JP5495382B2 - Self-cooled cored coil and high-frequency transformer using this coil - Google Patents

Description

  The present invention relates to a self-cooled cored coil such as a transformer, choke, filter, reactor, inductance element, and the like, and a high-frequency transformer formed using the same.

  Conventionally, in a high-frequency transformer or the like, as shown in FIGS. 4 to 5, a primary coil 2 a and a secondary coil 2 b made of insulation-coated rectangular copper wire are respectively provided on left and right vertical winding portions of an upright inner core 1. The bifilar winding edgewise coil 3 may be equipped. The bifilar wound edgewise coil 3 in this case can improve the electromagnetic coupling between the primary coil and the secondary coil as compared with the bifilar wound coil of the insulation-coated round copper wire, can increase the number of turns, and Even if the cross-sectional area of the copper wire is increased, the effective cross-sectional area is hardly reduced by reducing the skin effect, which is suitable for a high-frequency transformer for large current / high power. The present invention makes possible further progress and development by enabling strong self-cooling of the coil while taking advantage of such features.

  By the way, the conventional coil self-cooling means in a high-frequency transformer or the like has a heat sink attached to the coil or the coil or the core (see, for example, Patent Documents 1 to 4).

  However, these heat sinks have a large number of radiating fins protruding, and require a special shape suitable for the coils and cores so that the coils and cores can be equipped with heat transfer. Even if it is not simple (for example, refer to Patent Documents 1 to 3), if it is directly provided on the coil, it becomes more complicated and difficult to manufacture (for example, refer to Patent Document 4). The cost was inevitably high. In addition, if the coil is not provided directly, there is a possibility that the heat conduction performance is lowered and the cooling effect is lowered.

JP 2002-8923 A Japanese Utility Model Publication No. 4-70710 JP 63-50007 A Japanese Patent Publication No. 47-6183

  The present invention aims to solve the above-mentioned conventional problems.

To achieve the above object, the self-cooling cored coil of the present invention includes an inner iron core, a leg provided on the lower end side of the core so as to support the inner iron core in an upright state, In the cored coil composed of the edgewise coil made of insulation coated rectangular copper wire , which is equipped on the left and right vertical windings of the inner iron type core ,
The edgewise coil is formed by electrically and mechanically connecting the upper ends of the left and right edge coils wound around the vertical winding portions with a common upper edgewise coil, and arching the upper edgewise coil. By bending upward in a shape, it is formed so as to be fan-shaped upward and wider than the left and right edgewise coils, and below the left and right edgewise coils to the inside of the upper edgewise coil. A ventilation air-cooling flow path that passes upward from the top is provided.

  The high-frequency transformer of the present invention uses the self-cooling cored coil, and the left and right edgewise coils to the upper edgewise coil are bifilar wound edgewise coils of a primary coil and a secondary coil. Any one or both are formed as a single body or a plurality of divided bodies.

  In the self-cooled cored coil according to the present invention, when the left and right edgewise coils and the upper edgewise coil in the vertical direction generate heat by energization, the air in each ventilation air cooling channel is heated by this heat. As a result, a chimney effect is generated in each ventilation air-cooling flow path, and outside air is strongly drawn into the ventilation air-cooling flow path from the lower side and rises, and vigorously moves upward from the gap of the upper edgewise coil. leak. At this time, the upper edgewise coil functions as a forced cooling heat dissipation fin, the upper edgewise coil is forcibly cooled by the air flow, and the heat of the upper edgewise coil rises from the left and right edgewise coils. Both are discharged outside. In other words, outside air flows vigorously in each ventilation air cooling channel by natural convection, and the entire coil is forcibly cooled by the upper edgewise coil. Further, the upper edgewise coil limits the leakage magnetic flux from the upper part of the entire coil, and improves the efficiency. In addition, in the high frequency transformer according to the present invention, the left and right edgewise coils or the upper edgewise coil are bifilar wound edgewise coils of a primary coil and a secondary coil. The magnetic coupling between them can be improved, the number of turns can be increased, and either one or both of the primary coil and the secondary coil are made into a single body or a plurality of divided bodies. The primary and secondary voltages / currents, electromagnetic performance, and the like can be selected as appropriate by appropriately connecting them in a single or series / parallel manner, and a flexible high-frequency transformer can be obtained.

  Therefore, according to the present invention, the entire coil is efficiently cooled, and the upper edgewise coil also serves as a heat sink, the structure is simplified, the manufacturing is easy, and the cost can be reduced. Therefore, the intended purpose can be achieved.

It is a front view of the high frequency transformer which shows Example 1 concerning the present invention. It is a top view of the example. It is a side view of the example. It is a front view of the high frequency transformer which shows a prior art example. It is a principal part top view of the example. It is a side view of the example.

