Power amplifier circuits, power amplifiers and electronic products

Abstract

This invention discloses a power amplifier circuit, a power amplifier, and an electronic product. The power amplifier circuit includes a power amplifier module, a coupler, and a control module. The input terminal of the power amplifier module is used to receive an input signal, and the output terminal is connected to the coupler. The coupler is connected to the control module and is used to detect the forward and reverse detection voltages of the output signal of the power amplifier module and output them to the control module. The control module is connected to the controlled terminal of the power amplifier module and is used to calculate the standing wave ratio (SWR) corresponding to the forward and reverse detection voltages. When the SWR exceeds a set value, the power amplifier module is controlled to stop working. This invention indirectly obtains the SWR value of the output signal of the power amplifier module through the coupler. When the SWR exceeds the standard, the power amplifier stops working, thus intervening in the temperature rise process of the power amplifier circuit in a timely manner and preventing the device from overheating.

Description

Technical Field

[0001] This utility model relates to the field of power amplifier technology, and in particular to a power amplifier circuit, a power amplifier, and an electronic product. Background Technology

[0002] Power amplifiers are an indispensable component in wireless communication systems, and with the development of communication technologies, power amplifiers have entered a phase of rapid development. Real-world demands place higher requirements on power amplifiers' broadband characteristics, protection mechanisms, and fault response capabilities. Currently, power amplifiers only use temperature sensors for protection. However, temperature sensors can only issue warnings when the power amplifier overheats; they cannot promptly interrupt the temperature rise process and protect the components. Utility Model Content

[0003] The main purpose of this invention is to provide a power amplifier circuit, a power amplifier, and an electronic product, which aims to intervene in the temperature rise process of the power amplifier in a timely manner to avoid overheating of the device.

[0004] To achieve the above objectives, the present invention proposes a power amplifier circuit, which includes:

[0005] Power amplifier module, coupler and control module;

[0006] The input terminal of the power amplifier module is used to receive the input signal, and the output terminal is connected to the coupler; the coupler is connected to the control module and is used to detect the forward and reverse detection voltages of the output signal of the power amplifier module and output them to the control module.

[0007] The control module is connected to the controlled terminal of the power amplifier module and is used to calculate the standing wave ratio (SWR) corresponding to the forward detection voltage and the reverse detection voltage. When the SWR is greater than a set value, the control module stops working.

[0008] Optionally, the power amplifier module further includes: a pre-amplifier unit, a final amplifier unit, and a driver unit;

[0009] The input terminal of the preamplifier unit is used to receive the input signal, and the output terminal is connected to the input terminal of the final amplifier unit; the output terminal of the final amplifier unit is connected to the coupler; the input terminal of the drive unit is connected to the control module, and the output terminal is connected to the controlled terminal of the final amplifier unit.

[0010] The preamplifier unit and the final amplifier unit are used to amplify the power of the input signal;

[0011] The control module is also used to output a shutdown command to the drive unit when the standing wave ratio is greater than a set value, so that the drive unit controls the final stage amplification unit to stop working.

[0012] Optionally, the preamplifier unit includes multiple attenuators and a first-type amplifier; the multiple attenuators and the first-type amplifier are arranged in an alternating pattern of attenuator-first-type amplifier-attenuator.

[0013] The final stage amplification unit includes at least one type II amplifier; the controlled terminal of the type II amplifier is connected to the driving unit.

[0014] The power amplifier circuit further includes a power conversion module, which is connected to multiple first-type amplifiers and at least one second-type amplifier. The power conversion module is used to connect to a power supply voltage and convert the power supply voltage into the operating voltage of the first-type amplifier and the second-type amplifier, and then output the voltage to the first-type amplifier and the second-type amplifier, respectively.

[0015] Optionally, the 1dB compression point output power of the second type of amplifier is less than or equal to a set value.

[0016] Optionally, the second type of amplifier includes a power amplifier tube of model MJ1505, which amplifies signals in the 15-1000MHz frequency band.

