Power supply system and magnetron system for driving the magnetron

Abstract

This utility model relates to a power supply system for driving a magnetron and a magnetron system. The power supply system includes: a multi-phase AC input terminal for receiving multi-phase AC power; a DC output terminal for connecting to the magnetron; and multiple power modules for converting AC power into high-voltage DC power, wherein the input terminals of the multiple power modules are respectively connected to different phase lines of the multi-phase AC input terminal; wherein the output terminals of the multiple power modules are connected in parallel to the DC output terminal.

Description

Technical Field

[0001] This utility model relates to the field of microwave technology, and in particular to a power supply system and a magnetron system for driving a magnetron. Background Technology

[0002] In existing technologies, the design of microwave power supplies is closely related to their power rating. Low-power (e.g., less than 2KW) power supplies typically use single-phase input, either through a power frequency transformer, which has a simple structure but fixed power; or through electronic inverter technology, which allows for power adjustment but limits the power of individual units. For high-power (e.g., greater than 3KW) requirements, three-phase input is usually used, but the power supply system is often a customized, integrated design tailored to a specific power rating.

[0003] This existing technology has significant drawbacks. First, the system lacks flexibility and scalability. Power supply products of different power levels are incompatible, and users who require non-standard power or power upgrades must bear high customization or complete replacement costs. Second, directly connecting multiple high-voltage power supply units in parallel to increase the total power is impractical. Because it is difficult to achieve absolute consistency in the output voltage of each unit, direct parallel connection will cause huge inter-unit circulating currents, seriously affecting system efficiency and stability, and even leading to device damage. Therefore, there is an urgent need for a new high-power microwave power supply architecture. Utility Model Content

[0004] The purpose of this invention is to provide a power supply system and a magnetron system for driving magnetrons, thereby solving the technical problems of high development cost, long development cycle, poor scalability of high-power microwave power supplies, and difficulty in achieving grid load balancing and output voltage stability when multiple power supply units are connected in parallel.

[0005] The first aspect of this utility model discloses a power supply system for driving a magnetron, comprising:

[0006] Multiphase AC input terminal, for connecting multiphase AC power;

[0007] The DC output terminal is connected to the magnetron;

[0008] Multiple power modules are used to convert AC power into high-voltage DC power. The input terminals of the multiple power modules are respectively connected to different phase lines of the multi-phase AC input terminal.

[0009] The output terminals of multiple power modules are connected in parallel to the DC output terminal.

[0010] According to the power supply system of the first aspect of the present invention, the output terminals of multiple power modules are connected in parallel to the DC output terminal via their respective unidirectional conducting elements connected in series.

[0011] According to the power supply system of the first aspect of this utility model, the unidirectional conducting element is a high-voltage diode, and multiple unidirectional conducting elements are connected in parallel to the DC output terminal in a common anode configuration.

[0012] The power supply system according to the first aspect of this utility model further includes a control module configured as follows:

[0013] Monitor the output voltage of each power module;

[0014] Based on the output voltage, the input power of the corresponding power supply module is adjusted to balance the output voltage of multiple power supply modules.

[0015] According to the power supply system of the first aspect of this utility model, the multi-phase AC input terminal is a three-phase AC input terminal, and the input terminal of the power supply module is also connected to the neutral line.

[0016] According to the power supply system of the first aspect of the present invention, there are 3N power supply modules, and the input terminals of each N power supply modules are connected to different phase lines, where N is a positive integer.

[0017] According to the power supply system of the first aspect of this utility model, the power supply module also has a grounding terminal.

[0018] The second aspect of this utility model discloses a magnetron system including a power supply system, a filament transformer, and a magnetron according to the first aspect of this utility model;

[0019] The DC output terminal of the power supply system is connected to the secondary winding terminal of the filament transformer, and the secondary winding terminal of the filament transformer is connected to the filament terminal of the magnetron.

[0020] The DC output terminal of the power supply system is also connected to the cathode of the magnetron;

[0021] The anode of the magnetron is grounded.

[0022] The main differences and effects of this utility model embodiment compared with the prior art are as follows:

[0023] The power supply system of this invention employs multiple power modules, with their input terminals connected to different phase lines of the multi-phase AC input terminal. Therefore, the total system power is evenly distributed across all phases of the power grid. This avoids the significant impact and imbalance caused to a single phase of the power grid by using a single high-power single-phase power supply, achieving good three-phase load balance.

