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Telecom Italia's Network Operation Area Technical Infrastructures Engineering Department is responsible for developing, installing and for the maintenance of telecommunication infrastructures. Due to the very high level of energy consumption and athmosphere emissions, the Telecom Italia Technical Infrastructures Engineering Department needs to: ▸ continue maintenance to improve performance and quality;...
Reduction of power use in telecommunications building has become a social responsibility as a means of reducing the level of atmospheric CO2 that is a cause of global warming and to counter rising costs of electricity. One means of reducing power consumption is to introduce HVDC systems. This paper reports the issues involved in studying a multi-output HVDC/48Vdc power supply system and presents the...
Software Defined Networks are characterized by disaggregation of hardware, specifically large monolithic equipment containing all functions is replaced by smaller equipment whose functions can be dynamically allocated as needed by the network. Disaggregation presents powering problems that are different from traditional telecom powering of larger discretely wired loads. One problem is reliably and...
In this paper an innovative energy management system for telecom energy network is introduced which is specially designed to help customers understand the key working information, know the bottleneck and improve O&M (Operation and Maintenance) efficiency of whole network. The system can provide customers with “Intelligent & Integrated & Internet” energy management and reduce their TCO...
Power consumption of the ICT sector of information and communication facilities and data centers has grown, and this has led to a need to improve energy efficiency of these facilities. DC distribution systems employing 380 VDC as the supply voltage is one promising approach to address this problem, countries around the world and are progressing to develop and deploy commercial services. We demonstrated...
Rapidly growing cellular bandwidth demand has driven the deployment of smaller and smaller micro/nano cell wireless base-stations. Many of these deployments are in places that may be remote, hard-to-reach, environmentally uncontrolled, or near humans where noise and aesthetics may be important. As a result, new requirements have emerged: higher reliability, easier installation and repair in difficult...
This paper presents the investigation of the effects of Silicon-Carbide Schottky Barrier Diodes (SiC SBDs) on the switching transient performance of a SiC MOSFETs-based Bidirectional Switching Power Pole (BSPP). The investigation was focused on the contribution of the SiC SBDs in reducing the overshoot in the drain current when they are connected as freewheeling diodes. A double pulse test (DPT) is...
The aim of this paper is to present a superior transient response of a digital peak current mode dc-dc converter in order to address input voltage fluctuation. In the dc power feeding system, a quick response is important for not only load fluctuation but also input voltage fluctuation. Since the proposed peak current mode control method can detect the peak current in real time, the transient response...
The basic characteristics of a 400 VDC appliance coupler for use in the power input module of ICT equipment in data centers and similar facilities are reported. When ICT equipment is powered at 400 VDC, the electrical characteristics differ from when conventional AC power is used and greater safety considerations are required. To maintain safety, the appliance coupler used in this evaluation is equipped...
This paper presents the design and analysis of an active energy recovery clamp circuit for an isolated full bridge dc-dc converter. The proposed energy recovery circuit is implemented on a 130V to 52V isolated dc-dc GaN converter. Initially an RCD circuit is used at the output rectifier to reduce the voltage spike from exceeding the desired value. Later, an active energy recovery circuit which includes...
Because of the increasing power density of IDC, the backup of the refrigeration system is becoming more and more important. Once the power system failure, the servers can continue to run on the UPS system. After the refrigeration system stops running, the room temperature will rise rapidly, and the servers will be overheat and stop running. The equipment maintenance method and operation errors may...
Huge amount of energy is consumed by a typical telecommunication base station in order to keep the indoor climate temperature low enough to avoid any damage to IT/electronic equipment. By increasing the number telecommunication base stations applying more energy efficient cooling strategies are urgently needed. Free cooling either in direct approach (e.g. extracting fresh air), or indirect approach...
The future electricity grid for the electric power distribution network is slowly moving in the direction of dc transmission. In order to prevent the fault propagation, provide protection against overload and fault, and isolate the faulty load in a dc power network, an overcurrent protection device must be applied to the switch gear for electric power management and control of the systems. Overcurrent...
Due to their low switching and conduction losses, Gallium Nitride (GaN) transistors are inherent candidates in hard-switched power converter topologies. The performance of five different GaN transistors in a Totem-Pole Power Factor Controlled (PFC) rectifier is compared by circuit simulation using transistor models parameterized by measurements with the double-pulse test. This is supplemented by calorimetric...
The purpose of this paper is to analyze the dynamic characteristics of proposed digital peak current mode dc-dc converter. The waveforms of the output voltage and the reactor current are derived by the small signal analysis. They are compared with simulation results assuming an actual large amplitude operation. It is confirmed that the tendency of the transient response is indicated based on the analysis...
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