High-voltage-resistant pulse transformer

Abstract

The high-voltage-resistant pulse transformer comprises a framework, a manganese-copper enameled wire and a magnetic core, two annular grooves are formed in the framework, a plurality of pins are arranged at the bottoms of the two ends of the framework, through holes located in the two annular grooves are formed in the framework, and copper wires are wound on the two annular grooves respectively to form a primary winding and a secondary winding. The magnetic cores are in two square shapes, butt joint columns are arranged in the middles of the magnetic cores, two symmetrical containing grooves are formed in the two sides of each butt joint column, the two butt joint columns penetrate into the framework from the two ends of each through hole and then are in butt joint, the four containing grooves are clamped into the framework and cover the primary winding and the secondary winding, and the two magnetic cores are wound and fixed through high-temperature adhesive tape after being in butt joint. According to the pulse transformer, the two windings are wound by the double annular grooves respectively, and the optimal positions of the windings are adjusted in the two grooves, so that the two windings are physically isolated, the insulation distance is increased, and the high-voltage resistance of the pulse transformer can be greatly improved.

Description

Technical Field

[0001] The utility model relates to a high-voltage resistant pulse transformer, belonging to the technical field of pulse transformers. Background Art

[0002] The XECJPTEE5-1-1 pulse transformer uses the principle of magnetic induction to achieve voltage conversion. The input current is a periodic pulse signal, and the output outputs a periodic pulse signal different from the input signal. The input signal passes through one coil, generating a varying magnetic field, which in turn induces a varying AC signal in the other coil. Due to the periodicity of the pulse signal, the output voltage also exhibits periodic variations.

[0003] The XECJPTEE5-1-1 pulse transformer is a 1:1 primary-to-secondary isolated pulse transformer. It converts pulse signals input from the primary and secondary windings to the secondary windings while providing strong primary-to-secondary insulation. It features miniaturization, high withstand voltage, and low loss, and is used for MOS transistor drive isolation. It primarily implements precise control in circuits, provides drive voltage, and delivers stable operating current.

[0004] The XECJPTEE5-1-1 pulse transformer's high-voltage design requires the primary and secondary windings to withstand a 6000V pulse high voltage with a period of 1.5ms. During the manufacturing process, the inventors discovered that using a single-slot wound winding made it difficult to meet the required high-voltage resistance. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a high-voltage resistant pulse transformer which can meet the high-voltage resistant requirement.

[0006] The technical solution adopted by the present invention is: A high-voltage resistant pulse transformer, including a skeleton, manganese-copper enameled wire and a magnetic core, two annular grooves are provided on the skeleton, and a plurality of pins are provided at the bottom of both ends, and the skeleton is provided with through holes located in the two annular grooves, and the manganese-copper enameled wires are wound around the two annular grooves to form a primary winding and a secondary winding. The magnetic core adopts two E-shaped magnetic cores, a docking post is provided in the middle, and two symmetrical accommodating grooves are provided on both sides of the docking post. The two docking posts are inserted from both ends of the through hole and docked, and the four accommodating grooves are inserted into the skeleton and cover the primary winding and the secondary winding. After the two magnetic cores are docked, they are fixed with high-temperature tape.

[0007] Furthermore, the above-mentioned primary winding and secondary winding are fixed by gluing epoxy resin with an insulation strength of 15KV / mm. After the primary winding and secondary winding are glued, a circle of epoxy resin layer is formed on the outside. The epoxy resin layer is lower than the height of the annular groove. After gluing and fixing, a high-temperature tape layer is wrapped around the outside.

[0008] Furthermore, two strip-shaped bosses are downwardly provided at the bottoms of both ends of the frame, and the two strip-shaped bosses are provided with notches.

[0009] Furthermore, the magnetic core is a ferrite core, and the surface of the magnetic core is coated with epoxy resin to form an epoxy resin layer, and the butting surfaces of the two magnetic cores are not coated with the epoxy resin layer.

[0010] Furthermore, the above-mentioned high-voltage pulse transformer also includes a shell cover, which is stuck on the top of the frame.

[0011] Beneficial effects of the present invention: Compared with the prior art, the present invention adopts double annular grooves to wind two windings respectively, and adjusts the optimal position of the windings in the two grooves to achieve physical isolation of the two windings, increase the insulation distance, and greatly improve the high-voltage resistance performance of the pulse transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of a pulse transformer;

[0013] Figure 2 This is a schematic diagram of the pulse transformer's front view structure;

[0014] Figure 3 It is a schematic diagram of the three-dimensional structure of the skeleton;

[0015] Figure 4 is a schematic diagram of the magnetic structure;

[0016] Figure 5 1. It is a schematic diagram of the three-dimensional structure of the shell cover;

[0017] Figure 6 This is the electrical schematic diagram of the pulse transformer;

[0018] Figure 7 It is a schematic diagram of the preparation method. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: Figure 1-7 A high-voltage pulse transformer includes a skeleton 1, a manganese-copper enameled wire 2 and a magnetic core 3. Two annular grooves 4 are provided on the skeleton 1, and a plurality of pins 5 are provided at the bottom of both ends. The skeleton 1 is provided with a through hole 8 located in the two annular grooves 4. The manganese-copper enameled wire 2 is wound around the two annular grooves 4 to form a primary winding and a secondary winding. The magnetic core 3 adopts two E-shaped magnetic cores, a docking column 6 is provided in the middle, and two symmetrical receiving grooves 7 are provided on both sides of the docking column 6. The two docking columns 6 are inserted from both ends of the through hole 8 and docked. The four receiving grooves 7 are snapped into the skeleton 1 and cover the primary winding and the secondary winding. After the two magnetic cores 3 are docked, they are fixed with high-temperature tape 9.

