NDLI: Zeroing transformer's DC current in resonant converters with no series capacitors

Content Provider	IEEE Xplore Digital Library
Author	Gertsman, A. Ben-Yaakov, S.
Copyright Year	2010
Description	Author affiliation: Power Electronics Laboratory, Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, ISRAEL (Gertsman, A.; Ben-Yaakov, S.)
Abstract	DC current unbalance in the windings of a transformer may initiate a runaway process and ultimately drive the transformer into saturation. Such a situation could arise in a transformer coupled resonant converter that does not include a series capacitor. This issue was explored in this study theoretically, by simulation and experimentally. A method is proposed for automatically adjusting the transformer's DC current to zero by correcting the asymmetry of the drive. This balancing control is facilitated by a signal obtained from a DC/AC current sensor which senses the transformer's primary and secondary currents such that they cancel each other for the no DC case. The proposed method was tested on a self oscillating, parallel loaded DC-DC resonant converter of 12V input voltage 500V output voltage and 700W power level. The proposed approach allows the design of resonant converters without DC decoupling capacitors which could lead to a significant cost and size reduction.
Starting Page	4028
Ending Page	4034
File Size	688109
Page Count	7
File Format	PDF
ISBN	9781424452866
DOI	10.1109/ECCE.2010.5618289
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital control Inductance Resonant power conversion Magnetization current Magnetization Capacitors Bridge circuits Converters Capacitance Circuit faults Transformer saturation
Content Type	Text
Resource Type	Article

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