A high gain input parallel output-series dcdc converter with dual coupled inductors

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A High Gain Input-Parallel Output-Series
DC/DC Converter with Dual Coupled
Inductors
Abstract
Introduction:
In order to handle high input currents and reduce current
ripples, the three-state switching cell based on interleaved
control is introduced in boost converters. However, the voltage
gain of the conventional three-state switching boost converter is
only determined by the duty ratio. Moreover, the voltage
stresses of the power devices are still equivalent to output
voltage. Thus, the large duty ratios, high switch voltage stresses,
and serious output diode reverse recovery problem are still
major challenges for high step up and high power conversion
with satisfactory efficiency. To solve aforementioned
drawbacks, some three-state switching converters with high
static gain employing diode–capacitor cells were presented.
However, several diode–capacitor cells are required to meet a
very high step-up gain. Thus, other topologies using three-state
switching cell and coupled inductors are investigated. An
interleaved boost converter with coupled inductors and a voltage
doubler rectifier is proposed in order to satisfy the high step-up

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applications and low input current ripple, in which the secondary
sides of two coupled inductors are connected in series. The
winding-cross-coupled inductors and output diode reverse-
recovery alleviation techniques are also introduced in an
interleaved three-state switching—dc–dc converters, which can
get a considerably high voltage conversion ratio and improve the
performance of the converter. An interleaved fly-back converter
based on three-state switching cell for high step up and high
power conversion is proposed. Although the converter can
eliminate the main limitations of the standard fly back, this
circuit is a little complex and the input current ripples are large
from the experimental results.
Existing system:
Conventional step-up converters, such as the boost
converter and flyback converter, cannot achieve a high step-up
conversion with high efficiency because of the resistances of
elements or leakage inductance; also, the voltage stresses are
large. A boost converter (step-up converter) is a DC-to-DC
power converter with an output voltage greater than its input
voltage. It is a class of switched-mode power supply (SMPS)
containing at least two semiconductors (a diode and a transistor)
and at least one energy storage element, a capacitor, inductor, or
the two in combination. Filters made of capacitors (sometimes in

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combination with inductors) are normally added to the output of
the converter to reduce output voltage ripple.
Proposed system:
This paper proposes an input-parallel output-series boost
converter with dual coupled inductors for high step up and high
power applications. This configuration inherits the merits of
high voltage gain, low output voltage ripple, and low voltage
stress across the power switches. Moreover, the presented
converter is able to turn ON the active switches at zero current
and alleviate the reverse recovery problem of diodes by
reasonable leakage inductances of the coupled inductors.

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Block diagram:
BUFFER
circuit
5VDC
PIC controller
circuit
OPTO coupler
circuit
12 V
DC
INPUT
DC supply
LoadInterleaved boost
converter with
transformer
Voltage
multiplier
module

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Advantages:
 It can achieve a much higher voltage gain and avoid
operating at extreme duty cycle and numerous turn ratios.
 The voltage stresses of the main switches are very low,
which are one fourth of the output voltage under N = 1.
 The input current can be automatically shared by each
phase and low ripple currents are obtained at input.
 The main switches can be turned ON at ZCS so that the
main switching losses are reduced.
 The current falling rates of the diodes are controlled by the
leakage inductance so that the diode reverse-recovery
problem is alleviated.
Applications:
 Photovoltaic energy conversion systems
 fuel–cell systems
 lamp ballasts for automobile headlamps
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.

A high gain input parallel output-series dcdc converter with dual coupled inductors

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