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Internet of things (IoT) is a smart technology that connects anything anywhere at any time. Such ubiquitous nature of IoT is responsible for draining out energy from its resources. Therefore, the energy efficiency of IoT resources has emerged as a major research issue. In this paper, an energy-efficien t architecture for IoT has been proposed, which consists of three layers, namely, sensing and control,...
Design and Implication of the great-capacity automatic charging equipment for storage battery controlled by DSP is introduced in this paper. Grounded on the HF SPS (High-Frequency Switching Power Supply), design and implementation of software/hardware is introduced for the digital-signal controller based on a TMS320LF2407. At the beginning of software design, the tool-box of simulink is used in Matlab,...
Supercapacitors (SCs) are promising energy storage devices not only for high-power applications but also as alternatives to secondary batteries. Since the energy density of the SCs is low and their voltage varies widely, their energy should be delivered to load efficiently over a wide voltage range. This paper proposes a novel SC reconfiguration technique by which SC module voltage is roughly regulated...
Power quality is an important subject to correctly dimension protection devices and back up power systems for next generation of telecommunication network. In this paper it is presented an overview of some power quality data obtained using integrated instruments put inside Chloride's UPS, widely distributed in the world and active for quite a few years, allow statistical evaluations to derive some...
This article introduces the hardware and software structure of the new RF repast management system. It describes in detail the circuits of each module and the figures of software control flow. The system is tested and it is proved that the system is accuracy, stability and safety.
This paper proposes utilisation of polymorphic electronics to design dependable digital circuit controllers. The controller of a general digital circuit is an implementation of a finite state machine. One of most popular implementation is based on a synchronous digital counter. The counter consists of flip-flops and some glue logic. In proposed approach, the glue logic is designed using polymorphic...
In order to solve the problem of short continuous driving mileage and long charging time of electric vehicle (EV), the method of auto and rapid exchange system of EV battery cases is proposed. The exchange system deals with corresponding control of multi-components which are relatively moving each other. Based on single chip wireless transceiver nRF905 and MC68HC908GZ16, the wireless communication...
This article presents an approach for balancing serially connected battery strings with high efficiency energy transferred. The efficiency of this balancing process is accomplished by channeling an excess energy through a DC Link Bus rather than done serially. Using this proposed technique with converter which was 80 percent efficiency, the equalized efficiency of balancing process is increased more...
The benefits of enhanced condition monitoring in the asset management of the electricity transmission infrastructure are increasingly being exploited by the grid operators. Adding more sensors helps to track the plant health more accurately. However, the installation or operating costs of any additional sensors could outweigh the benefits they bring due to the requirement for new cabling or battery...
The back-up power supply of a tramcar can be boosted and/or redimensioned by refurnishing the existing batteries with peak power storage elements such as ultracapacitors. As a result, the primary battery's lifetime increases and overall reliability is improved, which is essential regarding passengers' safety in some critical circumstances like emergency braking. The current paper points out existing...
The present paper presents considerations on using a low power routing solution for prolonging the battery life for motes within a wireless sensor network (WSN) without affecting the network connectivity. The solution applies for the cases when, the distances between motes and base stations are over the mote's communication range, and motes located between sinks and base station are commonly used...
This paper presents a dynamical control of fuel cell and battery hybrid system to supply a frequently changing load. In this paper, a hybrid system is built in order to solve a big problem that the voltage will drop when PEM fuel cell current increases: the fuel cell is used to supply the rated power to the load, a Lithium battery will supply peak power that the load demands, meanwhile, the fuel cell...
In coming ubiquitous network society, a user who has no knowledge about network technology might have to manage his/her network including information appliances and sensor networks. Current network is, however, too difficult to manage because protocols to access ubiquitous network devices are not same and it is not easy to identify the cause of problems if a network failure occurs. Toward uniting...
This paper presents a novel modulation for a two-stage dc-ac power converter with high-frequency isolation installed in a photovoltaic stand-alone system. The presented modulation, which is designed for the converter discontinuous conduction mode of operation, solves the problem of connection to a grid, and permits a bidirectional power flow. In this document is described the modulation strategy and...
In this paper a precise and simple methodology will be introduced for modeling and calculating the voltage source inverter (VSI) losses in hybrid electric vehicles (HEV) application. The noteworthy traction inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall efficiency and obtaining the optimized value of its dc-link voltage as...
The charging methods for stationary accumulators for use in telecommunication installations have changed through out the years. The reason for this is not only the development and the achievements in the battery technology field and the new methods and components in the control area but also the better knowledge of demands and result of the operation and maintenance work in the field. From the administrations...
A decision must be made now or in the near future regarding DC power replacements for existing 7000 A.H. batteries which are nearing end-of-life. For many telephone companies, the decision will be based on balancing the needs of existing mechanical switches while maintaining an appropriate power posture to meet the more stringent system voltage window of planned electronic switch upgrade. This requires...
This paper discusses the requirements within the Power Equipment Rack for a form of electronic power convertor whose function is to provide regulation of the widely varying -48V supply, for circuits intolerant, of the wide voltage limits. The requirements of cost and efficiency which must apply to such equipment are examined. The advantages offered by electronic methods of control over the traditional...
A high efficiency and economical arrangement for providing power to computers with 400 Hz CPU requirements is introduced. The system utilizes a conventional 60 Hz static switching bypass type 60 Hz UPS connected to a common battery with a switching type redundant 400 Hz solid state UPS thus eliminating the double conversion losses and lower efficiency of an added rotary frequency converter. A method...
The High Frequency (HF) DC Triport is a new power supply concept intended for applications requiring uninterruptable regulated DC energy. The HF DC Triport conditions and transmits energy to a load from two independent energy sources, the commercial AC line and a battery. The HF DC Triport is an alternative power supply arrangement to a conventional rectifier-battery system. The advantages of this...
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