voltage-fed vs. current fed bridge

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Original poster: "Jolyon Vater Cox by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

Dear List,
Having read that voltage fed bridge the output voltage is fixed by the rail 
voltage,
presumably in the case of a current-fed bridge the output current is fixed 
by the rail current.
What is the consequence of this on the rail voltage -can the DC input 
voltage be fixed by di/dt in a current-fed bridge driving an inductive load?