Design strategy and efficiency optimization of ultrahigh-frequency (UHF) micro-power rectifiers using diode-connected MOS transistors with very low threshold voltage is presented. The analysis takes into account the conduction angle, leakage current, body effect in deriving output voltage. Appropriate approximations allow analytical expressions for voltage, power consumption, to be derived. A design procedure maximize superposition method proposed optimize performance multiple-output...

This paper presents a system-on-chip passive RFID tag with an embedded temperature sensor for the EPC Gen-2 protocol in 900-MHz UHF frequency band. A dual-path clock generator is proposed to support both applications either very accurate link or low power consumption. On-chip sensing accomplished time-readout scheme reduce Moreover, gain-compensation technique error due process variations by using same bandgap reference of generate bias currents current-to-digital converter and sensor. Also...

An RFID tag features a temperature sensor with gain-error compensation, dual-path clock generator for both accurate link frequency and low power applications, zero-mask CMOS OTP memory array cost. The executes EPC-compliant SENSE-WRITEREAD commands -6 dBm sensitivity +0.4/-1.1°C error one-point calibration.

Most existing simulators for WSNs (wireless sensor networks) model battery-powered sensors and provide MAC routing protocols designed WSNs. Recently, however, increasingly extensive studies of energy harvesting systems require the development appropriate simulators, but there are few related on such simulators. Unlike a new that is integrated with harvesting, rechargeable battery, consuming models. Additionally, must enable applications well-known have convenient user-friendly interface. In...

This paper presents an ultra-high-frequency (UHF) passive sense tag for electrical grid and substation thermal monitoring, with emphasis on the system optimization design of a low power embedded temperature sensor. The designed achieves sensitivity -12.3 dBm under active monitoring operation, which is state art among existing UHF products. sensing inaccuracy ±2.5 °C (3σ) from -25 to 120 after low-cost wireless single-point trim. An antimetal ceramic-packaged was tested by attaching ring main...

A batteryless power management unit (PMU) that manages harvested low-level vibration energy from a piezoelectric device for wireless sensor node is presented. An energy-adaptive maximum point tracking (EA-MPPT) scheme proposed allows the PMU to activate different operation modes according available level. The processed by an ac-dc voltage doubler followed on-chip charge pumps with variable up/down conversion ratios higher efficiency. Interleaving technique employed high-power output reduce...

Wind turbine anomaly or failure detection using machine learning techniques through supervisory control and data acquisition (SCADA) system is drawing wide attention from academic industry While parameter selection important for modelling a wind turbine’s condition, only few papers have been published focusing on this issue in those interconnections among sub-components are used to address problem. However, merely the decision making sometimes too general provide list considering differences...

A number of studies have been actively conducted to address limited energy resources in sensor systems over wireless networks. Most these are based on energy-aware schemes, which take advantage the residual from system's own or neighboring nodes. However, existing estimate solely voltage and current consumption, leading inaccurate estimations because real batteries is affected by temperature load. This misinformation makes a complete nonsense research, not allowed reliable WSN applications....

Exclusive access to the wireless medium, e.g., as provided by bandwidth-reservation mechanisms, limits contention and therefore is capable of providing effective real-time support periodic communications. Furthermore, preserve energy, cards can be powered down between accesses without loss data. However, packet schedulers must aware limited communication opportunities ensure that packets are transmitted before their deadlines, CPU execute jobs such generated these available for transmission...

An energy-harvesting wireless sensor network mitigates the energy shortage problems of existing battery-based sensors; however, its hotspot area nodes still experience 3 blackouts, thereby reducing connectivity. Techniques that transfer directly to using power (WPT) have been studied in recent years address this issue. In paper, we propose a technique uses drone (quadcopter), which is type unmanned aerial vehicle (UAV), as mobile sink. The selects and manages anchor aggregate data...

Energy-harvesting nodes are now being employed in wireless sensor networks to extend the lifetime of network by harvesting energy from surrounding environments. However, unpremeditated consumption can incur problems, such as blackout (due their exceeding over amount harvested energy) or inevitable disposal (in excess battery capacity). In this article, we propose an adaptive data compression and transmission range extension scheme that minimizes increases collected at sink node using...

In wireless sensor networks, a node that increases its sensing rate to gather more data consumes energy. Consequently, it will be exhausted earlier than other nodes. this article, we propose control scheme increase resolution without increasing the number of blackout nodes in energy-harvesting networks. proposed scheme, each selects compression algorithm and adjusts while operates properly. When is estimated have extra energy, gathers additional data. contrast, when exhausted, less save It...

This paper studied the distributed optimal frequency regulation for multiple power generations in an isolated microgrid under limited communication resource. The event-triggered mechanism is introduced construction of algorithm. Each generation only transmits its own information to neighbors through a network when condition satisfied, and burden can be reduced significantly. Moreover, Zeno behavior excluded make algorithm reasonable realistic practical microgrids. proposed method restore...

최근 무선 센서 네트워크(Wireless sensor network, WSN)의 제한된 수명을 근본적으로 해결하기 위하여 에너지 수집형 노드를 사용한 WSN 연구가 진행되고 있다. 하지만, 이러한 연구를 원활히 지원하기 위한 시뮬레이터는 거의 없는 상태이다. WSN을 시뮬레이터들은 기존의 배터리 기반 시뮬레이터의 모델과는 달리, 수집 모델과 소비 모델이 결합된 새로운 모델을 필요로 한다. 아울러 프로토콜 제안 시, 제안된 프로토콜의 성능과 비교할 수 있는 대표적인 라우팅 및 MAC 프로토콜들이 포함되어 있어야 본 논문에서는 다양한 환경 중 가장 널리 사용되는 태양 기반의 노드 네트워크를 지원하는 시뮬레이터를 설계하고 구현하였다. 제안하는 날씨 계절 등의 외부환경과 솔라셀 저장 장치 내부 특성을 고려하여 설계된 모듈이 구현 되어있고, 기법들이 되어 사용자 친화형 GUI를 제공하여 손쉬운 사용이 가능하다. Most existing simulators for wireless...

In wireless sensor networks, increasing the sensing rate of each node to improve data accuracy usually incurs a decrease network lifetime. this study, an energy-adaptive compression scheme is proposed efficiently control in energy-harvesting (WSN). scheme, by utilizing surplus energy effectively for compression, can increase without any rise blackout time. Simulation result verifies that gathers more amount sensory per unit time with lower number nodes than other schemes WSN.

More and more works are using machine learning techniques while adopting supervisory control data acquisition (SCADA) system for wind turbine anomaly or failure detection. While parameter selection is important modelling a turbine’s health condition, only few papers have been published focusing on this issue in those interconnections among sub-components used to address problem. However, merely the decision making sometimes too general provide list considering differences of each...

Most existing simulators for wireless sensor networks (WSNs) model battery-based sensors and provide MAC routing protocols designed WSNs. However, recently, as energy harvesting systems have been studied more extensively, there is an increasing need appropriate simulators, but few related studies employed such simulators. Unlike energy-harvesting WSNs require a new that integrated with the model, rechargeable battery energy-consuming model. Additionally, it should enable applications of...

In the above titled paper (ibid., vol. 54, no. 1, pp. 153-166, Jan 07), there were several errors in equations and a caption. The corrections are presented here.

Conventional design methodologies for EPC RFID tags focused on minimizing the power consumption of each building block to obtain maximum achievable communication distance. In this work, we analyze different operation states tag and their corresponding characteristics identify limiting factor that dictates Based analysis, propose two approaches extend distance: (1) shaping load track unbalanced input tag; (2) scheduling average out large burst consumption. Simulation results show sensitivity...