NDLI: Mixed-Signal-Controlled Flyback-Transformer-Based Buck Converter With Improved Dynamic Performance and Transient Energy Recycling

Content Provider	IEEE Xplore Digital Library
Author	Jing Wang Prodić, A. Wai Tung Ng
Copyright Year	1986
Abstract	This paper introduces a practical modification of the buck converter and a complementary controller that are well suited for point of load applications with highly dynamic loads. The presented flyback-transformer-based buck (FTBB) converter has faster transient response than the conventional buck, allowing for a reduction in the output capacitance without penalty in the size of the magnetic core. During heavy-to-light load transients, the FTBB converter also recycles excess energy stored in the magnetic component, providing a useful energy savings mechanism. In this modification, the conventional buck inductor is replaced with the primary winding of the flyback transformer, an extra switch, and a set of small auxiliary switches on the secondary side. During heavy-to-light load transients, the inductor current is steered away from the output capacitor to the input port, achieving both energy recycling and savings due to reduced voltage overshoots. The light-to-heavy transient response is improved by reducing the equivalent inductance of the primary transformer winding to its leakage value. A mixed-signal current-programmed mode controller regulates operation of the converter. The controller provides minimum output voltage deviation and ensures seamless transitions between different operating modes. The performance of the FTBB converter is verified with a 6-to-1-V, 3-W, 390-kHz experimental prototype. In comparison with an equivalent buck converter, the experimental system has about three times smaller maximum output voltage deviation, allowing for the same output capacitor reduction and, for frequently changing loads, about 7% decrease in power losses.
Sponsorship	IEEE Power Electronics Society
Starting Page	970
Ending Page	984
Page Count	15
File Size	1717327
File Format	PDF
ISSN	08858993
Volume Number	28
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transient analysis Inductance Switches Inductors Capacitors Windings Transistors transient response DC-DC power converters digital control energy efficiency flyback transformers switched-mode power supply
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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