TWM499636U - Low leakage inductance transformer - Google Patents

Description

Low leakage transformer

This creation is about a transformer, and more specifically, a transformer with a low leakage inductance.

With the high performance and high portability of electronic products such as smart phones, notebook computers or tablet computers, and enabling users to use the electronic products anytime and anywhere, the power supply is processed. Important, and the charger plays a very important role in power supply. It is known that the transformer in the charger is generally composed of a primary coil, a secondary coil and a magnetic core, and an electromagnetic coupling effect is generated between the primary spiral coil and the secondary spiral coil through the magnetic core to achieve voltage conversion processing.

However, in the electromagnetic coupling effect, there is a leakage flux between the primary spiral coil and the secondary spiral coil to generate a leakage inductance, and the leakage inductance is formed by the distributed capacitance in the circuit in which the transformer is disposed and the distributed capacitance of the spiral coil of the transformer. The circuit is oscillated, thus causing electromagnetic interference. Therefore, reducing the leakage inductance of the transformer to reduce the coupling and noise generated by the transformer is a subject that is currently being explored.

In view of the above problems of the prior art, the purpose of the present invention is to provide a low leakage inductance transformer, which reduces the leakage inductance between the primary coil and the secondary coil of the transformer to prevent the leakage inductance and the setting. The distributed capacitance in the circuit of the transformer and the distributed capacitance of the transformer coil constitute an oscillating circuit, thereby avoiding electromagnetic interference.

To achieve the above and other objects, the present invention provides a low leakage inductance transformer comprising: a body for arranging a primary conduction end, a primary conduction end, and a magnetic core, the primary conduction end having a plurality of primary ends a pin, the secondary conductive end has a plurality of secondary terminal pins; a primary coil having two ends connected to the two primary terminal pins of the primary conduction end, respectively, and surrounding the magnetic body in a first predetermined clock direction a first insulating layer covering the primary coil; a leakage inductance adjusting coil comprising: a first adjusting line and a second adjusting line, the first adjusting line is open at one end and the other end is connected to the primary An unconnected primary termination pin of the conductive end, the two ends of the second adjustment line being respectively connected to two unconnected primary termination pins of the primary conduction end, the first adjustment line and the second adjustment line a second predetermined insulating layer that is side by side and opposite to the first predetermined clock direction and wound around the first insulating layer; a second insulating layer covering the leakage inductance adjusting coil; and a primary coil having two ends respectively Connected to the secondary Both the contact pin, and a third predetermined clock a second direction opposite to the predetermined direction around the clock on the second insulating layer; and a third insulating layer covering the coil.

In the above-mentioned low leakage inductance transformer, it is known that "the leakage inductance of the transformer is related to the air gap length of the magnetic core. The longer the air gap length, the smaller the effective magnetic flux rate, and the greater the leakage inductance of the coil". In order to obtain a lower leakage inductance, the parameters of the number of turns of the three sets of coils and the wire diameter of each of the coils are designed as follows: a coil wound around the primary coil on the core in the first predetermined clock direction The number of turns is "92"; the number of turns of the leakage inductance adjusting coil wound around the first insulating layer in the second predetermined clock direction is "46"; and the second insulating layer is wound around the second predetermined clock direction The number of turns of the upper secondary coil is "6"; further, the wire diameter of the primary coil is 0.15 mm; the wire diameter of the first adjustment wire and the second adjustment wire is 0.15 mm; the secondary coil The wire diameter is "0.5mm".

Compared with the prior art, due to the low leakage inductance transformer of the present invention, the primary coil, the leakage inductance adjusting coil and the secondary coil layer and the layer are staggered from each other, and different clock directions are adopted between the two spaced coil layers. The core is wound around the center, thereby canceling the forward and reverse magnetic flux between the gaps of the coils and the gap; in addition, the number of turns for the three sets of coils and the wire diameter of each of the coils are designed according to the aforementioned parameters. Therefore, the leakage inductance between the primary coil and the secondary coil of the existing transformer is reduced. When the low leakage inductance is combined with the stray capacitance of the charging circuit, the common mode noise is also reduced, so the low leakage inductance transformer of the present invention can be matched. Common mode USB noise suppression common mode noise suppression standard EN62684.

