Radio frequency power amplifier protection device and radio frequency power supply equipment

Abstract

The invention provides a radio frequency power amplifier protection device and radio frequency power supply equipment. The radio frequency power amplifier protection device comprises a reflection power determination unit, a comparison unit and a control unit, the reflection power determination unit is used for acquiring a reflection coefficient module value and an output voltage value at the output end of the radio frequency power amplifier when the radio frequency power amplifier outputs the radio frequency signal to the load, and determining a reflection power value when the radio frequency power amplifier transmits the radio frequency signal to the load at least according to the reflection coefficient module value and the output voltage value; the comparison unit is used for receiving the reflection power value and at least comparing the reflection power value with a first preset value to obtain a first comparison result signal; the control unit is used for receiving the first comparison result signal and controlling the radio frequency power amplifier to be in a corresponding working state at least according to the first comparison result signal; wherein the working state of the radio frequency power amplifier at least comprises a first power output state and a stop output state. According to the invention, the radio frequency power amplifier can be protected.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a radio frequency power amplifier protection device and a radio frequency power supply device. Background Art

[0002] At present, with the development of radio frequency technology, radio frequency power amplifiers are often used to amplify the power of crystal oscillator signals, and transmit the amplified radio frequency signals to loads to provide power to various loads. However, radio frequency power amplifiers have strict requirements on the working environment and are easily defeated by reflected power when the working environment changes. Therefore, how to protect radio frequency power amplifiers and prevent them from being defeated by reflected power has become a problem that needs to be considered. Summary of the invention

[0003] The present application provides a radio frequency power amplifier protection device and a radio frequency power supply device, which can protect a radio frequency power amplifier.

[0004] In a first aspect, a radio frequency power amplifier protection device is provided, the radio frequency power amplifier protection device comprising a reflected power determination unit, a comparison unit and a control unit. The reflected power determination unit is used to be connected to the output end of the radio frequency power amplifier to obtain the reflection coefficient modulus and output voltage value at the output end of the radio frequency power amplifier when the radio frequency power amplifier outputs the radio frequency signal to the load, and at least determine the reflected power value when the radio frequency power amplifier transmits the radio frequency signal to the load according to the reflection coefficient modulus and the output voltage value. The comparison unit is connected to the reflected power determination unit, the comparison unit is used to receive the reflected power value, and at least compare the reflected power value with a first preset value to obtain a first comparison result signal. The control unit is connected to the comparison unit, the control unit is used to receive the first comparison result signal, and at least control the radio frequency power amplifier to be in a corresponding working state according to the first comparison result signal; wherein the working state of the radio frequency power amplifier includes at least a first power output state and a stop output state.

[0005] In a possible implementation manner, the comparison unit is used to obtain the first comparison result signal that is continuously at a high level when the reflected power value is greater than the first preset value, and to obtain the first comparison result signal that is continuously at a low level when the reflected power value is less than the first preset value. The control unit is used to control the RF power amplifier to be in a stop output state when the first comparison result signal is at a high level, and to control the RF power amplifier to be in the first power output state when the first comparison result signal is at a low level.

[0006] In a possible implementation, the working state of the RF power amplifier also includes a second power output state, and the power value of the RF signal output by the RF power amplifier when in the second power output state is greater than the power value of the RF signal output when in the first power output state. The comparison unit is also used to compare the reflected power value with a second preset value to obtain a second comparison result signal, wherein the second preset value is less than the first preset value. The control unit is also used to receive the second comparison result signal, and control the RF power amplifier to be in a corresponding working state according to the first comparison result signal and the second comparison result signal.

[0007] In a possible implementation manner, when the reflected power value is greater than the second preset value, the second comparison result signal obtained by the comparison unit is continuously at a high level, and when the reflected power value is less than the second preset value, the second comparison result signal obtained by the comparison unit is continuously at a low level. The control unit is configured to control the RF power amplifier to be in the first power output state when the first comparison result signal is at a low level and the second comparison result signal is at a high level, and to control the RF power amplifier to be in the second power output state when the first comparison result signal is at a low level and the second comparison result signal is at a low level.

