Power supply system and electron accelerator powered by same
By introducing IGBT units and LLC series resonant circuits into the electronic accelerator power supply system, the problem that traditional power supply systems cannot adjust the output frequency is solved, efficient and low-noise power supply is achieved, and the overall performance of the electronic accelerator is improved.
Patent Information
- Application Number
- CN202420459757.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-11
AI Technical Summary
The high-voltage transformer electronic accelerator powered by traditional medium-frequency generator sets cannot adjust the output frequency, which limits the electric field acceleration efficiency.
The power supply system is adopted that includes a three-phase power inlet module, a rectifier module and an inverter module. The LLC series resonant circuit is formed through an IGBT unit, a matching capacitor, a matching inductor and a primary coil to achieve frequency adjustment of the circuit and efficient power supply.
Improves the working efficiency of electronic accelerators, reduces noise, improves energy utilization, and reduces equipment costs.
Smart Images
Figure CN222674152U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electron accelerators, in particular to a power supply system and an electron accelerator powered by the power supply system. Background Art
[0002] Most of the domestic high-voltage transformer-type electron accelerators are medium-energy, and are favored by users because of their simple operation, small footprint, and simple protection. High-voltage transformer-type accelerators accelerate particles through the electric field generated by coupling transformers to achieve a certain speed for irradiation processing of objects. Therefore, a high-power high-voltage generator with a specific frequency voltage input is required to meet the above requirements.
[0003] High-voltage transformer-type electron accelerators accelerate electrons by increasing the input low voltage to high voltage through the coupling of the primary coil and the secondary coil, so the quality of the input low voltage is crucial. Traditionally, medium-frequency generator sets are used for power supply. The medium-frequency generator set consists of a motor and a generator. The two coaxially drive the generator through the rotation of the motor. The coil on the generator rotates at a specific frequency to cut the magnetic flux lines to generate a sinusoidal voltage input into the primary coil. Since the speed of the coil cannot be adjusted, the output frequency is relatively fixed and cannot be adjusted.
[0004] Therefore, there is a need for a power supply system and an electron accelerator powered by an additional LLC series resonant circuit, which can make the entire circuit work near the series resonance point and improve the overall working efficiency. Summary of the invention
[0005] In order to overcome the deficiencies of the prior art, the utility model provides a power supply system and an electron accelerator powered by the power supply system.
[0006] The technical solution of the utility model is as follows:
[0007] A power supply system comprises a three-phase power supply module, a rectifier module and an inverter module connected in sequence, wherein the output end of the inverter module is connected to the primary coil of an electron accelerator to supply power to the electron accelerator, a matching capacitor and a matching inductor are provided between the inverter module and the primary coil, and the matching capacitor, the matching inductor and the primary coil are combined to form an LLC series resonant circuit.
[0008] As a further improvement of the present invention, the inverter module includes an IGBT unit and a program control unit for controlling the on and off of the IGBT unit.
[0009] As a further improvement of the present invention, the IGBT unit includes four IGBTs, and all the IGBTs are combined into a full-bridge inverter topology.
[0010] As a further improvement of the present invention, the duty cycle of the IGBT is less than 0.5.
[0011] As a further improvement of the present invention, the duty cycle of the IGBT is 0.45.
[0012] As a further improvement of the present invention, the capacitance value of the matching capacitor is adjustable, and the inductance value of the matching inductor is adjustable.
[0013] As a further improvement of the present invention, the inductance value of the matching inductor is L S , the capacitance value of the matching capacitor is C:
[0014]
[0015] Among them, L r is the inductance of the primary coil, r is the equivalent resistance of the primary coil, ω is the resonant frequency of the primary coil, P is the maximum power of the primary coil, and u1 is the fundamental voltage amplitude of the square wave voltage output by the inverter module.
[0016] As a further improvement of the present invention, the value range of the matching capacitor is 0.95C-1.05C, and the value range of the matching inductor is 0.95L S -1.05L S .
[0017] As a further improvement of the present invention, the rectifier module is a rectifier silicon stack.
[0018] An electron accelerator comprises a primary coil and a secondary coil for voltage transformation, wherein the primary coil is electrically connected to the power supply system.
