A filament power supply device and a low-energy electron accelerator

Abstract

The present application discloses a filament power supply device, comprising: a high-voltage power supply and a filament power supply, wherein the filament power supply and the filament are both suspended at the high-voltage output end of the high-voltage power supply; a sampling module disposed between the high-voltage power supply and the load for collecting the current load current; and a controller for obtaining the current load current and controlling the filament current of the filament power supply according to the current load current so that the current load current reaches the target load current. The present application can provide the power required for the filament of the load electron gun of the low-energy electron accelerator, has a fast response speed and high control efficiency, makes the output of the filament power supply device stable and reliable. Compared with the prior art, the present application does not need to adopt an independent power supply by a generator, and has a low operation and maintenance cost. The present application also discloses a low-energy electron accelerator, which has the above beneficial effects.

Description

Technical Field

[0001] The present application relates to the field of electron accelerators, and particularly to a filament power supply device and a low-energy electron accelerator. Background Art

[0002] An industrial irradiation electron accelerator refers to an electron accelerator device mainly used in industrial production processes such as irradiating various materials, participating in chemical reactions, and sterilization and disinfection. Among them, the most widely used are high-frequency high-voltage electron accelerators and resonant transformer electron accelerators. Their beam current is formed by electrons emitted after the cathode of the electron gun is heated and then extracted into a beam by the extraction electrode at the upper end of the acceleration tube and accelerated by a high-voltage electric field in the acceleration tube. The electron gun is installed at the top of the acceleration tube and is at the highest potential of the accelerator. To supply power to the filament of the electron gun at a high potential, usually two methods are adopted: one is to transmit energy to the heating circuit of the electron gun at a high potential through capacitive coupling. The disadvantage is that if the terminal voltage of the accelerator needs to change frequently according to the irradiation task, when the accelerator operates at a low voltage (low energy section), the voltage generated by electromagnetic coupling may be too low, resulting in insufficient heating current of the electron gun and limiting the maximum output beam current; the other is to use an independent power supply generator, which can be unaffected by high voltage. The disadvantage is that there are long-term high-speed rotating components, which are vulnerable parts and need to be replaced regularly.

[0003] Therefore, how to provide a solution to the above technical problems is what those skilled in the art need to solve currently. Summary of the Invention

[0004] The purpose of the present application is to provide a filament power supply device that can provide the power required by the filament of the load electron gun of a low-energy electron accelerator, has a fast response speed, high control efficiency, makes the output of the filament power supply device stable and reliable. Compared with the prior art, the present application does not need to use an independent power supply generator, and has a low operation and maintenance cost; another purpose of the present application is to provide a low-energy electron accelerator including the above-mentioned filament power supply device.

[0005] To solve the above technical problems, the present application provides a filament power supply device, including:

[0006] A high-voltage power supply and a filament power supply, where the filament power supply and the filament are both suspended at the high-voltage output end of the high-voltage power supply;

[0007] A sampling module provided between the high-voltage power supply and the load, for collecting the current load current;

[0008] A controller, for obtaining the current load current and controlling the filament current of the filament power supply according to the current load current, so that the current load current reaches the target load current.

[0009] Preferably, the controller is further configured to obtain the current filament current of the filament power supply.

[0010] Preferably, the filament power supply device further includes:

[0011] a monitoring module configured to prompt information corresponding to the current filament current and information corresponding to the current load current.

[0012] Preferably, the monitoring module is specifically configured to receive, via an optical fiber, information corresponding to the current filament current and information corresponding to the current load current and then prompt.

[0013] Preferably, the controller is specifically configured to perform PID regulation on the current load current to obtain a target filament current value, and generate a PWM signal corresponding to the target filament current value, so as to control the filament current of the filament power supply through the PWM signal.

[0014] Preferably, the filament power supply device further includes:

[0015] a high-voltage isolation module disposed between the monitoring module and the filament power supply;

[0016] The filament power supply is configured to supply power to the high-voltage isolation module.

[0017] Preferably, the high-voltage isolation module includes an isolation transformer.

