CN216054211U - Parallel transformer - Google Patents

Abstract

The utility model provides a parallel transformer, which comprises two transformers, wherein each transformer comprises: the magnetic core is arranged on the framework, and the primary winding and the secondary winding are wound on the framework. The primary windings on the two transformers are both copper foils, and a lead is welded between the primary windings on the two transformers, or the primary windings and the lead on the two transformers are formed by winding a winding wire. The primary windings of the two transformers are directly wound by one winding wire or connected by a lead wire, and further, the outgoing positions of the primary windings in the two transformers are not required to be connected in a welding mode, and an insulating tape is not required to be wound at the position of a welding port, so that the size is reduced, the resistance of connection between the two transformers is reduced, the heat generation is reduced, the production procedures are reduced, the parallel connection of the transformers is facilitated, and the production efficiency is improved.

Description

Parallel transformer

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of transformers, in particular to a parallel transformer.

[ background of the utility model ]

As is well known, a transformer is a device for transforming voltage, current and impedance, when an alternating current is passed through a primary winding, an alternating magnetic flux is generated in an iron core or a magnetic core, and a voltage or a current is induced in a secondary winding. At present, when the capacity of one transformer is insufficient when the load is increased, the load is often connected in parallel to another transformer for use so as to improve the reliability of power supply, when one transformer is damaged, the transformer can be switched out for maintenance, the other transformer continues to supply power, the number of the transformers can be adjusted according to the size of the load, and the transformers are used for averaging the load rate, reducing the loss of the transformers and reducing the capacity electricity charge.

However, in the existing parallel transformer, each winding of the transformer needs to be welded to form a lead, and a heat-shrinkable sleeve is sleeved on the lead, then the leads of the two transformers are welded on the outer sides of the two transformers, so that the corresponding windings of the two transformers are welded, and then the leads at the welding positions are insulated by an insulating tape. The mode is used for connecting the voltage transformers in parallel, direct current resistance is easily increased, the lead is subjected to cold welding and false welding, the product consistency is poor, the size of the lead part is increased due to the fact that the sleeve is sleeved with the thermal shrinkage down, and the layout of a PCB of a customer is affected. In addition, the internal framework of the existing transformer is generally provided with pins, and then a winding needs to be wound on the pins during assembly, so that the assembly is complicated, the assembly is not easy, and the two existing transformers are close together and are not easy to dissipate heat.

Accordingly, the prior art is in need of improvement and development.

[ Utility model ] content

The utility model aims to provide a shunt transformer, which is used for solving the problems that direct-current resistance is increased and the layout of a PCB (printed circuit board) of a client is influenced by volume increase caused by the fact that the existing shunt transformer winding is welded by adopting a connected lead wire to realize parallel connection.

The technical scheme of the utility model is as follows: a shunt transformer comprising two transformers, each of said transformers comprising: the transformer comprises a framework, a magnetic core arranged on the framework, and a primary winding and a secondary winding wound on the framework;

copper foil is arranged between the primary windings of the two transformers, and a lead is welded between the primary windings of the two transformers; or the primary windings on the two transformers are formed by winding one winding wire or copper foil.

Furthermore, the bottom of the framework extends outwards to form a limiting plate, and a plurality of limiting holes are formed in the limiting plate; the limiting hole is arranged at one end, which is not connected with the primary windings of the two transformers, and at the two ends of the secondary winding of each transformer in a penetrating mode.

Furthermore, the parallel transformer further comprises a substrate, the two transformers are arranged on the substrate at intervals, via holes are formed in the substrate, and the ends, which are not connected, of the primary windings of the two transformers and the two ends, which are not connected, of the secondary windings of each transformer, penetrate through the via holes and are arranged on the outer side of the substrate.

Furthermore, the shunt transformer further comprises an outer-wrapping adhesive tape, and the outer-wrapping adhesive tape is wound on the outer side of the whole body formed by the substrate and the two transformers.

Further, the secondary winding comprises a first winding and a fourth winding, and the first winding and the fourth winding are connected in parallel; the first winding, the primary winding and the fourth winding are sequentially wound on the outer side wall of the framework from inside to outside.