  1 to 3 show an embodiment of a high-frequency transformer B using a self-cooling cored coil A according to the present invention.

  The high-frequency transformer B has a self-cooled cored coil A as a main part, and the self-cooled cored coil A is insulated and covered with rectangular coils on left and right vertical windings of an inner iron type core 1 that is erected. In a cored coil equipped with an edgewise coil 3 made of copper wire, the upper ends of both edgewise coils 3 are electrically and mechanically continuously connected by a common upper edgewise coil 4 bent upwardly in an arch shape. The ventilation air-cooling flow path 5 is provided on the inner side from the lower ends of the both edgewise coils 3 to the upper edgewise coil 4 so as to pass upward from below. Securing the ventilation air-cooling flow path and maintaining the position of the edgewise coils is achieved by interposing a suitably shaped winding frame, spacer, support member, or the like between the core and the edgewise coils. This can be done simply and easily.

  In the high frequency transformer B, the left and right edgewise coils 3 and the upper edgewise coil 4 are bifilar wound edgewise coils of a common primary coil 2a and secondary coil 2b. In the illustrated example, both the primary coil 2a and the secondary coil 2b are single bodies, but either one or both may be divided into a plurality of divided bodies.

  The upright inner iron core 1 is expressed by the chemical formula MOFe2 O3 (M: divalent metal), which has high permeability in the high frequency band, high saturation magnetic flux density, high specific electric resistance and low eddy current loss. A pair of U-shaped cores 6 made of soft ferrite are butted up and down and fastened by a binding band 7. Further, a leg 10 is provided by sandwiching a pair of front and rear brackets 8 at the lower end of the core 1 and tightening them with two bolts and nuts 9.

  With the above configuration, in the self-cooled cored coil A of the high-frequency transformer B, when the left and right edgewise coils 3 and the upper edgewise coil 4 generate heat when energized, the air in the ventilation air cooling channel 5 is heated. A natural convection ascending air flow is generated in the ventilation air cooling channel 5, and the flow velocity of this rising air flow is promoted by the chimney effect in the ventilation air cooling channel 5, and the outside air is strong in the ventilation air cooling channel 5 from below. It is inhaled and rises, and is expelled upward. Therefore, the both edgewise coils 3 and the upper edgewise coil 4 are forcibly cooled by the strong and vigorous ventilation. At this time, the upper edgewise coil 4 is also affected by the conduction heat rising from both edgewise coils 3. Although it is heated, it is widely fanned upward by an upward arched curve, so it functions as a forced cooling heat dissipation fin and is powerfully and efficiently cooled, resulting in the Temperature rise is reduced. This also contributes to energy saving. Moreover, the upper edgewise coil 4 reduces the leakage magnetic flux from the upper part in the whole coil and improves the efficiency.

  In the high-frequency transformer B, the left and right edgewise coils 3 and the upper edgewise coil 4 are all bifilar wound edgewise coils of a primary coil 2a and a secondary coil 2b, so that they can be used for high-frequency high-current and high-power. it can. In addition, by making either one or both of the primary coil 2a and the secondary coil 2b into a single body or a plurality of divided bodies, the primary coil 2a and the secondary coil 2b can be electrically connected appropriately in a single or series / parallel manner. -Secondary voltage / current, electromagnetic performance, etc. can be selected as appropriate.

A Self-cooled cored coil B High-frequency transformer 1 Inner iron core 2a Primary coil 2b Secondary coil 3 Left and right edgewise coils 4 Upper edgewise coil 5 Ventilation air cooling channel 6 U-shaped core 7 Binding band 8 Bracket 9 Bolt Nut 10 Leg

Claims (2)

The inner iron type core, the legs provided on the lower end side of the core to support the inner iron type core in an upright state, and the left and right vertical winding portions of the raised inner iron type core are mounted. In addition, in a cored coil composed of an edgewise coil made of insulating coated rectangular copper wire,
The edgewise coil is formed by electrically and mechanically connecting the upper ends of the left and right edge coils wound around the vertical winding portions with a common upper edgewise coil, and arching the upper edgewise coil. By bending upward in a shape, it is formed so as to be fan-shaped upward and wider than the left and right edgewise coils, and below the left and right edgewise coils to the inside of the upper edgewise coil. A self-cooled cored coil provided with a ventilating air-cooling flow path extending upward from the air.   The self-cooled cored coil according to claim 1 is used, and the left and right edgewise coils to the upper edgewise coil are bifilar wound edgewise coils of a primary coil and a secondary coil, and any one to A high frequency transformer in which both are formed as a single body or a plurality of divided bodies.