[0017] Optionally, the control module includes: a detection control unit and a monitoring unit;

[0018] The input terminal of the detection control unit is connected to the output terminal of the coupler, and the output terminal is connected to the monitoring unit; the detection control unit is used to calculate the standing wave ratio corresponding to the forward detection voltage and the reverse detection voltage, and output an over-standing wave protection signal to the monitoring unit when the standing wave ratio is greater than a set value;

[0019] The output of the monitoring unit is connected to the controlled terminal of the power amplifier module, and is used to control the power amplifier module to stop working when the over-standing wave protection signal is received.

[0020] Optionally, the power amplifier circuit further includes: a temperature detection module;

[0021] The output of the temperature detection module is connected to the monitoring unit, and is used to detect the temperature value of the power amplifier circuit and output it to the monitoring unit.

[0022] The monitoring unit is used to control the power amplifier module to stop working when the temperature value is greater than or equal to the set temperature value.

[0023] Optionally, the monitoring unit has an alarm output terminal, which is used to connect to an external alarm device;

[0024] The monitoring unit is also used to output corresponding fault prompt information to the external alarm device through the alarm output terminal when it receives the standing wave protection signal or when the temperature value is greater than or equal to the set temperature value.

[0025] This utility model also proposes a power amplifier, which includes the power amplifier circuit described above.

[0026] This utility model also proposes an electronic product, which includes the power amplifier circuit or the power amplifier.

[0027] This invention discloses a power amplifier, its circuit, and an electronic product. The power amplifier circuit includes a power amplification module, a coupler, and a control module. The input terminal of the power amplification module is used to receive an input signal, and the output terminal is connected to the coupler. The coupler is connected to the control module and is used to detect the forward and reverse detection voltages of the output signal of the power amplifier module and output them to the control module. The control module is connected to the controlled terminal of the power amplification module and is used to calculate the standing wave ratio (SWR) corresponding to the forward and reverse detection voltages. When the SWR exceeds a set value, the power amplifier module is controlled to stop working. This invention indirectly obtains the SWR value of the output signal of the power amplifier module through the coupler. When the SWR exceeds the standard, the power amplifier stops working, thus intervening in the temperature rise process of the power amplifier circuit in a timely manner and preventing the device from overheating. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of the power amplifier circuit of this utility model;

[0030] Figure 2 This is a schematic diagram of another embodiment of the power amplifier circuit of this utility model;

[0031] Figure 3 This is a schematic diagram of another embodiment of the power amplifier circuit of this utility model;

[0032] Figure 4This is a schematic diagram of another embodiment of the power amplifier circuit of this utility model;

[0033] Figure 5 This is a gain diagram of an embodiment of the power amplifier circuit of this utility model;

[0034] Figure 6 This is a schematic diagram of the structure of an embodiment of the power amplifier circuit of this utility model;

[0035] Figure 7 This is a schematic diagram of the temperature detection module structure of an embodiment of the power amplifier circuit of this utility model.

[0036] Explanation of icon numbers:

[0037] label name label name 10 Control module 110 Detection and control unit 20 Power amplifier module 120 monitoring unit 30 Coupler 220 Final stage amplifier unit 210 Preamplifier unit 230 drive unit

[0038] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0043] The standing wave ratio (VSWR) has a direct and critical impact on the temperature rise of power amplifiers; an excessively high VSWR is a major cause of power amplifier overheating. When the VSWR between the power amplifier and the load (such as an antenna) increases, it indicates a severe impedance mismatch. This mismatch causes some of the radio frequency signal to be reflected back to the power amplifier from the load. The reflected power cannot be absorbed by the load but is absorbed by the power amplifier's own components and converted into heat, thus raising the power amplifier's temperature.

