CN110970206A

CN110970206A - Transformer for pulse filter

Info

Publication number: CN110970206A
Application number: CN201811136146.3A
Authority: CN
Inventors: 范云光
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2020-04-07

Abstract

The invention relates to a transformer for a pulse filter, which comprises a base, an iron core, a primary side coil, a secondary side coil, two primary side terminals and at least a secondary side terminal, wherein the iron core is adhered to a groove of a base, is provided with two hollow pipelines and is wound by the primary side coil and the secondary side coil. Each primary side terminal and each secondary side terminal comprises a top section, a middle section and a bottom end, the middle section with the turning section is positioned in the base, and the top section and the bottom end are exposed out of the base. The primary side coil and the secondary side coil are respectively and electrically connected to the top sections of the primary side terminal and the secondary side terminal, and the bottom sections of the primary side terminal and the secondary side terminal are used for being electrically connected to the electric circuit of the printed circuit board. Because of the turning section, the invention is easy to weld and greatly reduces the high-frequency impedance.

Description

Transformer for pulse filter

Technical Field

The invention relates to a transformer for a pulse filter, in particular to a transformer for a pulse filter, which utilizes a primary side terminal and a secondary side terminal comprising a top section, a middle section and a bottom end to be configured on a base, and utilizes a turning section positioned in the middle section in the base to prevent the top section from being too close to an iron core and keep an optimal distance so as to facilitate a primary side coil and a secondary side coil to be electrically connected to the corresponding top sections, improve welding and greatly reduce high-frequency impedance.

Background

In a network pulse transformer, a power inductor is generally required as a primary coil, and the power inductor has desirable characteristics that the larger the current resistance is, the better the current resistance is, and especially in a miniaturized size, the leakage flux can be reduced by improving the current resistance, and the overall electrical operation efficiency can be improved.

Taking the patch transformer with miniaturized size characteristics as an example, the terminals for connection extend outward from the outer side of the body, so the terminals are on the outer side of the body, so that the whole volume includes the body and the terminals, and the space of a Printed Circuit Board (PCB) is occupied. For example, when the body is 10mm and the terminal is 3mm, the whole piece of transformer is 13mm, and the leading-out end of the coil needs to extend outwards and downwards towards the terminal, so that the leading-out part is long, and the welding is time-consuming and labor-consuming.

Therefore, there is a need for an innovative transformer for a pulse filter, which utilizes a primary side terminal and a secondary side terminal including a top section, an intermediate section and a bottom end to be disposed on a base, and prevents the top section from being too close to an iron core to maintain an optimal distance by a turning section located in the intermediate section in the base, and facilitates electrical connection of a primary side coil and a secondary side coil to the corresponding top section, thereby improving welding process and greatly reducing high frequency impedance, so as to solve all the problems of the prior art.

Disclosure of Invention

The present invention provides a transformer for a pulse filter, including a base, an iron core, a primary side coil, a secondary side coil, two primary side terminals and at least a secondary side terminal, wherein the base has electrical insulation and includes a groove, and the iron core is adhered to the groove of the base. The iron core is provided with two hollow pipelines, each hollow pipeline is provided with an outlet hole on the two end faces of the iron core, and the hollow pipelines are wound by the primary side coil and the secondary side coil.

Further, each primary side terminal and each secondary side terminal is similar to an L shape and comprises a top section, a middle section and a bottom end which are connected in sequence, the middle section is located in the base, the top section and the bottom end are exposed out of the base, the top section is close to the outlet hole of the hollow pipeline, particularly, the middle section located in the base is provided with a turning section, and the bottom end is located on the bottom surface of the base by the turning section towards the iron core. In general, all the primary side terminals and all the secondary side terminals are disposed not to exceed the edge of the base, that is, the primary side terminals and the secondary side terminals do not increase the size of the external dimension of the base, so that the occupied space can be reduced, and the application fields requiring light, thin, short and small characteristics can be facilitated.

In addition, the primary side coil and the secondary side coil are top sections electrically connected to the primary side terminal and the secondary side terminal, respectively, and the bottom sections of the primary side terminal and the secondary side terminal are used for electrically connecting to an electrical circuit of a Printed Circuit Board (PCB), such as in a surface mount manner.

