슈퍼커패시터와 통합된 태양광 패널에 의해 전력이 공급되는 소물인터넷 프로토타입의 설계 및 평가
Design and Evaluation of the Internet-Of-Small-Things Prototype Powered by a Solar Panel Integrated with a Supercapacitor
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초록
본 논문은 충전식 배터리의 단점을 보완하여 급속 충전과 방전이 가능하고 높은 전력 효율 및 반영구적인 충·방전 사이클 수명의 특성을 갖는 수퍼커패시터를 보조 전력 저장장치로 사용하여 전력관리 시스템에 결합한 프로토타입 플랫폼을 제안한다. 본 논문의 플랫폼을 위해 물리적인 환경 변화에 따른 태양광 패널에서의 공급 전력 차단 혹은 재개 상태를 마이크로컨트롤러에 연결된 인터럽트를 통해 감지할 수 있는 기법을 개발하였다. 연속적인 전원 공급이 보장되지 않는 컴퓨팅 환경에서데이터의 유실을 방지하기 위해 전원 공급이 차단되는 경우 휘발성 메모리에 있는 프로그램 문맥 및데이터를 비휘발성 메모리로 이전하는 낮은 수준의 시스템 소프트웨어를 마이크로컨트롤러에 구현하였다. 실험을 통해 슈퍼커패시터가 보조 전력 저장장치로서 일시적 전원 공급에 효과적으로 하는지를 검증하였으며 다양한 벤치마크를 통해 전원 상태 감지 및 휘발성 메모리에서 비휘발성 메모리로의 프로그램 문맥 및 데이터의 이전 기법이 낮은 오버헤드를 갖음을 확인하였다.
Abstract
In this paper, we propose a prototype platform combined with the power management system using, as an auxiliary power storage device, a supercapacitor that can be fast charged and discharged with high power efficiency as well as semi-permanent charge and discharge cycle life. For the proposed platform, we designed a technique which is capable of detecting the state of power cutoff or resumption of power supplied from the solar panel in accordance with physical environment changes through an interrupt attached to the micro-controller was developed. To prevent data loss in a computing environment in which continuous power supply is not guaranteed, we implemented a low-level system software in the micro-controller to transfer program context and data in volatile memory to nonvolatile memory when power supply is cut off. Experimental results shows that supercapacitors effectively supply temporary power as auxiliary power storage devices. Various benchmarks also confirm that power state detection and transfer of program context and data from volatile memory to nonvolatile memory have low overhead.
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