DC Articles
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What is the application scenario of Din Rail smart meter?
With the release of 5G network and the popularization of solar power, the market demand for DC meters is increasing. Smart DC meters can directly replace conventional measuring instruments. As an advanced intelligent and digital front-end collection element, this power meter has been widely used in various control systems. At present, DC meters in the market generally have problems of poor ...
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A high–output–current and low–power–loss thin–film transistor liquid–crystal display (TFT–LCD) driver for portable devices
The application range of traditional thin–film transistor (TFT) liquid–crystal display (LCD) drivers powered by switched–capacitor DC–DC converters (charge pumps) used in portable devices are, to a certain extent, restricted because of their inability to support applications that require high driving current for generating high resolution graphics or powering larger LCD panels. This paper reviews ...
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Overview of solid waste management in economically developing countries
Recently, protection of public health and of the environment by utilizing proper methods for the management of municipal solid wastes is gaining importance in economically developing countries (DCs). Inefficient collection methods, insufficient coverage of the collection system, combined with improper disposal of municipal solid wastes and contaminated sources of water supply, are major threats ...
By ORBIT e.V.
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Measure Voltage and Current Using a Data Logger
How to Record Accurate AC and DC Current and Voltage Measurements A common data logging application is to measure voltage and current flowing into or out of a piece of equipment, such as a user monitoring current in wind turbines. These measurements can be broadly classified into two groups: AC and DC. Depending on the levels involved, some data logger models can directly measure DC voltage and ...
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Space vector modulation based single stage inverter with maximum power point tracker for photovoltaic water pumping system
Photovoltaic (PV) water pumping systems commonly use permanent magnet dc motors because of their simple circuit configuration and control strategy. However these systems require frequent maintenance. On the other hand, PV pumps driven by ac motors employing a dc-dc converter followed by an inverter use more number of power semiconductor switches which will add to the cost of the system and suffer ...
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A PFC–based PMBLDCM drive for air–conditioner using half–bridge buck converter
A diode bridge fed buck half–bridge DC–DC converter fed from single–phase AC mains is used as a single–stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The PMBLDCM is used to drive a compressor load of an air conditioner through a three–phase VSI fed from a constant DC voltage. The speed of the ...
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Analog and Digital Drives for Chemical Feed Pumps
Dart Controls offers DC drives with the essential features required for water/wastewater and chemical feed applications. These drives integrate easily with PLC / SCADA systems providing 4-20mA signals for pump set speed. Advanced Digital DC drives offer verified actual speed feedback, diagnostic and process alarms and much more…. The 253G-200E-7 is our most popular DC drive. This ...
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Fuzzy maximum power extraction control for a photovoltaic water pumping system
AC loads present a delicate matter for photovoltaic systems, and this is because of the photovoltaic panel's operating point, which moves randomly according to irradiance changes; in this case, almost of photovoltaic water pumping systems use a DC–DC converter to ensure either the maximum power extracted from PV panel or the load needs. For AC motor pumps, an inverter must follow this chopper. ...
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Enhesa 2011 Forecast: Global Manufacturers at Risk of Product Environmental Regulations
Brussels/Washington DC (2011-02-23) - Increasing regulatory pressure requires new management approaches. Global Manufacturers are increasingly exposed to new product regulations. Environmental issues are, more than ever, making it to boardrooms. These are some of the conclusions drawn by Enhesa, a regulatory environment, health and safety (EHS) consultancy based in Brussels and Washington DC, ...
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Exploring the World of Immunology: An Insight into Dendritic Cell Culture
Dendritic cells (DCs) stand as the master architects of the immune system. They initiate and regulate a vast array of immune responses. As potent antigen-presenting cells, DCs are capable of priming naive T cells and regulating their differentiation into effector cells. Dendritic cell culture, therefore, plays a pivotal role in understanding and manipulating the immune system for therapeutic ...
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Electrodeionization (EDI) using Voltage Control
In electrodeionization, DC voltage is the force for driving ions out of the stream to be purified. Current is a result of the movement of ions. Both as a matter of physics and as a practical matter, SnowPure recommends using “Voltage Control” for EDI: set the DC voltage potential to the EDI system and walk away–let the current follow the ion load on the EDI. The physics say ...
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Design of simulator for modelling of wind turbine and transfer of maximum power using buck-boost converter
A small wind turbine simulator based on a separately excited DC motor-permanent magnet synchronous generator (PMSG) set has been proposed to evaluate the performance of the small wind turbine model. A DC shunt motor is used to produce varying aerodynamic power by varying field current with the help of an IGBT switch. The simulator is an equivalent gearless wind turbine model that fluctuate ...
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Technology transfer in the international climate negotiations – the state of play and suggestions for the way forward
Facilitating the transfer of climate technologies is one of the main elements of the ongoing climate change negotiations. Despite limited progress overall during COP 15 in Copenhagen, clear progress has been made on the issue of technology transfer. Challenging issues remain for future negotiations, but consensus is evident on several important features, including the establishment of a ...
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An adjustable speed PMBLDCM drive for air conditioner using PFC Zeta converter
In this paper a power factor correction (PFC) based Zeta converter fed voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive is employed for an air conditioner and controlled for its variable speed operation towards energy efficiency improvement. A single-phase single-switch AC-DC converter topology based on the Zeta converter is employed for power factor ...
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Effect of alternating and direct current in an electrocoagulation process on the removal of cadmium from water
The main objective of this study was to investigate the effects of AC and DC on the removal of cadmium from water using iron as anode and cathode. The various operating parameters on the removal efficiency of cadmium were investigated. The results showed that the optimum removal efficiency of 98.1 and 97.3% with the energy consumption of 0.734 and 1.413 kWh/kL was achieved at a current density of ...
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Third High Reservoir for DC Water - Case Study
Pressure washing and cleaning of the Third High Reservoir for DC Water and the Army Corps of ...
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Experimental and numerical study of a RF plasma source in a DC-grounded electrode configuration
Capacitively coupled plasma (CCP) sources have a variety of important applications, which make use of the interaction of active species (ions and radicals) created in the plasma volume with the surface materials of the electrodes. Due to the radio frequency (RF) excitation, the electrode materials are not restricted to be conducting, as RF current can flow through dielectric materials as well. ...
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Basic principles for urban water value assessment and price setting towards its full cost recovery – pinpointing the role of the water losses
This paper attempts to set the basic methodological framework for an integrated action plan (in terms of successive steps) to be developed that will guarantee the reliable calculation of the Full Water Cost (FWC), as defined by the WFD 2000/60/EC. Towards this goal, the crucial role of the water losses occurring in a water distribution system is demonstrated. This will help an effective and ...
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2-day Sensor and Control Workshop at DC Water - Case Study
DC Water is continuously looking into improving process efficiencies of the Blue Plains plant. A key part of DC Water’s improvement plan is an extensive research and development program including several pilot plants. On the operations side, upgrades of the process control strategies are foreseen. Both the research program and the operations upgrades will have to rely on accurate and robust ...
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Prefabricated Vertical Drains to dissipate excess pore pressures during Dynamic Compaction of Clayey Sands with 30-45% Fines Content
ABSTRACT: A proposed Electric Vehicle (EV) assembling facility, located in the Eastern Seaboard of Thailand, required soil improvement to enhance the mechanical properties of the clayey sands (SC). Albeit not the ideal soils for energy densification, Dynamic Compaction (DC) + Prefabricated Vertical Drains (PVD's) were chosen as the most suitable Soil Improvement technique to increase the strength ...
By CeTeau B.V.
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