A Comparison of Digital PWM Control Strategies for High Power Interleaved DC-DC Converters

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Abstract

Abstract: Three PWM digital control approaches are evaluated to provide the current sharing between phases in highpower dual-interleaved DC-DC converters. The implementation of a digital peak current, multi-sample averaged current and an enhanced single-sample averaged current control in a TMS320F28377D is described. A summary of stability requirements is provided for designing the controllers and experimental results from a 60 kW, 75 kHz silicon carbide DC-DC converter are used to evaluate the steady-state and dynamic performance of the three control methods. Overall the best performance in terms of tracking and speed of response was achieved by the enhanced single-sample method. The multisampled technique provided the highest tracking accuracy, but at the expense of the slowest dynamic response. The fastest dynamic response was achieved by the digital peak current control, but this method is limited by poor noise immunity and instability for duty-ratios in the region of 0.5.

Bibliographical metadata

Original languageEnglish
JournalIET Power Electronics
Early online date30 Nov 2017
DOIs
Publication statusPublished - 8 Feb 2018

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