Abstract
In this paper, a novel topology of switched-capacitor converter is proposed. Compared with the existing switched-capacitor topologies, such as the Dickson-based switched-capacitor converter or the ladder switched-capacitor converter, it limits both voltage stress and current stress of components under lower level, which reduces the volume of capacitor banks and the conduction loss. These characteristics can help high-power density and high-efficiency design, especially in high-voltage-gain applications. The phase shift modulation strategy corresponding to the proposed switched-capacitor converter is also presented in this paper. With phase shift modulation, voltage gain can be adjusted as continuous value. The voltage regulation ability makes up the defect of conventional switched-capacitor converters, and the ZVS operation of all the switching devices is also achieved with the proposed modulation method so that the WBG devices can play more strength in the converter with higher switching frequency. The derivation of the circuit topology and phase shift modulation will be introduced in this paper. The steady analysis and performance comparison will prove the advantage of the proposed converter. A 600-W prototype is built, and the experiment results are presented to validate the proposed converter.
Highlights
Nowadays, high-voltage-gain DC-DC converters [1] are required in many industrial fields, such as solar photovoltaic system, data center, battery formation and so on [2], [3]
This paper proposes a novel topology of switchingcapacitor converter
Uniform distribution of current stress and low voltage stress of switching devices contribute to less conduction loss and high efficiency, which is the advantage of Dickson-based switchedcapacitor converters (SCC), but growing voltage stress of capacitor requires more capacitor volume, especially in high-voltage-gain applications
Summary
High-voltage-gain DC-DC converters [1] are required in many industrial fields, such as solar photovoltaic system, data center, battery formation and so on [2], [3]. The defect of Dickson SCC is that the voltage stress of capacitor rises linearly with the high side voltage, which means larger capacitor banks should be used in high voltage applications Another kind of SCC like Ladder SCC is based on the topology proposed by Cockcroft-Walton. It is suggested that there is an inner contradiction among the voltage stress and current stress of switching device and capacitor in existing SCCs. it is meaningful to combine the advantages of Dickson-based SCC and Ladder SCC to achieve both high efficiency and high power density, especially in high-voltage-gain application. Uniform distribution of current stress and low voltage stress of switching devices contribute to less conduction loss and high efficiency, which is the advantage of Dickson-based SCC, but growing voltage stress of capacitor requires more capacitor volume, especially in high-voltage-gain applications
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