High frequency high voltage transformer for electron curtain accelerator

Abstract

This application relates to the field of accelerator technology; it provides a high-frequency high-voltage transformer for an electron curtain accelerator. The high-frequency high-voltage transformer includes a magnetic core, an isolation sleeve, a primary winding assembly, and a secondary winding assembly. The primary winding assembly includes a main transformer primary winding and a filament primary winding that are separated and arranged separately. The secondary winding assembly includes a main transformer secondary winding and a filament secondary winding that are separated and arranged separately. The isolation sleeve covers the outer periphery of the magnetic core, the primary winding assembly is located inside the isolation sleeve and disposed on the magnetic core, and the secondary winding assembly is disposed on the outer peripheral wall of the isolation sleeve. The high-frequency high-voltage transformer provided in this application can reduce the installation space of the electron curtain accelerator.

Description

Technical Field

[0001] This application relates to the field of accelerator technology, and more particularly to a high-frequency high-voltage transformer for an electron curtain accelerator. Background Technology

[0002] Electron curtain accelerators are widely used in printing and packaging, material curing lamps, and industrial irradiation. Their core component, the transformer, needs to meet stringent requirements such as high frequency and high voltage, filament isolation power supply, and long-term operation.

[0003] In related technologies, high-frequency high-voltage transformers often adopt a separate design from filament isolation transformers, which has the disadvantage of large size and cannot be used in scenarios with compact installation space. Summary of the Invention

[0004] This application provides a high-frequency high-voltage transformer for an electronic curtain accelerator, which can reduce the installation space of the electronic curtain accelerator.

[0005] The technical solution of this application embodiment is implemented as follows: This application provides a high-frequency high-voltage transformer for an electron curtain accelerator. The high-frequency high-voltage transformer includes a magnetic core, an isolation sleeve, a primary winding assembly, and a secondary winding assembly. The primary winding assembly includes a main transformer primary winding and a filament primary winding that are separated from each other. The secondary winding assembly includes a main transformer secondary winding and a filament secondary winding that are separated from each other. The isolation sleeve covers the outer periphery of the magnetic core. The primary winding assembly is located inside the isolation sleeve and disposed on the magnetic core. The secondary winding assembly is disposed on the outer peripheral wall of the isolation sleeve.

[0006] In one embodiment, the outer peripheral wall of the magnetic core is formed with a first winding region and a second winding region arranged axially separated along the isolation sleeve; the primary winding of the filament is wound in the first winding region, and the primary winding of the main transformer is wound in the second winding region; and / or, The outer peripheral wall of the isolation sleeve has a third winding area and a fourth winding area arranged separately along its axial direction. The secondary winding of the filament is wound in the third winding area, and the secondary winding of the main transformer is wound in the fourth winding area.

[0007] In one embodiment, an insulating layer and / or a shielding layer are provided between the magnetic core and the primary winding assembly; and / or, an insulating layer and / or a shielding layer are provided between the primary winding assembly and the isolation sleeve.

[0008] In one embodiment, the magnetic core is made of microcrystalline iron core; and / or, The coil of the primary winding of the main transformer is Litz wire.

[0009] In one embodiment, the magnetic core includes two connecting portions and two winding portions. The two winding portions are spaced apart along a first direction. The two connecting portions are respectively connected to the ends of the two winding portions along the axial direction of the isolation sleeve. An isolation sleeve is fitted around the outer periphery of each winding portion. The winding portion is provided with the primary winding assembly. The primary windings of the main transformer of the two winding portions are connected in parallel for input. The primary filament windings of the two winding portions are connected in parallel for input. The secondary filament windings of the two isolation sleeves are connected in parallel for output. The secondary windings of the main transformer of the two isolation sleeves are connected in series for output. The first direction is perpendicular to the axial direction of the isolation sleeve.

[0010] In one embodiment, each of the isolation sleeves has multiple primary transformer secondary windings, and the multiple primary transformer secondary windings are spaced apart along the axial direction of the isolation sleeve.

