Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-10-23
1997-09-30
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 20, H02M 300
Patent
active
056731833
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to DC/DC converters and, more particularly, to a DC/DC converter having a transformer for providing low output voltages and high currents.
2. History of the Related Art
Voltage regulators, both those that work according to the forward-current converter principle as well as those that work according to the fly-back converter principle, have become very well known in the last several years, for example, from O. Kilgenstein, Schaltnetzteile in der Praxis, Wuerzburg, 1992, to mention one good overview. It is also true that in the last several years the components used in these devices have also been continuously improved, so that it has become possible to increase the working frequencies from several kiloherz in the beginning, to nearly 500 kHz today. Along with that, however, the total number of transformer windings in such switching regulators also decreases as well. In addition to that, increasingly lower output voltages are needed today. Along with the 5 volts that used to be common, output voltages of around 3 volts are now starting to appear, or even 2 volts. Since in the dimensioning of the transformers for 5-volt switching regulators, engineers are already getting down to a single secondary coil at times, voltages that are smaller yet, with currents that are often high, which can no longer be realized economically.
The present invention provides the creation of a direct current/direct current transformer for small output voltages and high currents, while regaining latitude for development despite the mentioned limitations, which result from the nature of the matter.
SUMMARY OF THE INVENTION
The present invention relates to a DC/DC converter with a primary section which chops the primary voltage, a transformer having a primary coil and at least one secondary coil, a secondary section that is supplied by the transformer and that has a storage choke and a storage capacitor that is charged to the secondary voltage.
More particularly, one aspect of the present invention relates to the DC/DC converter described above wherein the secondary coil of the transformer consists of several fractional winding segments through which current flows symmetrically.
In another aspect, the present invention relates to the DC/DC converter described above wherein the secondary coil of the transformer consists of n segments that are of the length of an integral fraction of one entire winding, each of which segments thus exhibits the length 1
of one entire winding, and n represents a small integer.
In another aspect, the present invention relates to the DC/DC converter described above wherein the transformer includes two secondary coils, each of which consists of a half-winding.
In another aspect, the present invention relates to the DC/DC converter described above wherein the secondary coil is divided into n sections whereby each section encompasses m
of a winding, the n sections are connected in parallel and m and n are small integers.
In another aspect, the present invention relates to the DC/DC converter described above wherein the length of one segment of the secondary coil is an improper fraction of one complete winding and thus exhibits the form m
.times.length, where m.gtoreq.n, and n number of such segments are present and m and n are small integers.
BRIEF DESCRIPTION OF THE DRAWINGS
Other advantages and features of the invention will become more apparent with reference to the following detailed description of a presently preferred embodiment thereof in connection with the accompanying drawings, wherein like reference numerals have been applied to like elements, in which:
FIG. 1 is a schematic diagram showing a known forward-current converter;
FIG. 2 is a sectional view of a known transformer pot core;
FIG. 3 is a top view of a pot core;
FIG. 4 is a top view of a so-called X-core;
FIG. 5 is a top view of a first embodiment of a transformer in accordance with the present invention;
FIG. 6 is a schematic diagram showing a forw
REFERENCES:
patent: 4991075 (1991-02-01), Saitou et al.
patent: 5086381 (1992-02-01), Kameyama et al.
patent: 5208738 (1993-05-01), Jain
patent: 5327334 (1994-07-01), Makino et al.
Milavec Johann
Springett Nigel
Melcher AG
Nguyen Matthew V.
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