[0044] like Figure 1 As shown, in the first embodiment of this utility model, the power amplifier circuit includes:

[0045] Power amplifier module 20, coupler 30 and control module 10;

[0046] The input terminal of the power amplifier module 20 is used to receive the input signal, and the output terminal is connected to the coupler 30; the coupler 30 is connected to the control module 10 and is used to detect the forward detection voltage and reverse detection voltage of the output signal of the power amplifier module and output them to the control module 10.

[0047] The control module 10 is connected to the controlled terminal of the power amplifier module 20 and is used to calculate the standing wave ratio (SWR) corresponding to the forward detection voltage and the reverse detection voltage. When the SWR is greater than a set value, the control module 10 controls the power amplifier module to stop working.

[0048] It is easy to understand that the power amplifier module 20 is used to amplify the power of the input signal and output the amplified signal to the load; the input terminal of the power amplifier module 20 is used to receive the input signal, and the output terminal is connected to the load; in this embodiment, a coupler 30 is used in the path between the output terminal of the power amplifier module 20 and the load. The coupler 30 is a passive device that can proportionally distribute the energy of one microwave or radio frequency signal to two or more outputs. By extracting a small portion of the reflected signal from the main transmission line through the coupler 30 (such as in a standing wave ratio monitoring scenario), parameters such as the load reflection coefficient and standing wave ratio can be calculated in conjunction with a power meter. Specifically, the coupler 30 obtains the forward detection voltage and reverse detection voltage of the output signal of the power amplifier module 20 and outputs them to the control module 10. Among them, the forward detection voltage refers to the DC voltage obtained by the coupler 30 from the output signal (the signal transmitted from the source to the load). It corresponds to the traveling wave power propagating in the forward direction in the transmission line and is a characterization of the energy emitted from the source (such as the power amplifier) ​​to the load in the system. The reverse detection voltage refers to the DC voltage obtained by the coupler 30 from the self-reflected signal (the signal returning from the load to the source). It corresponds to the energy reflected back to the source when there is a load mismatch and is a direct measure of the degree of signal reflection in the system.

[0049] The control module 10 calculates the standing wave ratios (SWRs) corresponding to the forward and reverse detection voltages. Specifically, the magnitude of the reflection coefficient Γ, |Γ|, is defined as... Where P f For incident power, P r The reflected power is the voltage. The detector voltage is proportional to the square root of the incident power or the square root of the reflected power, i.e. Therefore, the incident power and reflected power can be expressed as: P f ∝V f 2 P r ∝V r 2 Substituting the power ratio into the reflection coefficient formula, we can obtain... Furthermore, the standing wave ratio (VSWR) and the reflection coefficient have the following relationship: Furthermore, it can be seen that, Among them, V f Forward detection voltage, V r The reverse detection voltage is used. The control module 10 can calculate the standing wave ratio (VSWR) corresponding to the forward and reverse detection voltages based on the above formula. It should be noted that the above formula is common knowledge in the art and cannot be used as proof of the method steps relied upon in this utility model.

[0050] After obtaining the standing wave ratio (SWR), the control module 10 controls the power amplifier module to stop working when the SWR is greater than a set value. The set value is determined by the researchers; in one example, the set value is 4. Alternatively, the power amplifier module can be stopped from amplifying the input signal by outputting a stop command to the power amplifier module 20 or by cutting off the operating voltage of the power amplifier.

[0051] The control module 10 may include controllers such as MCU, FPGA, SOC or DSP.

[0052] This invention discloses a power amplifier circuit, comprising a power amplifier module 20, a coupler 30, and a control module 10. The input terminal of the power amplifier module 20 is used to receive an input signal, and its output terminal is connected to the coupler 30. The coupler 30 is connected to the control module 10 and is used to detect the forward and reverse detection voltages of the output signal of the power amplifier module, and output these voltages to the control module 10. The control module 10 is connected to the controlled terminal of the power amplifier module 20 and is used to calculate the standing wave ratio (SWR) corresponding to the forward and reverse detection voltages. When the SWR exceeds a set value, the power amplifier module is controlled to stop operating. This invention indirectly obtains the SWR value of the output signal of the power amplifier module 20 through the coupler 30. When the SWR exceeds the standard, the module stops operating, thus timely intervening in the temperature rise process of the power amplifier circuit and preventing device overheating.

