CN112003610A - Control device and method based on automatic frequency control module and radiotherapy equipment - Google Patents

Control device and method based on automatic frequency control module and radiotherapy equipment Download PDF

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Publication number
CN112003610A
CN112003610A CN202010811457.6A CN202010811457A CN112003610A CN 112003610 A CN112003610 A CN 112003610A CN 202010811457 A CN202010811457 A CN 202010811457A CN 112003610 A CN112003610 A CN 112003610A
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signal
module
phase
phase shifter
frequency
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CN202010811457.6A
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CN112003610B (en
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刘世豪
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Shanghai United Imaging Healthcare Co Ltd
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Shanghai United Imaging Healthcare Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
    • H03L7/0812—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used
    • H03L7/0816—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used the controlled phase shifter and the frequency- or phase-detection arrangement being connected to a common input
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
    • H03L7/0812—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used
    • H03L7/0818—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used the controlled phase shifter comprising coarse and fine delay or phase-shifting means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop

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Abstract

The application provides a control device and a control method of an automatic frequency control module and radiotherapy equipment. The control device comprises a first acquisition circuit, a second acquisition circuit, an AFC module and a control module. The first acquisition circuit is used for acquiring a first signal output by the signal source. The second acquisition circuit is used for acquiring a second signal reflected by the load. The AFC module is electrically connected with the first acquisition circuit and the second acquisition circuit respectively. The AFC module is used for converting the first signal into a first amplitude signal. The AFC module is used for converting the second signal into a second amplitude signal. The control module is respectively and electrically connected with the first acquisition circuit, the second acquisition circuit and the AFC module. The control module adjusts the first signal output by the signal source based on the best matching frequency. The control module is further configured to adjust a phase of a phase shifter in the AFC module according to the first amplitude signal and the second amplitude signal, so that a phase of the phase shifter at a position corresponding to the best matching frequency is zero.

Description

Control device and method based on automatic frequency control module and radiotherapy equipment
Technical Field
The application relates to the technical field of automatic frequency control, in particular to a control device and a method based on an automatic frequency control module and radiotherapy equipment.
Background
Automatic Frequency Control (AFC) is an Automatic Control module that maintains the Frequency of a microwave signal output from a microwave generating source in a certain relationship with a target Frequency. At present, the automatic frequency control module is widely applied to microwave control devices of radars, communication, irradiation and medical accelerators.
AFC modules often require adjusting the phase shifter after installation into the system to operate at the optimum operating point. Currently, manual adjustment is mainly used for phase shifter adjustment in AFC modules. The process of manually adjusting the AFC phase shifter is complicated, the matching frequency needs to be searched each time, the phase shifter is moved for multiple times according to a difference signal of a matching frequency point, the matching frequency can float along with power feeding, and the control precision is poor.
Disclosure of Invention
Therefore, it is necessary to provide a control device and method based on an automatic frequency control module, and a radiotherapy apparatus, for solving the problem of poor control accuracy of the conventional AFC module due to the fact that the optimal working phase is found by manually adjusting the phase shifter.
An automatic frequency control module-based control device, comprising:
the first end of the first acquisition circuit is used for being electrically connected with a signal source, the second end of the first acquisition circuit is used for being electrically connected with a load, and the first acquisition circuit is used for acquiring a first signal output by the signal source;
the first end of the second acquisition circuit is electrically connected with the load, and the second acquisition circuit is used for acquiring a second signal reflected by the load;
the AFC module is respectively electrically connected with the first acquisition circuit and the second acquisition circuit, and is used for converting the first signal into a first amplitude signal and converting the second signal into a second amplitude signal; and
and the control module is electrically connected with the AFC module and used for adjusting the first signal output by the signal source based on a best matching frequency and adjusting the phase of a phase shifter in the AFC module according to the first amplitude signal and the second amplitude signal so as to enable the phase of the phase shifter at the position corresponding to the best matching frequency to be zero.
A control method based on an automatic frequency control module comprises the following steps:
receiving a first signal output by a signal source and a second signal reflected by a load;
adjusting the first signal output by the signal source based on a best matching frequency;
converting the first signal into a first amplitude signal through an AFC module, and converting the second signal into a second amplitude signal through the AFC module;
and adjusting the phase of a phase shifter in the AFC module according to the first amplitude signal and the second amplitude signal so as to enable the phase of the phase shifter at the position corresponding to the optimal matching frequency to be zero.
A radiotherapy apparatus comprising: the control device based on the automatic frequency control module according to any one of the above embodiments; and
and the load is electrically connected with the second end of the first acquisition circuit and the first end of the second acquisition circuit respectively.
