CN111130470B - Solid microwave generating device - Google Patents
Solid microwave generating device Download PDFInfo
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- CN111130470B CN111130470B CN201911423295.2A CN201911423295A CN111130470B CN 111130470 B CN111130470 B CN 111130470B CN 201911423295 A CN201911423295 A CN 201911423295A CN 111130470 B CN111130470 B CN 111130470B
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
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Abstract
The invention discloses a solid-state microwave generating device, which comprises a power amplifying tube, a drain electrode power supply regulating circuit, a feedback circuit and a control unit, wherein the power amplifying tube is connected with the drain electrode power supply regulating circuit; the control unit is connected with the drain power supply adjusting circuit and is used for sending a drain power supply adjusting signal to the drain power supply adjusting circuit; the drain power supply adjusting circuit is connected with the drain electrode of the power amplifying tube and is used for receiving the drain power supply adjusting signal sent by the control unit and adjusting the drain power supply of the power amplifying tube under the control of the drain power supply adjusting signal; the drain electrode of the power amplifier tube is connected with the grid electrode of the power amplifier tube through the feedback circuit; and the drain electrode of the power amplifying tube is used for outputting microwave signals. The device can generate medium and high power microwave signals by using the feedback circuit and the 1-level power amplifying tube, can regulate the power, has smaller body area and greatly reduces the cost.
Description
Technical Field
The invention relates to the technical field of microwave generation, in particular to a solid-state microwave generation device.
Background
The microwave can be used for transmitting information and can also be used as energy, and is applied to the fields of heating, drying, sterilization, disinfection, semiconductor manufacturing and the like.
The medium and high power microwaves are generally generated by a magnetron. The magnetron is essentially a diode placed in a constant magnetic field. Electrons in the tube interact with the high-frequency electromagnetic field under the control of the mutually perpendicular constant magnetic field and constant electric field to convert energy obtained from the constant electric field into microwave energy, thereby achieving the purpose of generating microwave energy. The magnetron requires high voltage of kilovolts to operate, which brings about potential safety hazards and also makes the microwave generating device bulky. The mechanism of the magnetron determines that the power of the microwave signal is not continuously adjustable.
In order to solve the defects of the magnetron microwave generating device, in recent years, a learner uses a solid-state device to generate medium and high power microwaves, basically refers to a radio frequency amplifying tube structure in wireless communication, in order to generate medium and high power microwave signals, the structure generally needs 3-4 stages or more power amplifying tube cascades, a specific common structure is shown in fig. 1, a microwave generating circuit is connected with a multi-stage power amplifying tube, specifically, the microwave generating circuit is sequentially connected with two A-type amplifying tubes, one AB-type amplifying tube and one C-type amplifying tube, an amplitude modulator is connected between the two A-type amplifying tubes, a unidirectional conducting device is connected between the AB-type amplifying tube and the C-type amplifying tube, a frequency adjusting signal is input into the microwave generating circuit to adjust the frequency of an output microwave signal, and a power adjusting signal is input into the amplitude modulator to adjust the power of the output microwave signal. By adopting the framework, the system has high cost and large volume (area), which restricts the scale application of the solid-state microwave generating device in the microwave energy industry.
Disclosure of Invention
The invention aims to overcome at least one defect (deficiency) of the prior art, and provides a solid-state microwave generating device which can generate medium and high power microwaves with adjustable power and frequency and has smaller volume.
The technical proposal adopted by the invention is that,
a solid microwave generating device comprises a power amplifying tube, a drain electrode power supply regulating circuit, a feedback circuit and a control unit; the control unit is connected with the drain power supply adjusting circuit and is used for sending a drain power supply adjusting signal to the drain power supply adjusting circuit; the drain power supply adjusting circuit is connected with the drain electrode of the power amplifying tube and is used for receiving the drain power supply adjusting signal sent by the control unit and adjusting the drain power supply of the power amplifying tube under the control of the drain power supply adjusting signal; the drain electrode of the power amplifier tube is connected with the grid electrode of the power amplifier tube through the feedback circuit; and the drain electrode of the power amplifying tube is used for outputting microwave signals.
