Radio frequency power supply protection circuit and wireless communication device

Abstract

Embodiments of the present application disclose a radio frequency power supply protection circuit and a wireless communication device. The radio frequency power supply protection circuit comprises a radio frequency power supply module, a power supply protection module and an external device; the power supply protection module comprises a protection module and a control module; the protection module is connected to the control module; the radio frequency power supply module is connected to the protection module, the control module and the external device; the radio frequency power supply module is used for converting a direct current into a radio frequency alternating current signal, and outputs the radio frequency alternating current signal to the external device; the protection module is used for outputting a first comparison result to the control module when it is detected that the offset angle of the current is greater than a preset angle; the control module is used for, when the first comparison result is detected, executing a step-down operation on a direct-current voltage to reduce the reflected power of the radio-frequency power supply module. According to the present application, the direct-current voltage of a radio frequency power supply is limited by detecting the offset angle of the current, so that the reflected power is within a preset range, thereby protecting the radio frequency power supply and improving the stability of wireless communication.

Description

RF power supply protection circuit and wireless communication equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 21, 2023, with application number 2023117635735 and application name “RF Power Supply Protection Circuit and Wireless Communication Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless communication network technology in the Internet industry, and specifically to a radio frequency power supply protection circuit and a wireless communication device. Background Art

[0003] With the growing demands of the information society, radio frequency (RF) communication, a communication method that transmits information via radio waves, has been widely used in modern society, including radio broadcasting, wireless communication networks, and mobile communications. In RF communication, RF power supplies are often used to power network communication equipment.

[0004] However, during the use of RF power supply, the RF power supply will generate reflected power. If the reflected power is too large, the power supply part will be out of control, causing damage to the circuit, and thus affecting the normal operation of the entire system.

[0005] Summary of the Invention

[0006] The technical problem to be solved by this application is to address the deficiencies in the above-mentioned prior art. A radio frequency power supply protection circuit and a wireless communication device are disclosed. By detecting the offset angle of the current in the radio frequency power supply module, the DC voltage of the radio frequency power supply is limited so that the reflected power is within a preset range, thereby protecting the radio frequency power supply and improving the stability of wireless communication.

[0007] In a first aspect, the present application provides a radio frequency power supply protection circuit, comprising: a radio frequency power supply module, a power supply protection module, and an external device;

[0008] The power protection module includes a protection module and a control module, and the protection module is connected to the control module; and the RF power supply module is connected to the protection module, the control module, and the external device;

[0009] The RF power supply module is configured to convert an input DC current into a RF AC signal; and output the RF AC signal to the external device;

[0010] The protection module is configured to output a first comparison result to the control module when detecting that the deviation angle of the current in the RF power module is greater than a preset angle;

[0011] The control module is configured to, upon receiving the first comparison result, perform a voltage reduction operation on the DC voltage in the RF power module to reduce the reflected power of the RF power module.

[0012] In a possible embodiment, the protection module includes a first resistor, an impedance device, and a comparator; the first resistor and the impedance device are connected in parallel, the first end of the first resistor and the first end of the impedance device are connected to the RF power supply module, the second end of the first resistor is connected to the negative input terminal of the comparator, the second end of the impedance device is connected to the positive input terminal of the comparator, and the output terminal of the comparator is connected to the control module.

[0013] In a possible embodiment, the comparator is used to collect a reference voltage value corresponding to the first resistor and a reference current value corresponding to the impedance device; and to determine the offset angle based on the reference voltage value and the reference current value; and when the offset angle is greater than the preset angle, output the first comparison result.

[0014] In a possible embodiment, the protection module further includes a second resistor and a third resistor; the first end of the second resistor is connected to the second end of the first resistor and the negative input terminal of the comparator, and the second end of the second resistor is connected to the ground; the first end of the third resistor is connected to the second end of the impedance device and the positive input terminal of the comparator, and the second end of the third resistor is connected to the ground.

[0015] In a possible embodiment, the impedance component is a first inductor or a fourth resistor.

[0016] In a possible embodiment, the RF power supply module includes a RF module, a DC power supply, a second inductor, and a fifth resistor; the positive pole of the DC power supply is connected to the first end of the RF module, the second end of the RF module is connected to the first end of the power protection module and the input end of the external device, the second end of the power protection module is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second inductor, and the second end of the second inductor is connected to the negative pole of the DC power supply.

