CN107294503A - A kind of impedance automatic tuning system that can in real time monitor and compensate automatically - Google Patents
A kind of impedance automatic tuning system that can in real time monitor and compensate automatically Download PDFInfo
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- CN107294503A CN107294503A CN201710387490.9A CN201710387490A CN107294503A CN 107294503 A CN107294503 A CN 107294503A CN 201710387490 A CN201710387490 A CN 201710387490A CN 107294503 A CN107294503 A CN 107294503A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
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Abstract
The present invention relates to the automatic tunable technology field of broadband high-power radio frequency amplifier impedance, espespecially a kind of can apply controls the parameter for adjusting matching network to realize automatic compensation function in wideband high-frequency power source by monitoring the Tune-out angle of pre-amplifier output impedance in real time, a kind of impedance automatic tuning system that can in real time monitor and compensate automatically to solve tetrode prime Impedance Mismatch；The main control unit for including connecting by impedance resonance matching network and high frequency power source, the present invention is mainly one from the impedance-tumed technology of motion tracking, the Tune-out angle of monitoring pre-amplifier output impedance in real time is more specifically can be by control the parameter of adjustment matching network, the impedance variations that automatic compensation tetrode grid capacitance Ckg1 is caused in broadband, so that can be always ensured that tetrode grid input impedance is in resonance matching status in the range of whole broadband operation, so as to greatly improve the operating efficiency and overall performance of high-power tetrode amplifier.
Description
Technical field
The present invention relates to the automatic tunable technology field of broadband high-power radio frequency amplifier impedance, espespecially one kind can be applied
Wideband high-frequency power source controls to adjust the parameter of matching network by monitoring the Tune-out angle of pre-amplifier output impedance in real time
Automatic compensation function is realized, to solve a kind of impedance that can in real time monitor and compensate automatically of tetrode prime Impedance Mismatch certainly
Dynamic tuning system.
Background technology
In some particle accelerator high frequency power sources and the high-power short-wave transmitter field of microwave communication, or on basis
The proton and heavy ion avcceleration of scientific experiment research field, and Space Radiation Effects and Accelerator driven clean nuclear power device
It is middle require high-frequency high-power electronics tetrode amplifier in a wider frequency range frequency sweep work, for example for proton with
The ferrite loading radio-frequency acceleration cavity of heavy ion synchrotron and medical accelerator cancer-curing apparatus etc. is accomplished by high frequency power source
There is the ability to work of 2 frequency multiplication band above, in order to ensure that high frequency power source is capable of the work of normal reliable in broadband,
Power amplifier impedance matching at different levels is extremely important, due to tetrode grid-to-cathode capacitance Ckg1 presence, grid when frequency sweep works
Input impedance can change with frequency, cause tetrode prime Impedance Mismatch, causing the reflection power of pre-amplifier increases, shadow
The complete machine power output of power source is rung, causes the overall performance of power source to be deteriorated；In order to compensate the off resonance thereby resulted in, generally adopt
Technology is to install a passive impedance matching network additional between pre-amplifier and tetrode amplifier, and this is for arrowband
It is feasible for the power amplifier of working frequency, but due to being limited by component bandwidth, uncontrollable impedance matching net
Network can not meet the requirement of Broadband Matching, therefore not be suitable for the amplifier that frequency sweep works under broadband.Although Chinese special
Profit number is 201410300942.1, and patent name is adjusted for a kind of broadband high-power radio frequency sending set discloses a kind of width in machine method
Band high power RF emitter adjusts machine method, is directed to a kind of technology tuned automatically, i.e., in broadband high-power radio-frequency transmissions
When machine short pulse is run, emitter discharge-tube amplifier working conditions at different levels are monitored using data collecting system, are adopted by analysis
Each parameter of electron tube collected carrys out each tuned cell of feedback adjustment emitter, reaches emitter discharge-tube amplifier optimal
Working condition and maximum power output, although this method can reflect emitter electronics exactly with the formal science of data drawing list
The working condition of pipe amplifier, but monitoring and impedance in real time can not be carried out and tuned automatically.
