JPS6020899Y2 - Trance - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transformer, and particularly relates to a transformer that has bottom distortion and low loss characteristics.

Transformers, which are often used in power supplies of audio equipment, step up or step down AC input signals and output them, and are indispensable in equipment that handles AC signals.

This transformer has, for example, a transformer winding in which a primary coil and a secondary coil are wound, and this transformer winding is housed in a case so that only the terminals of the primary and secondary coils are exposed to the outside. It's being pulled out.

In this case, iron or aluminum is used as the case of the transformer.

However, if iron is used as a transformer case, it is excellent for obtaining mechanical strength, but since the case is a magnetic material, the signal current flowing through the transformer winding is distorted due to hysteresis characteristics.

On the other hand, in a transformer that uses a case made of aluminum, which is a non-magnetic material, the above-mentioned hysteresis problem is solved, but eddy current flows through the case due to leakage magnetic flux, and the transformer is not affected by this eddy current. This has the disadvantage that the current flowing through the transformer winding is distorted.

To solve this problem when using a metal case, you can either use the transformer winding alone without using a case, or use a case made of non-magnetic material such as resin. It is possible to use .

However, when used in such conditions, geomagnetic electromagnetic waves,
Another drawback is that the output current is distorted due to the influence of magnetic flux leaking from other devices.

Therefore, the purpose of this invention is not to be affected by external electromagnetic
Another object of the present invention is to provide a transformer with low distortion and low loss.

In order to achieve this objective, the present invention is characterized in that the case of the transformer is made of ceramic whose main material is silicon carbide.

The transformer according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view of the main parts of an embodiment of a transformer according to the present invention, and 1 is a case of the transformer having a U-shaped cross section. Constructed from quality ceramic.

A transformer winding 2 is housed in the case 1 and is wound in a toroidal manner.

The transformer winding 2 housed in the porous ceramic case 1 is hardened with a heat-resistant resin as necessary, and then sealed with a lid made of porous ceramic (not shown).

In the transformer configured in this manner, when an AC signal is supplied to an input terminal (not shown) drawn out through the case 1 made of porous ceramic, the voltage is increased or decreased in the transformer winding 2. A signal is sent to the output terminal.

In this case, since the ceramic whose main material is silicon carbide is excellent in absorbing electromagnetic waves, the transformer winding 2 housed inside is not affected by external electromagnetic waves.

By making this ceramic whose main material is silicon carbide porous, the absorption efficiency of external electromagnetic waves, that is, the conversion into heat, becomes better.

Further, since this ceramic mainly made of silicon carbide is non-magnetic and insulating, it can solve all problems caused by hysteresis and eddy current caused by leakage magnetic flux.

Therefore, by using a transformer configured in this manner in an audio device, low distortion and low loss can be achieved, and reproduced sound with a rich sound field can be easily obtained.

FIG. 2 is a sectional view of main parts showing another embodiment of the transformer according to the present invention, and the same parts as in FIG. 1 are designated by the same symbols and detailed explanation thereof is omitted.

In the figure, reference numeral 3 denotes a conductive resin case provided to cover the outer peripheral surface of the case 1 made of porous ceramics whose main material is silicon carbide.

In this case, the conductive resin case 3 is made of resin mixed with carbon, for example.

In this way, when the transformer winding 2 is housed doubly by the case 1 made of porous ceramic whose main material is silicon carbide and the conductive resin case 3, the conductive resin case 3
Since it is non-magnetic and conductive, it is less affected by external electric fields and electric field irregularities.

In the above-mentioned embodiment, a porous ceramic was used, but the present invention is not limited to this, and it is also possible to use a ceramic whose main material is silicon carbide that does not become porous. Needless to say, the effect can be obtained.

As explained above, the transformer according to the present invention has a transformer winding housed in a case made of ceramic whose main material is silicon carbide, so it is not affected by external electromagnetic waves and has low distortion and low distortion. It has an excellent effect that the loss ratio can be easily controlled.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of a transformer according to the present invention, and FIG. 2 is a sectional view of a main part of another embodiment of a transformer according to the present invention. 1... Case, 2... Transformer winding,
3... Conductive resin case.

Claims (2)

[Scope of utility model registration request] (1) A transformer comprising a transformer winding around which a coil is wound and a case accommodating the transformer winding, characterized in that the case is made of ceramic whose main material is silicon carbide. (2) The transformer according to claim 1, wherein the case is made of porous ceramic whose main material is silicon carbide.