[0017] In a possible embodiment, the control module includes a reflected power detection circuit and a voltage regulation module; the voltage regulation module includes a controller and a voltage regulation circuit; the first end of the reflected power detection circuit is connected to the protection module, the second end of the reflected power detection circuit is connected to the first end of the controller, the second end of the controller is connected to the controlled end of the voltage regulation circuit, the input end of the voltage regulation circuit is connected to the positive pole of the DC power supply, and the output end of the voltage regulation circuit is connected to the first end of the radio frequency module.

[0018] In one possible embodiment, the reflected power detection circuit is used to detect the reflected power of the RF power module; the controller is used to respond to the first comparison result and determine a power difference between the reflected power and the preset power; and determine a voltage drop value based on the power difference; and output the control instruction based on the voltage drop value; the voltage regulation circuit is used to respond to the control instruction to adjust the DC voltage based on the voltage drop value and the current voltage value.

[0019] In a possible embodiment, when the protection module detects that the offset angle of the current is less than or equal to the preset angle, the protection module outputs a second comparison result to the control module; and when the control module receives the second comparison result sent by the protection module, the control instruction is not output.

[0020] In a second aspect, the present application provides a wireless communication device, comprising the radio frequency power supply protection circuit disclosed in the first aspect of the present application.

[0021] It can be seen that the above-mentioned RF power supply protection circuit and wireless communication equipment, by adding a protection module and a control module on the basis of the RF power supply module, detects the offset angle of the current in the RF power supply module through the protection module. When the offset angle is too large, the control module is started to reduce the DC voltage in the RF power supply module to avoid power supply damage caused by excessive reflected power, thereby improving the stability of the RF power supply protection circuit in wireless communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] FIG1 is a schematic diagram of a radio frequency power supply protection circuit provided in an embodiment of the present application;

[0024] FIG2 is a structural block diagram of a protection module provided in an embodiment of the present application;

[0025] FIG3 is a structural block diagram of another protection module provided in an embodiment of the present application;

[0026] FIG4 is a structural block diagram of a radio frequency power supply module provided in an embodiment of the present application;

[0027] FIG5 is a structural block diagram of a control module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0030] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the embodiments of this application, "and / or" describes the relationship between associated objects and indicates that three relationships can exist. For example, "A and / or B" can represent the following three situations: A exists alone; A and B exist simultaneously; and B exists alone. A and B can be singular or plural.

[0032] In the embodiments of the present application, the symbol " / " can indicate that the preceding and following objects are in an "or" relationship. In addition, the symbol " / " can also represent a division sign, that is, performing a division operation. For example, A / B can mean A divided by B.

[0033] In the embodiments of the present application, "at least one item" or similar expressions refers to any combination of these items, including any combination of single items or plural items, and refers to one or more, and multiple refers to two or more. For example, at least one item (item) of a, b, or c can represent the following seven situations: a, b, c, a and b, a and c, b and c, a, b, and c. Among them, each of a, b, and c can be an element or a set containing one or more elements.

[0034] In the embodiments of this application, "equal to" can be used in conjunction with "greater than" to apply to the technical solution adopted when "greater than" is used, and can also be used in conjunction with "less than" to apply to the technical solution adopted when "less than" is used. When "equal to" is used in conjunction with "greater than", it should not be used in conjunction with "less than"; when "equal to" is used in conjunction with "less than", it should not be used in conjunction with "greater than".

[0035] The embodiments of the present application are described below with reference to the accompanying drawings.

[0036] Please refer to FIG1 , which is a schematic diagram of a radio frequency power supply protection circuit provided in an embodiment of the present application. As shown in FIG1 , the radio frequency power supply protection circuit 10 includes a radio frequency power supply module 110 , a power supply protection module 120 , and an external device 130 ;

[0037] The power protection module 120 includes a protection module 121 and a control module 122, and the protection module 121 and the control module 122 are connected; and the RF power module 110 is connected to the protection module 121, the control module 122, and the external device 130;

[0038] The RF power module 110 is configured to convert an input DC current into a RF AC signal; and output the RF AC signal to the external device 130;

[0039] The protection module 121 is configured to output a first comparison result to the control module 122 when detecting that the deviation angle of the current in the RF power module 110 is greater than a preset angle;

[0040] The control module 122 is configured to, upon receiving the first comparison result, perform a voltage reduction operation on the DC voltage in the RF power module 110 to reduce the reflected power of the RF power module 110 .

