CN113571306A

CN113571306A - Transformer and charger

Info

Publication number: CN113571306A
Application number: CN202110741485.XA
Authority: CN
Inventors: 洪良
Original assignee: Mobai Beijing Information Technology Co Ltd
Current assignee: Mobai Beijing Information Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-10-29

Abstract

The present disclosure provides a transformer and a charger. The transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are wound on the magnetic core; the primary winding and the secondary winding jointly form a multilayer winding structure from the magnetic core to the outside; the primary winding and the secondary winding in the same layer of winding structure form a plurality of turns of windings which are arranged in parallel; the first position of the P-layer winding structure is a primary winding, the second position of the P-layer winding structure is a secondary winding, the first position is a position corresponding to the position of the secondary winding in the Q-layer winding structure, the second position is a position corresponding to the position of the primary winding in the Q-layer winding structure, and the P-layer winding structure and the Q-layer winding structure are of two adjacent layers of winding structures.

Description

Transformer and charger

Technical Field

The present disclosure relates to electronic circuits, and more particularly, to a transformer and a charger.

Background

The currently commonly used transformer mainly comprises two components: the transformer comprises a winding and a magnetic core, wherein the magnetic core loss is mainly determined by the magnetic core material and the magnetic core structure, so that the design of the transformer is mainly the design of the winding.

The conventional solution for transformer winding is to wind the primary side of the transformer first and then the secondary side of the transformer, which cannot reduce the ac losses caused by the proximity effect between the conductors. In engineering, a sandwich winding scheme is also commonly used for designing a transformer, as shown in fig. 1, a cylindrical magnetic core is arranged in the middle, and the primary side of the transformer, the secondary side of the transformer, the primary side of the transformer and the secondary side of the transformer are wound outside the magnetic core. The sandwich winding scheme still does not meet the requirements.

Disclosure of Invention

It is an object of the present disclosure to provide a new transformer, which can further reduce the ac loss of the transformer, thereby improving the efficiency of the transformer.

According to a first aspect of the present disclosure, a transformer is provided.

The transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are wound on the magnetic core; the primary winding and the secondary winding jointly form a multilayer winding structure from the magnetic core to the outside; the primary winding and the secondary winding in the same layer of winding structure form a plurality of turns of windings which are arranged in parallel; the first position of the P-layer winding structure is a primary winding, the second position of the P-layer winding structure is a secondary winding, the first position is a position corresponding to the position of the secondary winding in the Q-layer winding structure, the second position is a position corresponding to the position of the primary winding in the Q-layer winding structure, and the P-layer winding structure and the Q-layer winding structure are of two adjacent layers of winding structures.

Optionally, in one layer of the winding structure, there is at least one different section of the primary winding of the turn distributed in at least two turns of the winding and/or there is at least one different section of the secondary winding of the turn distributed in at least two turns of the winding.

Optionally, in one layer of winding structure, at least one turn of winding includes both the primary winding and the secondary winding.

Optionally, the primary winding and the secondary winding are implemented by using a flexible circuit board.

Optionally, the primary winding and the secondary winding are respectively realized by a strip-shaped flexible circuit board; the flexible circuit board comprises a first unit and a second unit which are alternately arranged along the length direction, the first unit comprises a plurality of steps from low to high, the second unit comprises a plurality of steps from high to low, and the length of the steps is equal to the length required by the magnetic core for surrounding a half circle; and the lead circuit on the flexible circuit board extends along the length direction of the flexible circuit board and fluctuates along with the height of the step.

Optionally, a gap extending along the length direction of the flexible circuit board is formed in the middle section of at least one step, so that the lead line is divided into two parallel sub-lines in the middle section of the step; or at least two parallel lead lines are arranged at the middle section of one step and are combined into one lead line at the edge of the step.

