scholarly journals DC UPS for Critical Loads

2015 ◽  
Vol 5 (2) ◽  
pp. 231
Author(s):  
Ganesh S ◽  
Chiranjit Ghosh T ◽  
Kokilasree R ◽  
Nandhakumar M ◽  
Md Haroon Alim T
Keyword(s):  
Power Supply ◽  
Low Cost ◽  
Uninterruptible Power Supply ◽  
Critical Data ◽  
Power Failure ◽  
Switching Losses ◽  
Dc Power ◽  
Full Power ◽  
Switched Mode Power Supply ◽  
Uninterruptible Power

<p>The usual way to avoid a computer shutdown during a mains failure is to connect an  uninterruptible power supply system (UPS), which can be suitably modified and fitted inside the computer cabinet by the use of proposed methodology known as a dc UPS.  Conventional desk top UPS systems store electricity in form of chemical energy in batteries and when ever mains fail the batteries provide DC power which is then converter to ac by inverter and then fed to the computer in order to save critical data.  Thus power from mains or from UPS is fed to switched mode power supply unit which converts it to dc to  supply the computer motherboard and accessories.  Leaving the case of the computer powered by mains, duing power failure the dc power is unnecessarily converted to ac and then to dc again in SMPS hence high switching losses and heat is produced there by making the entire system very lowe efficient.  In this work it is proposed to directly feed the dc power from the battery to the computer SMPS system by building a UPS arrangement within the computer system.  This not noly saves space, it is highly efficient compared to the conventional ups system, easy to carry, low cost and reliable since there is no change over operation is required/.  A complete design of an ac to dc power supply with an internal dc UPS is presented in this paper. . A prototype has been fully developed and tested as a PC power supply. Thus the result is achieved at full power about 6-8 minutes.</p>

Information Technology in Circuit Design of On-Line UPS

2014 ◽  
Vol 886 ◽  
pp. 505-508
Author(s):  
Chun Juan Han ◽  
Fa Cheng Rui ◽  
Sheng Liu ◽  
Shou Qin Tang
Keyword(s):  
Circuit Design ◽  
Power Supply ◽  
Information Industry ◽  
Uninterruptible Power Supply ◽  
Computer Communication ◽  
Power Failure ◽  
Modern Development ◽  
On Line ◽  
Quality And Reliability ◽  
Uninterruptible Power

Uninterruptible Power Supply plays an important role in critical load, such as: computer, communication system and hospital. They can provide reliable and pure power supply for loads neither power good or not. With the best performance, on- Line UPS provider most sufficient protection for loads power failure in various UPS. With the continuous development of power electronics technology and information industry, this article design a high quality and reliability UPS to meet modern development of science and technology.

Warning! Fire in the ICU

2014 ◽  
Vol 29 (3) ◽  
pp. 339-340 ◽  
Author(s):  
Fabio Rispoli ◽  
Michele Iannuzzi ◽  
Edoardo De Robertis ◽  
Ornella Piazza ◽  
Giuseppe Servillo ◽  
...  
Keyword(s):  
Power Supply ◽  
University Hospital ◽  
Alarm System ◽  
Hospital Emergency ◽  
Publication Type ◽  
Uninterruptible Power Supply ◽  
Staff Members ◽  
Emergency Procedures ◽  
Power Failure ◽  
Uninterruptible Power

AbstractAt 5:30 pm on December 17, 2010, shortly after a power failure, smoke filled the Intensive Care Unit (ICU) of Federico II University Hospital in Naples, Italy, triggering the hospital emergency alarm system. Immediately, staff began emergency procedures and alerted rescue teams. All patients were transferred without harm. The smoke caused pharyngeal and conjunctival irritation in some staff members. After a brief investigation, firefighters discovered the cause of the fire was a failure of the Uninterruptible Power Supply (UPS).RispoliF, IannuzziM, De RobertisE, PiazzaO, ServilloG, TufanoR. Warning! Fire in the ICU. Prehosp Disaster Med. 2014;29(3):1-2.

scholarly journals Methods and means of increasing the reliability of computerized modular uninterruptible power supply system

2020 ◽  
Vol 99 (3) ◽  
pp. 133-141
Author(s):  
A. Palamar
Keyword(s):  
Control System ◽  
Simulation Model ◽  
Power Supply ◽  
Control Logic ◽  
Uninterruptible Power Supply ◽  
Dc Power ◽  
Power Modules ◽  
Simulation Results ◽  
Dc Power Supply ◽  
Uninterruptible Power

The problem of development and implementation of a simple and effective method of the rectifiers operation control for the modular uninterruptible DC power supply unit in order to increase its reliability is considered in this paper. The main idea of the method is to control the process of cyclic shifting of the switched-on power modules of the uninterruptible power supply by series switching into operation of each subsequent module from their unloaded reserve and switching out the previous one. The paper presents the control system structure where in addition to the central control module, it is proposed to add the control unit for power modules, which is responsible for implementing the process of their switching on and monitors their condition. In order to investigate the effectiveness of the proposed method, computer simulation model describing the power modules control logic is developed. The Simulink visual modeling environment and the mathematical tools of the Stateflow library component using state and transition diagrams are used in order to develop the simulation model. The developed simulation model is tested and the simulation results are given in the form of time diagrams of state change. The іmplementation of the developed method, due to the uniform reduction of the period during which the power modules of the uninterruptible power supply are on the switched-on loaded state, makes it possible to increase their operating time to failure, which in turn increases its reliability without deteriorating energy efficiency. The simulation results demonstrate the efficiency of the developed algorithm in various system operation modes. Based on the proposed method, hardware and software which is implemented as a part of intelligent computerized control system for uninterruptible DC power supply is created.

A Single-Stage DC Uninterruptible Power Supply

2015 ◽  
Vol 764-765 ◽  
pp. 466-470
Author(s):  
Maoh Chin Jiang ◽  
Bing Jyun Shih
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Cost ◽  
Single Stage ◽  
Normal Operation ◽  
Uninterruptible Power Supply ◽  
Sinusoidal Input ◽  
Uninterruptible Power

A single-stage DC uninterruptible power supply (UPS) is proposed in this paper. Basically, the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost for extra UPS function. Under normal operation, a novel two-switch SEPIC converter operates as an ac to dc converter with sinusoidal input current, unity power factor, and low ripple dc output voltage, and as a battery charger if a battery is added. Since both the input boost supply and the output supply can be controlled independently, a fast transient response can be maintained at both the input for active current wave shaping and at the output for good output regulation. When the ac source is in an outage condition, the proposed converter functions as a dc-to-dc buck-boost converter; therefore, the desired dc output voltage can be provided. Finally, some experimental results are presented for verification.

scholarly journals Design and Modeling of Highly Power efficient Node-level DC UPS

1970 ◽  
Vol 7 (1) ◽  
pp. 59-62
Author(s):  
Wonok Kwon
Keyword(s):  
Power Supply ◽  
Uninterruptible Power Supply ◽  
Power Efficient ◽  
Dc System ◽  
Highly Efficient ◽  
Dc Power ◽  
Node Level ◽  
Uninterruptible Power ◽  
Power Architecture

This paper presents design and modeling of a highly efficient node-level DC uninterruptible power supply (UPS) in rack-level DC power architecture. In the previous research, we proposed the architecture of the highly efficient rack-level DC system combined with node-level DC UPS. This paper deals with the design and modeling of proposed node-level DC UPS.

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