High-power microwave solid-state source module

Abstract

The utility model discloses a high-power microwave solid-state source module, which comprises an adjustable signal source, an analog electrically controlled attenuation control circuit, a radio frequency switch, a gain power amplifier module, a power divider, a multi-stage power amplifier circuit, a combiner, a power detection circuit and a main control circuit, the input end of the adjustable signal source is connected with an input power supply, and the output end of the adjustable signal source is sequentially connected with the analog electrically-controlled attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multi-stage power amplifier circuit and the combiner; the power detection circuit is in coupling connection with the output end of the combiner; the main control circuit is connected with the control end of the adjustable signal source, the control end of the analog electrically controlled attenuation control circuit, the control end of the radio frequency switch, the control end of the gain power amplifier module, the control end of the multi-stage power amplifier circuit and the output end of the power detection circuit. According to the utility model, the problems of low efficiency and inconvenient and unstable frequency and power adjustment of the existing microwave solid-state source are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of radio frequency microwave technology, specifically relates to a kind of high-power microwave solid-state source module. BACKGROUND

[0002] In today's radio frequency microwave field, microwave solid-state source occupies the vital position, is one of indispensable core components. With the exponential development of modern science and technology, microwave solid-state source is gradually replaced by magnetron, traveling wave tube and backward wave tube and other traditional electric vacuum devices by its unique advantages. This revolutionary substitution process not only embodies the iteration and upgrading of technology, but also enables microwave solid-state source to be widely and deeply integrated into industry, medical treatment and household appliances and other fields.

[0003] In the industrial field, microwave solid-state source provides stable energy source for processes such as microwave heating, microwave drying, etc., and effectively promotes the efficient production and technological innovation of related industries; In the medical field, it is applied to microwave treatment equipment, which opens up a new way for the diagnosis and treatment of diseases and improves the quality and effect of medical services; In the field of household appliances, the application of microwave solid-state source optimizes the performance of microwave ovens, wireless routers and other products, greatly facilitating people's daily life.

[0004] However, the existing microwave solid-state source on the market still has many problems to be solved. In terms of efficiency, the energy conversion efficiency of the existing microwave solid-state source is low, and there is a lot of energy loss in the process of converting input electric energy into microwave energy, which not only causes energy waste and increases use cost, but also converts excessive energy loss into heat, which requires additional heat dissipation device to ensure the normal operation of the equipment, further increasing the complexity and cost of the equipment.

[0005] In terms of frequency and power adjustment, the adjustment process is complicated, and often requires professional technicians to use complex equipment and tools to complete, which is not friendly to ordinary users and limits the popularization and promotion of the product. In addition, the stability of adjustment is poor, and when adjusting frequency and power, it is easily affected by external environmental factors (such as temperature, humidity, electromagnetic interference, etc.), resulting in fluctuations in output frequency and power, which cannot meet the application scenarios with high precision requirements.

[0006] In addition, the existing microwave solid-state source has large radiation to the outside world, which not only interferes with the normal operation of surrounding electronic equipment, but also may pose a potential threat to human health in the long run. UTILITY MODEL CONTENT

[0007] In order to overcome the prior art microwave solid-state source exists low efficiency, frequency and power adjustment is inconvenient and unstable, the external radiation and other problems, the utility model provides a high -power microwave solid -state source module.

[0008] The utility model technical scheme is as follows:

[0009] A high -power microwave solid -state source module, including adjustable signal source, analog electric regulation attenuation control circuit, radio frequency switch, gain power amplifier module, power divider, multistage power amplifier circuit, combiner, power detection circuit and main control circuit;

[0010] The input end of adjustable signal source is connected to input power supply, and the output end of adjustable signal source is connected in proper order analog electric regulation attenuation control circuit, radio frequency switch, gain power amplifier module, power divider, multistage power amplifier circuit and combiner;

[0011] The power detection circuit is coupled with the output end of combiner;

[0012] The main control circuit is connected with the control end of adjustable signal source, the control end of analog electric regulation attenuation control circuit, the control end of radio frequency switch, the control end of gain power amplifier module, the control end of multistage power amplifier circuit and the output end of power detection circuit respectively.

[0013] As a preferred scheme of the utility model, it further includes a water-cooled base and a shielding cover arranged on the top of the water-cooled base, and the adjustable signal source, the analog electric regulation attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multistage power amplifier circuit, the combiner, the power detection circuit and the main control circuit are arranged in the space enclosed by the water-cooled base and the shielding cover.

