Output stabilization device of radio frequency power amplifier, radio frequency system and magnetic resonance system

Abstract

The present application relates to an output stabilization device for a radio frequency power amplifier, a radio frequency system, and a magnetic resonance system, wherein the output stabilization device is connected to the radio frequency power amplifier and includes: a gain compensation module and a nonlinear correction module; the gain compensation module compensates the radio frequency input signal according to compensation parameters and preset compensation rules; the nonlinear correction module is used to perform nonlinear correction on the radio frequency input signal. Through this application, the output power fluctuations of the radio frequency power amplifier caused by temperature and humidity changes and power supply voltage fluctuations are compensated, the shortcomings of traditional open-loop compensation are made up, the output of the radio frequency power amplifier is stabilized under different working conditions, and the compensation effect is improved.

Description

Technical Field

[0001] The present application relates to the field of magnetic resonance technology, and in particular to an output stabilization device for a radio frequency power amplifier, a radio frequency system, and a magnetic resonance system. Background Art

[0002] RF power amplifiers are an essential component of magnetic resonance imaging systems. MRI systems place high demands on RF power amplifiers. They amplify the RF pulses emitted by the MRI spectrometer and output them to the transmitting coil to excite the experimental sample. Therefore, the RF power amplifier must maintain stable gain to achieve good imaging results. However, RF power amplifiers have nonlinear characteristics. When operating in the saturation or cutoff regions, they can cause nonlinear distortion of the pulse signal. This distortion includes in-band amplitude and phase distortion and out-of-band spectral expansion, interfering with signal transmission in adjacent channels. Ultimately, this can cause artifacts and distortion in MRI imaging, reducing image quality and hindering disease diagnosis and scientific research.

[0003] Existing RF power amplifier stabilization solutions include: feedback, which uses the output signal to directly suppress the input signal, or indirect negative feedback, which compares the output and input signals through an indirect connection. Another approach is predistortion technology, which essentially inserts a predistorter with a curve characteristic that is inverse to that of the RF power amplifier to perform nonlinear correction. By cascading the predistorter and the RF power amplifier, the RF power amplifier is linearized. However, these solutions fail to consider the impact of amplifier gain fluctuations on compensation during operation, resulting in suboptimal compensation results. Summary of the Invention

[0004] The embodiments of the present application provide an output stabilization device for a radio frequency power amplifier, a radio frequency system, and a magnetic resonance system, so as to at least solve the problem of unsatisfactory output compensation effect of the radio frequency power amplifier in the related art.

[0005] In a first aspect, an embodiment of the present application provides an output stabilization device for a radio frequency power amplifier, wherein the output stabilization device is connected to the radio frequency power amplifier and includes: a gain compensation module and a nonlinear correction module;

[0006] The gain compensation module compensates the RF input signal according to the compensation parameters and the preset compensation rules;

[0007] The nonlinear correction module is used to perform nonlinear correction on the radio frequency input signal.

[0008] In some embodiments, the compensation rule is a mapping relationship between different supply voltages, different junction temperatures, different output powers and corresponding gain compensation amounts.

[0009] In some embodiments, the mapping relationship is a gain compensation table between compensation parameters and corresponding gain compensation amounts.

[0010] In some embodiments, the mapping relationship is a functional relationship between a compensation parameter obtained by data fitting and a corresponding gain compensation amount.

[0011] In some embodiments, the gain compensation module further includes: a signal acquisition module and a compensation amount acquisition module, wherein the signal acquisition module is connected to the RF power amplifier and the compensation amount acquisition module;

[0012] The signal acquisition module is used to obtain the compensation parameters of the radio frequency power amplifier and output them to the compensation amount acquisition module;

[0013] The compensation amount acquisition module is used to obtain the gain compensation amount of the RF power amplifier based on the compensation parameters of the RF power amplifier and the preset compensation rule.

