Low-loss single-switch three-phase AC-DC converter feeding inductive load

A three-phase AC/DC converter based on isolated Cuk topology feeding an inductive load is presented. A high power factor is achieved, at constant duty-cycle and switching frequency, by discontinuous input current mode operation. An auxiliary circuit allows zero voltage turn-off while limiting the over-voltage on the switch. PWM control is used to reduce sensitivity to line disturbances and to eliminate the 300 Hz ripple on the output current. Experimental measurements taken on a 400 W prototype confirm theoretical forecasts.<
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