270 V DC system-a highly efficient and reliable power supply system for both telecom and datacom systems

Yamashita, Takashi; Muroyama, S.; Furubo, S.; Ohtsu, S.

doi:10.1109/intlec.1999.794002

Cited by 29 publications

(12 citation statements)

References 2 publications

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“…At least three conversion stages from the AC input to the load are required to achieve this voltage level, which reduces the system efficiency. In references [28][29][30][31][32][33][34][35][36], different voltage levels have been proposed for a DC bus based on efficiency, cost, and reliability considerations. In references [3,4], three different power architectures, namely conventional AC architecture, rack-level DC architecture, and facility-level DC architecture, have been described that are commonly utilized in data and telecom centers.…”

Section: Source DC Load Ac Load Acwc Loadmentioning

confidence: 99%

An Overview of Direct Current Distribution System Architectures & Benefits

et al. 2018

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This paper examines existing and future direct current (DC) distribution systems with a wide range of applications in data centers, telecommunication systems, commercial buildings, residential homes, electric vehicles, spacecraft, and aircrafts. DC distribution systems have many advantages and disadvantages over their alternating current (AC) counterparts. There are a few surviving examples of DC distribution systems; among them are the telecommunication systems and data centers that use the low-voltage 48 Vdc systems. However, recently, there has been a move towards higher DC bus voltages. In this paper, a comparative study of different DC distribution architectures and bus structures is presented and voltage level selection is discussed for maximizing system efficiency and reliability, reducing system costs, and increasing the flexibility of the system for future expansion. Furthermore, DC distribution systems are investigated from a safety standpoint and the current global market for these distribution systems is also discussed.

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Section: Source DC Load Ac Load Acwc Loadmentioning

confidence: 99%

An Overview of Direct Current Distribution System Architectures & Benefits

et al. 2018

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“…Telecommunication system commonly use 48 VDC, but as computers were introduced inside such equipment, they suffer from inefficiency, due to very high load currents. To overcome this problem, a 270-VDC power system was introduced [1], where results showed it to be superior to AC and 48-VDC systems. However, the efficiency gained in transmission due to the high voltage represents a great mismatch with the low voltage requirements of the components and peripherals in the system, making it impractical if not also hazardous and costly.…”

Section: Related Workmentioning

confidence: 99%

A Recursive Solution for Power-Transmission Loss in DC-Powered Networks

Kim

Chou

2014

Energies

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This article presents a recursive solution to the power-transmission loss in DC-powered networks. In such a network, the load cannot be modeled as a fixed equivalent resistance value, since the switching regulator may draw more or less current based on the actual supply voltage to meet the power demand. Although the power-transmission loss itself is simply I 2 R L , I, in turn, depends on the load's supply voltage, which, in turn, depends on I, making it impossible to derive a closed-form solution by classical resistive network analysis in general. The proposed approach is to first derive a closed-form solution to I in the one-node topology using the quadratic formula. Next, we extend our solution to a locally daisy-chained (LDC) network, where the network is readily decomposable into stages, such that the solution combines the closed-form formula for the current stage with the recursive solution for the subsequent stages. We then generalize the LDC topology to trees. In practice, the solution converges quickly after a small number of iterations. It has been validated on real-life networks, such as power over controller area network (PoCAN).

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“…The energy storage, in most cases lead-acid batteries, can be directly connected to the power system. Using a dc power system increases the reliability compared with an ac power system since fewer components are required [25]. A dc power system for a data center can be configured in different ways.…”

Section: Data Center Power Systemmentioning

confidence: 99%

An Adaptive Control System for a Dc Microgrid for Data Centers

Salomonsson

Söder

Sannino³

2007

2007 IEEE Industry Applications Annual Meeting

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In this paper, an adaptive control system for a dc microgrid for data centers is proposed. Data centers call for electric power with high availability and a possibility to reduce the electric losses and hence the need for cooling. By using local energy sources, high reliability can be achieved, and by using dc the number of conversion steps, and therefore also the losses, can be reduced. The dc microgrid can also be used to supply closely located sensitive ac loads during outages on the utility grid. The proposed dc microgrid can be operated in eight different operation modes described here, resulting in 23 transitions. The adaptive control system coordinates the control of converters, sources and switches used in the dc microgrid. The adaptive control system is tested in the simulation software packages PSCAD/EMTDC, and the results of the most interesting operation modes and transitions are presented. The results show that it is possible to use the proposed dc microgrid to supply sensitive electronic loads, and also during utility grid outages, supply closely located sensitive ac loads. To reduce transients in the voltage experienced by the sensitive ac loads, the dc microgrid requires fast utility outage detection and fast switches.

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270 V DC system-a highly efficient and reliable power supply system for both telecom and datacom systems

Cited by 29 publications

References 2 publications

An Overview of Direct Current Distribution System Architectures & Benefits

An Overview of Direct Current Distribution System Architectures & Benefits

A Recursive Solution for Power-Transmission Loss in DC-Powered Networks

An Adaptive Control System for a Dc Microgrid for Data Centers

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