Further, the primary winding comprises a second winding and a third winding, the second winding is connected with the third winding in parallel, and the third winding is located between the second winding and the fourth winding; the second windings on the two transformers and the third windings on the two transformers are connected through lead wires, or the second windings on the two transformers and the third windings on the two transformers are respectively formed by winding a winding wire or a copper foil.

Furthermore, insulating layers are arranged between the framework and the first winding, between the first winding and the second winding, between the second winding and the third winding, between the third winding and the fourth winding and outside the fourth winding.

Further, the magnetic core comprises an upper magnetic body and a lower magnetic body which are E-shaped; go up the magnet and overlap respectively with lower magnet and locate the first half and the latter half of skeleton, go up the center pillar on magnet and the lower magnet and all arrange in the skeleton.

Further, the first winding and the fourth winding are formed by winding enameled wires.

Further, the insulating layer is an insulating tape.

The utility model has the beneficial effects that: compared with the prior art, the primary windings of the two transformers are directly formed by winding one winding wire or connected by adopting the lead wire, and further, the primary windings in the two transformers are not required to be connected in a welding mode after being led out, and an insulating tape is not required to be wound at the position of a welding port, so that the size is reduced, the resistance of connection between the two transformers is reduced, the heat generation is reduced, the production process is reduced, the parallel connection of the transformers is facilitated, and the production efficiency is improved.

[ description of the drawings ]

Fig. 1 is a perspective view of the present invention.

Fig. 2 is an exploded view of the present invention.

FIG. 3 is a schematic diagram of a circuit symbol according to the present invention.

[ detailed description ] embodiments

The utility model is further described with reference to the following figures and embodiments.

Referring to fig. 1-3, a shunt transformer according to an embodiment of the present invention is shown.

The shunt transformer includes two transformers 10, and each transformer 10 includes: a bobbin 12, a magnetic core 11 provided on the bobbin 12, and a primary winding 15 and a secondary winding 14 wound on the bobbin 12. The primary windings 15 on the two transformers 10 are both copper foils, and a lead 151 is welded between the primary windings 15 on the two transformers 10; or the primary windings 15 of the two transformers 10 are formed by winding a winding wire or a copper foil.

The primary windings 15 of the two transformers 10 are directly formed by winding one winding wire or connected by the lead 151, and further, the primary windings 15 in the two transformers 10 are not required to be connected in a welding mode at the positions after being led out, and an insulating tape is not required to be wound at the position of a welding port, so that the size is reduced, the resistance of connection between the two transformers 10 can be reduced, the heat generation is reduced, the production process can be reduced, the assembly of parallel transformers is facilitated, and the production efficiency is improved.

In an embodiment, a limiting plate 121 is formed by extending the bottom of the frame 12 outwards, and a plurality of limiting holes 122 are formed on the limiting plate 121. The unconnected ends of the primary windings 15 of the two transformers 10 and the two ends of the secondary winding 14 of each transformer 10 are disposed through the limiting holes 122. Since the bobbin 12 of the transformer 10 in the prior art generally has pins, during production, the terminal pins of the winding need to be wound onto the pins to be led out for external connection. In the utility model, the terminal pins of the primary winding 15 and the secondary winding 14 are directly led out by using the limiting holes 122 on the framework 12, so that the terminal pins of the windings do not need to be wound on pins, the production steps are further reduced, and the production efficiency of the transformer 10 is improved.

In an embodiment, the shunt transformer further includes a substrate 20, the two transformers 10 are disposed on the substrate 20 at intervals, via holes are disposed on the substrate 20 at positions corresponding to the limiting holes 122, and the ends of the primary windings 15 of the two transformers 10 that are not connected and the two ends of the secondary winding 14 of each transformer 10 are disposed outside the substrate 20 through the via holes. The two transformers 10 are spaced apart from each other, so that heat dissipation performance can be improved.

It should be noted that, there may also be no gap between the two transformers 10, which is not limited herein.

In an embodiment, the shunt transformer 10 further includes an outer-wrapping tape 30, the outer-wrapping tape 30 is wound on the outer side of the whole body formed by the substrate 20 and the two transformers 10, and specifically, the substrate 20 may be an epoxy board. So as to fix the base plate 20 and the two transformers 10 together and to improve the compactness of the structure of the present invention.

