CN109091760B - Microwave power source, treatment equipment and microwave signal generation method - Google Patents
Microwave power source, treatment equipment and microwave signal generation method Download PDFInfo
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Abstract
The invention provides a microwave power source, treatment equipment and a microwave signal generation method. The microwave power source comprises a frequency synthesizer, an attenuator and a radio frequency amplification module which are connected in sequence, and the frequency synthesizer and the attenuator are also connected with the microprocessor control unit respectively. The frequency synthesizer generates a microwave signal according to a set frequency signal sent by the microprocessor control unit, and the microwave signal is output after being subjected to power attenuation by the attenuator and signal amplification by the radio frequency amplification module. Therefore, the microprocessor control unit sends the set frequency signal, the frequency synthesizer can generate the microwave signal with the set frequency, and compared with the prior art, the microwave power source can accurately control the frequency of the microwave signal emitted by the microwave power source. Meanwhile, the attenuation control signal is sent by the microprocessor control unit, and the attenuator can accurately adjust the power of the microwave signal.
Description
Technical Field
The invention relates to the field of microwave treatment, in particular to a microwave power source, treatment equipment and a microwave signal generation method.
Background
Microwave therapy for diseases is mainly achieved by thermal effects. 70% of human tissues are all composed of water molecules, the water molecules are polar molecules, the magnetic resistance between the polar molecules can generate damping effect on oscillation, microwave energy can be consumed to generate heat, and simultaneously, the microwave has better penetrability on the human tissues, so that the direct heating of the focus of the human body can be realized through microwave radiation to achieve better treatment effect.
For example, in tumor treatment, a microwave antenna can be implanted into a tumor body under the guidance of medical images, polar molecules in tissues move at high speed under the action of a microwave field to generate heat, and when the temperature rises to above 60-100 ℃, proteins of tumor cells are denatured and solidified, so that irreversible necrosis is caused. The microwave ablation therapy method has the advantages of small wound, low pain, good effect, quick healing and the like, and becomes a preferred tumor therapy method.
The microwave therapeutic apparatus mainly comprises a microwave power source and a microwave antenna radiator (hereinafter referred to as antenna). The microwave power source is mainly used for generating and transmitting high-power microwave signals and is a core component of the microwave therapeutic apparatus. At present, the microwave power source at home and abroad mainly adopts a magnetron technology, but the magnetron has the defects of non-settable microwave signal frequency, complex frequency spectrum, difficult linear control of emission power, poor accuracy of emission power and the like, and is the most important obstacle in the development of the microwave treatment technology at present.
Disclosure of Invention
The embodiment of the invention provides a microwave power source, treatment equipment and a microwave signal generation method, which are used for accurately controlling the frequency and power of a microwave signal emitted by the microwave power source.
The utility model provides a microwave power source, microwave power source includes frequency synthesizer, attenuator, radio frequency amplification module, microprocessor control unit, frequency synthesizer the attenuator with the radio frequency amplification module connects gradually, just frequency synthesizer the attenuator respectively with microprocessor control unit connects, wherein:
the microprocessor control unit is used for outputting a set frequency signal and outputting an attenuation control signal aiming at the set frequency signal;
the frequency synthesizer is used for outputting microwave signals with corresponding frequencies according to the set frequency signals output by the microprocessor control unit;
the attenuator is used for performing power attenuation on the microwave signal output by the frequency synthesizer according to the attenuation control signal output by the microprocessor control unit;
and the radio frequency amplification module is used for amplifying the microwave signal after power attenuation and then outputting the microwave signal.
A microwave treatment apparatus comprising a microwave power source as described above, or a microwave power source and a microwave antenna radiator as described above.
A method of microwave signal generation, the method comprising:
outputting a set frequency signal and outputting an attenuation amount control signal for the set frequency signal;
outputting microwave signals with corresponding frequencies according to the set frequency signals;
according to the attenuation control signal, performing power attenuation on the microwave signal with the corresponding frequency;
and amplifying the microwave signal after power attenuation and outputting the microwave signal.