Compared with the prior art, the control device and method based on the automatic frequency control module and the radiotherapy equipment acquire the first signal output by the signal source through the first acquisition circuit. And collecting a second signal reflected by the load through the second collecting circuit. And converting the first signal into a first amplitude signal and converting the second signal into a second amplitude signal through the AFC module. Adjusting, by a control module, the first signal output by the signal source based on the best matching frequency. Meanwhile, the phase of the phase shifter in the AFC module is adjusted by the control module according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter at the position corresponding to the optimal matching frequency is zero, the automatic adjustment of the phase shifter is realized, the AFC module works at the optimal working point, the control precision is improved, and the advantage of simple operation is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a control apparatus based on an automatic frequency control module according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second signal varying with frequency according to an embodiment of the present application;
FIG. 3 is a diagram illustrating a phase of a phase shifter according to an embodiment of the present invention;
fig. 4 is a block diagram of a control device based on an afc module according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a control device based on an afc module according to another embodiment of the present application;
fig. 6 is a block diagram of an AFC module according to an embodiment of the present application;
FIG. 7 is a graph of amplitude signal versus frequency for a detection response curve according to an embodiment of the present disclosure;
FIG. 8 is a graph of a difference signal versus frequency according to an embodiment of the present disclosure;
FIG. 9 is a graph of amplitude signal versus frequency for a detection response curve according to another embodiment of the present application;
FIG. 10 is a graph of a difference signal versus frequency according to an embodiment of the present application;
fig. 11 is a schematic block diagram of a control apparatus based on an automatic frequency control module according to another embodiment of the present application;
fig. 12 is a flowchart of a control method based on an afc module according to an embodiment of the present application;
fig. 13 is a block diagram of a radiation therapy device according to an embodiment of the present application.
Description of reference numerals:
10. a control device based on an automatic frequency control module; 101. a signal source; 102. a load; 100. a first acquisition circuit; 20. a radiotherapy apparatus; 200. a second acquisition circuit; 300. an AFC module; 310. a phase shifter; 320. a coupler; 330. a frequency response detector; 400. a control module; 410. a judgment unit; 420. a frequency control unit; 430. a phase shifter control unit; 431. a comparator; 432. a controller; 500. an isolator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a control device 10 based on an automatic frequency control module. The automatic frequency control module based control device 10 includes: a first acquisition circuit 100, a second acquisition circuit 200, an AFC module 300, and a control module 400. The first end of the first acquisition circuit 100 is used for electrically connecting with a signal source 101. The second terminal of the first acquisition circuit 100 is configured to be electrically connected to a load 102. The first acquisition circuit 100 is configured to acquire a first signal output by the signal source 101. A first terminal of the second acquisition circuit 200 is configured to be electrically connected to the load 102. The second acquisition circuit 200 is configured to acquire a second signal reflected by the load 102. The AFC module 300 is electrically connected to the first acquisition circuit 100 and the second acquisition circuit 200, respectively. The AFC module 300 is configured to convert the first signal into a first amplitude signal. The AFC module 300 is configured to convert the second signal into a second amplitude signal.
The control module 400 is electrically connected to the AFC module 300. The control module 400 is configured to adjust the first signal output by the signal source 101 based on the best matching frequency. The control module 400 is further configured to adjust the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter 310 corresponding to the best matching frequency is zero.
It is understood that the specific circuit topology of the first acquisition circuit 100 is not limited as long as the first acquisition circuit has the function of acquiring the first signal output by the signal source 101. In one embodiment, the first acquisition circuit 100 may be a directional coupler. In one embodiment, the first acquisition circuit 100 may also be a power harvester. In one embodiment, the signal source 101 may be a power signal source. In one embodiment, the first signal collected by the first collection circuit 100 is a power signal.
It is understood that the specific circuit topology of the second acquisition circuit 200 is not limited as long as it has the function of acquiring the second signal output by the load 102. In one embodiment, the second acquisition circuit 200 may be a directional coupler. In one embodiment, the second acquisition circuit 200 may also be a power harvester. In one embodiment, the second signal collected by the second collecting circuit 200 is a power signal. In one embodiment, the load 102 may be an electron linac.
It is to be understood that the specific structure of the AFC module 300 is not limited, and only has the functions of converting the first signal into the first amplitude signal and converting the second signal into the second amplitude signal. In one embodiment, the AFC module 300 may include a phase shifter, a filter, a 3dB coupler, and a detector. In one embodiment, the AFC module 300 may also include a phase shifter, a delay line, a coupler, and a detector. In one embodiment, the AFC module 300 may also employ a conventional chip having the function of converting a frequency signal to an amplitude signal.
In one embodiment, the control module 400 may determine a best match frequency based on the first signal and the second signal. Specifically, the control module 400 may determine the best matching frequency according to a ratio of the second signal to the first signal. As shown in fig. 2, the second signal and the first signal vary with frequency, and when a ratio (infinitely close to zero, but not equal to zero) of the second signal to the first signal is minimum at a certain frequency point, it can be determined that the current frequency point is the best matching frequency.