[0041] It can be seen that, on the basis of the RF power supply module, the present application adds a power supply protection module, namely a protection module and a control module. Among them, the protection module can detect the offset angle of the current in its circuit when the RF power supply module is in working state. If there is an offset angle greater than a preset angle, it means that the transmission power of the circuit in the RF power supply module is too large. At this time, there may be a situation where the reflected power is too large, so further detection is required. The protection module outputs a first comparison result to the control module to characterize the situation where the offset angle is greater than the preset angle. After detecting the first comparison result, the control module will control the DC voltage of the RF power supply module to perform a step-down operation to reduce the reflected power, so that the reflected power of the RF power supply module is always within the preset range, thereby realizing the function of protecting the RF power supply.

[0042] In a possible embodiment, based on the above-mentioned RF power supply protection circuit schematic, please refer to Figure 2. Figure 2 is a structural block diagram of a protection module provided in an embodiment of the present application, and the protection module is the protection module 121 in the above-mentioned RF power supply protection circuit 10, which includes a first resistor R1, an impedance device Z and a comparator (Comparator, CMP); the first resistor R1 and the impedance device Z are connected in parallel, the first end of the first resistor R1 and the first end of the impedance device Z are connected to the RF power supply module, the second end of the first resistor R1 is connected to the negative input terminal of the comparator CMP, the second end of the impedance device Z is connected to the positive input terminal of the comparator CMP, and the output terminal of the comparator CMP is connected to the control module.

[0043] In which, the current flows from the RF power supply module to the first end (i.e., the input end) of R1 and the first end (i.e., the input end) of Z, and then the current flows from the output ends of R1 and Z to the comparator, wherein the second end of R1 is connected to the negative input end of the comparator, and the second end of Z is connected to the positive input end of the comparator. Then, the comparator will output a first comparison result to the control module to indicate that the offset angle of the current of the two branches is greater than the preset angle.

[0044] In one possible embodiment, based on the structural block diagram of the above-mentioned protection module, the comparator is used to collect a reference voltage value corresponding to the first resistor and a reference current value corresponding to the impedance device; and, determine the offset angle based on the reference voltage value and the reference current value; and, when the offset angle is greater than the preset angle, output the first comparison result.

[0045] Here, the impedance device means a device that has the ability to block "electricity" (impedance, capacitance, inductance). Therefore, the impedance device is the first inductor or the fourth resistor, which is not limited here.

[0046] Since the RF power supply converts input DC power into high-frequency AC power, the current in the protection circuit is AC current and the input voltage is AC voltage. Since R1 and Z are connected in parallel, the AC voltage at both ends is the same. Since AC voltage refers to the voltage whose direction and magnitude of the current change periodically at a certain frequency, it is calculated according to the following formula:

[0047] U=UoCOS(wt).

[0048] Where Uo is the peak voltage (or amplitude), w is the angular frequency, and t is time.

[0049] Similarly, the current of R1 and Z is calculated according to the following formula:

[0050] Where Io is the peak current (or amplitude), w is the angular frequency, and t is the time. is the phase angle.

[0051] The comparator collects the voltage U1 of R1 and the current I2 of Z, and then calculates the phase angle according to the above voltage calculation formula and current calculation formula. The absolute value of the phase angle is the offset angle. If the offset angle is greater than the preset angle The protection module outputs the first comparison result to the control module.

[0052] In one possible embodiment, please refer to Figure 3, which is a structural block diagram of another protection module provided in an embodiment of the present application. As shown in Figure 3, the protection module further includes a second resistor R2 and a third resistor R3; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the negative input terminal of the comparator, and the second end of the second resistor R2 is connected to the ground line GND1; the first end of the third resistor R3 is connected to the second end of the impedance device Z and the positive input terminal of the comparator, and the second end of the third resistor R3 is connected to the ground line GND2.

[0053] Grounding is an electrical connection that connects electrical equipment to the ground or earth. It is also an important safety measure. Its primary function is to ensure the safety of equipment and personnel, preventing personal injury or equipment failure caused by equipment leakage or increased ground potential.

[0054] The second and third resistors are grounding resistors. Because the earth's resistance can reach several thousand ohms, while the leakage potential is typically only a few hundred volts, the grounding resistor's value is typically very small, generally below 1 ohm. Grounding resistors not only ensure the safety of personnel and equipment, but also serve the following functions: 1. Reduce ground current: When a leakage current occurs in equipment, the leakage current is dissipated through the grounding wire. Excessive leakage current can pose a risk to personnel and affect the normal operation of the equipment. Grounding resistors can reduce the magnitude of the grounding current, thereby minimizing the risk to personnel and equipment. 2. Control the rate of rise of the ground potential: When leakage current is dissipated through the grounding wire, a ground potential is generated. If this potential rises too quickly, it can impact or even damage the equipment. Grounding resistors can control the rate of rise of the ground potential, slowing it down and avoiding any impact on the equipment. 3. Filtering: Grounding resistors can provide a filtering effect, suppressing high-frequency electromagnetic interference and improving the system's anti-interference capability.

