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All commercial fishery species harvested globally either live on or near the seabed (also referred to as the benthos or benthic environment) or employ life history strategies or behaviors linked to benthic processes. The act of pursuing and catching benthic and demersal species requires operating fishing gear on or very near the seabed, resulting in direct gear-seabed contact. It is essential to further...
This paper presents a real-time, low-cost, wireless, AC and DC monitoring system based on an ATmega328P-PU microcontroller. The proposed system is composed by different client nodes, which have the task to measure the main electrical quantities involved in the system, and a server node that collects the data and send them to a display device. The system is well suited for a good accuracy monitoring...
This paper presents a novel MEMS-based integrated current and voltage sensor for the measurement of voltage and current in power distribution networks. It adopts three-dimensional (3D) induction coil as current sensor and two asymmetric sensing electrodes as voltage sensor to detect voltage and current simultaneously. A micromachining fabrication process is proposed to fabricate the integrated current...
We demonstrate a low-power CMOS ISFET array for pH sensing which is inductively powered using NFC. Each pixel in a 3-by-3 array contains an ISFET operating in weak-inversion which detects changes in pH as a current. The output of all pixels is then averaged and converted to a frequency using a current-starved ring oscillator. We make use of a commercial NFC IC, the SIC4310, to harvest power from a...
This paper describes a method to provide LV four-wire three-phase power converters with the capability of correcting unbalance as an ancillary service to the main role that they play in the distribution system (distributed generator, energy storage system, drive, etc). Typically, dedicated grid/load current sensors are needed to effectively comply with unbalance compensation tasks, increasing system...
Due to the advantages of cost, volume and efficiency, transformerless grid-connected power converters have drawn an increasing attention, especially in low-power PV applications. However, the lack of isolation between inverter and grid brings in some potential risks to the distribution network. Among them, the dc injection flows into the grid remains a significant concern. Owing to the offset and...
With the introduction of high frequency semiconductor devices and converters, wideband, lossless and accurate current measurement is the key to achieving highly efficient power conversion. Magnetoresistors (MR) provide an alternative solution to isolated and contactless current monitoring in power converters. However, there is few literature on their application for power electronics converters. In...
This paper presents a sinusoidal ripple current (SRC) emulator which superimposes an ac ripple current frequency into a dc charging current in order to produce a sinusoidal ripple current without a ripple current controller. It can be used for several purposes: 1) to analyze the impact of ac ripple current magnitude and frequency on the battery internal characteristics; 2) to determine the parameters...
In order to evaluate the insulation condition of gas insulated switchgear (GIS) by using the ultra-high frequency (UHF) method, attempt to estimate PD current using the finite difference time domain (FDTD) method was carried out. The influence of PD current parameters and the position of measuring point on the received electromagnetic (EM) waves was studied. The EM waves received by using UHF sensors...
The increase in the use of mobile devices from the first decade of this century has enabled users to perform several activities previously only possible through personal computers. However, the use of these devices is impacted by their known computational limitations, such as data processing, RAM memory, storage, and energy autonomy limitations. Considering this context, to measure the impact of the...
This paper proposes a new effective algorithmic basis for solving the problem of choosing the permissible deviations of the parameters of the elements, choosing the measured currents and diagnostics of the electrical device elements. The algorithms developed by the authors are based on the new modification of the Gaussian elimination method to solve the systems of linear algebraic equations. One of...
This work presents preliminary observations of the first lightning flash striking an instrumented lightning rod on the top of a common building in Brazil. The measurements include direct electric current in the lightning rod, high-speed recordings using different types of cameras and data from two lightning location systems (LLS) that operate in Brazil: RINDAT and BrasilDAT. The striking flash contained...
This paper discusses about noise measurement in the high voltage laboratory by using high frequency current transformer (HFCT) and loop antenna. This paper explains how to measure the noise characteristics by using two sensors: HFCT and loop antenna. The measurement of noise characteristics was based on the measurement of background noise when the power source of the experiment system is off. The...
This paper presents a new CMOS stress sensor readout method based on the ratiometric measurement principle. A unique feature of this method is to simultaneously detect the in-plane stress magnitude and angle. The sensor core is a cascoded current mirror structure consisting of a reference input branch and four output branches with MOSFETs in 0°, 45°, 90° and 135° layout orientations. Current ratios...
In this paper, we present a simple differential CMOS ISFET based pH sensor. The design uses two different sensing areas. The resulting sensor reduces complexity and power consumption making it suitable for implantable biomedical applications. The design is implemented in a standard 130nm process and the design constraints on sensitivity are explored. Analytical results based on theory show that sensor...
This research aims to prototype a small smart off-grid solar cell system. o provide an alternative electrical supply for a smart Lingzhi mushroom farm. This research applied the use of IOT with voltage and current sensors to measure and monitor the voltage of solar cell charging, amp (ampere) of current charging from the solar panel into a battery and (ampere) of current loading from a battery to...
Here, the utilizing of lateral unidirectional bipolar-type insulated-gate transistors (Lubistors) for pH detection was demonstrated for the first time. The high on current and ambipolarity of Lubistors are favorable properties for reliable sensing application. The ultrathin Lubistors were fabricated on 20-nm-thick SOI substrates in planar geometry. The triode-like current-voltage characteristic and...
This paper presents a battery-connected wireless ion sensing system comprising a Na+-selective electrode, a 406 pW Potentiometrie front end, a 780 pW reference-free asynchronous SAR ADC, a 2.4 GHz power oscillator-based transmitter that consumes 2.4 nW when transmitting 100 bps, a 485 pW quiescent power 1.8-to-0.6 V switched-capacitor DC-DC converter with 96.8% peak efficiency, and two temperature-stabilized...
This paper proposes Fault Detection, Isolation and Reconfiguration (FDIR) techniques to realize the connection of a DFIM pumped storage system with the grid in the presence of current and speed sensor failures. For the detection method authors use the parity space approach either for current sensor failure or the rotation speed one. The proposed reconfiguration techniques exploit stator flux estimation...
This paper presents a LED driver IC based on a self-resonant Hybrid-Switched Capacitor Converter (H-SCC) operating in the MHz range. Capacitors and switches of the LED driver are integrated on-chip in a low-cost 5V 0.18μm bulk CMOS technology. The effective chip area is 7.5mm2. A conventional SMD output capacitor and a 6.4 mm2 150nH SMD air-core inductor are enough to operate the driver in a compact...
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