Optionally, the flexible circuit board is of a double-layer circuit structure; along the length direction of the flexible circuit board, each layer of circuit structure comprises a head part, a middle part and a tail part, and the middle part of each layer of circuit structure comprises a first circuit and a second circuit which are parallel to each other; the first line comprises a plurality of mutually separated first sub-lines, the second line comprises a plurality of mutually separated second sub-lines, and the first sub-lines and the second sub-lines are aligned one by one; the tail part of the Mth first sub-line of the top layer line structure is connected with the head part of the Nth second sub-line of the top layer line structure, the tail part of the Mth second sub-line of the bottom layer line structure is connected with the head part of the Nth first sub-line of the bottom layer line structure, wherein N is M +1, and M is more than or equal to 1; the head part of the L-th first sub-line of the top layer line structure is interconnected with the head part of the L-th first sub-line of the bottom layer line structure through a through hole, and the tail part of the L-th first sub-line of the top layer line structure is interconnected through a through hole; the head part of the L-th second sub-line of the top layer line structure is interconnected with the head part of the L-th second sub-line of the bottom layer line structure through a through hole, and the tail part of the L-th second sub-line of the top layer line structure is interconnected through a through hole, wherein L is more than or equal to 1; the head of the top layer circuit structure is connected with the head of the bottom layer circuit structure, and the tail of the top layer circuit structure is connected with the tail of the bottom layer circuit structure.

According to a second aspect of the present disclosure, a transformer is provided.

The transformer comprises a magnetic core, a framework, a primary winding and a secondary winding; the framework is sleeved outside the magnetic core, the framework is provided with a plurality of annular runways which are arranged in parallel, and the runways are provided with openings; the primary winding and the secondary winding are distributed on the framework along the runway and form a multilayer winding structure outwards from the framework; the primary winding is distributed in each layer of winding structure through the opening, and the secondary winding is distributed in each layer of winding structure through the opening; the first position of the P-layer winding structure is a primary winding, the second position of the P-layer winding structure is a secondary winding, the first position is a position corresponding to the position of the secondary winding in the Q-layer winding structure, the second position is a position corresponding to the position of the primary winding in the Q-layer winding structure, and the P-layer winding structure and the Q-layer winding structure are of two adjacent layers of winding structures.

Optionally, at least two openings are provided on the runway; in the same layer of winding structure, at least one circle of primary winding is distributed on different runways through the opening, and/or at least one circle of secondary winding is distributed on different runways through the opening.

Optionally, in the same layer of winding structure, the primary winding and the secondary winding are distributed on the same runway simultaneously through at least two openings on the same runway.

According to a third aspect of the present disclosure, there is provided a charger including the transformer according to any one of the first or second aspects of the present disclosure.

The embodiment of the disclosure provides a transformer, which reduces the alternating current loss of the transformer by changing the winding mode of a winding of the transformer, thereby improving the efficiency of the transformer and a charger using the transformer.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a transformer winding provided in the conventional art;

fig. 2 is a schematic structural diagram of a transformer winding provided by a first embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a bobbin of a transformer according to a first embodiment of the present disclosure;

fig. 4(a) -4(b) are schematic structural diagrams of a transformer winding provided by a second embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a transformer winding provided by a third embodiment of the present disclosure;

fig. 6(a) -6(b) are schematic structural diagrams of a transformer winding provided by a fourth embodiment of the present disclosure;

fig. 7(a) -7(b) are schematic structural diagrams of a transformer winding provided by a fifth embodiment of the present disclosure;

fig. 8(a) -8(b) are schematic structural diagrams of a transformer winding provided by a sixth embodiment of the present disclosure;

fig. 9(a) -9(c) are schematic structural diagrams of a transformer winding provided by a seventh embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a transformer winding provided by an eighth embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a transformer winding according to a tenth embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to FIG. 1, the left side of the sandwich winding structure is a perspective view, and the right side is a cross-sectional view along the direction A-A'. The middle part is a cylindrical magnetic core, a multilayer winding structure is formed by winding the magnetic core outwards, a primary side of a layer of transformer is wound outside the magnetic core, a secondary side of the layer of transformer is wound, the primary side of the layer of transformer is wound, and finally the secondary side of the layer of transformer is wound. Each layer of winding structure comprises 5 turns of windings arranged in parallel from top to bottom, the current direction is shown by an 'x' symbol and a't' symbol, the't' symbol indicates that the current direction is vertical to the paper surface and points out of the paper, and the 'x' symbol indicates that the current direction is vertical to the paper surface and points into the paper.