[0055] In one possible embodiment, please refer to Figure 4, which is a structural block diagram of a radio frequency power supply module provided in an embodiment of the present application. As shown in Figure 4, the radio frequency power supply module includes a radio frequency module, a direct current power supply DC, a second inductor L2, and a fifth resistor R5; the positive pole of the direct current power supply DC is connected to the first end of the radio frequency module, the second end of the radio frequency module is connected to the first end of the power protection module and the input end of the external device, the second end of the power protection module is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected to the first end of the second inductor L2, and the second end of the second inductor L2 is connected to the negative pole of the direct current power supply DC.

[0056] The purpose of the second inductor and the fifth resistor in series in the circuit is that when a natural response exists in the circuit, the series circuit of the inductor and resistor is very suitable. The inductor's ability to store energy enables it to respond to the natural response, and the resistor can reduce the resistor's sensitivity to external interference. In addition, because the function of the RF power supply is to output high-frequency AC power, the RL series circuit can produce a faster response at high frequencies and better cope with high-frequency interference. In addition, the RL series circuit can also be used in a tuned circuit. When using the appropriate inductor and resistor combination, the RL series circuit can be made to respond to a specific frequency range.

[0057] An RF power module is a power supply device used to supply RF signals. The main principle of an RF power module, such as the one shown in Figure 4, is to convert DC power into an RF AC signal and output it to the load (i.e., an external device). The operating principle of an RF power supply can be roughly divided into three steps: DC power conversion, RF signal generation, and output regulation.

[0058] Furthermore, DC power conversion is the process of converting the DC power input by a DC power supply into an RF AC signal. The DC power supply is responsible for converting the input DC power into a stable DC power supply and converting it into a high-frequency pulse signal through switching power supply technology. The RF power amplifier in the RF module is responsible for amplifying the high-frequency pulse signal into an RF AC signal. RF signal generation relies on the RF oscillator in the RF module to generate the RF signal. As a circuit capable of generating a stable RF signal, the RF oscillator is usually composed of an oscillation circuit and a feedback circuit. The oscillation circuit is responsible for generating the RF signal, while the feedback circuit is responsible for feeding back a portion of the output signal to the oscillation circuit to maintain the stability of the oscillation. Finally, output regulation is the process of adjusting the RF signal to a form suitable for the load (i.e., the external device) through the output matching network in the RF module. The output matching network is responsible for adjusting the impedance of the output signal to match the impedance of the load.

[0059] In one possible embodiment, please refer to Figure 5, which is a structural block diagram of a control module provided in an embodiment of the present application. As shown in Figure 5, the control module 122 includes a reflected power detection circuit 510 and a voltage regulation module 520; the voltage regulation module includes a controller 521 and a voltage regulation circuit 522; the first end of the reflected power detection circuit 510 is connected to the protection module, the second end of the reflected power detection circuit 510 is connected to the first end of the controller 521, the second end of the controller 521 is connected to the controlled end of the voltage regulation circuit 522, the input end of the voltage regulation circuit 522 is connected to the positive pole of the DC power supply, and the output end of the voltage regulation circuit 522 is connected to the first end of the RF module.

[0060] In one possible embodiment, based on the structural block diagram of the above-mentioned control module, the reflected power detection circuit is used to detect the reflected power of the RF power module; the controller is used to respond to the first comparison result and determine a power difference between the reflected power and the preset power; and determine a voltage drop value based on the power difference; and output the control instruction based on the voltage drop value; the voltage regulation circuit is used to respond to the control instruction to adjust the DC voltage based on the voltage drop value and the current voltage value.

[0061] Among them, when the control module receives the first comparison result sent by the protection module, it will determine the part of the reflected power that exceeds the preset range, and based on this, determine the voltage drop value that needs to be reduced, and then reduce the DC voltage input to the RF power supply module through the voltage regulation circuit in response to the output control instruction.

[0062] In a possible embodiment, when the protection module detects that the offset angle of the current is less than or equal to the preset angle, the protection module outputs a second comparison result to the control module; and when the control module receives the second comparison result sent by the protection module, the control instruction is not output.

[0063] Among them, when the offset angle of the AC current in the RF power module is small, that is, less than or equal to the preset angle, it means that the RF transmission power in the circuit is not very large, which means that there is no need to step down the DC voltage input into the RF power module. Therefore, after receiving the second comparison result, the control module does not need to output a control instruction.