[0018] Preferably, the filament power supply includes a rectification and filtering module, a half-bridge inversion module, a synchronous rectification module, and an output module connected in sequence, where:

[0019] The input end of the rectification and filtering module is connected to the high-voltage output end of the high-voltage power supply, and the output end of the output module is connected to the filament.

[0020] To solve the above technical problems, the present application further provides a low-energy electron accelerator, including the filament power supply device described in any one of the above.

[0021] The present application provides a filament power supply device. The filament power supply and the filament are suspended at the high-voltage output end of a high-voltage power supply to provide the power required for the filament of a load electron gun of a low-energy electron accelerator. The current load current is obtained through a sampling module, and the controller performs closed-loop control on the filament current output by the filament power supply according to the current load current, so that the current load current reaches a target load current, providing the required power for the filament. The response speed is fast, the control efficiency is high, and the output of the filament power supply device is stable and reliable. Compared with the prior art, the present application does not require an independent power supply by a generator, and the operation and maintenance cost is low. The present application further provides a low-energy electron accelerator, which has the same beneficial effects as the above-mentioned filament power supply device. Description of the Drawings

[0022] To more clearly illustrate the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0023] Figure 1 Schematic structural diagram of a filament power supply device provided by the present application;

[0024] Figure 2 Schematic structural diagram of a filament power supply provided by the present application. Specific embodiments

[0025] The core of the present application is to provide a filament power supply device that can provide the power required for the filament of the electron gun in the load of a low-energy electron accelerator, with a fast response speed and high control efficiency, making the output of the filament power supply device stable and reliable. Compared with the prior art, the present application does not require independent power supply by a generator, and has low operation and maintenance costs; another core of the present application is to provide a low-energy electron accelerator including the above-mentioned filament power supply device.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0027] Please refer to Figure 1 , Figure 1 Schematic structural diagram of a filament power supply device provided by the present application. The filament power supply device includes:

[0028] A high-voltage power supply 1 and a filament power supply 2, and the filament power supply 2 and the filament are both suspended at the high-voltage output terminal of the high-voltage power supply 1;

[0029] A sampling module 3 provided between the high-voltage power supply 1 and the load for collecting the current load current;

[0030] A controller 4 for obtaining the current load current and controlling the filament current of the filament power supply 2 according to the current load current so that the current load current reaches the target load current.

[0031] Specifically, the filament power supply device provided by the present application may specifically include components such as a controller 4, a high-voltage power supply 1, a filament power supply 2, an electron gun, an accelerating tube, and a main steel cylinder. Among them, the filament power supply 2, the high-voltage power supply 1, the accelerating tube, and the electron gun are installed together in a sealed accelerator steel cylinder and filled with an inert gas for insulation.

[0032] Among them, the high-voltage power supply 1 is the step-up tower part and is independent of the filament power supply 2. The filament power supply 2 is used to supply power to the filament. In this application, the filament power supply 2 adopts a floating high-voltage setting, specifically achieved by connecting the low-voltage end of the filament power supply 2 to the output end of the high-voltage power supply 1 to provide the power required for the filament of the low-energy electron accelerator load electron gun. The floating high-voltage means that both the filament power supply 2 and the filament are floating at the high-voltage end output by the high-voltage power supply 1. The voltage of the low-voltage end of the filament power supply 2 relative to the ground is the output voltage of the high-voltage power supply 1, and the voltage of the high-voltage end of the filament relative to the low-voltage end of the filament power supply 2 is +5V (the filament power supply 2 is DC 0 - 5V).

[0033] Specifically, the load current control is achieved by adjusting the filament current. The controller 4 performs a PID operation on the load current collected by the sampling module 3 and the target load current pre-stored in the controller 4 to obtain the target filament current value, and adjusts the PWM signal for controlling the switching tube in the filament power supply 2 according to the target filament current value to achieve filament current control, thereby achieving load current control.