The content of the invention
In order to overcome deficiency of the prior art, the present invention is intended to provide one kind is applied in particle accelerator high frequency power source
With the high-power short-wave transmitter field of microwave communication, or proton and the heavy ion acceleration in basic science experimental study field
Device, and Space Radiation Effects monitor pre-amplifier output impedance in real time with being used in Accelerator driven clean nuclear power device
Tune-out angle controls the parameter for adjusting matching network to carry out a kind of automatic energy compensated to solve tetrode prime Impedance Mismatch
The impedance automatic tuning system for monitoring and compensating automatically in real time.
To achieve the above object, the technical solution adopted by the present invention is：A kind of impedance that can in real time monitor and compensate automatically
Automatic tuning system, described impedance automatic tuning system mainly includes the control unit connected by impedance resonance matching network
And high frequency power source, wherein control unit is connected to impedance resonance matching network front end, and high frequency power source is connected to impedance resonance
Matching network rear end.
Described high frequency power source mainly includes pre-amplifier, tetrode amplifier and high frequency load, pre-amplifier
It is connected by impedance resonance matching network with tetrode amplifier, input signal driving is provided for tetrode, the grid of tetrode is cloudy
Electric capacity Ckg1 connects and composes the input impedance of tetrode amplifier with grid input impedance, is connected with impedance resonance matching network,
The anode output that high frequency loads with tetrode is connected.
Described impedance resonance matching network is the adjustable inductance network turned to by ferrite core, including four iron oxygen
Body is wound with winding on the inductance being made, described ferrite core, and four ferrite cores share 120T magnetic bias line
Circle, by changing the electric current on ferrite core in magnetic bias coil, it is possible to adjust the biased magnetic field strength in ferrite core, make iron
The magnetic conductivity of oxysome ring changes, and the inductance value for causing ferrite core to be constituted with winding changes, therefore can pass through control
Bias current processed adjusts the inductance value of matching network, in being carried out to the off resonance for changing the grid input impedance caused due to frequency
With with compensation, and then realize the automatic resonance matching of grid impedance.
Described control unit mainly includes phase discriminator, controller and magnetic bias power supply, and described phase discriminator is to high frequency
The phase difference of power source pre-amplifier output impedance detected, phase discriminator is located at controller front end, the output of controller with
Magnetic bias power supply is connected, and described controller function is by FPGA programming realizations, to improve the anti-interference energy of control signal remote transmission
Power, uses optical cable digital communication between controller and magnetic bias power supply；Magnetic bias power supply connects with the magnet exciting coil of impedance matching network,
Go to control the output current in bias current source to realize to matching by comparing pre-amplifier input and the phase difference of output signal
Inductance in network is adjusted, and realization is compensated to phase difference.
Described ferrite core each two is that the coil on a pair, the two ferrite cores uses reverse parallel connection coiling, is made
The induced voltage that bias current is produced in inductance coil cancels each other.
6 circle windings are wound with each ferrite core, the number of turns of winding depends on demand of the matching network to inductance value.
Number of turn identical winding is wound with described each ferrite core.
The output current of described magnetic bias power supply determines that scope is between 0 ~ 10A by the tuning range of network.
Described impedance resonance matching network has impedance mapping function, and the big value output impedance of pre-amplifier is converted
For the grid input impedance of small value, it is ensured that the impedance matching between dual-stage amplifier.
Described impedance resonance matching network has 4：1 impedance mapping function, 800 Ω of pre-amplifier are exported and hindered
Resistance is changed to 200 Ω grid input impedances.
Described controller is PID controller.
Described impedance automatic tuning system can be controlled by monitoring the Tune-out angle of pre-amplifier output impedance in real time
The parameter of system adjustment matching network, the impedance variations that automatic compensation tetrode grid capacitance Ckg1 is caused in broadband.
