CN110164665A - A kind of high frequency transformer - Google Patents

Abstract

The invention discloses a high-frequency transformer, which comprises a conductive casing, and a through hole is arranged on the conductive casing, and a plurality of annular magnetic cores separated by insulating partitions are inserted in the through hole, and each annular magnetic core has a It is wound with primary windings, several primary windings are connected in parallel, and also includes conductive stems inserted into several annular magnetic cores. The conductive stems include upper stems and lower stems separated by insulating baffles. One end of the upper stem is the first terminal for connecting wires, the other end of the upper stem is connected to the conductive shell; one end of the lower stem is the second terminal for connecting wires, and the other end of the lower stem is connected to For the conductive shell, the first terminal and the second terminal are located on two sides of the conductive shell. Through multiple groups of primary windings connected in parallel to exchange voltage with the secondary windings through the electromagnetic mutual inductance effect, when the number of turns of the secondary winding is fixed at one turn and the number of turns of the primary winding is not reduced, it can be used The output voltage of the secondary winding is multiplied.

Description

A high frequency transformer

technical field

The present invention relates to the technical field of variable voltage interaction, and more specifically, relates to a high-frequency transformer.

Background technique

At present, there are two types of high-frequency transformers used in high-frequency switching power supplies. The first type is composed of two halves of aluminum processing parts to form the secondary winding of the transformer, and only one transformer core and the original transformer are placed in one transformer. side winding. The second type uses two cylindrical thin-walled copper parts to fit together, solder many conductive pins on one of the copper parts, pass through the insulating layer and the first layer of copper plate and connect with the outermost layer of copper plate by soldering.

There are two problems in the production of high-frequency transformers in the existing way. One is: according to the principle that the voltage of the transformer is proportional to the number of turns, the number of turns on the secondary side of the transformer must be increased, or the number of turns on the primary side must be increased to increase the output voltage. Limited by the transformer core (the power of a single core is limited) and the primary winding process, the number of turns on the primary side cannot be reduced too low, and the number of turns on the secondary side of the transformer is fixed at 1 turn, so the DC output voltage of a single high-frequency transformer It cannot be made very large, generally within 20V. The second is that the auxiliary side of the transformer is made by a numerical control machining center or soldered, which has low efficiency and high cost, and is not convenient for large-scale production.

Therefore, how to solve the problem that the output voltage of the high-frequency transformer is low and the cost is too high to be mass-produced is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide a high frequency transformer with high output voltage, simple structure and easy mass production.

In order to achieve the above object, the present invention provides the following technical solutions:

A high-frequency transformer, comprising a conductive casing, the conductive casing is provided with a through hole, and a plurality of ring-shaped magnetic cores separated by insulating partitions are inserted in the through-hole, each of the ring-shaped magnetic cores There are primary windings wound on them, and several of the primary windings are connected in parallel, and also include conductive core posts inserted in several of the annular magnetic cores, and the conductive core posts include An upper stem and a lower stem, one end of the upper stem is the first terminal for connecting wires, the other end of the upper stem is connected to the conductive shell; one end of the lower stem is for As for the second terminal of the connecting wire, the other end of the lower stem is connected to the conductive shell, and the first terminal and the second terminal are located on two sides of the conductive shell.

Preferably, the conductive housing is a rectangular parallelepiped housing, and the through hole is a cylindrical through hole penetrating along the length direction of the rectangular parallelepiped housing.

Preferably, the annular magnetic core is a circular magnetic core, and both the upper stem and the lower stem are semi-cylindrical stems.

Preferably, the upper stem and the lower stem are copper rods or aluminum rods.

Preferably, the side wall of the conductive housing is provided with a rectangular opening for leading out the wires on the primary winding and pouring potting compound.

Preferably, the conductive shell is an aluminum alloy shell.

Preferably, both sides of the conductive shell are provided with conductive end caps, and the two conductive end caps are connected to the upper stem and the lower stem respectively, and the two conductive end caps are respectively corresponding to There is an opening through which the first terminal and the second terminal pass through, and the first terminal and the second terminal respectively pass through the opening and are kept insulated from the conductive end cover .