1‧‧‧ body

10‧‧‧Primary conduction end

100~104‧‧‧Primary terminal pin

11‧‧‧Secondary conduction end

110,111‧‧‧Secondary terminating feet

12‧‧‧ magnetic core

20‧‧‧Primary coil

200,201‧‧‧

21‧‧‧First adjustment line

210,211‧‧‧

22‧‧‧Second adjustment line

220,221‧‧‧

23‧‧‧Draining adjustment coil

24‧‧‧secondary coil

240,241‧‧‧

30‧‧‧First insulation

31‧‧‧Second insulation

32‧‧‧ Third insulation layer

[Fig. 1] is an exploded view of the components of the transformer for explaining the low leakage inductance of the present invention.

[Fig. 2A] is a view showing the appearance of a seat structure of a transformer having a low leakage inductance.

[Fig. 2B] is a structural view showing the structure of the primary coil of the transformer of the present invention with a low leakage inductance around the base.

[Fig. 2C] is a structural view showing the structure of the first insulating layer covering the primary coil of the transformer of the present invention with low leakage inductance.

[Fig. 2D] is a structural view showing the structure of the leakage inductance adjusting coil of the transformer with low leakage inductance around the first insulating layer.

[Fig. 2E] is a structural external view for explaining a second insulation layer covering leakage inductance adjusting coil of the transformer having low leakage inductance.

[Fig. 2F] is a structural view showing the structure in which the secondary coil of the transformer of the low leakage inductance is wound around the second insulating layer.

[Fig. 2G] is a structural external view for explaining a third insulating layer-coated secondary coil of the transformer of the present low leakage inductance.

The following content will be described in conjunction with the drawings, and the technical contents of the present invention will be described by a specific embodiment. Those skilled in the art can easily understand other advantages and effects of the present invention by the contents disclosed in the present specification. This creation can also be implemented or applied by other different embodiments. The details of the present specification can also be modified and changed without departing from the spirit of the present invention.

Since the transformer must have leakage flux, the leakage inductance of the control transformer is critical to the coupling and noise generated by the transformer. Furthermore, the principle of the transformer is that a varying voltage is applied to the primary coil to produce a varying magnetic field on the magnetic core, thereby exciting the secondary coil to produce a varying electromotive force, thus the voltage of the primary coil, the secondary coil, and the winding of both. There is a proportional relationship between the numbers, and the Ampere circuital theorem shows that the magnetic field strength in the gap area of each coil is related to the leakage flux energy, and the larger the leakage flux energy indicates the effective permeability. The smaller the size, the greater the leakage inductance of the coil. In order to achieve low leakage inductance, the low leakage inductance transformer of this creation adds a leakage inductance adjustment coil between the primary coil and the secondary coil. As shown in Fig. 1, the low leakage inductance transformer includes: a housing 1. The primary coil 20, the first insulating layer 30, the leakage inductance adjusting coil 23, the second insulating layer 31, the second insulating layer 31, the secondary coil 24, and the third insulating layer 32.

As shown in FIG. 2A, the base 1 is configured to dispose a magnetic core 12, and is provided with a primary conductive end 10 having a plurality of primary termination pins (100-104) and a plurality of secondary termination pins (110 and 111) The secondary conducting end 11. It should be noted here that the outer structure of the seat body 1 or the number of the aforementioned pins will be There are different designs depending on the magnitude of the voltage conversion or the use of the voltage conversion, and are not limited to the embodiment.

The primary coil 20 can be wound on the core 12 by using a single-core enameled wire and wound in a counterclockwise direction, and the first end 200 of the primary coil 20 is fixed to the first primary terminal 100 of the primary conductive end 10, The other end 201 is fixed to the second primary terminal 101 of the primary conductive end 10, as shown in FIG. 2B.

The first insulating layer 30 covers the primary coil 20 as shown in FIG. 2C. The first insulating layer 30 is, for example, an insulating tape. In response to the trend of miniaturization of the transformer and high-frequency signal processing, the first insulating layer 30 is used to achieve safety specifications for high-voltage withstand voltage.

