Magnetron microwave source with electric field-magnetic field-filament collaborative control

Abstract

The application relates to the technical field of magnetron microwave emission, discloses a magnetron microwave source with electric field-magnetic field-filament synergic control, provides a specific test method of the highest efficiency working point in the magnetron power range and the magnetron microwave source with electric field-magnetic field-filament synergic control, and improves the efficiency, service life and stability of the magnetron; the output microwave power, the power supply power, the electric field, the magnetic field and the filament current during the operation of the magnetron are detected, the electric field current, the magnetic field current and the filament current are synergically controlled, three-dimensional parameter scanning is carried out, and the optimal efficiency point set in the operation range of the magnetron is obtained; during the operation, the power reference value is adjusted according to the microwave target power and the feedback power closed loop, and the optimal efficiency point corresponding to the reference power is obtained through the table lookup method; the electric field current, the magnetic field current and the filament current of the magnetron are dynamically adjusted, the filament current is always adjusted to the minimum value for maintaining the electron stable emission, and high-stable and high-efficiency microwave output is realized.

Description

Technical Field

[0001] This application relates to the field of magnetron microwave emission technology, specifically a magnetron microwave source with coordinated control of electric field, magnetic field, and filament. Background Technology

[0002] The magnetron microwave source of this embodiment is widely used in industrial production, medical treatment, radar communication and other fields. Traditional magnetron microwave sources control the output microwave energy by keeping the magnetic field constant and adjusting the electric field current and filament current separately, which is a separate and non-optimized control method.

[0003] Because the magnetic field strength corresponding to the magnetron's highest efficiency point changes with its power, a constant magnetic field method cannot achieve the magnetron's highest efficiency output across the entire power range. Furthermore, individually adjusting the electric field current and filament current makes it difficult to precisely control the filament current at the minimum point that guarantees power output. This can cause the filament to emit more electrons than required, resulting in excessively high filament temperatures, reduced magnetron efficiency, and shortened filament lifespan. Additionally, when the load changes, separate adjustment may lead to excessive adjustment of the electric field current, causing the magnetron to switch modes and affecting its stable operation.

[0004] Therefore, in order to improve the efficiency, stability and lifespan of magnetron microwave transmitters, it is essential to achieve a microwave source with coordinated control of electric field, magnetic field and filament. Summary of the Invention

[0005] The purpose of this application is to provide a magnetron microwave source with coordinated control of electric field, magnetic field and filament, so as to solve the technical problem of inefficiency of magnetron microwave sources caused by separate and non-optimized control in the prior art.

[0006] To achieve the above objectives, this application provides a magnetron microwave source with coordinated control of electric field, magnetic field, and filament. The source is characterized by offline parameter optimization based on a preset magnetron maximum efficiency operating point test method. Based on the offline parameter optimization results, the magnetron is driven to output microwaves through online closed-loop coordinated control. The magnetron maximum efficiency operating point test method is based on testing electric field voltage, electric field current, filament voltage, filament current, and microwave power. The online closed-loop coordinated control is based on the control of the electric field power supply, magnetic field power supply, and filament power supply.

[0007] Preferably, the parameters required for the offline parameter optimization and the online closed-loop coordinated control are obtained based on the state monitoring of the magnetron, and these parameters include at least the electric field voltage. electric field current Filament voltage Filament current Magnetic field and current and microwave power .

[0008] Preferably, the offline parameter optimization and the online closed-loop coordinated control include:

[0009] By scanning three-dimensional parameters through coordinated control of electric field, magnetic field and filament, the set of points with the highest efficiency within the working range of the magnetron can be obtained.

[0010] The closed-loop adjustment of the output power setting reference value is based on the target power and the actual power.

[0011] The reference value of the highest efficiency operating point corresponding to the set power is obtained by looking up a table.

[0012] Preferably, the method of obtaining the set of highest efficiency points within the magnetron's operating range through coordinated three-dimensional parameter scanning via electric field-magnetic field-filament control includes:

[0013] A1: Defines the range of magnetron output power, electric field current, filament current, and magnetic field current;

[0014] A2: Select the next target power for the magnetron;

[0015] A3: Enable the electric field power supply to operate in constant power output mode and adjust the magnetic field current. ;

[0016] A4: Adjust the electric field current This allows the magnetron's output power to reach the set value;

[0017] A5: Scanning filament current To ensure the minimum value that guarantees stable target microwave power output;

[0018] A6: Detecting electric field voltage electric field current Filament voltage Filament current and microwave power ;

[0019] A7: Calculate the magnetron efficiency ;

[0020] A8: Determine if this is the point of highest efficiency under the current magnetic field and current. If yes, execute A9; otherwise, execute A4.