Because of the turning section, the top section is not too close to the iron core, the optimal distance can be kept, the bottom end is convenient to align to the contact of the PCB, the welding is easy, and the falling-off is not easy. In addition, the turning section can reduce high-frequency impedance and improve electric quality. Moreover, most of the primary side coil and the secondary side coil are wound inside the hollow pipeline, so that the magnetic leakage can be greatly reduced, and the electric signal intensity can be improved.

The terminal has exposed top and bottom sections, and the middle section is inside the base and has turning section. In addition, the horizontal hollow pipeline just enables the leading-out end of the coil to correspond to and be close to the terminal, so that the coil is easy to connect, easy to weld and difficult to fall off. Moreover, the terminal has a turning section, so that the top of the terminal is not too close to the iron core, and the bottom of the terminal still can just correspond to the contact of the PCB.

In particular, the turns of the terminals can be used to effectively reduce the high frequency impedance, since any discontinuity in the high frequency layout severely affects the electrical transmission characteristics, while sharp-angled turns increase the capacitance per unit length and decrease the inductance per unit length. Therefore, the present invention is particularly designed to solve the above problems.

Drawings

Fig. 1 shows a schematic diagram of a transformer for a pulse filter according to a first embodiment of the present invention.

Fig. 2 shows a schematic diagram of a transformer for a pulse filter according to a second embodiment of the present invention.

Wherein the reference numerals are as follows:

10 base

11 groove

20 iron core

21 hollow pipeline

22 outlet hole

30 primary side coil

40 secondary side coil

50 primary side terminal

60 secondary side terminal

61 top section

62 middle section

62A turning section

63 bottom end

70 Printed Circuit Board (PCB)

71 electric circuit

Detailed Description

The following description of the embodiments of the present invention will be provided in conjunction with the drawings and reference numerals to enable those skilled in the art to make and use the invention.

Referring to fig. 1, a transformer and a circuit diagram of a pulse filter according to a first embodiment of the invention are shown. As shown in fig. 1, the transformer for a pulse filter of the first embodiment of the present invention includes a base 10, an iron core 20, a primary side coil 30, a secondary side coil 40, two primary side terminals 50, and at least a secondary side terminal 60. It is noted that for the convenience of describing the features of the present invention, only a single primary side terminal 50 and a single secondary side terminal 60 are shown in the figures and are provided on the base 10.

Specifically, the base 10 is electrically insulated and includes a groove 11, and the core 20 is engaged with the groove 11 of the base. In addition, the core 20 has two hollow pipes 21 separated from each other, and each hollow pipe 21 has an outlet hole 22 at each end surface of the core 20, and the hollow pipes 21 are wound by the primary side coil 50 and the secondary side coil 60 and are not electrically connected to each other.

Each of the primary side terminal 50 and the secondary side terminal 60 has an L-like appearance and includes a top section, a middle section, and a bottom section which are sequentially connected or integrally formed, and the primary side coil 50 and the secondary side coil 60 are electrically connected to the top sections of the primary side terminal 50 and the secondary side terminal, respectively. Taking the secondary side terminal 60 as an example, the secondary side terminal 60 includes a top section 61, an intermediate section 62 and a bottom end 63, the intermediate section 62 is located in the base 10, and the top section 61 and the bottom end 63 are exposed outside the base 10, wherein the top section 61 is close to the outlet 22 of the hollow tube 21. Further, the bottom end 63 is connected to the middle section 62 at a 90 degree angle of a positive L-shape and is located on the bottom surface of the base 10 toward the core 20.

Further, the bottom end 63 is electrically connected to an electrical trace 71 of a Printed Circuit Board (PCB)70 by soldering, such as Surface Mount Technology (SMT).

Overall, all the primary side terminals 50 and all the secondary side terminals 60 are disposed not to exceed the edge of the base 10, and the portion of the top section 61 does not exceed the top surface of the core 20, wherein the top surface of the core 20 is adhered to one surface of the substrate relative to the core 20, i.e., the primary side terminals 50 and the secondary side terminals 60 do not increase the overall size of the base 11, so that the occupied space can be reduced, which is beneficial to the application field requiring light, thin, short, and small characteristics.