In one embodiment, in order to improve the compactness of the structure of the present invention, the magnetic core 11 includes an upper magnetic body 111 and a lower magnetic body 112 in an E shape, the upper magnetic body 111 and the lower magnetic body 112 are respectively sleeved on the upper half portion and the lower half portion of the frame 12, and the center posts of the upper magnetic body 111 and the lower magnetic body 112 are both disposed in the frame 12.

In an embodiment, the secondary winding 14 may include a first winding 141 and a fourth winding 142, the first winding 141 and the fourth winding 142 being connected in parallel. The primary winding 15 may include a second winding (not shown) and a third winding (not shown), the second winding is connected in parallel with the third winding, and the first winding 141, the second winding, the third winding and the fourth winding 142 are sequentially wound on the outer sidewall of the frame 12 from inside to outside. The second windings on the two transformers 10 are formed by winding one winding wire, and the third windings on the two transformers 10 are formed by winding one winding wire; or the second windings on the two transformers 10 and the third windings on the two transformers 10 are respectively welded by using the lead 151, so that the two transformers 10 do not need to be welded again after the lead 151 is led out, the operation flow is saved, and the lead 151 can be separated by using an insulating tape at the welding position to prevent short circuit. Specifically, the lead 151 is an enameled wire, and the first winding 141 and the fourth winding 142 are wound by the enameled wire. The first winding 141 is N1, the second winding is N2, the third winding is N3, the fourth winding 142 is N4, and the lead 151 is an AB segment, i.e., the circuit symbol of the shunt transformer 10 of the present invention is shown in fig. 3.

In the above embodiment, in order to insulate the windings, the insulating layers 13 are disposed between the bobbin 12 and the first winding 141, between the first winding 141 and the second winding, between the second winding and the third winding, between the third winding and the fourth winding 142, and outside the fourth winding 142. Specifically, the insulating layer 13 is an insulating tape.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the utility model.

Claims (10)

1. A shunt transformer comprising two transformers, each of said transformers comprising: the transformer comprises a framework, a magnetic core arranged on the framework, and a primary winding and a secondary winding wound on the framework;

the primary windings on the two transformers are both copper foils, and a lead is welded between the primary windings on the two transformers; or the primary windings on the two transformers are formed by winding one winding wire.

2. The shunt transformer of claim 1, wherein the bottom of the bobbin extends outward to form a limiting plate, and the limiting plate is provided with a plurality of limiting holes; the limiting hole is arranged at one end, which is not connected with the primary windings of the two transformers, and at the two ends of the secondary winding of each transformer in a penetrating mode.

3. The shunt transformer according to claim 1 or 2, wherein the shunt transformer further comprises a substrate, the two transformers are disposed on the substrate at intervals, the substrate is provided with a via hole, and the ends of the primary windings of the two transformers which are not connected and the two ends of the secondary winding of each transformer are disposed outside the substrate through the via hole.

4. The shunt transformer of claim 3, further comprising an outer-wrapping tape wrapped around the entire outer side of the substrate and the two transformers.

5. The shunt transformer of claim 4, wherein said secondary winding comprises a first winding and a fourth winding, said first winding being connected in parallel with said fourth winding; the first winding, the primary winding and the fourth winding are sequentially wound on the outer side wall of the framework from inside to outside.

6. The shunt transformer of claim 5, wherein said primary winding comprises a second winding and a third winding, said second winding being connected in parallel with said third winding, said third winding being located between said second winding and said fourth winding;

the second windings on the two transformers and the third windings on the two transformers are connected through lead wires, or the second windings on the two transformers and the third windings on the two transformers are respectively formed by winding a winding wire or a copper foil.

7. The shunt transformer of claim 6, wherein an insulating layer is disposed between the bobbin and the first winding, between the first winding and the second winding, between the second winding and the third winding, between the third winding and the fourth winding, and outside the fourth winding.

8. The shunt transformer of claim 7, wherein said magnetic core comprises upper and lower E-shaped magnets; go up the magnet and overlap respectively with lower magnet and locate the first half and the latter half of skeleton, go up the center pillar on magnet and the lower magnet and all arrange in the skeleton.

9. The shunt transformer of claim 8, wherein said first winding and said fourth winding are each formed by winding a lacquered wire.

10. The shunt transformer of claim 9, wherein said insulating layer is an insulating tape.

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