High-frequency high-voltage transformer

Abstract

The high-frequency and high-voltage transformer comprises a U-shaped magnetic core and a primary winding wound on the periphery of the U-shaped magnetic core, the periphery of the U-shaped magnetic core is sequentially sleeved with an upper insulation sleeve shell part and a lower insulation sleeve shell part from top to bottom, and the primary winding is arranged in the upper insulation sleeve shell part and the lower insulation sleeve shell part. And a plurality of secondary winding mounting parts are arranged outside the upper insulating sleeve shell part and the lower insulating sleeve shell part in a sleeving and sliding manner. The invention relates to the technical field of high-frequency and high-voltage power supplies. According to the high-frequency and high-voltage transformer, the U-shaped magnetic core is adopted, the length of a magnetic circuit of the transformer is long, the leakage inductance of the transformer is reduced, high voltage is isolated through the upper insulation sleeve shell part, the lower insulation sleeve shell part and the secondary winding installation parts, the leakage inductance is further wound, and the whole device is more compact; and the distributed capacitance can be effectively reduced while the series combination of a plurality of secondary windings is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of high-frequency and high-voltage power supply, in particular to a high-frequency and high-voltage transformer. Background Art

[0002] Medical high-frequency X-ray generators and electrostatic dust removal equipment in the metallurgical field have high operating voltages, and the power supply required is a high-frequency and high-voltage power supply. The main functions of high-frequency and high-voltage transformers in power supplies are magnetic coupling to transfer energy, electrical isolation, voltage conversion, and impedance conversion. The insulation and isolation of the transformer affect the volume and weight of the entire power supply. The quality of its performance not only directly affects whether the output produces waveform distortion and the efficiency of energy transmission, but also may affect the safe operation of the power supply. Existing high-frequency and high-voltage transformers have the following defects: 1) In order to obtain the corresponding high voltage, the high-frequency high-voltage transformer has a very high transformation ratio. The leakage inductance of the transformer converted to the secondary inductance is very large, and the output power of the secondary will be greatly limited. At the same time, the leakage inductance will cause a surge voltage when the switch tube is turned off, which is easy to cause overvoltage damage to the switch tube; 2) The secondary winding of the transformer has many turns and layers, resulting in high distributed capacitance. Since the transformer operates at high frequency, the distributed capacitance will have a great impact on the working state of the transformer, causing waveform oscillation, transformer heating and deterioration of the EMC of the whole machine; 3) Transformer insulation includes the insulation of the secondary high voltage to the primary and the magnetic core, as well as the insulation inside the secondary high voltage winding. Due to the small size of the high-frequency high voltage transformer, the insulation distance is limited. Improving insulation strength and reducing leakage inductance are a contradiction. That is, improving insulation strength requires that the distance between the high voltage secondary and the primary and the magnetic core be as far as possible, while reducing leakage inductance requires that the distance between the secondary and the primary and the magnetic core be as close as possible.

[0003] Based on the retrieval of the above information, a high-frequency and high-voltage transformer is proposed to reduce the winding leakage inductance, reduce the distributed capacitance of the winding, and effectively solve the insulation problem. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-frequency and high-voltage transformer, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-frequency and high-voltage transformer, comprising a U-shaped magnetic core and a primary winding wound on the outer periphery of the U-shaped magnetic core, the outer periphery of the U-shaped magnetic core is sequentially sleeved with an upper insulating shell component and a lower insulating shell component from top to bottom, the primary winding is arranged inside the upper insulating shell component and the lower insulating shell component, the outer sides of the upper insulating shell component and the lower insulating shell component are jointly sleeved and slidably installed with a plurality of secondary winding mounting components, and a magnetic core fixing component is also arranged inside the upper insulating shell component.

[0006] The present invention is further configured as follows: the upper insulating casing member comprises an upper insulating shell, and the bottom of the upper insulating shell is connected to two male plugs; The two male plugs are both sleeved on the outer circumference of the primary winding.

[0007] The present invention is further configured as follows: the lower insulating casing comprises a lower insulating shell, and the top of the lower insulating shell is connected to two female plugs; The two female inserts are both sleeved on the outer periphery of the primary winding, and the bottom of the outer periphery of the bottom of the male insert is slidably matched with the top of the inner cavity of the female insert.

