Control circuit and microwave generator
The control circuit in microwave generators addresses filament overheating by individually controlling the filament circuit through a switch section and transformer assembly, ensuring continuous electron emission and extended magnetron lifespan.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-07-12
- Publication Date
- 2026-03-25
AI Technical Summary
Existing microwave generators suffer from filament overheating due to continuous energization, leading to reduced efficiency and shortened lifespan, as the filament voltage remains constant and cannot be individually controlled.
A control circuit with a switch section and transformer assembly is introduced, allowing independent control of the filament circuit through a control element that interrupts or conducts the circuit based on current changes, including temperature feedback mechanisms to prevent overheating.
The solution ensures continuous electron emission and operation of the magnetron by individually controlling the filament circuit, thereby maintaining operational quality and extending the lifespan of the magnetron.
Smart Images
Figure 2026509760000001_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of microwave technology, and particularly to a control circuit and a microwave generator.
Background Art
[0002] Electrons in the cathode of a magnetron interact between a vertical steady magnetic field and an electric field, converting electrical energy into electromagnetic energy. A transformer is used to convert electrical energy into the required power forms for the cathode filament and anode of the magnetron. The output of the secondary winding of the transformer usually consists of two parts. One part is a high voltage of about 4KV between the magnetron anode and ground, generating an electric field inside the magnetron. The other part is a voltage of about 3.3V between the cathodes (filaments), enabling continuous electron emission after energization heating by an inverter.
[0003] In related technologies, no matter what kind of transformer is adopted, it belongs to passive components, and the anode voltage and filament voltage output by its secondary side to the magnetron are determined by the voltage on the primary side and the coil turns ratio. After the magnetron starts oscillating, the filament voltage is always maintained around 3.3V, or the filament voltage also decreases as the output power decreases. When operating continuously without reducing the output for a long time, the filament will overheat due to continuous energization, promoting the evaporation of materials, causing quality deterioration and shortening of the filament life. Also, continuous energization consumes power and reduces the operating efficiency of the magnetron.
Summary of the Invention
Problems to be Solved by the Invention
[0004] Embodiments of this application provide a control circuit and a microwave generator.
Means for Solving the Problems
[0005] The control circuit according to the embodiment of the present application is applied to a microwave generator, the microwave generator includes a magnetron, and the control circuit includes a transformer assembly and a switch section. The transformer assembly includes a primary winding, a primary winding, and a secondary winding, wherein the primary winding is located on the primary side of the transformer assembly, the primary winding and the secondary winding are located on the secondary side of the transformer assembly, and the primary winding and the cathode of the magnetron form a filament circuit. The switch section includes a switch element and a control element, the switch element being arranged in the filament circuit, the control element being electrically connected to a control winding, the control element being configured to control the switch element to interrupt or conduct the filament circuit when a current change occurs in the control winding, the control winding being one of the windings of the transformer assembly, and the control winding and the anode of the magnetron forming an anode circuit.
[0006] The above control circuit, by installing a switch, allows the control element to control the switch element and interrupt the filament circuit. This allows the power to be turned off after the cathode of the magnetotube has generated sufficient electrons due to the current flow. The magnetotube can continue to generate electrons due to the electron reverse blast characteristic, and furthermore, the magnetotube can continue to operate. This is advantageous in achieving the effect of individually conducting / disconnecting the cathode of the magnetotube, and can guarantee the operating quality and service life of the magnetotube.
[0007] In some embodiments, the control winding includes the secondary winding, When current begins to flow through the secondary winding and a change in current occurs, the control element controls the switch element to interrupt the filament circuit. When the current to the secondary winding is stopped and a change in current occurs, the control element controls the switch element to make the filament circuit conductive.
[0008] In this way, it becomes possible to individually control the conduction / disconnection of the filament circuit through the switching element.
[0009] In some embodiments, when the temperature of the cathode of the magnetotube is above a first predetermined temperature, current begins to flow in the secondary winding. If the temperature of the cathode of the magnetotube is below a second predetermined temperature, the current to the second secondary winding is stopped. The second predetermined temperature is less than or equal to the first predetermined temperature.
[0010] In this way, it is possible to achieve self-feedback adjustment of the cathode temperature of the magnetometer.