[0034] Furthermore, the control isolation of the filament power supply 2 adopts optical fiber isolation, the main power isolation adopts dry-type high-voltage transformer isolation, the high-voltage isolation transformer adopts a special customized structure, and the medium-high frequency inversion technology is used. The control terminal isolation adopts optical fiber isolation. The sampling module 3 can specifically be an optically isolated sampling module, and the isolated power supply for the optically isolated sampling module is provided by the auxiliary winding of the high-voltage isolation transformer. The isolation transformer of the filament power supply 2 is placed on the top of the sealed steel structure, the low-voltage end is at the top, and the output is at the lower end. Its optically isolated sampling circuit is also located therein. The insulation method adopts silicone rubber potting, and the heat dissipation method adopts forced air cooling, and the fan is located at the lowest end of the device.

[0035] Refer to Figure 2 as shown in Figure 2 which is a schematic structural diagram of a filament power supply 2 provided by this application. The filament power supply 2 can include a rectifier filter module, a half-bridge inverter module, a synchronous rectification module, and an output module. Specifically, the rectifier filter module includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. The half-bridge inverter module includes a first switching tube Q1, a second switching tube Q2, and a transformer T1. The synchronous rectification module includes a third switching tube Q3 and a fourth switching tube Q4. The output module includes an inductor L, a third capacitor C3, and a load RL, where:

[0036] The first end of the first resistor R1 is respectively connected to the first end of the first capacitor C1 and the first end of the first switching tube Q1, and their common terminal serves as the input terminal Vin of the filament power supply 2. The second end of the first resistor R1 is respectively connected to the first end of the second resistor R2, the first end of the second capacitor C2, the second end of the first capacitor C1, and the second end of the primary side of the transformer T1. The second end of the first switching tube Q1 is respectively connected to the first end of the second switching tube Q2 and the first end of the primary side of the transformer T1. The second ends of the second resistor R2, the second capacitor C2, and the second switching tube Q2 are all grounded. The third end of the secondary side of the transformer T1 is respectively connected to the first end of the third switching tube Q3 and the drive terminal of the fourth switching tube Q4. The fifth end of the secondary side of the transformer T1 is respectively connected to the drive terminal of the third switching tube Q3 and the first end of the fourth switching tube Q4. The second end of the third switching tube Q3 is respectively connected to the second end of the fourth switching tube Q4, the second end of the third capacitor C3, and the second end of the load RL. The fourth end of the transformer T1 is connected to the first end of the inductor L. The second end of the inductor L is respectively connected to the first end of the third capacitor C3 and the second end of the load RL. Among them, the fourth end of the transformer T1 is the common terminal of the two windings on the secondary side of the transformer T1.

[0037] It can be understood that the PWM signal output by the controller 4 is used to control the conduction or cut-off of the first switching tube Q1 and the second switching tube Q2 in the half-bridge inverter module, thereby controlling the filament current output by the filament power supply 2.

[0038] This application provides a filament power supply device. The filament power supply and the filament are suspended at the high-voltage output terminal of the high-voltage power supply to provide the power required for the filament of the electron gun of the low-energy electron accelerator load. The current load current of the vacuum chamber is obtained through the sampling module, and the controller performs closed-loop control on the filament current output by the filament power supply according to the current load current, so that the current load current reaches the target load current. The response speed is fast and the control efficiency is high, making the output of the filament power supply device stable and reliable. Compared with the prior art, this application does not require an independent power supply by a generator, and the operation and maintenance cost is low.

[0039] Based on the above embodiments:

[0040] As a preferred embodiment, the controller 4 is further configured to obtain the current filament current of the filament power supply 2.

[0041] As a preferred embodiment, the filament power supply device further includes:

[0042] A monitoring module 5 for prompting information corresponding to the current filament current and information corresponding to the current load current.

[0043] As a preferred embodiment, the monitoring module 5 is specifically configured to receive and prompt information corresponding to the current filament current and information corresponding to the current load current through an optical fiber.