[0053] In the second embodiment of this utility model, as Figure 2 As shown, the power amplifier module 20 further includes: a pre-amplifier unit, a final amplifier unit 220, and a drive unit 230;

[0054] The input terminal of the preamplifier unit is used to receive the input signal, and the output terminal is connected to the input terminal of the final amplifier unit 220; the output terminal of the final amplifier unit 220 is connected to the coupler 30; the input terminal of the drive unit 230 is connected to the control module 10, and the output terminal is connected to the controlled terminal of the final amplifier unit 220.

[0055] The preamplifier unit and the final amplifier unit 220 are used to amplify the power of the input signal;

[0056] The control module 10 is also used to output a shutdown command to the drive unit 230 when the standing wave ratio is greater than a set value, so that the drive unit 230 controls the final stage amplifier unit 220 to stop working.

[0057] In this embodiment, the preamplifier unit 210 and the final amplifier unit 220 jointly amplify the power of the input signal. Specifically, the output terminal of the preamplifier unit 210 is connected to the input terminal of the final amplifier unit 220. After the input signal enters the input terminal of the preamplifier unit 210, it undergoes a power amplification once, and then a second power amplification by the final amplifier unit 220. The coupler 30 detects the forward and reverse detection voltages of the output signal from the final amplifier unit 220. When the standing wave ratio (VSWR) corresponding to the forward and reverse detection voltages is greater than a set value, the control module 10 controls the final amplifier unit 220 to stop working through the drive unit 230. It is easy to understand that the drive unit 230 is used to control the final amplifier unit 220 to work or stop working, which may be achieved by outputting a corresponding signal to the enable terminal of the final amplifier unit 220, or by cutting off or restoring the operating voltage of the final amplifier unit 220.

[0058] In this embodiment, the power amplification module 20 uses a pre-amplifier unit and a final amplifier unit 220 together for power amplification. If the standing wave ratio (VSWR) is greater than a set value, this embodiment only needs to control the final amplifier unit 220 to stop working; the final amplifier unit 220 stops outputting signals. This avoids controlling multiple amplification units and eliminates the need to achieve synchronization of multiple amplification units; it is convenient and fast.

[0059] In one example, such as Figure 3 As shown, the preamplifier unit 210 includes multiple attenuators and a first-type amplifier; the multiple attenuators and the first-type amplifier are arranged in an alternating attenuator-first-type amplifier-attenuator pattern; it should be noted that, in Figure 3 and Figure 6 In the example of two attenuators and two Class I amplifiers, the same logic can be applied to arrangements of multiple attenuators and Class I amplifiers.

[0060] The final stage amplifier unit 220 includes at least one second type amplifier; the controlled terminal of the second type amplifier is connected to the drive unit 230;

[0061] The power amplifier circuit further includes a power conversion module, which is connected to multiple first-type amplifiers and at least one second-type amplifier. The power conversion module is used to connect to a power supply voltage and convert the power supply voltage into the operating voltage of the first-type amplifier and the second-type amplifier, and then output the voltage to the first-type amplifier and the second-type amplifier, respectively.

[0062] In this example, the preamplifier unit 210 is composed of multiple attenuators and a first-type amplifier connected in series in an alternating manner. The final amplifier unit 220 is composed of at least one second-type amplifier connected in series. It should be noted that the naming of the first-type amplifier and the second-type amplifier is to distinguish the amplifiers in the preamplifier unit and the amplifiers in the final amplifier unit 220. It does not imply a difference in their types.