[0011] In some embodiments, the control winding includes an auxiliary winding, the auxiliary winding being located on the primary side of the transformer assembly. When current is supplied to the primary winding, current flows synchronously into the auxiliary winding, causing a change in current. When current begins to flow through the auxiliary winding and a change in current occurs, the control element controls the switch element within a predetermined time to open the filament circuit, and after the predetermined time has elapsed, controls the switch element to shut off the filament circuit.
[0012] In this way, we avoid overheating caused by prolonged energization of the filament circuit, which could affect the lifespan of the magnetometer.
[0013] In some embodiments, the control circuit is The system includes a rectifier module that is electrically connected to the secondary winding and the anode of the magnetotube and configured to supply a DC voltage to the magnetotube.
[0014] In this way, the AC voltage formed in the secondary winding can be converted into a DC voltage.
[0015] The microwave generator according to the embodiment of the present application is Including magnetometers and control circuits, The control circuit includes a transformer assembly and a switch section. The transformer assembly includes a primary winding, a primary winding, and a secondary winding, wherein the primary winding is located on the primary side of the transformer assembly, the primary winding and the secondary winding are located on the secondary side of the transformer assembly, and the primary winding and the cathode of the magnetron constitute a filament circuit. The switch section includes a switch element and a control element, wherein the switch element is arranged in the filament circuit, the control element is electrically connected to a control winding, the control element is configured to control the switch element to interrupt or conduct the filament circuit when a current change occurs in the control winding, the control winding is one of the windings of the transformer assembly, and the control winding and the anode of the magnetron constitute an anode circuit.
[0016] The above microwave generator, by installing a switch unit, allows the control element to control the switch element and interrupt the filament circuit. This allows the power to be turned off after the cathode of the magnetometer has generated sufficient electrons through current flow. The magnetometer can continue to generate electrons due to its electron reverse blast characteristics, and furthermore, the magnetometer can continue to operate. This is advantageous in achieving the effect of individually conducting / disconnecting the cathode of the magnetometer, and can guarantee the operating quality and service life of the magnetometer.
[0017] In some embodiments, the control winding includes the secondary winding, When current begins to flow through the secondary winding and a change in current occurs, the control element controls the switch element to interrupt the filament circuit. When the current to the secondary winding is stopped and a change in current occurs, the control element controls the switch element to make the filament circuit conductive.
[0018] In this way, it becomes possible to individually control the conduction / disconnection of the filament circuit through the switching element.
[0019] In some embodiments, when the temperature of the cathode of the magnetron is equal to or higher than a first predetermined temperature, a current starts to flow through the second secondary winding. When the temperature of the cathode of the magnetron is equal to or lower than a second predetermined temperature, the power supply to the second secondary winding is stopped. The second predetermined temperature is equal to or lower than the first predetermined temperature.
[0020] In this way, self-feedback adjustment of the temperature of the cathode of the magnetron can be realized.
[0021] In some embodiments, the control winding includes an auxiliary winding, and the auxiliary winding is arranged on the primary side of the transformer assembly. When the primary winding is energized, a current flows into the auxiliary winding synchronously, resulting in a current change. When a current starts to flow through the auxiliary winding and a current change occurs, the control element controls the switch element to conduct the filament circuit within a predetermined time, and after the predetermined time elapses, controls the switch element to cut off the filament circuit.
[0022] In this way, it is possible to avoid affecting the service life of the magnetron due to overheating caused by long-term energization of the filament circuit.
[0023] In some embodiments, the control circuit includes a rectification module that is electrically connected to the second secondary winding and the anode of the magnetron and is configured to supply a DC voltage to the magnetron.
[0024] In this way, the AC voltage formed by the second secondary winding can be converted into a DC voltage. <00001The foregoing and / or additional aspects and advantages of this application will become clearer and easier to understand in relation to the following drawings relating to the description of the embodiments. [Figure 1] This is a schematic diagram of the circuit connection of a microwave generator according to an embodiment of the present invention. [Figure 2] This is a schematic diagram illustrating the operation of the control circuit of the embodiment of the present invention. [Figure 3] This is a schematic diagram of another circuit connection for the microwave generator according to the embodiment of the present invention. [Modes for carrying out the invention]
[0027] The embodiments of the present application shown in the drawings will be described in detail below. In all drawings, the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below through the reference drawings are illustrative and for illustrative purposes only, and should not be understood as limitations to the present application.
