Patent Application
20180174741
The invention relates to an upright composite common mode coil assembly that facilitates automatic discharging on a production line, reduces the layout area of a circuit board, and facilitates stacking of a plurality of these assemblies; the assembly also has no protruding wires.
Conventionally, a transformer having a common mode choke and a differential mode choke, in operation, receives an AC voltage source, which is passed through the common mode choke and the differential mode choke to a rectifier, and a DC voltage source is outputted. The common mode choke and the differential choke are used to cancel common mode noise and differential mode noise. A reference is made here to a TW Patent Publication No. I341540, titled “Composite Common Mode Coil”, which includes: a base, a coil carrier, and an iron core. The base has two receiving slots and a separating slot located between the two receiving slots. The coil carrier is provided with two bobbins, each having a plurality of coils wound around the outer circumference of the bobbin, and the two bobbins are respectively disposed in the two receiving slots. The iron core has two opposite sides and is positioned in the separating slot with their sides abut against the bobbins. A current is passed through the plurality of coils in each bobbin, resulting in a leakage inductance formed in the bobbin carrier. The magnitude of the leakage inductance can be changed by adjusting the surface area of the sides. However, the coils in this publication are arranged side by side horizontally, so they will occupy a large area on a circuit board when they are actually connected to the circuit board, and as a result of this, the area of the circuit board cannot effectively reduced. Meanwhile, when the coils are in operation, they will produce heat, but due to the horizontal arrangement of the coils, the coil are in proximity to the circuit board, which will not allow air to circulate easily. The poor heat dissipation leads to higher temperature and lower efficiency.
In order to address the issue associated with large-sized transformers, another type of transformer has been proposed, referring to, for example, a TW Patent Publication No. M479500, titled “Vertical Surface-Mounted Transformer”, which includes an iron core, at least two groups of coils, and ferromagnetic colloid surrounding the coils. The iron core includes a top portion, a base portion remote from and opposite to the top portion, and a recessed winding portion connecting the top portion and the base portion. Each of the two groups of coils respectively has at least two end contacts, and is wound around the recessed winding portion. It is characterized in that the top portion is formed with a flat surface to facilitate handling by suction, and the base portion has six bottom electrodes; each of the two end contacts from each group of coils is respectively connected to a bottom electrode. However, in this publication, although the iron core is arranged in an upright position, all the coils are horizontally arranged in parallel as viewed from a horizontal angle. The upright iron core further hinders circulation of air among the groups of coils. The poor heat dissipation leads to higher temperature and lower efficiency or even a burnt device.
In view of the above drawbacks of the conventional techniques, the inventors endeavored to find a solution and have finally come up with the present invention to address the aforementioned shortcomings.
One main objective of the present invention is to provide an upright composite common mode coil assembly that facilitates automatic discharging on a production line.
Another objective of the present invention is to provide an upright composite common mode coil assembly that reduces the layout area of a circuit board on which the assembly is provided.
Still another objective of the present invention is to provide an upright composite common mode coil assembly in which wires will not protrude out of the assembly.
Yet another objective of the present invention is to provide an upright composite common mode coil assembly that increases heat dissipation efficiency by increasing air circulation.
Yet another objective of the present invention is to provide an upright composite common mode coil assembly that facilitates stacking of a plurality of these assemblies.
In order to achieve the above objectives and efficacies, the structure employed by the present invention may include: a coil carrier having two bobbins with a plurality of coils wounded around the outer circumference of each of the bobbins; and a seat for receiving the coil carrier including: a base having a back plate on a surface thereof; a top portion and a bottom portion vertically extending from two sides of the base, respectively; and a separating portion extending from another surface of the base and tapered to form a curved surface. In the base, hollow portions are formed at an upper position and a lower position of the back plate, a wire slot is provided at either side of the back plate, and an indentation extends from one end of each of the wire slots. The bottom portion extends vertically from a side of the base, a recessed portion is formed at each of the four corners of the bottom portion, and a pin is inserted into each of the recessed portions. The top portion extends vertically from another side of the base and includes a flat top face. The separating portion extends from another surface of the base and tapered to form a curved surface, and the separating portion forming a receiving slot with the top portion and another receiving slot with the bottom portion.