The inventor finds through research and analysis that the sandwich winding method can essentially solve the problem of magnetic field uniformity in the x direction in the traditional transformer design scheme, has no obvious improvement effect on the magnetic field uniformity in the y direction, and can only reduce the alternating current loss to a certain extent.

In order to solve the above problem, embodiments of the present disclosure provide a transformer having a low ac loss.

The transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are wound on the magnetic core. The primary winding and the secondary winding together form a multilayer winding structure outward from the magnetic core.

The primary winding and the secondary winding in the same layer of winding structure form a plurality of turns of windings which are arranged in parallel. That is, the primary winding and the secondary winding are both provided in the same layer of winding structure, rather than only the primary winding or only the secondary winding being wound in the same layer of winding structure.

The first position of the P-th layer winding structure is a primary winding, and the second position of the P-th layer winding structure is a secondary winding. The first position of the P-layer winding structure is a position corresponding to the position of the secondary winding in the Q-layer winding structure, and the second position of the P-layer winding structure is a position corresponding to the position of the primary winding in the Q-layer winding structure. The P-layer winding structure and the Q-layer winding structure are two adjacent layers of winding structures. That is, for the adjacent two-layer winding structure, the primary winding at the outer layer covers the secondary winding at the inner layer, and the secondary winding at the outer layer covers the primary winding at the inner layer.

Through test verification, the transformer of the embodiment of the disclosure reduces the alternating current loss of the transformer and improves the efficiency of the transformer by changing the winding mode of the winding of the transformer. By using the transformer provided by the embodiment of the disclosure in the charger, the charging efficiency of the charger can be improved. The transformer of the embodiment of the disclosure can realize better energy conservation and efficiency improvement under lower hardware cost.

Alternatively, in one layer of the winding structure, different segments of the primary winding, where there is at least one turn, are distributed in at least two turns of the winding. For example, in the first layer winding structure, when the primary winding is wound around the magnetic core for a second turn, one half turn of the second turn is in the second turn winding and the other half turn of the second turn is in the first turn winding, the primary winding of the first turn spans over multiple turns of the winding.

Optionally, in one layer of the winding structure, there is at least one different section of the secondary winding of one turn distributed in at least two turns of the winding. For example, in the first layer winding structure, when the secondary winding is wound around the magnetic core for a second turn, one half turn of the second turn is in the third turn winding and the other half turn of the second turn is in the fourth turn winding, the secondary winding for the second turn spans the multiple turn winding.

Optionally, in one layer of the winding structure, there are at least one different segment of the one-turn secondary winding distributed in the at least two-turn winding and at least one different segment of the one-turn secondary winding distributed in the at least two-turn winding. For example, in the first layer of winding structure, one half turn of the second turn of the primary winding is in the second turn winding, the other half turn of the second turn of the primary winding is in the first turn winding, one half turn of the second turn of the secondary winding is in the third turn winding, and the other half turn of the second turn of the secondary winding is in the fourth turn winding.

Tests prove that the transformer disclosed by the embodiment of the disclosure can enable the uniformity of a magnetic field to be higher and further reduce the alternating current loss of the transformer by changing the winding mode of a winding of the transformer.

Optionally, in one layer of winding structure, at least one turn of winding includes both the primary winding and the secondary winding. For example, in the first layer of winding structure, one half turn of the first turn of the primary winding is in the first turn winding, the other half turn of the first turn of the primary winding is in the second turn winding, one half turn of the second turn of the secondary winding is in the second turn winding, and the other half turn of the second turn of the secondary winding is in the first turn winding. The first turn winding of the first layer of winding structure comprises a half turn of the first turn of the primary winding and a half turn of the second turn of the secondary winding, and the second turn winding of the first layer of winding structure comprises the other half turn of the first turn of the primary winding and the other half turn of the second turn of the secondary winding.

Alternatively, the primary winding and the secondary winding of the transformer can be implemented by using flexible circuit boards.

Alternatively, the primary winding and the secondary winding of the transformer may be implemented using wires.