[0008] The present invention is further configured as follows: the secondary winding mounting parts are provided in an even number, the secondary winding mounting parts include an I-shaped cylinder, and the outer circumference of the I-shaped cylinder is sequentially sleeved and fixedly mounted with three sets of notch limiting rings from top to bottom; The I-shaped cylinder is sleeved and slidably installed on the outer circumference of the male plug-in cylinder and the female plug-in cylinder.

[0009] The present invention is further configured as follows: a partition is provided between two vertically adjacent I-shaped cylinders, and the partition is sleeved and slidably installed on the outer peripheries of the two male plug-in cylinders and the female plug-in cylinder.

[0010] The present invention is further configured as follows: stepped holes are provided on both sides of the bottom of the U-shaped magnetic core, and positioning screws are penetrated and slidably installed inside the two stepped holes.

[0011] The present invention is further configured as follows: the magnetic core fixing member includes a positioning plate, a threaded barrel is rotatably mounted on the top of the positioning plate through a support plate, screw rods are passed through and threadedly mounted on both ends of the threaded barrel, the threads opened on the surfaces of the two screw rods are arranged oppositely, and right-angled triangle plates are fixedly mounted on the opposite ends of the two screw rods; The two positioning screws both penetrate the positioning plate and extend to the top of the positioning plate. The outer periphery of the positioning screw is provided with a through groove used in conjunction with the right-angled triangular plate.

[0012] The present invention is further configured as follows: both sides of the positioning plate are configured as arc surfaces that slide with the arc sides of the inner cavity of the upper insulating shell; The horizontal portion of the U-shaped magnetic core is arranged inside the lower insulating shell, and a buffer positioning pad is arranged between the horizontal portion of the U-shaped magnetic core and the top of the inner cavity of the lower insulating shell.

[0013] The present invention provides a high-frequency and high-voltage transformer. It has the following beneficial effects: (1) The present invention adopts a U-shaped magnetic core, and the magnetic path length of the transformer is long, which is beneficial to reducing the leakage inductance of the transformer. The upper insulating shell member, the lower insulating shell member and the secondary winding mounting member are used to isolate the high voltage and further reduce the winding leakage inductance. The overall device is more compact, and through the arrangement of a plurality of secondary winding mounting members, it is convenient to connect multiple secondary windings in series, and the distributed capacitance can be effectively reduced.

[0014] (2) The present invention cooperates with the core fixing part and the positioning screw. By rotating the threaded barrel, the two positioning screws can be synchronously positioned to achieve stable positioning of the U-shaped core. With the cooperation of the buffer positioning pad, the stability and accuracy of the installation of the U-shaped core are further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the external structure of the present invention from a bottom-up perspective; Figure 2 It is a schematic diagram of the external structure of the present invention from a top view; Figure 3 It is a schematic structural diagram of the upper insulating casing member and the lower insulating casing member of the present invention; Figure 4 It is a schematic diagram of the structure of the U-shaped magnetic core, stepped hole, positioning screw, through slot and buffer positioning pad of the present invention; Figure 5 It is a structural schematic diagram of the secondary winding mounting member of the present invention; Figure 6 It is a connection schematic diagram of the U-shaped magnetic core, the positioning screw and the magnetic core fixing structure of the present invention.

[0016] In the figure: 1. U-shaped magnetic core; 101. stepped hole; 102. positioning screw; 103. through slot; 2. Primary winding; 3. Upper insulating casing; 301. Upper insulating casing; 302. Male plug; 4. Lower insulating casing; 401. Lower insulating casing; 402. Female plug; 5. Secondary winding mounting parts; 501. I-type cylinder; 502. Notch limiting ring; 6. Magnetic core fixing part; 601. Positioning plate; 602. Threaded tube; 603. Screw rod; 604. Right angle triangle plate; 605. Buffer positioning pad; 7. Partition. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] See also Figure 1-6The embodiment of the present invention provides the following technical solution: a high-frequency high-voltage transformer, comprising a U-shaped magnetic core 1, an upper insulating casing 3, a lower insulating casing 4, a plurality of secondary winding mounting members 5 and a magnetic core fixing member 6, wherein the U-shaped magnetic core 1 is a UY20 magnetic core, and the cross-sectional area of ​​the U-shaped magnetic core 1 is 2.9 cm 2 The U-shaped magnetic core 1 has a longer magnetic path length, which is beneficial to enhancing the coupling coefficient between the primary and secondary and reducing the leakage inductance of the transformer. Two groups of primary windings 2 are wound around the outer periphery of the U-shaped magnetic core 1, and the two groups of primary windings 2 are both arranged inside the upper insulating shell component 3 and the lower insulating shell component 4.

