JPH11307377A - Insulating transformer and magnetic core unit for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulating transformer which can easily correspond to high insulating resistance, without increasing the weight and the installation space of a power unit. SOLUTION: An insulating transformer is constituted of the combination of a plurality of magnetic core units. A first magnetic core unit 2 is formed of two division magnetic cores 5 and 6, the coil 7 of a single turn, which is interlinked with both division magnetic cores, and an insulating object 8 which integrally form them. Second and third magnetic core units 3 and 4 have magnetic cores 9 and 11 forming a magnetic core of a single turn by jointing them with the magnetic pole face of one division magnetic core in the first magnetic core unit and coils 10 and 12 interlinked with the magnetic cores. When the second and third magnetic core units are combined with one or a plurality of first magnetic core units, an insulating transformer, where more than two insulating transformer main bodies are cascade-connected in two stages, is formed. Thus, insulating resistance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating transformer used for insulating between electric circuits and a magnetic core unit constituting the insulating transformer. The insulation transformer of the present invention is used, for example, as an insulation transformer for a control power supply.

[0002]

2. Description of the Related Art A conventional isolation transformer 31 for a control power supply comprises:
As shown in FIG. 1, the primary coil 3
The transformer body around which the third and secondary coils 34 are wound is integrally molded with an epoxy resin 35 to be configured. As such an insulating transformer for a control power supply, one having a dielectric strength of 2000 V or less is usually used. However,
Depending on the use environment and use conditions, a withstand voltage of 2000 V or more may be required for the isolation transformer for the control power supply. In this case, the above-mentioned insulating transformer for control power supply having a withstand voltage of 2000 V or less cannot be used. Therefore, use a large-capacity insulating transformer for another purpose other than for control power supply, or as shown in FIG. Cascade connection of a plurality of control power insulating transformers 31 is performed. In FIG. 2, the illustration of the epoxy resin 35 is omitted.

[0003]

When a high dielectric strength is required as described above, an insulating transformer for another purpose is used as an insulating transformer for a control power supply, or a plurality of insulating transformers are connected in cascade. The use greatly increases the weight and installation space of the power supply.

An object of the present invention is to provide an insulating transformer which can easily cope with a high dielectric strength without increasing the weight and installation space of the power supply device.

[0005]

According to the present invention, in order to achieve the above object, an insulating transformer comprises a combination of a plurality of magnetic core units. The first core unit is
Two divided magnetic cores having magnetic pole faces formed at both ends, a one-turn coil interlinking with both of the two divided magnetic cores, and two divided magnetic cores in a state where the magnetic pole faces of the two divided magnetic cores are exposed to the outside. And an insulator integrally formed with the coil.

The second core unit and the third core unit are joined to a magnetic pole surface exposed to the outside of one of the split cores of the first core unit to form a one-turn core, and this core is And a coil that interlinks. When the first and second core units are combined with the first core unit, an insulating transformer in which two insulating transformers are connected in a two-stage cascade is formed. Therefore, the dielectric strength can be improved. When a higher dielectric strength is required, a plurality of first core units may be connected to increase the number of cascade-connected transformers.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration of the insulating transformer. The insulating transformer 1 includes a first magnetic core unit 2, a second magnetic core unit 3, and a third magnetic core unit 4. FIG. 4 shows a state where the magnetic core units 2, 3, and 4 constituting the insulating transformer are separated. The first magnetic core unit 2 includes two divided magnetic cores 5 and 6, a one-turn coil 7 commonly wound around the two divided magnetic cores 5 and 6, and integrally molded with the divided magnetic cores 5 and 6 and the coil 7. It is formed from the epoxy resin 8 to be used. In each of the drawings, only the epoxy resin 8 is shown in cross section. Each split core 5,6
Exposes the magnetic pole surface formed on the divided surface (end) to the outside of the epoxy resin 8. The coil 7 is electrically connected to one of the two divided cores 5 and 6 by the lead wire 13.

[0008] The second core unit 3 includes a split core 9 and
It is formed by a coil 10 wound around the split magnetic core 9. A magnetic pole surface that is in contact with the magnetic pole surface of the split magnetic core 5 of the first magnetic core unit 2 is formed on the split surface (end) of the split magnetic core 9. The third magnetic core unit 4 is formed by a split magnetic core 11 and a coil 12 wound around the split magnetic core 11. A magnetic pole surface that is in contact with the magnetic pole surface of the split magnetic core 6 of the first magnetic core unit 2 is formed on the split surface of the split magnetic core 11.

The three magnetic core units 2, 3, and 4 are combined as shown in FIG. At this time, one of the divided cores 5 of the first magnetic core unit 2 and the divided magnetic core 9 of the second magnetic core unit 3 abut one another on their magnetic pole faces to form a one-turn magnetic core.
Two coils 10, 7 are wound around this magnetic core to form a transformer body.

Further, the other divided core 6 of the first magnetic core unit 2 and the divided magnetic core 11 of the third magnetic core unit 4 abut one another with their magnetic pole faces to form a one-turn magnetic core. Two coils 12, 7 are wound around this magnetic core to form a transformer main body. First magnetic core unit 1
Coil 7 is wound around two magnetic cores 5 and 6 in common, and
Since the two magnetic cores are electromagnetically coupled, the insulating transformer 1 shown in FIG. 3 has two transformer bodies connected in a two-stage cascade.

