CN103680867A - Side-winding type winding transformer and winding method thereof - Google Patents

Abstract

A side-winding type winding transformer and a winding method thereof at least comprise: the left iron core is at least wound with a first winding, and the right iron core is wound with a second winding; the other embodiment comprises a left iron core, a middle iron core and a right iron core which are vertically arranged in parallel, wherein the middle iron core is at least wound with a first winding, and at least one of the left iron core and the right iron core is wound with a second winding; in another embodiment, the middle iron core is wound with a first winding positioned in an inner layer and a second winding positioned in an outer layer, at least one of the left side iron core and the right side iron core is wound with the second winding, and the first winding and the second winding are coils on different secondary sides (primary side or secondary side) respectively; the side edge of one iron core wound with the first winding is provided with the other iron core wound with the second winding to form the side-wound type winding transformer, so that leakage inductance can be adjusted, the heat dissipation effect is good, the space is saved, copper loss and iron loss can be reduced, and the electrical property and the efficiency can be improved.

Description

Side-wound wire-wound transformer and winding method thereof

technical field

The present invention relates to a wire-wound transformer and its winding method, in particular to the structure of an edge-wound wire-wound transformer and its winding method.

Background technique

For power converters (such as computer power supplies or switching power supplies), how to increase power density, reduce size and increase switching frequency (switching frequency) is a concern for power converter designers. Although increasing the switching frequency can reduce the size of transformers and filters, for example, switching loss will adversely affect high-frequency operation. In order to reduce switching loss, resonant switching technology has been proposed.

In general, an LLC resonant power converter includes: a controller with metal-oxide-semiconductor field-effect transistors (MOSFETs), an LLC resonant network, and a rectifier network. The controller switches the two MOSFETs alternately through pulse frequency modulation (PFM), and changes the operating frequency as the load changes to adjust the output voltage Vout. The LLC resonant network includes: two resonant inductors (Lr and Lm) and a resonant capacitor (Cr). The LLC resonant power converter has the characteristics of zero-voltage switching (ZVS) and low voltage stress of the device, and is very suitable for applications requiring high efficiency and high-power power supplies. With the widespread application of LLC resonant power converters, the design of LLC transformers used in LLC resonant power converters has also attracted more and more attention. It is known that the LLC transformer applied to the LLC resonant power converter usually integrates the magnetic components Lr and Lm in a transformer, uses the leakage inductance (leakage inductance) of the transformer as Lr, and uses the magnetic induction (excitation inductance) of the transformer As Lm, the number of magnetic components can be reduced.

Traditional winding transformers have a fixed iron core on which primary (also known as primary) and secondary (also known as secondary) coils are wound. The relationship between the axes is wound on the same iron core, one of which is located in the inner ring and the other is located in the outer ring. The primary and secondary coils are electrically separated and insulated from each other. The winding transformer wound in this way, the primary coil It has a better coupling density with the secondary coil, so it has a smaller leakage inductance. Generally speaking, the magnetic inductance (exciting inductance) of LLC is 3 to 7 times that of the leakage inductance (leakage magnetic inductance), which usually requires a large leakage inductance. In other words, the LLC transformer applied to the LLC resonant power converter The coupling density between the primary and secondary sides of the transformer should be reduced to obtain a larger leakage inductance.

On the other hand, when the traditional winding transformer adopts two inner and outer windings, the coil located in the inner coil will also have the problem of difficult heat dissipation during operation. Therefore, to design an LLC transformer applied to an LLC resonant power converter, it is necessary to focus on designing the leakage inductance and magnetic inductance of the transformer, as well as designing the winding methods of the primary side and the secondary side of the transformer.

Contents of the invention

The invention provides an edge-wound wire-wound transformer and a wire-winding method thereof, which have the advantages of convenient adjustment of leakage inductance, good heat dissipation effect, space saving, reduction of copper loss and iron loss, and improvement of electrical properties and efficiency.

In order to achieve the above effects, the steps of an embodiment of the winding method of the edge-wound transformer of the present invention include:

Prepare a left side iron core and a right side iron core that stand side by side;

Winding at least one first winding around the left iron core;

Winding a second winding around the right side core, the second winding and the first winding are respectively coils on different secondary sides; and

An insulating layer is disposed between the first winding and the second winding.

An embodiment of the winding method of the present invention further includes winding a second winding on the outer layer of the first winding of the left iron core, and providing a winding between the first winding on the inner layer and the second winding on the outer layer. The insulating layer, the second winding wound on the outer layer of the left iron core and the second winding wound on the right iron core may be connected in series or in parallel.