Preferably, the upper stem and the lower stem have the same length, and the lengths of the upper stem and the lower stem are 20 to 40 mm longer than the length of the through hole.

Preferably, the conductive shell, the upper stem and the lower stem are all connected and fixed to the conductive end cap by screws.

Preferably, the conductive end cap is a copper plate.

The high-frequency transformer provided by the present invention includes a conductive casing, and a through hole is arranged on the conductive casing, and a plurality of ring-shaped magnetic cores separated by insulating partitions are inserted in the through-hole, and each ring-shaped magnetic core is wound There are primary windings, and several primary windings are connected in parallel. It also includes conductive stems inserted in several annular magnetic cores. The conductive stems include upper and lower stems separated by insulating baffles. One end of the stem is the first terminal for connecting wires, the other end of the upper stem is connected to the conductive shell; one end of the lower stem is the second terminal for connecting wires, and the other end of the lower stem is connected to the In the conductive shell, the first terminal and the second terminal are located on two sides of the conductive shell.

Therefore, in the high-frequency transformer provided by the present invention, through multiple sets of parallel-connected primary windings and the secondary winding at the same time through the electromagnetic mutual inductance effect of voltage exchange, the number of turns in the secondary winding is fixed to one turn and the primary winding When the number of turns is not reduced, the output voltage of the secondary winding can be doubled, which can significantly increase the output voltage of the high-frequency transformer. Since the length of the high-frequency transformer can be adjusted according to needs, 3 to 5 or even More toroidal cores and primary windings enable the output voltage of a single high-frequency transformer to reach 75V or even higher. In addition, the present invention fixes the annular magnetic cores side by side in the through holes of the conductive shell, and the conductive core posts are pierced in the annular magnetic cores, and the conductive core posts are electrically connected with the conductive shell to serve as secondary windings, so that the overall structure is simple. And it is easy to process, low in cost and convenient for mass production.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the explosion diagram of the specific embodiment of high-frequency transformer provided by the present invention;

Fig. 2 is the sectional view of the specific embodiment of high-frequency transformer provided by the present invention;

Fig. 3 is a circuit diagram of a specific embodiment of a high-frequency transformer provided by the present invention.

Among them, 1-conductive end cap, 2-opening, 3-ring core, 4-insulation partition, 5-primary winding, 6-upper stem, 7-lower stem, 8-insulation baffle, 9 - through hole, 10 - conductive shell, 11 - rectangular opening, 12 - screw, 13 - first terminal, 14 - second terminal.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The core of the invention is to provide a high-frequency transformer with high output voltage, simple structure and easy mass production.

Please refer to Fig. 1 to Fig. 3, Fig. 1 is the explosion diagram of the specific embodiment of the high-frequency transformer provided by the present invention; Fig. 2 is the sectional view of the specific embodiment of the high-frequency transformer provided by the present invention; Fig. 3 is the high-frequency transformer provided by the present invention The circuit diagram of the specific embodiment of frequency transformer.

The high-frequency transformer provided by the present invention includes a conductive shell 10, and a through hole 9 is arranged on the conductive shell 10, and a plurality of annular magnetic cores 3 separated by insulating partitions 4 are inserted in the through hole 9, and each ring The primary windings 5 are all wound on the magnetic cores 3, and several primary windings 5 are connected in parallel, and also include conductive core posts inserted in several annular magnetic cores 3, and the conductive core posts are separated by insulating baffles 8. Open upper stem 6 and lower stem 7, one end of the upper stem 6 is the first terminal 13 for connecting wires, the other end of the upper stem 6 is connected to the conductive shell 10; one end of the lower stem 7 is The second terminal 14 is used for connecting wires. The other end of the lower stem 7 is connected to the conductive shell 10 . The first terminal 13 and the second terminal 14 are located on two sides of the conductive shell 10 .

