The time-average peak value of low-frequency magnetic noise or low-frequency conduction noise generated from the power supply device that drives the Hall thruster is suppressed without greatly increasing the mass of the satellite. The pulse width control circuit (22) of the Hall thruster power supply (10) outputs a spread signal (58) obtained by spectrum-spreading the pulse signal based on the control signal (54). The voltage output circuit (21) outputs the output voltage (52) to the Hall thruster (50) in accordance with the spread signal (58) output by the pulse width control circuit (22).
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