TWM499635U - Surface mount transformer with ceramic insulation composite base - Google Patents

Description

Surface mount transformer with ceramic insulated composite pedestal

A surface mount transformer, especially a surface mount transformer having a ceramic insulated composite pedestal.

As an electronic component, a transformer is a device that raises or lowers the voltage by applying Faraday's law of electromagnetic induction. It usually contains two or more sets of coils, and has multiple functions such as adjusting the voltage of the AC power, changing the impedance, and dividing the circuit. Transformers are often used in electronic circuits. Especially in Ethernet devices, between the PHY chip (the device that operates the open system interconnect communication reference model physical layer) and the RJ45 connector, network transformers are often used to provide signal transmission, impedance matching, and waveforms. Repair, signal clutter suppression and voltage isolation.

After assembling the network transformer between the interface of the PHY chip and the RJ45 connector, the Ethernet device has the functions of signal potential coupling and isolation of external interference, and can achieve impedance matching with the PHY chip of other external networks. Isolating the PHY chip from the outside, enhancing the anti-jamming capability and improving the stability of the connection. Of course, many of the current network transformers are directly integrated into the RJ45 connector, which not only simplifies the production process, saves product design space, but also improves product yield.

Furthermore, in the past production process, the core of the network transformer was made of nickel-zinc ferrite, but the magnetic permeability of nickel-zinc ferrite (about 800Hm ^-1 ) was much lower than that of manganese-zinc ferrite. , the number of turns of the coil wound around the iron core can not be reduced, the volume of the iron core will also increase, not only will occupy the space of the product, and when the volume of the iron core is enlarged, the amount of the ferromagnetic colloid is also bound to increase. Part of the magnetic permeability is much lower than that of the iron core, so that the overall magnetic resistance is increased upwards. Especially when the number of turns of the coil is large, the energy loss caused by the coil impedance is also increased, so that the performance of the overall component is not good.

On the other hand, although the magnetic permeability of Mn-Zn ferrite is larger than that of nickel-zinc ferrite, the core made of Mn-Zn ferrite is affected by the material properties of Mn-Zn ferrite itself when surface-mounted. The insulation resistance of the wire and the Mn-Zn ferrite is increased relative to the nickel-zinc ferrite, so that the probability of short-circuit between the two ends of the core is increased, which affects the yield of the product, which undoubtedly causes the manufacturer to fall into a dilemma.

The present invention attempts to provide a surface mount transformer having a ceramic insulated composite pedestal. The iron core made of manganese-zinc ferrite is insulated by the insulating base, so that the probability of short-circuiting the iron core is reduced, and the transmission rate of the network transformer is stabilized. Limiting the distance between the bottom conductive electrodes of the insulating base to meet the conventional limit of 3 db loss, while providing a flat surface that can be adsorbed and moved, reducing the time required for installation and improving product yield. Through the technology of this case, in order to meet the design constraints of today's equipment, light and short, and reduce the installation space occupied by the circuit board, and reduce the number of turns of the coil by effectively increasing the magnetic permeability, the efficiency of the transformer is improved.

One of the objects of the present invention is to provide a surface-mounted transformer having a ceramic insulated composite pedestal, which can change the iron core made of the past nickel-zinc ferrite into a Mn-Zn ferrite, which can reduce the number of turns of the coil and reduce the iron in a limited space. The amount of magnetic glue maintains the magnetic permeability of the transformer and improves overall efficiency.

Another object of the present invention is to provide a surface having a ceramic insulating composite pedestal The transformer is installed, and the iron core made of manganese-zinc ferrite is combined with the insulating base to reduce the probability of short-circuiting of the iron core.

A further object of the present invention is to provide a surface mount transformer having a ceramic insulated composite pedestal, which increases the distance between the bottom conductive electrodes of the insulating pedestal, so that the network transformer conforms to the conventional limit of 3 db loss, and stabilizes the network transformer. Transmission rate.

Another object of the present invention is to provide a flat surface directly, simplifying the product structure and facilitating the use of surface mounting technology to improve manufacturing efficiency.