[0063] An attenuator is a passive device used to reduce the amplitude or power of a signal. Attenuators reduce strong input signals to the safe operating range of downstream circuitry (such as amplifiers and ADCs), preventing distortion or device damage due to signal overload. When a system is connected to a strong signal source (such as a high-power transmitter), the attenuator acts as a "buffer" to reduce the input power of downstream devices (such as low-noise amplifiers), preventing thermal damage or breakdown.

[0064] Arranging attenuators and Class 1 amplifiers alternately allows the attenuator to attenuate strong signals first when the input signal power fluctuates significantly, preventing subsequent amplifiers from entering saturation. For strong input signals: the attenuator reduces the power first, then the amplifier amplifies it to a suitable level, preventing amplifier overload. For weak input signals: the attenuation is reduced or the attenuator is bypassed, allowing the amplifier to directly boost the signal gain. Assuming the linear dynamic range of a single amplifier is (D_1) and the adjustable attenuation of the attenuator is A, the dynamic range of the alternating structure can be extended to (D_1+A), thus adapting to a wider range of input power. Furthermore, while amplifiers themselves have high linearity, a single amplifier can still generate harmonic distortion under large signals. By alternating the "attenuator + amplifier" arrangement, large signals can be processed in segments. Specifically, the attenuator first reduces the signal amplitude to the amplifier's linear range, then amplifies it back to the target level, preventing nonlinear distortion caused by overload in a single amplifier. The preamplifier unit 210, which consists of an attenuator and a first-class amplifier connected in series alternately, essentially achieves an optimized balance between dynamic range, linearity, noise performance, and reliability through a cascaded "attenuation-amplification" structure. It is especially suitable for RF and microwave systems with large input signal power fluctuations and high linearity requirements.

[0065] The power conversion module is connected to a power supply voltage, which can be AC ​​mains or DC power. It converts the power supply voltage into the operating voltages of the first and second type amplifiers, and then outputs the voltages to the first and second type amplifiers respectively. It should be noted that, since the first and second type amplifiers in this invention are only used to identify the pre-amplification unit or the final amplification unit 220, the operating voltages of the first and second type amplifiers may be the same or different; the operating voltages of multiple first type amplifiers may be the same or different, and the operating voltages of multiple second type amplifiers may be the same or different. In one feasible example, the power conversion module may include a low-dropout linear regulator. The low-dropout linear regulator converts the DC voltage into the operating voltages of each amplifier and then outputs the voltages to each amplifier respectively.

[0066] The final stage amplifier unit 220 includes at least one type-2 amplifier, which can reduce distortion through "piecewise linearization".

[0067] In one embodiment, the 1dB compression point output power of the second type of amplifier is less than or equal to a set value.

[0068] It should be noted that when the amplifier's input power increases to a certain value, its output power no longer increases linearly with the input power, but instead begins to exhibit a "compression" phenomenon. The output power corresponding to a 1dB decrease in gain relative to the linear gain is called the 1dB compression point output power (P1dB).

[0069] It is easy to understand that when the signal power output from the preamplifier unit to the final amplifier unit 220 is too high, it causes over-excitation of the second-type amplifier, which may result in excessive output signal power and distortion. Alternatively, when the final amplifier unit 220 has multiple second-type amplifiers, if the input signal power received by the second-type amplifier connected to the coupler 30 is too high, it will cause over-excitation, potentially leading to severe amplifier overheating and output signal distortion. To avoid these problems, this embodiment sets a 1dB compression point output power for the second-type amplifier, which is the maximum output power value of the second-type amplifier. When the input signal is too high and over-excitation occurs, the maximum output power of the second-type amplifier is the set value. This avoids amplifier overheating and output signal distortion. The set value is determined by the researchers.

[0070] like Figure 4 and Figure 5 As shown, when the input signal is greater than 10dBm, the normal output power of the second type amplifier in the final stage power amplification unit is at the rated power.

[0071] In one example, the second type of amplifier includes a power amplifier tube of model MJ1505, which amplifies signals in the 15-1000MHz frequency band; it can cover a sufficiently wide bandwidth and maintain a flat gain within the ultra-wide 15-1000MHz frequency band. Based on this, the power amplifier circuit proposed in this invention has a wideband response function.