The embodiment of the invention provides a semiconductor microwave power source which comprises a frequency synthesizer, an attenuator and a radio frequency amplification module which are sequentially connected, wherein the frequency synthesizer and the attenuator are respectively connected with a microprocessor control unit. The frequency synthesizer generates a microwave signal according to a set frequency signal sent by the microprocessor control unit, and the microwave signal is output after being subjected to power attenuation by the attenuator and signal amplification by the radio frequency amplification module. Therefore, the microprocessor control unit sends the set frequency signal, the frequency synthesizer can generate the microwave signal with the set frequency, and compared with the prior art, the microwave power source can accurately control the frequency of the microwave signal emitted by the microwave power source. Meanwhile, the attenuation control signal is sent by the microprocessor control unit, and the attenuator can accurately adjust the power of the microwave signal. Further, the embodiment of the invention also provides microwave treatment equipment comprising the semiconductor microwave power source of the embodiment of the invention.
Drawings
FIG. 1 is a schematic diagram of return loss under different temperature conditions according to an embodiment of the present invention;
fig. 2 is a schematic diagram of return loss curves at different temperatures corresponding to each frequency point according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a microwave power source according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of adaptively adjusting the frequency of the microwave power source according to the second embodiment of the present invention;
fig. 5 is a schematic flow chart of adaptively adjusting the power of the microwave power source according to the third embodiment of the present invention;
fig. 6 is a schematic flow chart of a microwave signal generation method according to a sixth embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a semiconductor microwave power source, which controls the frequency and the power of a microwave signal emitted by the microwave power source through a Microprocessor Control Unit (MCU) to realize the accurate control of the frequency and the power of the microwave signal.
Further, the inventor researches and discovers that in the application of the microwave therapeutic apparatus, the microwave power source transmits a microwave signal to the antenna, and the heat treatment or the ablation is carried out by radiating power to the therapeutic object (human tissue) through the antenna. Since human tissue is not a standard 50 ohm (Ω) ideal load, there must be a portion of the power reflected back, which is referred to as reflected power. Defining the forward output power of the microwave signal emitted by the microwave power source as PTRReflected power of PREVActual effective transmit power of PEMWhere the units are watts (W), then, PEM＝PTR-PREVAnd the degree of load matching can be measured by return loss (Return ═ 10lg (P)REV/PTR) In decibels (dB). In practical application, the position where the antenna intervenes in a human body and the temperature change of human tissues around the antenna in a treatment process influence the radiation effect of the antenna, so that the treatment effect is poor and even danger is generated.
Taking the output frequency of the microwave power source of the microwave therapeutic apparatus as 2450MHz as an example, the inventor finds that the return loss corresponding to the antenna under different temperature conditions is recorded as shown in fig. 1 when the antenna of the microwave therapeutic apparatus is inserted into the pork liver and the pork liver is heated at the same time, and the return loss is changed along with the temperature rise. Therefore, the embodiment of the present invention provides that, in order to enable the power of the microwave signal emitted by the microwave power source to accurately meet the actual requirement, the attenuation control signal may be adaptively adjusted according to the change of the return loss, so that the power emitted by the microwave power source may be adaptively adjusted to the actually required power.
Meanwhile, the inventor finds that each frequency point in the working frequency band (taking the working frequency band as 2400 MHz-2500 MHz as an example) is scanned, the return loss corresponding to the antenna at different temperatures is determined, and the frequency point with the corresponding minimum return loss at different temperatures, namely the best matching frequency point, can be obtained. A schematic diagram of return loss curves at different temperatures corresponding to each frequency point is shown in fig. 2. Therefore, in order to reduce the power loss as much as possible, the embodiment of the present invention proposes that the actual effective transmit power as high as possible is obtained under the same forward output power, and the frequency can be adaptively adjusted to obtain the maximum actual effective transmit power.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Example one
As shown in fig. 3, which is a schematic structural diagram of a microwave power source according to an embodiment of the present invention, the microwave power source includes a frequency synthesizer 11, an attenuator 12, a radio frequency amplification module 13, and a Microprocessor Control Unit (MCU)14, the frequency synthesizer 11, the attenuator 12, and the radio frequency amplification module 13 are sequentially connected, and the frequency synthesizer 11 and the attenuator 12 are respectively connected to an MCU14, where:
the MCU14 is used for outputting a set frequency signal and outputting a control signal aiming at the attenuation amount of the set frequency signal;
the frequency synthesizer 11 is used for outputting microwave signals with corresponding frequencies according to the set frequency signals output by the MCU;
the attenuator 12 is used for performing power attenuation on the microwave signal output by the frequency synthesizer according to the attenuation control signal output by the MCU;
the radio frequency amplification module 13 is configured to amplify and output the microwave signal after power attenuation. Further, in order to implement adaptive adjustment of the frequency of the microwave signal, the microwave power source provided in this embodiment may further include a detection module 15, which implements detection of the forward output power and the reflected power of the transmitted microwave signal, and is used for the MCU to determine the return loss and adaptively adjust the frequency according to the return loss.
