The Impact of Parasitic Elements on Spurious Turn-On in Phase-Shifted Full-Bridge Converters

- Journal title : Journal of Power Electronics
- Volume 16, Issue 3, 2016, pp.883-893
- Publisher : The Korean Institute of Power Electronics
- DOI : 10.6113/JPE.2016.16.3.883

Title & Authors

The Impact of Parasitic Elements on Spurious Turn-On in Phase-Shifted Full-Bridge Converters

Wang, Qing;

Wang, Qing;

Abstract

This paper presents a comprehensive analysis of the spurious turn-on phenomena in phase-shifted full-bridge (PSFB) converters. The conventional analysis of the spurious turn-on phenomenon does not establish in the PSFB converter as realizing zero voltage switching (ZVS). Firstly, a circuit model is proposed taking into account the parasitic capacitors and inductors of the transistors, as well as the parasitic elements of the power circuit loop. Second, an exhaustive investigation into the impact of all these parasitic elements on the spurious turn-on is conducted. It has been found that the spurious turn-on phenomenon is mainly attributed to the parasitic inductors of the power circuit loop, while the parasitic inductors of the transistors have a weak impact on this phenomenon. In addition, the operation principle of the PSFB converter makes the leading and lagging legs have distinguished differences with respect to the spurious turn-on problems. Design guidelines are given based on the theoretical analysis. Finally, detailed simulation and experimental results obtained with a 1.5 kW PSFB converter are given to validate proposed analysis.

Keywords

Crosstalk;Leading and lagging legs;Parasitic inductor;Spurious turn-on;

Language

English

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