(1) The parallel resonant inverter topology has only the advantage of natural output short circuit proof over either series-parallel or hybrid inverter topology. Therefore, this inverter is useful only for those applications which have severe short circuit requirements. (2) The hybrid resonant inverter topology has load independent output voltage, and excellent efficiency from full-load to reduced-load. However, this inverter has a higher number of parts than either the parallel or series-parallel topology. Therefore, the hybrid resonant inverter is best suited for pulse-power applications. (3) The series-parallel inverter has all the features of hybrid resonant topology and a reduced number of components. However, this inverter has higher losses than the hybrid inverter at reduced load (output load less than half the rated load). Therefore, the series-parallel inverter is best suited for those applications where the ratio of peak power/average power demand is not large (not greater than 4:1). DC/DC Converters The behaviour of constant frequency pulse width modulated resonant mode DC/DC converters has been described. The analyses of series, parallel and series-parallel resonant converters have been presented. Both series- and series-parallel resonant topologies offer advantages over the parallel-resonant topology. The series converter has better full-load to no-load efficiency and lower total rating of the reactive components than the series-parallel converter. The pulse width modulated control technique permits the operation of the series converter at no-load. A limitation of the series converter is that the output DC filter capacitor carries high ripple currents. Therefore, the series resonant converter has advantages for all applications except low voltage high current outputs. For low voltage and high current outputs, the seriesparallel converter is preferred. AC/DC Converter Two new converter configurations have been described for AC/DC power conversion in high power high frequency power distribution systems. These converters convert high frequency AC voltage to a controlled output DC voltage by using a single conversion stage and draws close to sinusoidal input current with a near unity power factor. This results in the highest conversion efficiency and the lowest mass. The Type-1 converter is suitable for a lower range of high power applications (up to approximately 1 kW). However, the Type-2 converter is best suited for higher power ratings. ACKNOWLEDGEMENTS The work leading to this paper was performed for SPAR Aerospace, the prime contractor for the NRCC, Canadian Space Station program by Canadian Astronautics Limited (CAL), Ottawa, Ontario. The authors would also like to express their sincere thanks to CAL, in particular Mr Harold Raine, for the invaluable assistance and suggestions in preparing this paper.
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