Beneficial effects of the present invention are embodied in：The present invention mainly one is from the impedance-tumed technology of motion tracking, more specifically
The Tune-out angle of monitoring pre-amplifier output impedance in real time is can be by control the parameter of adjustment matching network, automatic compensation
The impedance variations that tetrode grid capacitance Ckg1 is caused in broadband so that can be all the time in the range of whole broadband operation
Ensure that tetrode grid input impedance is in resonance matching status, so as to greatly improve the work of high-power tetrode amplifier
Make efficiency and overall performance.
Brief description of the drawings
Fig. 1 is the logic connection diagram of the present invention.
Fig. 2 is the schematic diagram of middle impedance resonant matching network of the present invention.
Embodiment
The embodiment that the invention will now be described in detail with reference to the accompanying drawings：
As shown in Figure 1-2, a kind of impedance automatic tuning system that can in real time monitor and compensate automatically, described impedance is tuned automatically
System mainly includes control unit and the high frequency power source connected by impedance resonance matching network, and wherein control unit is connected to
Impedance resonance matching network front end, high frequency power source is connected to impedance resonance matching network rear end.
Described high frequency power source mainly includes pre-amplifier, tetrode amplifier and high frequency load, pre-amplifier
It is connected by impedance resonance matching network with tetrode amplifier, input signal driving is provided for tetrode, the grid of tetrode is cloudy
Electric capacity Ckg1 connects and composes the input impedance of tetrode amplifier with grid input impedance, is connected with impedance resonance matching network,
The anode output that high frequency loads with tetrode is connected.
Described impedance resonance matching network is the adjustable inductance network turned to by ferrite core, impedance resonance matching
Network has impedance mapping function, and the big value output impedance of pre-amplifier is transformed into the grid input impedance of small value, it is ensured that
Impedance matching between dual-stage amplifier；Impedance resonance matching network has 4：1 impedance mapping function, by pre-amplifier
800 Ω output impedances are transformed to 200 Ω grid input impedances.
Number of turn identical winding is wound with the inductance turned to including four ferrite cores, described each ferrite core,
And four ferrite cores share and are wound with 6 circle windings, winding on 120T magnetic bias coil, more particularly each ferrite core
The number of turns depend on matching network to the demand of inductance value；Described ferrite core each two is a pair, the two ferrite cores
On coil use reverse parallel connection coiling, the induced voltage that bias current is produced in inductance coil is cancelled each other；By changing
Become the electric current in magnetic bias coil on ferrite core, it is possible to adjust the biased magnetic field strength in ferrite core, make ferrite core
Magnetic conductivity changes, and the inductance value for causing ferrite core to be constituted with winding changes, therefore can be by controlling magnetic bias electricity
Stream adjusts the inductance value of matching network, and the off resonance for changing the grid input impedance caused due to frequency is neutralized and mended
Repay, and then realize the automatic resonance matching of grid impedance.
Described control unit mainly includes phase discriminator, controller and magnetic bias power supply, and described phase discriminator is to high frequency
The phase difference of power source pre-amplifier output impedance is detected that phase discriminator is located at controller front end, and controller is PID control
Device, the output of controller is connected with magnetic bias power supply, and the output current of magnetic bias power supply is determined by the tuning range of network, scope 0 ~
Between 10A；Described controller function is by FPGA programming realizations, to improve the antijamming capability of control signal remote transmission, control
Optical cable digital communication is used between device processed and magnetic bias power supply；Magnetic bias power supply connects with the magnet exciting coil of impedance matching network, passes through
The phase difference for comparing pre-amplifier input and output signal goes to control the output current in bias current source to realize to matching network
In inductance be adjusted, realization phase difference is compensated；Impedance automatic tuning system can be put by monitoring prime in real time
The Tune-out angle of big device output impedance controls to adjust the parameter of matching network, and automatic compensation tetrode grid capacitance Ckg1 is in wideband
The impedance variations caused in band.