[0024] This utility model's power supply system uses multiple low-power power modules connected in parallel to form a high-power power supply. Therefore, it can utilize commercially available, mature, standardized, low-cost low-power modules for "modular" assembly. This greatly shortens the development cycle of high-power power supplies for different power requirements, reduces R&D and manufacturing costs, and provides great flexibility for subsequent maintenance and power expansion.

[0025] The power supply system of this invention features multiple power modules connected in parallel at their output terminals, with each module powered by a different phase line. Therefore, the DC voltage obtained at the parallel DC output terminals is equivalent to multi-phase rectification. Compared to the output of a single power module, its DC voltage has less ripple and lower harmonic content. This high-quality DC power supply to the load is beneficial for the stable operation of the load (such as a magnetron).

[0026] The output terminals of each power module in this power supply system are connected in parallel via their respective series-connected unidirectional conducting elements (such as high-voltage diodes). Therefore, these unidirectional conducting elements provide reverse isolation. This effectively prevents circulating current or reverse current between modules caused by slight differences in the output voltage of each module, protecting each power module and ensuring the stability and reliability of the parallel system.

[0027] This invention also includes a control module that monitors the output voltage of each power module and adjusts its power accordingly. Therefore, the system can actively and dynamically bring the output voltages of all parallel modules into a uniform manner. This fundamentally solves the current sharing problem of parallel modules, ensuring that each module contributes power as needed, avoiding overload or no-load situations for individual modules, and thus maximizing the operational stability and lifespan of the entire power system.

[0028] The magnetron system of this invention adopts the power supply system described in the first aspect of this invention. The magnetron can obtain a high-voltage DC power supply that is balanced by a three-phase power grid, has small voltage ripple, and is extremely stable. This ensures that the magnetron can generate microwave energy efficiently and stably, and helps to extend the service life of the magnetron itself. Attached Figure Description

[0029] Figure 1 A structural block diagram of a power supply system for driving a magnetron according to an embodiment of this application is shown.

[0030] Figure 2 A structural block diagram of a power supply system for driving a magnetron according to another embodiment of this application is shown.

[0031] Figure 3 A schematic diagram of the overall connection of a magnetron system according to an embodiment of this application is shown.

[0032] Figure 4 A structural block diagram of a power supply system for driving a magnetron according to another embodiment of this application is shown.

[0033] Figure 5 A structural block diagram of a power supply system for driving a magnetron according to another embodiment of this application is shown. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] Figure 1 and Figure 2 A design block diagram of a power supply system for driving a magnetron according to an embodiment of this application is shown. This power supply system employs a modular, building-block design, aiming to provide a stable and scalable high-power microwave power supply solution.

[0036] In one specific embodiment, the power system includes a multi-phase AC input terminal for connecting to mains power. This multi-phase AC input terminal is a three-phase five-wire input terminal, specifically including phase A, phase B, phase C, neutral, and protective earth (PE) wire.

[0037] The power system also includes multiple power modules, such as Figure 1 and Figure 2 The power modules 110, 120, and 130 shown are power modules that convert input AC power into high-voltage DC power, hence they are also called high-voltage units. Each power module is an independent power unit, and its input terminal is connected to different phase lines of the multi-phase AC input terminal. Each power module may also have a ground terminal.

[0038] Specifically, the input terminal INa of power module 110 is connected to the A-phase line and the neutral line, the input terminal INb of power module 120 is connected to the B-phase line and the neutral line, and the input terminal INc of power module 130 is connected to the C-phase line and the neutral line.

[0039] In some embodiments, to obtain greater output power, 3N power modules can be used, where N is a positive integer. The input terminals of every N power modules are connected in parallel and then connected to a phase line and the neutral line of a three-phase AC power supply. For example, Figure 2N power modules are shown: power module 110, power module 110-2, ..., power module 110-N form a power module group 11 corresponding to phase A. Similar to the case where the input terminal Ina of power module 110 is connected to phase A and the neutral line, the input terminals of power modules 110-2, ..., power modules 110-N are also connected to phase A and the neutral line. Similarly, N power modules, including power module 120, form a power module group 12 corresponding to phase B (other power modules besides power module 120 are not shown), and N power modules, including power module 130, form a power module group 13 corresponding to phase C (other power modules besides power module 130 are not shown). In this multi-module parallel configuration, the control module 17 can uniformly control the N power modules (e.g., power module group 11) on the same phase line, that is, monitor the overall output characteristics of the group and send a unified power regulation signal. As another, more refined control scheme, the control module 17 can also independently monitor the voltage and regulate the power of each power module in the group, thereby achieving better current and voltage sharing effects and further improving the stability and redundancy of the system.