[0011] In one embodiment, on each of the isolation sleeves, the number of turns of at least one of the primary transformer secondary windings is different from the number of turns of the other primary transformer secondary windings.

[0012] In one embodiment, the high-frequency high-voltage transformer includes multiple voltage multiplier rectifier units, and each lead of the secondary winding of the main transformer is connected to a voltage multiplier rectifier unit.

[0013] In one embodiment, an insulation structure is provided between two adjacent secondary windings of the main transformer on each of the isolation sleeves.

[0014] In one embodiment, the high-frequency high-voltage transformer includes a voltage divider sampling unit, which is used to measure the output voltage of the secondary winding of the main transformer; and / or, The high-frequency high-voltage transformer is vacuum-encapsulated with epoxy resin.

[0015] This application provides a high-frequency high-voltage transformer. By placing an isolation sleeve on the outer periphery of the magnetic core, and then placing the primary winding assembly on the outer peripheral wall of the magnetic core and the secondary winding assembly on the outer peripheral wall of the isolation sleeve, the filament power supply circuit and the main transformer power supply circuit can share a single magnetic core. This eliminates the need for a filament transformer, reducing the size of the electron curtain accelerator and simplifying wiring to some extent, allowing the accelerator to be installed in confined spaces. Since the primary winding of the main transformer and the primary winding of the filament are separated in the primary winding assembly, and the secondary winding of the main transformer and the secondary winding of the filament are also separated in the secondary winding assembly, the filament winding can be isolated from the main transformer winding. This reduces high-voltage feedback interference and crosstalk, ensuring stable cathode filament temperature, uniform electron emission, and stable beam current in the electron curtain accelerator, thereby improving irradiation quality. Attached Figure Description

[0016] Figure 1A schematic diagram of the structure of a high-frequency high-voltage transformer for an electron curtain accelerator provided in this application embodiment; Figure 2 A circuit design diagram of the high-frequency high-voltage transformer of an electron curtain accelerator provided in another embodiment of this application.

[0017] Explanation of reference numerals in the attached figures 100. High-frequency high-voltage transformer; 1. Magnetic core; 11. Connecting part; 12. Winding part; 2. Isolation sleeve; 2a. Third winding area; 2b. Fourth winding area; 3. Primary winding assembly; 31. Main transformer primary winding; 32. Filament primary winding; 4. Secondary winding assembly; 41. Main transformer secondary winding; 42. Filament secondary winding; 5. Voltage multiplier rectifier unit; 51. Capacitor; 52. Diode; 53. Voltage equalizing resistor; 6. Voltage divider sampling unit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "primary," "secondary," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly including at least one feature.

[0022] This application provides a high-frequency high-voltage transformer 100 for an electron curtain accelerator. Please refer to [link to relevant documentation]. Figure 1 and Figure 2The high-frequency high-voltage transformer 100 includes a magnetic core 1, an isolation sleeve 2, a primary winding assembly 3, and a secondary winding assembly 4. The primary winding assembly 3 includes a primary transformer winding 31 and a filament primary winding 32 that are separated from each other. The secondary winding assembly 4 includes a secondary transformer winding 41 and a filament secondary winding 42 that are separated from each other. The isolation sleeve 2 covers the outer periphery of the magnetic core 1. The primary winding assembly 3 is located inside the isolation sleeve 2 and is disposed on the magnetic core 1. The secondary winding assembly 4 is disposed on the outer periphery wall of the isolation sleeve 2.

[0023] The isolation sleeve 2 refers to the insulation structure used to isolate the primary winding assembly 3 from the secondary winding assembly 4.

[0024] For example, the shape of the isolation sleeve 2 is not limited; for instance, it can be a hollow, barrel-shaped structure with both ends through it.

[0025] The primary winding assembly 3 includes the main transformer primary winding 31 and the filament primary winding 32, which are separated. This means that the main transformer primary winding 31 and the filament primary winding 32 are separated, that is, they have a certain distance in space to reduce high voltage feedback interference and crosstalk.

