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Please use this identifier to cite or link to this item: http://hdl.handle.net/2005/575

Title: Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage
Authors: Prakash, Daiva
Advisors: Ramanarayanan, V
Vijayanand, S
Keywords: Electric Power System
AC Voltage
Telecommunication Engineering
Alternating Electric Current
Power Converters
Telecom Power Supply
Boost Section Design
DC-DC Converter Design
Buck Converter
Boost Converter
Buck-Boost Converter
Power Density
Load Sharing Test
Submitted Date: Apr-2007
Series/Report no.: G21116
Abstract: In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power supply is a combination of AC-DC Rectifier coupled with a battery bank to support the load when AC input is not available. Figures 0.1 and 0.2 show the line diagram of the DC power supply. The power supply is the most critical element in a telecom installation and it should be highly reliable in order to have un-interrupted service. (Fig) Besides reliability, power density and cost are the driving forces behind the success of a power supply in the market. Off late, the reach of telecom in the society is very wide covering remote villages and major metros. Given this environment, the power supply is exposed to extreme input conditions. It is desirable to design the power supply capable of withstanding wide AC input conditions. Another advantage is that the rectifier unit will keep the battery charged so that the battery will have long life. This thesis is aimed at designing a 1400W (56V/25A) telecom power supply, keeping in view of the issues expressed above. The aim is to design a Switched Mode Rectifier (SMR) that tolerate wide input voltage variations (90Vac to 300Vac). In addition, the design covers unity input power factor, high efficiency (> 90%), high power density ( ), parallel operation and low cost ( ). Chapter 1 of this thesis covers the context and motivation of the work. Chapter 2 presents the design issues pertaining to power supplies. The normalized description of the power converters is presented. Such a description enables one to compare several circuit topologies in order to make effective design decisions. In a similar way the effectiveness of the switches and mgnetics are presented to enable design decisions in the output stage of the rectifier. Chapter 3 presents the design of the 1400W telecom power supply, keeping in view of the stated specifications. The performance results of the converter are presented in Chapter 4. All the design goals have been met. The design exercise has also given insights into possible further improvements. Contributions from this work and course of future development work are indicated in the concluding chapter.
URI: http://etd.iisc.ernet.in/handle/2005/575
Appears in Collections:Electrical Engineering (ee)

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