A high step down multiple output converter with wide input voltage range based on quasi two-stage architecture and dual-output llc resonant converter

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A High Step-Down Multiple Output
Converter with Wide Input Voltage Range
Based on Quasi Two-Stage Architecture and
Dual-Output LLC Resonant Converter
Abstract
The two-stage architecture is a good candidate for the wide
and-high input, multiple-and-low output applications. It has
been proven that, although additional loss is introduced by the
first-stage bus converter, the efficiency can still be improved
with a very-high-frequency second-stage point-of-load (PoL)
converter by reducing the intermediate bus voltage and using
low-voltage-rating devices. If the input voltage range is narrow,
a very high efficiency unregulated dc–dc transformer (DCX) can
be employed as the front-end converter, because the unregulated
converter can be designed at its optima operation point to
achieve the highest efficiency.
Existing system
Synchronous rectifiers are used to improve the efficiency.
Considering the voltage stresses on the switches, a full-bridge
rectifier is used for the VBus1, and a center-tapped rectifier is

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LeMeniz Infotech
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Pondicherry-605 005.
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Mail : projects@lemenizinfotech.com
used for the VBus2. Therefore, two secondary windings and six
synchronous-rectifying switches have to be used in the front-end
converter.
Proposed system
A multiple output dc–dc converter based on quasi two-
stage architecture has been proposed in this letter. By connecting
the input and output of the dc-DCX in series, 20%–25% ratio of
the total input power is directly fed to the intermediate bus
without conversion. Hence, the devices’ voltage stresses and
transformer turns ratio of the dc-DCX can be reduced and high
efficiency achieved for the front-end bus converter. By adopting
the semi regulation control scheme, optimized intermediate bus
voltages are provided for the second-stage PoL converters while
considering the tradeoff between the efficiencies of the frontend
converter and PoL converters.

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LeMeniz Infotech
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Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
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Mail : projects@lemenizinfotech.com
Advantages
 Less number of switches.
Applications
 Aerospace and telecommunication applications.
 Satellite power system.

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Block diagram:
BUFFER
circuit
5VDC
PIC controller
circuit
Gate driver circuit 12 V
DC
Output 1
Output 2
resonant
Circuit
Synchronous
rectifier
Centre
tapped
transformer
Full bridge
inverter
INPUT
DC supply

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Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.

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