CN206819866U - Transformer - Google Patents

Abstract

The utility model provides a transformer, which comprises at least two magnetic cores, at least two primary windings with a cake-shaped structure, at least two secondary windings with a laminated structure, at least two primary output pins arranged with the magnetic cores in an insulating way, at least two first secondary output pins arranged with the magnetic cores in an insulating way and at least one second secondary output pin arranged with the magnetic cores in an insulating way; the at least two magnetic cores are arranged side by side, and the side edges of the two adjacent magnetic cores are mutually attached in an insulating way; each magnetic core is wound with at least one primary winding and at least one secondary winding, and the primary winding and the secondary winding on the same magnetic core are arranged in a laminated mode; at least two primary windings are connected in series and at least two secondary windings are connected in parallel. The utility model discloses a transformer is small, power level is high and be applicable to the narrow occasion in space.

Description

a transformer

technical field

The utility model relates to the technical field of power supplies, in particular to a transformer.

Background technique

Transformers are mainly composed of magnetic cores, skeletons, windings, insulators and fasteners. In order to be able to be used in high-power, low-voltage, and high-current applications (such as inside LED display devices), existing transformers generally increase the magnetic core and skeleton, and in order to meet the requirements of high current, the diameter of the winding wire needs to be increased. All of these lead to a larger volume of the transformer and a square shape, so that the existing high-power, low-voltage, and high-current transformers are not suitable for applications where the space is narrow and the power density is high.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a transformer with small volume, high power level and suitable for occasions with narrow space.

In order to achieve the above object, the utility model provides a transformer on the one hand, which includes at least two magnetic cores, at least two primary windings with a pie-shaped structure, at least two secondary windings with a laminated structure, at least two One primary output pin insulated from the magnetic core, at least two first secondary output pins insulated from the magnetic core, and at least one second secondary output pin insulated from the magnetic core ;

The at least two magnetic cores are arranged side by side, and the sides of the adjacent two magnetic cores are insulated from each other; each of the magnetic cores is wound with at least one of the primary windings and at least one of the a secondary winding, and the primary winding and the secondary winding on the same magnetic core are stacked; the at least two primary windings are connected in series, and the at least two secondary windings are connected in parallel;

The at least two primary output pins are led out from the at least two primary windings in one-to-one correspondence, and the at least two first secondary output pins are led out from the at least two secondary windings in one-to-one correspondence, The at least one second secondary output pin is led out from the parallel connection of the secondary windings on two adjacent magnetic cores.

Further, the transformer also includes at least two inductors, one end of the coil of the at least two inductors is connected to the parallel connection of the secondary winding on each of the magnetic cores in a one-to-one correspondence, and the at least two The other ends of the coils of the inductors are correspondingly connected to the second secondary output pins.

Further, the inductance is a magnetic ring inductance.

Further, the transformer further includes a bus bar that is insulated from the at least two magnetic cores, and the bus bar includes at least one branch bar, a first main block, and a second main block; wherein, the magnetic core The side aligned with the through hole of the primary winding is the top of the magnetic core, and the side of the magnetic core aligned with the through hole of the secondary winding is the bottom of the magnetic core; The tops of the at least two magnetic cores extend outwards and are parallel to the tops of the magnetic cores; the at least one branch bar passes through the through holes of the magnetic ring inductor one by one, and the at least one One end of the root branch is connected to the first main block, and the other end of the at least one branch is connected to the parallel connections of the secondary magnetic core windings on each of the magnetic cores in one-to-one correspondence; One end of the second main block is connected to the first main block, and the other end of the second main block extends to the bottom of the magnetic core and serves as the second secondary output pin.