After determining the best matching frequency, the control module 400 may adjust the first signal output by the signal source 101 based on the best matching frequency. Specifically, the control module 400 may first adjust the first signal output by the signal source 101 according to the best matching frequency. I.e. the signal source 101 is controlled to output the first signal according to the best matching frequency. In one embodiment, the control module 400 adjusts the control process of the first signal output by the signal source 101 according to the best matching frequency, and may adjust the first signal output by the signal source 101 in an automatic mode. Specifically, after the control module 400 determines the optimal matching frequency, the driving signal corresponding to the optimal matching frequency may be directly output to the signal source 101. The signal source 101 is responsive to the best match frequency and outputs the first signal at the best match frequency. This allows for automatic adjustment of the signal source 101 based on the best matching frequency.
In one embodiment, the first signal output by the signal source 101 may also be adjusted in a manual mode. Specifically, after the control module 400 determines the best matching frequency, a technician may manually adjust the signal source 101 according to the best matching frequency, so that the signal source 101 outputs the first signal according to the best matching frequency. Manual adjustment of the signal source 101 may thus be achieved based on the best matching frequency.
After the first signal output by the signal source 101 is adjusted based on the best matching frequency, the control module 400 may adjust the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal. Specifically, the control module 400 may obtain a difference signal by subtracting the first amplitude signal and the second amplitude signal. If the difference signal is a non-zero signal, the control module 400 adjusts the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero.
In one embodiment, if the difference signal is a non-zero signal, it means: the difference signal corresponds to a value greater than zero or less than zero. As shown in fig. 3, when the value corresponding to the difference signal is greater than zero, the phase of the corresponding phase shifter 310 is less than zero, and the phase of the phase shifter 310 may be increased by the control module 400 so that the phase of the phase shifter 310 is equal to zero. Conversely, when the value corresponding to the difference signal is smaller than zero, the phase of the corresponding phase shifter 310 is larger than zero, and the phase of the phase shifter 310 may be decreased by the control module 400, so that the phase of the phase shifter 310 is equal to zero. As can be seen from the above, if the difference signal is a non-zero signal, the control module 400 may adjust the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, thereby implementing automatic adjustment of the phase shifter 310, enabling the AFC module to operate at the best operating point, and further improving the control accuracy.
In one embodiment, if the difference signal is a zero signal, the control module 400 does not adjust the phase of the phase shifter 310. I.e. when the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero. When the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, the control module 400 may lock the current phase of the phase shifter 310. Meanwhile, the first signal output by the signal source 101 is adjusted according to the first amplitude signal and the second amplitude signal output by the AFC module 300, so that the first signal output by the signal source 101 automatically changes along with the load 102, thereby improving the control accuracy.
In this embodiment, the first acquisition circuit 100 acquires a first signal output by the signal source 101. The second signal reflected by the load 102 is collected by the second collecting circuit 200. The first signal is converted into a first amplitude signal and the second signal is converted into a second amplitude signal by the AFC module 300. Adjusting the first signal output by the signal source 101 according to the best matching frequency through a control module 400. Meanwhile, the phase of the phase shifter 310 in the AFC module 300 is adjusted by the control module 102 according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter 310 at the position corresponding to the optimal matching frequency is zero, thereby realizing automatic adjustment of the phase shifter 310, and enabling the AFC module 300 to work at the optimal working point, which not only improves the control precision, but also has the advantage of simple operation.
Referring to fig. 4, in one embodiment, the control module 400 includes: a judging unit 410, a frequency control unit 420, and a phase shifter control unit 430. The judging unit 410 is configured to determine the best matching frequency according to the first signal and the second signal. The frequency control unit 420 is electrically connected to the determination unit 410 and the AFC module 300, respectively. The frequency control unit 420 is configured to adjust the first signal output by the signal source 101 according to the best matching frequency. The phase shifter control unit 430 is electrically connected to the AFC module 300. The phase shifter control unit 430 is configured to perform a difference between the first amplitude signal and the second amplitude signal to obtain a difference signal. If the difference signal is a non-zero signal, the phase shifter control unit 430 adjusts the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero.
In one embodiment, the determining unit 410 may be a control chip. And determining the optimal matching frequency according to the first signal and the second signal through a control chip. The specific determination method can be described with reference to the above embodiments, and is not described herein again. After the determining unit 410 determines the best matching frequency, the best matching frequency is sent to the frequency control unit 420.
In one embodiment, the frequency control unit 420 may be a drive controller. After receiving the best matching frequency, the driving controller may output a driving signal to the signal source 101 based on the best matching frequency. The signal source 101 is responsive to the best match frequency and outputs the first signal at the best match frequency. In one embodiment, the frequency control unit 420 may also output a driving signal to a frequency adjusting unit (e.g., a power device such as a driving motor), and the frequency adjusting unit adjusts the first signal 101 output by the signal source. That is, the frequency control unit 420 may adjust the first signal 101 output by the signal source, so as to facilitate the subsequent adjustment of the phase shifter 310.