[0064] It can be seen that the RF power supply protection circuit provided in any of the above embodiments disclosed in the present application can limit the DC voltage of the RF power supply by detecting the offset angle of the current so that the reflected power is within a preset range, thereby protecting the RF power supply and improving the stability of wireless communication.

[0065] In a possible embodiment, an embodiment of the present application provides a wireless communication device, which includes the radio frequency power supply protection circuit provided by any of the above-mentioned application embodiments.

[0066] Among them, the radio frequency power supply protection circuit in the wireless communication device is the same as the radio frequency power supply protection circuit described in any of the above-mentioned application embodiments and will not be described again here. It should be noted that for the aforementioned application embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited to the described order of actions, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for this application.

[0067] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0069] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0071] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A radio frequency power supply protection circuit, characterized in that: include: RF power module, power protection module and external equipment; The power protection module includes a protection module and a control module, wherein the protection module is connected to the control module; and the RF power supply module is connected to the protection module, the control module and the external device; The radio frequency power supply module is used to convert the input direct current into a radio frequency alternating current signal; and, outputting the radio frequency AC signal to the external device; The protection module is configured to output a first comparison result to the control module when detecting that the deviation angle of the current in the RF power module is greater than a preset angle; The control module is configured to, when receiving the first comparison result, perform a voltage reduction operation on a DC voltage in the RF power module to reduce the reflected power of the RF power module.

2. The radio frequency power supply protection circuit according to claim 1, characterized in that: The protection module includes a first resistor, an impedance device and a comparator; The first resistor and the impedance device are connected in parallel, the first end of the first resistor and the first end of the impedance device are connected to the RF power supply module, the second end of the first resistor is connected to the negative input terminal of the comparator, the second end of the impedance device is connected to the positive input terminal of the comparator, and the output terminal of the comparator is connected to the control module.

3. The radio frequency power supply protection circuit according to claim 2, characterized in that: The comparator is used to collect a reference voltage value corresponding to the first resistor and a reference current value corresponding to the impedance device; and, determining the offset angle according to the reference voltage value and the reference current value; And, when the offset angle is greater than the preset angle, the first comparison result is output.

4. The radio frequency power supply protection circuit according to claim 2, characterized in that: The protection module also includes a second resistor and a third resistor; The first end of the second resistor is connected to the second end of the first resistor and the negative input terminal of the comparator, and the second end of the second resistor is connected to the ground line; The first end of the third resistor is connected to the second end of the impedance device and the positive input terminal of the comparator, and the second end of the third resistor is connected to the ground line.

5. The radio frequency power supply protection circuit according to claim 2, characterized in that: The impedance device is a first inductor or a fourth resistor.

6. The radio frequency power supply protection circuit according to claim 1, characterized in that: The radio frequency power supply module includes a radio frequency module, a direct current power supply, a second inductor, and a fifth resistor; The positive electrode of the DC power supply is connected to the first end of the RF module, the second end of the RF module is connected to the first end of the power protection module and the input end of the external device, the second end of the power protection module is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the first end of the second inductor, and the second end of the second inductor is connected to the negative electrode of the DC power supply.

7. The radio frequency power supply protection circuit according to claim 6, characterized in that: The control module includes a reflected power detection circuit and a voltage regulation module; The voltage regulation module includes a controller and a voltage regulation circuit; The first end of the reflected power detection circuit is connected to the protection module, the second end of the reflected power detection circuit is connected to the first end of the controller, the second end of the controller is connected to the controlled end of the voltage regulation circuit, the input end of the voltage regulation circuit is connected to the positive pole of the DC power supply, and the output end of the voltage regulation circuit is connected to the first end of the RF module.

8. The radio frequency power supply protection circuit according to claim 7, characterized in that: The reflected power detection circuit is used to detect the reflected power of the radio frequency power module; The controller is configured to determine a power difference value according to the reflected power and a preset power in response to the first comparison result; and, determining a voltage drop value according to the power difference; And, outputting a control instruction according to the voltage drop value; The voltage regulating circuit is used to respond to the control instruction to adjust the DC voltage according to the voltage drop value and the current voltage value.

9. The radio frequency power supply protection circuit according to claim 8, characterized in that: When the protection module detects that the deviation angle of the current is less than or equal to the preset angle, outputting a second comparison result to the control module; and When the control module receives the second comparison result sent by the protection module, it does not output the control instruction.

10. A wireless communication device, characterized in that: It comprises a radio frequency power supply protection circuit as described in any one of claims 1 to 9.

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