The leakage adjustment coil 23 includes a first adjustment line 21 and a second adjustment line 22, and the first adjustment line 21 and the second adjustment line 22 can be a single-core enameled wire, and the first adjustment line 21 and the second adjustment line 22 The first insulating layer 30 is wound in a side-by-side manner and in a clockwise direction opposite to the winding direction of the aforementioned primary coil 20. The second insulating layer 31 is further coated on the periphery of the leakage inductance adjusting coil 23, as shown in FIG. 2E, and is equivalent to the above, thereby achieving safety specifications of high voltage withstand voltage.

The one end 210 of the first adjusting line 21 and the one end 220 of the second adjusting line 22 are both fixed to the fourth primary end leg 103 of the primary conducting end 10, and the other end 221 of the second adjusting line 22 is 221 The fifth primary terminal 104 is then affixed to the primary conductive end 10 as shown in FIG. 2D. The other end 211 of the first adjustment line 21 is vacant and is housed inside the second insulating layer 31.

As can be seen from the above, both the primary coil 20 and the leakage inductance adjusting coil 23 belong to the coil group of the primary conducting end 10, and the third primary terminal 102 of the primary conducting end 10 is in the vacant state.

The secondary coil 24 can be wound around the second insulating layer 31 by, for example, a single-core enamel wire and in a counterclockwise direction opposite to the winding direction of the leakage inductance adjusting coil 23. And one end 240 of the secondary coil 24 is fastened The first secondary terminal 110 is connected to the secondary conductive end 11 and the other end 241 is fixed to the second secondary terminal 111 of the secondary conducting end 11 as shown in FIG. 2F. Specifically, the base 1 of the embodiment has a total of 9 pins, and the primary conductive end 10 has first to fifth pins, that is, corresponding to the first primary terminal 100 shown in FIG. a second primary terminal 101, a third primary terminal 102, a fourth primary terminal 103, and a fifth primary terminal 104, and the secondary conductive terminal 11 has sixth to ninth pins. In this embodiment, the secondary coil 24 only uses the sixth pin (ie, the first secondary terminal 110 corresponding to FIG. 1) and the ninth pin (ie, the second secondary termination corresponding to FIG. 1). Feet 111).

Similarly, in order to achieve the safety specification of high voltage withstand voltage, the third insulating layer 32 covers the secondary coil 24, as shown in FIG. 2G, and the third insulating layer may be an insulating tape.

It is to be noted that the primary coil 20, the leakage inductance adjusting coil 23, and the secondary coil 24 in the low leakage inductance transformer are not limited to be wound around the magnetic core 12 in the clock mode of the above embodiment. Specifically, the three sets of coils of the primary coil 20, the leakage inductance adjusting coil 23 and the secondary coil 24 are wound around the core 12 in different clock directions between the two separated coil layers. The positive magnetic and the reverse magnetic mutually cancel each other, thereby reducing magnetic flux leakage and leakage inductance.

In addition, it is more particularly emphasized that the transformer of the present invention is designed to obtain a lower leakage inductance, and the parameters of the number of turns of the three sets of coils and the wire diameters of the single-core enameled wires used in the coils are designed. Specifically, in the present embodiment, the number of turns of the primary coil 20 connected to the primary end pin of the primary conductive end 10 is "92", and the wire in the single-core enameled wire used in the primary coil 20 The wire diameter is "0.15 mm"; in the leakage inductance adjusting coil 23 connected to the primary end pin of the primary conducting end 10, the number of turns of each of the first adjusting wire 21 and the second adjusting wire 22 which are arranged side by side "23", and the wire diameter of the single-core enameled wire used in the first adjustment line 21 and the second adjustment line 22 It is "0.15 mm"; the number of turns of the secondary coil 24 connected to the secondary end of the secondary conductive end 11 is "6", and the secondary coil 24 is used in the single-core enameled wire. The wire diameter is "0.5mm".