[0014] As a preferred scheme of the utility model, the adjustable signal source is a broadband frequency synthesizer integrated with VCO.

[0015] As a preferred scheme of the utility model, the analog electric regulation attenuation control circuit includes symmetrical π-type attenuation networks, and the π-type attenuation networks are composed of PIN diodes and voltage dividing resistors.

[0016] As a preferred scheme of the utility model, the radio frequency switch is a high-speed radio frequency switch.

[0017] As a preferred scheme of the utility model, the gain power amplifier module is a pre-push and push amplifier.

[0018] As a preferred scheme of the utility model, the power divider is a Wilkinson power divider.

[0019] As a preferred scheme of the utility model, the multistage power amplifier circuit includes a plurality of parallel final stage power amplifiers, the input ends of the plurality of final stage power amplifiers are connected with the corresponding output branches of the power divider respectively, the control ends of the plurality of final stage power amplifiers are connected with the main control circuit, and the output ends of the plurality of final stage power amplifiers are connected with the input end of the combiner through the isolator.

[0020] As a preferred scheme of the utility model, the combiner is a suspension band power combiner.

[0021] As a preferred scheme of the utility model, the main control circuit is connected with the external computer through a single-chip microcomputer or a serial port.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] 1. Through the cooperation between the adjustable signal source, the analog electrically-controlled attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multistage power amplifier circuit, the combiner, the power detection circuit and the main control circuit, the problems of low efficiency, inconvenient and unstable frequency and power adjustment and large external radiation of the existing microwave solid-state source are effectively overcome, and the comprehensive performance of the microwave solid-state source is improved.

[0024] 2. Through the reasonable connection and cooperative work of each circuit module, the integration of signal generation, power adjustment, amplification, detection and control functions is realized, so that the module structure is compact, and the installation and use are convenient.

[0025] 3. The water-cooled base and the shielding cover are arranged, so that the heat dissipation and radiation problems are effectively solved, on the one hand, the heat is taken away through the cooling water circulation to ensure the normal operation of the equipment, and on the other hand, the shielding cover reduces the influence of radiation on the surrounding equipment and human body. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 It is the front view of the utility model;

[0028] Figure 2 It is the side view of the utility model;

[0029] Figure 3 It is the structural schematic view of the top aluminum plate in the utility model.

[0030] In the drawings,

[0031] 1 adjustable signal source; 2 analog electrically adjustable attenuation control circuit; 3 RF switch; 4 gain power amplifier module; 5 power divider; 6 multi-stage power amplifier circuit; 7 combiner; 8 power detection circuit; 9 main control circuit; 10 water-cooled base; 11 shielding cover; 12 temperature and current detection circuit; 13 isolator. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the following will be further described in detail in combination with the drawings and examples. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, it is declared that the following described examples are only for explaining the present application, and are not used to limit the present application.

[0033] It should be noted that the terms "mounting", "setting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly used when the product of the application is used, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] Please refer to Figure 1 , Figure 2The embodiment provides a high-power microwave solid-state source module, which comprises an adjustable signal source 1, an analog electrically adjustable attenuation control circuit 2, a radio frequency switch 3, a gain power amplifier module 4, a power divider 5, a multi-stage power amplification circuit 6, a combiner 7, a power detection circuit 8 and a main control circuit 9. The input end of the adjustable signal source 1 is connected with an input power supply. The output end of the adjustable signal source 1 is connected with the analog electrically adjustable attenuation control circuit 2, the radio frequency switch 3, the gain power amplifier module 4, the power divider 5, the multi-stage power amplification circuit 6 and the combiner 7 in sequence. The power detection circuit 8 is coupled with the output end of the combiner 7. The main control circuit 9 is connected with the control end of the adjustable signal source 1, the control end of the analog electrically adjustable attenuation control circuit 2, the control end of the radio frequency switch 3, the control end of the gain power amplifier module 4, the control end of the multi-stage power amplification circuit 6 and the output end of the power detection circuit 8.

