JPS609109A - transformer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (a) Technical field of the invention The present invention relates to a transformer whose secondary side has a low voltage and a large current.

(b) Background of the technology Power transformers for communication equipment, electronic equipment, etc. have low voltage and high current on the secondary side, and the tolerance range is particularly narrow.
Next-side voltage is often required.

(C) Prior art and problems Figure 1 is a side sectional view of a conventional transformer, showing the primary winding 1.
The secondary winding 2 is formed by winding a thin conducting wire in multiple layers around the body of a flanged bobbin 3, and the secondary winding 2 is formed by winding a thick conducting wire a small number of times around the body of a flanged bobbin 4. The axial center cavity of the bobbin 3 is fitted into one of the opposing columnar parts of the frame-shaped iron core 50, and the axial center hollow part of the bobbin 4 is fitted into the other columnar part, thereby forming a transformer. has been done.

The transformation ratio of such a transformer is inversely proportional to the number of turns of the primary winding 1 and the secondary winding 2, so in order to obtain a secondary voltage with a narrow tolerance range for a constant primary voltage, it is necessary to If the number of turns of the secondary winding 2 is small, the 11 turns of the secondary winding 2 will greatly affect the secondary voltage. Therefore, there is no other way than to increase the number of turns of each of the primary winding 1 and the secondary winding 2 and adjust the ratio of the number of turns.

On the other hand, the secondary winding 2 requires a conductor with a large cross-sectional area in accordance with the desired large current, which not only makes it difficult to wind the secondary winding 2 many times, but also increases the size of the transformer. There is a point.

(d.) OBJECTS OF THE INVENTION An object of the present invention is to provide a transformer in which the above-mentioned conventional problems are eliminated.

(e) Structure of the Invention In order to achieve this object, the present invention provides a spiral structure in which one ash winding passes through an axial cavity and is wound around a rod-shaped primary winding, or a rod-shaped primary winding in which a primary winding winds around the outer periphery. Il that is wound through the iron core and the secondary winding of the axial center cavity part number! l! ! It is equipped with a spiral secondary iron core, and each end of the primary iron core and the secondary iron core are connected to form a closed magnetic path, and the number of windings of the secondary winding can be increased. It has been reduced.

(f) Embodiments of the Invention The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 2 is a side view of an embodiment of the invention.

In the figure, a primary winding 6 is constructed by winding thin conductive wire in multiple layers around the body of a flanged hollow bobbin 8. For example, a rod-shaped primary made of ferrite.

The side core 10 passes through the axial center cavity of the bobbin 8 and is magnetically coupled to and attached to the primary winding 6.

For example, the secondary iron core 11 made of ferrite and formed in a spiral shape is configured to have sufficient air gaps between the respective spiral ring members to prevent leakage of magnetic flux. The secondary winding 7 is made of a thick conductor bar, and is passed through the axial center cavity of the secondary 11 iron core 11 once or several times (twice in the figure).
It is wrapped.

The terminal of the secondary iron core 11 is extended above the primary iron core IO,
It is fixedly connected to the lower end surface with, for example, adhesive. Therefore, the primary iron core IO and the secondary iron core 11 constitute an iron core 9 in which a closed magnetic path is formed.

In this way, a transformer with a helical core changes the primary voltage to E
l, the secondary voltage is E2, the number of turns of the primary winding is N1.2 the number of turns of the gray winding is N2. the number of helices in the primary iron core is 01. the number of helices in the secondary iron is 02, then the metamorphic ratio is has the following relationship.

El /E2 =N2 /NI

Therefore, the degree of freedom in the transformation ratio is primary winding and secondary winding.

There are four primary iron cores and four secondary iron cores, and the number of turns of the secondary winding 7 is very small (even if the number of turns of the secondary winding 7 is reduced to
By supplementing with the wI delivery number, it is possible to obtain a secondary voltage of a desired value with a narrow tolerance range for a constant primary voltage.

In this way, the number of secondary windings 7 can be extremely reduced. It is also possible to do so. Therefore, the secondary winding 7 has a large cross-sectional area.
The winding process becomes easy.

Note that the present invention is not limited to the illustrated embodiment; for example, the iron core may be made of magnetic soft iron instead of ferrite, or the spiral iron core may be filled with an electrical insulator to stabilize leakage magnetic flux. It is possible to make appropriate modifications within the scope of the claims, such as making the primary iron core spiral.

(g) Detailed Description of the Invention As described above, the present invention has an iron core of 1 lO1! Due to the spiral shape, the tolerance range is narrow for a constant primary voltage.
It has excellent practical effects, such as being able to obtain a secondary voltage, being easy to process because the number of turns of the double-gray wire is extremely small, and being relatively compact even when the secondary current is large.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a conventional transformer, and FIG. 2 is a side view of an embodiment of the present invention. In the figure, 1.6 is the primary winding, 2,7 is the 2nd gray winding, 3 and 4.8
is the bobbin, 5 and 9 are the iron core, 1o is the primary side iron core, 11 is the 2
The following iron cores are shown respectively.

Claims (1)

[Claims] The primary winding core has a spiral shape in which the primary winding passes through the axial center cavity, or a rod-shaped primary core in which the primary winding winds around the outer periphery, and a secondary winding passes through the axial center cavity and is wound. What is claimed is: 1. A transformer comprising: a rotating helical secondary core; each end of the primary core and the secondary core are connected to form a closed magnetic path.