In the drawings of the present disclosure, the primary winding is represented in the form of a combined number of the symbol "P", and the secondary winding is represented in the form of a combined number of the symbol "S". "P1", "P2", "P3" and "P4" respectively indicate that the primary windings of the first, second, third and fourth circles are continuous. "S1", "S2", "S3" and "S4" respectively indicate that the first turn of secondary winding, the second turn of secondary winding, the third turn of secondary winding and the fourth turn of secondary winding are continuous with each other. Embodiments of the present disclosure are described below with reference to the drawings.

< first embodiment >

A transformer provided in a first embodiment of the present disclosure is explained with reference to fig. 2 to 3. Fig. 2 is a schematic structural diagram of a transformer winding provided in a first embodiment of the present disclosure. Fig. 3 is a schematic structural diagram of a bobbin of a transformer according to a first embodiment of the present disclosure.

The transformer comprises a magnetic core, a framework, a primary winding and a secondary winding. The framework is sleeved outside the magnetic core, a plurality of annular runways which are arranged in parallel are arranged on the framework, and openings are arranged on the runways. In one example, the openings of different runways may correspond to each other. In one example, a top view of the framework can be seen in fig. 3, the framework includes a framework body 10 and a baffle 20 disposed outside the framework body 10 and perpendicular to the framework body 10, where the baffle 20 is a runway. The multiple rows of baffles 20 are arranged in parallel, and the openings R1 and R2 are respectively arranged at corresponding positions of the multiple rows of baffles 20. The baffle type runway can provide a limiting effect, and the winding is borne on the baffle to achieve a stable effect.

The left drawing of fig. 2 is a top view of the magnetic core and the framework, the framework is provided with 4 parallel runways, which are a first runway, a second runway, a third runway and a fourth runway in sequence, and each runway is provided with an opening R1 and an opening R2 at corresponding positions.

The primary winding and the secondary winding are distributed on the framework along the runway and jointly form a multilayer winding structure from the framework to the outside. The primary winding is distributed in each layer of winding structure through the opening, and the secondary winding is distributed in each layer of winding structure through the opening.

The right diagram of fig. 2 shows a schematic cross-sectional view of the first and second layer of winding structures at position W1, and a schematic cross-sectional view of the first and second layer of winding structures at position W2.

Referring to the right diagram of fig. 2, the first layer winding structure and the second layer winding structure respectively include 4 turns of windings arranged in parallel, namely a first turn, a second turn, a third turn and a fourth turn, corresponding to the first runway, the second runway, the third runway and the fourth runway arranged in parallel. The first layer of winding structure comprises a first circle P1 and a second circle P2 of a primary winding, and a first circle S1 and a second circle S2 of a secondary winding. The second layer of winding structure comprises a third winding P3 and a fourth winding P4 of the primary winding, and a third winding S3 and a fourth winding S4 of the secondary winding.

In the first embodiment, the primary windings of the same turn are distributed on the same runway only in one layer of winding structure. For example, in the first layer winding structure, the first turn P1 of the primary winding is wound on only the first track, the second turn P2 of the primary winding is wound on only the second track, the first turn S1 of the secondary winding is wound on only the fourth track, and the second turn S2 of the secondary winding is wound on only the third track.

Referring to the right diagram of fig. 2, the first position of the first layer of winding structure is the primary winding and the second position of the first layer of winding structure is the secondary winding. The first position of the first layer of winding structure is a position corresponding to the position of a secondary winding in the second layer of winding structure, the second position of the first layer of winding structure is a position corresponding to the position of a primary winding in the second layer of winding structure, and the first layer of winding structure and the second layer of winding structure are two adjacent layers of winding structures. That is, for the adjacent two-layer winding structure, the primary winding at the outer layer covers the secondary winding at the inner layer, and the secondary winding at the outer layer covers the primary winding at the inner layer.

In another example, the frame includes a frame body having a plurality of side-by-side annular grooves formed around the frame body. And a connecting groove perpendicular to the annular grooves is arranged between every two adjacent annular grooves, two ends of the connecting groove are respectively connected with the two rows of annular grooves, the annular grooves are used as runways, and the connecting groove is used as an opening of the runways. The groove-shaped runway can provide a limiting effect, and the winding is loaded in the groove to achieve a stable effect.

< second embodiment >

Fig. 4(a) -4(b) are schematic structural diagrams of a transformer winding provided by a second embodiment of the present disclosure.

