CN111769805B - Automatic frequency tracking device for radio frequency power source - Google Patents
Automatic frequency tracking device for radio frequency power source Download PDFInfo
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- CN111769805B CN111769805B CN202010573682.0A CN202010573682A CN111769805B CN 111769805 B CN111769805 B CN 111769805B CN 202010573682 A CN202010573682 A CN 202010573682A CN 111769805 B CN111769805 B CN 111769805B
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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
Abstract
The invention discloses a radio frequency power source automatic frequency tracking device which comprises a low-level control system, wherein the low-level control system comprises a first acquisition and demodulation module, a second acquisition and demodulation module, a third acquisition and demodulation module, a first separation module, a second separation module, a digital phase discriminator, a PID (proportion integration differentiation) controller, a baseband digital frequency shift module and a modulation and conversion module. The invention adopts a digital implementation mode, introduces a PID control algorithm, and realizes automatic tracking calculation of cavity frequency and self-adaptive conversion of signal source output frequency. In the conversion process, the working frequency of the radio frequency source is not required to be controlled, and the radio frequency signal output by the signal source is directly regulated, so that the response time of the system can be shortened.
Description
Technical Field
The invention relates to the field of radio frequency communication equipment, in particular to a radio frequency power source automatic frequency tracking device.
Background
The radio frequency power source is a high-power signal amplifying unit for providing radio frequency source power for various medical equipment for radiation and particle acceleration systems, the output radio frequency signal is generally added to the high-frequency resonant cavity, and the output power is generally from tens of kilowatts to thousands of kilowatts. In order to realize the controllability of the radio frequency signal, a low-level control system is generally adopted, as shown in fig. 1, after the low-level control system collects and demodulates the amplified radio frequency signal and the working frequency signal of the resonant cavity, the variable quantity of the cavity frequency is calculated, so that the working frequency of the signal source is set or changed, and the frequency of the output radio frequency signal is exactly the resonant frequency of the resonant cavity, but because the resonant frequency of the resonant cavity changes in the working process, a longer response time is required by utilizing a mode of changing the working frequency of the signal source.
Disclosure of Invention
The invention aims to provide an automatic frequency tracking device for a radio frequency power source, which can enable the frequency of a radio frequency signal to be always equal to the resonance frequency of a high-frequency resonant cavity and shorten the response time of a system.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the low-level control system comprises a first acquisition demodulation module, a second acquisition demodulation module, a third acquisition demodulation module, a first separation module, a second separation module, a digital phase discriminator, a PID controller, a baseband digital frequency shift module and a modulation conversion module;
the first acquisition demodulation module performs analog-to-digital sampling on the radio frequency signal output by the signal source, and performs digital down-conversion demodulation on the digital signal to output a first path of digital baseband signal;
the second acquisition demodulation module performs analog-to-digital sampling on the amplified radio frequency signals, and performs digital down-conversion demodulation on the digital signals to output a second path of digital baseband signals;
the third acquisition demodulation module performs analog-to-digital sampling on the working frequency signal of the high-frequency resonant cavity, and performs digital down-conversion demodulation on the digital signal to output a third path of digital baseband signal;
the input end of the first separation module is connected with the output end of the second acquisition demodulation module, and after the second path of digital baseband signals are subjected to amplitude-phase separation, phase signals are input into the digital phase discriminator;
the input end of the second separation module is connected with the output end of the third acquisition demodulation module, and after the third digital baseband signal is subjected to amplitude-phase separation, the phase signal is input into the digital phase discriminator;
the digital phase discriminator calculates the phase difference of the two paths of input phase signals and inputs the phase difference into the PID controller, and the PID controller calculates a phase accumulation word corresponding to the current high-frequency resonant cavity working frequency variation according to the magnitude and the positive and negative of the phase difference;
the input end of the baseband digital frequency shift module is connected with the output end of the PID controller, and frequency shifting in a digital domain is carried out on the digital baseband of the first path of digital baseband signals according to the phase accumulation word;
the input end of the modulation conversion module is connected with the output end of the baseband digital frequency shift module, and after up-conversion and digital-to-analog conversion are carried out on the first path of digital baseband signals subjected to frequency shifting, the radio frequency signals with the frequency equal to the resonant frequency of the high-frequency resonant cavity are output.
The beneficial effects of the invention are as follows: the radio frequency power source automatic frequency tracking device adopts a digital implementation mode, and introduces a PID control algorithm, so that automatic tracking calculation of cavity frequency and self-adaptive conversion of signal source output frequency are realized. In the conversion process, the working frequency of the radio frequency source is not required to be controlled, and the radio frequency signal output by the signal source is directly regulated, so that the response time of the system can be shortened.
