Topic
Isolation transformer
About: Isolation transformer is a research topic. Over the lifetime, 8145 publications have been published within this topic receiving 72396 citations.
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Patent•
12 Aug 1988TL;DR: In this article, a push-pull transformer of a current-fed DC-DC converter is arranged so that the inductance of the primary side of the transformer diminishes equivalently, thereby reducing a conversion loss attributable to a distributed capacitance.
Abstract: A push-pull transformer of a push-pull current-fed DC-DC converter is arranged so that the inductance of the primary side of the transformer diminishes equivalently, thereby reducing a conversion loss attributable to a distributed capacitance of the transformer. To equivalently reduce the inductance of the primary side, for instance, a gap is formed in the core of the transformer and/or an inductor is connected in parallel to any one of the windings of the transformer.
28 citations
TL;DR: In this article, the authors investigated circuit model, design feasibility, and design tradeoffs for the transformer in 1.5-5 V power supplies with high efficiency and high power density, and determined theoretically and verified experimentally that such a transformer is realizable as long as the loss constraint is not severe.
Abstract: Circuit model, design feasibility, and design tradeoffs are investigated for the transformer in 1.5-5 V power supplies with high efficiency and high power density. The transformer is constructed from a single or a matrix of pot cores and from interleaved planar windings. It has been determined theoretically and verified experimentally that such a transformer is realizable as long as the loss constraint is not severe (e.g. less than 0.5 W transformer loss per 100 W output). The primary source of loss is the winding, not the core, in 1.5 V/turn design. Measures to reduce the transformer height tend to increase transformer loss or volume. >
28 citations
12 Nov 2012
TL;DR: In this article, a novel predictive algorithm has been proposed for bi-directional dc-dc converters with high frequency transformer isolation, which can remove dc bias in the isolation transformer within several switching cycles hence preventing transformer saturation.
Abstract: In this paper a novel predictive algorithm has been proposed for bi-directional dc-dc converters with high frequency transformer isolation. The converter is a dual active bridge converter. The proposed algorithm is a faster alternative to the classical PI based phase shift controller. This mode of control can remove dc bias in the isolation transformer within several switching cycles hence preventing transformer saturation. Aspects of the proposed algorithm have been implemented on a hardware test bed and verified.
28 citations
Patent•
27 Aug 2001
TL;DR: In this paper, a forward DC/DC converter using semi-synchronous MOSFET rectifiers with a peak detector and a pulse transformer is presented, where the gate driving signal is derived from the secondary of the input power transformer.
Abstract: A forward DC/DC converter using semi-synchronous MOSFET rectifiers with a peak detector and a pulse transformer. In another example edge triggered circuits and active clamps are used. The gate driving signal for one MOSFET is derived from the secondary of the input power transformer, but the second MOSFET gate is driven from a combination of the secondary of the input power transformer and the pulse transformer. The second MOSFET remains on during the core reset and dead time periods thereby providing a low voltage current path for the load current.
28 citations
15 Mar 2015
TL;DR: In this paper, the authors examined the use of a dual bridge inverter topology for an induction machine drive application, where the charging and discharging of the floating capacitor was controlled using redundant switching states.
Abstract: This paper examines the use of a dual bridge inverter topology for an induction machine drive application. The paper considers the possibility of using a dual bridge inverter with one bridge floating to generate multilevel output voltage waveforms. The charging and discharging of the floating capacitor will be controlled using redundant switching states. The use of this topology can improve system efficiency and converter volume. The paper includes analysis and modulation of the converter topology as well as simulation and practical results showing the converter operation.
28 citations