The second embodiment differs from the first embodiment in that: in a second embodiment, there is at least one primary winding distributed across the openings on different runways and at least one secondary winding distributed across the openings on different runways.

For example, referring to fig. 4(a) -4(b), the first turn P1 of the primary winding traverses from the first runway to the second runway at opening R1, returns from the second runway to the first runway at opening R2, and then begins the second turn P2. The first turn S1 of the secondary winding traverses from the fourth track to the third track at opening R1, returns from the third track to the fourth track at opening R2, and then begins the second turn S2.

The magnetic field distribution among the transformer windings of the embodiment is more uniform, so that the alternating current loss of the transformer windings is reduced.

< third embodiment >

Fig. 5 is a schematic structural diagram of a transformer winding provided by a third embodiment of the present disclosure.

The third embodiment is different from the first embodiment in that: in the third embodiment, the primary winding and the secondary winding are alternately distributed in the multi-turn winding in the same layer of winding structure.

For example, referring to fig. 5, in the first layer of winding structure, the first turn of winding is the first turn P1 of the primary winding, the second turn of winding is the second turn S2 of the secondary winding, the third turn of winding is the second turn P2 of the primary winding, and the fourth turn of winding is the first turn S1 of the secondary winding. In the second layer of winding structure, the first turn of winding is the fourth turn S4 of the secondary winding, the second turn of winding is the third turn P3 of the primary winding, the third turn of winding is the third turn S3 of the secondary winding, and the fourth turn of winding is the fourth turn P4 of the primary winding.

The magnetic field distribution among the transformer windings of the embodiment is more uniform, so that the alternating current loss of the transformer windings is further reduced.

< fourth embodiment >

Fig. 6(a) -6(b) are schematic structural diagrams of a transformer winding provided by a fourth embodiment of the present disclosure.

The fourth embodiment is different from the third embodiment in that: in the fourth embodiment, in the same layer of winding structure, the primary winding and the secondary winding are distributed on the same runway simultaneously through at least two openings on the same runway. That is, in the same layer of winding structure, at least one circle of primary winding is distributed on different runways through the opening, at least one circle of secondary winding is distributed on different runways through the opening, and the primary winding and the secondary winding are distributed on the same runway at the same time.

For example, referring to fig. 6(a) -6(b), in the first layer winding structure, one half turn of the first turn P1 of the primary winding is in the first racetrack, the other half turn of the first turn P1 of the primary winding is in the second racetrack, one half turn of the second turn S2 of the secondary winding is in the second racetrack, and the other half turn of the second turn S2 of the secondary winding is in the first racetrack. In the first layer of winding structure, the first track contains half of the first turn P1 of the primary winding and half of the second turn of the secondary winding S2, and the second track contains the other half of the first turn P1 of the primary winding and the other half of the second turn S2 of the secondary winding.

< fifth embodiment >

Fig. 7(a) -7(b) are schematic structural diagrams of a transformer winding provided by a fifth embodiment of the present disclosure.

The transformer comprises a magnetic core, a framework, a primary winding and a secondary winding. The framework is sleeved outside the magnetic core, a plurality of annular runways which are arranged in parallel are arranged on the framework, and openings are arranged on the runways. In one example, the openings of different runways may correspond to each other.

The left drawing of fig. 7(a) is a top view of the magnetic core and the framework, the framework is provided with 4 parallel runways, which are a first runway, a second runway, a third runway and a fourth runway in sequence, and each runway is provided with an opening R1, an opening R2, an opening R3 and an opening R4 at corresponding positions.

The right diagram of fig. 7(a) shows a schematic cross-sectional view of the first and second layer winding structures at position W1, a schematic cross-sectional view of the first and second layer winding structures at position W2, a schematic cross-sectional view of the first and second layer winding structures at position W3, and a schematic cross-sectional view of the first and second layer winding structures at position W4.