[0044] Specifically, the monitoring module 5 provided in this application includes a ProfiNet to RS485 unit, an electro-optical and opto-electronic conversion unit, etc. The monitoring module 5 and the controller 4 are connected by an optical fiber to control and monitor the state of the high-voltage suspended filament power supply 2. At the same time, the monitoring module 5 can also control and monitor the state of the high-voltage power supply 1 through the RS485 interface.

[0045] Specifically, the controller 4 outputs the acquired current filament current and / or current load current to the monitoring module 5 through the optical fiber, so that the monitoring module 5 can prompt the information corresponding to the current filament current and the information corresponding to the current load current.

[0046] Specifically, the monitoring module 5 sets the load voltage and load current through RS485 communication to control the output state of the filament power supply.

[0047] As a preferred embodiment, referring to Figure 1 as shown, the filament power supply device further includes:

[0048] A high-voltage isolation module 6 provided between the monitoring module 5 and the filament power supply 2;

[0049] The filament power supply 2 is used to supply power to the high-voltage isolation module 6.

[0050] As a preferred embodiment, the high-voltage isolation module 6 includes an isolation transformer.

[0051] Specifically, the high-voltage isolation module 6 uses an isolation transformer. Its magnetic core skeleton structure is manufactured by 3D printing, installed and fixed, and then potted with silicone rubber, which can meet the high-voltage electrical isolation of 250 kV. Specifically, the filament power supply 2 supplies power to the high-voltage isolation module 6 so that the high-voltage isolation module 6 can perform its functions, and there is no need to separately set up a power supply device for the high-voltage isolation module 6, reducing the hardware cost.

[0052] On the other hand, this application also provides a low-energy electron accelerator, including the filament power supply device described in any one of the above.

[0053] A low-energy electron accelerator provided by this application has the same beneficial effects as the above-mentioned filament power supply device.

[0054] For the introduction of the low-energy electron accelerator provided by this application, please refer to the above embodiments, and this application will not be elaborated here.

[0055] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filament power supply device for a low-energy electron accelerator, characterized in that, Comprising: A high-voltage power supply and a filament power supply, wherein the filament power supply and the filament are both suspended at the high-voltage output terminal of the high-voltage power supply; A sampling module provided between the high-voltage power supply and the load, for collecting the current load current of the vacuum chamber; A controller, for obtaining the current load current and controlling the filament current of the filament power supply according to the current load current, so that the current load current reaches the target load current; The controller is specifically configured to perform PID regulation on the current load current to obtain a target filament current value, generate a PWM signal corresponding to the target filament current value, so as to control the filament current of the filament power supply through the PWM signal.

2. The filament power supply device of the low-energy electron accelerator according to claim 1, characterized in that, The controller is further configured to obtain the current filament current of the filament power supply.

3. The filament power supply device of the low-energy electron accelerator according to claim 2, characterized in that, The filament power supply device of the low-energy electron accelerator further comprises: A monitoring module, for prompting information corresponding to the current filament current and information corresponding to the current load current.

4. The filament power supply device of the low-energy electron accelerator according to claim 3, characterized in that, The monitoring module is specifically configured to receive and prompt information corresponding to the current filament current and information corresponding to the current load current through an optical fiber.

5. The filament power supply device of the low-energy electron accelerator according to claim 3, characterized in that, The filament power supply device of the low-energy electron accelerator further comprises: A high-voltage isolation module provided between the monitoring module and the filament power supply; The filament power supply is used to supply power to the high-voltage isolation module.

6. The filament power supply device of the low-energy electron accelerator according to claim 5, characterized in that, The high-voltage isolation module includes an isolation transformer.

7. The filament power supply device of the low-energy electron accelerator according to any one of claims 1-6, characterized in that The filament power supply includes a rectification and filtering module, a half-bridge inverter module, a synchronous rectification module and an output module connected in sequence, wherein: The input end of the rectification and filtering module is connected to the high-voltage output terminal of the high-voltage power supply, and the output end of the output module is connected to the filament.

8. A low-energy electron accelerator, characterized in that, Comprising the filament power supply device of the low-energy electron accelerator according to any one of claims 1-7.

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