Further, the transformer further includes a printed circuit board, the printed circuit board extends outward from the bottoms of the at least two magnetic cores, the printed circuit board is parallel to and close to the bottoms of the two magnetic cores The at least two secondary windings; the first main block is parallel to and opposite to the printed circuit board, and the branch is arranged between the printed circuit board and the first main block; the at least two Both the first primary output pin and the at least one second secondary output pin lead out to the bottom of the magnetic core, and the at least two first secondary output pins are arranged on one side of the printed circuit board and near the bottom of the core.

Further, the number of the magnetic core and the primary winding is two, and the number of the secondary winding is four; wherein two secondary windings are wound on one of the magnetic cores in parallel, and the other two two secondary windings are wound in parallel on the other said core, and two of said secondary windings on one said magnetic core are connected with the other two said secondary windings on the other said magnetic core connected in parallel.

Further, the magnetic core is EI type, EQ type or EQI type.

Further, the secondary windings are copper strip structures.

Further, wrapping tape is wrapped around the magnetic core.

Further, the primary output pins are covered with Teflon sleeves.

In the transformer provided by the utility model, at least two primary windings are connected in series and at least two secondary windings are connected in parallel, so that the transformer can meet the requirements of low voltage and high current and can improve the The power level of the transformer; and let the primary winding adopt a pie structure, and let the secondary winding adopt a laminated structure, so that not only the transformer can meet the requirements of low voltage and high current, but also the The transformer does not need to use a skeleton, so that the volume of the transformer can be reduced; and by arranging the two magnetic cores side by side, the transformer can be made into a narrow and long structure, so that the transformer can be used in space Narrow occasions. Therefore, the transformer of the present invention has small volume, high power level and is suitable for occasions with narrow spaces.

Description of drawings

In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings that need to be used in the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the utility model. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a front view of a transformer provided by an embodiment of the present invention;

Fig. 2 is a left view of a transformer provided by an embodiment of the present invention;

Fig. 3 is a top view of a transformer provided by an embodiment of the present invention;

Fig. 4 is a right view of a transformer provided by an embodiment of the present invention;

Fig. 5 is a circuit structure diagram of a transformer provided by an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Fig. 1 to Fig. 4, the utility model provides a transformer, which includes at least two magnetic cores 1, at least two primary windings 2 of pie structure, and at least two secondary windings of laminated structure 3. At least two primary output pins 4 that are insulated from the magnetic core 1, at least two first secondary output pins 5 that are insulated from the magnetic core 1, and at least one that is insulated from the magnetic core 1 Set the second secondary output pin 6;

The at least two magnetic cores 1 are arranged side by side and the sides of the two adjacent magnetic cores 1 are insulated from each other; each of the magnetic cores 1 is wound with at least one primary winding 2 and At least one secondary winding 3, and the primary winding 2 and the secondary winding 3 on the same magnetic core 1 are stacked; the at least two primary windings 2 are connected in series, and the at least The two secondary windings 3 are connected in parallel;

The at least two primary output pins 4 are drawn out from the at least two primary windings 2 in one-to-one correspondence, and the at least two first secondary output pins 5 are drawn out from the at least two secondary windings 3 one by one Correspondingly, the at least one second secondary output pin 6 is drawn from the parallel connection of the secondary windings 3 on two adjacent magnetic cores 1 .

Wherein, the primary winding 2 is a cake structure, which can increase the winding density and the number of turns of the primary winding 2, and can make the primary winding 2 need not be wound by a skeleton, thereby reducing the volume of the transformer; The secondary winding 3 is a laminated structure, which can enhance the conductivity of the secondary winding 3, and can make the secondary winding 3 not need to be wound by a skeleton, thereby reducing the volume of the transformer.

Preferably, the secondary winding 3 is copper sheet winding. Wherein, the copper sheet winding has good electrical conductivity, so that the transformer can meet the application requirements of high current. It should be noted that the secondary winding 3 can also be an aluminum sheet winding or an alloy sheet winding, etc., and the copper sheet winding can be an integrally formed copper sheet winding or a copper sheet formed by stacking a plurality of copper sheets sequentially. The sheet winding is not specifically limited here.