[0035] The adjustable signal source 1 is used for generating signals, and can provide an adjustable signal source for the whole module. The main control circuit 9 can generate signals with different frequencies and characteristics. The analog electrically adjustable attenuation control circuit 2 is used for adjusting output power, and can adjust signal power according to the instruction of the main control circuit 9, so that the module can output microwave signals with different powers, and meet the power requirements of different application scenarios. The radio frequency switch 3 is used for controlling the on-off of radio frequency signals, and can quickly open or close the transmission of radio frequency signals according to the instruction of the main control circuit 9, so as to realize accurate control of microwave signal output. The gain power amplifier module 4 is used for pre-stage gain and amplification of signals, improves the strength of the signals, provides suitable input signals for the subsequent multi-stage power amplification circuit 6, and improves the signal amplification efficiency and performance of the whole module. The power divider 5 is used for signal distribution, and uniformly distributes the signals amplified by the gain to multiple channels, provides multiple input signals for the multi-stage power amplification circuit 6, realizes parallel processing and amplification of signals, and helps to improve the overall power output capability. The multi-stage power amplification circuit 6 is used for amplifying signals, and can improve the signal power to a high level through multi-stage amplification, so as to meet the output requirements of the high-power microwave solid-state source. The combiner 7 is used for signal synthesis, and synthesizes multiple signals amplified by multiple stages into an output signal, ensures the stability and consistency of the output signal, and improves the quality of the output power. The power detection circuit 8 is used for monitoring the size of the output power in real time, and feeds back the detection result to the main control circuit 9. The main control circuit 9 can adjust other circuit modules according to the detection result, realizes accurate control and stable adjustment of the output power. The main control circuit 9 is used for controlling the work of each circuit module, realizes automatic management of the whole module through the cooperative control of each circuit module, so that the module can automatically adjust the working state of each circuit module according to different working requirements and environmental conditions, and improves the intelligent degree and stability of the module.

[0036] In one embodiment, the high-power microwave solid-state source module further comprises a water-cooled base 10 and a shielding cover 11, which is arranged on the top of the water-cooled base 10. The adjustable signal source 1, the analog electrically adjustable attenuation control circuit 2, the radio frequency switch 3, the gain power amplifier module 4, the power divider 5, the multi-stage power amplification circuit 6, the combiner 7, the power detection circuit 8 and the main control circuit 9 are arranged in the space enclosed by the shielding cover 11. The water-cooled base 10 is connected with a cooling water pipeline, and the circulating flow of the cooling water can effectively take away the heat generated by the operation of the module. The shielding cover 11 can effectively reduce the radiation generated by the module and prevent external interference.

[0037] In one embodiment, the high-power microwave solid-state source module further comprises a temperature and current detection circuit 12, the input ends of which are connected with the multi-stage power amplification circuit 6 and the main control circuit 9, respectively. The temperature and current detection circuit 12 is used for real-time detection of the working temperature and working current of the multi-stage power amplification circuit 6 and feedback to the main control circuit 9. Through real-time detection of the working current and temperature and feedback to the main control circuit 9, the main control circuit 9 can adjust other circuit modules such as the analog electrically adjustable attenuation control circuit 2 and the adjustable signal source 1 based on these information, so that the module can maintain stable power output under different working temperature and current conditions, improve the stability and precision of the output power, and meet the application scenarios with high-precision microwave output requirements. When the temperature rises close to or exceeds the safety threshold, the main control circuit 9 can adjust the working state of the module, such as reducing the output power and increasing the working intensity of the heat dissipation device (such as increasing the cooling water flow of the water-cooled base 10), so as to avoid thermal runaway caused by excessive temperature and prevent the components in the multi-stage power amplification circuit 6 from being damaged due to overheating, thereby prolonging the service life of the entire module.

[0038] In one embodiment, the adjustable signal source 1 selects a broadband frequency synthesizer integrated with a VCO, and the output frequency (900MHz-930MHz) is realized by the SPI interface of the MCU of the main control circuit 9. The use of the broadband frequency synthesizer integrated with a VCO integrates the voltage-controlled oscillator (VCO) and the frequency synthesis function together, reduces the complexity and volume of the circuit, improves the integration of the entire module, and makes the module structure more compact, facilitating installation and maintenance.

[0039] In one embodiment, the analog electrically adjustable attenuation control circuit 2 comprises a symmetrical π-type attenuation network composed of PIN diodes and voltage dividing resistors. The PIN diodes exhibit different linear resistances to microwave signals based on different bias currents. This circuit utilizes this characteristic to accurately control the attenuation of the π-type attenuation network by controlling the analog DC bias (0-10V) given by the MCU of the main control circuit 9 through the DAC, thereby realizing large-scale adjustment of the output power (10W-1500W) of the latter stage and meeting the diversified power requirements of different application scenarios.