In particular, the frequency synthesizer 11 may be a controllable frequency synthesizer. The attenuator 12 may be a controllable attenuator. The rf amplifying module 13 may be a multi-stage semiconductor rf amplifying module.
The detection module 15 is connected to the rf amplification module 13 and connected to the MCU 14. The rf amplifying module 13 amplifies the input microwave signal, and outputs the amplified signal to the outside through the detecting module 14.
The MCU14 is specifically configured to generate a frequency signal in a designated frequency band as a set frequency signal according to a set period, where the frequency signal generated each time is different, and further configured to determine, according to a first signal and a second signal output by the detection module, a return loss corresponding to the frequency signal in each designated frequency band, and determine, as an optimized set frequency signal, a frequency signal corresponding to a minimum return loss among the determined return losses;
the detection module 15 acts on the microwave signal corresponding to the frequency signal in each designated frequency band output by the rf amplification module, converts the detected forward output power of the microwave signal into a first signal, and converts the reflected power corresponding to the detected microwave signal into a second signal. The first signal and the second signal may be, but are not limited to, analog voltages.
In the case that the microwave power source provided by this embodiment further includes a detection module, the MCU may also adaptively adjust the forward output power according to the return loss, so as to obtain the required actual effective transmitting power.
Specifically, the MCU adjusts the forward output power by adjusting the attenuation control signal.
The detection module 15 is configured to, for the microwave signal output by the radio frequency amplification module, convert the detected forward output power of the microwave signal into a first signal, and convert the reflected power of the microwave signal, which corresponds to the detection, into a second signal;
the MCU14 is specifically configured to determine the attenuation control signal based on the actual effective transmit power required for the forward output power of the microwave signal, and further used for determining whether the absolute value of the difference between the actual effective transmitting power and the required actual effective transmitting power is not more than a set value according to the corresponding first signal and the corresponding second signal, if so, determining the corresponding attenuation control signal at the moment as the finally generated attenuation control signal, otherwise, determining return loss according to the corresponding first signal and the corresponding second signal, determining the forward output power corresponding to the required actual effective transmitting power according to the return loss, and according to the forward output power, determining the attenuation amount control signal again and sending the attenuation amount control signal to the attenuator until the absolute value of the difference between the determined actual effective transmitting power and the required actual effective transmitting power is not greater than a set value.
The embodiment further provides a design method capable of adaptively adjusting the transmitting frequency and the transmitting power of the microwave power source according to different load states on the basis of realizing accurate controllability of the frequency and the power of the microwave signal transmitted by the microwave power source. The matching state of the antenna can be monitored in real time, automatic optimization can be carried out according to the matching state, the optimal microwave transmitting frequency can be found, meanwhile, the microwave energy can be accurately calculated and controlled according to the algorithm, and the problem that the optimal transmitting matching state can not be automatically controlled and maintained in real time by the existing microwave power source is effectively solved. The microwave power source is applied to microwave treatment equipment, such as a microwave treatment instrument, so that the reliability and the stability of the microwave treatment instrument can be greatly improved, and a better treatment effect can be obtained.
In the working process of the microwave power source, in order to realize the load self-adaption function of the invention, the MCU can control the controllable frequency synthesizer according to the values of the forward output power and the reflected power, the controllable frequency synthesizer can be but is not limited to a controllable digital frequency synthesizer, so that the microwave power source can work at the output matching optimal frequency, and the reflected power is reduced as much as possible. The following describes a procedure of adaptively adjusting a frequency in the first embodiment of the present invention by using an embodiment.