Preferably, the magnetic core 1 is EI type, EQ type or EQI type. Wherein, the magnetic core 1 is EI type, EQ type or EQI type so that the structure of the transformer is compact.

Preferably, wrapping tape is wrapped around the magnetic core 1 . In this way, the transformer can meet the requirements of safety regulations. It should be noted that the periphery of the magnetic core 1 can also be wrapped with an insulating plastic case to meet safety requirements.

Preferably, referring to FIG. 1 , the primary output pins 4 are all covered with Teflon sleeves 7 . In this way, the primary output pin 4 can be insulated from the magnetic core 1 , so that the transformer can meet safety requirements. It should be noted that the primary output pin 4 can also be wrapped with a layer of insulating plastic film or sprayed with insulating varnish to meet safety requirements, which is not specifically limited here.

In the embodiment of the utility model, by connecting at least two primary windings 2 in series and at least two secondary windings 3 in parallel, not only can the transformer meet the requirements of low voltage and high current, but also can Improve the power level of the transformer; and let the primary winding 2 adopt a pie structure, and let the secondary winding 3 adopt a laminated structure, so that not only the transformer can meet the requirements of low voltage and high current, but also The transformer does not need to use a skeleton, so that the volume of the transformer can be reduced; and by arranging the two magnetic cores 1 side by side, the transformer can be made into a narrow and long structure, so that the Transformers can be used in places where space is limited. Therefore, the transformer of the present invention has small volume, high power level and is suitable for occasions with narrow spaces.

To further improve the above technical solution, please refer to Figures 1 to 4, the transformer also includes at least two inductors 8, and one end of the coil of the at least two inductors 8 is connected to each of the magnetic cores 1 respectively. The parallel connections of the secondary windings 3 are connected one by one, and the other ends of the coils of the at least two inductors 8 are connected to the second secondary output pins 6 correspondingly.

Wherein, when the transformer is applied in an LLC resonant converter (LLC resonant converter is a switching power supply topology, it relies on the resonant inductance and resonant capacitor in the circuit to achieve soft switching action during operation, thereby reducing conduction loss and power loss), by integrating the inductance 8 on the output part of the secondary winding 3 of the transformer (that is, the parallel connection of the secondary winding 3), so that when the transformer is working, the primary The equivalent mode of the stage can make the inductance of the inductor 8 reflect back to the primary side of the transformer (that is, the primary winding 2), so that the inductor 8 can be used as a resonant inductor to make the LLC resonant converter work normally. Therefore, by integrating the inductance 8 at the output part of the secondary winding 3, the transformer can reduce the working loss of the LLC resonant converter so as to improve the working efficiency of the LLC resonant converter.

Further, referring to FIG. 1 to FIG. 4 , the inductance 8 is a magnetic loop inductance 8 . Wherein, the magnetic ring inductor 8 has the advantages of small size and low cost.

Further, referring to Fig. 1 to Fig. 4, the transformer further includes a bus bar 9 which is insulated from the at least two magnetic cores 1, and the bus bar 9 includes at least one branch bar 90, a first main block 91 and the second main block 92; wherein, the side of the magnetic core 1 aligned with the through hole of the primary winding 2 is the top of the magnetic core 1, and the magnetic core 1 is aligned with the secondary winding 3 One side of the through hole is the bottom of the magnetic core 1; the first main block 91 extends outward from the top of the at least two magnetic cores 1 and is parallel to the top of the magnetic core 1; the at least One branch 90 passes through the through holes of the magnetic ring inductor 8 one by one, and one end of the at least one branch 90 is connected to the first main block 91, and the at least one branch 90 The other end of the second main block 92 is connected to the parallel connection of the windings of the secondary magnetic core 1 on each of the magnetic cores 1 in one-to-one correspondence; one end of the second main block 92 is connected to the first main block 91, so The other end of the second main block 92 extends toward the bottom of the magnetic core 1 and serves as the second secondary output pin 6 .