Referring to the right diagram of fig. 7(a) and fig. 7(b), the first layer winding structure and the second layer winding structure respectively include 4 turns of windings arranged in parallel, which are sequentially a first turn, a second turn, a third turn and a fourth turn, corresponding to the first runway, the second runway, the third runway and the fourth runway arranged in parallel. The first layer of winding structure comprises a first circle P1 and a second circle P2 of a primary winding, and a first circle S1 and a second circle S2 of a secondary winding. The second layer of winding structure comprises a third winding P3 and a fourth winding P4 of the primary winding, and a third winding S3 and a fourth winding S4 of the secondary winding.

In a fifth embodiment, there is at least one primary winding distributed across the openings on different runways and at least one secondary winding distributed across the openings on different runways.

For example, referring to fig. 7(a) -7(b), the first turn P1 of the primary winding traverses from the first runway to the second runway at opening R1, returns from the second runway to the first runway at opening R2, traverses from the first runway to the second runway at opening R3, returns from the second runway to the first runway at opening R4, and then begins the second turn P2. For example, the first turn S1 of the secondary winding traverses from the fourth track to the third track at opening R1, returns from the third track to the fourth track at opening R2, traverses from the fourth track to the third track at opening R3, returns from the third track to the fourth track at opening R4, and then begins the second turn S2.

< sixth embodiment >

Fig. 8(a) -8(b) are schematic structural diagrams of a transformer winding provided by a sixth embodiment of the present disclosure.

The sixth embodiment is different from the fifth embodiment in that: in the sixth embodiment, in the same layer of winding structure, the primary winding and the secondary winding are distributed on the same runway simultaneously through at least two openings on the same runway. That is, in the same layer of winding structure, at least one circle of primary winding is distributed on different runways through the opening, at least one circle of secondary winding is distributed on different runways through the opening, and the primary winding and the secondary winding are distributed on the same runway at the same time.

For example, referring to fig. 8(a) -8(b), in the first layer winding structure, the first turn P1 of the primary winding is distributed on a first track and a second track, the second turn S2 of the secondary winding is distributed on the first track and the second track, the first track contains two 1/4 turns of the first turn P1 of the primary winding and two 1/4 turns of the second turn of the secondary winding S2, and the second track contains two other 1/4 turns of the first turn P1 of the primary winding and two other 1/4 turns S2 of the second turn S2 of the secondary winding.

In the embodiment of the present disclosure, the primary winding and the secondary winding may be implemented by using a flexible circuit board. In the case of a flexible circuit board, the transformer may also be implemented using the aforementioned framework structure with a runway, and the primary winding and the secondary winding are distributed on the framework along the runway. Under the condition of realizing by adopting the flexible circuit board, the framework is not arranged, and the primary winding and the secondary winding are pasted on the magnetic core. Under the condition of adopting the flexible circuit board to realize, the framework can be not provided with a runway, and the flexible circuit board is pasted on the framework.

< seventh embodiment >

Fig. 9(a) -9(c) are schematic structural diagrams of a transformer winding provided by a seventh embodiment of the present disclosure.

The primary winding and the secondary winding are respectively realized by a strip-shaped flexible circuit board.

Referring to fig. 9(a), the flexible wiring board includes first cells and second cells arranged alternately in the longitudinal direction, that is, the flexible wiring board includes first cells, second cells, first cells, and second cells … … in this order. Of course, the flexible wiring board may include only one first unit and one second unit.

The first unit comprises a plurality of steps from low to high, and the second unit comprises a plurality of steps from high to low, wherein the length of the steps is equal to the length required by the half circle of the surrounding magnetic core.

The conductor circuit on the flexible circuit board extends along the length direction of the flexible circuit board and fluctuates along with the height change of the step, namely, the overall shape of the conductor circuit on the flexible circuit board is similar to that of the flexible circuit board.

Referring to fig. 9(b), the first unit includes 4 steps from low to high, and the second unit includes 4 steps from high to low, and two flexible wiring boards are arranged in opposite directions, crossing at the middle of the first unit and crossing at the middle of the second unit. And winding the flexible circuit board on the magnetic core from the head end of the flexible circuit board to form a multilayer winding structure, wherein each layer of winding structure comprises 4 turns of windings arranged in parallel. The coil condition and the turn of the winding corresponding to each step of the first unit and the second unit can be known by referring to the label in fig. 9(b), and details are not repeated here.