[0028] In the description of this application, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating the number of technical features that are expressed or implied to be of relative importance. Therefore, features limited by “first” and “second” may explicitly or implicitly include at least one such feature. In the description of this application, “plural” means two or more unless otherwise specified.
[0029] In this application, terms such as “attachment,” “connection,” and “connection” should be understood broadly unless otherwise specified and limited, and for example, they may be fixedly connected, detachably connected, integrated, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internal communication or interaction relationship between two elements. Unless otherwise explicitly limited, the specific meaning of the above terms in this application can be understood by a person skilled in the art depending on the context.
[0030] The disclosure of this application provides many different embodiments or examples for realizing different structures of the application. For the sake of simplification of the disclosure, the parts and configurations in specific examples are described below. Of course, these are merely illustrative and not limiting to the application. Furthermore, the application may use the same reference numbers and / or reference letters in different examples, but this duplication is for simplification and clarity and does not in itself indicate relationships between the various embodiments and / or configurations discussed. Also, while the application provides examples of various specific processes and materials, those skilled in the art will recognize that other processes and / or other materials can be applied.
[0031] Please refer to Figures 1 and 3. The control circuit 100 of this embodiment is used in a microwave generator 200. The microwave generator 200 includes a magnetron 36. The control circuit 100 includes a transformer assembly 12 and a switch unit 20. The transformer assembly 12 includes a primary winding 14, a primary secondary winding 16, and a secondary winding 18. The primary winding 14 is located on the primary side of the transformer assembly 12, and the primary secondary winding 16 and secondary winding 18 are located on the secondary side of the transformer assembly 12. The primary secondary winding 16 and the cathode 37 of the magnetron 36 constitute a filament circuit 26. The switch unit 20 includes a switch element 22 and a control element 24. The switch element 22 is located within the filament circuit 26, and the control element 24 is electrically connected to a control winding 19. The control element 24 controls the switch element 22 to interrupt or conduct the filament circuit 26 when a current change occurs in the control winding 19. The control winding 19 is one of the windings of the transformer assembly 12, and the control winding 19 and the anode 38 of the magnetotube 36 constitute the anode circuit 27.
[0032] The control circuit 100, by installing the switch unit 20, allows the control element 24 to control the switch element 22 to interrupt the filament circuit 26. This enables the power to be turned off after the cathode 37 of the magnetometer 36 has generated sufficient electrons through current flow. Due to the electron reverse blast characteristics, the cathode 37 of the magnetometer 36 continues to generate electrons, allowing the magnetometer 36 to continue operating. This is advantageous in achieving the effect of individually conducting / interrupting the cathode 37 of the magnetometer 36, and can guarantee the operational quality and service life of the magnetometer 36.
[0033] Specifically, the transformer assembly 12 has a primary side and a secondary side. The primary winding 14 is provided on the primary side, and the first secondary winding 16 and the second secondary winding 18 are provided on the secondary side of the transformer assembly 12. A magnetron 36 can be electrically connected to the control circuit 100, and the magnetron 36 may have a cathode 37 and an anode 38, the cathode 37 may be the filament of the magnetron 36. The first secondary winding 16 and the cathode 37 can constitute a filament circuit 26. In one embodiment, the control circuit 100 further includes a power supply 13, which may include an AC power supply, and the power supply 13 is electrically connected to the primary winding 14 to form a circuit that can cause a current change in the primary winding 14. In one embodiment, an inverter circuit is electrically connected to the primary winding 14 to form a circuit that can supply power to the primary winding 14. The switch unit 20 includes a current relay, and the switch unit 20 is provided with a switch element 22 and a control element 24. The switch element 22 may be provided within the filament circuit 26 and has a first end 28 and a second end 30. The first end 28 is movablely connected to the filament circuit 26, and the second end 30 can interrupt or conduct the filament circuit 26, thereby achieving an independent conduction / interruption control effect on the filament circuit 26. The control element 24 can be electrically connected to the control winding 19, which may be one of the windings of the transformer assembly 12. In one embodiment, the secondary winding 18 and the anode 38 of the magnetron 36 can constitute an anode circuit 27. After energizing the microwave generator 200, the magnetron 36 can be preheated. After preheating of the magnetron 36 is complete, current can be generated in the anode circuit 27. When a current change occurs in the control winding 19, the control element 24 can control the switch element 22 to interrupt or conduct the filament circuit 26.When the control element 24 controls the switch element 22 to interrupt the filament circuit 26, the cathode 37 can generate sufficient electrons through current flow before the power is cut off. The magnetotube 36 can continue to generate electrons due to the electron reverse blast characteristics, and furthermore, the magnetotube 36 can continue to operate, thereby achieving independent conduction / interruption control for the filament circuit 26.