Wherein, the parallel connection of the secondary winding 3 is connected to the bus bar 9, so that the current output capability of the secondary winding 3 can be improved, and the conduction loss of the current of the secondary winding 3 can be reduced, Therefore, the working efficiency of the transformer can be improved. In addition, by passing the branch bar 90 through the through hole of the magnetic ring inductor 8, the magnetic ring inductor 8 can be integrated with the branch bar 90 of the bus bar 9, so that the The structure of the transformer is compact. It should be noted that the material of the support bar 90, the first main block 91 and the second main block 92 is preferably copper, and the support bar 90, the first main block 91 and the The above-mentioned second main block 92 is integrally formed. In addition, when there is no coil wound on the magnetic ring inductance 8 but only a magnetic ring, because the branch 90 passes through the through hole of the magnetic ring, the magnetic ring can be regarded as a coil wound with one coil (that is, the magnetic ring inductance 8 of the branch bar 90).

Further, referring to Fig. 1 to Fig. 3, the transformer also includes a printed circuit board 10, and the printed circuit board 10 extends outward from the bottom of the at least two magnetic cores 1, and the printed circuit board 10 10 is parallel to the bottom of the two magnetic cores 1 and close to the at least two secondary windings 3; the first main block 91 is parallel to and opposite to the printed circuit board 10, and the branch bar 90 is arranged on the between the printed circuit board 10 and the first main block 91; the at least two primary output pins 4 and the at least one second secondary output pin 6 are drawn out to the bottom of the magnetic core 1, The at least two first secondary output pins 5 are disposed on one side of the printed circuit board 10 and close to the bottom of the magnetic core 1 .

Wherein, by disposing the printed circuit board 10 at the bottom of at least two magnetic cores 1 , the two magnetic cores 1 and the printed circuit board 10 can be fixed as a whole. And by setting the at least two first secondary output pins 5 on one side of the printed circuit board 10 and close to the bottom of the magnetic core 1, the first secondary output pins 5 can be made get fixed. And the at least two primary output pins 4 and the at least one second secondary output pin 6 are drawn to the bottom of the magnetic core 1, so that the first secondary output pin 5, The second secondary output pin 6 and the primary output pin 4 are arranged in the same direction (that is, all three are at the bottom of the magnetic core 1 ), so as to facilitate the soldering of the three to an external circuit board. In addition, by arranging the first main block 91 and the printed circuit board 10 parallel and opposite to each other on the bottom and top of the magnetic core 1, and setting the inductor 8 on the first main block between the block 91 and the printed circuit board 10, so that the structure of the transformer can be made compact.

Preferably, please refer to FIG. 5 , the number of the magnetic core 1 and the number of the primary windings 2 is two, and the number of the secondary windings 3 is four; wherein two secondary windings 3 are wound in parallel On one of the magnetic cores 1, the other two secondary windings 3 are wound in parallel on the other said magnetic core 1, and the two of the secondary windings 3 on one of the magnetic cores 1 are connected with the other The other two secondary windings 3 on the magnetic core 1 are connected in parallel. Wherein, preferably two magnetic cores 1 can make the volume of the transformer relatively small, so that the transformer can be applied to occasions where the space is relatively narrow. And each of the magnetic cores 1 is wound with two secondary windings 3 in parallel, and two of the secondary windings 3 on one of the magnetic cores 1 are connected to the other two on the other magnetic core 1. The two secondary windings 3 are connected in parallel, so that the power density level of the transformer with only one secondary winding 3 wound on the magnetic core 1 can be higher. Here, to illustrate this preferred embodiment, the two magnetic cores 1 can be selected from the magnetic core 1 of the EQI26 type transformer, and the number of turns of the two primary windings 2 can be 21 turns. The number of turns of the coils of the four secondary windings 3 may all be 1 turn.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any skilled person familiar with the technology in the art can easily think of changes within the technical scope disclosed in the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. A kind of 1. transformer, it is characterised in that the armature winding, extremely including at least two magnetic cores, at least two for cake formula structure Few two are the secondary windings of laminated structure, at least two primary output pins set with the magnetic core isolation, at least two The individual first level output pin set with the magnetic core isolation and at least one second set with the magnetic core isolation Level output pin；