As such, one bobbin of the coil carrier is received in each of the receiving slots of the seat, and wires of a group of coils are guided into some of the recessed portions through the wire slots and the indentations, and wires of another group of the coils are guided into the other recessed portions through the notches, so that the wires of the coils do not protrude out of the seat and can be neatly soldered on the pins. Meanwhile, such an assembly facilitates automatic discharging in the production line, reduces layout area of a circuit board on which the assembly is provided, and facilitates stacking of a plurality of these assemblies.
According to the above structure, the coil carrier includes two carrier plates connected through two columns, each of the bobbins includes two semi-bobbins, and the two semi-bobbins combine to surround one of the two columns.
According to the above structure, each of the bobbins of the coil carrier is received in one of the receiving slots of the seat, and the carrier plates are positioned between the top portion and the bottom portion of the seat.
According to the above structure, a surface of the back plate of the base is provided with an insertion slot.
According to the above structure, some of the recessed portions are in communication with the indentations, while the rest of the recessed portions respectively form notches with adjacent regions of the bottom portion.
According to the above structure, a wing portion extends from a side of each indentation, and a concaved portion is formed between each indentation and its corresponding wing portion.
According to the above structure, the wing portions of the indentations near the bottom portion overlie the surfaces of the wires, such that after the wires are passed into the recessed portions, the concaved portions facilitate neat soldering of the wires on the pins.
According to the above structure, insertion holes for holding the pins in place are provided in the respective recessed portions.
The objectives, efficacies and features of the present invention can be more fully understood by referring to the drawing as follows:
With reference to
The seat 4 includes a base 41, a bottom portion 43, a top portion 42 and a separating portion 44, wherein a surface of the base 41 includes a back plate 411. Hollow portions 410 are formed at an upper position and a lower position of the back plate 411. A wire slot 412 is formed at either side of the back plate 411. An indentation 413 extends from one end of each of the wire slots 412. A wing portion 414 extends from a side of the indentation 413. A concaved portion 4131 is formed between the indentation 413 and the wing portion 414. An insert slot 4111 is formed on the surface of the back plate 411.
The bottom portion 43 extends vertically from a side of the base 41 nearer to the indentations 413. A recessed portion 431 is formed at each of the four corners of the bottom portion 43. An insertion hole 4311 is provided inside each of the recessed portion 431. The insertion hole 4311 is inserted with a pin 432. Some of the recessed portions 431 are in communication with the indentations 413. The rest of the recessed portions 431 respectively form notches 433 with adjacent regions of the bottom portion 43.
The top portion 42 extends vertically from another side of the base 41 and includes a flat top face 421.
The separating portion 44 extends from another surface of the base 41 and is tapered to form a curved surface. It forms a receiving slot 40 with the top portion 42 and another receiving slot 40 with the bottom portion 43. A side of each receiving slot 40 is in communication with one of the hollow portion 410.
One bobbin 2 of the coil carrier 1 is received in each of the receiving slots 40 of the seat 4. The carrier plates 11 are positioned between the top portion 42 and the bottom portion 43 of the seat 4. Two sides of the carrier plates 11 tightly fit with the top portion 42 and the bottom portion 43 to form a closed space with the seat 4.
It should be noted that the groups of coils are usually provided in even numbers. In this embodiment, there are two groups of coil, however, the present invention is not limited as such. After each group of the coils are wounded onto a bobbins 2, at least two wires 31 extend out for subsequent connections, as shown in the embodiment with respect to the diagrams of
Moreover, the back plate 411 of the base 41 is provided with the insertion slot 4111. The depth of the insertion slot is at least equal to or slightly less than the height of the portion of the separating portion 44 that is protruding from the top portion 42 and the bottom portion 43. In such a way, a plurality of the present invention can be easily stacked together for assembly and/or transportation. Meanwhile, once the present invention is vertically provided on a circuit board, it does not occupy too much footprint on the circuit board as the areas of the top portion 42 and the bottom portion 43 are smallest (compared to the areas in other directions), such that the area of the circuit board can be effectively reduced. In addition, the back plate 411 of the base 41 are provided with hollow portions 410, which are in communication with the receiving slots 40, thus improving heat dissipation.
In view of this, the upright composite common mode coil assembly of present invention is submitted to be novel and non-obvious and a patent application is hereby filed in accordance with the patent law. It should be noted that the descriptions given above are merely descriptions of preferred embodiments of the present invention, various changes, modifications, variations or equivalents can be made to the invention without departing from the scope or spirit of the invention. It is intended that all such changes, modifications and variations fall within the scope of the following appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 105141588 | Dec 2016 | TW | national |