The solid-state microwave generating device provided by the invention designs the power amplifying tube into a voltage-controlled oscillator through the feedback circuit, and the drain electrode of the power amplifying tube is connected with the grid electrode of the power amplifying tube through the feedback circuit, so that a voltage-controlled oscillator is formed; the frequency of the output signal of the oscillator is determined by the voltage of the grid electrode of the power amplifying tube, and the maximum output power is determined byThe saturation power of the power amplifier under the large drain operating voltage is determined, therefore, when the system needs to adjust the power of the oscillator output signal, the control unit sends a drain power supply adjusting signal to the drain power supply adjusting circuit connected with the system for adjustment, and the drain power supply adjusting circuit is used for receiving the signal and adjusting the drain power supply of the power amplifier according to the signal so as to adjust the output power according to P=U 2 The ratio of/2R can be found as follows: as the voltage decreases, the power decreases exponentially with the voltage. Therefore, when the system needs power adjustment, the control unit outputs a drain power supply adjusting signal to the drain power supply adjusting circuit, and the output voltage of the circuit changes along with the change, so that the output power of an oscillator formed by the power amplifying tube changes along with the change; the output signal of the oscillator is output from the drain of the power amplifier.
The solid microwave generating device can generate medium and high power microwave signals by utilizing the voltage-controlled oscillator consisting of the feedback circuit and the 1-level power amplifying tube, and can regulate the power of the microwave signals through the drain electrode power supply regulating circuit and the control unit, thereby having smaller volume and area of the device and greatly reducing the cost.
Further, the device also comprises a grid power supply regulating circuit; the control unit is also connected with the grid power supply adjusting circuit and is used for sending a first grid power supply adjusting signal to the grid power supply adjusting circuit; the grid power supply adjusting circuit is connected with the grid of the power amplifier tube and used for receiving a first grid power supply adjusting signal sent by the control unit and adjusting grid power supply of the power amplifier tube under the control of the first grid power supply adjusting signal.
When the system needs to adjust the frequency of the oscillator output signal, the control unit sends a first grid power supply adjusting signal to the grid power supply adjusting circuit connected with the control unit, and the grid power supply adjusting circuit adjusts the grid voltage according to the signal after receiving the signal so as to adjust the frequency of the oscillator output signal; in the device provided by the invention, the control unit uniformly sends the first grid power supply adjusting signal and the drain power supply adjusting signal to different elements for monitoring and management, so that the device can more accurately adjust the power and the frequency of the output signal.
Further, the circuit also comprises a grid bias circuit, a microwave source and a phase discriminator;
the control unit is also connected with the microwave source and used for sending a microwave source adjusting signal to the microwave source;
the microwave source is connected with the phase discriminator and is used for receiving a microwave source adjusting signal sent by the control unit and outputting a microwave frequency modulation signal under the control of the microwave source adjusting signal;
the phase discriminator is also connected with the grid bias circuit and the drain electrode of the power amplifier tube, and is used for receiving the microwave frequency modulation signal output by the microwave source and part of the microwave signal output by the drain electrode of the power amplifier tube, and outputting a second grid power supply adjusting signal to the grid bias circuit according to the microwave frequency modulation signal and part of the microwave signal;
the grid bias circuit is connected with the grid of the power amplifier tube and is used for receiving a second grid power supply adjusting signal sent by the phase discriminator and adjusting the grid power supply of the power amplifier tube under the control of the second grid power supply adjusting signal.
The control unit is connected with the microwave source, and sends a microwave source adjusting signal to the microwave source according to the frequency adjusting requirement of the system on the oscillator output signal, and the microwave source sends a corresponding microwave frequency modulation signal to the phase discriminator after receiving the microwave source adjusting signal; the phase discriminator receives the microwave frequency modulation signal sent by the microwave source and the microwave signal output by the drain electrode of the partial power amplifier, identifies the phase difference between the two signals, determines the adjusting range of the grid voltage of the oscillator according to the phase difference, and outputs a second grid power supply adjusting signal to the grid bias circuit so that the frequency of the microwave signal output by the drain electrode of the power amplifier is consistent with the frequency of the microwave frequency modulation signal sent by the microwave source.