Since the conductive shell 10 is provided with a through hole 9, the annular magnetic core 3 is inserted in the through hole 9, and the conductive core column is inserted in the annular magnetic core 3, that is, the conductive core column is located inside the annular magnetic core 3, The conductive shell 10 is located outside the annular magnetic core 3, and the conductive core post is connected to the conductive shell 10. Therefore, the conductive shell 10 and the conductive core post together form the secondary winding of the annular magnetic core 3, so that the secondary side The winding can perform voltage conversion with the primary winding 5 wound on the annular magnetic core 3 through the effect of electromagnetic mutual inductance.

The wire stem includes an upper stem 6 and a lower stem 7, the upper stem 6 and the lower stem 7 are respectively inserted in several annular magnetic cores 3 separated by insulating partitions 4, and the upper stem 6 and the The lower stem 7 is separated by an insulating baffle 8, the first terminal 13 of the upper stem 6 and the second terminal 14 of the lower stem 7 are located on both sides of the conductive shell 10, and the first connection of the upper stem 6 The end 13 and the second terminal 14 of the lower stem 7 should be kept insulated from the conductive shell 10, and the other ends other than the first terminal 13 of the upper stem 6 and the second terminal 14 of the lower stem 7 are all in contact with the conductive shell 10. The housing 10 is connected and maintained in electrical continuity.

Please refer to FIG. 2 and FIG. 3 , several annular magnetic cores 3 are separated by insulating partitions 4 and arranged side by side in the conductive housing 10, wherein each annular magnetic core 3 is wound with a primary winding 5, i1, i2 to in are the primary windings 5 wound on the toroidal magnetic core 3, and multiple primary windings 5 are connected in parallel, therefore, each group of primary windings 5 and the toroidal magnetic core 3 can be connected with The secondary windings perform voltage conversion through the electromagnetic mutual inductance effect, that is, multiple sets of primary windings 5 are simultaneously connected in parallel to exchange voltage with one set of secondary windings, so the output voltage of the secondary windings can be significantly increased.

Please refer to Figure 2 and Figure 3, the first terminal 13 of the upper stem 6 is the 3M terminal in the figure, the second terminal 14 of the lower stem 7 is the 3N terminal in the figure, and the 3M and 3N terminals are the output voltage In the figure, the 3O terminal is the conductive shell 10, and the 3O terminal is the negative terminal of the output voltage. In the actual use process, the circuit connection can be carried out according to the above method.

Therefore, the high-frequency transformer provided by the present invention, through multiple groups of primary windings 5 connected in parallel, simultaneously exchanges voltage with the secondary winding through the electromagnetic mutual inductance effect, the number of turns of the secondary winding is fixed to one turn and the primary winding When the number of turns of winding 5 is not reduced, the output voltage of the secondary winding can be multiplied, which can significantly increase the output voltage of the high-frequency transformer. Since the length of the high-frequency transformer can be adjusted according to needs, 3 to 5 windings can be placed One or more toroidal cores 3 and primary windings 5, so that the output voltage of a single high-frequency transformer can reach 75V or even higher. In addition, in the present invention, the annular magnetic core 3 is fixed side by side in the through hole 9 of the conductive shell 10, and the conductive core column is pierced in the annular magnetic core 3, and the conductive core column is electrically connected with the conductive shell 10 to serve as the secondary winding. , making the overall structure simple and easy to process, low in cost and convenient for mass production.

On the basis of the above embodiments, considering the specific structural configuration of the conductive housing 10, preferably, the conductive housing 10 is a rectangular parallelepiped shell, and the through hole 9 may be a cylindrical through hole penetrating along the length direction of the rectangular parallelepiped shell. Correspondingly, the annular magnetic core 3 can be a ring-shaped annular magnetic core adapted to the through hole 9, and the outer diameter of the annular magnetic core 3 should be smaller than the inner diameter of the through hole 9 so that the primary winding 5 is wound. The annular magnetic core 3 can be inserted into the through hole 9. In addition, the upper stem 6 and the lower stem 7 can also be semi-cylindrical stems suitable for the circular annular magnetic core. Of course, the conductive shell 10 can also be a cylindrical shell, the through hole 9 can be a cuboid through hole 9, and the annular magnetic core 3 can be a square annular magnetic core, which can be flexibly set according to actual needs.

