High-frequency and high-voltage transformer and insulation structure

Abstract

According to the high-frequency and high-voltage transformer and the insulation structure, vacuum pouring epoxy resin insulation paste is adopted on the outer wall of a litz wire, so that the vacuum pouring epoxy resin insulation paste is cured under the heating condition, excellent electromechanical performance can be obtained, and particularly, the high-frequency and high-voltage transformer has excellent toughness, high heat conduction performance and non-toxicity and flame retardance (halogen-free, phosphorus-free and nitrogen-free); the method can meet the stress cracking resistance requirement of an encapsulation insert of an electromechanical insulation product, and is recommended to be used for producing various medium-high voltage insulation products. The high-voltage coil is reasonable in design, the high-voltage coil structure comprises a plurality of litz wires, the outer walls of the plurality of litz wires are provided with the low-resistance tape, the outer wall of the low-resistance tape is provided with the mica tape, and the outer wall of the mica tape is provided with the epoxy potting layer.

Description

Technical Field

[0001] The present invention mainly relates to the field of high-frequency and high-voltage transformers, and in particular to a high-frequency and high-voltage transformer and an insulation structure. Background Art

[0002] High-voltage and high-frequency transformers are core components used in AC-AC / DC-AC / DC-DC power converters with high power (greater than 10kW), high voltage (greater than 10kV), and high frequency (greater than 5kHz). They are mainly used in data center power supplies, smart grids, and super charging stations. Data centers are global collaborative networks of specific devices used to transmit, accelerate, display, calculate, and store data information on the Internet infrastructure. Most electronic components in data centers are driven by low DC power supplies, and can also be used in smart grids and super charging stations, which also require the use of high-frequency and high-voltage transformers; Computers in data centers, smart grids and supercharging stations require high-frequency and high-voltage transformers to power the computers during operation.

[0003] The inventor discovered the following defects during the operation of the specific embodiment: However, when current flows in the high-voltage and high-frequency transformer, the insulation layer on the outer wall of the high-voltage coil inside the high-voltage and high-frequency transformer has poor heat dissipation effect, which will cause the high-voltage coil inside the high-voltage and high-frequency transformer to overheat, resulting in voltage failure or short-term breakdown between the high-voltage and low-voltage of the product and the outer casing. It is also easy to cause local quantity to exceed the standard, resulting in a shortened life of the high-frequency and high-voltage transformer.

[0004] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Summary of the invention

[0005] 1. Technical problem to be solved by the invention: The present invention provides a high-frequency and high-voltage transformer and an insulation structure, which are used to solve the technical problems existing in the above-mentioned background technology.

[0006] 2. Technical solution: To achieve the above object, the technical solution provided by the present invention is: a high-frequency high-voltage transformer and an insulation structure, comprising an iron core, a high-voltage coil structure is arranged inside the iron core, mounting grooves are provided at both ends of the high-voltage coil structure, a low-voltage coil is arranged inside the mounting groove, an shed is provided on one side of the high-voltage coil structure, and an interface is provided at one end; A high-voltage coil structure includes a plurality of Litz wires, the outer walls of the plurality of Litz wires are provided with low-resistance tapes, an inner shielding layer is provided between the Litz wires and the low-resistance tapes, the outer walls of the low-resistance tapes are provided with mica tapes, the outer walls of the mica tapes are provided with epoxy potting layers, and the outer walls of the epoxy potting layers are provided with semi-conductive tapes.

[0007] Furthermore, the outer wall of the Litz wire is made of vacuum cast epoxy resin insulation glue.

[0008] Furthermore, a high-frequency high-voltage transformer is realized by using any one of the insulating structures described above, comprising a mounting frame, mounting holes are opened on both sides of the mounting frame, a mounting plate is arranged on one side of the mounting frame, and iron cores are arranged on both sides of the inner wall of the mounting frame.

[0009] Furthermore, the number of the iron cores is set to two, the iron cores are set to be in a mountain shape, and the two iron cores are fitted to each other.

[0010] Furthermore, the middle of the iron core passes through the interior of the low-voltage coil and the high-voltage coil structure.

[0011] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention uses vacuum casting epoxy resin insulation glue on the outer wall of the Litz wire, and makes the vacuum casting epoxy resin insulation glue solidify under heating conditions, so as to obtain excellent electromechanical properties, especially excellent toughness, high thermal conductivity and non-toxic flame retardancy (halogen-free, phosphorus-free, nitrogen-free), which can meet the stress cracking resistance requirements of the encapsulated inserts of electromechanical insulation products, and is recommended for the production of various medium and high voltage insulation products; Low-voltage coils are arranged on the top and bottom of the high-voltage coil. The high-voltage coil is insulated by vacuum-cast epoxy resin insulating glue. First, Litz wire is wound, and then vacuum-cast epoxy resin insulating glue is used for insulation. Then internal shielding is done, and then vacuum casting is done. Then, it is heated and cured twice. After curing, the surface is sandblasted. The surface of the high-voltage coil is then treated with a low-resistance band, and the low-resistance band is set into two groups, inner and outer. The outer low-resistance band is connected to the mounting frame through a wire, and finally assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the structure of the mounting frame of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the iron core of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the low-voltage coil of the present invention; Figure 5It is a three-dimensional structural schematic diagram of the high-voltage coil structure of the present invention; Figure 6 It is a schematic diagram of the front cross-section structure of the high-voltage coil structure of the present invention; Figure 7 Parameter table of the present invention Figure 8 It is a temperature curve diagram of the present invention; Fig. 9 It is the gel time curve diagram of the present invention; Fig.10 This is a graph of epoxy resin specifications of the present invention.