[0008] In a possible implementation, the comparison unit includes a first comparison module and a second comparison module. The first input end of the first comparison module is connected to the reflected power determination unit to receive the reflected power value, the second input end of the first comparison module is used to receive the first preset value, and the first output end of the first comparison module is connected to the control unit to output the first comparison result signal obtained by comparing the reflected power value with the first preset value. The third input end of the second comparison module is connected to the reflected power determination unit to receive the reflected power value, the fourth input end of the second comparison module is used to receive the second preset value, and the second output end of the second comparison module is connected to the control unit to output the second comparison result signal obtained by comparing the reflected power value with the second preset value.

[0009] In a possible implementation, the two input terminals of the RF power amplifier are used to input a DC voltage and a crystal oscillator signal respectively, and the crystal oscillator signal is power-amplified according to the voltage value of the DC voltage to obtain a RF signal with a target power value, wherein the target power value is related to the voltage value of the DC voltage. The control unit is used to control and adjust the voltage value of the DC voltage at least according to the first comparison result signal, so that the target power value of the RF signal obtained after power amplification changes according to the change of the voltage value of the DC voltage, so that the RF power amplifier is in a corresponding working state.

[0010] In a possible implementation, the reflected power determination unit includes a first acquisition module, a second acquisition module, a first operation module, and a second operation module. The first acquisition module is connected between the output end of the RF power amplifier and one of the input ends of the first operation module, the second acquisition module is connected between the output end of the RF power amplifier and another input end of the first operation module, the output end of the first operation module is connected to one of the input ends of the second operation module, the other input end of the second operation module is used to input the characteristic impedance value, and the output end of the second operation module is connected to the comparison unit. Among them, the first acquisition module is used to obtain the reflection coefficient modulus value, the second acquisition module is used to obtain the output voltage value, the first operation module is used to determine the reflected wave voltage value according to the reflection coefficient modulus value and the output voltage value, and the second operation module is used to determine the reflected power value according to the reflected wave voltage value and the characteristic impedance value.

[0011] In one possible implementation, the first operation module is used to perform a multiplication operation on the reflection coefficient modulus and the output voltage value to obtain a first operation value, and to perform an addition operation on the reflection coefficient modulus and a preset constant to obtain a second operation value, and to perform a division operation on the first operation value and the second operation value to obtain the reflected wave voltage value.

[0012] In a possible implementation manner, the second operation module is used to perform a square operation on the reflected wave voltage value to obtain a third operation value, and perform a division operation on the third operation value and the characteristic impedance value to obtain the reflected power value.

[0013] In a second aspect, a radio frequency power supply device is also provided, the radio frequency power supply device comprising a radio frequency power amplifier and a radio frequency power amplifier protection device. The radio frequency power amplifier protection device comprises a reflected power determination unit, a comparison unit and a control unit. The reflected power determination unit is used to be connected to the output end of the radio frequency power amplifier to obtain the reflection coefficient modulus and output voltage value at the output end of the radio frequency power amplifier when the radio frequency power amplifier outputs the radio frequency signal to the load, and at least determine the reflected power value when the radio frequency power amplifier transmits the radio frequency signal to the load according to the reflection coefficient modulus and the output voltage value. The comparison unit is connected to the reflected power determination unit, the comparison unit is used to receive the reflected power value, and at least compare the reflected power value with a first preset value to obtain a first comparison result signal. The control unit is connected to the comparison unit, the control unit is used to receive the first comparison result signal, and at least control the radio frequency power amplifier to be in a corresponding working state according to the first comparison result signal; wherein the working state of the radio frequency power amplifier includes at least a first power output state and a stop output state.

[0014] The RF power amplifier protection device and RF power supply equipment of the present application determine the reflected power value according to the reflection coefficient modulus and the output voltage value at the output end of the RF power amplifier by setting a reflected power determination unit, and compare the reflected power value with a first preset value by setting a comparison unit, so as to control the RF power amplifier to be in a first power output state or stop the output state according to the first comparison result signal obtained, and adjust the working state of the RF power amplifier, so as to protect the RF power amplifier and prevent the RF power amplifier from being defeated by the reflected power. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0016] Figure 1 Schematic diagram of a radio frequency power amplifier protection device in an embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of a radio frequency power amplifier protection device in another embodiment of the present application.

[0018] Figure 3 This is a schematic diagram of a radio frequency power amplifier protection device in another embodiment of the present application.

