상세정보
학술지
An Energy Efficient Charging Technique for Switched Capacitor Voltage Converters with Low Duty-Ratio
- 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
- 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.
- KSP 제안 키워드
- Active period, Capacitor array, Capacitor charging, DC-DC Converters, Low duty, Stored energy, Switched Capacitor(SC), Voltage converter, capacitor voltage, charging method, circuit simulation