A High-Efficiency Resonant Switched Capacitor Converter With Continuous Conversion Ratio

A resonant switched capacitor converter with high efficiency over a wide and continuous conversion ratio range is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over cl...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-03, Vol.30 (3), p.1373-1382
Main Authors: Cervera, Alon, Evzelman, Michael, Peretz, Mor Mordechai, Ben-Yaakov, Shmuel
Format: Article
Language:English
Subjects:
Capacitors
Charge
Conversion ratio
Converters
Discharges (electric)
Electric currents
Electric potential
Electric power
Electrical equipment
Energy efficiency
Exact solutions
Gyrators
Load flow
Network topologies
Switches
Topology
Voltage
Voltage control
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Summary:A resonant switched capacitor converter with high efficiency over a wide and continuous conversion ratio range is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over classical switched capacitor converters, for which the efficiency is strongly related to the conversion ratio. The operation principle applies three zero current switching states to charge, discharge, and balance the remaining charge of the flying capacitor. This results in a gyrator, i.e., a voltage-dependent current source, with a wide range of voltage conversion ratios (smaller as well as greater than unity) as well as bidirectional power flow capabilities. The analytical expressions for the conversion ratio and expected efficiency are provided and validated through simulations and experiments. The experimental verifications of the converter demonstrate peak efficiency of 96% and above 90% efficiency over a wide range of voltage gains and loading conditions. In addition, the system was found to be highly efficient at the extreme cases of both light and heavy loads.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2317758