[0026] For example, by inputting an AC power of 220V, 50Hz to the primary winding 32 of the filament, and then outputting the target voltage of the filament, such as 20V, 50A, through the secondary winding 42 of the filament, it is possible to power the filament of the electron curtain accelerator, so that the cathode is heated and emits electrons.

[0027] By inputting voltage to the primary winding 31 of the main transformer and then outputting the target voltage of the main transformer through the secondary winding 41 of the main transformer, the target voltage of the main transformer can be applied to the two stages of the electronic curtain heater, so that electrons can move from the cathode to the anode and strike the target material, thereby generating rays.

[0028] The high-frequency high-voltage transformer 100 of the electron curtain accelerator provided in this application, by covering the outer periphery of the magnetic core 1 with an isolation sleeve 2, and by placing the primary winding assembly 3 on the outer peripheral wall of the magnetic core 1 and the secondary winding assembly 4 on the outer peripheral wall of the isolation sleeve 2, allows the filament power supply circuit and the main transformer power supply circuit to share a single magnetic core 1. This eliminates the need for a filament transformer, reducing the size of the electron curtain accelerator and simplifying wiring to some extent, making it suitable for installations in confined spaces. Since the main transformer primary winding 31 and the filament primary winding 32 of the primary winding assembly 3 are separated, and the main transformer secondary winding 41 and the filament secondary winding 42 of the secondary winding assembly 4 are also separated, the filament windings can be isolated from the main transformer windings. This reduces high-voltage feedback interference and crosstalk, ensuring stable cathode filament temperature, uniform electron emission, and stable beam current, thereby improving irradiation quality.

[0029] In one embodiment, the outer peripheral wall of the magnetic core 1 is formed with a first winding area and a second winding area arranged axially along the isolation sleeve 2. The primary winding 32 of the filament is wound in the first winding area, and the primary winding 31 of the main transformer is wound in the second winding area.

[0030] In other words, the filament primary winding 32 and the main transformer primary winding 31 are arranged at intervals along the axial direction of the isolation sleeve 2 on the outer peripheral wall of the magnetic core 1.

[0031] The arrangement of the filament secondary winding 42 and the main transformer secondary winding 41 can be nested, that is, the main transformer secondary winding 41 can be wound at intervals around the outer periphery of the filament secondary winding 42.

[0032] In this way, by separating the filament primary winding 32 and the main transformer primary winding 31 along the axial direction of the isolation sleeve 2, not only can the interference between the two be reduced, but the spatial layout can also be optimized to a certain extent.

[0033] In one embodiment, please refer to Figure 1 The outer peripheral wall of the isolation sleeve 2 is divided into a third winding area 2a and a fourth winding area 2b along its axial direction. The filament secondary winding 42 is wound in the third winding area 2a, and the main transformer secondary winding 41 is wound in the fourth winding area 2b.

[0034] In other words, the filament secondary winding 42 and the main transformer secondary winding 41 are arranged at intervals along the axial direction of the isolation sleeve 2 on the outer peripheral wall of the isolation sleeve 2.

[0035] The primary winding 32 of the filament and the primary winding 31 of the main transformer can be arranged in a nested manner, that is, the primary winding 31 of the main transformer can be wound at intervals around the outer periphery of the primary winding 32 of the filament.

[0036] In this way, by separating the filament secondary winding 42 and the main transformer secondary winding 41 along the axial direction of the isolation sleeve 2, the interference between the two can be reduced and the spatial layout can be optimized.

[0037] In one embodiment, the outer peripheral wall of the magnetic core 1 has a first winding region and a second winding region arranged axially separated along the isolation sleeve 2. The primary winding 32 of the filament is wound in the first winding region, and the primary winding 31 of the main transformer is wound in the second winding region. The outer peripheral wall of the isolation sleeve 2 has a third winding region 2a and a fourth winding region 2b arranged axially separated therefrom. The secondary winding 42 of the filament is wound in the third winding region 2a, and the secondary winding 41 of the main transformer is wound in the fourth winding region 2b.