[0019] According to the utility model of the above scheme, the beneficial effects of the utility model are:
[0020] The utility model adopts IGBT on-off control to control the output voltage of the rectifier circuit, replacing the traditional motor and generator, which can effectively reduce noise while improving energy utilization and reducing costs; the LLC series resonant circuit is formed by using the matching capacitor, matching inductor and the primary coil of the electron accelerator of the power supply system so that the entire circuit works near the series resonance point, thereby improving the overall working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of the utility model;
[0022] Figure 2 It is a circuit diagram of the utility model. DETAILED DESCRIPTION
[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0026] See also Figure 1 and Figure 2The utility model provides a power supply system, including a three-phase power supply module, a rectifier module and an inverter module connected in sequence. Preferably, the rectifier module is composed of a rectifier silicon stack. The output end of the inverter module is connected to the primary coil of the electron accelerator to power the electron accelerator. A matching capacitor and a matching inductor are provided between the inverter module and the primary coil. The matching capacitor, the matching inductor and the primary coil form an LLC series resonant circuit. The capacitance value of the matching capacitor is adjustable, and the inductance value of the matching inductor is adjustable. The utility model uses the matching capacitor, the matching inductor and the primary coil of the electron accelerator provided by the power supply system to form an LLC series resonant circuit. Since the inductance of the primary coil is fixed, by adjusting the values of the matching inductor and the matching capacitor, not only can the circuit as a whole work near the series resonance point, but also the waveform input can be made sinusoidal, which not only meets the demand for high coupling, but also improves the overall work efficiency. Finally, the magnetic field generated by the alternating current input to the primary coil of the electron accelerator is coupled with the secondary coil of the electron accelerator, and a high voltage is generated in the secondary coil to accelerate the electron beam, thereby meeting the irradiation demand of the electron accelerator.
[0027] As an embodiment of the present invention, the inductance value of the matching inductor is L S , the capacitance value of the matching capacitor is C:
[0028]
[0029]
[0030] Among them, L r is the inductance of the primary coil, r is the equivalent resistance of the primary coil, ω is the resonant frequency of the primary coil, P is the maximum power of the primary coil, and u1 is the fundamental voltage amplitude of the square wave voltage output by the inverter module.
[0031] Preferably, L S and C are calculated values. When the calculated values are some complex values, it is difficult to buy matching capacitors and matching inductors with the same values on the market. Therefore, in the actual selection process, inductors with inductance values close to the calculated values are often selected as matching inductors, and capacitors with capacitance values close to the calculated values are selected as matching capacitors. The selection range of matching capacitors is 0.95C-1.05C, and the selection range of matching inductors is 0.95L S -1.05L S .
[0032] As an embodiment of the utility model, the inverter module includes an IGBT unit and a program control unit for controlling the on and off of the IGBT unit. The on and off of the IGBT unit is used to control the output voltage of the rectifier circuit. The power supply system with the IGBT unit as the core and the digital control and LLC series resonant circuit as the auxiliary supplies power to the electron accelerator, replacing the traditional motor and generator. It can not only avoid the noise generated by the motor and generator, but also reduce the steps of energy conversion and improve the energy utilization rate. At the same time, the whole equipment adopts standard parts, which reduces the use cost of the equipment; in addition, the power supply system adopts the LLC resonant circuit composed of matching capacitors, matching inductors and the primary coil of the electron accelerator, the IGBT unit, and the program control unit. It can not only effectively combine with the characteristics of the high-voltage transformer-type electron accelerator, but also there is no boost module in the whole power supply system. Instead, the high voltage generating part is placed inside the high-voltage transformer accelerator, which effectively reduces the volume of the whole power supply system. At the same time, since the high voltage exists inside the electron accelerator, the connection between the power supply system and the electron accelerator can be made with conventional cables, thereby replacing the currently commonly used high-voltage cables, effectively reducing the economic cost.
[0033] As an embodiment of the utility model, the IGBT unit includes four IGBTs, and all the IGBTs are combined into a full-bridge inverter topology. With the advancement of science and technology, power electronics technology has developed rapidly. By utilizing the IGBT full-bridge inverter topology, the phase-shifted PWM series inverter circuit can effectively change the output voltage and the pulse width of the output current after three-phase rectification, thereby achieving the purpose of adjusting the effective value of the output voltage and the output power.
[0034] See also Figure 2 , the four IGBTs are T1, T2, T3 and T4, matching inductor L S The first end is connected to point a between T1 and T3, matching inductor L S The second end of is connected to the first end of the primary coil, the second end of the primary coil is connected to point b between T2 and T4, and the matching capacitor C is connected in parallel at both ends of the primary coil, wherein the primary coil can be equivalent to an equivalent inductance L r and the equivalent resistance r in series.
