different capacitance and inductance combinations of the filter stage, and the standard
deviation of low-frequency oscillations decreased from 3 A–1 A by the control stage in our
experiment. |
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ISSN: | 0034-6748 1089-7623 |
DOI: | 10.1063/1.4990045 |