JP2717017B2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a primary iron core, a secondary iron core, a magnetic path portion, a skin portion, and a window frame that cover the primary iron core and the secondary iron core. And a covering member comprising a cover.

[Prior Art] FIG. 6 is a cross-sectional view of a conventional transformer disclosed in, for example, JP-A-61-174607, in which a transformer (1) has a U-shaped primary iron core (2a) and It has a secondary core (2b).

A primary winding (3a) is wound around the primary core (2a), and a secondary winding (3b) is wound around the secondary core (2b).

Furthermore, the primary core (2a) and the primary winding (3a)
It is covered with a covering member (4) made of plastic or the like which is electrically insulative and transmits magnetic force. The covering member (4) is formed by injection molding, molding, or a primary iron core (2a), The primary winding (3a), the secondary core (2b), and the secondary winding (3b) are coated.

The covering member (4) is composed of a magnetic path (4a) and an outer cover (4b).
And a window frame (4c), and both ends of the primary winding (3a) are connected to a cord (6a) extending outside the covering member (4).

And the secondary core (2b) and the secondary winding (3b)
Is covered with a covering member (5) which is an electrically insulating material and is made of plastic or the like which transmits magnetic force. The covering member (5) is composed of a magnetic path portion (5a), a skin portion (5b) and a window. It consists of a frame (5c) and both ends of the secondary winding (3b) are connected to a cord (6b) extending outside the covering member (5).

The outer skin portions (4b) and (5b) are formed with screw portions (4d) and (5d), and the screw portions (4d) and (5d) are formed.
A nut (7) is screwed into d) so that 1
The secondary side and the secondary side are joined.

 Next, the operation will be described.

When an AC voltage is applied from the cord (6a), a current flows through the primary winding (3a), and a magnetic flux is generated at the primary core (2a) and the secondary core (2b).

Then, this magnetic flux passes from the primary core (2a) to the covering members (4) and (5), passes from the secondary core (2b) to the covering members (5) and (4), and passes through the primary core ( Create a magnetic path back to 2a).

Further, the magnetic flux transmits electric energy or electric signal to the secondary winding (3b) by electromagnetic induction, and outputs electric energy or electric signal to the cord (6b).

[Problem to be Solved by the Invention] Since the conventional transformer is configured as described above, a gap is generated between the primary iron core (2a) and the secondary iron core (2b). As the leakage magnetic flux increases, the leakage inductance increases. The increase in the leakage inductance causes a voltage drop, which makes it difficult to transmit electric power to the secondary side or transmit an accurate electric signal.

In particular, when transmitting a high-frequency AC voltage or a high-frequency electric signal, the impedance due to the leakage inductance is large, and the voltage drop becomes very large. there were.

Further, since the gap is formed by the covering members (4) and (5), the magnetic permeability of the gap portion is deteriorated. Therefore, when the gap is used as a transformer for a switching power supply, the AL value of the transformer is reduced, and the excitation inductance is reduced. Therefore, the exciting current increases. Depending on the circuit system of the switching power supply, this increase in the exciting current increases the loss of the transformer, so that the power transmission efficiency is deteriorated, and it is necessary to select a switching element having a large current capacity due to the increase in the exciting current. In addition, there has been a problem that switching loss increases and power transmission efficiency decreases.

Further, there is a problem that the transformer used for the switching power supply generates radiation noise from the transformer.

The present invention has been made in order to solve the above-described problems, and improves magnetic permeability, reduces magnetic flux leakage due to a gap, and enables adjustment of an AL value to prevent an extreme decrease in the AL value. Another object of the present invention is to provide a transformer that can easily and efficiently transmit electric power, can transmit an accurate electric signal, and has little radiation noise.

[Means for Solving the Problems] A transformer according to the present invention includes a primary iron core, a secondary iron core, a magnetic path portion, an outer skin portion, and a window frame portion covering the primary iron core and the secondary iron core. And a coating member made of a material mixed with a magnetic material, and a mixed amount or a mixed material of the magnetic material is changed in each of the magnetic path portion, the outer skin portion, and the window frame portion. And

[Operation] The transformer according to the present invention reduces the amount of magnetic material mixed in the magnetic path portion, the outer skin portion, and the window frame portion of the covering member, or the amount of the mixed material, reduces the leakage flux of the gap by the magnetic material, and reduces the AL. Prevents the drop of the value, reduces the radiated noise by converting the leakage magnetic flux component into heat as eddy current by the magnetic material on the outer surface of the coating member, and reduces the radiation noise. To adjust.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the transformer (1) has a U-shaped primary iron core (2a) and a secondary iron core (2b).