< eighth embodiment >

Fig. 10 is a schematic structural diagram of a transformer winding according to an eighth embodiment of the present disclosure.

The eighth embodiment is the same as the seventh embodiment, and description thereof will not be repeated, but the eighth embodiment differs from the seventh embodiment in that: in the eighth embodiment, the flexible printed circuit board is provided with a slit FX, and at least a middle portion of one step is provided with a slit extending along the length direction of the flexible printed circuit board, so that the conductor line is divided into two parallel sub-lines at the middle portion of the step.

<. ninth embodiment

The ninth embodiment is the same as the seventh embodiment and description thereof is not repeated, but the ninth embodiment is different from the seventh embodiment in that: at least two parallel lead lines are arranged at the middle section of one step and are combined into one lead line at the edge of the step. The ninth embodiment is similar in final circuit configuration to the seventh embodiment.

<. tenth embodiment

Fig. 11 is a schematic structural diagram of a transformer winding provided in a tenth embodiment of the present disclosure, which is a variation on the seventh embodiment.

In the tenth embodiment, the primary winding and the secondary winding are each implemented by using a strip-shaped flexible wiring board, as in the seventh embodiment. The flexible circuit board comprises a first unit and a second unit which are alternately arranged along the length direction, the first unit comprises 4 steps from low to high, the second unit comprises 4 steps from high to low, and the length of the steps is equal to the length required by the surrounding of the magnetic core half circle. The conductor circuit on the flexible circuit board extends along the length direction of the flexible circuit board and fluctuates along with the height change of the step, namely, the overall shape of the conductor circuit on the flexible circuit board is similar to that of the flexible circuit board.

Two flexible circuit boards are arranged together in opposite directions, and the two flexible circuit boards intersect at the middle of the first unit and intersect at the middle of the second unit. And winding the flexible circuit board on the magnetic core from the head end of the flexible circuit board to form a multilayer winding structure, wherein each layer of winding structure comprises 4 turns of windings arranged in parallel.

The difference from the seventh embodiment is that, in the tenth embodiment, each flexible wiring board is a double-layer wiring structure.

Along the length direction of the flexible circuit board, each layer of circuit structure comprises a head part, a middle part and a tail part, and the middle part of each layer of circuit structure comprises a first circuit 100 and a second circuit 200 which are parallel to each other.

The head of the top layer circuit structure is connected with the head of the bottom layer circuit structure, and the tail of the top layer circuit structure is connected with the tail of the bottom layer circuit structure. The head part and the middle part of the top layer circuit structure are connected, and the middle part and the tail part are connected. The head part and the middle part of the bottom layer circuit structure are connected, and the middle part and the tail part are connected.

The first wiring 100 includes a plurality of segments of first sub-wirings 101 separated from each other, and the second wiring 200 includes a plurality of segments of second sub-wirings 201 separated from each other, and the first sub-wirings 101 and the second sub-wirings 201 are aligned one by one.

The tail of the Mth first sub-line 101 of the top layer circuit structure is connected with the head of the Nth second sub-line 201 of the top layer circuit structure, the tail of the Mth second sub-line 201 of the bottom layer circuit structure is connected with the head of the Nth first sub-line 101 of the bottom layer circuit structure, wherein N is M +1, and M is larger than or equal to 1.

The head parts of the Lth first sub-line 101 of the top layer line structure and the Lth first sub-line 101 of the bottom layer line structure are interconnected through a through hole GK, and the tail parts of the first sub-line 101 and the bottom layer line structure are interconnected through a through hole GK.

The head parts of the Lth second sub-line 201 of the top layer line structure and the Lth second sub-line 201 of the bottom layer line structure are interconnected through a via hole GK, and the tail parts of the L second sub-line 201 of the top layer line structure and the L second sub-line 201 of the bottom layer line structure are interconnected through a via hole GK, wherein L is more than or equal to 1.

The embodiment of the disclosure also provides a charger, which comprises the transformer disclosed by any one of the embodiments.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A transformer is characterized by comprising a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are wound on the magnetic core;

the primary winding and the secondary winding jointly form a multilayer winding structure from the magnetic core to the outside;

the primary winding and the secondary winding in the same layer of winding structure form a plurality of turns of windings which are arranged in parallel;

the first position of the P-layer winding structure is a primary winding, the second position of the P-layer winding structure is a secondary winding, the first position is a position corresponding to the position of the secondary winding in the Q-layer winding structure, the second position is a position corresponding to the position of the primary winding in the Q-layer winding structure, and the P-layer winding structure and the Q-layer winding structure are of two adjacent layers of winding structures.