[0040] The outputs of multiple power modules are connected in parallel to form a unified DC output terminal OUTp, which is ultimately connected to the load, for example, Figure 4 Based on Figure 1 A schematic diagram of a more specific embodiment of the illustrated embodiment is shown. Figure 5 Based on Figure 2 A schematic diagram of a more specific embodiment of the illustrated example. Figure 4 and Figure 5 The DC output terminal OUTp is shown to be connected to the magnetron 33; specifically, the DC output terminal OUTp is connected to the cathode of the magnetron 33, and the anode of the magnetron 33 is connected to the PE protective ground wire.

[0041] To prevent circulating current or reverse current from occurring due to inconsistent output voltages between power modules caused by manufacturing tolerances or differences in operating conditions, in some embodiments of this application, a unidirectional conducting element is connected in series between the output terminal of each power module and the final parallel node. In this embodiment, such as... Figure 1 and 2As shown, the cathode of the first high-voltage diode 14 is connected to the output terminal OUTa of the power module 110, and the anode is connected to the DC output terminal OUTp; the cathode of the second high-voltage diode 15 is connected to the output terminal OUTb of the power module 120, and the anode is connected to the DC output terminal OUTp; the cathode of the third high-voltage diode 16 is connected to the output terminal OUTc of the power module 130, and the anode is connected to the DC output terminal OUTp. That is, the first high-voltage diode 14, the second high-voltage diode 15, and the third high-voltage diode 16 are connected in parallel with a common anode, and their common anode constitutes the DC output terminal OUTp of the entire power system. This topology ensures that current can only flow from each power module to the load, effectively isolating the modules and improving the stability and reliability of the system.

[0042] In some embodiments, the power system further includes a control module 17. This control module 17 is configured to monitor the output voltage of each power module. Figure 1 and Figure 2 As shown, a high-voltage feedback line is led from the cathode of each high-voltage diode, i.e., the output terminal of each power module, to the control module 17. The control module 17 receives these high-voltage feedback signals, thereby obtaining the actual output voltage value of each power module in real time.

[0043] Based on the monitored output voltage, control module 17 generates and sends a power adjustment signal to the corresponding power module. This power adjustment signal can be an analog voltage signal or a digital command sent via a digital communication bus (e.g., CAN bus or RS485 bus). Upon receiving this signal, the controller inside the power module adjusts the duty cycle, switching frequency, or other control parameters of its internal switching converter to change its output power, thereby precisely regulating its output voltage. For example, if control module 17 detects that the output voltage of power module 110 is too high, it will send a control signal to reduce the input or output power of power module 110; conversely, if it detects that the voltage is too low, it will send a signal to increase its power. Through this closed-loop feedback control, the power of each power module can be dynamically adjusted to make the output voltage of all power modules tend to be consistent, achieving automatic output voltage balance.

[0044] This application also discloses a magnetron system, such as Figure 3 As shown, the system includes a power supply system 31, a filament transformer 32, and a magnetron 33 according to an embodiment of this application. The electrical energy at the DC output terminal OUTp of the power supply system (i.e., the common anode of the first high-voltage diode 14, the second high-voltage diode 15, and the third high-voltage diode 16) is used to drive the magnetron 33.

[0045] The specific connection method is as follows: The DC output terminal OUTp of the power supply system is connected to the cathode terminal 33a of the magnetron 33, providing it with the high-voltage negative potential required for operation. Simultaneously, the filament transformer 32 in the system is used to heat the magnetron filament. The two ends of the primary winding (primary winding end) of the filament transformer 32 are connected to the control module 17, receiving the primary voltage input provided by it; alternatively, the filament transformer 32 can be driven by a separate filament power supply circuit (not shown), which can be integrated inside the power supply system 31 or used as an external unit, typically providing low-voltage AC power. The secondary winding (secondary winding end) of the filament transformer 32 is connected to the DC output terminal OUTp and the two ends of the filament terminal 33b of the magnetron 33, providing the required low-voltage high current for heating the magnetron filament.

