Capacitor Voltage Regulation and Pre-Charge Routine for a Flying Capacitor Active Rectifier


In this paper, a research is carried out on a single-phase flying capacitor active rectifier. In order to regulate the voltage of the flying capacitors, a method based on redundant state selection is developed that generates an offline switching table. In addition, an online process is introduced that, by using the offline table, reduces the total number of switching events in the converter which leads to a reduction of switching losses. This method can be used for a flying capacitor converter with any number of levels. Furthermore, in order to control the inrush current during the start-up procedure and avoid extra voltage and current stresses for active switches and capacitors, a pre-charge routine for the flying capacitors is proposed. Experimental results demonstrate the benefits of the new concepts.

Meeting Name

4th Annual IEEE Energy Conversion Congress and Exposition (2012: Sep. 15-20, Raleigh, NC)


Electrical and Computer Engineering

Keywords and Phrases

Active Rectifiers; Active Switches; Current Stress; Flying Capacitor; Flying Capacitor Converter; In-Rush Current; Offline; On-Line Process; Pre-Charge; Start-Up Procedure; State Selection; Switching Loss; Switching Tables; Energy Conversion; Exhibitions; Voltage Regulators; Capacitors

International Standard Book Number (ISBN)

978-1467308038; 978-1467308021

International Standard Serial Number (ISSN)

2329-3721; 2329-3748

Document Type

Article - Conference proceedings

Document Version


File Type





© 2012 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2012