Further, the grid electrode of the power amplifying tube is connected with the grid electrode power supply adjusting circuit/the grid electrode biasing circuit through a loop filter circuit;
the loop filter circuit is used for filtering signals input to the grid power supply adjusting circuit/the grid bias circuit. The loop filter circuit filters interference signals, and the filtering of the interference signals enables the power supply signals of the grid electrode of the power amplifying tube to be more accurate, so that the frequency of the microwave signals output by the drain electrode is closer to the microwave frequency modulation signals of the microwave source.
Further, the drain power supply adjusting circuit is connected with the drain electrode of the power amplifying tube through a drain electrode biasing circuit, and the drain electrode biasing circuit adjusts the power supply signal of the drain electrode of the power amplifying tube output by the drain power supply adjusting circuit and outputs the drain electrode of the power amplifying tube. The drain bias circuit receives the power supply signal output by the drain power supply adjusting circuit, adjusts the voltage of the drain of the power amplifying tube, the microwave signal power output by the power amplifying tube is determined by the drain voltage of the power amplifying tube, and the drain voltage is adjusted through the drain bias circuit, so that the adjusting effect is better and more accurate.
Further, the power amplifying tube is formed by connecting a plurality of power amplifying tubes in parallel. Since the maximum power of the microwave signal output is determined by the saturated power of the power amplifier under the maximum drain operating voltage, when the saturated power of a single power amplifier is not large enough, a plurality of power amplifiers can be used for increasing the saturated power in parallel.
Further, the microwave source comprises a voltage-controlled oscillator circuit or a phase-locked loop circuit, and the phase-locked loop circuit can be realized by a phase-locked loop or by a phase-locked loop frequency doubler or a phase-locked loop frequency divider.
Compared with the prior art, the invention has the beneficial effects that:
(1) The power amplifier tube and the feedback circuit are combined to design an oscillation oscillator, so that medium-power and high-power microwaves can be generated, the power and the frequency of microwave signals can be regulated by combining the grid power supply regulating circuit and the drain power supply regulating circuit, the power amplifier tube is only a 1-stage power amplifier tube, the volume and the area of the whole device are reduced, the cost is greatly reduced, and the frequency and the power of the generated microwave signals can be regulated, so that the application requirements of different fields are met;
(2) The phase-locked loop formed by the phase discriminator adjusts the phase difference between the microwave frequency-modulated signal sent by the microwave source and the microwave signal output by the power amplifying tube, so that the frequency of the microwave signal output by the power amplifying tube can be consistent with the frequency of the microwave frequency-modulated signal sent by the microwave source with smaller error.
Drawings
Fig. 1 is a schematic circuit diagram of a conventional structure for generating a medium and high power microwave signal in the prior art.
Fig. 2 is a schematic circuit diagram of a voltage-controlled oscillator device with adjustable power in embodiment 1 of the present invention.
Fig. 3 is a schematic circuit diagram of a voltage-controlled oscillator device with adjustable power frequency in embodiment 2 of the present invention.
Fig. 4 is a schematic circuit diagram of a solid-state microwave generating device in embodiment 3 of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 2, the present embodiment provides a voltage controlled oscillator device with adjustable power, which can be applied to any applicable circuit unit and system, which are collectively referred to as "system" hereinafter in embodiment 1. The device comprises a power amplifier tube 1, a feedback circuit 2, a drain power supply regulating circuit 3 and a control unit 4.
The grid electrode of the power amplifier tube 1 is connected with the feedback circuit 2, and the feedback circuit 2 is connected with the drain electrode of the power amplifier tube 1, so that the drain electrode of the power amplifier tube 1 is connected with the grid electrode; the drain power supply regulating circuit 3 is connected with the drain of the power amplifier tube 1, and the control unit 4 is connected with the drain power supply regulating circuit 3.
The power amplifying tube 1 and the feedback circuit 2 form a voltage-controlled oscillator, and the control unit 4 is used for outputting a drain power supply regulating signal to the drain power supply regulating circuit 3 according to the power requirement of the system on the oscillator output signal; the drain power supply adjusting circuit 3 adjusts the drain voltage of the power amplifier 1 according to the received drain power supply adjusting signal.
