LLC transformer

Abstract

The utility model discloses an LLC transformer which comprises a first magnetic core and a second magnetic core arranged at the upper end of the first magnetic core in a covering mode, a containing cavity is formed between the first magnetic core and the second magnetic core, and a primary winding and a secondary winding are arranged in the containing cavity. A framework is arranged in the containing cavity and comprises a base and a bottom plate arranged at the lower end of the base in a covering mode, an installation cavity is formed between the bottom plate and the base, the primary winding is installed in the installation cavity, a positioning groove is formed in the upper end of the base in a downward concave mode, and a magnetic sheet is arranged in the positioning groove. An opening in the upper end of the positioning groove is covered with a spacing cover plate, and the secondary winding is stacked at the upper end of the spacing cover plate; therefore, the magnitude of the leakage inductance of the transformer can be adjusted through the magnetic sheets, a resonant inductor winding does not need to be additionally and independently arranged, the occupied space of the resonant inductor winding can be saved, the space utilization rate is high, the overall size of the LLC transformer is further reduced, and miniaturization of the LLC transformer is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer field technology especially is LLC transformer. BACKGROUND

[0002] With the progress of human science and technology and the development of electronic technology, more and more electronic equipment needs to use transformer, wherein LLC transformer has incomparable advantage compared with ordinary transformer, so it is widely used, for example, the vehicle charger composed of LLC transformer is the core component of electric automobile electric energy conversion. LLC transformer is mostly composed of resonant inductance winding and transformer, and the resonant inductance winding and transformer are two independent devices.

[0003] In the prior art LLC transformer, since the transformer and the resonant inductance are two completely independent components, the overall occupies a large space on the whole machine power supply, and the power supply is large in size and high in cost, and the resonant inductance uses the leakage inductance of the transformer, and the desired resonant inductance parameter cannot be accurately and effectively obtained when debugging the leakage inductance. Due to the limitation of product structure, the leakage inductance debugging is also limited, and the leakage inductance of the transformer cannot meet the demand of the resonant inductance.

[0004] Therefore, it is necessary to research a new technology to solve the above problems. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides an LLC transformer, which can adjust the size of the leakage inductance of the transformer through the magnetic sheet, does not need to additionally set the resonant inductance winding, can save the occupied space of the resonant inductance winding, is high in space utilization, thereby reducing the overall size of the LLC transformer, and is beneficial to the miniaturization of the LLC transformer.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An LLC transformer, comprising a first magnetic core and a second magnetic core arranged on the upper end of the first magnetic core, a containing cavity is formed between the first magnetic core and the second magnetic core, a primary winding and a secondary winding are arranged in the containing cavity; a framework is arranged in the containing cavity, the framework comprises a base and a bottom plate arranged on the lower end of the base, a mounting cavity is formed between the bottom plate and the base, the primary winding is arranged in the mounting cavity, a positioning groove is concavely arranged on the upper end of the base, a magnetic sheet is arranged in the positioning groove, and a spacing cover plate is arranged on the upper end opening of the positioning groove, and the secondary winding is arranged on the upper end of the spacing cover plate.

[0008] As a preferred scheme, the magnetic sheet comprises a first magnetic body and a second magnetic body, the first magnetic body and the second magnetic body are arranged in a symmetrical manner, and the first magnetic body and the second magnetic body are respectively provided with the spacing cover plate.

[0009] As a preferred scheme, the first gasket is arranged between the primary winding and the bottom plate.

[0010] As a preferred scheme, the second gasket is arranged between the secondary winding and the spacing cover plate.

[0011] As a preferred scheme, the third gasket is arranged between the secondary winding and the second magnetic core.

[0012] As a preferred scheme, the base is in a circular structure, the base comprises a circular base plate and an arc-shaped side plate part integrally extended downward from the lower end edge of the base plate, a ring-shaped column part is integrally extended downward from the middle part of the lower end of the base plate, the mounting cavity is formed between the upper surface of the bottom plate, the inner circumferential side wall of the side plate part and the outer circumferential side wall of the column part, and the primary winding is wound on the column part.

[0013] As a preferred scheme, the positioning groove is concave downward from the upper surface of the base plate and in a ring-shaped structure, and the magnetic sheet is in an arc-shaped structure.

[0014] As a preferred scheme, the side plate part has a side opening, the outgoing line of the primary winding passes through the side opening and passes through the wire hole on the bottom plate downward.

[0015] As a preferred scheme, the first magnetic core is provided with a magnetic column, the magnetic column sequentially passes through the bottom plate, the primary winding, the base, the secondary winding and abuts against the lower surface of the second magnetic core.