In one embodiment, the phase shifter control unit 430 may be a control chip. After the adjustment of the first signal output by the signal source 101 based on the best matching frequency is completed, the phase shifter control unit 430 may perform a difference between the first amplitude signal and the second amplitude signal to obtain a difference signal. If the difference signal is a non-zero signal, the phase shifter control unit 430 adjusts the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero.
In one embodiment, if the difference signal is a non-zero signal, it means: the difference signal corresponds to a value greater than zero or less than zero. When the value corresponding to the difference signal is greater than zero, the phase of the corresponding phase shifter 310 is less than zero, and the phase of the phase shifter 310 may be increased by the phase shifter control unit 430 so that the phase of the phase shifter 310 is equal to zero. Conversely, when the value corresponding to the difference signal is smaller than zero, the phase of the corresponding phase shifter 310 is larger than zero, and the phase of the phase shifter 310 can be reduced by the phase shifter control unit 430, so that the phase of the phase shifter 310 is equal to zero. As can be seen from the above, if the difference signal is a non-zero signal, the phase shifter control unit 430 may adjust the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, thereby achieving automatic adjustment of the phase shifter 310, enabling the AFC module to operate at the best operating point, and further improving the control accuracy.
In one embodiment, if the difference signal is a zero signal, the phase shifter control unit 430 does not adjust the phase of the phase shifter 310. I.e. when the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero. That is to say, the phase shifter 310 can dynamically adjust the phase of the phase shifter 310 by using the above control method, so that the AFC module operates at the optimal operating point, thereby improving the control accuracy.
Referring to fig. 5, in one embodiment, the phase shifter control unit 430 includes: a comparator 431 and a controller 432. The comparator 431 is electrically connected to the AFC module 300. The comparator 431 is configured to perform a difference between the first amplitude signal and the second amplitude signal to obtain a difference signal. The controller 432 is electrically connected to the comparator 431 and the AFC module 300, respectively. If the difference signal is a non-zero signal, the controller 432 adjusts the phase of the phase shifter 310 in the AFC module 300 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero.
In one embodiment, the first amplitude signal and the second amplitude signal may be subtracted by the comparator 431 to obtain a difference signal. The comparator 431 sends the difference signal to the controller 432. After receiving the difference signal, the controller 432 may determine whether the difference signal is a zero signal. If the difference signal is a non-zero signal, the controller 432 adjusts the phase of the phase shifter 310 in the AFC module 300 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero. On the contrary, if the difference signal is a zero signal, the controller 432 does not adjust the phase of the phase shifter 310. For the adjustment of the phase shifter 310, reference may be made to the manner described in the above embodiments, and details are not repeated here. In one embodiment, the comparator 431 may be replaced with a differential amplifier.
In one embodiment, the automatic frequency control module based control device 10 further comprises: the isolator 500. A first end of the isolator 500 is electrically connected to a second end of the first acquisition circuit 100. A second end of the isolator 500 is adapted to be electrically connected to the load 102. By disposing the isolator 500 between the load 102 and the first acquisition circuit 100, the second signal reflected by the load 102 can be prevented from being reversely input to the first acquisition circuit 100 to damage the circuit.
Referring to fig. 6, in one embodiment, the AFC module 300 includes: phase shifter 310, coupler 320, first frequency response detector 330, and second frequency response detector 340. A first end of the phase shifter 310 is electrically connected to the first acquisition circuit 100 for receiving the first signal. A first end of the coupler 320 is electrically connected to a second end of the phase shifter 310. A second end of the coupler 320 is electrically connected to the second acquisition circuit 200. The coupler 320 is configured to convert the first signal into a first high frequency amplitude signal. The coupler 320 is further configured to convert the second signal into a second high frequency amplitude signal.
The first frequency response detector 330 is electrically connected to the coupler 320 and the control module 400, respectively. The first frequency response detector 330 is configured to convert the first high frequency amplitude signal into the first amplitude signal and output the first amplitude signal to the control module 400. The second frequency response detector 340 is electrically connected to the coupler 320 and the control module 400, respectively. The second frequency response detector 340 is configured to convert the second high frequency amplitude signal into the second amplitude signal, and output the second amplitude signal to the control module 400.
In one embodiment, the first end of the phase shifter 310 is configured to receive the first signal, and the second end of the coupler 320 is configured to receive the second signal. In one embodiment, the first end of the phase shifter 310 electrically connected to the first acquisition circuit 100 may be replaced by: a first end of the phase shifter 310 may be electrically connected to the second acquisition circuit 200. The second end of the coupler 320 is electrically connected to the first acquisition circuit 100. That is, a first end of the phase shifter 310 may receive any one of the first signal and the second signal; accordingly, the second terminal of the coupler 320 may receive the other of the first signal and the second signal.