The voltage-controlled oscillator device with adjustable power provided in the embodiment is designed into a voltage-controlled oscillator by combining the feedback circuit 2 and the power amplifier 1, and the maximum power output by the oscillator is determined by the saturated power of the power amplifier 1 under the maximum drain operating voltage. Therefore, when the system needs power adjustment, the control unit 4 sends a drain power supply adjustment signal to the drain power supply adjustment circuit 3 connected with the control unit to adjust, and the drain power supply adjustment circuit 3 adjusts the drain power supply of the power amplifying tube 1 according to the signal to adjust the output power; in the specific implementation process, the drain electrode of the power amplifying tube 1 can be powered by the drain electrode power supply adjusting circuit 3 from a power supply source, the power supply source can also supply power to the control unit 4, and after the drain electrode power supply adjusting circuit 3 receives a drain electrode power supply adjusting signal output by the control unit 4, the power supply source, preferably the voltage of the power supply source, is adjusted, and at the moment, the drain electrode power supply adjusting signal is a voltage adjusting signal to adjust the drain electrode voltage of the power amplifying tube 1. According to p=u 2 The ratio of/2R can be found as follows: as the voltage decreases, the power decreases exponentially with the voltage. Thus when the system requires power regulation, the control unit 4 outputs a drain power regulation signal to the drain power regulation circuit 3, the output voltage of which varies with the change in output power of the oscillator made up of the power amplifier 1. In practical application, the drain power supply adjusting circuit 3 can be designed as an independent unit alone or integrated into a power supply of the device.
The solid-state microwaves of the embodiment can generate medium-power and high-power microwave signals by using the feedback circuit and the 1-level power amplifying tube, the power of the microwave signals can be adjusted, the device volume and the area are smaller, the cost is greatly reduced, the power of the generated microwave signals can be adjusted, and the application requirements of different fields are met.
Preferably, the power amplifier 1 may be formed by connecting a plurality of power amplifiers in parallel. Since the maximum power of the microwave signal output is determined by the saturated power of the power amplifier under the maximum drain operating voltage, when the saturated power of the single power amplifier 1 is not large enough, a plurality of power amplifiers can be used in parallel to increase the saturated power.
Example 2
As shown in fig. 3, the present embodiment provides a voltage controlled oscillator device capable of adjusting the power frequency, which is applicable to any applicable circuit unit and system, which are collectively referred to as "system" hereinafter in embodiment 1. The device comprises a power amplifier tube 1, a feedback circuit 2, a drain power supply regulating circuit 3, a control unit 4 and a first grid power supply regulating circuit 5.
The grid electrode of the power amplifier tube 1 is connected with the feedback circuit 2, and the feedback circuit 2 is connected with the drain electrode of the power amplifier tube 1, so that the drain electrode of the power amplifier tube 1 is connected with the grid electrode; the drain power supply adjusting circuit 3 is connected with the drain of the power amplifier tube 1, the control unit 4 is connected with the drain power supply adjusting circuit 3 and also connected with the first grid power supply adjusting circuit 5, and the first grid power supply adjusting circuit 5 is connected with the grid of the power amplifier tube 1.
The power amplifying tube 1 and the feedback circuit 2 form a voltage-controlled oscillator, and the control unit 4 is used for outputting a drain power supply adjusting signal to the drain power supply adjusting circuit 3 according to the power requirement of the system on the oscillator output signal; the drain power supply adjusting circuit 3 adjusts the drain voltage of the power amplifier tube 1 according to the received drain power supply adjusting signal; the control unit 4 is configured to output a first gate power supply adjustment signal to the gate power supply adjustment circuit 5 according to a frequency requirement of the system on the output signal of the oscillator; the gate power supply adjusting circuit 5 adjusts the gate voltage of the power amplifier 1 according to the received first gate power supply adjusting signal.