[0038] It should be noted that the third winding area 2a can be located on the outer periphery of the first winding area, and the fourth winding area 2b can be located on the outer periphery of the second winding area, so that the filament secondary winding 42 can be located on the outer periphery of the filament primary winding 32, and the main transformer secondary winding 41 can be located on the outer periphery of the main transformer secondary winding 41.

[0039] This reduces interference, improves beam stability, and consequently enhances irradiation quality.

[0040] In one embodiment, an insulating layer and / or a shielding layer are provided between the magnetic core 1 and the primary winding assembly 3.

[0041] In other words, an insulating layer is provided between the outer peripheral wall of the magnetic core 1 and the primary winding 32 of the filament and the primary winding 31 of the main transformer, or an insulating layer is provided between the outer peripheral wall of the magnetic core 1 and the primary winding 32 of the filament and the primary winding 31 of the main transformer, or an insulating layer and a shielding layer are provided between the outer peripheral wall of the magnetic core 1 and the primary winding 32 of the filament and the primary winding 31 of the main transformer.

[0042] For example, the insulating layer can be a composite film of polyimide film and DM-F (F-grade DM composite insulating film, where DM refers to polyester film and polyester nonwoven fabric).

[0043] A suspended shielding layer can be made of copper strips.

[0044] This isolates the magnetic core 1 from the primary winding assembly 3, reducing interference between them.

[0045] In one embodiment, an insulating layer and / or a shielding layer are provided between the primary winding assembly 3 and the isolation sleeve 2.

[0046] In other words, an insulating layer is provided between the primary winding 32 of the filament and the primary winding 31 of the main transformer and the inner peripheral wall of the isolation sleeve 2, or an insulating layer is provided between the primary winding 32 of the filament and the primary winding 31 of the main transformer and the inner peripheral wall of the isolation sleeve 2, or an insulating layer and a shielding layer are provided between the primary winding 32 of the filament and the primary winding 31 of the main transformer and the inner peripheral wall of the isolation sleeve 2.

[0047] This isolates the primary winding assembly 3 from the secondary winding assembly 4, reducing interference between them.

[0048] In some embodiments, an insulating layer and a shielding layer are provided between the magnetic core 1 and the primary winding assembly 3, and an insulating layer and a shielding layer are provided between the primary winding assembly 3 and the isolation sleeve 2.

[0049] In this way, the input of the primary winding 32 of the filament, the filament and the high voltage can be isolated.

[0050] In some embodiments, alkali-free glass cloth tape can be wrapped around the outside of the shielding layer. The number of wrapping layers is not limited, for example, it can be three layers. When wrapping, the upper layer can overlap half of the area of ​​the lower layer to achieve mechanical reinforcement and insulation protection.

[0051] In one embodiment, the magnetic core 1 is made of microcrystalline iron core.

[0052] Here, using a microcrystalline iron core as the material of magnetic core 1 can take advantage of the high permeability and low magnetic loss characteristics of the microcrystalline iron core under high frequency operating conditions to reduce magnetic attraction and winding eddy current losses, improve energy conversion efficiency and reduce operating temperature rise.

[0053] In one embodiment, the coil of the primary winding 31 of the main transformer is Litz wire.

[0054] For example, the primary winding 31 of the main transformer can be wound with seven turns of Litz wire and wound in a single layer.

[0055] Here, using Litz wire makes the primary winding 31 of the main transformer suitable for high-frequency operating conditions.

[0056] In one embodiment, the magnetic core 1 is made of microcrystalline iron core, and the primary winding 31 of the main transformer is made of Litz wire.

[0057] Here, the use of microcrystalline magnetic core 1 in combination with Litz wire can not only reduce eddy current loss, but also improve energy conversion efficiency, supporting the continuous operation of the electron curtain accelerator 24 / 7.

