A Resonant Cockcroft-Walton Switched-Capacitor Converter Achieving Full ZCS and >10kW/inch3 Power Density
| Autor: | Rajeevan Amirtharajah, Nathan Ellis |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry 05 social sciences 020207 software engineering 02 engineering and technology Switched capacitor Inductor law.invention Capacitor law 0202 electrical engineering electronic engineering information engineering Optoelectronics 0501 psychology and cognitive sciences Current sensor business Electrical impedance 050107 human factors Power density Voltage Electronic circuit |
| Zdroj: | 2019 IEEE Energy Conversion Congress and Exposition (ECCE). |
| DOI: | 10.1109/ecce.2019.8913013 |
| Popis: | Hybrid LC switched-capacitor converter architectures have demonstrated high power density while retaining efficiency at high conversion ratios. This work presents a resonant Cockcroft-Walton (CW) converter that achieves full zero-current switching (ZCS) on all switches using a single inductor and requiring only one current sensor. To do so, an N-phase clocking scheme is employed, eliminating the parallel paths that typically introduce transient shorting losses in a conventional 2-phase CW converter. The reduced voltage stress on the CW’s fly capacitors results in a dramatic reduction in volume when using common MLCC capacitors. A discrete 1:5 CW prototype using silicon FETs and a spiral trace inductor was assembled on two commonly available PCB processes: 0.8 mm FR4 with 2 oz. Cu, and 0.127 mm polyimide film with 0.75 oz. Cu. The latter achieved a peak efficiency of 95% and a maximum power density of 0.686 W/mm3 (11.2 kW/inch3) in a volume of 44.5 mm3 (0.00271 inch3), excluding level-shifting and clock generation circuits. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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