The embodiment provides an adjustable power frequencyThe voltage-controlled oscillator device is designed into a voltage-controlled oscillator by combining the feedback circuit 2 and the power amplifier 1, the maximum power output by the oscillator is determined by the saturated power of the power amplifier 1 under the maximum drain operating voltage, and the output signal frequency of the oscillator is determined by the gate voltage of the power amplifier 1. Therefore, when the system needs power adjustment, the control unit 4 sends a drain power supply adjustment signal to the drain power supply adjustment circuit 3 connected with the control unit to adjust, and the drain power supply adjustment circuit 3 adjusts the drain power supply of the power amplifying tube 1 according to the signal to adjust the output power; in the specific implementation process, the drain electrode of the power amplifying tube 1 can obtain power supply from a power supply source through the drain electrode power supply adjusting circuit 3, the power supply source can also supply power to the control unit 4, and after the drain electrode power supply adjusting circuit 3 receives a drain electrode power supply adjusting signal output by the control unit 4, the power supply source, preferably the voltage of the power supply source, is adjusted, and at the moment, the drain electrode power supply adjusting signal is a voltage adjusting signal to adjust the drain electrode voltage of the power amplifying tube 1. According to p=u 2 The ratio of/2R can be found as follows: as the voltage decreases, the power decreases exponentially with the voltage. Thus when the system requires power regulation, the control unit 4 outputs a drain power regulation signal to the drain power regulation circuit 3, the output voltage of which varies with the change in output power of the oscillator made up of the power amplifier 1. In practical application, the drain power supply adjusting circuit 3 can be designed as an independent unit alone or integrated into a power supply of the device.
When the system needs frequency adjustment, the control unit 4 sends a first gate power supply adjustment signal to the gate power supply adjustment circuit 5, and the gate power supply adjustment circuit 5 adjusts the gate voltage according to the signal after receiving the signal, so as to achieve the purpose that the power amplifier 1 oscillates and outputs signals with different microwave frequencies.
The solid-state microwaves of the embodiment can generate medium-power and high-power microwave signals by using the feedback circuit and the 1-level power amplifying tube, the power of the microwave signals can be adjusted, the device volume and the area are smaller, the cost is greatly reduced, and the frequency and the power of the generated microwave signals can be adjusted, so that the application requirements of different fields are met.
Preferably, the power amplifier 1 may be formed by connecting a plurality of power amplifiers in parallel. Since the maximum power of the microwave signal output is determined by the saturated power of the power amplifier 1 at the maximum drain operating voltage, when the saturated power of the single power amplifier 1 is not large enough, the saturated power can be increased by using a plurality of power amplifiers in parallel.
Example 3
As shown in fig. 4, the present embodiment provides a solid-state microwave generating device applicable to any applicable circuit unit and system, which are collectively referred to as "system" hereinafter in embodiment 3. The device comprises a power amplifier tube 1, a feedback circuit 2, a drain bias circuit 11, a drain power supply regulating circuit 3, a gate bias circuit 7, a control unit 4, a microwave source 8, a phase detector 9 and a loop filter circuit 10.
The drain electrode of the power amplifier tube 1 is connected with the feedback circuit 2, the feedback circuit 2 is connected with the grid electrode of the power amplifier tube 1, the drain electrode of the power amplifier tube 1 is connected with the drain electrode bias circuit 11, the drain electrode bias circuit 11 is connected with the drain electrode power supply regulating circuit 3, and the drain electrode power supply regulating circuit 3 is connected with the control unit 4; the grid electrode of the power amplifier tube 1 is connected with a grid electrode bias circuit 7, and the grid electrode bias circuit 7 is connected with a loop filter circuit 10; the microwave source 8 is connected with the phase detector 9, the phase detector 9 is connected with the loop filter circuit 10, and the phase detector 9 is also connected with the drain electrode of the power amplifier tube 1.