[0058] In one embodiment, please refer to Figure 1 The magnetic core 1 includes two connecting parts 11 and two winding parts 12. The two winding parts 12 are spaced apart along a first direction. The two connecting parts 11 are respectively connected to the ends of the two winding parts 12 along the axial direction of the isolation sleeve 2. An isolation sleeve 2 is fitted on the outer periphery of each winding part 12. The winding part 12 is provided with a primary winding assembly 3. The primary windings 31 of the main transformer of the two winding parts 12 are input in parallel. The primary windings 32 of the filaments of the two winding parts 12 are input in parallel. The secondary windings 42 of the filaments of the two isolation sleeves 2 are output in parallel. The secondary windings 41 of the main transformer of the two isolation sleeves 2 are output in series. The first direction is perpendicular to the axial direction of the isolation sleeve 2.

[0059] Two winding sections 12 are spaced apart along the first direction, and two connecting sections 11 are respectively connected to the ends of the two winding sections 12 along the circumference of the isolation sleeve 2, so that the entire magnetic core 1 is generally in a ring shape.

[0060] For example, the winding section 12 may have a first winding area and a second winding area.

[0061] The primary windings 31 of the two winding sections 12 are connected in parallel and can be connected to a high-frequency power supply of 800V / 40kHz. The secondary windings 41 of the two isolation sleeves 2 are connected in series and can output 150kV.

[0062] The primary filament windings 32 of the two winding sections 12 are connected in parallel and can be connected to 220V, 50Hz, so that the secondary filament windings 42 of the two isolation sleeves 2 can be connected in parallel and output 20V, 50A isolated power supply.

[0063] Here, the primary windings 31 of the main transformer on the two winding sections 12 can be connected in parallel to serve as the input terminal of the main transformer circuit. Then, by connecting the secondary windings 41 of the main transformer on the two isolation sleeves 2 in series, the output voltages of the secondary windings 41 of the main transformer can be superimposed to achieve the target voltage of the main transformer. The primary windings 32 of the filament on the two winding sections 12 can be connected in parallel to serve as the input terminal of the filament circuit. Finally, by connecting the secondary windings 42 of the filament on the two isolation sleeves 2 in parallel to serve as the output terminal of the filament circuit, the target voltage and current of the filament can be output.

[0064] For example, Figure 1 R1 can be the axial direction of the isolation sleeve 2, and R2 can be the first direction.

[0065] In one embodiment, please refer to Figure 1 and Figure 2 Each isolation sleeve 2 has multiple main transformer secondary windings 41, and these multiple main transformer secondary windings 41 are spaced apart along the axial direction of the isolation sleeve 2.

[0066] In other words, the fourth winding zone 2b has multiple sections.

[0067] For example, the number of primary transformer secondary windings 41 on both isolation sleeves 2 can be six. The six primary transformer secondary windings 41 are spaced apart along the axial direction of the isolation sleeve 2, that is, the total number of primary transformer secondary windings 41 can be twelve. The primary transformer secondary windings 41 on the two isolation sleeves 2 are symmetrically arranged and the winding direction is the same.

[0068] Here, by setting multiple secondary windings 41 of the main transformer, the output voltages after being connected in series are superimposed to the target voltage of the main transformer, such as 150kV.

[0069] In one embodiment, on each isolation sleeve 2, the number of turns of at least one primary transformer secondary winding 41 is different from the number of turns of the other primary transformer secondary windings 41.

[0070] For example, the two isolation sleeves 2 can be the first isolation sleeve 2 and the second isolation sleeve 2, and the number of the main transformer secondary windings 41 of the first isolation sleeve 2 and the second isolation sleeve 2 can both be six.

[0071] The coils of all the main transformer secondary windings 41 on the first isolation sleeve 2 can be wound with triple-insulated wire with a diameter of 0.4mm. The number of turns of the six main transformer secondary windings 41 is configured as follows: the first five main transformer secondary windings 41 along the axial direction of the isolation sleeve 2 each have 180 turns, each main transformer secondary winding 41 is wound in ten layers with 18 turns per layer, and the last main transformer secondary winding 41 is wound in two layers with 18 turns per layer. The coils of all the main transformer secondary windings 41 on the second isolation sleeve 2 can be wound with triple-insulated wire with a diameter of 0.4mm. The number of turns of the six main transformer secondary windings 41 is configured as follows: the first four main transformer secondary windings 41 along the axial direction of the isolation sleeve 2 each have 180 turns, each main transformer secondary winding 41 is wound in ten layers with 18 turns per layer, the fifth main transformer secondary winding 41 is wound in four layers with 70 turns per layer, and the last main transformer secondary winding 41 is wound in a single layer with 12 turns per layer. This allows for tap changer designs at -140kV, -146kV, 149kV, and -150kV to meet different requirements.

