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The explosive growth of mobile applications requires more bandwidth, which, in turn, requires more energy as well as additional investments in network infrastructure-money that service providers must find ways to recover.
While the application space for WiMAX has seen fast growth in recent years, on-chip digital circuits and high frequency switching converters have resulted in power supply noise with high frequency spectral content, which jeopardizes the reliability of sensitive WiMAX analog front ends. As a cost-effective solution, this paper presents a low dropout (LDO) regulator design, which achieves high PSRR...
This paper concentrates on a new high-order output filter, named LLCL filter, and its application issues on the three-phase three-wire shunt active power filter (SAPF). The LLCL topology is constructed by replacing the capacitor of the traditional LCL filter with an LC branch that resonant at the switching frequency. The SAPF with an LLCL filter exhibits excellent switching frequency harmonic attenuation...
This paper addresses the reliability and availability of uninterruptable power supply systems (UPS) used in modern datacenters and telecom core infrastructure. As 380V DC power distribution systems are gaining wider acceptance, it is expected that they meet high standards imposed by the industry in terms of reliability and availability. In this paper, reliability and availability of AC UPS topologies...
The paper presents a review of different structures used for the power conditioning system of renewable energy sources. The advantages and disadvantages of each architecture are discussed in detail. Therefore, this paper gives a good insight in order to choose the appropriate architecture for a particular power conditioning system.
This paper presents a new analysis methodology to quantify the output current and output capacitor ripple current for the interleaved boost converter with an arbitrary number of phases operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). As the result, all the possible output waveforms of the output current are presented. This analysis result can be used as a...
With the development of telecom industry, the solution of energy saving and CO2 emission reduction ha become a hot topic since competitiveness and socia responsibility is more and more important. According to data statistics, cooling system has consumed up to 50% of tota energy consumption to maintain battery temperature at around 25°C by air conditioner.
We present a quantitative analysis of the benefits of the 380 VDC power distribution system compared to the current −48-VDC power supply system. The analysis is based on models of typical distribution configurations in global telecommunication sites and takes into account codes, regulations, and practices for wiring and voltage drop comparison between centralized/decentralized 48- and 380-VDC. In...
The purpose of this paper is to present a new digital control switching power supply for the HVDC system in data center. The two stage converters are proposed to address the problem of input voltage drop. It consists of the boost converter and the phase-shifted full bridge converter. Since the first stage boost converter make the output voltage constant, good regulation characteristics against the...
With the advent of increasing energy cost from the grid, need to go were no grid is or having to rely upon no grid, we have seen the emergence of hybrid solutions. With the beginnings of these new solutions, we see different business objectives, customer service expectations, municipal limitations and neighbourhood conditions that vary from carrier, region, site, et cetera. The result is that hybrid...
Wireless power transfer (WPT) via magnetic resonant coupling has been attracting research attention for various applications. Conventionally, load is assumed to be constant and only transfer efficiency is studied. In actual WPT applications, the load and transfer distance change frequently. Furthermore, information such as ratio of input voltage to output voltage, ratio of input current to output...
Wireless power transfer via magnetic resonant coupling has been extensively researched for various applications. Impedance matching is implemented so that the transfer system is resilient to positional changed and load changed. Recently powering multiple loads simultaneously is becoming the focus in wireless power transfer researches and designs. Apart from maintaining high efficiency, controllable...
Uninterruptible power supplies (UPSs) are widely used to overcome instantaneous voltage drops and complete power failures. This paper proposes a novel single-phase standby UPS with a small size and high reliability. The proposed UPS consists of a buck-boost converter and a full-bridge inverter; this device eliminates the need for bulky electrolytic capacitors or output LC-filtering. The buck-boost...
A consideration of short-circuit protection in high voltage direct current (HVDC) distribution system is written in this paper. There are some types of energy sources in HVDC system, and the behavior of short-circuit current is affected by the way to rectify. Therefore, it may be more complicated to protect short-circuit in HVDC system than it is in AC system. In this study, a protection technique...
Thermal management of data centers becomes a major issue as the power dissipated by the telecommunication equipments, has dramatically increased, leading to hot spots and to huge overall energy consumption. This paper concerns a new architecture for data centre. Data centres were often built in a classical way without any optimization. Due to growing energy consumption, studies must been done in order...
Data throughput demands of fourth generation telecommunication systems have acted as a stimulus for a paradigm shift of the cell tower structure. This paradigm shift has included the implementation of the fiber-to-the-antenna (FTTA) architecture. FTTA architecture implementation has enabled lower power requirements, distributed antenna sites and a smaller base station footprint when compared to conventional...
This paper reports test results and reviews for the developed plug and socket-outlet applied to the 400 Vdc power systems expected to improve energy efficiency in communication sites, data centers, commercial buildings, and smart energy systems. However, there are some safety issues to use 400 Vdc power. The plug and socket outlet has a unique mechanism based on combination of a permanent magnet and...
This paper proposes a method for reconstructing the three-phase voltage output of a current source inverter (CSI). The method produces a three-phase voltage by using the DC-link voltage and the switching pattern of the CSI and improves the reconstructed waveform by using the delay time of a filter. The proposed method can reduce errors between the actual voltage and the reconstructed voltage at the...
The low input current ripple and high efficiency are two of the most important criteria for the interleaved boost converter interface in Photovoltaic / Fuel Cell Power Conditioning System. This paper analyzes the input current ripple of the interleaved boost converter and its effect on power loss from the view of a practical design. Therefore, design considerations of the input current ripple minimization...
Thermal runaway scares the heck out of many people; especially those that do not know how to detect that the conditions are being set for a thermal runaway. While thermal runaway can occur in most battery chemistries such as lead acid either VLA or VRLA, or Ni-Cad, or Lithium Ion, this paper is going to restrict itself to the VRLA technology.
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