Inductor devices – Core surrounding linear conductor
Patent
1996-01-24
1998-03-10
Wong, Peter S.
Inductor devices
Core surrounding linear conductor
H01F 230
Patent
active
057266182
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The arrangement relates to controlling the power flow using transductors, in particular in switched mode power supplies.
PRIOR ART
Switched mode power supplies are used to a large extent for tasks in which large output currents are needed at low voltages, for example in power supply units for high-power computers. Here, a plurality of voltages are generally needed on the secondary side. For this purpose, a plurality of output windings are used which are rectified separately. In this arrangement, regulation on the primary side cannot balance out load differences on the various output voltages, with the result that an additional secondary regulation is necessary. For this purpose, the use of transductors, that is to say of coils controlled into magnetic saturation, has proven worthwhile.
SUMMARY OF THE INVENTION
It is the object of the invention to provide arrangements which at low cost, achieve transductors for currents up to 300 A in the low voltage range with a low stray inductance and easy manufacture.
The invention uses one-piece cores of rectangular shape, through which the primary winding to be controlled is guided as a copper section having one turn. In this case, the use of one-piece cores, which are known in toroidal form as ring cores, is particularly advantageous, because a high permeability is achieved as a result of the omission of an air gap. The necessary cross section in the case of cuboidal cores can be achieved in a simple manner by lining up a plurality of cores.
As a result of the rectangular cross section, in conjunction with a rectangular conductor for the primary coil, almost complete filling of the interior space is achieved. The use of a flat section for the primary coil which is guided back outside the core at a small separation from the inner part is particularly advantageous. As a result a particularly low residual or stray inductance is achieved. The control winding, in contrast to a conventional ring core, can be wound in layers.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in the several Figures of which like reference numerals identify like elements, and in which:
FIG. 1 shows a section through a core having a controlled winding and a controlling winding,
FIG. 2 shows a cross section through a plurality of cores having windings and
FIG. 3 shows an application circuit in a primary-clocked power supply unit.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a section through a one-piece core 10 made of highly permeable material having low eddy current losses, for example a ferrite. This core has the shape of a cube which has a cuboidal passage 12 and thus has a closed iron path having two legs 14a, 14b and yokes 15a, 15b connecting them. A primary winding 11a, 11b is laid around one leg 14a and a control winding 13 is fitted on the other leg 14b. The primary winding comprises a metallic section which is as broad as the passage in the core and whose cross section is preferably about half the cross section of the passage. The control winding 13 comprises one or more layers of insulated wire.
In FIG. 2, this arrangement is shown in cross section. In this case the preferred embodiment is shown, in which the primary winding 11a, 11b is a flat section made of copper or aluminum and bent or coiled into a U-shape, over which during assembly a prepared core set, already provided with the control winding, is pushed. After this, the flat section is screwed directly to the rectifier connections (not shown) and the control winding 13 is connected. The core set is previously manufactured from one or more cores which are lined up in a row, so that their openings align. After a temporary fixing, for example by means of adhesive tape, the control winding can be
REFERENCES:
patent: 3916286 (1975-10-01), Waehner
patent: 4700166 (1987-10-01), Bradt et al.
AEG Handbook, vol. 1, No. 2, Berlin, 1976, pp. 188 and 395.
Patel Rajnikant B.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
Wong Peter S.
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