The present invention can control to adjust matching network by monitoring the Tune-out angle of pre-amplifier output impedance in real time
Parameter, the impedance variations that automatic compensation tetrode grid capacitance Ckg1 is caused in broadband, specific operation principle is as follows：
First, middle impedance resonant matching network of the present invention uses the adjustable inductance network by ferrite core coiling, passes through
Change the biased magnetic field strength in the electric current in magnetic bias coil on ferrite core, regulation ferrite core, make the magnetic conductance of ferrite core
Rate changes, and the inductance value for causing ferrite core to be constituted with winding changes, thus can by control bias current come
The inductance value of matching network is adjusted, the off resonance for changing the grid input impedance caused due to frequency is neutralized and compensated, is entered
And realize the automatic resonance matching of grid impedance.
Meanwhile, impedance resonance matching network is made up of totally the inductance of two pairs of 4 ferrite core coilings, sees Fig. 2, each iron oxygen
6 circle windings are wound with body ring, the number of turns of winding depends on demand of the matching network to inductance value, and 4 ferrite cores share one
Magnetic bias coil（120T）, the output current of magnetic bias power supply determines by the tuning range of network, and the scope of output current is 0 ~ 10A,
To offset influence of the bias magnetic field to the loop of rf, each two ferrite core is that the coil on a pair, the two rings uses reverse
Coiling in parallel, makes the induced voltage that bias current is produced in inductance coil cancel each other, high-frequency circuit is not impacted.
In order that the impedance matching between pre-amplifier and final stage tetrode amplifier, impedance resonance matching network is except tool
Having also has 4 beyond tuber function：1 impedance mapping function, 800 Ω output impedances of pre-amplifier can be transformed to by it
200 Ω grid input impedance, it is ensured that the impedance matching between dual-stage amplifier.Due to the output load impedance of pre-amplifier
Mainly it is made up of the impedance of the input resistance of tetrode amplifier, tetrode grid-to-cathode capacitance Ckg1 and impedance resonance matching network
, when the input and output voltage same-phase that ensure pre-amplifier, i.e., when phase difference goes to zero, the output resistance of pre-amplifier
Resist for pure resistance, at this moment the grid of electron tube is at optimal tuning state.
Once because frequency change or other situations cause tetrode grid-to-cathode capacitance Ckg1 input impedance to change, make
Into electron tube grid impedance off resonance when, a phase difference will be produced between the input of pre-amplifier and output voltage, by
Phase discriminator detection pre-amplifier input and the phase difference of output signal, go to control bias current after the processing of PID controller
The output current in source, controller removes this phase signal detected according to phase discriminator to control the bias current of ferrite core,
Because magnetic bias power supply is connected with the magnet exciting coil of impedance resonance matching network, the change of electric current will match impedance resonance in coil
Inductance in network changes, so as to be compensated to the capacitive reactance component in impedance, promotes phase difference to go to zero, it is ensured that level Four
The function for the controller that tube grid input impedance is in resonant condition, i.e., pure resistance state, the present invention all the time is programmed real by FPGA
It is existing, to improve the antijamming capability of control signal remote transmission, optical cable digital communication is used between controller and magnetic bias power supply；From
And the operating efficiency and overall performance of high-power tetrode amplifier can be greatly improved.
To sum up, the present invention more specifically can be by before monitoring in real time as one from the impedance-tumed technology of motion tracking
The Tune-out angle of level amplifier output impedance controls to adjust the parameter of matching network, and automatic compensation tetrode grid capacitance Ckg1 exists
The impedance variations caused in broadband so that can be always ensured that tetrode amplifier is inputted in the range of whole broadband operation
Impedance is in resonance matching status, so as to greatly improve the operating efficiency and overall performance of high-power tetrode amplifier.
It is described above, only it is presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention, one's own profession
The technical staff of industry, under the inspiration of the technical program, can make some deformations and modification, every technology according to the present invention
Any modification, equivalent variations and modification that embodiment of the essence to more than is made, still fall within the scope of technical solution of the present invention
It is interior.