The coil 7 of the first magnetic core unit 2 is electrically connected to one of the divided magnetic cores 5 by a lead wire 13, so that the insulation between the coil 10 and the coil 12 of the insulating transformer 1 It is determined by insulation between the split core 9, between the coil 7 and the split core 6, and between the split core 4 and the coil 12. Arbitrary means can be adopted as a means for combining the three magnetic core units 2, 3, and 4. For example, the magnetic cores 9 and 11 of the second and third magnetic core units 3 and 4 can be fixed to the magnetic cores 5 and 6 of the first magnetic core unit 2 with bolts. Alternatively, the entire insulating transformer 1 can be tightened and fixed by a band.

According to the insulating transformer described above, various effects can be expected. First, when each of the coils 7, 10, 12 is wound around the magnetic cores 5, 6, 9, 11, the work of winding the coils is simplified since each magnetic core is constituted by a divided magnetic core. In addition, since the coil 7 is configured with only one turn, the coil can be easily manufactured. Further, since the two transformer bodies are integrally formed, the handling is easy and the miniaturization can be expected.

FIG. 5 shows another embodiment of the present invention. When a higher dielectric strength is required for the insulating transformer 1, it can be easily dealt with by increasing the number of the first magnetic core units 2. The insulating transformer shown in FIG. 5 is formed by providing two first magnetic core units 2 between the second magnetic core unit 3 and the third magnetic core unit 4. This gives 3
The set of insulating transformer bodies is cascaded, and a higher dielectric strength than the insulating transformer 1 shown in FIG. 3 is realized. If higher insulation is required, the first
Can be dealt with by increasing the number of magnetic core units 2.

As described above, in the example shown in FIG. 5, when the first magnetic core unit 2 is added, it is only necessary to increase the number of standardized magnetic core units. Therefore, there is no need to prepare an insulation transformer of another specification. Further, it can be expected that the installation space can be prevented from increasing. further,
By appropriately providing a structure for assembling in the magnetic core unit, the assembling work can be simplified.

FIG. 6 shows another embodiment of the present invention. The insulating transformer 22 of the present embodiment includes a second magnetic core unit 14 and a third magnetic core unit 1 connected to the first magnetic core unit 2.
5 in the same manner as the first magnetic core unit 2,
8 and 19 are integrally molded. In the second magnetic core unit 14, a transformer main body including a magnetic core 16 and a coil 17 is integrally molded with an epoxy resin 18. The third magnetic core unit 15 integrally molds the magnetic core 19 and the coil 20 with the epoxy resin 19.

According to this configuration, since the magnetic cores 16 and 19 and the coils 17 and 20 are covered and protected by the epoxy resins 18 and 19, the second and third magnetic core units 3 and 3 are protected.
4 becomes easy to handle. Also, epoxy resin 8,1
Providing the connecting means at the time of assembling in 8, 19 can simplify the assembling work. The example in which the present invention is applied to the insulating transformer for the control power supply has been described above. However, the present invention is not limited to this application, and can be generally used for the insulating transformer.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a conventional control power insulating transformer.

FIG. 2 is a diagram showing an insulating transformer in which a plurality of the transformers of FIG. 1 are connected in cascade.

FIG. 3 is a diagram showing a configuration of an insulating transformer to which the present invention is applied.

FIG. 4 is a diagram showing the insulating transformer of FIG. 3 separately for each unit.

FIG. 5 is a diagram showing a configuration of an insulating transformer according to another embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an insulating transformer according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulation transformer 2 ... 1st magnetic core unit 3 ... 2nd magnetic core unit 4 ... 3rd magnetic core unit 5, 6 ... Split magnetic core 7 ... Coil 8 ... Epoxy resin 9, 11 ... Split magnetic core 10, 12 ... Coil 13 ... Lead wire 14 ... Second magnetic core unit 15 ... Third magnetic core unit 16, 19 ... Split magnetic core 17, 20 ... Coil 18, 21 ... Epoxy resin 22 ... Insulation transformer

Claims (4)

[Claims] 1. Two divided magnetic cores each having a magnetic pole face formed at both ends, a one-turn coil linked to both of the two divided magnetic cores, and a state in which the magnetic pole faces of the two divided magnetic cores are exposed to the outside. A first magnetic core unit composed of an insulator that integrally forms the two divided magnetic cores and the coil; and a magnetic pole surface exposed to the outside of one of the divided magnetic cores of the first magnetic core unit. A magnetic core forming a one-turn magnetic core, and a coil interlinking with the magnetic core.
A magnetic core unit that forms a one-turn magnetic core by joining with a magnetic pole surface exposed to the outside of the other one of the divided magnetic cores of the first magnetic core unit, and a coil that interlinks with the magnetic core. And a third magnetic core unit. 2. The second core unit and the third core unit, wherein the magnetic core and the coil are integrally formed of an insulator, and a magnetic pole surface of the magnetic core is exposed to the outside. Insulation transformer. 3. The insulation transformer according to claim 1, wherein a plurality of the first core units are provided between the second core unit and the third core unit. 4. A split core having magnetic pole faces formed at both ends, a one-turn coil interlinking with both of the split magnetic cores, and a state where the magnetic pole faces of the two split magnetic cores are exposed to the outside. A magnetic core unit for an insulating transformer, comprising: an insulator for integrally molding the two divided magnetic cores and the coil.