2. A transformer according to claim 1, characterized in that in one winding structure there are at least one different section of the primary winding distributed over at least two turns of the winding and/or at least one different section of the secondary winding distributed over at least two turns of the winding.

3. The transformer of claim 1, wherein at least one turn of the winding in one of the winding configurations comprises both a primary winding and a secondary winding.

4. A transformer according to any one of claims 1 to 3, characterised in that the primary winding and the secondary winding are implemented using flexible circuit boards.

5. The transformer according to claim 3, wherein the primary winding and the secondary winding are each implemented by a strip-shaped flexible circuit board;

the flexible circuit board comprises a first unit and a second unit which are alternately arranged along the length direction, the first unit comprises a plurality of steps from low to high, the second unit comprises a plurality of steps from high to low, and the length of the steps is equal to the length required by the magnetic core for surrounding a half circle;

and the lead circuit on the flexible circuit board extends along the length direction of the flexible circuit board and fluctuates along with the height of the step.

6. The transformer of claim 5, wherein a slit extending along the length direction of the flexible circuit board is formed at a middle position of at least one of the steps, so that the lead line is divided into two parallel sub-lines at the middle position of the step; alternatively, the first and second electrodes may be,

at least two parallel lead lines are arranged at the middle section of one step, and the two parallel lead lines are combined into one lead line at the edge position of the step.

7. The transformer of claim 5, wherein the flexible circuit board has a double-layer circuit structure;

along the length direction of the flexible circuit board, each layer of circuit structure comprises a head part, a middle part and a tail part, and the middle part of each layer of circuit structure comprises a first circuit and a second circuit which are parallel to each other;

the first line comprises a plurality of mutually separated first sub-lines, the second line comprises a plurality of mutually separated second sub-lines, and the first sub-lines and the second sub-lines are aligned one by one;

the tail part of the Mth first sub-line of the top layer line structure is connected with the head part of the Nth second sub-line of the top layer line structure, the tail part of the Mth second sub-line of the bottom layer line structure is connected with the head part of the Nth first sub-line of the bottom layer line structure, wherein N is M +1, and M is more than or equal to 1;

the head part of the L-th first sub-line of the top layer line structure is interconnected with the head part of the L-th first sub-line of the bottom layer line structure through a through hole, and the tail part of the L-th first sub-line of the top layer line structure is interconnected through a through hole;

the head part of the L-th second sub-line of the top layer line structure is interconnected with the head part of the L-th second sub-line of the bottom layer line structure through a through hole, and the tail part of the L-th second sub-line of the top layer line structure is interconnected through a through hole, wherein L is more than or equal to 1;

the head of the top layer circuit structure is connected with the head of the bottom layer circuit structure, and the tail of the top layer circuit structure is connected with the tail of the bottom layer circuit structure.

8. A transformer is characterized by comprising a magnetic core, a framework, a primary winding and a secondary winding;

the framework is sleeved outside the magnetic core, the framework is provided with a plurality of annular runways which are arranged in parallel, and the runways are provided with openings;

the primary winding and the secondary winding are distributed on the framework along the runway and form a multilayer winding structure outwards from the framework;

the primary winding is distributed in each layer of winding structure through the opening, and the secondary winding is distributed in each layer of winding structure through the opening;

9. The transformer according to claim 8, wherein the race track is provided with at least two openings;

in the same layer of winding structure, at least one circle of primary winding is distributed on different runways through the opening, and/or at least one circle of secondary winding is distributed on different runways through the opening.

10. The transformer according to claim 8, wherein the primary winding and the secondary winding are distributed on the same runway simultaneously through at least two openings on the same runway in the same layer winding structure.

11. The transformer according to any one of claims 8 to 10, wherein the runways are grooves or raised baffles.

12. A charger, characterized in that it comprises a transformer according to any one of claims 1-11.