The control unit 4 is used for outputting a drain power supply adjusting signal to the drain power supply adjusting circuit 3 and outputting a microwave source adjusting signal to the microwave source 8 according to the requirements of the system on the frequency and the power of the oscillator output signal; the drain power supply adjusting circuit 3 adjusts the drain power supply adjusting signal, then outputs a power supply signal of the drain of the power amplifier 1 to the drain bias circuit 11, the drain bias circuit 11 receives the signal and adjusts the power supply signal, namely, the drain voltage of the power amplifier 1, the output signal of the oscillator is output through the drain of the power amplifier 1, and part of the output signal is output to the phase detector 9. Specifically, the phase detector 9 is connected to the drain of the power amplifier 1 through a sampling circuit, and the sampling circuit samples a small portion of the microwave signal output from the drain of the power amplifier 1 and outputs the sampled microwave signal to the phase detector.
After receiving the microwave source adjusting signal output by the control unit 4, the microwave source 8 outputs a microwave frequency modulation signal to the phase discriminator 8 according to the microwave source adjusting signal, extracts a part of samples from the output signal of the drain electrode of the power amplifier 1 and outputs the extracted samples to the phase discriminator 9, the phase discriminator 9 at this time determines the phase difference between the microwave frequency modulation signal received from the microwave source 1 and the samples, and outputs a second grid power supply adjusting signal to the loop filter circuit 9 according to the phase difference, and the loop filter circuit 9 filters an interference signal in the second grid power supply adjusting signal and outputs the interference signal to the grid bias circuit 7 to adjust the grid voltage.
The solid-state microwave generating device provided in this embodiment is designed as a voltage-controlled oscillator by combining the feedback circuit 2 and the power amplifier 1, the output signal frequency of the oscillator is determined by the gate voltage of the power amplifier 1, and the maximum output power is determined by the saturated power of the power amplifier 1 under the maximum drain operating voltage.
Therefore, when the system needs power adjustment, the control unit 4 sends a drain power supply adjustment signal to the drain power supply adjustment circuit 3 connected with the control unit to adjust, the drain power supply adjustment circuit 3 combines with the drain bias circuit 11 to provide bias voltage to the drain of the power amplifier tube 1, so as to adjust the drain power supply of the power amplifier tube 1 to adjust the power of the oscillator output signal, and the microwave signal output by the power amplifier tube 1 is output through the drain thereof; in the specific implementation process, the drain electrode of the power amplifying tube 1 can obtain power supply from the power supply source through the drain electrode power supply adjusting circuit 3, and after the drain electrode power supply adjusting circuit 3 receives the drain electrode power supply adjusting signal output by the control unit 4, the voltage of the power supply source, preferably the power supply source, is adjusted, and at this time, the drain electrode power supply adjusting signal is a voltage adjusting signal to adjust the drain electrode voltage of the power amplifying tube 1. According to p=u 2 The ratio of/2R can be found as follows: as the voltage decreases, the power decreases exponentially with the voltage. Thus when the system requires power regulation, the control unit 4 outputs a drain power regulation signal to the drain power regulation circuit 3, which circuitThe output voltage varies with the output power of the oscillator constituted by the power amplifier 1. In practical application, the drain power supply adjusting circuit 3 can be designed as an independent unit alone or integrated into a power supply of the device.
When the system needs frequency adjustment, the control unit 4 sends a microwave source adjusting signal to the microwave source 8, after the microwave source 8 receives the microwave source adjusting signal output by the control unit 4, the microwave source 8 outputs a microwave frequency modulation signal to the phase discriminator 9 according to the microwave source adjusting signal, a part of samples are extracted from the output signal of the drain electrode of the power amplification tube 1 and output to the phase discriminator 9, the phase discriminator 9 at this time determines the phase difference between the microwave frequency modulation signal received from the microwave source 1 and the samples, and outputs a second grid power supply adjusting signal to the loop filter circuit 9 according to the phase difference, the loop filter circuit 9 filters an interference signal in the second grid power supply adjusting signal, and outputs the interference signal to the grid bias circuit 7 to adjust the grid voltage so that the frequency of the microwave signal output by the drain electrode of the power amplification tube 1 is consistent with the frequency of the microwave frequency modulation signal sent by the microwave source 8; after receiving the second gate power supply adjusting signal, the loop filter circuit 9 filters the signal to filter the interference signal, so that the frequency of the microwave signal output by the drain electrode of the power amplifying tube 1 is closer to the microwave frequency modulation signal of the microwave source 1.