[0072] In this way, by setting different numbers of turns, different secondary windings 41 of the main transformer can be selected to be connected according to different target voltage requirements of the main transformer, so as to adapt to different needs and have good adaptability.

[0073] In one embodiment, please refer to Figure 2 The high-frequency high-voltage transformer 100 includes multiple voltage multiplier rectifier units 5, and each lead of the secondary winding 41 of the main transformer is connected to a voltage multiplier rectifier unit 5.

[0074] For example, the number of voltage multiplier rectifier units 5 can be twelve, with one voltage multiplier rectifier unit 5 connected to the lead of each main transformer secondary winding 41. See also... Figure 2 The twelve voltage multiplier rectifier units 5 can output DC1kV, DC3kV, DC6kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, DC15.56kV, and DC15.56kV respectively from top to bottom, and can finally be superimposed to output a -150kV DC high voltage.

[0075] For example, the lead wires of the secondary winding 41 of the main transformer can be high-voltage silicone rubber wires with an accuracy class of 0.2 and a DC 30kV rating.

[0076] In this way, by setting up the voltage multiplier rectifier unit 5, the AC high voltage output from the secondary winding 41 of the main transformer can be rectified into DC high voltage to reduce beam current fluctuations.

[0077] In some embodiments, each voltage doubler rectifier unit 5 includes a cascaded structure of capacitor 51 and diode 52. (See also...) Figure 2The capacitors 51 of the twelve voltage doubler rectifier units 5 are arranged from top to bottom as follows: 4kV / 1.5μF×2, 5kV / 0.5μF×2, 10kV / 0.33μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, 20kV / 0.1μF×2, and 20kV / 0.1μF×2.

[0078] In some embodiments, please refer to Figure 2 Each voltage doubler rectifier branch is equipped with a 10MΩ equalizing resistor 53 connected in parallel. On the one hand, it is used to equalize the voltage, so that the voltage distribution of each capacitor 51 is balanced and the local voltage over-excess breakdown is reduced. On the other hand, it can automatically discharge the residual charge of the capacitor 51 after power failure, quickly release the residual high voltage, improve the service-level maintenance safety performance of the electron curtain accelerator, and reduce the impact damage of residual high voltage to the device.

[0079] In one embodiment, an insulation structure is provided between two adjacent main transformer secondary windings 41 on each isolation sleeve 2.

[0080] For example, the bonding structure can be a three-layer stack, with the bottom layer being a polyimide film, the middle layer being a polyimide film and a DM-F composite film, and the top layer being a polyimide film.

[0081] In this way, by setting an insulation structure between two adjacent secondary windings 41 of the main transformer, the concentration of high voltage electric field, partial discharge and corona phenomenon can be effectively suppressed, thereby reducing the risk of arcing and breakdown and adapting to the complex environment of industrial sites.

[0082] In one embodiment, please refer to Figure 2 The high-frequency high-voltage transformer 100 includes a voltage divider sampling unit 6, which is used to measure the output voltage of the secondary winding 41 of the main transformer.

[0083] For example, a 300MΩ resistor can be connected in parallel on the measurement branch of the voltage divider sampling unit 6, and then a voltage divider ratio of 30000:1 is used, with the ground terminal as the reference point.

[0084] This enables precise high-voltage sampling and closed-loop control, providing sampling signals for closed-loop voltage regulation and fault protection of high-frequency high-voltage transformers.

[0085] In one embodiment, the high-frequency high-voltage transformer 100 is vacuum-encapsulated with epoxy resin.