In one embodiment, the coupler 320 may be a 3dB coupler. Converting the first signal into the first high frequency magnitude signal through a 3dB coupler. The first high frequency amplitude signal is then converted to the adjustable first amplitude signal (i.e., AFC _ a) by the first frequency response detector 330, thereby achieving linear control of the first amplitude signal. Likewise, the second signal is converted into the second high frequency magnitude signal by a 3dB coupler. The second high frequency amplitude signal is then converted into an adjustable second amplitude signal (i.e., AFC _ B) by the second frequency response detector 340, thereby achieving linear control of the second amplitude signal.
For example, as shown in fig. 7, the first high frequency amplitude signal is converted into the linearly adjustable first amplitude signal by the first frequency response detector 330. The second high frequency amplitude signal is converted into the linearly adjustable second amplitude signal by the second frequency response detector 340. This achieves a monotonic and linear relationship between the difference signal and the frequency (as shown in fig. 8). As shown in fig. 9 again, the first high frequency amplitude signal is converted into the linearly adjustable first amplitude signal by the first frequency response detector 330. The second high frequency amplitude signal is converted into the linearly adjustable second amplitude signal by the second frequency response detector 340. This achieves a nearly monotonic and linear relationship between the difference signal and the frequency (as shown in fig. 10).
In one embodiment, a frequency response detector refers to a detector with frequency response capability. In one embodiment, the AFC module 300 further comprises: a delay line and a filter. A second terminal of the phase shifter 310 is electrically connected to a first terminal of the coupler 320 through the delay line and the filter in this order. A filter may also be connected in series between the second end of the coupler 320 and the second acquisition circuit 200. The interference signal input to the coupler 320 can be filtered by a filter, and the stability of the first signal and the second signal can be improved.
Referring to fig. 11, another embodiment of the present application is a control device 10 based on an automatic frequency control module. The automatic frequency control module based control device 10 includes: a first acquisition circuit 100, a second acquisition circuit 200, an AFC module 300, and a control module 400. The first end of the first acquisition circuit 100 is used for electrically connecting with a signal source 101. The second terminal of the first acquisition circuit 100 is configured to be electrically connected to a load 102. The first acquisition circuit 100 is configured to acquire a first signal output by the signal source 101. A first terminal of the second acquisition circuit 200 is configured to be electrically connected to the load 102. The second acquisition circuit 200 is configured to acquire a second signal reflected by the load 102. The AFC module 300 is electrically connected to the first acquisition circuit 100 and the second acquisition circuit 200, respectively. The AFC module 300 is configured to convert the first signal into a first amplitude signal. The AFC module 300 is configured to convert the second signal into a second amplitude signal.
The control module 400 is electrically connected to the AFC module 300. The control module 400 is configured to determine a best matching frequency according to the output signal of the load 102, and adjust the first signal output by the signal source 101 based on the best matching frequency. The control module 400 is further configured to adjust the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter 310 corresponding to the best matching frequency is zero. The output signal of the load 102 comprises a target current or dose rate.
In an embodiment, the specific structures of the first acquisition circuit 100, the second acquisition circuit 200, the AFC module 300, and the control module 400 may all adopt the structures described in the above embodiments, and repeated descriptions are omitted here. In one embodiment, the signal source 101 may be a power signal source. In one embodiment, the first signal collected by the first collection circuit 100 may be a power signal. In one embodiment, the second signal collected by the second collecting circuit 200 is a power signal. In one embodiment, the load 102 may be an electron linac.
In one embodiment, the determining the best matching frequency by the control module 400 according to the output signal of the load 102 is: the control module 400 can determine the best match frequency based on the target current or dose rate output by the load 102. Specifically, the control module 400 can determine whether the target current or dose rate output by the load 102 reaches a maximum value. If it is determined that the target current or dose rate output by the load 102 reaches a maximum value, it is determined that the frequency currently fed into the load 102 is the best matching frequency.
In one embodiment, after determining the best matching frequency, the control module 400 adjusts the control logic of the signal source 101 to output the first signal based on the best matching frequency; and after the adjustment of the first signal output by the signal source 101 based on the best matching frequency is completed, the control logic of the control module 400 adjusting the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal may adopt the manner described in the above embodiments, and details are not repeated here.
When the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, the control module 400 may lock the current phase of the phase shifter 310. Meanwhile, the first signal output by the signal source 101 is adjusted according to the first amplitude signal and the second amplitude signal output by the AFC module 300, so that the first signal output by the signal source 101 automatically changes along with the load 102, thereby improving the control accuracy.
In this embodiment, the first acquisition circuit 100 acquires a first signal output by the signal source 101. The second signal reflected by the load 102 is collected by the second collecting circuit 200. The first signal is converted into a first amplitude signal and the second signal is converted into a second amplitude signal by the AFC module 300. An optimal matching frequency is determined by the control module 400 according to the output signal (target current or dose rate) of the load 102, and the first signal output by the signal source 101 is adjusted based on the optimal matching frequency. Meanwhile, the phase of the phase shifter 310 in the AFC module 300 is adjusted by the control module 102 according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter 310 at the position corresponding to the optimal matching frequency is zero, thereby realizing automatic adjustment of the phase shifter 310, and enabling the AFC module 300 to work at the optimal working point, which not only improves the control precision, but also has the advantage of simple operation.