[0040] Specifically, the analog electrically tunable attenuation control circuit 2 comprises diode D1, diode D2, diode D3, diode D4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, the output end of the adjustable signal source 1 is connected to the negative pole of the diode D1, the negative pole of the diode D2 and one end of the resistor R1 respectively, the positive pole of the diode D1 is connected to one end of the resistor R4, one end of the capacitor C2 and one end of the capacitor C3 respectively, the other end of the resistor R4 is connected to one end of the resistor R5 and the power supply voltage respectively, the other end of the resistor R5 is connected to the positive pole of the diode D3, one end of the capacitor C4 and one end of the capacitor C5 respectively, the negative pole of the diode D3 is connected to the negative pole of the diode D4, one end of the resistor R3 and the input end of the radio frequency switch 3 respectively, the positive pole of the diode D2 is connected to the positive pole of the diode D4 and one end of the resistor R2 respectively, the other end of the resistor R2 is connected to one end of the capacitor C1 and the adjustable analog voltage output end of the main control circuit 9 respectively, the other end of the resistor R1, the other end of the resistor R3, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded.

[0041] Among them, the power supply voltage is generally +5V, the adjustable analog voltage output end of the main control circuit 9 outputs the adjustable analog voltage V ATT, which is generally 0-10V, controlled by the MCU of the main control circuit 9. The diode D1, the diode D2, the diode D3 and the diode D4 are PIN diodes, and the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the capacitor C5 are filter capacitors, which can effectively filter out interference signals and ensure the stability of the circuit and the quality of the signal. The resistor R1 is used for voltage division with the resistor R2 and the resistor R4 to adjust the voltage of node 1, so that the PIN diode presents different resistance values for the radio frequency signal, and forms a π type attenuation network with the resistance value presented by the PIN diode; in addition, the resistor R2 participates in the formation of the π type attenuation network in addition to voltage division with the resistor R1. The resistor R1, the resistor R2 and the resistor R3 are generally hundreds of levels, the resistor R4 and the resistor R5 are generally K levels, and the selection of the PIN diode mainly depends on the parameter resistance value and reverse bias voltage curve.

[0042] In one embodiment, the radio frequency switch 3 is a high-speed radio frequency switch. The selection of the high-speed radio frequency switch can realize fast switching action under the control of the analog high and low voltage given by the MCU of the main control circuit 9, which meets the requirements of the pulse signal output mode. The fast response characteristics of the high-speed radio frequency switch enable the module to perform operations timely and accurately in the case of needing to quickly switch the signal on and off, avoid the delay and distortion of signal transmission, and improve the signal processing speed and control accuracy of the whole module

[0043] In one embodiment, the gain power amplifier module 4 is a pre-push and push amplifier, and the combination of the pre-push and push amplifier can provide sufficient pre-stage gain and amplification for the signal, so as to improve the power amplification efficiency and performance of the module.

[0044] In one embodiment, the power divider 5 is a Wilkinson power divider. The Wilkinson power divider can uniformly distribute the input signal to each output branch, so as to ensure the consistency and balance of each branch signal, and provide a good foundation for the subsequent parallel processing of the multi-stage power amplification circuit 6, so that the multi-stage power amplification circuit 6 can fully play a role, and the overall power output capability and efficiency are improved. In addition, the Wilkinson power divider has good isolation performance, which can effectively reduce the mutual interference between each output branch, so as to ensure the stability and independence of the signal in the distribution process, and improve the anti-interference ability and reliability of the module.

[0045] In one embodiment, the multi-stage power amplification circuit 6 includes a plurality of parallel final-stage power amplifiers, the input ends of the plurality of final-stage power amplifiers are connected with the corresponding output branches of the power divider 5, the control ends of the plurality of final-stage power amplifiers are connected with the main control circuit 9, and the output ends of the plurality of final-stage power amplifiers are connected with the input end of the combiner 7 through the isolator 13. The plurality of parallel final-stage power amplifiers can perform multi-stage amplification on the signal power through cooperation with the power divider 5 and the combiner 7, so as to finally realize large-power output and meet the demand of the large-power microwave solid-state source. The isolator 13 is used to isolate the signal power reflected from the back, because the standing wave at the synthesis position is generally much larger than the normal transmission, and a large amount of power may be reflected back. The use of the isolator 13 can ensure the safety of the amplifier circuit.

