Abstract: A switched-capacitor (SC) network in an SC converter is controlled to operate at varying resonant modes to achieve high conversion ratio efficiency, at a low circuit component count. These power converters are suited to numerous application areas including improving energy efficiency of data centers. A family of resonant switched capacitor (SC) converters with multiple operating phases are presented “Multi-Resonant SC Converters”. Described in detail are an 8-to-1 Multi-Resonant-Doubler (MRD) converter and a 6-to-1 Cascaded Series-Parallel (CaSP). The topology of these converters make them amenable to combining like units in parallel toward reaching higher power levels.

Abstract: A multi-phase hybrid power converter architecture which provides high efficiency, high power density and high conversion ratios for non-isolated DC to DC power conversion. Hybrid converters are described in which a switched-capacitor network is interoperably merged with a switched-inductor network having multiple inductors, resulting in a circuit with reduced component count and in which soft-charging of the capacitors is performed. Multi-phase switching is utilized and includes a freewheeling state for output voltage regulation in which inductor current ramps down. The SC converter can be configured to provide various conversion ratios, such as 4-to-1, 6-to-1 and 8-to-1, and optimized for the needs of specific application.

Abstract: A switched-capacitor (SC) network in an SC converter is controlled to operate at varying resonant modes to achieve high conversion ratio efficiency, at a low circuit component count. These power converters are suited to numerous application areas including improving energy efficiency of data centers. A family of resonant switched capacitor (SC) converters with multiple operating phases are presented “Multi-Resonant SC Converters”. Described in detail are an 8-to-1 Multi-Resonant-Doubler (MRD) converter and a 6-to-1 Cascaded Series-Parallel (CaSP). The topology of these converters make them amenable to combining like units in parallel toward reaching higher power levels.

Abstract: A cascaded converter architecture comprising a pure switched-capacitor (SC) stage and a resonant SC stage. Multiple switching buses are utilized to connect the first-stage SC converter with second-stage multi-phase resonant SC converters. The flying capacitors of both stages are resonant with the output inductors, so the charge distribution loss is eliminated. Zero-current switching is realized by adjusting the duty ratio and switching frequency. By using the intermediate switching bus, the number of switches can be reduced, and the intermediate bus capacitor is not required; thereby greatly reducing component count and cost while improving power density. Numerous implementation variations are described by way of example and not limitation.

Abstract: A cascaded power converter architecture is provided which merges a front end stage with subsequent interleaved Switched Capacitor (SC) stages to achieve high conversion ratios. This interleaving control technique addresses practical conversion challenges. Numerous topologies can be created from this approach, a number of examples being depicted, including: (a) a two stage 4-to-1 conversion using two 2-to-1 ReSc converter stages, and (b) 8-to-1 converters with (b)(i) a 2-to-1 ReSC stage followed by a 2nd stage having four 4-to-1 STC converter phases, (b)(ii) a 2-to-1 ReSC 1st stage followed by a 2nd stage with four 4-to-1 series-parallel phases, and (c) a multi-stage cascading three stage converter with a 2-to-1 ReSC 1st stage, a 2nd stage of two 2-to-1 ReSC phases, and a 3rd stage having four 2-to-1 ReSC phases.