Referring to fig. 12, another embodiment of the present application provides a control method based on an automatic frequency control module. In one embodiment, the control method based on the automatic frequency control module can be applied to the control device 10 based on the automatic frequency control module in any one of the above embodiments. The method comprises the following steps:
s102: a first signal output by the signal source 101 and a second signal reflected by the load 102 are received.
In one embodiment, the first signal output by the signal source 101 and the second signal reflected by the load 102 may be received by the control module 400. Specifically, the first signal output by the signal source 101 may be collected by the first collecting circuit 100, and the first collecting circuit 100 sends the collected first signal to the control module 400. The second signal reflected by the load 102 may be collected by the second collecting circuit 200, and the second collecting circuit 200 transmits the collected second signal to the control module 400.
In an embodiment, the specific structures of the first acquisition circuit 100, the second acquisition circuit 200, and the control module 400 may all adopt the structures described in the above embodiments, and are not repeated herein. In one embodiment, the signal source 101 may be a power signal source. In one embodiment, the first signal may be a power signal. In one embodiment, the second signal may be a power signal. In one embodiment, the load 102 may be an electron linac.
S104: the first signal output by the signal source 101 is adjusted based on the best matching frequency.
In an embodiment, the control module 400 may adjust the first signal output by the signal source 101 based on the best matching frequency (for details, refer to the above embodiments, and are not described herein again).
In one embodiment, the best matching frequency may be determined by the control module 400 from the first signal and the second signal. Specifically, the control module 400 may determine the best matching frequency according to a ratio of the second signal to the first signal. The second signal and the first signal vary with frequency, and when the ratio of the second signal to the first signal is minimum (infinitely close to zero, but not equal to zero) at a certain frequency point, it can be determined that the current frequency point is the best matching frequency.
S106: the first signal is converted to a first amplitude signal by the AFC module 300 and the second signal is converted to a second amplitude signal by the AFC module 300.
In one embodiment, the first signal may be converted to a first amplitude signal by the AFC module 300 and the second signal may be converted to a second amplitude signal by the AFC module 300 by the control module 400. In an embodiment, the specific structure and the signal conversion logic of the AFC module 300 may refer to the manner described in the above embodiments, and are not repeated herein.
S108: and adjusting the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal, so as to make the phase of the phase shifter 310 at the position corresponding to the best matching frequency zero.
In one embodiment, the phase of the phase shifter 310 in the AFC module 300 may be adjusted by the control module 400 according to the first amplitude signal and the second amplitude signal to achieve zero phase in the phase shifter 310 corresponding to the best matching frequency. Specifically, after the first signal output by the signal source 101 is adjusted based on the best matching frequency, the control module 400 may adjust the phase of the phase shifter 310 in the AFC module 300 according to the first amplitude signal and the second amplitude signal. For example, the control module 400 may compare the first amplitude signal and the second amplitude signal to obtain a difference signal. If the difference signal is a non-zero signal, the control module 400 adjusts the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero.
In one embodiment, if the difference signal is a non-zero signal, it means: the difference signal corresponds to a value greater than zero or less than zero. When the value corresponding to the difference signal is greater than zero, the phase of the corresponding phase shifter 310 is less than zero, and the phase of the phase shifter 310 may be increased by the control module 400, so that the phase of the phase shifter 310 is equal to zero. Conversely, when the value corresponding to the difference signal is smaller than zero, the phase of the corresponding phase shifter 310 is larger than zero, and the phase of the phase shifter 310 may be decreased by the control module 400, so that the phase of the phase shifter 310 is equal to zero. As can be seen from the above, if the difference signal is a non-zero signal, the control module 400 may adjust the phase of the phase shifter 310 according to the difference signal, so that the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, thereby implementing automatic adjustment of the phase shifter 310, enabling the AFC module to operate at the best operating point, and further improving the control accuracy.
In one embodiment, if the difference signal is a zero signal, the control module 400 does not adjust the phase of the phase shifter 310. I.e. when the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero. When the phase of the phase shifter 310 at the position corresponding to the best matching frequency is zero, the control module 400 may lock the current phase of the phase shifter 310. Meanwhile, the first signal output by the signal source 101 is adjusted according to the first amplitude signal and the second amplitude signal output by the AFC module 300, so that the first signal output by the signal source 101 automatically changes along with the load 102, thereby improving the control accuracy.
In this embodiment, the control method based on the AFC module can realize automatic adjustment of the phase shifter 310 through the control logic of steps S102 to S108, so that the AFC module 300 operates at the optimal operating point, which not only improves the control accuracy, but also has the advantage of simple operation.
