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access icon free Parallel-connected buck converters controlled by capacitor current feedback based PT with current-sharing ability

© The Institution of Engineering and Technology
Received 29/11/2017, Accepted 06/09/2018, Revised 28/06/2018, Published 05/10/2018

Parallel-connected power converters have been widely used in the application scenarios required high power to deal with the high load current. In this study, the pulse train (PT) controller with the advantages of fast response speed and simple structure is newly applied to the parallel-connected buck converters with current-sharing ability. However, as the converters operated in continuous conduction mode, undesirable low-frequency voltage oscillation will be brought about by the PT control method. To resolve this problem, a novel capacitor-current-feedback-based PT (CCF-PT) control method is proposed to eliminate the low-frequency oscillation of the parallel-connected buck converters. The approximate discrete time model of the CCF-PT-controlled buck converters is established, and the bifurcation diagrams of output voltage and inductor current changing along with the current scale factor, the capacitor-current-feedback coefficient and the load resistance are drawn to show the operation stability of the converters. Simulation and experimental results are obtained, which indicate that the proposed parallel-connected buck converters with CCF-PT control have excellent performance such as fast response, wide load range and effective suppression of low-frequency oscillation.

Inspec keywords: bifurcation; inductors; power convertors; feedback; circuit stability; sampled data systems; voltage control; discrete time systems; capacitors; electric current control

Other keywords: inductor current; capacitor-current-feedback-based pulse train control method; current scale factor; load resistance; approximate discrete time model; low-frequency voltage oscillation; CCF-PT-controlled buck converters; high load current; output voltage bifurcation diagrams; fast response speed; parallel-connected buck converters; pulse train controller; capacitor-current-feedback-based PT; parallel-connected power converters; current-sharing ability; continuous conduction mode; capacitor-current-feedback coefficient

Subjects: Power convertors and power supplies to apparatus; Control of electric power systems; Voltage control; Discrete control systems; Power electronics, supply and supervisory circuits; Current control

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