JPH04108809U - Multilayer insulated wire for high frequency transformer winding - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an insulated wire for winding suitable for high frequency transformers, etc. [Configuration] I. on the outer circumference of the small diameter conductor 1. A wound layer of heat-resistant plastic film, b. Extruded layer of heat-resistant resin or c. One insulating layer 3a of the heat-resistant paint film layer is provided to form an insulated wire. A bundled insulated conductor 2 is formed by converging a plurality of insulated wires into a circular cross-section. On this outer periphery, two insulating layers 3b and 3c made of the above A, B, C or any combination thereof are provided. Any two of the three layers are formed so as to maintain specified withstand voltage characteristics. Further, the three layers are independent and can be separated. [Effect] As an insulated wire for winding of a transformer that complies with various safety standards such as IEC and UL, it is possible to suppress heat generation in the switching transformer even when the switching frequency is increased to a high frequency.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a high-frequency transformer used in switching power supplies of electronic equipment, The present invention relates to an insulated wire for winding suitable for actuators or high-frequency coils.

0002

[Conventional technology]

Insulated wire for winding of switching power supplies is generally made of polyurethane on a single conductor. Magnet wires coated with an insulating layer of resin, polyester resin, etc. are mainly used. It is being Regarding safety transformers such as switching power supplies, IEC (Inter National Electrotechnical Commission) or UL (Standards of Underwriter) 's Laboratories, Inc.,) are subject to the following restrictions based on various safety standards. (1) Insulating withstand voltage is established between the layers of the electric wire and between the primary and secondary windings through a specified insulating film. Guarantee. (2) To ensure the creepage distance between the windings and core, place an insulating material between the windings and core. Perform insulation. This imposes restrictions on the winding space. (3) When pulling out the lead wire to the pin terminal, insulate it using an insulating tube, etc. It is necessary to

0003 Due to such safety standard restrictions, when using magnet wire, the transformer It may be difficult to miniaturize the device, or it may require a large number of parts and man-hours to perform various insulation treatments. This causes problems such as increasing costs and making it difficult to obtain small, high-performance transformers. It was. Therefore, the present inventors filed Utility Application No. 2-49802 or Japanese Patent Application No. 2-150174. We proposed the use of three-layer insulated wires for transformer windings as described in It is possible to meet safety standards such as UL.

0004

[Problem that the idea aims to solve]

Switching power supplies have a switching frequency for the purpose of improving switching efficiency. High frequencies from several tens of KHz to several hundred KHz have come to be applied to many applications. deer However, in the high frequency band as mentioned above, eddy current loss in the conductor of the transformer winding and table The loss due to the skin effect becomes noticeable, leading to an increase in the heat output of the transformer, and the insulated wire for winding In addition, there has been a fear that the characteristics of the transformer may deteriorate.

[0005] This invention was devised to solve the above problems, and it complies with the various safety standards mentioned above. Even if the switching frequency is in a high frequency band, the heat generation amount of the transformer is It is an object of the present invention to provide an insulated wire for transformer windings that can reduce the amount of energy used.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, the present invention has developed a heat-resistant plastic film around the outer periphery of the small diameter conductor. An insulating layer consisting of a wound layer of film, an extruded layer of heat-resistant resin, or a coated layer of heat-resistant paint. A heat-resistant plastic is placed on the outer periphery of the bundled insulated conductor, which is made up of multiple insulated wires with a single layer of Wound layer of stick film, extrusion layer of heat-resistant resin, coating layer of heat-resistant paint, or At least two insulating layers made of a combination of these insulating layers are provided, and the insulating layer is Any of at least three layers consisting of an insulating layer on the edge wire and an insulating layer on the focused insulated conductor The above three insulating layers are formed to maintain specified withstand voltage characteristics. A high-frequency insulating layer characterized in that each layer of the insulating layer is independent and separable. Multilayer insulated wire for wave transformer winding (hereinafter abbreviated as multilayer insulated wire). of this invention The bundled insulated conductor bundles the plurality of insulated wires substantially parallel to each other and has a circular cross section. Alternatively, multiple insulated wires may be twisted together, concentrically twisted, or litz twisted. The fibers may be twisted together to have a circular cross-section by a method such as the above.

[0007] The strand conductor of this invention is a small diameter conductor such as copper wire, copper alloy wire, or tin or solder plated copper wire. The body is used. The size of this small diameter conductor starts from 0.08mm (AWG40) Generally, it is in the range of 0.20 mm (AWG32).

