Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.809t&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Physics
Scientific paper
The structure and optimizing of designing, selecting of parameter was described in this paper, according to the character and desiring of 20cm Xenon ion propulsion system. The Impulse Specific of 20cm XIPS is 3000s,and its thrust is 40mN.The power processing unit (PPU) consists in some modules, they are main hollow cathode heating supply, its igniting one, the contact one, the neutralize heating supply, its igniting one, the contact one, the screen supply, the accelerating supply, and anode supply. Also, the power supply of Xenon storage and feed unit and digital interface and control unit were introduced here. The power supply works with technique of pulse width modulating (PWM) controlled by voltage or current, according to the desiring of the thruster, their stability of output is about 3%. The protecting measure was used as overvoltage, overcurrent and fold back current limiting. For the screen supply, which is higher voltage output, three transformers and three bridges were used to ensure its reliability. The parameter of these modules, showes as following, the igniting supplies outputs1500V/100mA,with protecting of fold back current limiting. The hollow cathode heating supply outputs 0~6V,which is alternate, voltage programmable output and the frequency is 20KHz.The screen is 1000V/0.79A,with stabililizing voltage and protecting of over current output. The anode is 5~7.5A stabililizing current output. The accelerator is -200V/10mA with protecting of over current output. The total power consumptions of PPU are 1100W,and efficient of transfer is more than 80%.
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