Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charg...Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charge redistribution.This can be solved by methods such as split-phase control,which was developed to address charge redistribution in Dickson SC converters by controlling the charging and discharging of the circuit‟s flying capacitors,such that the equivalent branch voltages line up when the circuit switches states.However,split-phase control is most effective at compensating for charge redistribution when all the circuit‟s flying capacitors are matched in capacitance value.Differences between the capacitance values of the circuit flying capacitors may result in split-phase control not being able to fully compensate for charge redistribution,due to the different charge/discharge rates of the flying capacitors.The work presented in this paper provides an in-depth analysis of the sensitivity of the split-phase Dickson converter to mismatches in flying capacitor values,as well as discussions regarding the design considerations and prototype test results of a split-phase Dickson converter for high-current loads.展开更多
As new technologies emerge data centers and servers have established themselves as one of the largest and fastest growing consumers of power.While switched capacitor converter topologies have some very attractive feat...As new technologies emerge data centers and servers have established themselves as one of the largest and fastest growing consumers of power.While switched capacitor converter topologies have some very attractive features,namely low reliance on magnetic components and high efficiency,several critical factors have prevented their adoption in high current data center applications.The family of converters proposed are novel intermediate bus converter that demonstrates the highest performance yet achieved for 48 V to 12 V conversion with up to 2.5 kW/in^(3) power density,higher than 99% peak efficiency,and 97.2% full load efficiency for 12 V/70 A output.The reduction of voltage stress across the MOSFETs as well as extremely low reliance on magnetics are the key driving factors behind this high efficiency and power density,and are achieved without a sensitive resonant design or the usage of complex control technique.展开更多
文摘Switched-capacitor converters can deliver better performance,power density,and switch utilization compared to inductor-based power converters,but they suffer from current spikes during switching due to capacitor charge redistribution.This can be solved by methods such as split-phase control,which was developed to address charge redistribution in Dickson SC converters by controlling the charging and discharging of the circuit‟s flying capacitors,such that the equivalent branch voltages line up when the circuit switches states.However,split-phase control is most effective at compensating for charge redistribution when all the circuit‟s flying capacitors are matched in capacitance value.Differences between the capacitance values of the circuit flying capacitors may result in split-phase control not being able to fully compensate for charge redistribution,due to the different charge/discharge rates of the flying capacitors.The work presented in this paper provides an in-depth analysis of the sensitivity of the split-phase Dickson converter to mismatches in flying capacitor values,as well as discussions regarding the design considerations and prototype test results of a split-phase Dickson converter for high-current loads.
文摘As new technologies emerge data centers and servers have established themselves as one of the largest and fastest growing consumers of power.While switched capacitor converter topologies have some very attractive features,namely low reliance on magnetic components and high efficiency,several critical factors have prevented their adoption in high current data center applications.The family of converters proposed are novel intermediate bus converter that demonstrates the highest performance yet achieved for 48 V to 12 V conversion with up to 2.5 kW/in^(3) power density,higher than 99% peak efficiency,and 97.2% full load efficiency for 12 V/70 A output.The reduction of voltage stress across the MOSFETs as well as extremely low reliance on magnetics are the key driving factors behind this high efficiency and power density,and are achieved without a sensitive resonant design or the usage of complex control technique.