With further reference to fig. 2, a second embodiment of the present invention is a schematic diagram of a transformer for a pulse filter. As shown in fig. 2, the second embodiment of the present invention is similar to the first embodiment and also comprises a base 10, a core 20, a primary side coil 30, a secondary side coil 40, two primary side terminals 50 and at least a secondary side terminal 60, and the main difference therebetween is that the transformer of the second embodiment is that the middle section 62 in the base 11 is specially configured to have a turning section 62A, and the bottom end 63 is located on the bottom surface of the base 10 by the turning section 62A toward the core 20.

In particular, the turning section 62A of the second embodiment substantially comprises at least two turning angles, only an exemplary example of two turning angles is shown, and each of the turning angles is preferably in a range of 30-60 degrees for providing the function of reducing the high frequency impedance, especially preferably 45 degrees, thereby achieving an overall turning of the middle section 62 to the bottom end 63 of 90 degrees, unlike the turning of the middle section 62 to the bottom end 63 by a single 90 degree turning in the direction of the bottom end 63 in the first embodiment. Furthermore, the second embodiment has the specific effects of reducing discontinuity of the electrical circuit layout, reducing capacitance per unit length, and increasing inductance per unit length, thereby effectively reducing high-frequency impedance and improving transmission quality of electrical signals.

In summary, the present invention is characterized in that the primary side terminal and the secondary side terminal including the top section, the middle section and the bottom end are disposed on the base, and the turning section located in the middle section of the base prevents the top section from being too close to the core to maintain an optimal distance to facilitate the bottom end to align with the contact of the PCB, and improves the welding to electrically connect the primary side coil and the secondary side coil to the corresponding top section, and the horizontal hollow pipe just enables the leading-out end of the coil to correspond to and be close to the terminal, so the welding is easy and the coil does not easily fall off. In addition, the whole terminal does not exceed the edge of the base, so that the occupied space can be reduced, and the use efficiency of the PCB is improved.

In addition, the turning section of the middle section of the invention can also reduce high-frequency impedance and improve electrical quality, and especially, most of the primary side coil and the secondary side coil are wound inside the hollow pipeline, thereby greatly reducing magnetic leakage and improving electrical signal intensity.

The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting thereof, since any modification or variation thereof within the spirit of the invention is intended to be covered thereby.

Claims

1. A transformer for a pulse filter to provide power filtering, comprising:

a base having electrical insulation and comprising a groove;

an iron core adhered to the groove of the base and having two separated hollow pipes with an outlet hole on each of two ends of the iron core;

a primary side coil provided with the hollow pipe;

a secondary side coil, provided with the hollow pipe, and not electrically connected with the primary side coil;

at least two primary side terminals disposed on the base; and

at least a secondary side terminal disposed on the base,

the primary side terminal and the secondary side terminal have an appearance similar to an L shape and comprise a top section, a middle section and a bottom end, the middle section is positioned in the base, the top section and the bottom end are exposed out of the base, the top section is close to the outlet hole of the hollow pipeline, the primary side coil and the secondary side coil are respectively and electrically connected to the top sections of the primary side terminal and the secondary side terminal, and the bottom end is electrically connected with an electric circuit of a printed circuit board in a welding mode.

2. The transformer for pulse filter according to claim 1, wherein the soldering is a Surface Mount Technology (SMT).

3. The transformer of claim 1, wherein the primary side terminal and the secondary side terminal are configured not to extend beyond an edge of the base without increasing an overall physical size of the base.

4. The transformer of claim 1, wherein the iron core is engaged with the groove.

5. The transformer for a pulse filter of claim 1, wherein top sections of the primary side terminal and the secondary side terminal do not exceed a top surface of the core.

6. The transformer according to claim 1, wherein the middle section has a turning section, and the bottom end is located on a bottom surface of the base with the turning section facing the core.

7. The transformer according to claim 6, wherein the turning sections comprise at least two bending angles, and each bending angle is between 30-60 degrees.