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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...
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...
Aiming to improve energy saving in regard to data centers, the authors have developed a high-efficiency air conditioner for use in data centers. In consideration of application to data centers, which are considered “mission-critical” facilities, development of air conditioners using a refrigerant — which have no effect on ICT equipment even in the event of leakage — has been continuing. A key feature...
All electronic devices on the market have to comply with the valid standards regarding electromagnetic compatibility. This paper presents an efficient holistic procedure to analyze the surge voltage immunity of a modern power supply topology based on the bridgeless boost power factor correction stage. The procedure forms a structured process flow and allows a simple but effective analysis process...
As the energy crisis has become increasingly prominent, for power supply products, people's attention is no longer focused on CAPEX (Capital Expenditure) only; OPEX (Operating Expense) is also becoming more and more important. The constant pursuit of efficiency improving for power supply products has become an inevitable trend. This paper introduces a 3000W super high efficient rectifier module with...
For several years, the data rate and volume have increased continuously bringing more services, like TV on demand and Gaming. For fixed network, fibre to the home brings the higher data-rate and architecture is simple and reliable, however the replacement of last copper drop to customer has a high cost. In some case, it can be more economic to place broadband nodes such as MSAN (Multiple Services...
Modular UPS are usually presented as having an extremely high level of availability. In fact, the best modular UPS systems are designed to increase the global system's availability with minimum downtime due to their hot-swappable parts and cost-effective redundancy, the complete independence of each module and no fault propagation if one of the modules fails. However, the biggest concern is the internal...
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...
Outside Plant (OSP) wireless networks use both cabinets and shelters to house macro cellular site carrier communication and support equipment, such as 4G LTE base station radio gear, backhaul, DC power supply, battery storage, etc. Based upon real estate or deployment application restrictions, there will always be a need for some mix of cabinets and shelters. The focus of this paper shall be on both...
Increasing the energy self-consumption rate is an important challenge for economic improvement in a grid parity environment. Here, the construction of a power supply system that combines solar power generation and a storage battery system is detailed and the increase in the renewable energy self-consumption rate obtained by optimizing the charging and discharging of the storage battery is reported.
A gate drive printed circuit board (PCB) was developed for a 50-mm-wide modular-design thin power unit that uses two double-sided cooled power modules in an uninterruptible power system (UPS). A conventional gate drive PCB has a concentrated gate power supply circuit that uses a large transformer and has a conventional pulse open-phase detection circuit that occupies a large mounting area. Thus, the...
Energy storage is a key enabler for the integration of intermittent renewable energies especially within off-grid BTS energy supply systems. We propose a system using both, electrochemical and thermal cold storage for off-grid BTS energy supply. By the combination of both types of storages benefits with regard to increased energy efficiency can be generated. Among these are an increase in diesel generator...
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...
This paper will explore the concept of a self-configuring, self-healing and self-managing electric power network of distributed, largely renewable energy nano, micro and macro grids. Beginning at the building level of commercial and residential building power systems and including public and provide utility scale systems, and including the potential for intermediary independent service provider 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...
Today's inverters in homes are considered too large for homeowners, although they are typically only the size of a picnic cooler. If they were smaller, one believes that more homes would entertain using them for solar-power, as well as bringing electricity to remote areas of the world where electrical energy is not distributed. The key goal of this project was to reach an inverter power density in...
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