[0021] A9: Determine if this is the highest efficiency point under the current power. If yes, execute A10; otherwise, execute A3.

[0022] A10: Record the optimal parameters under the current power, including the electric field current. Magnetic field and current and filament current ;

[0023] A11: Determine whether all the highest efficiency points within the working range have been obtained. If yes, proceed to the online closed-loop collaborative control; otherwise, execute A2.

[0024] As a preferred option, the magnetron efficiency calculation in A7 The calculation is based on a preset magnetron efficiency formula, which is:

[0025]

[0026] Among them, A8 to A11 find the point of highest efficiency through multi-level nested loop parameter scanning.

[0027] Preferably, the reference value for setting the closed-loop output power based on the target power and the actual power further includes, before that:

[0028] Based on A11, the control parameters corresponding to the highest efficiency point within the power range of the magnetron are obtained;

[0029] Set the target power for the magnetron microwave output.

[0030] Preferably, the reference value for the highest efficiency operating point includes the reference electric field current. Reference magnetic field current and reference filament current Based on the reference value of the highest efficiency operating point and the electric field current in the parameters. Magnetic field and current and filament current The coordinated control between them drives the magnetron to output microwaves.

[0031] Preferably, based on the reference electric field current With electric field current The closed-loop regulation of the electric field power supply stabilizes the microwave power at the set value.

[0032] Preferably, based on the reference magnetic field current With magnetic field and current Closed-loop regulating magnetic field power supply.

[0033] Preferably, based on the reference filament current With filament current The closed-loop regulation of the filament power supply maintains the filament current at the minimum value for stable microwave emission.

[0034] Beneficial Effects: This application presents a magnetron microwave source with coordinated electric field-magnetic field-filament control, providing a specific method for testing the highest efficiency operating point within the magnetron's power range, and a microwave source with coordinated electric field-magnetic field-filament control, thereby improving magnetron efficiency, lifespan, and stability. By detecting the output microwave power, power supply power, electric field, magnetic field, and filament current during magnetron operation, and performing a three-dimensional parameter scan to coordinately regulate the electric field current, magnetic field current, and filament current, the optimal set of efficiency points within the magnetron's operating range is obtained. During operation, the power reference value is adjusted in a closed loop based on the microwave target power and feedback power, and the optimal efficiency point corresponding to the reference power is obtained through a lookup table method. The magnetron's electric field current, magnetic field current, and filament current are dynamically adjusted, while the filament current is always adjusted to the minimum value necessary for stable electron emission, achieving highly stable and efficient microwave output. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a magnetron microwave source with coordinated electric field-magnetic field-filament control provided in an embodiment of this application;

[0037] Figure 2 A flowchart for offline parameter optimization of a magnetron microwave source with coordinated electric field-magnetic field-filament control provided in an embodiment of this application;

[0038] Figure 3 A flowchart illustrating the online closed-loop coordinated control of a magnetron microwave source with coordinated electric field-magnetic field-filament control, provided in an embodiment of this application.

[0039] Figure 4 Load characteristic curves of a magnetron microwave source with coordinated electric field-magnetic field-filament control provided in the embodiments of this application.

[0040] The implementation, functional features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The technical problem this embodiment aims to solve is that existing magnetron microwave transmitters rely solely on adjusting the electric field current and filament current for control, making it difficult for them to maintain high efficiency and stability across a wide power range and under varying load conditions. This embodiment discloses a magnetron microwave transmitter with coordinated electric field-magnetic field-filament control to improve the magnetron's operating efficiency, stability, and lifespan. In short, this embodiment employs a design that combines offline parameter optimization with online closed-loop coordinated control of the electric field-magnetic field-filament system to create a magnetron microwave transmitter with coordinated electric field-magnetic field-filament control.

[0044] Reference Figure 1 , Figure 1 A schematic diagram of a magnetron microwave source with coordinated control of electric field, magnetic field, and filament provided in an embodiment of this application.

[0045] like Figure 1 As shown, this embodiment discloses a magnetron microwave source with coordinated control of electric field, magnetic field, and filament. This magnetron microwave source performs offline parameter optimization based on a preset magnetron maximum efficiency operating point test method. Based on the results of the offline parameter optimization, the magnetron is driven to output microwaves through online closed-loop coordinated control. The magnetron maximum efficiency operating point test method is based on testing electric field voltage, electric field current, filament voltage, filament current, and microwave power. The online closed-loop coordinated control is based on the control of the electric field power supply, magnetic field power supply, and filament power supply.