[0034] Refer to Figure 1 in some embodiments. The control winding 19 includes a secondary winding 18. When current begins to flow through the secondary winding 18 and a change in current occurs, the control element 24 controls the switch element 22 to interrupt the filament circuit 26. When the current to the secondary winding 18 is stopped and a change in current occurs, the control element 24 controls the switch element 22 to allow the filament circuit 26 to conduct.
[0035] In this way, the switch element 22 can provide independent conduction / disconnection control for the filament circuit 26.
[0036] Specifically, in one embodiment, when current begins to flow through the secondary winding 18 and a change in current occurs, the control element 24 can control the switch element 22 to interrupt the filament circuit 26. When the switch element 22 interrupts the filament circuit 26, the cathode 37 has already generated sufficient electrons when conducting and energizing, and the magnetotube 36 can continue to generate electrons due to the electron reverse blasting characteristic, and furthermore, the magnetotube 36 can continue to operate. In one embodiment, when the energization to the secondary winding 18 is stopped and a change in current occurs, the control element 24 can control the switch element 22 to conduct the filament circuit 26, and the magnetotube 36 can continue to operate. The anode 38 of the magnetotube 36 can be electrically connected to the secondary winding 18 to form a circuit. By interrupting or conducting the filament circuit 26, the switch element 22 can perform independent conduction / interruption control of the filament circuit 26. In one example, the microwave generator 200 may have a preheating stage when power is first applied. During the preheating stage, the temperature of the cathode 37 of the magnetometer 36 can be raised to a predetermined value, thereby enabling the emission of electrons. During the preheating stage, a voltage is applied across both the cathode 37 and the anode 38, but no current is yet flowing through the circuit formed by the electrical connection between the anode 38 and the secondary winding 18. After the preheating stage ends, current begins to flow through the secondary winding 18, causing a change in current, and the control element 24 can control the switch element 22 to interrupt the filament circuit 26. This allows the magnetometer 36 to continue generating electrons due to the electron inverse blast characteristics, and furthermore, allows the magnetometer 36 to continue operating.
[0037] In some embodiments, current begins to flow through the secondary winding 18 when the temperature of the cathode 37 of the magnetron 36 is above a first predetermined temperature. When the temperature of the cathode 37 of the magnetron 36 is below a second predetermined temperature, the current to the secondary winding 18 is stopped. The second predetermined temperature is below the first predetermined temperature.
[0038] In this way, it is possible to achieve self-feedback adjustment of the temperature of the cathode 37 of the magnetometer 36.
[0039] Specifically, in one embodiment, current begins to flow through the secondary winding 18 when the temperature of the cathode 37 of the magnetron 36 is greater than a first predetermined temperature. In one embodiment, current begins to flow through the secondary winding 18 when the temperature of the cathode 37 of the magnetron 36 is equal to the first predetermined temperature. In one embodiment, the current to the secondary winding 18 is stopped when the temperature of the cathode 37 of the magnetron 36 is less than a second predetermined temperature. In one embodiment, the current to the secondary winding 18 is stopped when the temperature of the cathode 37 of the magnetron 36 is equal to the second predetermined temperature. In one embodiment, the range of the first predetermined temperature is 10K℃ to 200K℃.
[0040] Refer to Figure 2. In one example, if the temperature of the cathode 37 is too low to emit electrons, the magnetotube 36 stops operating, and no current flows through the circuit formed by the anode 38 and the secondary winding 18 of the magnetotube 36. When no current flows through the secondary winding 18, the control element 24 controls the switch element 22 to conduct electricity through the filament circuit 26, allowing the filament circuit 26 to continue heating the cathode 37. Once heated to a predetermined temperature, the cathode 37 becomes capable of emitting electrons, and the magnetotube 36 can continue operating. When the magnetotube 36 continues operating, current flows through the circuit formed by the anode 38 and the secondary winding 18, and the control element 24 controls the switch element 22 to shut off the filament circuit 26, stopping the heating of the cathode 37. This enables self-feedback adjustment of the temperature of the cathode 37 of the magnetotube 36.