Example two
A process of adaptively adjusting the frequency of the microwave power source provided by the second embodiment of the present invention is shown in fig. 4, and includes:
step 101, the MCU sends an initial frequency signal.
In this step, the MCU may send an initial frequency signal to the controllable frequency synthesizer. Taking the designated frequency band of the controllable frequency synthesizer working as 2400MHz to 2500MHz as an example, in this step, the MCU may send 2400MHz as an initial frequency signal to the controllable frequency synthesizer.
Step 102, the MCU determines the return loss.
The controllable frequency synthesizer generates a microwave signal of the frequency after receiving the frequency signal, inputs the generated microwave signal into the controllable attenuator, inputs the microwave signal into the radio frequency amplification module after power attenuation, and outputs the microwave signal to the outside after signal amplification and detection module. The detection module converts the detected forward output power of the output microwave signal (the detected forward output power of the output microwave signal can be understood as the detected forward output power of the antenna without limitation) into a first signal, converts the reflected power of the corresponding detected output microwave signal (the detected reflected power of the output microwave signal can be understood as the detected reflected power of the antenna without limitation) into a second signal, and inputs the converted first signal and second signal into the MCU. The MCU determines return loss according to the first signal and the second signal.
And 103, changing the frequency signal by the MCU and transmitting.
In this step, the MCU may change the frequency signal according to a set length, for example, according to a step of 1MHz, and transmit the changed frequency signal to the controllable frequency synthesizer. That is, in the present embodiment, each frequency from 2400MHz to 2500MHz may be sequentially transmitted as a set frequency signal to the controllable frequency synthesizer every step of 1 MHz.
And step 104, determining the return loss by the MCU.
The controllable frequency synthesizer continues to generate new microwave signals after receiving the new frequency signals. After the microwave signal is output outwards through the detection module, the detection module converts the detected forward output power into a first signal, converts the corresponding detected reflected power into a second signal, and inputs the converted first signal and the converted second signal into the MCU. The MCU again determines the return loss from the first signal and the second signal.
And 105, determining whether the designated frequency band is scanned completely by the MCU.
Taking the designated frequency band as 2400 MHz-2500 MHz as an example, assuming that the initial frequency signal is 2400MHz, and changing the frequency signal by stepping 1MHz according to the set period, in this step, it may be determined whether the frequency signal reaches 2500MHz, if the frequency signal reaches 2500MHz, it is determined that the designated frequency band is completely scanned, step 106 is continuously executed, otherwise, step 103 is executed again.
And step 106, determining the minimum return loss by the MCU.
And the MCU determines the minimum return loss from the determined return losses.
And step 107, determining the optimal matching frequency by the MCU.
The MCU determines the frequency signal corresponding to the minimum return loss as the optimal matching frequency, sends the frequency signal to the controllable frequency synthesizer, and can keep the frequency signal unchanged, so that the microwave power source can stably work under the optimal matching frequency.
The microwave signal with the optimal matching frequency generated by the controllable frequency synthesizer has the least reflected power and the highest actual effective transmitting power under the condition of the same forward output power. Under the condition that the forward output power is 200W, the return loss and the actual effective transmitting power under different tissue temperature conditions are obtained through testing under the condition that the frequency is set at a fixed value of 2450MHz in the table 1, and the return loss, the actual effective transmitting power and the actual effective transmitting power under different tissue temperature conditions are obtained through testing after the frequency self-adaptive adjustment is carried out in the table 2, and the lifting value and the lifting proportion of the return loss, the actual effective transmitting power and the actual effective transmitting power under different tissue temperature conditions are obtained through testing.