[0046] According to some embodiments of this application, the power supply input of the control module is a single-phase power input. Specifically, the control module 17 is connected to one phase line of phases A, B, and C, as well as the neutral line; for example, Figure 3 , Figure 4 and Figure 5 The control module 17 is shown connected to the C-phase line and the neutral line.

[0047] According to some embodiments of this application, the power module is also connected to the PE protective ground wire, and the anode of the magnetron is also connected to the circuit connecting the power module and the PE protective ground wire. For example, Figure 3 , Figure 4 and Figure 5 It is shown that power modules 110, 120, and 130 are connected to the PE protective ground wire, and their PE connection loop is also connected to the anode of the magnetron 33. Figure 3 The anode of the magnetron 33 is its outer casing. Figure 4 and Figure 5 The anode of the magnetron 33 is shown in a box labeled "Anode". Figure 5 The diagram also shows that power modules 110-2, ..., 110-N in power module group 11 are also connected to the PE protective ground wire, and the circuit connected to the PE is also connected to the anode of the magnetron 33.

[0048] The operation of the magnetron system in this application is illustrated below: Three-phase AC power is input to power modules 110, 120, and 130 via phase A, B, C lines and the neutral line, respectively. Each power module independently converts the AC power (e.g., 220V AC mains power) into high-voltage DC power. These three high-voltage DC power supplies are then connected in parallel to OUTp after passing through their respective high-voltage diodes—first high-voltage diode 14, second high-voltage diode 15, and third high-voltage diode 16—to power the cathode and filament transformer 32 of the magnetron 33. During operation, the control module 17 continuously monitors the voltage values ​​of the three high-voltage DC power supplies, i.e., the voltage values ​​at the output terminals of power modules 110, 120, and 130; and continuously adjusts the power of power modules 110, 120, and 130 to ensure balanced output voltages, thereby guaranteeing the stability of the parallel output and the reliability of the magnetron 33.

[0049] The power supply system and its driven magnetron system provided in this application offer significant advantages. First, the modular design allows for the combination of readily available low-power power modules (e.g., single-phase power supplies less than 2kW) to quickly and flexibly build a high-power microwave power supply, significantly shortening the development cycle and reducing costs. Second, because the power units draw power evenly from each phase of the three-phase power grid, the grid load is balanced, minimizing the impact on the grid. Third, the parallel high-voltage DC output of multiple power modules effectively increases the number of rectified phases, resulting in lower ripple and harmonics in the high-voltage DC output to the magnetron, promoting stable and efficient operation and extending its lifespan. Finally, the introduction of a feedback control module enables automatic voltage balancing of the parallel units, solving key technical challenges in modular parallel operation and ensuring the stability and reliability of the entire system.

[0050] It should be understood that although the terms "first," "second," etc., may be used herein to describe various features, these features should not be limited by these terms. The use of these terms is merely for distinction and should not be construed as indicating or implying relative importance. For example, without departing from the scope of the exemplary embodiments, a first feature may be referred to as a second feature, and similarly, a second feature may be referred to as a first feature.

[0051] In the description of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0052] The illustrative embodiments of this application include, but are not limited to, a power supply system and a magnetron system for driving the magnetron.

[0053] Various aspects of the illustrative embodiments will be described using terminology commonly employed by those skilled in the art to convey the essence of their work to others skilled in the art. However, it will be apparent to those skilled in the art that some alternative embodiments will be practiced using the features partially described. Specific figures and configurations are set forth for purposes of explanation in order to provide a more thorough understanding of the illustrative embodiments. However, it will be apparent to those skilled in the art that alternative embodiments may be practiced without specific details. In some other instances, well-known features have been omitted or simplified herein to avoid obscuring the illustrative embodiments of this application.

[0054] Furthermore, the various operations will be described as multiple separate operations in a manner most conducive to understanding the illustrative embodiments; however, the order of description should not be construed as implying that these operations must depend on the order of description, and many of these operations may be performed in parallel, concurrently, or simultaneously. Moreover, the order of the operations may also be rearranged. The process may be terminated when the described operations are completed, but may also include additional steps not included in the figures. The process may correspond to a method, function, procedure, subroutine, subroutine, etc.

