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Advances in power electronics and high-performance electrical technology are driving a move toward switch-mode circuits for AC-DC conversion. The efficient control of these circuits is an ongoing research challenge, and to date has focussed on the more popular voltage-driven converter. This paper presents a model applicable to the study and control of generic three-phase switch-mode converters (voltage and current-driven), under the widest possible range of switching scenarios. The model permits a generalization of the "space vector" framework, and makes possible a three-tiered approach to control in which AC-side, DC-side and low-level switching control tasks are decoupled from one another.