Automatic impedance-tuning system capable of realizing real-time monitoring and automatic compensation

Abstract

The invention relates to the technical field of automatic tuning of impedance of wide-band high-power radio-frequency amplifiers, in particular to an automatic impedance-tuning system capable of realizing real-time monitoring and automatic compensation, which can be applied to wide-band high-power source to realize automatic compensation by monitoring the detuning angle of the output impedance of the front amplifier to control and adjust parameters of the matching network so as to overcome the front impedance detuning of tetrodes. The automatic tuning system mainly comprises a control unit and a high-frequency power source which are connected through the impedance and resonance matching network. The automatic impedance-tuning system mainly refers to the automatic-tracking impedance tuning technique; to be specific, according to the technique, the parameters of the matching network can be controlled and adjusted by monitoring the detuning angle of the output impedance of the front amplifier in real time, so that impedance change, caused in the wide band, of the grid capacitor Ckg1 of the tetrode can be compensated automatically, the input impedance of the grid of the tetrode is kept in the resonance matching state within the working range of the whole wide band; therefore, work efficiency and integral performance of the high-power tetrode amplifier can be improved greatly.

Description

technical field [0001] The invention relates to the technical field of automatic tuning of the impedance of a broadband high-power radio frequency amplifier, in particular to an automatic compensation function that can be applied to a broadband high-frequency power source by monitoring the detuning angle of the output impedance of the pre-amplifier in real time to control and adjust the parameters of the matching network. An impedance auto-tuning system capable of real-time monitoring and auto-compensation to solve the impedance detuning of the tetrode front stage. Background technique [0002] In the fields of high-frequency power sources of certain particle accelerators and high-power short-wave transmitters for microwave communications, or in the field of proton and heavy ion accelerators in the field of basic scientific experimental research, as well as space radiation effects and accelerator-driven clean nuclear energy devices, high frequency and high power are required....

AI Technical Summary

Problems solved by technology

[0002] In the fields of high-frequency power sources of certain particle accelerators and high-power short-wave transmitters for microwave communications, or in the field of proton and heavy ion accelerators in the field of basic scientific experimental research, as well as space radiation effects and accelerator-driven clean nuclear energy devices, high frequency and high power are required. Electronic tetrode amplifiers work in a wide frequency range. For example, ferrite-loaded high-frequency accelerating cavities used in proton and heavy ion synchrotrons and medical accelerator cancer treatment devices require high-frequency power sources to have In order to ensure the normal and reliable operation of the high frequency power source in the wide frequency band, the impedance matching of all levels of the power amplifier is very important. Due to the existence of the grid cathode capacitance Ckg1 of the tetrode, when the frequency sweep is working The input impedance of the gate will change with the frequency, causing the impedance detuning of the front stage of the tetrode, which will increase the reflected power of the preamplifier, affect the power output of the power source, and cause the overall performance of the power source to deteriorate; in order to compensate for the For detuning caused by this, the usual technique is to install a passive impedance matching network between the preamplifier and the tetrode amplifier, which is feasible for power amplifiers with narrowband operating frequencies, but due to the Due to device bandwidth limitations, non-adjustable impedance matching networks cannot meet the requirements of broadband matching, so they are not suitable for amplifiers that work in a wide frequency band

Although the Chinese patent number is 201410300942.1, the patent name is a method for tuning a broadband high-power radio frequency transmitter, which discloses a tuning method for a broadband high-power radio frequency transmitter, which involves an automatic tuning technology, that is When the power radio frequency transmitter is running in short pulses, the data acquisition system is used to monitor the working status of the electronic tube amplifiers at all levels of the transmitter, and the parameters of the electronic tubes collected are analyzed to feedback and adjust the tuning components of the transmitter, so that the electronic tube amplifiers of the transmitter can achieve the best performance. Working status and maximum power output. Although this method can scientifically and accurately reflect the working status of the transmitter tube amplifier in the form of data charts, it cannot perform real-time monitoring and impedance automatic tuning.

Images