4.8 Article

Hybrid Control Strategy for an Integrated DAB-LLC-DCX DC-DC Converter to Achieve Full-Power-Range Zero-Voltage Switching

期刊

IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 12, 页码 14383-14397

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3086633

关键词

Zero voltage switching; MOSFET; Voltage control; Rectifiers; Zero current switching; DC-DC power converters; Magnetics; Extended phase shift (EPS); integrated dual active bridge (DAB)-LLC-DCX dc-dc converter; light load efficiency improvement; variable gain LLC converter; zero-voltage switching (ZVS)

资金

  1. National Key Research and Development Program of China [2018YFB0904100]
  2. Science and Technology Project of State Grid [SGHB0000KXJS1800685]

向作者/读者索取更多资源

This article proposes a dual active bridge (DAB)-LLC-DCX dc-dc converter with integrated magnetics and shared rectifier for point of load applications, achieving tight voltage regulation, zero-voltage switching for all switches, and zero-current switching operation for the rectifier. A hybrid control strategy is introduced to achieve ZVS operation for all switches within full power range. Experimental results of an 80-W prototype validate the theoretical analysis.
In this article, a dual active bridge (DAB)-LLC-DCX dc-dc converter with integrated magnetics and shared rectifier is proposed for point of load applications, which is able to achieve tight voltage regulation, zero-voltage switching (ZVS) operation for all switches and zero-current switching operation for rectifier. The challenge of the proposed converter is the realization of ZVS operation for all the switches within full power range to achieve high efficiency and high reliability, which is beneficial for light load efficiency improvement of microprocessors. Therefore, with different input voltage range, a hybrid control strategy is proposed to realize ZVS operation for all switches of the proposed converter within full power range in this article. When at high input voltage, extended phase shift control is applied to extend the ZVS range. When at low input voltage, variable gain LLC converter is designed to regulate the voltage distribution among DAB converter and LLC converter for the ZVS operation of DAB converter. Besides, the charging/discharging of junction capacitors are added into consideration of ZVS analysis. The operating principle, design considerations, and control schemes are presented. Finally, the experimental results of an 80-W prototype verified the theoretical analysis.

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