A unity power factor resonant AC/DC converter for high frequency space power distribution system

This paper presents analysis and design of a resonant AC/DC converter topology, suitable for use in an advanced single-phase, sine-wave voltage, high-frequency power distribution system, of the type that was proposed for a 20 kHz Space Station Primary Electrical Power Distribution System. The converter comprises a transformer, a double tuned resonant network comprising of series tuned and parallel tuned branches, a controlled rectifier and an output filter. A symmetrical phase control technique which generates fundamental AC current in phase with the input voltage is employed. Steady-state analysis of the converter in continuous current mode of operation is provided and the performance characteristics presented. The proposed converter has close-to-unity rated power factor (greater than 0.98), a wide range of output voltage control (0 to 100%), low total harmonic distortion in input current (less than 8%), and high conversion efficiency (greater than 92%). Finally, selected experimental results of a bread-board converter are presented