[0008] The insulation layer of the multilayer insulated wire is a heat-resistant plastic film, such as polyethylene. Midofilm. Aromatic polyamide film, polyetheretherketone film film, polyphenylene sulfide (PPS) film, or polyester film A wound layer is used in which a conductor is wound with a certain overlapping portion. Also, above After providing a heat-sensitive adhesive layer on the heat-resistant plastic film described above and winding the film, It is also possible to fuse and integrate by heat treatment. Furthermore, if necessary, each insulating layer In order to clearly identify each insulating layer film, use a film with a different color. Alternatively, each layer is may be colored in different hues.

[0009] For the extrusion layer of heat-resistant resin, heat-resistant resin such as various fluororesins or various An extruded layer made by layering engineering plastic etc. on the conductor multiple times and extruding it is used. I can stay. In addition, if necessary, each insulating layer resin can be used to clearly identify each insulating layer. Each layer may be colored in a different hue by using a method such as using resin with a different hue. stomach.

0010 Fluororesin dispersion paints and silicone coatings are used as the coating layer of heat-resistant paints. Usually multiple paints are made by dispersing con-acrylic resin, fluorinated acrylic resin, etc. in a solvent. Apply several times to form a coating film. In this method, each layer has a different hue in the same way as above. You can also color it.

[0011] The meaning that each layer of the three insulating layers is independent and separable means that each insulating layer is independent. A layer that can be peeled off separately and exists as an independent layer. Peeling the insulation layer The removal method is to use a stripper, or to make slits in the insulation layer. method of inserting and removing the insulating layer, burning off the insulating layer with a hot blade, or using a wound fibre. There are methods of separating the membrane by unwinding it. On the other hand, magnetic The ear film is formed by applying insulating paint multiple times around the conductor and baking it. The coating forms a single insulating layer and it is impossible to separate each layer. This is not recognized as a multilayer insulated wire.

0012

[Effect]

The focused insulated conductor of the present invention focuses multiple insulated wires approximately in parallel and with a circular cross section. Or, it is made by twisting multiple insulated wires and converging them into a circular cross section. Since each conductor of the insulated wire is insulated, the generation of eddy current is kept to a low level. Therefore, the increase in high frequency resistance due to eddy current loss can be suppressed. Also Focused insulated conductors have a significantly increased conductor surface area compared to solid wire conductors, so they are It becomes possible to significantly improve the increase in loss due to the skin effect. In addition, the insulating element When a plurality of wires are bundled approximately in parallel and have a circular cross section, or when a plurality of the insulated wires are Even when twisting books together and converging them into a circular cross-section, if the twisting pitch is increased, The twisted length of the conductors used can be shortened, without reducing the DC resistance of the coil. It becomes possible to

[0013] In addition, the multilayer insulated wire of the present invention has an insulating layer on the insulated wire and an insulating layer on the focused insulated conductor. Insulation specified by safety standards with any two of at least three layers consisting of It is formed to maintain the proof stress (3.75KV in case of IEC 950). is recognized as an insulated wire for winding with sufficient insulation properties according to safety standards, and the above-mentioned changes are Freed from many restrictions imposed on pressure vessels.

[0014]

【Example】

An embodiment of the present invention will be explained using the drawings. Please note that this invention is limited to the examples. It's not something you can do. Example 1 FIG. 1 is a sectional view showing a first embodiment of the multilayer insulated wire of the present invention. Element wire conductor 1 A copper wire with a conductor diameter of 0.12 mmφ is used as Apply oleoethylene (PTFE) dispersion paint to a film thickness of 0.04 A primary insulating layer 3a of mm was provided to form an insulated wire. Next, we cut these 19 insulated wires into circular cross-sections. The fibers are bundled at a twisting pitch of 30mm to form a bundled insulated conductor 2 with a bundled outer diameter of 1.00mm. did. Next, natural-colored fluoride is applied to the outer periphery of the focused insulated conductor 2 as a secondary insulating layer 3b. Tylene propylene resin (FEP) (Teflon 100J, Mitsui DuPont Fluoro An extruded layer of approximately 0.06 mm thick is provided, and the outer periphery of this layer is As the tertiary insulating layer 3c, FEP colored blue was extruded to a thickness of about 0.06 mm. A three-layer insulated wire 4 was manufactured by providing an outer layer. The insulation layer 3 of this three-layer insulated wire 4 is coated Either by making slits on the surface or using a stripper. It was possible to separate each layer.