In order to achieve the above object, the present invention provides a surface mount transformer having a ceramic insulated composite pedestal for being disposed on a circuit board, the surface mount transformer comprising: an insulating base comprising a base body extending along a long direction The base body has a bottom surface and a joint surface opposite to the bottom surface; and two limiting portions respectively formed on the opposite ends of the base body along the long direction, each of the limiting portions respectively having an extended protrusion a mounting surface of the bottom surface, and a bottom guiding electrode respectively formed at each end of each of the mounting surfaces; a core coupled to the bonding surface, comprising a top portion formed with a flat adsorption surface for adsorption removal; a winding portion extending from the top portion and coupled to the bonding surface; and two side walls opposite to each other and commonly connecting the top portion and the winding portion, and the sidewall is surrounded by the top portion and the winding portion a winding channel; and at least two coils, each of the coils having at least two end contacts, each of the end contacts being respectively connected to Conductively connected to said bottom electrode, and each of the coils are wound around the base body and the winding wire portion via the channel.

A surface-mounted transformer with a ceramic insulated composite pedestal disclosed in the present invention directly designes the top portion as a flat adsorption surface for surface mounting without additional structure, thereby simplifying the design; The magnetic permeability of the iron core, Therefore, the number of turns of the coil can be reduced in a limited space, which not only reduces the occupied space, but also reduces the amount of ferromagnetic glue, and avoids energy loss and improves the overall performance; and the iron core is combined with an insulating base to avoid the occurrence of climbing of the iron core. The condition reduces the probability of the core being short-circuited; it can also increase the distance between the bottom conductive electrodes of the insulating base, so that the network transformer meets the conventional limit of 3db loss and stabilizes the transmission rate of the network transformer.

1‧‧‧Surface mounted transformer

2‧‧‧Insulated base

20‧‧‧Long

22, 22’‧‧‧Base body

24‧‧‧ bottom

26‧‧‧ joint surface

3‧‧‧Limited Department

32‧‧‧Installation surface

322‧‧‧Bottom conductive electrode

4‧‧‧ iron core

40‧‧‧Windway

42‧‧‧Winding Department

44‧‧‧ top

442‧‧‧flat adsorption surface

46‧‧‧ side wall

5‧‧‧section

52‧‧‧Set up

522‧‧‧Bottom ground electrode

6‧‧‧Two coils

62‧‧‧End joints

7‧‧‧Protective layer

8‧‧‧ boards

1 is a bottom perspective view of the insulating base portion of the first preferred embodiment of the present invention, illustrating the structurally related positions of the base body, the limiting portion, and the partition; FIG. 2 is an insulating base of the first preferred embodiment. FIG. 3 is a side view of the core of the first preferred embodiment of the present invention, illustrating that the winding passage is formed by the side wall, the top portion and the winding portion; FIG. 4 is the first embodiment. A schematic cross-sectional side view of a surface mount transformer according to a preferred embodiment, illustrating a combination relationship of a coil wound around a base body and a winding portion via a winding passage, and the transformer is mounted on the circuit board; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a perspective view showing the outer portion of the surface mount transformer of the second preferred embodiment of the present invention. FIG. 6 is a perspective view of the insulating base of the surface mount transformer of the second preferred embodiment of the present invention. The implementation of the seat.

The foregoing and other technical aspects, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments illustrated in the accompanying drawings. In the embodiments, the same elements will be similar. The label indicates.

The first preferred embodiment of the surface mount transformer having a ceramic insulated composite pedestal, as shown in FIG. 1 to FIG. 5 together, the surface mount transformer 1 has an insulating base 2 made of ceramic material, which is viewed from the side. The insulating base 2 is a mountain. For convenience of explanation, the insulating base 2 is defined herein to have a base body 22 extending along the longitudinal direction 20 and two sides of the base body 22 in the direction of the longitudinal direction 20. The opposite end of the limiting portion 3, and the base body 22 includes a bottom surface 24 and a bonding surface 26 opposite to the bottom surface 24.

In this example, each of the limiting portions 3 has a mounting surface 32 extending upwardly from the upper surface of the drawing, and a silver layer is respectively disposed on both ends of each mounting surface 32. The silver layer of this example is silver. After the glue is formed, the insulating base 2 is heated to solidify the silver layer, and then the insulating base 2 is plated, and the material which is not conductive by the ceramic material is passed, so that the electrolyte to be plated and containing nickel ions can only be adhered. A layer of nickel is formed on the silver layer, and after drying and solidifying, a layer of tin is adhered to the nickel layer by electroplating, and the silver layer, the nickel layer and the tin layer are adhered to each other on the mounting surface 32. The bottom via electrode 322 in this example is formed. Of course, those skilled in the art can easily infer that although in this example, the plating is performed by means of silver paste, the bottom conductive electrode in this example is formed by sputtering or the like, and the implementation is not affected. Example implementation.