In order to achieve the above effects, the steps of an embodiment of the winding method of the edge-wound transformer of the present invention include:

Prepare a left side iron core, a middle iron core and a right side iron core which stand side by side;

Winding at least one first winding around the middle iron core;

winding a second winding around at least one of the left iron core and the right iron core, the second winding and the first winding being coils of different secondary sides; and

An insulating layer is disposed between the first winding and the second winding.

According to an embodiment of the above-mentioned method of the present invention, wherein the left iron core and the right iron core are respectively wound with second windings, the second windings wound on the left iron core and the right iron core can be connected in series or in parallel with each other Relationship.

According to an embodiment of the above method of the present invention, it further includes winding a second winding on the outer layer of the first winding of the intermediate core, between the first winding on the inner layer and the second winding on the outer layer An insulating layer is provided, wherein the left iron core and the right iron core are respectively wound with the second winding, and the second winding wound on the left iron core, the middle iron core and the right iron core It can be connected in series or in parallel with each other.

According to an embodiment of the above method of the present invention, it further includes winding a second winding on the outer layer of the first winding of the intermediate core, between the first winding on the inner layer and the second winding on the outer layer An insulating layer is provided, wherein the left iron core and the right iron core are respectively wound with the second windings, the second windings wound on the left iron core and the right iron core are connected in parallel and then connected with each other The second winding wound around the middle iron core is connected in series.

An embodiment structure of the side-wound wire-wound transformer proposed by the present invention includes: at least two vertically parallel iron cores, and a first winding and a second winding respectively wound on the two vertically parallel cores , the first winding and the second winding are coils on different secondary sides, and an insulating layer is provided between the first winding and the second winding; Another iron core wound with the second winding is provided to form an edge-wound transformer, thereby achieving the aforementioned effects.

An embodiment structure of the side-wound wire-wound transformer proposed by the present invention includes: a left iron core and a right iron core arranged side by side, the left iron core is at least wound with a first winding, and the right iron core is wound with a first winding. There is a second winding, the first winding and the second winding are coils on different secondary sides, an insulating layer is provided between the first winding and the second winding, and the first and second windings are copper wire, copper foil or enameled wire of any kind.

According to another embodiment of the side-wound wire-wound transformer proposed by the present invention, it comprises: a left iron core and a right iron core arranged side by side, and the left iron core is wound with a first winding located in the inner layer and a first winding located in the outer layer. The second winding of the layer, the iron core on the right side is wound with the second winding, the first winding and the second winding are coils of different secondary sides respectively, and an insulating layer is arranged between the first winding and the second winding.

According to another embodiment of the side-wound wire-wound transformer proposed by the present invention, it includes: three left iron cores, a middle iron core and a right iron core arranged in parallel, the middle iron core is wound with at least the first winding, At least one of the left iron core and the right iron core is wound with a second winding, the first winding and the second winding are respectively coils of different secondary sides, and an insulating layer is provided between the first winding and the second winding .

According to another embodiment of the side-wound wire-wound transformer proposed by the present invention, it includes: three left-side iron cores, a middle iron core and a right-side iron core that are upright and juxtaposed. A winding and a second winding located on the outer layer, at least one of the left iron core and the right iron core is wound with a second winding, the first winding and the second winding are coils on different secondary sides respectively, in the first An insulating layer is provided between the winding and the second winding.

According to an embodiment of the side-wound wire-wound transformer proposed by the present invention, the left iron core and the right iron core are respectively wound with the second winding, and the left iron core and the right iron core are wound with the second winding. The two windings can be connected in series or in parallel with each other.

According to an embodiment of the side-wound wire-wound transformer proposed by the present invention, the left iron core and the right iron core are respectively wound with second windings, which are wound on the left iron core, the right iron core and the middle The second windings of the core are connected in series with each other.

According to an embodiment of the side-wound wire-wound transformer proposed by the present invention, the left iron core and the right iron core are respectively wound with the second winding, and the left iron core and the right iron core are wound with the second winding. The two windings are connected in parallel with each other and then connected in series with the second winding wound around the middle iron core.

Based on the content of the foregoing invention, it can be understood that the side-wound transformer of the present invention constitutes a side-wound transformer by winding the first winding and the second winding respectively on at least two vertical and parallel iron cores. The basic structure of the line transformer, other embodiment changes based on this basic structure, by means of three upright and parallel iron cores, and the change of a single-layer coil or double-layer coil wound on one of the iron cores, and then An edge-wound wire-wound transformer is completed, and the following effects can be obtained.