[0014] In some embodiments, the signal acquisition module includes: a temperature acquisition module, a supply voltage acquisition module, and a power acquisition module;

[0015] The supply voltage acquisition module is used to collect the supply voltage of the RF power amplifier;

[0016] The temperature acquisition module is used to obtain the junction temperature of the radio frequency power amplifier;

[0017] The power acquisition module is used to acquire the power of the radio frequency power amplifier.

[0018] In some embodiments, the junction temperature of the RF power amplifier is the sum of the ambient temperature and the junction temperature rise of the power amplifier.

[0019] In some embodiments, the power amplifier junction temperature rise is calculated based on the power loss and equivalent thermal resistance of the RF power amplifier.

[0020] In a second aspect, an embodiment of the present application provides a radio frequency system, comprising an output stabilization device of the radio frequency power amplifier, an radio frequency power amplifier, and a radio frequency coil as described in the first aspect above, wherein the radio frequency power amplifier is connected to the output stabilization device and the radio frequency coil, and the radio frequency input signal is compensated by the output stabilization device and amplified by the radio frequency power amplifier and then emitted through the radio frequency coil.

[0021] In a third aspect, an embodiment of the present application provides a magnetic resonance system, comprising the radio frequency system as described in the second aspect above.

[0022] Compared with the related art, the output stabilization device of the RF power amplifier provided in the embodiment of the present application, by setting a gain compensation module and a nonlinear correction module, adds a gain compensation module on the basis of the traditional scheme of performing nonlinear correction on the RF input signal, thereby compensating for the output power fluctuation of the RF power amplifier caused by changes in related factors, making up for the shortcomings of traditional open-loop compensation, so that the output of the RF power amplifier can be stable under different working conditions, and improving the compensation effect.

[0023] The details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of an output stabilization device for a radio frequency power amplifier in one embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the coordination structure of the output stabilization device and the power amplifier in one embodiment of the present application;

[0027] Figure 3 is a transfer characteristic diagram of a MOSFET in one of the embodiments of the present application;

[0028] Figure 4 is a gain curve diagram of a radio frequency power amplifier in one embodiment of the present application;

[0029] Figure 5 is a schematic structural diagram of an output stabilization device for a radio frequency power amplifier in another embodiment of the present application;

[0030] Figure 6 It is a structural diagram of a radio frequency system in one embodiment of the present application.

[0031] Description of the drawings: 1. Output stabilization device; 11. Gain compensation module; 111. Signal acquisition module; 112. Compensation amount acquisition module; 12. Nonlinear correction module; 2. RF power amplifier; 3-RF coil. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts are within the scope of protection of this application.

[0033] Obviously, the drawings described below are merely examples or embodiments of the present application. Those skilled in the art can, without inventive effort, apply the present application to other similar scenarios based on these drawings. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, changes in design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in this application.

[0034] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments unless there is a conflict.

[0035] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the technical field to which this application belongs. The words "one", "a", "the" and the like used in this application do not indicate a limit on quantity and may indicate the singular or plural. The terms "include", "comprise", "have" and any variations thereof used in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units that are inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The word "multiple" used in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0036] Magnetic resonance imaging (MR) is a type of tomographic imaging that uses the magnetic resonance phenomenon to obtain electromagnetic signals from the human body and reconstruct information about the body. MRI equipment applies radio frequency pulses of a specific frequency to the human body in a static magnetic field, exciting the hydrogen nuclei in the body, causing them to resonate and absorb energy. After the radio frequency pulses cease, the hydrogen nuclei emit radio signals at a specific frequency and release the absorbed energy, which is picked up by an external receiver and processed by a computer to produce an image, known as magnetic resonance imaging. MRI examinations completely eliminate the harmful effects of ionizing radiation on the human body. They offer numerous parameters, a large amount of information, multi-directional imaging capabilities, and high resolution for soft tissues, making them widely used in various fields, especially in medical diagnosis.

[0037] The RF coil is a crucial component of an MRI system. All MRI scans require it. Its function is to transmit RF pulses and receive MRI signals, making it a crucial step in MRI imaging. Typically, an MRI system also includes an RF power amplifier 2 to drive the RF coil. This amplifier receives and amplifies pulse signals, then supplies the amplified signals to the RF coil, thereby driving or controlling the coil to generate an RF magnetic field, thereby generating RF excitation for imaging.