The surface mount transformer 1 in this example further includes a compartment 5 which is equally spaced from each other and is parallel to the length of the longitudinal direction 20 is exemplified as 1.5 mm, and the structure of the partition 5 is completely Like the limiting portion 3, there is an assembly surface 52 extending from the convex bottom surface 24 and a bottom ground electrode 522 formed at both ends of the assembly surface 52. The bottom ground electrode 522 and the bottom conductive electrode 322 are fabricated in the same manner. The description is not repeated; on the other hand, the bottom ground electrodes 522 adjacent to each other are at least 1.5 apart from each other via the arrangement of the partitions 5. Mm, so that the surface mount transformer 1 can meet the conventional limit of the network transformer 3db loss, stabilize the transmission rate, and increase the distance between the bottom conductive electrodes 322, thereby preventing the probability of flashover when a large voltage is applied.

Then, a layer of epoxy resin is applied to the bonding surface 26 of the insulating base 2, and the core 4 made of MnZn ferrite is placed on the bonding surface 26. In this example, the magnetic permeability of the core 4 is The example is 5000Hm ^-1 . The winding portion 42 of the iron core 4 extends from the top portion 44 and is bonded to the bonding surface 26 through the epoxy resin colloid. The winding portion 42 and the top portion 44 of the core 4 are composed of two in the long direction 20 The side walls 46 that are opposite to each other are connected in common, and the winding portion 42, the top portion 44, and the side walls 46 surround each other with a winding passage 40 that allows the two coils 6 to pass through to the base body 22 and the winding portion 42. Therefore, the core 4 will be like a letter when viewed from the side.

The two coils 6 have two end contacts 62 extending upwardly to different bottom conductive electrodes 322 respectively, and are respectively connected to the positive and negative electrodes on the circuit board 8 when surface mounting is performed; on the other hand, the top 44 is further A flat adsorption surface 442 is formed to facilitate the adsorption and removal of the nozzle of the robot arm when the surface is mounted to the circuit board 8. Further, the winding portion 42 of the core 4 has a width equivalent to that of the base body 22 in the width direction perpendicular to the longitudinal direction 20, so that the two coils 6 are not wound around the winding portion 42 and the base body 22, respectively. The magnetic permeability of the surface mount transformer 1 is affected by the gap generated by the difference in width; in contrast, the top portion 44 is larger than the width of the winding portion 42 in the width direction perpendicular to the long direction 20, so that the two coils 6 After the winding portion 42 is wound, the structure of the two coils 6 is not damaged by exceeding the outer surface of the surface mount transformer 1, and the product yield is improved. Of course, it will be understood by those skilled in the art that even if the two coils in this example are changed to four coils, the two end contacts are changed to six end contacts, which do not affect. The implementation of the technology in this case.

The surface mount transformer 1 is then re-aligned so that the top 44 of the core 4 is above the illustration and the insulating base 2 is below the illustration, and the protective layer 7 is illustrated as a ferromagnetic gel, covering the two coils. 6 is tangential to the top portion 44 and the outer surface of the base body 22, and isolates the two coils 6 from the external air to be oxidized, and the connection to the bottom conductive electrode 322 is melted by reflow. It is firmly bonded to the positive and negative pads (not labeled) on the circuit board 8. Among them, the ferromagnetic colloid is made of a magnetic material (iron, cobalt, and nickel) mixed in a resin glue, so that the rubber contains a certain density of ferromagnetic metal powder, or a non-conductive ceramic such as an oxide or nitride of these metals. powder. Of course, since the resin material is not magnetically permeable, the magnetic resistance of the ferromagnetic gel can only outperform the air and is still not as good as the core material.

When the two coils 6 are energized to generate a magnetic field, the iron core 4 is induced to increase the magnetic flux density, and the magnetic lines of force pass through the winding portion 42 and the top portion 44 to form a smooth closed magnetic circuit, since the present invention maintains the surface mount transformer 1 guide. At the magnetic rate, the better magnetic permeability of the MnZn ferrite than the nickel-zinc ferrite does not require the longer core 4 to be reduced, thereby reducing the number of winding turns, which corresponds to the length of the core 4. The length of the ferromagnetic gel is reduced, thereby greatly reducing the magnetic resistance during the road and further improving the magnetic permeability. Although the aforementioned ferromagnetic colloid can reduce the magnetic resistance, the structure which is elongated by the front case will affect the magnetic permeability of the surface mount transformer 1 to be lowered.