1. The use of edge-wound structure can reduce iron loss and copper loss, and improve electrical properties and efficiency.

2. Using the side-wound structure, the same wire frame and magnetic core, the power is higher than that of ordinary winding transformers.

3. Using the side-wound structure, there is a large airflow gap between the coils wound on adjacent vertical parallel iron cores, which can improve the heat dissipation effect of the transformer, reduce losses, and increase the utilization rate of the transformer.

4. Using the side-wound structure, the airflow gap between any two adjacent upright parallel iron cores can be adjusted, which has the effect of conveniently adjusting the leakage inductance.

5. Using the side-wound structure, the inductance and leakage inductance can be integrated, which can save the space occupied by the circuit when it is applied to the LLC transformer.

Details about other functions and embodiments of the present invention will be described as follows with reference to the accompanying drawings.

Description of drawings

Fig. 1 is the steps of an embodiment of the winding method of the side-wound wire-wound transformer of the present invention.

FIG. 2 is an embodiment of the present invention, showing a schematic structural view of two vertically juxtaposed left iron cores, right iron cores, a first winding and a second winding.

Fig. 3 is an embodiment of the present invention, showing a schematic view of the structure of two upright side-by-side iron cores on the left side, the right side iron core, the first winding and the second winding, wherein the inner layer of the left iron core is the outer layer of the first winding Layer is the second winding.

Fig. 4 is the steps of another embodiment of the winding method of the side-wound wire-wound transformer of the present invention.

FIG. 5 is an embodiment of the present invention, showing a schematic view of the structure of three vertical and parallel left iron cores, a middle iron core, a right iron core, a first winding and a second winding.

Fig. 6 is an embodiment of the present invention, showing the structure diagram of three upright side-by-side iron cores, the middle iron core, the right iron core, the first winding and the second winding, the inner layer of the middle iron core is the first The outer layer of the winding is the second winding.

Figures 7A to 7B are an embodiment of the present invention, showing a kind of second winding respectively wound on the left iron core and the right iron core in the embodiment with three upright parallel iron cores. Effective circuit diagram.

Fig. 7C to Fig. 7D are an embodiment of the present invention, showing that in the embodiment with three upright and juxtaposed iron cores, the second windings respectively wound on the left iron core, the middle iron core and the right iron core An equivalent circuit diagram of .

Fig. 8 is a structure of an embodiment of the present invention, showing the shape of the components used to form three upright and juxtaposed iron cores and their combination relationship.

Fig. 9 is a combination diagram of the embodiment structure of Fig. 8, showing the completed structure of the components used to form three vertically juxtaposed iron cores.

Fig. 10 is a structure of an embodiment of the present invention, showing the exterior view of the iron core in Fig. 8 after the coil is wound and packaged. Explanation of main component symbols

10C intermediate iron core 40C intermediate winding frame

10L left iron core 40R right winding frame

10R right core 41 eaves

20 insulation layer 42 wiring pins

30A E-type iron core C1 first winding

30B E-type iron core C2 Second winding

40L left winding frame

Detailed ways

A kind of embodiment step of the winding method of the side-wound type wire-wound transformer of the present invention, as shown in Figure 1, comprises:

Prepare a left side iron core and a right side iron core that stand side by side;

Winding at least one first winding around the left iron core;

Winding a second winding around the right side core, the second winding and the first winding are respectively coils on different secondary sides; and

An insulating layer is disposed between the first winding and the second winding.

According to the embodiment of the above-mentioned method, an embodiment structure of the side-wound wire-wound transformer proposed by the present invention, as shown in FIG. The iron core 10L is wound with at least the first winding C1, and the right iron core 10R is wound with the second winding C2, and the first winding C1 and the second winding C2 are respectively coils of different secondary sides (primary side or secondary side), An insulating layer 20 is provided between the first winding C1 and the second winding C2.

An embodiment of the winding method of the present invention further includes winding a second winding C2 on the outer layer of the first winding C1 of the left iron core 10L, the first winding C1 on the inner layer and the second winding on the outer layer An insulating layer 20 is disposed between C2, and the second winding C2 wound on the outer layer of the left iron core 10L and the second winding C2 wound on the right iron core 10R may be connected in series or in parallel.