The solid-state microwave generating device of the embodiment can generate medium and high power microwave signals by using the feedback circuit and the 1-level power amplifier 1, can adjust the frequency and the power of the microwave signals, has smaller device volume and area, and greatly reduces the cost; the control unit 5 is used for monitoring and managing the output power of the microwave signal and the frequency of the microwave signal by sending the microwave source adjusting signal and the drain power supply adjusting signal to different elements, so that the device can more accurately adjust the power and the frequency of the microwave signal; compared with the embodiments 1 and 2, the embodiment 3 adjusts the phase difference between the microwave frequency-modulated signal sent by the microwave source 8 and the microwave signal output by the power amplifier 1 through the phase discriminator 9, so that the frequency of the microwave signal output by the power amplifier 1 can be consistent with the frequency of the microwave frequency-modulated signal sent by the microwave source 8 with smaller error; in embodiment 3, the gate voltage is adjusted by the gate bias circuit 7, and the drain voltage is adjusted by the drain bias circuit 11, so that the adjustment effect is better and more accurate.
Example 4
The device comprises a power amplifier tube 1, a feedback circuit 2, a drain bias circuit 11, a drain power supply regulating circuit 3, a grid bias circuit 7, a control unit 4, a microwave source 8, a phase detector 9, a loop filter circuit 10 and a second grid power supply regulating circuit.
The drain electrode of the power amplifier tube 1 is connected with the feedback circuit 2, the feedback circuit 2 is connected with the grid electrode of the power amplifier tube 1, the drain electrode of the power amplifier tube 1 is connected with the drain electrode bias circuit 11, the drain electrode bias circuit 11 is connected with the drain electrode power supply regulating circuit 3, and the drain electrode power supply regulating circuit 3 is connected with the control unit 4; the grid electrode of the power amplifier tube 1 is connected with a grid electrode bias circuit 7, a first end of the grid electrode bias circuit 7 is connected with a loop filter circuit 10, and a second end of the grid electrode bias circuit 7 is connected with a second grid electrode power supply regulating circuit; the microwave source 8 is connected with the phase detector 9, the phase detector 9 is connected with the loop filter circuit 10, and the phase detector 9 is also connected with the drain electrode of the power amplifier tube 1.
The control unit 4 is configured to output a drain power supply adjustment signal to the drain power supply adjustment circuit 3 according to a frequency and power requirement of the system on an output signal of the oscillator, and output a microwave source adjustment signal to the microwave source 8 and the second gate power supply adjustment circuit; the drain power supply adjusting circuit 3 adjusts the drain power supply adjusting signal, then outputs a power supply signal of the drain of the power amplifier 1 to the drain bias circuit 11, the drain bias circuit 11 receives the signal and adjusts the power supply signal, namely, the drain voltage of the power amplifier 1, the output signal of the oscillator is output through the drain of the power amplifier 1, and part of the output signal is output to the phase detector 9. Specifically, the phase detector 9 is connected to the drain of the power amplifier 1 through a sampling circuit, and the sampling circuit samples a small portion of the microwave signal output from the drain of the power amplifier 1 and outputs the sampled microwave signal to the phase detector.
After the microwave source 8 receives the microwave source adjusting signal output by the control unit 4, outputs a microwave frequency modulation signal to the phase discriminator 8 according to the microwave source adjusting signal, extracts a part of samples from the output signal of the drain electrode of the power amplifier 1, outputs the samples to the phase discriminator 9, determines the phase difference between the microwave frequency modulation signal received from the microwave source 1 and the samples, outputs a second grid power supply adjusting signal to the loop filter circuit 9 according to the phase difference, and provides the filtered signal of the loop filter circuit 9 to the grid bias circuit, and the grid bias circuit 7 and the second grid power supply adjusting circuit jointly adjust the grid voltage, wherein the adjusting signal output by the second grid power supply adjusting circuit is coarse adjustment, and the adjusting signal transmitted by the phase discriminator is fine adjustment.
The solid-state microwave generating device provided by the embodiment realizes the adjustment of the frequency of the microwave signal by adding the second grid power supply adjusting circuit and the phase discriminator together, and the accuracy of the output signal is improved to a greater extent.
