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Analysis of Dual-Carrier Modulator for Bidirectional
Non inverting Buck–Boost Converter
ABSTRACT
A pulse-width modulation modulator for a non inverting bidirectional buck–boost converter is
analyzed and a corresponding average-mode current controller design is revealed. The main
feature of the modulator is the ability to create switching sequences for both converter legs
without requiring any information regarding either operation mode or the direction of power
flow. The modulator receives a control signal generated by the current controller, and a
triangular carrier and generates driving signals with two different duty cycles, allowing tight
control of the inductor current throughout the entire operating range.
CIRCUIT DIAGRAM
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Existing System
Bidirectional converters are generally divided into isolated and nonisolated types. In the case
where galvanic isolation is not required, a noninverting buck–boost converter is probably the
most versatile topology, supporting BUCK, BOOST, and BUCK–BOOST operations.
The synchronous version of the converter allows bidirectional power flow. When a bidirectional
noninverting buck–boost (BDNIBB) converter is voltage mode controlled(utilizing either hard or
soft switching, the controller and modulator must be carefully designed to treat inherent
nonlinearities and non smooth transients of mode transitions, which occur if the BUCK–BOOST
operation is skipped to improve efficiency.
Proposed System:
In this project, the modulator is generalized and extended to the average currentcontrolled bidirectional BDNIBB converter. Comprehensive analysis of the modulator operation
is carried out and current controller based on the proposed modulator is designed.
It is shown that when the propose modulator is adopted, the control-to-output transfer-function
gain of the current loop remains unchanged upon mode transitions and the corresponding plants
differ only in terms of disturbance.
TOOLS AND SOFTWARE USED:
 MP LAB
 ORCAD/PSPICE
 MATLAB/SIMULINK
OUTPUT:
 HARDWARE
 SIMULATION