According to the embodiment of the above method, another embodiment of the side-wound wire-wound transformer structure of the present invention, as shown in FIG. The core 10L is wound with a first winding C1 on the inner layer and a second winding C2 on the outer layer. The right core 10R is wound with a second winding C2. The first winding C1 and the second winding C2 are respectively different secondary windings. The coil (primary side or secondary side), an insulating layer 20 is provided between the first winding C1 and the second winding C2, in other words, if the first winding C1 is the primary side coil of a wire-wound transformer, the second winding C2 is Secondary coils of wound transformers and vice versa.

The steps of another embodiment of the winding method of the edge-wound transformer of the present invention, as shown in Figure 4, include:

Prepare a left side iron core, a middle iron core and a right side iron core which stand side by side;

Winding at least one first winding around the middle iron core;

winding a second winding around at least one of the left iron core and the right iron core, the second winding and the first winding being coils of different secondary sides; and

An insulating layer is disposed between the first winding and the second winding.

According to an embodiment of the above-mentioned method of the present invention, wherein the left iron core and the right iron core are respectively wound with second windings, the second windings wound on the left iron core and the right iron core can be connected in series or in parallel with each other Relationship.

According to an embodiment of the above method of the present invention, it further includes winding a second winding on the outer layer of the first winding of the intermediate core, between the first winding on the inner layer and the second winding on the outer layer An insulating layer is provided, wherein the left iron core and the right iron core are respectively wound with the second winding, and the second winding wound on the left iron core, the middle iron core and the right iron core It can be connected in series or in parallel with each other.

According to an embodiment of the above method of the present invention, it further includes winding a second winding on the outer layer of the first winding of the intermediate core, between the first winding on the inner layer and the second winding on the outer layer An insulating layer is provided, wherein the left iron core and the right iron core are respectively wound with the second windings, the second windings wound on the left iron core and the right iron core are connected in parallel and then connected with each other The second winding wound around the middle iron core is connected in series.

According to the embodiment of the above method, another embodiment of the side-wound wire-wound transformer proposed by the present invention is constructed, as shown in FIG. The side iron core 10R, the middle iron core 10C are wound with at least the first winding C1, at least one of the left iron core 10L and the right iron core 10R is wound with the second winding C2, in other words, one of the embodiments The second winding C2 is only wound on the left iron core 10L, and in another embodiment, the second winding C2 is only wound on the right iron core 10R. In another embodiment, the second winding C2 is wound on the left iron core 10L and the right iron core. The core 10R is wound with a second winding (see Figure 5). The first winding C1 and the second winding C2 are respectively coils of different secondary sides (primary side or secondary side). The first winding C1 and the second winding C2 There is an insulating layer 20 between them, and the first winding C1 or the second winding C2 can be any one of copper wire, copper foil or enameled wire.

According to another embodiment of the edge-wound wire-wound transformer proposed by the present invention, as shown in FIG. The core 10C is wound with a first winding C1 on the inner layer and a second winding C2 on the outer layer, and at least one of the left iron core 10L and the right iron core 10R is wound with the second winding C2, in other words, where One embodiment only winds the second winding C2 on the left iron core 10L, another embodiment only winds the second winding C2 on the right iron core 10R, and another embodiment winds the second winding C2 on the left iron core Both 10L and the right core 10R are wound with a second winding (see Figure 6). The first winding C1 and the second winding C2 are respectively coils on different secondary sides. There is an insulating layer 20, which means that if the first winding C1 is the primary coil of the wire-wound transformer, the second winding C2 is the secondary coil of the wire-wound transformer, and vice versa.

The aforementioned first winding C1 and second winding C2 can be any one of copper wire, copper foil or enameled wire; the first winding C1 and the second winding C2 are coils of different secondary sides, in other words, if the first winding C1 is the primary side coil of the wire-wound transformer, and the second winding C2 is the secondary side coil of the wire-wound transformer. Basically, the number of turns of the first winding C1 and the second winding C2 can be determined according to the specifications and output power of the transformer, and The number of layers wound by any coil on any iron core is not limited to a single layer, and can be a single-layer or multi-layer structure according to the specifications of the transformer.

The aforementioned insulating layer 20 between the first winding C1 and the second winding C2 may be an insulating tape or an insulating component made of other insulating materials, which will be described in detail in conjunction with embodiments below.