Drawings
FIG. 1 is a schematic diagram illustrating the operation of a conventional low level control system;
fig. 2 is a schematic structural view of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The automatic frequency tracking device of the radio frequency power source comprises a low-level control system, as shown in fig. 2, wherein the low-level control system comprises a first acquisition and demodulation module, a second acquisition and demodulation module, a third acquisition and demodulation module, a first separation module, a second separation module, a digital phase discriminator, a PID controller, a baseband digital frequency shift module and a modulation and conversion module;
the first acquisition demodulation module performs analog-to-digital sampling on the radio frequency signal output by the signal source, and performs digital down-conversion demodulation on the digital signal to output a first path of digital baseband signal;
the second acquisition demodulation module performs analog-to-digital sampling on the amplified radio frequency signals, and performs digital down-conversion demodulation on the digital signals to output a second path of digital baseband signals;
the third acquisition demodulation module performs analog-to-digital sampling on the working frequency signal of the high-frequency resonant cavity, and performs digital down-conversion demodulation on the digital signal to output a third path of digital baseband signal;
the input end of the first separation module is connected with the output end of the second acquisition demodulation module, and after the second path of digital baseband signals are subjected to amplitude-phase separation, phase signals are input into the digital phase discriminator;
the input end of the second separation module is connected with the output end of the third acquisition demodulation module, and after the third digital baseband signal is subjected to amplitude-phase separation, the phase signal is input into the digital phase discriminator;
the digital phase discriminator calculates the phase difference of the two paths of input phase signals and inputs the phase difference into the PID controller, and the PID controller calculates a phase accumulation word corresponding to the current high-frequency resonant cavity working frequency variation according to the magnitude and the positive and negative of the phase difference;
the input end of the baseband digital frequency shift module is connected with the output end of the PID controller, and frequency shifting in a digital domain is carried out on the digital baseband of the first path of digital baseband signals according to the phase accumulation word;
the input end of the modulation conversion module is connected with the output end of the baseband digital frequency shift module, and after up-conversion and digital-to-analog conversion are carried out on the first path of digital baseband signals subjected to frequency shifting, the radio frequency signals with the frequency equal to the resonant frequency of the high-frequency resonant cavity are output.
The radio frequency power source automatic frequency tracking device adopts a digital implementation mode, and introduces a PID control algorithm, so that automatic tracking calculation of cavity frequency and self-adaptive conversion of signal source output frequency are realized. In the conversion process, the working frequency of the radio frequency source is not required to be controlled, and the radio frequency signal output by the signal source is directly regulated, so that the response time of the system can be shortened.
The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Claims (1)
1. The automatic frequency tracking device of the radio frequency power source comprises a low-level control system, and is characterized in that the low-level control system comprises a first acquisition demodulation module, a second acquisition demodulation module, a third acquisition demodulation module, a first separation module, a second separation module, a digital phase discriminator, a PID controller, a baseband digital frequency shift module and a modulation conversion module;
the first acquisition demodulation module performs analog-to-digital sampling on the radio frequency signal output by the signal source, and performs digital down-conversion demodulation on the digital signal to output a first path of digital baseband signal;
the second acquisition demodulation module performs analog-to-digital sampling on the amplified radio frequency signals, and performs digital down-conversion demodulation on the digital signals to output a second path of digital baseband signals;
the third acquisition demodulation module performs analog-to-digital sampling on the working frequency signal of the high-frequency resonant cavity, and performs digital down-conversion demodulation on the digital signal to output a third path of digital baseband signal;
the input end of the first separation module is connected with the output end of the second acquisition demodulation module, and after the second path of digital baseband signals are subjected to amplitude-phase separation, phase signals are input into the digital phase discriminator;
the input end of the second separation module is connected with the output end of the third acquisition demodulation module, and after the third digital baseband signal is subjected to amplitude-phase separation, the phase signal is input into the digital phase discriminator;
the digital phase discriminator calculates the phase difference of the two paths of input phase signals and inputs the phase difference into the PID controller, and the PID controller calculates a phase accumulation word corresponding to the current high-frequency resonant cavity working frequency variation according to the magnitude and the positive and negative of the phase difference;
the input end of the baseband digital frequency shift module is connected with the output end of the PID controller, and frequency shifting in a digital domain is carried out on the digital baseband of the first path of digital baseband signals according to the phase accumulation word;
the input end of the modulation conversion module is connected with the output end of the baseband digital frequency shift module, and after up-conversion and digital-to-analog conversion are carried out on the first path of digital baseband signals subjected to frequency shifting, the radio frequency signals with the frequency equal to the resonant frequency of the high-frequency resonant cavity are output.
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| CN110134005A (en) * | 2019-05-28 | 2019-08-16 | 重庆大学 | A kind of multiplex control system of electromagnetic type raster micro mirror |
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| TWI246264B (en) * | 2004-09-23 | 2005-12-21 | Realtek Semiconductor Corp | Digital frequency hopping transceiver and method thereof |
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| EP2031791A1 (en) * | 2007-08-30 | 2009-03-04 | Deutsche Thomson OHG | Apparatus and method for recovering data from a clocked input signal |
| CN101478317A (en) * | 2008-12-25 | 2009-07-08 | 上海全波通信技术有限公司 | IQ amplitude adaptive balance system in direct frequency conversion modulation |
| CN101800395A (en) * | 2010-03-04 | 2010-08-11 | 浙江大学 | Digitalized laser phase-locking device and phase-locking method |
| CN101883469A (en) * | 2010-03-15 | 2010-11-10 | 中国原子能科学研究院 | Method and device for eliminating amplitude-phase control crosstalk in self-excitation mode |
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