[0019] As a preferred solution, in order to achieve effective isolation of the primary winding 2 and the secondary winding, the upper insulating shell component 3 includes an upper insulating shell 301, the bottom of the upper insulating shell 301 is connected to two male plug-ins 302, and the two male plug-ins 302 are both sleeved on the outer periphery of the primary winding 2. The lower insulating shell component 4 includes a lower insulating shell 401, the top of the lower insulating shell 401 is connected to two female plug-ins 402, and the two female plug-ins 402 are both sleeved on the outer periphery of the primary winding 2, and the bottom of the outer periphery of the bottom of the male plug-in 302 slides with the top of the inner cavity of the female plug-in 402.

[0020] As a preferred solution, in order to further reduce the high distributed capacitance problem caused by the secondary winding and isolate the high voltage, the secondary winding mounting parts 5 are provided in an even number, and the secondary winding mounting parts 5 include an I-shaped cylinder 501, which is sleeved and slidably installed on the outer periphery of the male plug-in cylinder 302 and the female plug-in cylinder 402. The outer periphery of the I-shaped cylinder 501 is sleeved and fixedly installed with three groups of notched limiting rings 502 in sequence from top to bottom. Furthermore, a partition 7 is provided between two vertically adjacent I-shaped cylinders 501, and the partition 7 is sleeved and slidably installed on the outer periphery of the two male plug-in cylinders 302 and the female plug-in cylinder 402. Figure 1 , Figure 2 and Figure 5 As shown, six secondary winding mounting parts 5 are provided, and the secondary winding is wound in a cavity environment formed by the outer periphery of the I-shaped cylinder 501 and the notch limiting ring 502, and the coil is continuously wound through the notch of the notch limiting ring 502. It should be noted that the secondary windings wound on the six secondary winding mounting parts 5 are connected in series to output 15kV high voltage.

[0021] As a preferred solution, in order to achieve accurate positioning and stable assembly of the U-shaped magnetic core 1, stepped holes 101 are provided on both sides of the bottom of the U-shaped magnetic core 1, and positioning screws 102 are penetrated and slidably installed inside the two stepped holes 101. The heads of the positioning screws 102 are arranged with flat grooves to facilitate the rotation of the positioning screws 102. The magnetic core fixing part 6 includes a positioning plate 601, and both sides of the positioning plate 601 are arranged as arc surfaces that slide with the arc sides of the inner cavity of the upper insulating shell 301 to achieve precise fitting of the positioning plate 601 with the upper insulating shell 301, avoid horizontal movement of the positioning plate 601, and provide accurate positioning for the two positioning screws 102. The top of the positioning plate 601 is supported by a support plate A threaded barrel 602 is rotatably installed, and screw rods 603 are penetrated and threadedly installed at both ends of the threaded barrel 602. The threads opened on the surfaces of the two screw rods 603 are arranged oppositely, and the opposite ends of the two screw rods 603 are fixedly installed with right-angled triangular plates 604. The two positioning screws 102 penetrate the positioning plate 601 and extend to the top of the positioning plate 601. The outer periphery of the positioning screws 102 is provided with a through groove 103 used in conjunction with the right-angled triangular plates 604. In order to ensure the stability of the U-shaped magnetic core 1, the horizontal part of the U-shaped magnetic core 1 is arranged inside the lower insulating shell 401, and a buffer positioning pad 605 is arranged between the horizontal part of the U-shaped magnetic core 1 and the top of the inner cavity of the lower insulating shell 401.

[0022] As an optional solution, after the positioning plate 601 is put on the two positioning screws 102, the nuts are directly put on to position the two positioning screws 102. The disadvantage of this method is that it cannot easily ensure the consistency of the pre-tightening force of the two nuts.