[0015] Example 2 FIG. 2 is a sectional view showing a second embodiment of the multilayer insulated wire of the present invention. Element wire conductor 1 A copper wire with a conductor diameter of 0.12 mmφ was used as the conductor, and natural-colored FEP was applied to the outer circumference of this copper wire 1. It was extruded to a thickness of 0.04 mm and a primary insulating layer 3a was provided thereon to obtain an insulated wire. Next, this absolute A bundled insulated conductor with a bundled outer diameter of 1.00mm is made by converging 19 edge wires approximately parallel to each other in a circular cross-section. Body 2 was formed. Next, a white secondary insulating layer 3b is applied to the outer periphery of this focused insulated conductor 2. Wrap colored PPS film (3.5 mm width x 0.03 mm thickness) in 1/2 wrap. A PPS film colored white is provided on the outer periphery as a tertiary insulating layer 3c. A layer of 1/2 wrap of film (3.5 mm width x 0.03 mm thickness) is provided. A three-layer insulated wire 4 was manufactured. The primary insulating layer 3a of the insulating layer 3 of this three-layer insulated wire 4 is The stripper, the secondary insulating layer 3b and the tertiary insulating layer 3c separate the respective films. Separation was possible by unwinding.

[0016] Withstand voltage characteristics Samples with each insulation layer were collected for the multilayer insulated wires of Example 1 and Example 2. The results of testing the outer diameter and withstand voltage characteristics are shown in Table 1. No difference was observed between them.

[0017]

[Table 1]

[0018] Note (1) in the above table indicates the breakdown voltage for 10 mmφ mandrel winding (15 turn winding). ). As is clear from Table 1, the insulated wires with the above structure meet the IEC950 standard. The voltage characteristics were 3.75 KV for 1 minute.

[0019] Transformer temperature rise test A switching transformer using the three-layer insulated wire of Example 1 of the present invention as a secondary winding. Switching transformer using 0.60mm class 0 polyurethane copper wire as secondary winding was manufactured with the other components being exactly the same. Used for switching power supply with output of 136W For a switching transformer with an oscillation frequency of 50 KHz, these switches The switching transformer is operated at an output voltage of 161 V and 0.5 A, and the switching at that time is The surface temperature of the transformer winding was measured using a thermistor thermometer. The results are shown in Table 2. show.

[0020]

[Table 2]

[0021] As is clear from Table 2, the switching transformer using the multilayer insulated wire of the present invention is It was found that the temperature was reduced by 6.3℃ compared to a transformer using conventional single copper wire. Karu.

[0022]

[Effect of the idea]

The multilayer insulated wire of this invention is made by converging multiple insulated wires approximately parallel to each other with a circular cross section. A bundled insulated conductor, or a plurality of the insulated wires are twisted together to form a circular cross section. Eddy current loss and skin effect generated in the conductor can be reduced by using bundled, focused insulated conductors. Heat generation due to loss is significantly reduced, and even when the switching frequency is increased, the speed is reduced. It is possible to suppress the heat generation of the switching transformer, and as a result, switching power supplies efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of a multilayer insulated wire for winding a high frequency transformer according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the multilayer insulated wire for high frequency transformer winding of the present invention.

[Explanation of symbols]

1 Small diameter conductor 2 Focused insulated conductor 3 Insulating layer 3a Primary insulation layer 3b Secondary insulation layer 3c Tertiary insulation layer 4 Multilayer insulated wire for high frequency transformer winding

Claims (3)

[Scope of utility model registration request] [Claim 1] A plurality of insulated wires each having an insulating layer formed of a wound layer of a heat-resistant plastic film, an extruded layer of a heat-resistant resin, or a coating layer of a heat-resistant paint on the outer periphery of a small-diameter conductor are bundled. At least two insulating layers consisting of a wound layer of a heat-resistant plastic film, an extruded layer of a heat-resistant resin, a painted film layer of a heat-resistant paint, or a combination of these insulating layers are placed on the outer periphery of the focused insulated conductor. The layer is formed so that any two of the at least three layers consisting of the insulating layer of the insulated wire and the insulating layer on the focused insulated conductor maintain a specified withstand voltage characteristic, and the three layers A multilayer insulated wire for high frequency transformer winding, characterized in that each of the insulation layers is independent and separable. 2. A high frequency transformer winding according to claim 1, wherein the focused insulated conductor is a focused insulated conductor in which a plurality of the insulated wires are focused substantially in parallel and have a circular cross section. Multilayer insulated wire. 3. The multilayer for high frequency transformer winding according to claim 1, wherein the focused insulated conductor is a focused insulated conductor in which a plurality of the insulated wires are twisted together and focused to have a circular cross section. Insulated wire.