A primary winding (3a) is wound around the primary core (2a), and a secondary winding (3b) is wound around the secondary core (2b).

Furthermore, the primary core (2a) and the primary winding (3a)
The secondary core (2b) and the secondary winding (3b) are arranged in a case (4) as a covering member made of plastic or the like mixed with a magnetic material. It is arranged in a case (5) as a covering member composed of the above.

The case (4) is composed of a magnetic path (4a), an outer shell (4b) and a window frame (4c). ) Are connected to a cord (6a) extending outside the case (4).

The case (5) is composed of a magnetic path (5a) and a skin (5b).
And a window frame portion (5c), and both ends of the secondary winding (3b) are connected to a cord (6b) extending outside the case (5).

The outer skin portions (4b) and (5b) are formed with screw portions (4d) and (5d), and the screw portions (4d) and (5d) are formed.
A nut (7) is screwed into d) so that 1
The secondary side and the secondary side are joined.

 Next, the operation of the present embodiment will be described.

When an AC voltage is applied from the cord (6a), a current flows through the primary winding (3a) and the primary core (2a) and the secondary core (2a).
Magnetic flux is generated in b) and the magnetic path portions (4a) and (5a) where the magnetic material is mixed.

This magnetic flux is applied to the primary core (2a) and the secondary core (2a).
It passes through magnetic path portions (4a) and (5a) which are gaps with b).

Since the magnetic material is mixed in the magnetic path portions (4a) and (5a), the magnetic path portions (4a) and
(5a) Improve the magnetic permeability, reduce the leakage flux and increase the AL value.

The AL value can be adjusted by changing the mixing amount of the magnetic material in the magnetic path portions (4a) and (5a).

In addition, the outer skin portions (4b) of the cases (4) and (5),
Since the magnetic material is mixed in (5b), the leakage magnetic flux component is converted into heat as eddy current, and radiation noise radiated to the outside is reduced.

Furthermore, window frames (4c) and (5c) of cases (4) and (5)
The amount of mixed magnetic material is extremely small or zero compared with the magnetic path portions (4a) and (5a) and the outer cover portions (4b) and (5b), thereby preventing an increase in leakage magnetic flux.

Then, the window frame portions (4c) of the cases (4) and (5),
It is also possible to mix a substance with poor magnetic permeability in (5c) to prevent an increase in leakage magnetic flux.

Next, a partially modified embodiment will be described with reference to FIG. The same parts as those in FIG.

In the example shown in FIG. 2, the gap between the case (4) and the primary core (2a), the primary winding (3a) and the case (5) and the secondary core (2b), the secondary winding The gap with the line (3b) is molded with a filler made of an electrically insulating material. In the figure, the one shown by (8) is the outer skin of the molded part, and the part (9) is the window frame part of the molded part. .

Therefore, as in the case (4b) and (5b) of the case (4) and (5), by mixing the magnetic material, the outer cover (8) can convert the leakage magnetic flux component into heat as an eddy current, Reduces radiation noise radiated to the outside.

The window frame (9) controls the mixing amount of the magnetic material with the magnetic path (4) similarly to the window frames (4c) and (5c) of the cases (4) and (5).
The leakage flux is prevented from increasing by making the number extremely small or zero compared with the cases (a) and (5a) and the outer skin portions (4b) and (5b).

Further, it is also possible to mix a substance having low magnetic permeability into the window frame portion (9) to prevent an increase in leakage magnetic flux.

In the above embodiment, the primary iron core (2a) and the primary winding (3a) are arranged in the case (4), and
Secondary core (2b) and secondary winding (3b) in case (5)
However, as shown in FIG. 3, the primary core (2a), the primary winding (3a), and the secondary core (2
b) and the secondary winding (3b) may be molded with an electrically insulating material.