[0041] Refer to Figure 3. In some embodiments, the control winding 19 includes an auxiliary winding 34, which is located on the primary side of the transformer assembly 12. When the primary winding 14 is energized, current flows synchronously into the auxiliary winding 34, causing a current change. When current begins to flow into the auxiliary winding 34 and a current change occurs, the control element 24 controls the switch element 22 within a predetermined time to conduct the filament circuit 26, and after the predetermined time has elapsed, controls the switch element 22 to shut off the filament circuit 26.
[0042] In this way, it is possible to avoid overheating due to prolonged energization of the filament circuit 26, which could affect the service life of the magnetometer 36.
[0043] Specifically, the auxiliary winding 34 may be installed on the primary side of the transformer assembly 12 and arranged on the same side as the primary winding 14. The auxiliary winding 34 and the primary winding 14 may be electrically connected to the same power supply 13, and when the primary winding 14 is energized, current flows synchronously into the auxiliary winding 34, causing a current change. The control element 24 is electrically connected to the auxiliary winding 34 and can form a circuit with the auxiliary winding 34. The control element 24 may be set to a predetermined time, and when current starts to flow into the auxiliary winding 34 and a current change occurs, the control element 24 can control the switch element 22 within the predetermined time to conduct the filament circuit 26, at which point the second terminal 30 is connected to the filament circuit 26. After the predetermined time has been reached, the control element 24 can control the switch element 22 to shut off the filament circuit 26, at which point the connection between the second terminal 30 and the filament circuit 26 is broken. In one example, at the start of the energizing operation, the primary voltage can be converted to the secondary voltage, and further, the voltage necessary for the operation of the magnetometer 36 can be supplied. Next, the cathode 37 and anode 38 are energized through the circuit in which the filament circuit 26 and the secondary winding 18 are located. After the preheating stage of the cathode 37 is completed, the control element 24 can control the switch element 22 based on a set predetermined time to shut off the filament circuit 26. In one embodiment, the predetermined time can be 8 seconds.
[0044] Refer to Figure 1. In some embodiments, the control circuit 100 includes a rectifier module 32. The rectifier module 32 is electrically connected to the secondary winding 18 and the anode 38 of the magnetotube 36 and is configured to supply a DC voltage to the magnetotube 36.
[0045] In this way, the AC voltage formed by the secondary winding 18 can be converted to a DC voltage.
[0046] Specifically, in one embodiment, the rectifier module 32 can form a circuit with the secondary winding 18, and the anode 38 of the magnetron 36 can form a circuit with the rectifier module 32. The rectifier module 32 is electrically connected to the secondary winding 18 and the anode 38 of the magnetron 36, and is further configured to supply a DC voltage to the magnetron 36 by converting the AC voltage formed by the secondary winding 18 into a DC voltage.
[0047] Please refer to Figure 1. The microwave generator 200 according to the embodiment of the present application includes a magnetometer 36, a control circuit 100, and a transformer assembly 12. The control circuit 100 includes the transformer assembly 12 and a switch unit 20. The transformer assembly 12 includes a primary winding 14, a primary secondary winding 16, and a secondary winding 18. The primary winding 14 is located on the primary side of the transformer assembly 12, and the primary secondary winding 16 and secondary winding 18 are located on the secondary side of the transformer assembly 12. The primary secondary winding 16 and the cathode 37 of the magnetometer 36 constitute a filament circuit 26. The switch unit 20 includes a switch element 22 and a control element 24, the switch element 22 being located within the filament circuit 26. A control element 24 is electrically connected to the control winding 19, and the control element 24 is configured to control a switch element 22 to interrupt or conduct the filament circuit 26 when a current change occurs in the control winding 19. The control winding 19 is one of the windings of the transformer assembly 12, and the control winding 19 and the anode 38 of the magnetron 36 constitute an anode circuit 27.
[0048] The microwave generator 200, by installing a switch unit 20, allows the control element 24 to control the switch element 22 to interrupt the filament circuit 26. This enables the power to be turned off after the cathode 37 of the magnetometer 36 has generated sufficient electrons through current flow. The magnetometer 36 can continue to generate electrons due to its electron reverse blast characteristics, and furthermore, the magnetometer 36 can continue to operate. This is advantageous in achieving the effect of individually conducting / interrupting the cathode 37 of the magnetometer 36, and can guarantee the operational quality and service life of the magnetometer 36.