[0086] In other words, the magnetic core 1, primary winding assembly 3, secondary winding assembly 4, shielding layer, voltage multiplier rectifier unit 5, and voltage equalizing resistor 53 are all vacuum-encapsulated with epoxy resin, forming an integrated insulating package after curing. This improves the overall insulation strength, mechanical structure strength, moisture and dust resistance, and corona suppression capabilities, meeting the requirements for long-term continuous and reliable operation under high voltage conditions such as 150kV.

[0087] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A high-frequency high-voltage transformer for an electron curtain accelerator, characterized in that, The high-frequency high-voltage transformer includes a magnetic core, an isolation sleeve, a primary winding assembly, and a secondary winding assembly. The primary winding assembly includes a primary transformer winding and a filament primary winding that are separated from each other. The secondary winding assembly includes a secondary transformer winding and a filament secondary winding that are separated from each other. The isolation sleeve covers the outer periphery of the magnetic core. The primary winding assembly is located inside the isolation sleeve and disposed on the magnetic core. The secondary winding assembly is disposed on the outer peripheral wall of the isolation sleeve.

2. The high-frequency high-voltage transformer according to claim 1, characterized in that, The outer peripheral wall of the magnetic core has a first winding region and a second winding region arranged axially separated along the isolation sleeve. The primary winding of the filament is wound in the first winding region, and the primary winding of the main transformer is wound in the second winding region; and / or, The outer peripheral wall of the isolation sleeve has a third winding area and a fourth winding area arranged separately along its axial direction. The secondary winding of the filament is wound in the third winding area, and the secondary winding of the main transformer is wound in the fourth winding area.

3. The high-frequency high-voltage transformer according to claim 1, characterized in that, An insulating layer and / or a shielding layer are provided between the magnetic core and the primary winding assembly; and / or, an insulating layer and / or a shielding layer are provided between the primary winding assembly and the isolation sleeve.

4. The high-frequency high-voltage transformer according to claim 1, characterized in that, The magnetic core is made of microcrystalline iron; and / or, The coil of the primary winding of the main transformer is Litz wire.

5. The high-frequency high-voltage transformer according to claim 2, characterized in that, The magnetic core includes two connecting parts and two winding parts. The two winding parts are spaced apart along a first direction. The two connecting parts are respectively connected to the ends of the two winding parts along the axial direction of the isolation sleeve. An isolation sleeve is fitted around the outer periphery of each winding part. The winding part is provided with the primary winding assembly. The primary windings of the main transformer of the two winding parts are connected in parallel for input. The primary windings of the filaments of the two winding parts are connected in parallel for input. The secondary windings of the filaments of the two isolation sleeves are connected in parallel for output. The secondary windings of the main transformer of the two isolation sleeves are connected in series for output. The first direction is perpendicular to the axial direction of the isolation sleeve.

6. The high-frequency high-voltage transformer according to claim 5, characterized in that, Each isolation sleeve has multiple primary transformer secondary windings, and these multiple primary transformer secondary windings are spaced apart along the axial direction of the isolation sleeve.

7. The high-frequency high-voltage transformer according to claim 6, characterized in that, On each of the isolation sleeves, the number of turns of at least one of the primary transformer secondary windings is different from the number of turns of the other primary transformer secondary windings.

8. The high-frequency high-voltage transformer according to claim 6, characterized in that, The high-frequency high-voltage transformer includes multiple voltage multiplier rectifier units, and each lead of the secondary winding of the main transformer is connected to a voltage multiplier rectifier unit.

9. The high-frequency high-voltage transformer according to claim 6, characterized in that, An insulation structure is provided between two adjacent secondary windings of the main transformer on each of the isolation sleeves.

10. The high-frequency high-voltage transformer according to claim 1, characterized in that, The high-frequency high-voltage transformer includes a voltage divider sampling unit, which is used to measure the output voltage of the secondary winding of the main transformer; and / or, The high-frequency high-voltage transformer is vacuum-encapsulated with epoxy resin.

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