[0046] Specifically, the parameters required for the offline parameter optimization and the online closed-loop coordinated control are obtained based on the state monitoring of the magnetron, and these parameters include at least the electric field voltage. electric field current Filament voltage Filament current Magnetic field and current and microwave power .

[0047] Specifically, the offline parameter optimization and the online closed-loop collaborative control include:

[0048] By scanning three-dimensional parameters through coordinated control of electric field, magnetic field and filament, the set of points with the highest efficiency within the working range of the magnetron can be obtained.

[0049] The closed-loop adjustment of the output power setting reference value is based on the target power and the actual power.

[0050] The reference value of the highest efficiency operating point corresponding to the set power is obtained by looking up a table.

[0051] Specifically, the method of obtaining the set of highest efficiency points within the magnetron's operating range through coordinated three-dimensional parameter scanning via electric field, magnetic field, and filament includes:

[0052] A1: Defines the range of magnetron output power, electric field current, filament current, and magnetic field current;

[0053] A2: Select the next target power for the magnetron;

[0054] A3: Enable the electric field power supply to operate in constant power output mode and adjust the magnetic field current. ;

[0055] A4: Adjust the electric field current This allows the magnetron's output power to reach the set value;

[0056] A5: Scanning filament current To ensure the minimum value that guarantees stable target microwave power output;

[0057] A6: Detecting electric field voltage electric field current Filament voltage Filament current and microwave power ;

[0058] A7: Calculate the magnetron efficiency ;

[0059] A8: Determine if this is the point of highest efficiency under the current magnetic field and current. If yes, execute A9; otherwise, execute A4.

[0060] A9: Determine if this is the highest efficiency point under the current power. If yes, execute A10; otherwise, execute A3.

[0061] A10: Record the optimal parameters under the current power, including the electric field current. Magnetic field and current and filament current ;

[0062] A11: Determine whether all the highest efficiency points within the working range have been obtained. If yes, proceed to the online closed-loop collaborative control; otherwise, execute A2.

[0063] Specifically, the calculation of magnetron efficiency in A7 The calculation is based on a preset magnetron efficiency formula, which is:

[0064]

[0065] Among them, A8 to A11 find the point of highest efficiency through multi-level nested loop parameter scanning.

[0066] Specifically, the reference value for closed-loop adjustment of the output power setting based on the target power and the actual power further includes, before that:

[0067] Based on A11, the control parameters corresponding to the highest efficiency point within the power range of the magnetron are obtained;

[0068] Set the target power for the magnetron microwave output.

[0069] Specifically, the reference value for the highest efficiency operating point includes the reference electric field current. Reference magnetic field current and reference filament current Based on the reference value of the highest efficiency operating point and the electric field current in the parameters. Magnetic field and current and filament current The coordinated control between them drives the magnetron to output microwaves.

[0070] Specifically, based on the reference electric field current With electric field current The closed-loop regulation of the electric field power supply stabilizes the microwave power at the set value.

[0071] Specifically, based on the reference magnetic field current With magnetic field and current Closed-loop regulating magnetic field power supply.

[0072] Specifically, based on the reference filament current With filament current The closed-loop regulation of the filament power supply maintains the filament current at the minimum value for stable microwave emission.

[0073] The specific application of this embodiment will now be described.

[0074] Reference Figure 2 , Figure 2 This is a flowchart of offline parameter optimization for a magnetron microwave source with coordinated electric field-magnetic field-filament control, provided in an embodiment of this application.

[0075] like Figure 2As shown, in the offline optimization phase, the operating power, electric field, filament, and magnetic field current ranges of the magnetron are first defined, followed by multi-layer nested loops for parameter scanning. During the optimization process for each target output power, the electric field power supply is operated in a constant power output mode. In this embodiment, the magnetron microwave source sequentially scans the electric field current. and magnetic field current And scan the filament current To ensure stable microwave output, the electric field voltage of the magnetron microwave source in this embodiment is monitored in real time during this process. electric field current Filament voltage Filament current and output microwave power Calculate the efficiency of the magnetron The highest efficiency point is found through multi-layered nested loop parameter scanning. The magnetron efficiency calculation formula is:

[0076]

[0077] The formula for calculating the efficiency of the magnetron designed in this embodiment will now be explained.