On the basis of the above embodiments, considering the specific material selection of the upper stem 6 and the lower stem 7, since the upper stem 6 and the lower stem 7 should have good electrical conductivity, the upper stem 6 and the lower stem 7 should have good electrical conductivity. The stem 7 can be a copper rod or an aluminum rod. In addition, the upper stem 6 and the lower stem 7 can be made by longitudinally cutting a cylindrical copper rod or aluminum rod, and the diameters of the upper stem 6 and the lower stem 7 are determined by the inner diameter of the annular magnetic core 3 and the diameter of the high-frequency transformer. The output current is determined. Therefore, a reasonable cross-section and width of the conductive stem can be designed according to the needs under consideration of the skin effect of the high-frequency current.

On the basis of the above-mentioned embodiments, considering that the wires of the primary winding 5 need to be drawn out from the conductive casing 10 to connect to the power supply, therefore, a wire for leading out the primary winding 5 can be provided on the side wall of the conductive casing 10 The rectangular opening 11 is used for the lead-out of the wire of the primary winding 5 and the pouring of the potting glue. The rectangular opening 11 on the conductive shell 10 pours the heat-conducting potting glue into the inside of the transformer. After the glue is cured, the transformer works The heat generated inside can be transmitted to the surface of the conductive shell 10, thereby ensuring the performance of the product's high-frequency transformer.

On the basis of the above embodiments, considering the specific material selection of the conductive shell 10, preferably, the conductive shell 10 is an aluminum alloy shell, specifically a 6063 aluminum alloy material, which is a good conductor of electricity. The electrical conductivity of the high-frequency transformer is guaranteed. In addition, the aluminum alloy also has good thermal conductivity, which can speed up the heat dissipation of the high-frequency transformer and prolong its service life.

On the basis of any of the above-mentioned embodiments, considering the specific connection method between the conductive end cap 1 and the conductive shell 10, preferably, conductive end caps 1 are provided on both sides of the conductive shell 10, and the two conductive end caps 1 correspond to Connected to the upper stem 6 and the lower stem 7, the two conductive end caps 1 are respectively provided with openings 2 through which the first terminal 13 and the second terminal 14 pass, and the first terminal 13 and the second terminal The ends 14 respectively pass through the openings 2 and are kept insulated from the conductive end cap 1 .

Wherein, the conductive end cap 1 can be a thin plate matched with the end of the conductive shell 10, and the conductive end cap 1 is connected with the conductive shell 10 while being connected with the upper stem 6 and the lower stem 7, so that the upper stem 6 and the lower stem 7 are connected together. The lower stem 7 is respectively connected to the conductive shell 10 through the conductive end cap 1. For the convenience of connecting wires on the upper stem 6 and the lower stem 7, the first end of the upper stem 6 can be arranged on the conductive end cap 1. The opening 2 through which the terminal 13 and the second terminal 14 of the lower stem 7 pass, and the first terminal 13 of the upper stem 6 and the second terminal 14 of the lower stem 7 are kept insulated from the conductive end cover 1, In order to allow the first terminal 13 of the upper stem 6 and the second terminal 14 of the lower stem 7 to leak out of the conductive end cap 1 , it is convenient to connect wires.

On the basis of the above-mentioned embodiments, considering the specific setting of the length of the upper stem 6 and the lower stem 7 leaking from the outer end of the conductive end cap 1, preferably, the length of the upper stem 6 and the lower stem 7 are the same, and the upper The length of the stem 6 and the lower stem 7 is 20 to 40 mm longer than the length of the through hole 9 . In addition, considering the specific connection mode between the conductive end cap 1 and the conductive shell 10, and the specific connection mode between the conductive end cap 1 and the upper stem 6 and the lower stem 7, the preferred conductive shell 10 and the conductive end cap 1 are connected by screws 12 Fixing, the upper stem 6 and the lower stem 7 are both connected and fixed with the conductive end cover 1 through screws 12 .

