Patent ID: 8643347
Filing Date: 2014-02-04
Classification: H02M,Y02B

Abstract:
1. A converter circuit comprising: a switched capacitor transformation stage having a transformation stage input port and a transformation stage output port, said switched capacitor transformation stage comprising one or more switches and one or more capacitors and said switched capacitor transformation stage configured to accept an input voltage V an auxiliary converter stage having an input coupled to said switched capacitor transformation stage, said auxiliary converter stage comprising one or more switches and one or more magnetic energy storage components configured to recover energy normally dissipated in capacitors of said switched capacitor transformation stage via said one or more magnetic energy storage components; wherein in response to the one or more switches of said switched capacitor transformation stage being configured so that a capacitor in said switched capacitor transformation stage is charging or discharging, said switched capacitor transformation stage operates such that a portion of the difference between the input voltage V wherein the portion of the difference between the input voltage VIN and the capacitor stack voltage V wherein said one or more switches in said auxiliary converter stage operate at a switching frequency which is higher than the switching frequency of the one or more switches in said switched capacitor transformation stage.