The edge-wound wire-wound transformer proposed by the present invention can integrate inductance and leakage inductance into one body, which can save the space occupied by the circuit when it is applied to an LLC transformer. On the other hand, the edge-wound wire-wound transformer proposed by the invention In the embodiment with three left iron cores 10L, middle iron core 10C and right iron core 10R standing side by side, the second winding C2 can also be used in the circuit design of LLC resonant power converters in conjunction with LLC transformers , using a series or parallel electrical connection, different implementations are described below.

In the embodiment with three left iron cores 10L, middle iron core 10C and right iron core 10R standing side by side, an electrical connection mode of the second winding C2 is shown in the equivalent circuit diagram of FIG. 7A , The second winding C2 wound on the left iron core 10L and the right iron core 10R are connected in series; another embodiment of electrical connection is shown in the equivalent circuit diagram of FIG. 7B , wherein the second winding C2 wound on the left iron core 10L and the second winding C2 of the right core 10R are connected in parallel with each other.

In the embodiment with three left iron cores 10L, middle iron core 10C and right iron core 10R standing side by side, when the middle iron core 10C is wound with the first winding C1 on the inner layer and the first winding C1 on the outer layer Two windings C2, wherein an electrical connection of the second winding C2 is shown in the equivalent circuit diagram of FIG. are connected in series with each other; another embodiment of electrical connection is shown in the equivalent circuit diagram of FIG. The second winding C2 of the intermediate core 10C is connected in series.

According to the above-mentioned edge-wound wire-wound transformer of the present invention, taking the embodiment in which there are three upright side-by-side iron cores 10L, a middle iron core 10C and a right-side iron core 10R as an example, a description will be disclosed below with reference to the drawings. A specific structural embodiment is described as follows.

An edge-wound wire-wound transformer as shown in Figure 8 includes:

Two butted E-shaped iron cores 30A and 30B, the material of the iron core can be made of iron oxide material, through the butted two E-shaped iron cores 30A and 30B constitute a left iron core 10L with three upright side by side , the structure of the middle iron core 10C and the right iron core 10R, but not limited to this E-shaped iron core, other such as I-shaped, T-shaped or U-shaped iron cores can also be used.

A winding seat is a plastic molded component, which can be used as the aforementioned insulator 20. The winding seat includes: left winding frame 40L, middle winding frame 40C and right winding frame 40R, left winding frame 40L, The middle bobbin frame 40C and the right bobbin frame 40R are both tube-shaped components, which can be respectively placed on the periphery of the aforementioned left iron core 10L, middle iron core 10C, and right iron core 10R, and can be combined with the E-type Iron cores 30A and 30B form the main structure of an edge-wound wire-wound transformer (see Figure 9), in which the left winding frame 40L, the middle winding frame 40C and the right winding frame 40R can define a winding space, The above-mentioned first winding C1 and second winding C2 can be wound, and a cornice 41 is extended on both sides of the top of the intermediate winding frame 40C, which can prevent the first winding C1 and/or the second winding C2 from falling out, and the middle winding Several wiring pins 42 are provided on both sides of the bottom end of the wire frame 40C. In addition, an insulating layer 20 (insulating tape can be used) can also be provided between the first winding C1 and the second winding C2. Finally, the edge-wound The outer periphery of the wire-wound transformer is covered with an insulating layer 20 (insulating tape can be used), and then a structure as shown in FIG. 10 can be formed.

Although the present invention has been disclosed above through the above-mentioned embodiments, it is not intended to limit the present invention. Any person familiar with the similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of patent protection of the present invention shall be defined by the appended claims of this specification.

Claims (22)

1. limit, around a method for winding for the coiling transformer of formula, is characterized in that, comprising:

Prepare a upright left side iron core and a right side iron core arranged side by side;

At least one the first winding of winding is in this left side iron core;

Winding one second winding is in this right side iron core, and this second winding and this first winding are respectively the not coil of homogeneous side; And

One insulating barrier is set between this first winding and this second winding.

2. limit as claimed in claim 1 is around the method for winding of the coiling transformer of formula, it is characterized in that: the skin that is also included in this first winding of this left side iron core is arranged with one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding, this second winding that is set around outer field this second winding of this left side iron core and is set around this right side iron core is one another in series.

3. limit as claimed in claim 1 is around the method for winding of the coiling transformer of formula, it is characterized in that: the skin that is also included in this first winding of this left side iron core is arranged with one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding, this second winding that is set around outer field this second winding of this left side iron core and is set around this right side iron core is connected in parallel to each other.

4. limit as claimed in claim 1, around the method for winding of the coiling transformer of formula, is characterized in that: this left side iron core and this right side iron core can be any in E type, I type, T-shaped and U-shaped iron core.

