Self‐oscillating isolated‐buck (fly‐buck) converter

The Journal of Engineering

Denys Igorovych Zaikin¹ 

[1] R&D System Control Serenergy A/S Lyngvej 8 Aalborg 9000 Denmark;

关键词: Power electronics, supply and supervisory circuits;    Transformers and reactors;    Power convertors and power supplies to apparatus;    Control of electric power systems;   

DOI  :  10.1049/tje2.12060

来源: DOAJ

【 摘 要 】

Abstract This study presents a self‐oscillating fly‐buck converter. The primary objective of this research is to lower the final bill of materials cost of a fly‐buck converter. The fly‐buck converter is based on a relaxation self‐oscillation circuit. The main transformer is updated with two additional auxiliary windings for positive feedback implementation. The turn ratios of these windings are estimated, and criteria for a stable oscillation mode are developed. A switching frequency formula is also provided. Furthermore, an example start‐up circuit is proposed and calculated. Output voltage stabilisation is implemented and demonstrated to work with ±10% variations in input voltage. The experimental data and design procedure are presented along with a comparison of the proposed fly‐buck converter against conventional fly‐buck converters. The converter is optimised for maximum efficiency, with an efficiency of >85% demonstrated at 20 W output power. The proposed self‐oscillating circuit can also be implemented in a conventional synchronous buck converter. The Maxima software code for automated calculation of the converter is supplied as supplemental active media content.

【 授权许可】

Unknown