NDLI: Small-Signal and Large-Signal Analysis of the Two-Transformer Asymmetrical Half-Bridge Converter Operating in Continuous Conduction Mode

Content Provider	IEEE Xplore Digital Library
Author	Arias, M. Fernandez Diaz, M. Gonzalez Lamar, D. Fernandez Linera, F.M. Sebastian, J.
Copyright Year	1986
Abstract	The asymmetrical half-bridge converter (AHBC) has many advantages over other PWM converters. The possibility of soft switching in primary switches and reduced switching losses in the secondary ones implies that the AHBC is a suitable topology for many high-performance applications. Besides, the lack of dead times, except those needed for achieving soft switching, is a very interesting feature to implement self-driven synchronous rectification. Moreover, the small size of its output filter is also a remarkable advantage in some fields (e.g., LED lighting). On the other hand, it also has some disadvantages. One of them is the short range of the duty cycle (lower than 0.5) and the other one is the difficult regulation due to a complex transfer function. The two-transformer AHBC (TTAHBC) solves the first problem as it enlarges the duty cycle range making its top limit higher than 0.5. Nevertheless, the regulation of this converter is still very complex and, besides, the transfer functions of the standard AHBC are not valid for the TTAHBC. As a consequence, the small- and large-signal models have yet to be studied. In this paper, the complete small-signal and large-signal analysis of the TTAHBC operating in continuous conduction mode is provided. The large-signal and small-signal models are developed taking into account the main parasitic components that affect the transient response of this converter. The validation of the resulting model is carried out by means of both, simulation and experimental results. The prototype is a 60-W TTAHBC designed for an input voltage of 400 V and an output voltage of 48 V.
Sponsorship	IEEE Power Electronics Society
Starting Page	3547
Ending Page	3562
Page Count	16
File Size	1823513
File Format	PDF
ISSN	08858993
Volume Number	29
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transfer functions Equations Voltage control Capacitors Topology MOSFET Mathematical model small signal Asymmetrical half bridge half bridge with complementary control large signal
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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