[0049] Specifically, the magnetotube 36 can be electrically connected to the control circuit 100, and the magnetotube 36 can have a cathode 37 and an anode 38, the cathode 37 may be the filament of the magnetotube 36. A detailed explanation of the operating principle of the control circuit 100 in this embodiment has already been described above, and you can refer to the above explanation of the operating principle of the control circuit 100.
[0050] Refer to Figure 1. In some embodiments, the control winding 19 includes a secondary winding 18. When current begins to flow through the secondary winding 18 and a change in current occurs, the control element 24 controls the switch element 22 to interrupt the filament circuit 26. When the current to the secondary winding 18 is stopped and a change in current occurs, the control element 24 controls the switch element 22 to allow the filament circuit 26 to conduct.
[0051] In this way, the switch element 22 can provide independent conduction / disconnection control for the filament circuit 26.
[0052] Specifically, a detailed description of this embodiment has already been given above, so please refer to the detailed description of this embodiment above. After energizing the microwave generator 200, the magnetotube 36 can be preheated by starting to oscillate. After oscillating for a certain period of time, current flows through the secondary winding 18, causing a change in current, and the control element 24 can control the switch element 22 to interrupt the filament circuit 26. The magnetotube 36 maintains a high temperature state of the cathode 37 due to its electron inverse blast characteristics, allowing electron emission to continue, and furthermore, the magnetotube 36 can continue to operate normally.
[0053] In some embodiments, current begins to flow through the secondary winding 18 when the temperature of the cathode 37 of the magnetron 36 is above a first predetermined temperature. When the temperature of the cathode 37 of the magnetron 36 is below a second predetermined temperature, the current to the secondary winding 18 is stopped. The second predetermined temperature is below the first predetermined temperature.
[0054] In this way, it is possible to achieve self-feedback adjustment of the temperature of the cathode 37 of the magnetometer 36.
[0055] Specifically, a detailed description of this embodiment has already been given above; please refer to the detailed description of this embodiment described above.
[0056] Refer to Figure 3. In some embodiments, the control winding 19 includes an auxiliary winding 34, which is located on the primary side of the transformer assembly 12. When the primary winding 14 is energized, current flows synchronously into the auxiliary winding 34, causing a current change. When current begins to flow into the auxiliary winding 34 and a current change occurs, the control element 24 controls the switch element 22 within a predetermined time to conduct the filament circuit 26, and after the predetermined time has elapsed, controls the switch element 22 to shut off the filament circuit 26.
[0057] In this way, it is possible to avoid overheating due to prolonged energization of the filament circuit 26, which could affect the service life of the magnetometer 36.
[0058] Specifically, a detailed description of this embodiment has already been given above; please refer to the detailed description of this embodiment described above.
[0059] Refer to Figure 1. In some embodiments, the control circuit 100 includes a rectifier module 32. The rectifier module 32 is electrically connected to the secondary winding 18 and the anode 38 of the magnetotube 36 and is configured to supply a DC voltage to the magnetotube 36.
[0060] In this way, the AC voltage formed by the secondary winding 18 can be converted to a DC voltage.
[0061] Specifically, a detailed description of this embodiment has already been given above; please refer to the detailed description of this embodiment described above.
[0062] In this specification, reference terms such as “one embodiment,” “several embodiments,” “some embodiments,” “schematic embodiment,” “example,” “specific example,” or “several examples” refer to specific features, structures, materials, or characteristics described in combination with such embodiments or examples, which are included in at least one embodiment or example of the present application. In this specification, exemplary descriptions of the above terms do not necessarily apply to the same embodiment or example. Furthermore, specific features, structures, materials, or characteristics described can be combined in an appropriate manner in any or more embodiments or examples.
[0063] Although embodiments of this application have been described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application. The scope of this application is limited by the claims and their equivalents. Cross-reference to related applications
[0064] This application claims priority to the Chinese patent application filed on 23 February 2023, application number 202310161336.5, the entire contents of which are incorporated herein by reference. [Explanation of Symbols]
[0065] 100, control circuit, 12, transformer assembly, 13, power supply, 14, primary winding, 16, primary secondary winding, 18, secondary secondary winding, 19, control winding, 20, switch section, 22, switch element, 24, control element, 26, filament circuit, 27, anode circuit, 28, first terminal, 30, second terminal, 32, rectifier module, 34, auxiliary winding, 200, microwave generator, 36, magnetometer, 37, cathode, 38, anode.