[0078] The input power of a magnetron is provided by three sources: an electric field power supply, a filament power supply, and a magnetic field power supply. The electric field power supply is the primary energy source for the magnetron. The filament power supply ensures stable electron emission from the filament, therefore its filament current is relatively large and cannot be ignored. The magnetic field power supply is only used to maintain the magnetic field strength within the magnetron cavity; both its voltage and current are relatively small. The power of the magnetic field power supply typically accounts for less than 1% of the magnetron's input power, therefore its power is negligible. Thus, the input power of the magnetron is calculated using the power of the electric field power supply. With filament power supply The sum is represented by the sum. The magnetron output power is directly calculated using the detected microwave power. express.

[0079] Because the magnetic field strength corresponding to the highest efficiency point of the magnetron varies with different power levels, and this magnetic field strength is controlled by the magnetic field current, maintaining the filament current at the minimum value necessary to ensure stable operation of the magnetron can prevent excessive electron emission that would cause the filament temperature to rise and efficiency to decrease. Therefore, by scanning the above parameters, we can find the electric field current, magnetic field current, and magnetic field current corresponding to the highest efficiency point at the current power, until the search for the highest efficiency point is completed for all operating power points, ultimately obtaining the control parameters corresponding to the highest efficiency point within the magnetron's power range.

[0080] Reference Figure 3 , Figure 3 The flowchart illustrates the online closed-loop coordinated control of a magnetron microwave source with coordinated electric field-magnetic field-filament control, as provided in the embodiments of this application.

[0081] like Figure 3 As shown, continuing from above Figure 2 After the output is received, the magnetron microwave source of this embodiment enters the online closed-loop control stage. After the user sets the desired target microwave power, the magnetron microwave source of this embodiment adjusts the microwave output power reference value in a closed loop based on the target power and feedback power. The magnetron microwave source of this embodiment obtains the optimal reference value for the highest efficiency operating point, i.e., the reference electric field current, by using a lookup table method based on the control parameters corresponding to the highest efficiency point obtained offline. Reference magnetic field current and reference filament current These reference values ​​are fed into the closed-loop control loops of the electric field power supply, magnetic field power supply, and filament power supply. Simultaneously, the filament power supply fine-tunes the filament current to maintain it at the minimum value required for stable magnetron power output; the magnetic field power supply stabilizes the magnetic field at the magnetron's highest efficiency point through closed-loop regulation of the magnetic field current; and the electric field power supply adjusts the magnetron's actual output power to the target set value through closed-loop control of the electric field current. In this embodiment, the magnetron microwave source uses the detected electric field current, filament current, magnetic field current, and output power as feedback signals in real time to continuously adjust each driving stage, achieving precise locking and real-time monitoring of the magnetron's operating state.

[0082] Reference Figure 4 , Figure 4 Load characteristic curves of a magnetron microwave source with coordinated electric field-magnetic field-filament control provided in the embodiments of this application.

[0083] like Figure 4 As shown, in the test of the magnetron microwave source with electric field-magnetic field-filament coordinated control disclosed in this embodiment, if the power of the magnetron is increased from 7kW to 18kW, the magnetic field of the conventional magnetron microwave source remains constant during control, i.e., from point A to point B. At this time, the electric field current adjustment is large, and the magnetron efficiency decreases. However, if the magnetron microwave source with electric field-magnetic field-filament coordinated control of this embodiment is used, the power is adjusted by coordinated magnetic field regulation, i.e., from point A to point C, which significantly reduces the electric field current adjustment and improves the magnetron operating efficiency.

[0084] In summary, compared with the prior art, the magnetron microwave source with electric field-magnetic field-filament coordinated control in this embodiment has at least the following technical advantages and effects:

[0085] By optimizing three-dimensional parameters, the efficiency bottleneck caused by the constant magnetic field control of traditional magnetron microwave transmitters is overcome, ensuring that the magnetron can operate at the highest efficiency at all target power points, thus significantly improving energy utilization efficiency.

[0086] The closed-loop collaborative control of the magnetron microwave source in this embodiment can dynamically adjust the filament current to the minimum value required to maintain stable electron emission, reduce filament heating, reduce losses, and improve filament life.

[0087] The electric field-magnetic field-filament coordinated control mechanism enables the magnetic field and filament current to dynamically coordinate with the electric field current adjustment. When the load changes, the amount of electric field current adjustment is reduced, mode jump is suppressed, and the stability and reliability of the magnetron microwave source in this embodiment are enhanced over a wide power range.

[0088] Due to temperature variations or device aging, the performance parameters of a magnetron may drift. A closed-loop co-controlled microwave source can compensate for these variations by finely adjusting the excitation current and filament current in real time through a built-in feedback mechanism, thus maintaining constant output power and efficiency.