With the above structure, a flat adsorption surface for the robot arm to be adsorbed and moved is formed on the top of the iron core, and the manufacturing time is accelerated by the surface adhesion technology, and the production yield is increased with the automatic configuration, and no additional structure is required. This simplifies the design and reduces the space occupation. On the other hand, the magnetic permeability of the iron core is improved by material selection, so that the number of turns of the coil can be reduced in a limited space, which not only reduces the space occupied, but also reduces the amount of ferromagnetic glue, and avoids Energy loss The overall efficiency is improved by the consumption; the iron core is combined with the insulating base to reduce the probability of short-circuiting of the iron core; and the distance between the bottom conductive electrodes of the insulating base can be increased, so that the network transformer meets the conventional limit of 3db loss , stabilize the transmission rate of the network transformer.

In the second embodiment of the present invention, please refer to FIG. 6. The surface-mounted transformer (not labeled) according to the previous embodiment can remove the partition, so that the two coils (not shown) have a large winding space and are complete. Wound around the base body 22', once it is necessary to additionally strengthen the magnetic permeability of the surface-mounted transformer in this example, only increasing the number of turns of the coil wound by the two coils can achieve the reinforcing effect, and there is no need to worry that the increase in the number of turns of the coil exceeds the surface. The appearance of the transformer is installed, and the overall design structure change is added, which can effectively improve the yield and flexibility of the product.

However, the above is only the preferred embodiment of the present invention, and the scope of the novel implementation cannot be limited thereto. Any simple equivalent changes and modifications made according to the scope of the novel application and the contents of the new specification should be It is still within the scope of this new patent.

2‧‧‧Insulated base

22‧‧‧Base body

24‧‧‧ bottom

26‧‧‧ joint surface

3‧‧‧Limited Department

32‧‧‧Installation surface

322‧‧‧Bottom conductive electrode

4‧‧‧ iron core

42‧‧‧Winding Department

44‧‧‧ top

46‧‧‧ side wall

5‧‧‧section

52‧‧‧Set up

522‧‧‧Bottom ground electrode

Claims (9)

A surface mount transformer having a ceramic insulated composite pedestal for being disposed on a circuit board, the surface mount transformer comprising: an insulating base comprising a base body extending along a long direction, the base body having a a bottom surface and a joint surface opposite to the bottom surface; and two limiting portions respectively formed on the opposite ends of the base body along the longitudinal direction, each of the limiting portions respectively having a mounting surface extending from the bottom surface, and A bottom guiding electrode is respectively formed at each end of each of the foregoing mounting faces; a core coupled to the bonding surface includes a top portion formed with a flat adsorption surface for adsorption removal; and an extension from the top portion for bonding a winding portion to the bonding surface; and two sidewalls opposite to each other and commonly connecting the top portion and the winding portion, and the sidewall is surrounded by the winding portion and the winding portion; and at least two Each of the coils has at least two end contacts, and each of the end contacts is respectively connected to the bottom conductive electrode, and each The coils are wound around the base body and the winding wire portion via the channel. A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein the winding portion has the same width as the base body in a width direction perpendicular to the long direction, and the top portion is perpendicular to The width direction of the long direction has a width larger than that of the winding portion. A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein the core has a magnetic permeability greater than 800 Hz ^-1 . A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein each of said front bottom conducting electrodes is spaced apart from said adjacent bottom conducting electrode by at least 1.5 mm. A surface mount transformer having a ceramic insulated composite pedestal according to claim 4, further comprising a partition formed on the base body, having an assembly surface extending from the bottom surface, and each of the foregoing A grounding electrode is formed at each end of the set surface. A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein the insulating base is a ceramic pedestal. A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein the iron core is a manganese zinc ferrite. A surface mount transformer having a ceramic insulated composite pedestal of claim 1 further comprising a protective layer covering each of said coils and tangential to the top and the outer contour of each of said base bodies. A surface mount transformer having a ceramic insulated composite pedestal according to claim 1, wherein each of the bottom conductive electrodes includes a silver layer disposed on the mounting surface, a nickel layer attached to the silver layer, and a The tin layer of the above nickel layer.