Further, in the above embodiment, the primary iron core (2a) and the secondary iron core (2b) have a U-shape. However, the present invention is not limited to this, and as shown in FIG. May be used. In the figure, the part indicated by (10) is a magnetic path part of the mold part. By mixing a magnetic material into this part, the magnetic permeability of the magnetic path part (10) which is a gap is improved, Decrease magnetic flux to increase AL value.

The AL value can be adjusted by changing the amount of the magnetic material mixed in the magnetic path portion (10).

Further, in the above-described embodiment, the magnetic material is mixed in the constituent members. However, the present invention is not limited to this, and the surface of each constituent member may be coated with a magnetic material.

In the above embodiment, the case where the mixing amount of the magnetic material is changed has been described. However, the same effect can be obtained even when the mixing amount of the magnetic material is changed in the magnetic path portion, the outer skin portion, and the window frame portion.

FIG. 4 shows an example in which the transformer (1) shown in FIG. 3 is used as an electromagnetic outlet, and the primary side of the transformer (1) is fixed to a wall (11) by screws (12).
The primary winding (3a) is connected to the commercial power supply (1
3), and the secondary winding (3b) connects a load (for example, a desk lamp) (14) via a cord (6b).

With this configuration, by connecting the secondary side of the transformer (1) to the primary side, power can be supplied to the load (14) efficiently and with almost no emission noise.

FIG. 5 shows an example in which the transformer (1) shown in FIG. 3 is used as a non-contact power supply device. This non-contact power supply device converts an AC voltage supplied from a commercial power supply (13) into an AC power. The DC / DC converter (16) converts the DC voltage into a DC voltage, and the DC / AC converter (17) converts the DC voltage into a high-frequency AC voltage, which is applied to the primary winding (3a).

Then, electric energy is transmitted to the secondary winding (3b) by electromagnetic induction, converted into a DC voltage by the AC / DC converter (18), and supplied to the load (14).

In this case, since a high-frequency alternating current is applied,
An electromagnetic outlet using a practical small and lightweight transformer can be configured, and a highly efficient non-contact power supply device with little noise can be obtained.

[Effects of the Invention] As described above, according to the present invention, the covering member including the magnetic path portion, the outer cover portion, and the window frame portion covering the primary side core and the secondary side core is made of a material mixed with a magnetic material. Make up,
In addition, since the mixing amount or the contaminant of the magnetic material is changed in each of the magnetic path portion, the outer skin portion and the window frame portion, the magnetic material reduces the leakage magnetic flux in the gap and reduces the leakage inductance. To reduce the voltage drop,
Power transmission or accurate electrical signal transmission to the two-magnetic side can be easily performed.

In addition, it is possible to improve the magnetic permeability of the gap portion, prevent a decrease in the AL value, increase the excitation inductance, improve the power transmission efficiency, and thereby select a switching element having a small current capacity. be able to.
In addition, the magnetic material in the outer skin of the covering member converts the leakage magnetic flux component into heat as eddy current, which can reduce radiation noise and adjust the AL value according to the amount of magnetic material mixed or the type of mixed material. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transformer according to a first embodiment of the present invention, FIG. 2 is a sectional view of a transformer according to a second embodiment of the present invention, and FIG.
FIG. 4 is a sectional view of a transformer according to a third embodiment of the present invention, FIG. 4 is a schematic diagram showing an example in which the transformer according to the third embodiment is used as an electromagnetic outlet, and FIG. FIG. 6 is a schematic view showing an example of a case where the present invention is used as a non-contact power supply device, and FIG. 6 is a sectional view of a conventional transformer. In the figure, (1) is a transformer, (2a) is a primary core, and (2b)
Is the secondary core, (4) and (5) are the covering members, (4a) and
(5a) is the magnetic path, (4b) and (5b) are the outer skin, (4c),
(5c) is a window frame part. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A transformer comprising a primary iron core, a secondary iron core, and a coating member comprising a magnetic path portion, a skin portion, and a window frame portion covering the primary side core and the secondary side core. Wherein the magnetic material is mixed with the magnetic material, and the amount of the magnetic material mixed or the mixed material is changed in each of the magnetic path portion, the outer skin portion, and the window frame portion.