In one embodiment, before the step of adjusting the first signal output by the signal source 101 based on the best matching frequency, the method further comprises: an output signal of the load 102 is received, the output signal of the load 102 comprising a target current or a dose rate. The best matching frequency is determined from the output signal of the load 102.
In one embodiment, the best matching frequency may be determined by the control module 400 from the output signal of the load 102. Specifically, the control module 400 can determine whether the target current or dose rate output by the load 102 reaches a maximum value. If it is determined that the target current or dose rate output by the load 102 reaches a maximum value, it is determined that the frequency currently fed into the load 102 is the best matching frequency. In an embodiment, after determining the best matching frequency, the control module 400 adjusts the control logic of the signal source 101 for outputting the first signal based on the best matching frequency in the manner described in the foregoing embodiment, which is not described herein again.
Referring to fig. 13, another embodiment of the present application provides a radiation therapy device 20. The radiotherapy apparatus 20 comprises: the automatic frequency control module based control device 10 and the load 102 according to any of the above embodiments. The load 102 is electrically connected to the second terminal of the first acquisition circuit 100 and the first terminal of the second acquisition circuit 200, respectively. In one embodiment, the load 102 may be an electron linac. The radiotherapy apparatus 20 described in this embodiment, with the control device 10 based on the AFC module according to any embodiment, can realize automatic adjustment of the phase shifter 310, so that the AFC module 300 operates at an optimal operating point, which not only improves the control accuracy, but also has the advantage of simple operation.
In summary, the first signal output by the signal source 101 is collected by the first collecting circuit 100. The second signal reflected by the load 102 is collected by the second collecting circuit 200. The first signal is converted into a first amplitude signal and the second signal is converted into a second amplitude signal by the AFC module 300. Determining, by the control module 400, a best matching frequency according to the first signal and the second signal, and adjusting the first signal output by the signal source 101 based on the best matching frequency. Meanwhile, the phase of the phase shifter 310 in the AFC module 300 is adjusted by the control module 102 according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter 310 at the position corresponding to the optimal matching frequency is zero, thereby realizing automatic adjustment of the phase shifter 310, and enabling the AFC module 300 to work at the optimal working point, which not only improves the control precision, but also has the advantage of simple operation.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (16)

1. A control device based on an automatic frequency control module is characterized by comprising:
a first acquisition circuit (100), a first end of the first acquisition circuit (100) is used for being electrically connected with a signal source (101), a second end of the first acquisition circuit (100) is used for being electrically connected with a load (102), and the first acquisition circuit (100) is used for acquiring a first signal output by the signal source (101);
a second acquisition circuit (200), a first end of the second acquisition circuit (200) is used for electrically connecting with the load (102), and the second acquisition circuit (200) is used for acquiring a second signal reflected by the load (102);
an AFC module (300) electrically connected to the first acquisition circuit (100) and the second acquisition circuit (200), respectively, for converting the first signal into a first amplitude signal and for converting the second signal into a second amplitude signal; and
a control module (400) electrically connected to the AFC module (300) for adjusting the first signal output by the signal source (101) based on a best matching frequency, and for adjusting a phase of a phase shifter (310) in the AFC module (300) according to the first amplitude signal and the second amplitude signal, so that the phase of the phase shifter (310) at a position corresponding to the best matching frequency is zero.
2. The afc-module based control apparatus as claimed in claim 1, wherein when the phase of the phase shifter (310) at the position corresponding to the best matching frequency is zero, the control module (400) locks the phase of the phase shifter (310) and adjusts the first signal output by the signal source (101) according to the first amplitude signal and the second amplitude signal.
3. The afc-based control apparatus of claim 1, wherein the control module (400) is configured to perform a difference between the first amplitude signal and the second amplitude signal to obtain a difference signal, and if the difference signal is a non-zero signal, the control module (400) adjusts the phase of the phase shifter (310) according to the difference signal, so that the phase of the phase shifter (310) at the position corresponding to the best matching frequency is zero.
4. The afc-module based control apparatus according to claim 1, wherein the control module (400) is electrically connected to the first acquisition circuit (100) and the second acquisition circuit (200), respectively, the control module (400) being configured to determine the best matching frequency from the first signal and the second signal.
5. The afc-module based control apparatus according to claim 4, wherein the control module (400) comprises:
the judging unit (410) is respectively electrically connected with the first acquisition circuit (100) and the second acquisition circuit (200) and is used for determining the optimal matching frequency according to the first signal and the second signal;
a frequency control unit (420) electrically connected to the judging unit (410) and the AFC module (300), respectively, for adjusting the first signal output by the signal source (101) according to the optimal matching frequency; and
and the phase shifter control unit (430) is electrically connected with the AFC module (300) and is used for subtracting the first amplitude signal from the second amplitude signal to obtain a difference signal, and if the difference signal is a non-zero signal, the phase shifter control unit (430) adjusts the phase of the phase shifter (310) according to the difference signal so that the phase of the phase shifter (310) at the position corresponding to the optimal matching frequency is zero.