[0055] References to "an embodiment," "embodiment," "illustrative embodiment," etc., in this specification indicate that the described embodiment may include specific features, structures, or properties; however, each embodiment may or may not necessarily include specific features, structures, or properties. Furthermore, these phrases are not necessarily directed to the same embodiment. Additionally, when specific features are described in conjunction with specific embodiments, the knowledge of those skilled in the art can influence the combination of these features with other embodiments, whether or not those embodiments are explicitly described.

[0056] Unless the context otherwise specifies, the terms “comprising,” “having,” and “including” are synonyms. The phrase “A and / or B” means “(A), (B), or (A and B).”

[0057] As used herein, the term "module" may refer to, as part of, or include: a memory (shared, dedicated, or grouped), an application-specific integrated circuit (ASIC), electronic circuitry and / or a processor (shared, dedicated, or grouped), combinational logic circuitry, and / or other suitable components that provide the said functionality for running one or more software or firmware programs.

[0058] In the accompanying drawings, some structural or methodological features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order is not necessary. Rather, in some embodiments, these features may be illustrated in a manner and / or order different from that shown in the illustrative drawings. Furthermore, the inclusion of structural or methodological features in a particular drawing does not mean that all embodiments need to include such features; in some embodiments, these features may be omitted or may be combined with other features.

[0059] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions or programs carried or stored on one or more transient or non-transient machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors, etc. When the instructions or program are run by a machine, the machine may perform the various methods described above. For example, the instructions may be distributed via a network or other computer-readable media. Therefore, machine-readable media may include, but are not limited to, any mechanism for storing or transmitting information in a machine-readable (e.g., computer-readable) form, such as floppy disks, optical disks, optical disc read-only memories (CD-ROMs), magneto-optical disks, read-only memories (ROMs), random access memories (RAMs), erasable programmable read-only memories (EPROMs), electronically erasable programmable read-only memories (EEPROMs), magnetic cards or optical cards, or flash memory or tangible machine-readable storage for transmitting network information via electrical, optical, acoustic, or other forms of signals (e.g., carrier waves, infrared signals, digital signals, etc.). Therefore, machine-readable media includes any form of machine-readable medium suitable for storing or transmitting electronic instructions or machine (e.g., computer) readable information.

[0060] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, the use of the technical solutions of this application is not limited to the various applications mentioned in the embodiments of this application. Various structures and modifications can be easily implemented with reference to the technical solutions of this application to achieve the various beneficial effects mentioned herein. Within the scope of knowledge possessed by those skilled in the art, all changes made without departing from the spirit of this application should be considered within the scope of this patent application.

Claims

1. A power supply system for driving a magnetron, characterized by comprising: include: Multiphase AC input terminal, for connecting multiphase AC power; The DC output terminal is connected to the magnetron; Multiple power modules are used to convert AC power into high-voltage DC power, and the input terminals of the multiple power modules are respectively connected to different phase lines of the multi-phase AC input terminal; The output terminals of multiple power modules are connected in parallel to the DC output terminal.

2. The power supply system according to claim 1, characterized by The output terminals of multiple power modules are connected in parallel to the DC output terminal via their respective series-connected unidirectional conducting elements.

3. The power supply system of claim 2, wherein The unidirectional conducting element is a high-voltage diode, and multiple unidirectional conducting elements are connected in parallel to the DC output terminal in a common anode configuration.

4. The power supply system of claim 1, wherein It also includes a control module, which is configured as follows: Monitor the output voltage of each of the power modules; Based on the output voltage, the input power of the corresponding power supply module is adjusted to balance the output voltage of the multiple power supply modules.

5. The power supply system of claim 1, wherein The multiphase AC input terminal is a three-phase AC input terminal, and the input terminal of the power module is also connected to the neutral line.

6. The power supply system of claim 5, wherein The power supply module has 3N modules, and the input terminals of each N power supply module are connected to different phase lines, where N is a positive integer.

7. The power supply system of claim 1, wherein The power module also has a grounding terminal.

8. A magnetron system characterized by, Includes the power supply system, filament transformer, and magnetron according to any one of claims 1-7; The DC output terminal of the power supply system is connected to the secondary winding terminal of the filament transformer, and the secondary winding terminal of the filament transformer is connected to the filament terminal of the magnetron. The DC output terminal of the power supply system is also connected to the cathode terminal of the magnetron; The anode of the magnetron is grounded.

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