[0038] like Figure 1-2 As shown, this embodiment provides an output stabilization device for an RF power amplifier, wherein the output stabilization device 1 is connected to the RF power amplifier 2 and includes a gain compensation module 11. Specifically, the output stabilization device 1 is used in conjunction with the RF power amplifier 2, and the output stabilization device 1 can be set at the input side of the RF power amplifier 2, and the RF input signal is output to the RF power amplifier 2 after being compensated by the gain compensation module 11 in the output stabilization device 1. Exemplarily, in some embodiments, the gain compensation module 11 can be, for example, a programmable gain amplifier, which compensates the RF input signal according to compensation parameters and preset compensation rules and feeds back to the signal input end of the RF power amplifier 2.

[0039] In some embodiments, the output stabilization device 1 for a radio frequency power amplifier further includes a nonlinear correction module 12. The gain compensation module 11 is connected to the nonlinear correction module 12. In some embodiments, the gain compensation module 11 is connected to the nonlinear correction module 12 and the radio frequency power amplifier 2, respectively; in other embodiments, the nonlinear correction module 12 is connected to the gain compensation module 11 and the radio frequency power amplifier 2, respectively. This application does not impose any specific limitations on this.

[0040] Generally, to obtain high-quality magnetic resonance images, the magnetic resonance system requires that the radio frequency has good linearity within a large dynamic range. However, the radio frequency power amplifier 2 itself is a nonlinear device, and the output signal has large nonlinear distortion. In this embodiment, by providing a nonlinear correction module 12, the radio frequency input signal can be adjusted and the adjusted signal can be output to the radio frequency power amplifier 2. The nonlinear correction module 12 can be implemented using pre-distortion technology, feedforward method, etc. The nonlinear correction module 12 and the radio frequency power amplifier 2 together form a linear amplification system, so that the input signal and the output signal maintain a linear relationship, avoiding nonlinear distortion.

[0041] Due to the high performance requirements placed on the RF power amplifier 2 in magnetic resonance systems, its output power is very high, reaching tens of kilowatts or more. Multiple metal-oxide-semiconductor field-effect transistors (MOSFETs) are typically combined in series and parallel to generate sufficient power. Furthermore, the RF power amplifier must maintain stable gain to achieve good imaging results. Because MOSFETs inherently exhibit nonlinear gain, compensation is required to ensure stable amplifier gain.

[0042] like Figure 3This is a MOSFET transfer characteristic diagram, where the horizontal axis is the input power Vgs (dBm) and the vertical axis is the MOSFET supply current (which is positively correlated and nonlinear with the output power). As can be seen from the figure, at different temperatures Tj (°C), the curve relationship between the output power Id (dBm) and the input power Vgs (dBm) varies, indicating that temperature affects the relationship between input power and output, and therefore the gain value. Furthermore, when RF power amplifier 2 is used within the operating bandwidth of the magnetic resonance RF signal, the junction temperature of the power transistors used in RF power amplifier 2 will also increase, thereby causing the gain of RF power amplifier 2 to change. The figure also shows that when the input power Vgs (dBm) or output power Id (dBm) is below a certain value, the output power and temperature are positively correlated; when it is above this value, the output power and temperature are negatively correlated. Therefore, it is necessary to consider not only the effects of temperature but also the effects of power on gain.

[0043] Figure 4 is the gain curve of the RF power amplifier 2, such as Figure 4 As shown in Figure 1, the amplifier gain curves are inconsistent under different supply voltages. Therefore, in addition to factors such as temperature and power, it is also necessary to compensate for gain fluctuations caused by supply voltage fluctuations.