[0016] The utility model discloses an improved transformer, which has obvious advantages and beneficial effects compared with the prior art. Specifically, the improved transformer comprises a skeleton, a primary winding, a secondary winding, a magnetic sheet, and a spacer cover. The skeleton is arranged in a receiving cavity and comprises a base and a bottom plate arranged at the lower end of the base. The primary winding is arranged in an installation cavity formed between the bottom plate and the base. The base is concave downward at the upper end and has a positioning groove. The magnetic sheet is arranged in the positioning groove. The secondary winding is arranged on the upper end of the spacer cover. The magnetic sheet is arranged between the primary winding and the secondary winding. The size of the leakage inductance of the transformer can be adjusted by the magnetic sheet. The adjusted leakage inductance serves as the resonance inductance to cooperate with the transformer operation. The desired resonance inductance parameter is obtained. The leakage inductance value can be effectively controlled by changing the size, shape, and material of the magnetic sheet according to the desired resonance inductance parameter. The leakage inductance parameter debugging limited by the transformer body design is satisfied. The resonance inductance winding does not need to be separately arranged. The occupied space of the resonance inductance winding is saved. The space utilization rate is high. The overall volume of the LLC transformer is reduced. The miniaturization of the LLC transformer is facilitated. The power supply volume is reduced. The cost is reduced. The power supply density space is more compact. The efficiency is higher.

[0017] To make the structure, technical means, and specific purposes and functions of the utility model clearer, the utility model will be further described in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall structure of the embodiment of the utility model stereogram schematic diagram;

[0019] Figure 2 is another angle overall structure of the embodiment of the utility model stereogram schematic diagram;

[0020] Figure 3 is the cross section of the embodiment of the utility model;

[0021] Figure 4 is the exploded view of the embodiment of the utility model;

[0022] Figure 5 is another exploded view of the embodiment of the utility model;

[0023] Figure 6 is yet another exploded view of the embodiment of the utility model.

[0024] Explanation of the attached drawings:

[0025] 10, first magnetic core 11, receiving cavity

[0026] 12, magnetic column 20, second magnetic core

[0027] 30, primary winding 40, secondary winding

[0028] 41, second connecting hole 50, skeleton

[0029] 51, base 511, positioning groove

[0030] 512, base plate 513, side plate part

[0031] 514, column part 515, side opening

[0032] 52, bottom plate 521, wire hole

[0033] 522, first connecting hole 53, mounting cavity

[0034] 60, magnetic sheet 61, first magnetic body

[0035] 62, second magnetic body 70, spacing cover plate

[0036] 80, first gasket 90, second gasket

[0037] 101, third gasket 102, connecting piece DETAILED DESCRIPTION

[0038] Please refer to Figures 1 to 6 , which shows the specific structure of the embodiment of the present application.

[0039] The utility model provides a kind of LLC transformer, including first magnetic core 10 and the second magnetic core 20 of cover end of first magnetic core 10, the cavity 11 is formed between the first magnetic core 10 with second magnetic core 20, and primary winding 30 and secondary winding 40 are equipped in the cavity 11;The skeleton 50 is equipped in the cavity 11, and the skeleton 50 includes base 51 and bottom plate 52 of cover lower end of base 51, and the mounting cavity 53 is formed between bottom plate 52 with base 51, and primary winding 30 is installed in mounting cavity 53, and first gasket 80 is equipped between primary winding 30 with bottom plate 52, and the upper end of base 51 is concave and is equipped with positioning groove 511, and the positioning groove 511 is equipped with magnetic sheet 60, and the upper end opening of positioning groove 511 is detachably equipped with a spacing cover plate 70, and secondary winding 40 is stacked on the upper end of spacing cover plate 70, and second gasket 90 is equipped between secondary winding 40 with spacing cover plate 70, and third gasket 101 is equipped between secondary winding 40 with second magnetic core 20.Here, magnetic sheet 60 is placed into base 51 to control the leakage inductance of transformer, so that desired resonant inductance parameter is obtained, so that leakage inductance value can be effectively controlled according to desired resonant inductance parameter by changing the size, shape and material of magnetic sheet 60, to meet the leakage inductance parameter debugging limited due to transformer body design reason.And base 51 and bottom plate 52 are designed as a skeleton 50 combination, and primary winding 30 and magnetic sheet 60 are assembled in skeleton 50 respectively and are separated by base 51, form two completely insulated single bodies, and by the combination design of first gasket 80, second gasket 90 and third gasket 101, first magnetic core 10, primary winding 30, magnetic sheet 60, secondary winding 40 and second magnetic core 20 are sequentially and independently separated, so that they are all independent insulators, and the product has absolute guarantee in safety and reliability.

[0040] In the embodiment, the base 51 is circular structure, the base 51 includes circular base plate 512 and arc-shaped side plate part 513 integrally extended downward from the lower end edge of base plate 512, the annular column part 514 is integrally extended downward from the lower end middle part of base plate 512, the mounting cavity 53 is formed between the upper surface of bottom plate 52, the inner peripheral side wall of side plate part 513 and the outer peripheral side wall of column part 514, the primary winding 30 is wound on the column part 514, and the second gasket 90 completely covers the upper end of base plate 512.