[0023] When in use, the secondary winding is wound on the secondary winding mounting member 5. After the winding and assembly of the six secondary winding mounting members 5 is completed, the six secondary winding mounting members 5 are sleeved on the male plug-in tube 302 and the female plug-in tube 402. When two vertically adjacent secondary winding mounting members 5 are assembled, a partition plate 7 is used as a spacer, and then the two male plug-in tubes 302 are respectively inserted into the two female plug-in tubes 402. The buffer positioning pad 605 is placed on the top of the horizontal part of the U-shaped magnetic core 1. At this time, the buffer positioning pad 605 is stuck between the two vertical parts of the U-shaped magnetic core 1. After the primary winding 2 is wound on the two vertical parts of the U-shaped magnetic core 1, the two vertical parts of the U-shaped magnetic core 1 are passed through the lower insulating shell 401, the female plug-in cylinder 402 and the male plug-in cylinder 302 in sequence, and then the positioning screw 102 is inserted into the stepped hole 101. After the positioning screw 102 enters the interior of the upper insulating shell 301, the positioning plate 601 is sleeved in the two positioning screws 102, and the threaded cylinder 602 is rotated. The threaded cylinder 602 drives the two screws 603 to move synchronously in the opposite direction. The screw 603 pushes the right-angled triangle plate 604 to insert into the through groove 103. After the inclined surface of the right-angled triangle plate 604 is in close contact with one side of the top of the inner cavity of the through groove 103, the positioning of the U-shaped magnetic core 1 is completed.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High frequency and high voltage transformer, characterized in that: The invention comprises a U-shaped magnetic core (1) and a primary winding (2) wound around the outer periphery of the U-shaped magnetic core (1); the outer periphery of the U-shaped magnetic core (1) is sequentially sleeved with an upper insulating casing member (3) and a lower insulating casing member (4) from top to bottom; the primary winding (2) is arranged inside the upper insulating casing member (3) and the lower insulating casing member (4); a plurality of secondary winding mounting members (5) are sleeved and slidably mounted on the outer portions of the upper insulating casing member (3) and the lower insulating casing member (4); and a magnetic core fixing member (6) is also arranged inside the upper insulating casing member (3).

2. The high-frequency high-voltage transformer according to claim 1, characterized in that: The upper insulating casing (3) comprises an upper insulating shell (301), and the bottom of the upper insulating shell (301) is connected to two male plugs (302); The two male plug-in sleeves (302) are both sleeved on the outer circumference of the primary winding (2).

3. The high-frequency high-voltage transformer according to claim 2, characterized in that: The lower insulating casing (4) comprises a lower insulating shell (401), and the top of the lower insulating shell (401) is connected to two female plugs (402); The two female plug-ins (402) are both sleeved on the outer circumference of the primary winding (2), and the bottom of the outer circumference of the bottom of the male plug-in (302) is slidably matched with the top of the inner cavity of the female plug-in (402).

4. The high-frequency high-voltage transformer according to claim 3, characterized in that: The secondary winding mounting parts (5) are provided in an even number, and the secondary winding mounting parts (5) comprise an I-shaped cylinder (501), and three groups of notched limiting rings (502) are sequentially sleeved and fixedly mounted on the outer circumference of the I-shaped cylinder (501) from top to bottom; The I-shaped cylinder (501) is sleeved and slidably mounted on the outer circumference of the male plug cylinder (302) and the female plug cylinder (402).

5. The high frequency and high voltage transformer according to claim 4, characterized in that: A partition plate (7) is provided between two vertically adjacent I-shaped cylinders (501), and the partition plate (7) is sleeved and slidably mounted on the outer circumference of the two male plug cylinders (302) and the female plug cylinder (402).

6. The high frequency and high voltage transformer according to claim 3, characterized in that: Stepped holes (101) are provided on both sides of the bottom of the U-shaped magnetic core (1), and positioning screws (102) are penetrated and slidably installed inside the two stepped holes (101).

7. The high frequency and high voltage transformer according to claim 6, characterized in that: The magnetic core fixing member (6) comprises a positioning plate (601), a threaded cylinder (602) being rotatably mounted on the top of the positioning plate (601) via a support plate, screw rods (603) being passed through and threadedly mounted on both ends of the threaded cylinder (602), the threads on the surfaces of the two screw rods (603) being arranged opposite to each other, and right-angled triangle plates (604) being fixedly mounted on the opposite ends of the two screw rods (603); The two positioning screws (102) both penetrate the positioning plate (601) and extend to the top of the positioning plate (601). The outer periphery of the positioning screws (102) is provided with a through slot (103) for use with the right-angled triangle plate (604).

8. The high frequency and high voltage transformer according to claim 7, characterized in that: Both sides of the positioning plate (601) are arranged as arc surfaces that are slidably matched with the arc sides of the inner cavity of the upper insulating shell (301); The horizontal portion of the U-shaped magnetic core (1) is arranged inside the lower insulating shell (401), and a buffer positioning pad (605) is arranged between the horizontal portion of the U-shaped magnetic core (1) and the top of the inner cavity of the lower insulating shell (401).

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