[0044] As can be seen, changes in the various related factors mentioned above will also cause fluctuations in the power amplifier gain. In this case, existing nonlinear correction schemes cannot compensate for these related factors, resulting in unsatisfactory output stability. In this embodiment, the gain compensation module 11 configures the compensation parameters of the RF power amplifier 2, and performs real-time compensation and adjustment of the RF input signal according to the compensation parameters and preset compensation rules, which can further improve the stability of the RF power amplifier 2.

[0045] In some embodiments, at least one of the supply voltage, junction temperature, and power of the RF power amplifier 2 is configured as a compensation parameter of the RF power amplifier 2. In other embodiments, the compensation parameters can be customized based on operating conditions. Among the compensation parameters, the supply voltage is the voltage value of the RF power amplifier 2; the junction temperature is the sum of the ambient temperature and the junction temperature rise of the power amplifier; and the power is the input power and output power of the RF power amplifier 2. The compensation rule can be a gain compensation table, function, or machine learning model established based on sample data. The compensation rule can be customized and is not specifically limited in this application.

[0046] In summary, the output stabilization device of the RF power amplifier provided in the embodiment of the present application, by setting a gain compensation module and a nonlinear correction module, adds a gain compensation module on the basis of the traditional scheme of performing nonlinear correction on the RF input signal, and compensates the RF input signal according to the compensation parameters and preset compensation rules, so that the output power fluctuation of the RF power amplifier caused by changes in relevant factors is compensated, which makes up for the shortcomings of traditional open-loop compensation, so that the output of the RF power amplifier under different working conditions can be stable, the output fluctuation is significantly improved, and the compensation effect is improved.

[0047] The embodiments of the present application are described and illustrated below through preferred embodiments.

[0048] Based on the above embodiments, in some embodiments, the compensation rule is a mapping relationship between different supply voltages, different junction temperatures, different output powers and corresponding gain compensation amounts.

[0049] Specifically, in this embodiment, factors affecting the output stability of the RF power amplifier and corresponding gain compensation amounts are first obtained. These factors include varying supply voltages, junction temperatures, and output powers. A mapping relationship between these various factors and corresponding gain compensation amounts is pre-established, and this mapping relationship is defined as a gain compensation rule. The power amplifier gain is the difference between the output power and input power of the RF power amplifier, and the gain compensation amount is the difference between the power amplifier gain and the desired gain.

[0050] In a specific embodiment, the mapping relationship can be a gain compensation table between the compensation parameters and the corresponding gain compensation amounts. For example, the gain curve of the RF power amplifier 2 under different compensation parameters can be simulated experimentally to obtain the corresponding gain compensation amounts, thereby establishing a gain compensation table between different compensation parameters and corresponding gain compensation amounts. When gain compensation is performed on the RF power amplifier 2, the gain compensation module 11 queries the pre-stored gain compensation table based on the currently collected compensation parameters to obtain the gain compensation amount obtained by the query, so that the gain compensation module 11 compensates the RF input signal according to the gain compensation amount.

[0051] In another specific embodiment, the mapping relationship is a functional relationship between the compensation parameters obtained by data fitting and the corresponding gain compensation amount. For example, the corresponding gain compensation amount can be obtained by experimentally simulating the gain curve of the RF power amplifier 2 under different compensation parameters. Furthermore, a functional relationship between different compensation parameters and the corresponding gain compensation amount is established by data fitting. When gain compensation is performed on the RF power amplifier 2, the gain compensation module 11 calculates the corresponding gain compensation amount based on the currently collected compensation parameters and the pre-stored functional relationship, so that the gain compensation module 11 compensates the RF input signal according to the gain compensation amount.

[0052] Figure 5 FIG. 1 is a schematic structural diagram of an output stabilization device 1 for a radio frequency power amplifier 2 according to an embodiment of the present application. Figure 5 As shown, based on the above embodiments, in some embodiments, the gain compensation module 11 further includes: a signal acquisition module 111 and a compensation amount acquisition module 112, and the signal acquisition module 111 is connected to the RF power amplifier 2 and the compensation amount acquisition module 112.