[0089] In the embodiments provided in this application, it should be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For hardware implementation, the processor may be implemented in one or more of the following: application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to implement the functions described herein, or combinations thereof. For software implementation, some or all of the processes of the embodiments may be performed by a computer program instructing the associated hardware. During implementation, the program may be stored in a computer-readable storage medium or transmitted as one or more instructions or code on a computer-readable storage medium. Computer-readable storage media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media may be any available medium accessible to a computer. Computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code having the form of instructions or data structures and accessible to a computer.

[0090] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of electric field-magnetic field-filament synergic control magnetron microwave source, characterized in that, This magnetron microwave source performs offline parameter optimization based on a preset magnetron maximum efficiency operating point test method. Based on the results of the offline parameter optimization, the magnetron is driven to output microwaves through online closed-loop collaborative control. The magnetron maximum efficiency operating point test method is based on testing electric field voltage, electric field current, filament voltage, filament current, and microwave power. The online closed-loop collaborative control is based on the control of the electric field power supply, magnetic field power supply, and filament power supply. The parameters required for the offline parameter optimization and the online closed-loop cooperative control are obtained based on the state monitoring of the magnetron, and the parameters at least include electric field voltage , electric field current , filament voltage , filament current , magnetic field current , and microwave power ; The offline parameter optimization and the online closed-loop collaborative control include: By scanning three-dimensional parameters through coordinated control of electric field, magnetic field and filament, the set of points with the highest efficiency within the working range of the magnetron can be obtained. The closed-loop adjustment of the output power setting reference value is based on the target power and the actual power. The reference value of the highest efficiency operating point corresponding to the set power is obtained by looking up a table. The method of obtaining the set of highest efficiency points within the magnetron's operating range through coordinated three-dimensional parameter scanning via electric field, magnetic field, and filament control includes: A1: Defines the range of magnetron output power, electric field current, filament current, and magnetic field current; A2: Select the next target power for the magnetron; A3: operate the electric field power supply in a constant power output mode, adjust the magnetic field current ; A4: Adjust the electric field current This allows the magnetron's output power to reach the set value; A5: Scan filament current to ensure a stable minimum value of the target microwave power output; A6: Electric field voltage , Electric field current , Filament voltage , Filament current , and Microwave power ; A7: Calculate magnetron efficiency ; A8: Determine if this is the point of highest efficiency under the current magnetic field and current. If yes, execute A9; otherwise, execute A4. A9: Determine if this is the highest efficiency point under the current power. If yes, execute A10; otherwise, execute A3. A10: record optimum parameters at current power, optimum parameters include electric field current , magnetic field current , and filament current ; A11: Determine whether all the highest efficiency points within the working range have been obtained. If yes, proceed to the online closed-loop collaborative control; otherwise, execute A2.

2. The method of claim 1, wherein the electric field-magnetic field-filament synergistic control magnetron microwave source is characterized by, Calculating magnetron efficiency in A7 The calculation is based on a preset magnetron efficiency formula, which is: Among them, A8 to A11 find the point of highest efficiency through multi-level nested loop parameter scanning.

3. The method of claim 1, wherein the method further comprises: The reference value for closed-loop adjustment of the output power setting based on the target power and the actual power, further includes the following before it: Based on A11, the control parameters corresponding to the highest efficiency point within the power range of the magnetron are obtained; Set the target power for the magnetron microwave output.

4. The method of claim 3, wherein, The reference value for the highest efficiency operating point includes the reference electric field current. Reference magnetic field current and reference filament current ; Based on the reference value of the highest efficiency operating point and the electric field current in the parameters Magnetic field and current and filament current The coordinated control between them drives the magnetron to output microwaves.

5. The method of claim 4, wherein the method further comprises: According to the reference electric field current With the electric field current The closed-loop regulation of the electric field power source stabilizes the microwave power at the set value.

6. The method for coordinated control of a magnetron microwave source by electric field-magnetic field-filament according to claim 4, characterized in that, According to the reference magnetic field current With the magnetic field current , the closed-loop regulates the magnetic field power supply.

7. The method of claim 4, wherein the method further comprises: According to the reference filament current With the filament current The closed loop regulates the filament power supply to maintain the filament current at the minimum value for stable microwave emission.

8. A magnetic field-microwave source with electric field-magnetic field-filament synergic control, characterized by that, The magnetron microwave source is controlled by the method of electric field-magnetic field-filament coordinated control of the magnetron microwave source as described in any one of claims 1 to 7.

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