Claims (9)
1. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically, it is characterised in that：Described impedance is adjusted automatically
Humorous system mainly includes control unit and the high frequency power source connected by impedance resonance matching network, and wherein control unit is connected
In impedance resonance matching network front end, high frequency power source is connected to impedance resonance matching network rear end；
Described high frequency power source mainly includes pre-amplifier, tetrode amplifier and high frequency load, and pre-amplifier passes through
Impedance resonance matching network is connected with tetrode amplifier, and input signal driving, the grid-to-cathode capacitance of tetrode are provided for tetrode
Ckg1 connects and composes the input impedance of tetrode amplifier with grid input impedance, is connected with impedance resonance matching network, high frequency
The anode output with tetrode is loaded to be connected；
Described impedance resonance matching network is the adjustable inductance network turned to by ferrite core, including four ferrite cores
Winding is wound with the inductance turned to, described ferrite core, and four ferrite cores share 120T magnetic bias coil, lead to
Cross the electric current in magnetic bias coil on change ferrite core, it is possible to adjust the biased magnetic field strength in ferrite core, make ferrite
The magnetic conductivity of ring changes, and the inductance value for causing ferrite core to be constituted with winding changes, therefore can be inclined by control
Magnetoelectricity stream adjusts the inductance value of matching network, the off resonance for changing the grid input impedance caused due to frequency neutralize with
Compensation, and then realize the automatic resonance matching of grid impedance；
Described control unit mainly includes phase discriminator, controller and magnetic bias power supply, and described phase discriminator is to high frequency power
The phase difference of source pre-amplifier output impedance is detected that phase discriminator is located at controller front end, the output of controller and magnetic bias
Power supply is connected, and described controller function is by FPGA programming realizations, to improve the antijamming capability of control signal remote transmission, control
Optical cable digital communication is used between device processed and magnetic bias power supply；Magnetic bias power supply connects with the magnet exciting coil of impedance matching network, passes through
The phase difference for comparing pre-amplifier input and output signal goes to control the output current in bias current source to realize to matching network
In inductance be adjusted, realization phase difference is compensated.
2. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 1, its feature exists
In：Described ferrite core each two is that the coil on a pair, the two ferrite cores uses reverse parallel connection coiling, makes magnetic bias electricity
The induced voltage produced in inductance coil is flowed to cancel each other.
3. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 1, its feature exists
In：6 circle windings are wound with each ferrite core, the number of turns of winding depends on demand of the matching network to inductance value.
4. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim any one of 1-3,
It is characterized in that：Number of turn identical winding is wound with described each ferrite core.
5. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 1, its feature exists
In：The output current of described magnetic bias power supply determines that scope is between 0 ~ 10A by the tuning range of network.
6. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 1, its feature exists
In：Described impedance resonance matching network has impedance mapping function, the big value output impedance of pre-amplifier is transformed to small
The grid input impedance of value, it is ensured that the impedance matching between dual-stage amplifier.
7. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 6, its feature exists
In：Described impedance resonance matching network has 4：1 impedance mapping function, 800 Ω output impedances of pre-amplifier are become
It is changed to 200 Ω grid input impedances.
8. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to claim 1, its feature exists
In：Described controller is PID controller.
9. a kind of impedance automatic tuning system that can in real time monitor and compensate automatically according to any one of right 1,6,7, its
It is characterised by：Described impedance automatic tuning system can be controlled by monitoring the Tune-out angle of pre-amplifier output impedance in real time
The parameter of system adjustment matching network, the impedance variations that automatic compensation tetrode grid capacitance Ckg1 is caused in broadband.
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| CN110798155A (en) * | 2019-10-29 | 2020-02-14 | 电子科技大学 | Power amplifier AM-PM distortion correction circuit and method |
| CN112865719A (en) * | 2020-12-31 | 2021-05-28 | 散裂中子源科学中心 | Radio frequency power source system and device for boron neutron capture treatment device |
| CN113064109A (en) * | 2021-03-24 | 2021-07-02 | 中国科学院近代物理研究所 | Ferrite high-frequency loading cavity bias curve testing device and method |
| CN114709025A (en) * | 2022-03-29 | 2022-07-05 | 中铁电气化局集团有限公司 | Rail transit information transmission cable shielding protection method and system |
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| CN107294503B (en) | 2020-09-25 |
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