[0053] In this embodiment, the signal acquisition module 111 is used to acquire compensation parameters of the RF power amplifier 2 and output them to the compensation value acquisition module 112. The signal acquisition module 111 includes: a temperature acquisition module, a supply voltage acquisition module, and a power acquisition module.

[0054] The supply voltage acquisition module is used to collect the supply voltage of the RF power amplifier 2. For example, the supply voltage of the RF power amplifier 2 can be obtained by sampling using an ADC (Analog to Digital Converter) in the prior art. The ADC sampling method is a prior art in this field and is not described in detail in this application.

[0055] The power acquisition module is used to obtain the power of the RF power amplifier. Specifically, the power includes the input power of the power amplifier and the output power of the power amplifier. The power acquisition module can be, for example, an existing power detection module such as HLW8012, or can be calculated by sampling the power amplifier supply voltage and current values collected by ADC, which is not specifically limited in this application. By obtaining the power of the RF power amplifier, the power amplifier gain is further calculated, and the corresponding power amplifier compensation amount is calculated based on the expected gain.

[0056] In some embodiments, the temperature acquisition module is used to acquire the ambient temperature of the RF power amplifier, wherein, illustratively, the ambient temperature can be detected by a temperature and humidity sensor.

[0057] In other embodiments, the junction temperature refers to the highest temperature of the actual semiconductor device in the electronic device, which is usually higher than the surface temperature of the semiconductor device. When the RF power amplifier 2 is working, its junction temperature will directly affect the reliability and stability of the RF power amplifier 2 and the system in which the RF power amplifier 2 is located. The temperature acquisition module is used to obtain the junction temperature of the RF power amplifier 2, and use the junction temperature as one of the compensation parameters. Specifically, in some embodiments, the junction temperature of the RF power amplifier 2 is the sum of the ambient temperature and the power amplifier junction temperature rise. The junction temperature of the RF power amplifier 2 can be obtained by obtaining the ambient temperature and the power amplifier junction temperature rise. Exemplarily, the power amplifier junction temperature rise can be measured in real time by a temperature sensor; it can also be calculated based on the power loss and equivalent thermal resistance of the RF power amplifier 2. Specifically, the power amplifier supply voltage Vin and input current Iin are first collected to calculate the power amplifier DC power P, and the power amplifier loss power Ploss is calculated based on the power amplifier DC power P and the power amplifier output power Pout. The specific calculation formula is as follows:

[0058] Ploss=Vin*Iin-Pout

[0059] Among them, Ploss is the power loss, w; Vin is the power amplifier supply voltage, v; Iin is the input current, A; Pout is the power amplifier output power, w.

[0060] Then, the power amplifier junction temperature rise ΔT can be determined based on the power amplifier power loss Ploss and the equivalent thermal resistance R:

[0061] ΔT=R*Ploss

[0062] Where R is the equivalent thermal resistance of the power amplifier, Ω.

[0063] It is understandable that in other embodiments, other methods can also be used to obtain the power amplifier junction temperature, such as using a thermistor electrical parameter method, an electrothermal coupling model junction temperature measurement method, etc. This application does not limit the method for obtaining the power amplifier junction temperature rise.

[0064] In this embodiment, the compensation amount acquisition module 112 is used to obtain the gain compensation amount of the RF power amplifier 2 based on the compensation parameters of the RF power amplifier 2 and the preset compensation rules. Specifically, the compensation rule is a mapping relationship between different supply voltages, different junction temperatures, different output powers and corresponding gain compensation amounts. When the mapping relationship can be a gain compensation table between the compensation parameters and the corresponding gain compensation amounts, the compensation amount acquisition module 112 queries the pre-stored gain compensation table based on the currently collected compensation parameters to obtain the queried gain compensation amount. When the mapping relationship is a functional relationship between the compensation parameters obtained by data fitting and the corresponding gain compensation amount, the compensation amount acquisition module 112 calculates the corresponding gain compensation amount based on the currently collected compensation parameters and the pre-stored functional relationship.

