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INVENTION
Patent of the Russian Federation RU2074432
MATRIX TRANSFORMER
The applicant's name: Vasily Arsenievich Khabuzov; Khudyakov Vladimir Fedorovich
The name of the inventor: Vasily Arsenievich Khabuzov; Khudyakov Vladimir Fedorovich
The name of the patent holder: Khabuzov Vasily Arsenievich; Khudyakov Vladimir Fedorovich
Address for correspondence:
Date of commencement of the patent: 1994.09.20
Usage: in electrical engineering and, in particular, in high-frequency transformers (inductive cells) and can be used in radio electronics and converter technology, for example in secondary power supplies.
SUMMARY OF THE INVENTION: The device consists of several identical sections containing an open core magnetic core with primary and secondary windings coaxially located on its surface, the connections of the terminals of the same windings at the sections and groups combining one or more sections are made in the form of combinations of consecutive and parallel Circuits, and between the sections there is an adjustable magnetic coupling. The matrix transformer has a wider field of application due to the possibility of adjusting the transformation coefficient, the inductance of the magnetizing circuit and the winding capacity, which is achieved by switching the windings and changing the magnetic coupling between the sections with the same parameters of the cores and windings.
DESCRIPTION OF THE INVENTION
The device relates to electrical engineering and, in particular, to high-frequency transformers and other inductive elements and can be used in radio electronics and converter technology, for example in secondary power supplies.
A flat matrix-type transformer [1] is known from several identical sections in the form of toroidal cores with single-turn primary and secondary windings, the windings of the same name being connected in parallel.
The disadvantage of such a transformer is a limited field of application, due to the inability to control parameters such as the inductance of the magnetizing circuit, the winding capacity.
A multi-section transformer [2] is known which is selected as a prototype. This transformer comprises primary winding sections disposed on separate toroidal magnetic cores arranged on cylindrical metal rods forming a secondary winding in the form of parallel-connected single-turn core sections, all primary winding sections being connected in parallel.
The main disadvantage of the prototype transformer is a limited field of application due to the inability to regulate the inductance of the magnetizing circuit and the winding capacity without changing the core design and the number of turns of the windings.
The purpose of the invention is to expand the scope of the transformer by adjusting the parameters.
The technical result is achieved in that in a known matrix (multisectional) transformer comprising several identical sections with a separate magnetic core each, primary winding sections with leads, a secondary winding with leads, a separate magnetic circuit is made in the form of an open rod magnetic core, a secondary winding in the form of sections, Each of these sections being located on a separate magnetic circuit in conjunction with the primary winding section, the primary and secondary winding sections are combined into groups connected in series, and the sections in the groups are in series-parallel.
The proposed set of essential features of a matrix (multisectional) design of an open-core transformer in each section, the combination of sections into groups with a series-parallel connection of sections and groups of windings makes it possible to obtain the desired technical result consisting in expanding the field of application by adjusting the parameters. Indeed, in the matrix transformer, it is possible to vary the inductance of the magnetizing circuit and the interwinding capacitance by adjusting the magnetic coupling between the transformer sections with the open cores by moving these sections in space with respect to each other. In this case, the transformer can reduce the no-load current with increasing inductance of the magnetizing circuit, increase the amplitude of the magnetizing current by decreasing this inductance in the case of using the proposed device as a transformer-choke of the electromagnetic energy storage device, and also apply the proposed device as an inductive-capacitive element for the resonant circuit with Controlled by natural frequency. Thus, the field of application of the matrix transformer is expanding, and such a transformer has a planar (flat) design with increased levels of unification and manufacturability.
FIG. 1 shows one section of the transformer
2 two of a series of possible circuit diagrams for connecting the terminals of sections and groups of windings: in series for the primary winding and in parallel (a) and in series (b) for sections in the secondary winding group.
In Fig. 1 and 2 , the following symbols are introduced: 1 section of the transformer, 2 open core of the transformer section, 3 section of the primary winding, 4 section of the secondary winding, 5 group uniting the winding sections, 6 - insulating spacer between the winding sections.