   At least two magnetic core is arranged side by side and the insulated fitting between each other of the side of adjacent two magnetic cores；It is each The individual magnetic core is wound with least one armature winding and at least one secondary windings, and the same magnetic Both the armature winding on core and described secondary windings are stacked；At least two primary windings connected in series connection, institute At least two secondary windings are stated to be connected in parallel；

   At least two primary output pin is drawn correspondingly from least two armature winding, and described at least two First level output pin is drawn correspondingly from least two secondary windings, at least one second subprime output Pin is drawn from the place of being connected in parallel of the secondary windings on two adjacent magnetic cores.
2. 2. transformer according to claim 1, it is characterised in that also including at least two inductance, at least two electricity Be connected in parallel place of the coil one end of sense respectively with the secondary windings each described on magnetic core connects one to one, described The connection corresponding with the second subprime output pin of the other end of the coil of at least two inductance.
3. 3. transformer according to claim 2, it is characterised in that the inductance is ring inductance.
4. 4. transformer according to claim 3, it is characterised in that also set including one piece and at least two magnetic core isolation The busbar put, the busbar include at least a lattice framing, first main piece and second main piece；Wherein, the magnetic core alignment One side of the through hole of the armature winding is the top of the magnetic core, and the magnetic core is directed at one side of the through hole of the secondary windings For the bottom of the magnetic core；

   Described first main piece extends outward and parallel with the top of the magnetic core at the top of at least two magnetic core；Institute State an at least lattice framing correspondingly pass through the ring inductance through hole, and one end of at least one lattice framing with it is described First main piece of connection, the other end of at least one lattice framing and the secondary magnetic core winding on each described magnetic core and Connection junction connects one to one；Described second main piece one end is connected with described first main piece, described second main piece another Hold and extend to the bottom of the magnetic core and be used as the second subprime output pin.
5. 5. transformer according to claim 4, it is characterised in that also including a printed circuit board (PCB), the printed circuit board (PCB) Extended outward from the bottom of at least two magnetic core, the printed circuit board (PCB) is parallel with the bottom of described two magnetic cores simultaneously Close at least two secondary windings；

   Described first main piece parallel and relative with the printed circuit board (PCB), and the lattice framing is located at the printed circuit board (PCB) and described the Between one main piece；

   At least two primary output pin and at least one second subprime output pin are to the bottom of the magnetic core Portion is drawn, and at least two first level output pins are in the one side of the printed circuit board (PCB) and close to the magnetic core Bottom.
6. 6. according to the transformer described in claim 1 to 5 any one, it is characterised in that the magnetic core and it is described it is primary around The quantity of group is two, and the quantity of the secondary windings is four；Two of which secondary windings winds wherein one in parallel On the individual magnetic core, two other secondary windings is wrapped on another described magnetic core in parallel, and one of them described magnetic core On two of which described in secondary windings be connected in parallel with two other described secondary windings another described on magnetic core.
7. 7. according to the transformer described in claim 1 to 5 any one, it is characterised in that the magnetic core be EI types, EQ types or EQI types.
8. 8. according to the transformer described in claim 1 to 5 any one, it is characterised in that the secondary windings be copper sheet around Group.
9. 9. according to the transformer described in claim 1 to 5 any one, it is characterised in that the periphery of the magnetic core is wound with Encapsulated band.
10. 10. according to the transformer described in claim 1 to 5 any one, it is characterised in that the primary output pin is arranged There is Teflon sleeve pipe.