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An Energy Efficient Charging Technique for Switched Capacitor Voltage Converters With Low-Duty Ratio
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- Authors
- Saad Arslan, Syed Asmat Ali Shah, Jae-Jin Lee, HyungWon Kim
- Issue Date
- 2018-06
- Citation
- IEEE Transactions on Circuits and Systems II : Express Briefs, v.65, no.6, pp.779-783
- ISSN
- 1549-7747
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- Charging a capacitor array of a switched-capacitor (SC) dc-dc converter, supplying load circuits with a very short active period, can be pivotal to achieve high energy efficiency of its operation. This is because the capacitors may lose most of the stored energy during a long sleep period, and thus every sleep-to-active transition requires full recharging of the capacitors. In this brief, we present an energy efficient capacitor charging technique called split-capacitor charging, which charges a capacitor array in a step-wise fashion. Circuit simulations demonstrate that the proposed technique can reduce the energy wastage during sleep-to-active transition up to 66%. When tested on load circuits with a short active period, a voltage converter employing the proposed charging method shows up to 24% improvement in energy efficiency over conventional SC converters.
- KSP Keywords
- Active period, Capacitor array, Capacitor charging, DC-DC Converters, Duty ratio, High energy efficiency, Stored energy, Switched Capacitor(SC), Voltage converter, capacitor voltage, charging method