The proposed matrix transformer comprises several identical sections 1 ( FIG. 1 or FIG. 2 1.1.1.4 ) with a separate magnetic core each made in the form of an open rod magnetic core 2 (2.1-2.4). On the surface of the core 2, for example, coaxial section of primary 3 and section of secondary 4 windings (3.1-3.4 and 4.1-4.4) are located. Sections 3 and 4 are grouped into groups 5. Between the winding sections 3 and 4 there is an insulating spacer 6. The leads of the primary winding sections 3.1-3.4 are connected in series and in groups according to ( Fig. 2, a ) or counter ( Fig. 2b ). In the secondary winding, the groups 5.1 and 5.2 are connected in parallel ( Fig. 2a ) or sequentially (Fig. 2b). Other variants of connection of sections and groups of windings 3 and 4 are possible, and in group there can be one or several sections of windings 3 and 4 at any number of groups.
In general, the work of a matrix transformer is the same as for a conventional transformer. Features of the work are as follows. The magnetic flux caused by the current flow in the primary winding 3 passes along the longitudinal axis of the open core 2 of the transformer section 1 and is closed in the surrounding space. At the same time, part of the magnetic flux of section 1.1 penetrates the windings of the windings of section 1.2 and other sections as it passes through the surrounding space. From the theory of magnetically coupled circuits, it is known that the total inductance of two series-connected coils connected through a magnetic field is defined as L 1,2 L 1 + L 2 ± 2M , where M is the mutual inductance, which depends on the distance between the coils and on the angle of rotation with respect to The friend of a friend of their longitudinal axes. The "+" sign takes place with the consonant, and the "-" sign when the coils are turned on. Consequently, the value of the inductance of the magnetizing circuit of group 5.1 can be larger than the sum of the inductance values of the winding sections 3.1 and 3.2 with consonant inclusion and may be smaller in the opposite case. With the parallel connection of the winding sections, the total inductance is defined as the inductance of the parallel circuit, taking into account the mutual inductance. In all cases with different connection schemes of sections and groups of windings, their mutual inductance is reduced by the separation of sections of the transformer in space and increases by convergence, and is regulated by turning their longitudinal axes at an angle to each other. At the same time, the total value of the interwinding capacity changes, and the nature of these changes is similar to the nature of the inductance. Consequently, in the matrix transformer, the inductance of the magnetizing circuit and the interwinding capacitance can be controlled by mutual movement of the transformer sections in space (by separation and approach), by rotating their longitudinal axes at different angles to each other, with consonant and counter-coupling of the winding sections and different versions of connecting the terminals of sections and groups .
Thus, the technical result in the proposed matrix transformer expansion of the application area is achieved as follows. In the proposed matrix transformer, the design of the magnetic circuit of each section is changed, consisting in the use of an open rod magnetic core, which ensures the presence of an adjustable magnetic coupling between the sections, which makes it possible to change the inductance of the magnetizing circuit and the winding capacity at constant parameters of the windings and cores. Adjustment of the indicated inductance and capacity allows:
- Reduce the no-load current of the transformer;
- Increase, if necessary, the amplitude of the magnetizing current in the transformer-throttle used as a store of electromagnetic energy;
- Change the natural frequency of the transformer used as an inductive capacitive element for resonant circuits.
These capabilities expand the scope of the matrix transformer, and in addition, it has a planar design with increased levels of unification and manufacturability.
For verification, a two-section matrix transformer with open rod ferrite cores (length 45, diameter 4 mm) and a coaxial arrangement of the winding sections was fabricated. In the inductance sections of the primary winding 630 and 667 μH , secondary 135 and 133 μH , interwinding capacitances 73 and 80 pF . During the adjustment, the limits of the change were equal: the inductance of the primary winding from two sections from 2390 to 920 μH , the inductance of the secondary winding from 127 to 50 μH and the interwinding capacitance from 224 to 137 pF . The results of testing the operation of the transformer under various operating conditions are positive.
CLAIM
A matrix transformer comprising several identical sections with a separate magnetic core each, primary winding sections with leads, a secondary winding with leads, characterized in that the individual magnetic circuit is in the form of an open rod magnetic core, a secondary winding in the form of sections, each of these sections being located on A separate magnetic circuit together with the primary winding section, the sections of the primary and secondary windings are grouped together in series, and the sections in the groups are in series in parallel.
print version
Date of publication 12.11.2006гг
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