Title :
Fast Transitions Between Current Control Loops of the Coupled-Inductor Buck–Boost DC–DC Switching Converter
Author :
Restrepo, Carlos ; Konjedic, Tine ; Calvente, Javier ; Milanovic, Miro ; Giral, Roberto
Author_Institution :
Dept. d´Eng. Electron., Electr. i Autom., Univ. Rovira i Virgili, Tarragona, Spain
Abstract :
An already published current control strategy for the coupled-inductor buck-boost converter is able to change its aim from controlling the input current to controlling the output current, and vice versa, depending on the instantaneous operation point and the applied current references. The main drawback of the two PI-based control implementation is its slow response when the control aim is changed from one current to the other. Due to the magnetic coupling, the converter´s control-to-input and control-to-output current small signal transfer functions exhibit similar first-order characteristics. Therefore, it is possible to transform the previous control scheme to a PI-based one that exhibits faster and, in certain cases, much faster transitions between input and output current control operation. The presented experiments also show that the steady-state behavior of the converter is unaffected by the new control implementation.
Keywords :
DC-DC power convertors; PI control; electric current control; inductors; switching convertors; transfer functions; DC-DC converter; PI-based control implementation; buck-boost converter; coupled inductor; current control loop; current control strategy; magnetic coupling; signal transfer function; switching converter; Control systems; Current control; Fuel cells; Inductors; Power supplies; Steady-state; Voltage control; Average current-mode control; fast control response; input and output current control; noninverting buck–boost converter;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2231882