[0041] In the embodiment, the positioning groove 511 is concave downward from the upper surface of the base plate 512 and has a ring structure, and the magnetic sheet 60 has an arc structure; specifically, in the embodiment, the magnetic sheet 60 includes a first magnetic body 61 and a second magnetic body 62, both of which have an arc structure and are symmetrically arranged on both sides of the positioning groove 511; the first magnetic body 61 and the second magnetic body 62 are symmetrically arranged, and the spacing cover plate 70 is arranged on the first magnetic body 61 and the second magnetic body 62, respectively, to cover the two magnetic bodies, respectively; and the spacing cover plate 70 has an arc structure.

[0042] In the embodiment, the side plate part 513 has a side opening 515, and the outgoing line of the primary winding 30 passes through the side opening 515 and then passes through the wire hole 521 on the bottom plate 52 downward, so that the primary winding 30 can smoothly pass out of the line.

[0043] In the embodiment, the first magnetic core 10 is provided with a magnetic column 12, which sequentially passes through the bottom plate 52, the first gasket 80, the primary winding 30, the base 51, the second gasket 90, the secondary winding 40, the third gasket 101, and abuts against the lower surface of the second magnetic core 20, and the magnetic column 12 passes through the column part 514.

[0044] In addition, in the embodiment, the two sides of the bottom plate 52 extend outside the two sides of the accommodating cavity 11, and the two sides of the bottom plate 52 are each provided with a first connecting hole 522, one side of the secondary winding 40 is provided with a second connecting hole 41, and the second connecting hole 41 is connected to the corresponding first connecting hole 522 through a connecting piece 102.

[0045] In summary, the design of the utility model focuses on that a skeleton is arranged in the accommodating cavity, the skeleton includes a base and a bottom plate arranged at the lower end of the base, an installation cavity is formed between the bottom plate and the base, the primary winding is installed in the installation cavity, a positioning groove is concave downward at the upper end of the base, a magnetic sheet is arranged in the positioning groove, a spacing cover plate is arranged at the opening of the upper end of the positioning groove, and the secondary winding is arranged on the upper end of the spacing cover plate. In this way, the magnetic sheet can be embedded between the primary winding and the secondary winding, the size of the leakage inductance of the transformer can be adjusted through the magnetic sheet, the adjusted leakage inductance serves as the resonance inductance, the transformer works in cooperation, the desired resonance inductance parameter is obtained, the leakage inductance value can be effectively controlled by changing the size, shape and material of the magnetic sheet according to the desired resonance inductance parameter, the leakage inductance parameter debugging limited by the design of the transformer body is met, and a resonance inductance winding does not need to be additionally arranged separately, so that the occupied space of the resonance inductance winding can be saved, the space utilization rate is high, the overall volume of the LLC transformer is reduced, the miniaturization of the LLC transformer is facilitated, the volume of the power supply can be reduced, the cost is reduced, the power supply density space is more compact, and the efficiency is higher.

[0046] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application. Any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A LLC transformer, comprising a first magnetic core and a second magnetic core arranged on the upper end of the first magnetic core, a receiving cavity is formed between the first magnetic core and the second magnetic core, a primary winding and a secondary winding are arranged in the receiving cavity; characterized in that: The accommodating cavity is provided with a framework, the framework comprises a base and a bottom plate arranged at the lower end of the base, a mounting cavity is formed between the bottom plate and the base, the primary winding is arranged in the mounting cavity, a positioning groove is concavely arranged at the upper end of the base, a magnetic sheet is arranged in the positioning groove, a spacing cover plate is arranged at the opening of the upper end of the positioning groove, and the secondary winding is arranged on the upper end of the spacing cover plate.

2. An LLC transformer according to claim 1, characterized in that: The magnetic sheet comprises a first magnetic body and a second magnetic body, the first magnetic body and the second magnetic body are symmetrically arranged, and the spacing cover plate is arranged corresponding to the first magnetic body and the second magnetic body.

3. The LLC transformer of claim 1, wherein: The primary winding is provided with a first gasket between the primary winding and the bottom plate.

4. The LLC transformer of claim 1, wherein: The secondary winding is provided with a second gasket between the secondary winding and the spacing cover plate.

5. The LLC transformer of claim 1, wherein: The secondary winding is provided with a third gasket between the secondary winding and the second magnetic core.

6. The LLC transformer of claim 1, wherein: The base is in a circular structure, the base comprises a circular base plate and an arc-shaped side plate part integrally extended downward from the lower end edge of the base plate, a cylindrical part is integrally extended downward from the middle part of the lower end of the base plate, the mounting cavity is formed between the upper surface of the bottom plate, the inner circumferential side wall of the side plate part and the outer circumferential side wall of the cylindrical part, and the primary winding is arranged on the cylindrical part.

7. An LLC transformer according to claim 6, characterized in that: The positioning groove is concavely arranged from the upper surface of the base plate and in a ring structure, and the magnetic sheet is in an arc structure.

8. The LLC transformer of claim 6, wherein: The side plate part has a side opening, the outgoing line of the primary winding passes through the side opening and passes through the wire hole on the bottom plate downward.

9. The LLC transformer of claim 1, wherein: The first magnetic core is provided with a magnetic column, the magnetic column sequentially passes through the bottom plate, the primary winding, the base and the secondary winding and abuts against the lower surface of the second magnetic core.

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