[0065] like Figure 6 As shown, in one embodiment, this embodiment further provides a radio frequency system, including an output stabilization device 1 for any one of the radio frequency power amplifiers 2 described above, the radio frequency power amplifier 2, and a radio frequency coil 3. The radio frequency power amplifier 2 is connected to the output stabilization device 1 and the radio frequency coil 3. The radio frequency input signal is compensated by the output stabilization device 1 and amplified by the radio frequency power amplifier 2, and then emitted through the radio frequency coil 3. By configuring the output stabilization device 1 in connection with the radio frequency power amplifier 2, the radio frequency power amplifier 2 can achieve stable output under different operating conditions.

[0066] In one embodiment, this embodiment further provides a magnetic resonance system including the radio frequency system described above. By using the radio frequency system, artifacts and distortions in magnetic resonance imaging can be reduced, thereby ensuring image quality.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An output stabilization device for a radio frequency power amplifier, characterized in that: The output stabilization device (1) is connected to a radio frequency power amplifier and comprises a gain compensation module (11) and a nonlinear correction module (12); The gain compensation module (11) compensates the radio frequency input signal according to the collected compensation parameters and the preset compensation rule and feeds back the compensation to the signal input end of the radio frequency power amplifier (2); wherein the compensation rule is a mapping relationship between different power supply voltages, different junction temperatures, different output powers and corresponding gain compensation amounts; and the power supply voltage, the junction temperature and the power of the radio frequency power amplifier (2) are configured as the compensation parameters; The nonlinear correction module (12) is used to perform nonlinear correction on the radio frequency input signal.

2. The output stabilization device of the radio frequency power amplifier according to claim 1, characterized in that: The mapping relationship is a gain compensation table between compensation parameters and corresponding gain compensation amounts.

3. The output stabilization device of the radio frequency power amplifier according to claim 1, characterized in that: The mapping relationship is a functional relationship between the compensation parameters obtained by data fitting and the corresponding gain compensation amounts.

4. The output stabilization device of a radio frequency power amplifier according to claim 1, wherein: The gain compensation module (11) further comprises: a signal acquisition module (111) and a compensation amount acquisition module (112), wherein the signal acquisition module (111) is connected to the radio frequency power amplifier (2) and the compensation amount acquisition module (112); The signal acquisition module (111) is used to acquire compensation parameters of the radio frequency power amplifier (2) and output the parameters to the compensation amount acquisition module (112); The compensation amount acquisition module (112) is used to obtain the gain compensation amount of the radio frequency power amplifier (2) based on the compensation parameters of the radio frequency power amplifier (2) and the preset compensation rule.

5. The output stabilization device of the radio frequency power amplifier according to claim 4, characterized in that: The signal acquisition module (111) includes: a temperature acquisition module, a supply voltage acquisition module and a power acquisition module; The power supply voltage acquisition module is used to collect the power supply voltage of the radio frequency power amplifier (2); The temperature acquisition module is used to acquire the junction temperature of the radio frequency power amplifier (2); The power acquisition module is used to acquire the power of the radio frequency power amplifier (2).

6. The output stabilization device of a radio frequency power amplifier according to claim 1, characterized in that: The junction temperature of the radio frequency power amplifier (2) is the sum of the ambient temperature and the junction temperature rise of the power amplifier.

7. The output stabilization device of the radio frequency power amplifier according to claim 6, characterized in that: The power amplifier junction temperature rise is calculated based on the power loss and equivalent thermal resistance of the radio frequency power amplifier (2).

8. A radio frequency system, characterized in that: The invention comprises an output stabilization device (1) of a radio frequency power amplifier (2) as claimed in any one of claims 1 to 7, a radio frequency power amplifier (2) and a radio frequency coil (3), wherein the radio frequency power amplifier (2) is connected to the output stabilization device (1) and the radio frequency coil (3), and a radio frequency input signal is compensated by the output stabilization device (1) and amplified by the radio frequency power amplifier (2) and then emitted through the radio frequency coil (3).

9. A magnetic resonance system, characterized in that: Comprising the radio frequency system as claimed in claim 8.

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