TABLE 1
| Tissue temperature (. degree.C.) | 40 | 50 | 60 | 70 | 80 | 90 |
| Return loss (dB) | -11 | -9 | -7 | -5 | -4 | -3.5 |
| Actual effective transmit power (W) | 184.1134 | 174.8215 | 160.0948 | 136.7544 | 120.3786 | 110.6633 |
TABLE 2
| Tissue temperature (. degree.C.) | 40 | 50 | 60 | 70 | 80 | 90 |
| Best match frequency point (MHz) | 2440 | 2450 | 2460 | 2470 | 2480 | 2490 |
| Return loss (dB) | -13 | -11 | -12 | -13 | -12 | -12 |
| Actual effective transmit power (W) | 189.9763 | 184.1134 | 187.3809 | 189.9763 | 187.3809 | 187.3809 |
| Effective power boost value (W) | 5.86282 | 9.291944 | 27.2861 | 53.22181 | 67.00229 | 76.71757 |
| Effective power increasing ratio (%) | 3.18％ | 5.32％ | 17.04％ | 38.92％ | 55.66％ | 69.33％ |
According to the scheme provided by the embodiment of the invention, in the working process of the microwave therapeutic apparatus, the microwave power source automatically scans and calculates the return loss of the antenna under different frequencies, the self-adaption optimization is carried out, and the working frequency is set as the optimal point of the return loss, so that the reflected power is minimum, the actual effective transmitting power is maximum, and the effect of self-adaption of the load is achieved. Through table 1 and table 2, it can be seen that under different temperature conditions, the return loss is always kept in the best state, the actual effective transmitting power is greatly increased, especially under the condition of higher temperature, the increasing proportion of the actual effective transmitting power reaches more than 40%, and the receiving efficiency of the microwave energy can be improved to a greater extent, so that the treatment time can be shortened, and the treatment effect can be improved.
In the working process of the microwave power source, accurate calculation and adjustment of the actual effective transmitting power can be realized. Next, a procedure of adaptively adjusting power in the first embodiment of the present invention is described in the third embodiment.
EXAMPLE III
A flow of self-adaptive power adjustment of microwave power provided by the third embodiment of the present invention is shown in fig. 5, and includes:
step 201, the MCU sends an attenuation control signal.
In this step, the MCU determines the attenuation control signal according to the required actual effective transmitting power, and sends the attenuation control signal to the controllable attenuator, so that the forward output power of the microwave signal corresponding to the output set frequency signal detected by the detection module is the required actual effective transmitting power.
Assuming the actual effective transmit power P requiredEMA. In this step, by controlling the attenuation amount control signal, it is necessary to make the forward output power PTR＝A。
Step 202, the detection module detects the forward output power and the reflected power.
In this step, the detection module may detect the forward output power and the reflected power of the output microwave signal, convert the detected forward output power into a first signal, convert the corresponding detected reflected power into a second signal, and input the first signal and the second signal into the MCU.
Step 203, the MCU determines the actual effective transmit power.
In this step, the MCU may determine the actual effective transmit power from the first and second signals (i.e., from the forward output power and the reflected power).
Assuming the determined actual effective transmit power PEM＝A’。
Step 204, the MCU determines whether the actual effective transmitting power meets the requirement.
In this step, the MCU may determine whether the absolute value of the difference between the actual effective transmit power and the required actual effective transmit power is not greater than a set value. If so, step 205 may be performed. Otherwise, execution may continue with step 206.
In this step, the MCU may determine whether the absolute value of A-A' is not greater than a set value. In the present embodiment, the set value may be set to 0. When the set value is set to 0, the MCU can determine whether a' is a in this step.
And step 205, keeping the attenuation amount control signal unchanged by the MCU.
In this step, if the MCU determines that the absolute value of the difference between the actual effective transmitting power and the required actual effective transmitting power is not greater than the set value, the corresponding attenuation control signal can be determined as the finally generated attenuation control signal, and the attenuation control signal can be kept unchanged, so that the forward output power of the microwave power source is kept unchanged, and the microwave power source operates stably, thereby continuously obtaining the required actual effective transmitting power.
And step 206, the MCU adjusts the attenuation control signal and transmits the attenuation control signal.
In this step, the MCU may determine the return loss from the first signal and the second signal. And determining the forward output power corresponding to the required actual effective transmitting power according to the return loss, determining the attenuation amount control signal again according to the forward output power, and sending the attenuation amount control signal to the controllable attenuator. And proceeds to step 202.
Required actual effective transmission power PEMWhen equal to a, assume the required forward output power PTRB. If the MCU determines the Return loss from the first and second signals as C, then B may be determined as a/(1-10) according to the formula C-10 lg ((B-a)/B)C/10). Therefore, the attenuation control signal is determined again according to the value of B, and the power of the microwave signal is attenuated.
