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학술지 An Energy Efficient Charging Technique for Switched Capacitor Voltage Converters with Low Duty-Ratio
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저자
Saad Arslan, Syed Asmat Ali Shah, 이재진, 김형원
발행일
201806
출처
IEEE Transactions on Circuits and Systems II : Express Briefs, v.65 no.6, pp.779-783
ISSN
1549-7747
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TCSII.2017.2751146
협약과제
17ZB1600, 초저에너지 프로세서를 위한 NZV 마이크로그레인 아키텍처 기술, 이재진
초록
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.
키워드
capacitor charging, DC-DC converter, low-duty ratio, on-chip voltage converter, Step-wise charging, switched capacitor
KSP 제안 키워드
Active period, Capacitor array, Capacitor charging, DC-DC Converters, Duty ratio, Low duty, On-chip, Stored energy, Switched Capacitor(SC), Voltage converter, capacitor voltage