[0035] The power supply principle of the utility model is as follows: the external three-phase alternating current first enters the power supply system through the three-phase power input module, and the three-phase alternating current is rectified into two-phase direct current output under the action of the rectifier silicon stack, and then flows into the IGBT unit. During this period, all the IGBTs are turned on by a trigger pulse slightly narrower than the working half cycle, and turned off by a trigger pulse slightly wider than the working half cycle, that is, the duty cycles of all the IGBTs are equal and are less than 0.5. Preferably, the duty cycle of the IGBT is 0.45. According to different types of electron accelerators, there is a slight deviation in the duty cycle of the IGBT, but they are all around 0.45. By fixing the trigger on time of T1 and T3, the on time of T2 and T4 is phase-shifted relative to T1 and T3, so that the phase difference between the start on time of the two groups of switches (T1 and T3 as one group, T2 and T4 as another group) changes continuously from 0-180°. This changes the pulse width and phase of the output voltage and output current, generating alternating current of corresponding frequency. Under the action of the LLC series resonant circuit composed of the matching inductor, matching capacitor and primary coil, by adjusting the values of the matching inductor and matching capacitor, the circuit works near the series resonance point and the wave input to the electron accelerator becomes sinusoidal, finally forming high voltage inside the electron accelerator.
[0036] The utility model provides an electron accelerator, comprising a primary coil and a secondary coil for voltage transformation, wherein the primary coil is electrically connected to the power supply system, and the primary coil and the secondary coil are arranged in the electron accelerator as a part of the electron accelerator, so that the power supply system and the electron accelerator can be electrically connected using a common cable, which can effectively reduce the use cost compared with the high-voltage cable used in conventional technology.
[0037] In summary, the utility model provides a power supply system and an electron accelerator powered by the same, wherein the LLC series resonant circuit is formed by using the matching capacitor, matching inductor and the primary coil of the electron accelerator provided by the power supply system. Since the inductance of the primary coil is fixed, by adjusting the values of the matching inductor and the matching capacitor, not only can the circuit as a whole work near the series resonance point, but also the input waveform can be made sinusoidal, which not only meets the demand for high coupling, but also improves the overall working efficiency. Finally, the magnetic field generated by the alternating current input to the primary coil of the electron accelerator is coupled with the secondary coil of the electron accelerator, and a high voltage is generated in the secondary coil to accelerate the electron beam, thereby meeting the irradiation demand of the electron accelerator; the output voltage of the rectifier circuit is controlled by the on-off of the IGBT unit, and the IGBT is used to control the output voltage of the rectifier circuit. The power supply system with BT unit as the core and digital control and LLC series resonant circuit as the auxiliary supplies power to the electron accelerator, replacing the traditional motor and generator. It can not only avoid the noise generated by the motor and generator, but also reduce the steps of energy conversion and improve energy utilization. At the same time, the whole equipment adopts standard parts, which reduces the use cost of the equipment. The power supply system can be effectively combined with the characteristics of the high-voltage transformer electron accelerator, and there is no boost module in the whole power supply system. Instead, the high voltage generating part is placed inside the high-voltage transformer accelerator, which effectively reduces the volume of the whole power supply system. At the same time, since the high voltage exists inside the electron accelerator, the power supply system and the electron accelerator can be connected with conventional cables, thereby replacing the currently commonly used high-voltage cables, effectively reducing the economic cost.
[0038] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A power supply system, characterized in that: It comprises a three-phase power supply module, a rectifier module and an inverter module which are connected in sequence. The output end of the inverter module is connected to the primary coil of the electron accelerator to supply power to the electron accelerator. A matching capacitor and a matching inductor are arranged between the inverter module and the primary coil. The matching capacitor, the matching inductor and the primary coil form an LLC series resonant circuit.
2. The power supply system according to claim 1, characterized in that: The inverter module includes an IGBT unit and a program control unit for controlling the on and off of the IGBT unit.
3. The power supply system according to claim 2, characterized in that: The IGBT unit includes four IGBTs, and all the IGBTs are combined into a full-bridge inverter topology.
4. The power supply system according to claim 3, characterized in that: The duty cycle of the IGBT is less than 0.
5.
5. The power supply system according to claim 4, characterized in that: The duty cycle of the IGBT is 0.
45.
6. The power supply system according to claim 1, characterized in that: The capacitance value of the matching capacitor is adjustable, and the inductance value of the matching inductor is adjustable.
7. The power supply system according to claim 6, characterized in that: The inductance value of the matching inductor is L S , the capacitance value of the matching capacitor is C: Among them, L r is the inductance of the primary coil, r is the equivalent resistance of the primary coil, ω is the resonant frequency of the primary coil, P is the maximum power of the primary coil, and u1 is the fundamental voltage amplitude of the square wave voltage output by the inverter module.
8. The power supply system according to claim 7, characterized in that: The value range of the matching capacitor is 0.95C-1.05C, and the value range of the matching inductor is 0.95L S -1.05L S .
9. The power supply system according to claim 1, characterized in that: The rectifier module is a rectifier silicon stack.
10. An electron accelerator, characterized in that: It comprises a primary coil and a secondary coil for voltage transformation, and the primary coil is electrically connected to the power supply system according to any one of claims 1-9.