According to the scheme provided by the embodiment, the actual effective transmitting power can be accurately calculated and adjusted, and the aim of accurate treatment is fulfilled. In the application of the microwave therapeutic apparatus, the accurate control of effective microwave emission energy is the key for realizing effective treatment, while in the prior art, the actual effective emission power cannot be controlled and adjusted.
Example four
On the basis of the microwave power sources provided by the first to third embodiments of the present invention, a fourth embodiment of the present invention further provides a microwave therapeutic apparatus, which may include the microwave power sources and the microwave antenna radiators provided by the first to third embodiments of the present invention.
EXAMPLE five
On the basis of the microwave power sources provided in the first to third embodiments of the present invention, a fifth embodiment of the present invention further provides a microwave treatment device, which may include the microwave power sources provided in the first to third embodiments of the present invention. Alternatively, the microwave treatment device can comprise the microwave power source and the microwave antenna radiator provided by the first to the third embodiments of the invention.
EXAMPLE six
An embodiment of the present invention provides a microwave signal generating method, as shown in fig. 6, the method includes the following steps:
and step 301, outputting a set frequency signal and an attenuation control signal.
In this step, a set frequency signal may be output, and an attenuation amount control signal for the set frequency signal may be output.
Wherein, output and set for the frequency signal, specifically include:
generating a frequency signal in a designated frequency band as a set frequency signal according to a set period, wherein the frequency signal generated each time is different;
for the microwave signal corresponding to the frequency signal in each designated frequency band, converting the detected forward output power of the microwave signal into a first signal, and converting the reflected power of the microwave signal correspondingly detected into a second signal;
and determining the return loss corresponding to the frequency signal in each designated frequency band according to the first signal and the second signal, and determining the frequency signal corresponding to the minimum return loss in the determined return loss as the optimized set frequency signal output.
Wherein, the output is directed against the decrement control signal of setting for the frequency signal, specifically includes:
determining an attenuation control signal according to the actual effective transmitting power required by the forward output power of the microwave signal corresponding to the set frequency signal;
for the output microwave signal, converting the detected forward output power of the microwave signal into a first signal, and converting the reflected power of the microwave signal correspondingly detected into a second signal;
and determining whether the absolute value of the difference between the actual effective transmitting power and the required actual effective transmitting power is not greater than a set value or not according to the corresponding first signal and the corresponding second signal, if so, determining the corresponding attenuation control signal at the moment as a finally generated attenuation control signal, otherwise, determining the return loss according to the corresponding first signal and the corresponding second signal at the moment, determining the forward output power corresponding to the required actual effective transmitting power according to the return loss, and determining the attenuation control signal again according to the forward output power until the absolute value of the difference between the determined actual effective transmitting power and the required actual effective transmitting power is not greater than the set value.
And step 302, outputting a microwave signal.
In this step, a microwave signal of a corresponding frequency may be output according to the set frequency signal.
And step 303, performing power attenuation.
In this step, the power of the microwave signal of the corresponding frequency may be attenuated according to the attenuation control signal.
And step 304, amplifying and outputting the signal.
In this step, the microwave signal after power attenuation may be output after signal amplification.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The utility model provides a microwave power source, its characterized in that, microwave power source includes frequency synthesizer, attenuator, radio frequency amplification module, microprocessor control unit, frequency synthesizer the attenuator with the radio frequency amplification module connects gradually, just frequency synthesizer the attenuator respectively with microprocessor control unit connects, wherein:
the microprocessor control unit is used for outputting a set frequency signal and outputting an attenuation control signal aiming at the set frequency signal;
the frequency synthesizer is used for outputting microwave signals with corresponding frequencies according to the set frequency signals output by the microprocessor control unit;
the attenuator is used for performing power attenuation on the microwave signal output by the frequency synthesizer according to the attenuation control signal output by the microprocessor control unit;
the radio frequency amplification module is used for amplifying and outputting the microwave signal after the power attenuation;
the microwave power source also comprises a wave detection module, and the wave detection module is connected with the radio frequency amplification module and the microprocessor control unit;
the detection module is used for converting the detected forward output power of the microwave signal into a first signal and converting the reflected power of the microwave signal into a second signal according to the microwave signal output by the radio frequency amplification module;
the microprocessor control unit is specifically configured to determine an attenuation control signal according to the fact that the forward output power of the microwave signal is the required actual effective transmitting power, and further configured to determine whether an absolute value of a difference between the actual effective transmitting power and the required actual effective transmitting power is not greater than a set value according to the first signal corresponding to the present time and the second signal corresponding to the present time, if so, determine the attenuation control signal corresponding to the present time as a finally generated attenuation control signal, otherwise, determine an echo loss according to the first signal corresponding to the present time and the second signal corresponding to the present time, determine the forward output power corresponding to the required actual effective transmitting power according to the echo loss, and determine the attenuation control signal again according to the forward output power and send the attenuation control signal to the attenuator until the absolute value of the difference between the determined actual effective transmitting power and the required actual effective transmitting power is not greater than the set value.
