Development of efficient power supply For low voltage high current Applications

By: K, AroulContributor(s): Panda, Anup Kumar [Supervisor] | Department of Electrical EngineeringMaterial type: TextTextLanguage: English Publisher: 2009Description: 85 pSubject(s): Engineering and Technology | Electrical Engineering | Power ElectronicsOnline resources: Click here to access online Dissertation note: Thesis (M.Tech (R))- National Institute of Technology, Rourkela Summary: In order to meet demands for faster a nd more efficient data processing, modern microprocessors are being designed with lo wer voltage implementa tions. The continuous packing of more devices on a single processor chip is increasing its current demands calling for an aggressive power management. These de mands, in turn require special power supplies to provide lower voltages with higher cu rrents capabilities for microprocessors. This work presents a modified low voltage high current Voltage Regulator Module (VRM) technology for desktop computers, a nd portable applications. The developed advanced VRM has advantages over conventiona l ones in power effici ency and reliability. The SMPS outputs of desktop computers are mainly േ5ܸ,േ12ܸ. Considering the factor of distribution loss for today’s processors +12V input supply is used instead of +5V and then it is step down to 1.2V . To make this dc/dc conversi on efficient at lower voltages, synchronous converter is an obvious choice beca use of lower conduction loss in the diode. Primarily the various losses occurring in Synchronous Buck Converter (SBC) is analyzed mathematically. The results concl ude the dominance of the switching loss on the high side MOSFET. ZVT, the most efficient among the soft switching techniques is employed to the SBC. The suggested Zero Voltage Transition (Z VT) Single Phase SBC is simulated using PSIM for design values of 3.3V, 12A output a nd switching frequency 200 kHz. The proposed converter exhibits an efficien t performance in comparison with the conventional converter. Additionally, the resonant auxi liary circuit in ZVT, which conducts for a short period of time, is also devoid of the switching loss. The simulation results are then verified viii experimentally by developing a prototype of the proposed converter for a switching frequency of 200 kHz. With this satisfactory result, a ZV T MSBC (Multiphase Synchronous Buck Converter) is designed for 1.2V, 90A output switching at 500 kHz . The simulated results present a much better performance than th e conventional MSBC. ZV T Techniques are only employed mostly for high power converters. A ve ry few work in the literatures has applied them in the low powers. The increase in the e fficiency of low power ci rcuits (such as SBC) by applying ZVT technique is real ized in this dissertation. KEYWORDS – dc/dc converter, Synchronous Buck C onverter, Voltage Regulator Module, Zero Voltage Transition, Multiphase Synchr onous Buck Converter, PSIM, Switching Loss, Microprocessor, Desktop Comput ers, Portable Applications.
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Thesis (Ph.D/M.Tech R) Thesis (Ph.D/M.Tech R) BP Central Library
Thesis Section
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Thesis (M.Tech (R))- National Institute of Technology, Rourkela

In order to meet demands for faster a
nd more efficient data processing, modern
microprocessors are being designed with lo
wer voltage implementa
tions. The continuous
packing of more devices on a single processor
chip is increasing its current demands calling
for an aggressive power management. These de
mands, in turn require
special power supplies
to provide lower voltages with higher cu
rrents capabilities for microprocessors.
This work presents a modified low voltage
high current Voltage Regulator Module
(VRM) technology for desktop computers, a
nd portable applications. The developed
advanced VRM has advantages over conventiona
l ones in power effici
ency and reliability.
The SMPS outputs of desktop computers are mainly
േ5ܸ,േ12ܸ.
Considering the
factor of distribution loss for
today’s processors +12V input
supply is used instead of +5V
and then it is step down to 1.2V
. To make this dc/dc conversi
on efficient at
lower voltages,
synchronous converter is an obvious choice beca
use of lower conduction loss in the diode.
Primarily the various losses occurring in
Synchronous Buck Converter (SBC) is
analyzed mathematically. The results concl
ude the dominance of the switching loss on the
high side MOSFET. ZVT, the
most efficient among the soft
switching techniques is
employed to the SBC.
The suggested Zero Voltage Transition (Z
VT) Single Phase SBC
is simulated using
PSIM for design values of 3.3V, 12A output a
nd switching frequency 200 kHz. The proposed
converter exhibits an efficien
t performance in comparison with
the conventional converter.
Additionally, the resonant auxi
liary circuit in ZVT, which conducts for a short period of
time, is also devoid of the switching loss. The simulation results are then verified
viii
experimentally by developing a prototype of
the proposed converter for a switching
frequency of 200 kHz.
With this satisfactory result, a ZV
T MSBC (Multiphase Synchronous Buck
Converter) is designed for 1.2V,
90A output switching at 500 kHz
.
The simulated results
present a much better performance than th
e conventional MSBC. ZV
T Techniques are only
employed mostly for high power converters. A ve
ry few work in the literatures has applied
them in the low powers. The increase in the e
fficiency of low power ci
rcuits (such as SBC)
by applying ZVT technique is real
ized in this dissertation.
KEYWORDS

dc/dc converter, Synchronous Buck C
onverter, Voltage Regulator Module,
Zero Voltage Transition, Multiphase Synchr
onous Buck Converter, PSIM, Switching Loss,
Microprocessor, Desktop Comput
ers, Portable Applications.

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