[0046] In one embodiment, the combiner 7 is a suspended-band power combiner, i.e. an impedance transformation combiner based on a suspended band, which can realize efficient impedance matching and signal synthesis, effectively combine the plurality of amplified signals into an output signal, reduce the loss and reflection of the signal in the synthesis process, and improve the synthesis efficiency of the signal and the quality of the output power. The suspended-band structure has good performance in a high-frequency environment, can adapt to the signal processing of the microwave frequency band, and ensures the stability and reliability of the combiner 7 under high-frequency working conditions, so as to meet the requirements of the microwave solid-state source module for high-frequency signal processing.

[0047] In one embodiment, the main control circuit 9 is connected with an external computer through a single-chip microcomputer or a serial port, so that the user can remotely control and monitor the module through the computer, real-time understand the working state and parameters of the module, facilitate parameter adjustment and fault diagnosis, and improve the use convenience and intelligent management level of the module.

[0048] It should be noted that the adjustable signal source 1, the radio frequency switch 3, the gain power amplifier module 4, the power divider 5, the multi-stage power amplification circuit 6, the combiner 7, the power detection circuit 8, the main control circuit 9, the temperature and current detection circuit 12 and the isolator 13 in the utility model all adopt the prior art well known by the person skilled in the art. In order to make the description more concise and clear, avoid repetition, the specific structure and detailed circuit of these components will not be described in detail here.

[0049] It should be understood that the above description can be improved or changed by the person skilled in the art, and all these improvements and changes shall belong to the protection scope of the claims of the utility model.

[0050] The utility model patent has been described above in conjunction with the drawings, obviously the implementation of the utility model patent is not limited by the above-mentioned mode, as long as various improvements are made by adopting the method concept and technical scheme of the utility model patent, or the concept and technical scheme of the utility model patent is directly applied to other occasions without improvement, all of which are within the protection scope of the utility model.

Claims

1. A high power microwave solid state source module, characterized in that, The adjustable signal source, the analog electrically adjustable attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multi-stage power amplification circuit, the combiner, the power detection circuit and the main control circuit are arranged in the space surrounded by the water-cooled base and the shielding cover. The input end of the adjustable signal source is connected with an input power supply, and the output end of the adjustable signal source is connected with the analog electrically adjustable attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multi-stage power amplification circuit and the combiner in sequence. The power detection circuit is coupled with the output end of the combiner. The main control circuit is connected with the control end of the adjustable signal source, the control end of the analog electrically adjustable attenuation control circuit, the control end of the radio frequency switch, the control end of the gain power amplifier module, the control end of the multi-stage power amplification circuit and the output end of the power detection circuit respectively.

2. The high power microwave solid state source module of claim 1, wherein, The adjustable signal source, the analog electrically adjustable attenuation control circuit, the radio frequency switch, the gain power amplifier module, the power divider, the multi-stage power amplification circuit, the combiner, the power detection circuit and the main control circuit are arranged in the space surrounded by the water-cooled base and the shielding cover.

3. The high power microwave solid state source module of claim 1, wherein, The adjustable signal source is a broadband frequency synthesizer integrated with a VCO.

4. The high power microwave solid state source module of claim 1, wherein, The analog electrically adjustable attenuation control circuit comprises a symmetrical π-type attenuation network composed of PIN diodes and voltage dividing resistors.

5. The high power microwave solid state source module of claim 1, wherein, The radio frequency switch is a high-speed radio frequency switch.

6. The high power microwave solid state source module of claim 1, wherein, The gain power amplifier module is a pre-push and push amplifier.

7. The high power microwave solid state source module of claim 1, wherein, The power divider is a Wilkinson power divider.

8. The high power microwave solid state source module of claim 1, wherein, The multi-stage power amplification circuit comprises a plurality of parallel final-stage power amplifiers, the input ends of the final-stage power amplifiers are connected with corresponding output branches of the power divider respectively, the control ends of the final-stage power amplifiers are connected with the main control circuit, and the output ends of the final-stage power amplifiers are connected with the input end of the combiner through isolators.

9. The high power microwave solid state source module of claim 1, wherein, The combiner is a suspended-band power combiner.

10. The high power microwave solid state source module of claim 1, wherein, The main control circuit is connected with an external computer through a single-chip microcomputer or a serial port.

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