[0013] Reference numerals: 1. Mounting frame; 2. Mounting hole; 3. Mounting plate; 4. Iron core; 5. High-voltage coil structure; 501. Litz wire; 502. Low-resistance tape; 503. Mica tape; 504. Epoxy potting layer; 6. Mounting groove; 7. Low-voltage coil; 8. Umbrella skirt; 9. Interface. DETAILED DESCRIPTION

[0014] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0018] See attached Figure 1-6 A high-frequency high-voltage transformer and insulation structure, comprising an iron core 4, a high-voltage coil structure 5 is arranged inside the iron core 4, mounting grooves 6 are provided at both ends of the high-voltage coil structure 5, a low-voltage coil 7 is arranged inside the mounting groove 6, an shed 8 is arranged on one side of the high-voltage coil structure 5, an interface 9 is arranged at one end of the shed 8, and the power of the shed 8 is mainly to increase the creepage distance, reduce the product size, and increase the power density of the product; The high-voltage coil structure 5 includes a plurality of Litz wires 501, wherein the outer walls of the plurality of Litz wires 501 are provided with low-resistance tapes 502, an inner shielding layer is provided between the Litz wires 501 and the low-resistance tapes 502, a mica tape 503 is provided on the outer wall of the low-resistance tapes 502, an epoxy potting layer 504 is provided on the outer wall of the mica tape 503, a semi-conductive tape is provided on the outer wall of the epoxy potting layer 504, the outer wall of the Litz wire 501 is vacuum-cast epoxy resin insulating glue, the Litz wire 501 is wound, and then vacuum-cast epoxy resin is used. The resin insulating glue is used to insulate the Litz wire 501, and then the inner shield is made and the copper foil is used to make a grid on the surface of the cast epoxy resin insulating glue on the outer wall of the Litz wire 501. The thickness of the mica tape 503 is greater than 3mm, and the vacuum pressure is dipped twice. Finally, the epoxy potting layer 504 is vacuum cast. The Litz wire 501 is twisted by multiple strands of fine insulating wires. The epoxy potting layer 504 is also wrapped with a layer of low-resistance tape 502. The inner and outer layers of low-resistance tape 502 constitute the inner and outer shielding layers. The outer low-resistance tape 502 is grounded and connected to the mounting frame 1 through a wire. The diameter of a single strand of Litz wire 501 is generally 0.05-0.25mm, and it is made of 10-3000 insulated wires twisted together according to the power and current it carries; The casting epoxy resin insulation glue of the outer wall of Litz wire 501 has the following performance parameters: Figure 7 As shown; The viscosity-temperature curve of the cast epoxy resin insulation glue on the outer wall of Litz wire 501 is as follows Figure 8 As shown, the gel-temperature curve is Fig. 9 As shown; The specifications of the pouring epoxy resin insulation glue for the outer wall of Litz wire 501 are as follows Fig.10 shown.

[0019] Furthermore, a high-frequency high-voltage transformer is implemented using an insulating structure described in any one of the above, including a mounting frame 1, mounting holes 2 are opened on both sides of the mounting frame 1, a mounting plate 3 is provided on one side of the mounting frame 1, iron cores 4 are provided on both sides of the inner wall of the mounting frame 1, the number of the iron cores 4 is set to two, the iron cores 4 are set to a mountain shape, the two iron cores 4 are fitted to each other, the middle of the iron core 4 passes through the interior of the low-voltage coil 7 and the high-voltage coil structure 5, the low-voltage coil 7 is installed on the inner walls of the mounting grooves 6 on both sides of the high-voltage coil structure 5, and the middle of the iron core 4 passes through the high-voltage coil structure 5.

[0020] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An insulation structure, characterized in that: include An iron core (4), wherein a high-voltage coil structure (5) is arranged inside the iron core (4), installation grooves (6) are provided at both ends of the high-voltage coil structure (5), a low-voltage coil (7) is arranged inside the installation groove (6), an shed (8) is arranged on one side of the high-voltage coil structure (5), and an interface (9) is arranged at one end of the (8); A high-voltage coil structure (5) comprises a plurality of Litz wires (501), the outer walls of the plurality of Litz wires (501) being provided with a low-resistance tape (502), an inner shielding layer being provided between the Litz wires (501) and the low-resistance tape (502), the outer wall of the low-resistance tape (502) being provided with a mica tape (503), the outer wall of the mica tape (503) being provided with an epoxy potting layer (504), and the outer wall of the epoxy potting layer (504) being provided with a semi-conductive tape.

2. An insulation structure according to claim 1, characterized in that: The outer wall of the Litz wire (501) is made of vacuum cast epoxy resin insulation glue.

3. A high-frequency high-voltage transformer, which is realized by using an insulating structure as described in any one of claims 1 to 2, and its characteristics are: comprising a mounting frame (1), mounting holes (2) are opened on both sides of the mounting frame (1), a mounting plate (3) is arranged on one side of the mounting frame (1), and iron cores (4) are arranged on both sides of the inner wall of the mounting frame (1).

4. A high frequency and high voltage transformer according to claim 1, characterized in that: The number of the iron cores (4) is set to two, the iron cores (4) are set to be in a mountain shape, and the two iron cores (4) are fitted together.

5. The high-frequency high-voltage transformer according to claim 1, characterized in that: The middle of the iron core (4) passes through the interior of the low-voltage coil (7) and the high-voltage coil structure (5).

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