[0072] In the third embodiment of this utility model, as Figure 6 As shown, the control module 10 includes: a detection control unit 110 and a monitoring unit 120;

[0073] The input terminal of the detection control unit 110 is connected to the output terminal of the coupler 30, and the output terminal is connected to the monitoring unit 120. The detection control unit 110 is used to calculate the standing wave ratio corresponding to the forward detection voltage and the reverse detection voltage, and output an over-standing wave protection signal to the monitoring unit 120 when the standing wave ratio is greater than a set value.

[0074] The output of the monitoring unit 120 is connected to the controlled terminal of the power amplifier module 20, and is used to control the power amplifier module to stop working when the over-standing wave protection signal is received.

[0075] It should be noted that the input terminal of the detection control unit 110 is connected to the output terminal of the coupler 30, receiving the forward detection voltage and the reverse detection voltage output by the coupler 30, and calculating the corresponding standing wave ratio (SWR). When the SWR exceeds a set value, an over-SWR protection signal is output to the monitoring unit 120. It is easy to understand that the monitoring unit 120 should be able to monitor multiple parameters affecting the power amplifier circuit. In this embodiment, the detection control unit 110 is specifically used to detect the SWR, and when the SWR exceeds the standard, it outputs an over-SWR signal to the monitoring unit 120, which reduces the burden on the monitoring unit 120 and avoids the problem of excessive processing time caused by the monitoring unit 120 performing a large number of calculations.

[0076] The output of the monitoring unit 120 is connected to the controlled terminal of the power amplifier module 20, and is used to control the power amplifier module to stop working when the over-standing wave protection signal is received.

[0077] The power amplifier circuit also includes: a temperature detection module;

[0078] The output terminal of the temperature detection module is connected to the monitoring unit 120, and is used to detect the temperature value of the power amplifier circuit and output it to the monitoring unit 120.

[0079] The monitoring unit 120 is used to control the power amplifier module to stop working when the temperature value is greater than or equal to the set temperature value.

[0080] The temperature detection module acquires the temperature value of the power amplifier circuit and outputs it to the monitoring unit 120, which then determines whether the temperature exceeds the limit. If the temperature exceeds the limit, the power amplifier module is controlled to stop working.

[0081] In one example, such as Figure 7 As shown, the temperature detection module includes an NST235 temperature sensor, a first capacitor, a second capacitor, and a first resistor. The power supply terminal of the temperature sensor is connected to the operating voltage and grounded through the first capacitor. The ground terminal of the temperature sensor is grounded, the voltage output terminal is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the second capacitor and grounded through the second capacitor, and the second terminal of the first resistor is connected to the monitoring unit 120. The temperature sensor is used to output the temperature value to the monitoring unit 120 through the first resistor.

[0082] The monitoring unit 120 has an alarm output terminal, which is used to connect to an external alarm device.

[0083] The monitoring unit 120 is also used to output corresponding fault prompt information to the external alarm device through the alarm output terminal when it receives the standing wave protection signal or when the temperature value is greater than or equal to the set temperature value.

[0084] It is easy to understand that when the power amplifier circuit temperature or VSWR exceeds the limit (power amplifier failure), the monitoring unit 120 can promptly issue fault warning information to help users or relevant personnel understand that the power amplifier circuit has failed and the type of failure. The fault warning information can be used to identify excessive temperature and / or excessive VSWR.

[0085] The external warning device can be a display screen or a speaker.

[0086] This utility model also proposes a power amplifier, which includes the power amplifier circuit described above.

[0087] This utility model also proposes an electronic product, which includes the power amplifier circuit or power amplifier. It is readily understood that the power amplifier circuit or power amplifier is applied to the resistor product.