2. A microwave power source in accordance with claim 1,
the microprocessor control unit is specifically configured to generate a frequency signal in a specified frequency band as a set frequency signal according to a set period, wherein the frequency signal generated each time is different, and further configured to determine, according to a first signal and a second signal output by the detection module, a return loss corresponding to the frequency signal in each specified frequency band, and determine, as an optimized set frequency signal, a frequency signal corresponding to a minimum return loss in the determined return losses;
the detection module is configured to convert, for a microwave signal corresponding to the frequency signal within each specified frequency band output by the radio frequency amplification module, forward output power of the detected microwave signal into a first signal, and convert reflected power of the corresponding detected microwave signal into a second signal.
3. A microwave power source in accordance with claim 1 wherein the frequency synthesizer and the microprocessor control unit are connected via a Serial Peripheral Interface (SPI) bus.
4. A microwave power source in accordance with claim 1 wherein the rf amplification module is a multi-stage semiconductor rf amplification module.
5. A microwave power source according to any of claims 1 to 4 wherein the frequency synthesizer is a controllable frequency synthesizer and the attenuator is a controllable attenuator.
6. Microwave treatment apparatus, characterized in that it comprises a microwave power source according to any of claims 1 to 5, or it comprises a microwave power source according to any of claims 1 to 5 and a microwave antenna radiator.
7. A method of microwave signal generation, the method comprising:
outputting a set frequency signal and outputting an attenuation amount control signal for the set frequency signal;
outputting microwave signals with corresponding frequencies according to the set frequency signals;
according to the attenuation control signal, performing power attenuation on the microwave signal with the corresponding frequency;
amplifying the microwave signal after power attenuation and outputting the microwave signal;
outputting an attenuation control signal for the set frequency signal, specifically comprising:
determining an attenuation control signal according to the actual effective transmitting power required by the forward output power of the microwave signal corresponding to the set frequency signal;
for the output microwave signal, converting the detected forward output power of the microwave signal into a first signal, and converting the reflected power of the microwave signal correspondingly detected into a second signal;
and determining whether the absolute value of the difference between the actual effective transmitting power and the required actual effective transmitting power is not more than a set value or not according to the corresponding first signal and the corresponding second signal, if so, determining the corresponding attenuation control signal at the moment as a finally generated attenuation control signal, otherwise, determining the return loss according to the corresponding first signal and the corresponding second signal at the moment, determining the forward output power corresponding to the required actual effective transmitting power according to the return loss, and determining the attenuation control signal again according to the forward output power until the absolute value of the difference between the determined actual effective transmitting power and the required actual effective transmitting power is not more than the set value.
8. The method of claim 7, wherein outputting the set frequency signal comprises:
generating a frequency signal in a designated frequency band as a set frequency signal according to a set period, wherein the frequency signal generated each time is different;
for the microwave signal corresponding to the frequency signal in each designated frequency band, converting the detected forward output power of the microwave signal into a first signal, and converting the reflected power of the microwave signal correspondingly detected into a second signal;
and determining the return loss corresponding to the frequency signal in each designated frequency band according to the first signal and the second signal, and determining the frequency signal corresponding to the minimum return loss in the determined return loss as an optimized set frequency signal to be output.
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