Analysis of dual carrier modulator for bidirectional
Analysis of Dual-Carrier Modulator for Bidirectional Non
inverting Buck–Boost Converter
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.
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
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
In this project, the modulator is generalized and extended to the average
current-controlled 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:
Ilan Aharon, Student Member, IEEE, Alon Kuperman, Member, IEEE, and Doron
Shmilovitz, Senior Member, IEEE, “Analysis of Dual-Carrier Modulator for
Bidirectional Noninverting Buck–Boost Converter”, IEEE TRANSACTIONS
ON POWER ELECTRONICS, VOL. 30, NO. 2, FEBRUARY 2015.