The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents an efficient monitoring solution for greenhouses. The solution implements the Wireless Sensor Network (WSN) monitoring system and then expands the monitoring concept to an Internet of Things (IoT) solution, by employing 3G access, web services, database and a web interface for user interaction. The main advantage of this modular monitoring system relies on the fact that the End-Devices...
Wireless communication is currently the trend in industrial environments, reducing costs and allowing the creation of applications that were impossible with legacy technologies. In this respect, the WirelessHART specification is emerging as a standard solution. Despite the direct benefits, a WirelessHART network exhibits a series of technical (reliability, energy consumption, tolerance to failures,...
Ethernet field bus has been designated as CAN successor both in automotive and agricultural applications by many international councils because of its high throughput and of the possibility to reuse standard technologies like the TCP/IP stack for a better integration with Internet of Things paradigm. This paper would like to present an essential element for the coexistence of this nets, necessary...
The Internet of Things (IoT) paradigm envisions an interconnected world where things can communicate with each other, transmit state information and execute smart tasks. The number of devices connected in Internet has been growing exponentially in the past years and the Machine-to-Machine (M2M) plays a major role in enabling IoT paradigm while it is expected that in the near future billion of devices...
Current sensing techniques are widely used for over current protection and current mode control of switching DC-DC converters for loop control. The major drawback with the conventional current sensing technique is that the accurate tuning of the low pass filter time constant with the inductor and its dc resistance (DCR) is required. However, this can hardly be guaranteed as the tuning depends on the...
This paper presents experimental results for a three-phase direct ac-ac converter based on switched capacitor principle in delta and wye configuration. This converter employs only capacitors and switches in the power stage, it has a fixed gain, it operates in open loop with constant duty cycle and constant switching frequency and the topology is bidirectional. One advantage of the proposed converter...
This paper presents the framework for integrating the lightweight clients with the heavyweight Enterprise Service Bus (ESB) messaging system via the HTTP-based RESTful API. A special gateway converts the ESB messages, which content is encoded in RDF according to the OWL ontology to standard HTTP requests with the JSON content and vice versa. Such a solution is developed within the European ARUM project...
Microgrids appear as a key-solution to manage smart grids with high penetration of renewable energy generation and non-linear and unbalanced loads. Their flexibility allows the energy exchange with the utility network in grid-connected mode or the transition to an islanded operation mode from the main grid in case of disturbances or faults. While in grid-connected mode the main grid imposes the frequency...
This paper describes a new high-efficiency and high-speed switching method of a MOSFET using a switching assist circuit fed by the gate drive power supply. By applying the proposed circuit to a chopper and an inverter, a turn-off time of the MOSFET can be effectively reduced, which allows a higher-frequency operation and reduction of the turn-on loss. In the case of the application to the inverter,...
More than 50 billion devices are estimated to be connected to the Internet by 2020. Incompatibility of devices and protocols (usually proprietary devices and protocols) are one of the major hurdles to be overcome to realise the Internet of Things (IoT) vision. IoT devices are typically constrained devices and this creates dependencies between the hardware, software and protocols used in the device...
In modern drive applications fed by voltage source inverters, monitoring systems are of advantage to reduce the maintenance costs and prevent outages. The proposed insulation monitoring method detects stator insulation defects by evaluating the current's transient response after step excitation by the inverter. Due to fast switching of the voltage source inverter at high output voltage dv/dt rates,...
In the recent past, we have observed great advances in the way that people are connected, from social networks to small smart devices At the same time, we are entering the era of smart cities and the internet of things, where sustainability and quality of life are key concerns. Despite these trends, we did not observe an equal level of adoption of technologies or services that leverage the automation...
We propose an enhancement of OpenADR (Automated Demand Response) communication for flexible and fast ADR aggregation using the TRAP mechanism of newly developed IEEE1888 facility information access protocol. The TRAP mechanism makes it possible for an OpenADR server to push an occurrence of specific event for which the "TRAP" has been previously set by each client. Each client such as an...
With the development in silicon carbide (SiC) power device technology, the prospects of SiC to replace silicon (Si) in HEVs are increasing. Through this paper the authors have tried to highlight the practical challenges associated with the thermal aspect and switching EMI of SiC inverter. To assess the quality of upcoming devices, a statistical analysis of the normally-on SiC JFETs is performed. Experimentally...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.