A cascaded Schwarz converter for high frequency power distribution

AC distribution networks operating at 20 kHz are being considered for future spacecraft. These systems offer important reductions in size and weight and are easier to protect than DC systems at high power levels. It is suggested that two Schwarz converters in cascade provide a very reliable 20 kHz source that features zero-current commutation, constant frequency, and fault-tolerant operation. Equations for the steady-state performance are derived, and graphical results can be plotted in a convenient manner. A 900 W version has been built and successfully tested under no-load, full-load, and short-circuit conditions.<
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