[0088] The specific structure of the power amplifier circuit is as described in the above embodiments. Since this power amplifier or electronic product adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be repeated here. The above descriptions are only optional embodiments of this utility model and do not limit the patent scope of this utility model. All equivalent structural transformations made under the concept of this utility model using the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A power amplifier circuit, characterized by, The power amplifier circuit includes: Power amplifier module, coupler and control module; The input terminal of the power amplifier module is used to receive the input signal, and the output terminal is connected to the coupler; the coupler is connected to the control module and is used to detect the forward and reverse detection voltages of the output signal of the power amplifier module and output them to the control module. The control module is connected to the controlled terminal of the power amplifier module and is used to calculate the standing wave ratio (SWR) corresponding to the forward detection voltage and the reverse detection voltage. When the SWR is greater than a set value, the control module stops working.

2. The power amplifier circuit of claim 1, wherein, The power amplifier module further includes: a pre-amplifier unit, a final amplifier unit, and a driver unit; The input terminal of the preamplifier unit is used to receive the input signal, and the output terminal is connected to the input terminal of the final amplifier unit; the output terminal of the final amplifier unit is connected to the coupler; the input terminal of the drive unit is connected to the control module, and the output terminal is connected to the controlled terminal of the final amplifier unit. The preamplifier unit and the final amplifier unit are used to amplify the power of the input signal; The control module is also used to output a shutdown command to the drive unit when the standing wave ratio is greater than a set value, so that the drive unit controls the final stage amplification unit to stop working.

3. The power amplifier circuit of claim 2, wherein, The preamplifier unit includes multiple attenuators and a first-type amplifier; the multiple attenuators and the first-type amplifier are arranged in an alternating pattern of attenuator-first-type amplifier-attenuator; The final stage amplification unit includes at least one type II amplifier; the controlled terminal of the type II amplifier is connected to the driving unit. The power amplifier circuit further includes a power conversion module, which is connected to multiple first-type amplifiers and at least one second-type amplifier. The power conversion module is used to connect to a power supply voltage and convert the power supply voltage into the operating voltage of the first-type amplifier and the second-type amplifier, and then output the voltage to the first-type amplifier and the second-type amplifier, respectively.

4. The power amplifier circuit of claim 3, wherein, The output power at the 1dB compression point of the second type of amplifier is less than or equal to the set value.

5. The power amplifier circuit of claim 3, wherein, The second type of amplifier includes a power amplifier tube of model MJ1505, which amplifies signals in the 15-1000MHz frequency band.

6. The power amplifier circuit of any one of claims 1 to 5, wherein, The control module includes: a detection control unit and a monitoring unit; The input terminal of the detection control unit is connected to the output terminal of the coupler, and the output terminal is connected to the monitoring unit; the detection control unit is used to calculate the standing wave ratio corresponding to the forward detection voltage and the reverse detection voltage, and output an over-standing wave protection signal to the monitoring unit when the standing wave ratio is greater than a set value; The output of the monitoring unit is connected to the controlled terminal of the power amplifier module, and is used to control the power amplifier module to stop working when the over-standing wave protection signal is received.

7. The power amplifier circuit of claim 6, wherein, The power amplifier circuit also includes: a temperature detection module; The output of the temperature detection module is connected to the monitoring unit, and is used to detect the temperature value of the power amplifier circuit and output it to the monitoring unit. The monitoring unit is used to control the power amplifier module to stop working when the temperature value is greater than or equal to the set temperature value.

8. The power amplifier circuit of claim 7, wherein, The monitoring unit has an alarm output terminal, which is used to connect to an external alarm device. The monitoring unit is also used to output corresponding fault prompt information to the external alarm device through the alarm output terminal when it receives the standing wave protection signal or when the temperature value is greater than or equal to the set temperature value.

9. A power amplifier, characterized by The power amplifier includes the power amplifier circuit as described in any one of claims 1 to 8.

10. An electronic product, characterized by comprising: The electronic product includes the power amplifier circuit as described in any one of claims 1 to 8 or the power amplifier as described in claim 9.

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