Claims
1. A control circuit applied to a microwave generator equipped with a magnetotube, wherein the control circuit comprises a transformer assembly and a switch section, The transformer assembly comprises a primary winding, a primary winding, and a secondary winding, wherein the primary winding is located on the primary side of the transformer assembly, the primary winding and the secondary winding are located on the secondary side of the transformer assembly, and the primary winding and the cathode of the magnetron constitute a filament circuit. The control circuit is characterized in that the switch section includes a switch element and a control element, the switch element is arranged in the filament circuit, the control element is electrically connected to a control winding, the control element is configured to control the switch element to interrupt or conduct the filament circuit when a current change occurs in the control winding, the control winding is one of the windings of the transformer assembly, and the control winding and the anode of the magnetron constitute an anode circuit.
2. The control winding includes the secondary winding, When current begins to flow through the secondary winding and a change in current occurs, the control element controls the switch element to interrupt the filament circuit. The control circuit according to claim 1, characterized in that when the current to the secondary winding is stopped and a change in current occurs, the control element controls the switch element to make the filament circuit conductive.
3. When the temperature of the cathode of the magnetotube is above a first predetermined temperature, current begins to flow in the second secondary winding. If the temperature of the cathode of the magnetotube is below a second predetermined temperature, the current to the second secondary winding is stopped. The control circuit according to claim 1 or 2, characterized in that the second predetermined temperature is less than or equal to the first predetermined temperature.
4. The control winding includes an auxiliary winding, the auxiliary winding being located on the primary side of the transformer assembly. When current is supplied to the primary winding, current flows synchronously into the auxiliary winding, causing a change in current. The control circuit according to any one of claims 1 to 3, characterized in that when current begins to flow in the auxiliary winding and a change in current occurs, the control element controls the switch element within a predetermined time to open the filament circuit, and after the predetermined time has elapsed, controls the switch element to shut off the filament circuit.
5. The aforementioned control circuit is The control circuit according to any one of claims 1 to 4, characterized in that it includes a rectifier module that is electrically connected to the secondary winding and the anode of the magnetotube and configured to supply a DC voltage to the magnetotube.
6. A microwave generator, Including magnetometers and control circuits, The control circuit includes a transformer assembly and a switch section. The transformer assembly includes a primary winding, a primary winding, and a secondary winding, wherein the primary winding is located on the primary side of the transformer assembly, the primary winding and the secondary winding are located on the secondary side of the transformer assembly, and the primary winding and the cathode of the magnetron form a filament circuit. The microwave generator is characterized in that the switch section includes a switch element and a control element, the switch element is arranged in the filament circuit, the control element is electrically connected to a control winding, the control element is configured to control the switch element to interrupt or conduct the filament circuit when a current change occurs in the control winding, the control winding is one of the windings of the transformer assembly, and the control winding and the anode of the magnetron constitute an anode circuit.
7. The control winding includes the secondary winding, When current begins to flow through the secondary winding and a change in current occurs, the control element controls the switch element to interrupt the filament circuit. The microwave generator according to claim 6, characterized in that when the current to the secondary winding is stopped and a change in current occurs, the control element controls the switch element to make the filament circuit conductive.
8. When the temperature of the cathode of the magnetotube is above a first predetermined temperature, current begins to flow in the second secondary winding. If the temperature of the cathode of the magnetotube is below a second predetermined temperature, the current to the second secondary winding is stopped. The microwave generator according to claim 6 or 7, characterized in that the second predetermined temperature is less than or equal to the first predetermined temperature.
9. The control winding includes an auxiliary winding, the auxiliary winding being located on the primary side of the transformer assembly. When current is supplied to the primary winding, current flows synchronously into the auxiliary winding, causing a change in current. The microwave generator according to any one of claims 6 to 8, characterized in that when current begins to flow in the auxiliary winding and a change in current occurs, the control element controls the switch element within a predetermined time to open the filament circuit, and after the predetermined time has elapsed, controls the switch element to shut off the filament circuit.
10. The aforementioned control circuit is The microwave generator according to any one of claims 6 to 9, characterized in that it includes a rectifier module that is electrically connected to the secondary winding and the anode of the magnetotube and configured to supply a DC voltage to the magnetotube.