5. limit as claimed in claim 1, around the method for winding of the coiling transformer of formula, is characterized in that: this first winding or the second winding are any of copper cash, Copper Foil or enamelled wire.

6. limit, around a method for winding for the coiling transformer of formula, is characterized in that, comprising:

Prepare a upright left side iron core arranged side by side, middle iron core and a right side iron core;

At least one the first winding of winding is in this centre iron core;

At least one in this left side iron core and this right side iron core of winding one second winding, this second winding and this first winding are respectively the not coil of homogeneous side; And

One insulating barrier is set between this first winding and this second winding.

7. limit as claimed in claim 6, around the method for winding of the coiling transformer of formula, is characterized in that: this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is one another in series at this second winding of this left side iron core and this right side iron core.

8. limit as claimed in claim 6, around the method for winding of the coiling transformer of formula, is characterized in that: this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is connected in parallel to each other at this second winding of this left side iron core and this right side iron core.

9. limit as claimed in claim 6 is around the method for winding of the coiling transformer of formula, it is characterized in that: the skin that is also included in this first winding of this centre iron core is arranged with one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding, wherein this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is one another in series at this second winding of this left side iron core, this centre iron core and this right side iron core.

10. limit as claimed in claim 6 is around the method for winding of the coiling transformer of formula, it is characterized in that: the skin that is also included in this first winding of this centre iron core is arranged with one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding, wherein this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is connected in parallel to each other at this second winding of this left side iron core, this centre iron core and this right side iron core.

11. limits as claimed in claim 6 are around the method for winding of the coiling transformer of formula, it is characterized in that: the skin that is also included in this first winding of this centre iron core is arranged with one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding, wherein this left side iron core and this right side iron core are arranged with respectively this second winding, winding this second winding of this left side iron core and this right side iron core be connected in parallel to each other and then with this second windings in series that is set around this centre iron core.

12. 1 kinds of limits are around the coiling transformer of formula, comprise: at least two upright iron cores arranged side by side, and difference winding is at one first winding and one second winding of these two upright iron cores arranged side by side, this first winding and this second winding are respectively the not coil of homogeneous side, between this first winding and this second winding, are provided with an insulating barrier.

13. limits as claimed in claim 12 are around the coiling transformer of formula, it is characterized in that: certain one in two upright these iron cores arranged side by side is arranged with and is positioned at this first winding of internal layer and is positioned at outer field this second winding, another this iron core is arranged with this second winding, and this first winding and this second winding are respectively the not coil of homogeneous side.

14. limits as claimed in claim 12 are around the coiling transformer of formula, it is characterized in that: upright this iron core arranged side by side has three, comprise: iron core and a right side iron core in the middle of a left side iron core,, this centre iron core is at least arranged with this first winding, and at least one in this left side iron core and this right side iron core is arranged with this second winding.

15. limits as claimed in claim 13, around the coiling transformer of formula, is characterized in that: this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is one another in series at this second winding of this left side iron core and this right side iron core.

16. limits as claimed in claim 14, around the coiling transformer of formula, is characterized in that: this left side iron core and this right side iron core are arranged with respectively this second winding, and winding is connected in parallel to each other at this second winding of this left side iron core and this right side iron core.

17. limits as claimed in claim 14 are around the coiling transformer of formula, it is characterized in that: this left side iron core and this right side iron core are arranged with respectively this second winding, this centre iron core is arranged with and is positioned at this first winding of internal layer and is positioned at outer field one second winding, at this first winding of internal layer be provided with an insulating barrier between outer field this second winding.

18. limits as claimed in claim 17, around the coiling transformer of formula, is characterized in that: winding is one another in series at this second winding of this left side iron core, this right side iron core and this centre iron core.

19. limits as claimed in claim 17, around the coiling transformer of formula, is characterized in that: winding is connected in parallel to each other and then and is set around this second windings in series of this centre iron core at this second winding of this left side iron core and this right side iron core.

20. limits as claimed in claim 12, around the coiling transformer of formula, is characterized in that: those iron cores can be any in E type, I type, T-shaped and U-shaped iron core.

21. limits as claimed in claim 12, around the coiling transformer of formula, is characterized in that: this insulating barrier can be insulating tape or the insulation assembly made from other insulating material.

22. limits as claimed in claim 12, around the coiling transformer of formula, is characterized in that: this first winding or the second winding are any of copper cash, Copper Foil or enamelled wire.

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