Preferably, the power amplifier 1 may be formed by connecting a plurality of power amplifiers in parallel. Since the maximum power of the microwave signal output is determined by the saturated power of the power amplifier 1 at the maximum drain operating voltage, when the saturated power of a single power amplifier is not large enough, a plurality of power amplifiers can be used in parallel to increase the saturated power.
Preferably, the microwave source 8 comprises a voltage controlled oscillator circuit or a phase locked loop circuit. The phase-locked loop circuit can be realized by a phase-locked loop or a phase-locked loop frequency doubler or a phase-locked loop plus frequency divider.
It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and are not intended to limit the present invention to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The solid microwave generating device is characterized by comprising a power amplifying tube, a drain electrode power supply regulating circuit, a feedback circuit, a control unit, a grid bias circuit, a microwave source and a phase discriminator;
the control unit is connected with the drain power supply adjusting circuit and is used for sending a drain power supply adjusting signal to the drain power supply adjusting circuit;
the drain power supply adjusting circuit is connected with the drain electrode of the power amplifying tube and is used for receiving the drain power supply adjusting signal sent by the control unit and adjusting the drain power supply of the power amplifying tube under the control of the drain power supply adjusting signal;
the drain electrode of the power amplifier tube is connected with the grid electrode of the power amplifier tube through the feedback circuit;
the drain electrode of the power amplifying tube is used for outputting microwave signals;
the control unit is also connected with the microwave source and used for sending a microwave source adjusting signal to the microwave source;
the microwave source is connected with the phase discriminator and is used for receiving a microwave source adjusting signal sent by the control unit and outputting a microwave frequency modulation signal under the control of the microwave source adjusting signal;
the phase discriminator is also connected with the grid bias circuit and the drain electrode of the power amplifier tube, and is used for receiving the microwave frequency modulation signal output by the microwave source and part of the microwave signal output by the drain electrode of the power amplifier tube, and outputting a second grid power supply adjusting signal to the grid bias circuit according to the microwave frequency modulation signal and part of the microwave signal;
the grid bias circuit is connected with the grid of the power amplifier and is used for receiving a second grid power supply adjusting signal output by the phase discriminator and adjusting the grid power supply of the power amplifier under the control of the second grid power supply adjusting signal.
2. The solid state microwave generating device of claim 1, further comprising a gate power supply regulation circuit;
the control unit is also connected with the grid power supply adjusting circuit and is used for sending a first grid power supply adjusting signal to the grid power supply adjusting circuit;
the grid power supply adjusting circuit is connected with the grid of the power amplifier tube and used for receiving a first grid power supply adjusting signal sent by the control unit and adjusting grid power supply of the power amplifier tube under the control of the first grid power supply adjusting signal.
3. The solid state microwave generator of claim 2, wherein the gate of the power amplifier is connected to the gate supply regulator circuit/the gate bias circuit via a loop filter circuit;
the loop filter circuit is used for filtering signals input to the grid power supply adjusting circuit/the grid bias circuit.
4. The solid state microwave generator according to any one of claims 1 to 2, wherein the drain power supply adjustment circuit is connected to the drain of the power amplifier through a drain bias circuit, and the drain bias circuit adjusts the power supply signal of the drain of the power amplifier output by the drain power supply adjustment circuit and outputs the power supply signal to the drain of the power amplifier.
5. A solid state microwave generator according to any one of claims 1 to 2, wherein the power amplifying tube is formed by a plurality of power amplifying tubes connected in parallel.
6. A solid state microwave generating device according to any of claims 1 to 2, wherein the microwave source comprises a voltage controlled oscillator circuit or a phase locked loop circuit.
7. The solid state microwave generating device of claim 6, wherein the phase locked loop circuit comprises a phase locked loop, or comprises a phase locked loop and a frequency multiplier, or comprises a phase locked loop and a frequency divider.
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| CN201911423295.2A CN111130470B (en) | 2019-12-31 | 2019-12-31 | Solid microwave generating device |
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| CN201911423295.2A CN111130470B (en) | 2019-12-31 | 2019-12-31 | Solid microwave generating device |
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