Table 1 below shows the high-voltage withstand voltage (Hi-pot) test results of the above-mentioned low leakage inductance transformer, and the test parameters of the high-voltage withstand voltage test are performed at AC60Hz; 5mA.

It can be seen from the above that the low leakage inductance transformer of the present invention can effectively suppress the leakage magnetic flux existing between the coils, thereby greatly reducing the leakage inductance existing between the coils and preventing the electromagnetic energy radiated outward. Electromagnetic interference, the low leakage inductance transformer created by the present invention can be applied to a charging device of an electronic device with a capacitive touch panel, such as a smart phone or a tablet computer, especially the low leakage of the present invention. The sense transformer can also conform to the common mode noise suppression standard EN62684 of the universal micro USB charger. When the user is operating the electronic device with the capacitive touch panel in charging, the touch operation can be accurately performed. There will be no mistakes.

The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone who is familiar with the technology can do so without violating the spirit and scope of this creation. The examples are modified and altered. Therefore, the scope of protection of this creation shall be as listed in the scope of patent application for this creation.

1‧‧‧ body

10‧‧‧Primary conduction end

100~104‧‧‧Primary terminal pin

11‧‧‧Secondary conduction end

110,111‧‧‧Secondary terminating feet

12‧‧‧ magnetic core

20‧‧‧Primary coil

200,201‧‧‧

21‧‧‧First adjustment line

210,211‧‧‧

22‧‧‧Second adjustment line

220,221‧‧‧

23‧‧‧Draining adjustment coil

24‧‧‧secondary coil

240,241‧‧‧

30‧‧‧First insulation

31‧‧‧Second insulation

32‧‧‧ Third insulation layer

Claims (8)

A low leakage inductance transformer includes: a body for arranging a primary conduction end, a primary conduction end, and a magnetic core, the primary conduction end having a plurality of primary termination pins, the secondary conduction end having a plurality of a secondary winding leg; two ends of which are respectively connected to the two primary terminal pins of the primary conduction end, and wound around the magnetic core in a first predetermined clock direction; the first insulating layer is covered The primary coil; a leakage inductance adjusting coil, comprising: a first adjusting line and a second adjusting line, the first adjusting line is vacant at one end, and the other end is connected to an unconnected primary end of the primary conducting end a pin, the two ends of the second adjusting line are respectively connected to the two unconnected primary end pins of the primary conducting end, the first adjusting line and the second adjusting line are side by side and in the first predetermined clock direction a second predetermined predetermined clock direction and wound around the first insulating layer; a second insulating layer covering the leakage inductance adjusting coil; a secondary coil having two ends connected to the secondary terminal pin Person, and a third predetermined clock a second direction opposite to the predetermined direction around the clock on the second insulating layer; and a third insulating layer covering the coil. The low leakage inductance transformer according to claim 1, wherein the wire of the primary coil, the first adjustment line of the leakage inductance adjustment coil, and the wire of the second adjustment line and the secondary coil are single core. Enameled wire. The low leakage inductance transformer according to claim 1, wherein the first insulating layer, the second insulating layer and the third insulating layer are insulating tapes. The low leakage inductance transformer of claim 1, wherein the number of turns of the primary coil wound around the core in the first predetermined clock direction is "92"; and the second predetermined clock direction The number of turns of the leakage inductance adjusting coil wound around the first insulating layer is "46"; the number of turns of the secondary winding wound around the second insulating layer in the third predetermined clock direction is "6". The low leakage inductance transformer according to claim 1 or 4, wherein the primary coil has a wire diameter of "0.15 mm"; and the first adjustment wire and the second adjustment wire have a wire diameter of "0.15". Mm"; the wire diameter of the secondary coil is "0.5 mm". The low leakage inductance transformer according to claim 1, wherein one end of the first adjustment line that is vacant is received in the second insulation layer. The low leakage inductance transformer of claim 1, wherein the second predetermined clock direction is a clockwise direction, and the third predetermined clock direction is a reverse direction. Clock direction. The low leakage inductance transformer of claim 1, wherein when the first predetermined clock direction is a clockwise direction, the second predetermined clock direction is an inverse clock direction, and the third predetermined clock direction is a smooth Clock direction.