A threaded hole can be provided at the end of the conductive shell 10, and correspondingly, a through hole 9 corresponding to the threaded hole on the end of the conductive shell 10 is provided on the conductive end cover 1, so that the conductive end cover 1 is fixed on the conductive end cover 1 by screws 12. The end of the conductive shell 10, similarly, can be provided with a threaded hole at one end far away from the first terminal 13 of the upper stem 6 and the second terminal 14 of the lower stem 7, and on the conductive end cover 1 and the upper The through holes 9 corresponding to the threaded holes on the stem 6 and the lower stem 7 are used to fix the conductive end cap 1 to the ends of the upper stem 6 and the lower stem 7 through screws 12 .

On the basis of the above embodiments, considering the specific material selection of the conductive end cap 1 , preferably, the conductive end cap 1 is a copper plate. Aluminum alloy conductive shell 10, upper stem 6, lower stem 7, two copper conductive end caps 1 and other parts can be realized by simple mechanical processing methods because of their relatively simple shape rules. It is easy to produce in batches, and the cost is low, which can bring significant economic benefits to application enterprises.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The high frequency transformer provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. a kind of high-frequency transformer is characterized in that, comprises conductive casing (10), and described conductive casing (10) is provided with through hole (9), and described through hole (9) is inserted with several by insulation The annular magnetic cores (3) separated by the separator (4), each of the annular magnetic cores (3) is wound with a primary winding (5), and several primary windings (5) are connected in parallel , also includes conductive stems inserted in several annular magnetic cores (3), said conductive stems include upper stems (6) and lower stems ( 7), one end of the upper stem (6) is a first terminal (13) for connecting wires, and the other end of the upper stem (6) is connected to the conductive shell (10); the One end of the lower stem (7) is a second terminal (14) for connecting wires, the other end of the lower stem (7) is connected to the conductive shell (10), and the first terminal ( 13) and the second terminal (14) are located on both sides of the conductive shell (10). 2. The high-frequency transformer according to claim 1, characterized in that, the conductive shell (10) is a cuboid shell, and the through hole (9) is a cylindrical shell penetrating along the length direction of the cuboid shell through hole. 3. The high-frequency transformer according to claim 2, characterized in that, the annular magnetic core (3) is a circular magnetic core, and the upper stem (6) and the lower stem (7) All are semi-cylindrical stems. 4. The high-frequency transformer according to claim 3, characterized in that, the upper stem (6) and the lower stem (7) are copper rods or aluminum rods. 5. The high-frequency transformer according to claim 1, characterized in that, the side wall of the conductive casing (10) is provided with a rectangle for leading out the wires on the primary winding (5) and pouring potting glue. Open the hole (11). 6. The high-frequency transformer according to claim 5, characterized in that, the conductive shell (10) is an aluminum alloy shell. 7. The high-frequency transformer according to any one of claims 1 to 6, characterized in that, both sides of the conductive housing (10) are provided with conductive end caps (1), and two of the conductive end caps ( 1) Correspondingly connected to the upper stem (6) and the lower stem (7), the two conductive end caps (1) are respectively provided with the first terminal (13) and The opening (2) through which the second terminal (14) passes, the first terminal (13) and the second terminal (14) respectively pass through the opening (2) and are connected to the The conductive end cap (1) remains insulated. 8. The high-frequency transformer according to claim 7, characterized in that, the upper stem (6) and the lower stem (7) have the same length, and the upper stem (6) and the lower stem (7) have the same length The length of the lower stem (7) is 20 to 40 mm larger than the length of the through hole (9). 9. The high-frequency transformer according to claim 8, characterized in that, the conductive shell (10), the upper stem (6) and the lower stem (7) are all connected to the conductive end cap ( 1) Connect and fix with screws (12). 10. The high-frequency transformer according to claim 9, characterized in that, the conductive end cover (1) is a copper plate.