6. The afc-module based control apparatus of claim 1, wherein the control module (400) is further configured to determine a best-match frequency based on an output signal of the load (102), the output signal of the load (102) comprising a target current or a dose rate.
7. The afc-module based control apparatus according to claim 6, wherein the control module (400) comprises:
a judging unit (410) for determining the best matching frequency from an output signal of the load (102);
a frequency control unit (420) electrically connected to the judging unit (410) and the AFC module (300), respectively, for adjusting the first signal output by the signal source (101) according to the optimal matching frequency; and
and the phase shifter control unit (430) is electrically connected with the AFC module (300) and is used for subtracting the first amplitude signal from the second amplitude signal to obtain a difference signal, and if the difference signal is a non-zero signal, the phase shifter control unit (430) adjusts the phase of the phase shifter (310) according to the difference signal so that the phase of the phase shifter (310) at the position corresponding to the optimal matching frequency is zero.
8. The automatic frequency control module-based control device according to claim 5 or 7, wherein the phase shifter control unit (430) comprises:
a comparator (431) electrically connected to the AFC module (300) for subtracting the first amplitude signal and the second amplitude signal to obtain a difference signal; and
and the controller (432) is respectively and electrically connected with the comparator (431) and the AFC module (300), and if the difference signal is a non-zero signal, the controller (432) adjusts the phase of the phase shifter (310) in the AFC module (300) according to the difference signal so as to enable the phase of the phase shifter (310) at the position corresponding to the optimal matching frequency to be zero.
9. The automatic frequency control module-based control device according to any one of claims 1-7, wherein the AFC module (300) comprises:
a phase shifter (310), a first end of the phase shifter (310) being electrically connected to the first acquisition circuit (100) for receiving the first signal;
a coupler (320), a first end of the coupler (320) being electrically connected to a second end of the phase shifter (310), a second end of the coupler (320) being electrically connected to the second acquisition circuit (200) for converting the first signal into a first high frequency amplitude signal and for converting the second signal into a second high frequency amplitude signal;
a first frequency response detector (330) electrically connected to the coupler (320) and the control module (400), respectively, for converting the first high frequency amplitude signal to the first amplitude signal and outputting the first amplitude signal to the control module (400); and
a second frequency response detector (340) electrically connected to the coupler (320) and the control module (400), respectively, for converting the second high frequency amplitude signal to the second amplitude signal and outputting the second amplitude signal to the control module (400).
10. The automatic frequency control module-based control device according to any one of claims 1-7, further comprising:
an isolator (500), a first end of the isolator (500) being electrically connected to a second end of the first acquisition circuit (100), a second end of the isolator (500) being for electrical connection to the load (102).
11. A control method based on an automatic frequency control module is characterized by comprising the following steps:
receiving a first signal output by a signal source (101) and a second signal reflected by a load (102);
adjusting the first signal output by the signal source (101) based on a best match frequency;
-converting the first signal into a first amplitude signal by an AFC module (300), and converting the second signal into a second amplitude signal by the AFC module (300);
adjusting the phase of a phase shifter (310) in the AFC module (300) according to the first amplitude signal and the second amplitude signal to achieve zero phase of the phase shifter (310) at the position corresponding to the best matching frequency.
12. The afc-module based control method of claim 11, wherein prior to the step of adjusting the first signal output by the signal source (101) based on the best-match frequency, the method further comprises:
determining the best matching frequency from the first signal and the second signal.
13. The afc-module based control method of claim 11, wherein prior to the step of adjusting the first signal output by the signal source (101) based on the best-match frequency, the method further comprises:
receiving an output signal of the load (102), the output signal of the load (102) comprising a target current or a dose rate;
determining the best matching frequency from an output signal of the load (102).
14. The automatic frequency control module-based control method according to any one of claims 11-13, wherein the method further comprises:
when the phase of the phase shifter (310) at the position corresponding to the best matching frequency is zero, the phase of the phase shifter (310) is locked, and the first signal output by the signal source (101) is adjusted according to the first amplitude signal and the second amplitude signal.
15. The AFC-module based control method according to any of claims 11-13, wherein the step of adjusting the phase of the phase shifter (310) in the AFC module (300) according to the first amplitude signal and the second amplitude signal to achieve zero phase of the phase shifter (310) at the position corresponding to the best matching frequency comprises:
obtaining a first amplitude signal and a second amplitude signal;
and if the difference signal is a non-zero signal, adjusting the phase of the phase shifter (310) according to the difference signal so as to realize that the phase of the phase shifter (310) at the position corresponding to the optimal matching frequency is zero.
16. A radiotherapy apparatus, characterized by comprising: an automatic frequency control module based control device (10) according to any of claims 1-7; and
a load (102) electrically connected to the second terminal of the first acquisition circuit (100) and the first terminal of the second acquisition circuit (200), respectively.
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