[0021] In order to improve the high-voltage resistance of the pulse transformer, the primary and secondary windings are fixed with epoxy resin with an insulation strength of 15kV / mm. After the primary and secondary windings are fixed with epoxy resin, a circle of epoxy resin layer is formed on the outside. The epoxy resin layer is lower than the height of the annular groove. After the fixing with glue, a high-temperature tape layer is wrapped around the outside, which can meet the requirements of the primary and secondary windings to withstand 6000V, 1.5ms period pulse high voltage, thereby increasing insulation and reliability.

[0022] In order to facilitate the installation of pins and the connection of winding leads to the pins, two strip bosses 10 are set downward at the bottom of both ends of the skeleton 1. The strip bosses 10 are used to install the pins. The two strip bosses 10 are provided with notches. The leads pass through the notches and are wrapped around the pins to avoid the leads being affected after the pulse transformer is installed.

[0023] A high-voltage resistant pulse transformer also includes a shell cover 11, which is stuck on the top of the skeleton 1, and can protect the exposed skeleton and winding on the top of the pulse transformer, thereby improving the stability and safety of the pulse transformer. A card slot 14 and a card hole 15 on both sides of the card slot 14 are provided at both ends of the shell cover 11. A limit platform 12 and a card platform 13 are provided on the top of both ends of the skeleton 1. The card platform 13 is located on both sides of the limit platform 12. The card platform 13 can be stuck in the card hole 15, and the card slot 14 is stuck on the limit platform 12. This structure can realize the reliable installation of the shell cover 11.

[0024] Furthermore, the above-mentioned magnetic core 3 adopts a ferrite core, and the surface of the magnetic core 3 is coated with epoxy resin to form an epoxy resin layer, and the mating surfaces of the two magnetic cores 3 are not coated with the epoxy resin layer. Since the ferrite core is a conductor, the insulation property is poor; in order to increase the insulation property of the magnetic core, the magnetic core adopts an epoxy resin-coated core to increase the insulation between the magnetic core and the winding, thereby further improving the high voltage resistance performance.

[0025] Example 2: A method for preparing a high-voltage pulse transformer, the method comprising the following steps:

[0026] 1) Winding: Wind the manganese copper enameled wire on the frame to form the primary winding and secondary winding, and weld the free ends of the primary winding and secondary winding to the pins on the corresponding side respectively;

[0027] 2) Glueing: Use epoxy resin with an insulation strength of 15KV / mm to fix the primary and secondary windings;

[0028] 3) Welding: The free ends of the primary winding and the secondary winding are welded to the corresponding pins;

[0029] 4) Assembly: First, wrap the primary and secondary windings of the welded product with tape, then reinforce the two cores with glue after they are connected, then assemble the shell cover and reinforce it with glue again, and finally wrap it with high-temperature tape;

[0030] 8) Soak in varnish: Soak the product in the prepared varnish first;

[0031] 9) Testing, External Inspection, and Packaging: After soaking in varnish, the product is tested, inspected for appearance, and packaged. The pulse transformer product is 7.8mm long, 6.5mm wide, and 5.6mm high. The operating temperature range is -55°C to +85°C. Other performance parameters are as follows:

[0032] Table 1 Electrical performance parameters

[0033]

[0034] The above is only a specific implementation method of the present invention, but the scope of protection of the present invention is not limited to this. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A high-voltage pulse transformer, characterized in that: The invention comprises a skeleton (1), a manganese copper enameled wire (2) and a magnetic core (3), wherein two annular grooves (4) are provided on the skeleton (1), and a plurality of pins (5) are provided at the bottom of both ends. The skeleton (1) is provided with a through hole (8) located in the two annular grooves (4), and the manganese copper enameled wire (2) is wound around the two annular grooves (4) to form a primary winding and a secondary winding. The magnetic core (3) adopts two E-shaped magnetic cores, and a docking column (6) is provided in the middle. Two symmetrical receiving grooves (7) are provided on both sides of the docking column (6). The two docking columns (6) are inserted from both ends of the through hole (8) and then docked. The four receiving grooves (7) are inserted into the skeleton (1) and cover the primary winding and the secondary winding. After the two magnetic cores (3) are docked, they are wound and fixed with a high-temperature adhesive tape (9).

2. The high-voltage pulse transformer according to claim 1, characterized in that: The primary winding and the secondary winding are fixed with epoxy resin with an insulation strength of 15KV / mm. After the primary winding and the secondary winding are fixed with epoxy resin, a circle of epoxy resin layer is formed on the outside. The epoxy resin layer is lower than the height of the annular groove. After the primary winding and the secondary winding are fixed with epoxy resin, a high-temperature tape layer is wrapped around the outside.

3. The high-voltage pulse transformer according to claim 1, characterized in that: Two strip-shaped bosses (10) are downwardly arranged at the bottoms of both ends of the frame (1), and the two strip-shaped bosses (10) are provided with notches.

4. The high-voltage pulse transformer according to claim 1, characterized in that: The magnetic core (3) adopts a ferrite core, and the surface of the magnetic core (3) is coated with epoxy resin to form an epoxy resin layer, and the butt joint surfaces of the two magnetic cores (3) are not coated with the epoxy resin layer.

5. The high-voltage pulse transformer according to claim 1, characterized in that: It also includes a shell cover (11), which is clamped on the top of the frame (1).

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