[0019] Figure 4 This is a schematic diagram of a radio frequency power amplifier protection device in yet another embodiment of the present application.

[0020] Figure 5It is a schematic diagram of a radio frequency power supply device in one embodiment of the present application.

[0021] Explanation of the accompanying drawings: 1000, RF power supply equipment, PA, RF power amplifier, RFS, RF signal, DC, DC voltage, CO, crystal oscillator signal, 10, RF power amplifier protection device, 100, reflected power determination unit, 110, first acquisition module, |Γ|, reflection coefficient modulus, 120, second acquisition module, Uo, output voltage value, 130, first operation module, i1, first input terminal, i2, second input terminal, o1, first output terminal, U-, reflected wave voltage value, 140, second operation module, i3, third input terminal, i4, fourth input terminal, o2, second output terminal, Z0, characteristic impedance value, Pr, reflected power value, 200, comparison unit, 210, first comparison module, Cv1, first preset value, OP1, first comparison result signal, 220, second comparison module, Cv2, second preset value, OP2, second comparison result signal, 300, control unit, RL, load. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0025] In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device.

[0026] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a radio frequency power amplifier protection device in an embodiment of the present application. Figure 1 As shown, the present application provides a radio frequency power amplifier protection device 10, and the radio frequency power amplifier protection device 10 includes a reflected power determination unit 100, a comparison unit 200, and a control unit 300. The reflected power determination unit 100 is used to be connected to the output end of the radio frequency power amplifier PA to obtain the reflection coefficient modulus |Γ| and the output voltage value Uo at the output end of the radio frequency power amplifier PA when the radio frequency power amplifier PA outputs the radio frequency signal RFS to the load RL, and at least determine the reflected power value Pr when the radio frequency power amplifier PA transmits the radio frequency signal RFS to the load RL according to the reflection coefficient modulus |Γ| and the output voltage value Uo. The comparison unit 200 is connected to the reflected power determination unit 100, and the comparison unit 200 is used to receive the reflected power value Pr, and at least compare the reflected power value Pr with the first preset value Cv1 to obtain the first comparison result signal OP1. The control unit 300 is connected to the comparison unit 200, and the control unit 300 is used to receive the first comparison result signal OP1, and control the RF power amplifier PA to be in a corresponding working state at least according to the first comparison result signal OP1; wherein the working state of the RF power amplifier PA at least includes a first power output state and a stop output state.

[0027] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application determines the reflected power value Pr according to the reflection coefficient modulus |Γ| and the output voltage value Uo at the output end of the RF power amplifier PA by setting the reflected power determination unit 100, and compares the reflected power value Pr with the first preset value Cv1 by setting the comparison unit 200, so as to control the RF power amplifier PA to be in the first power output state or stop the output state according to the first comparison result signal OP1 obtained, and adjust the working state of the RF power amplifier PA, so as to protect the RF power amplifier PA and prevent the RF power amplifier PA from being defeated by the reflected power.

[0028] In one or more embodiments, the comparison unit 200 is used to obtain a first comparison result signal OP1 that is continuously at a high level when the reflected power value Pr is greater than the first preset value Cv1, and to obtain a first comparison result signal OP1 that is continuously at a low level when the reflected power value Pr is less than the first preset value Cv1. The control unit 300 is used to control the RF power amplifier PA to be in a stop output state when the first comparison result signal OP1 is at a high level, and to control the RF power amplifier PA to be in a first power output state when the first comparison result signal OP1 is at a low level.

[0029] Thus, in the above-mentioned RF power amplifier protection device 10 in the present application, when the reflected power value Pr is greater than the first preset value Cv1, it indicates that the reflected power value Pr is too large, and the comparison unit 200 obtains the first comparison result signal OP1 which is continuously at a high level; when the reflected power value Pr is less than the first preset value Cv1, it indicates that the reflected power value Pr is small, and the comparison unit 200 obtains the first comparison result signal OP1 which is continuously at a low level. Thus, the influence of the reflected power value Pr on the RF power amplifier PA can be reflected according to the level of the first comparison result signal OP1, and then the control unit 300 can control the RF power amplifier PA to be in the first power output state or stop output state according to the level of the first comparison result signal OP1.

[0030] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a radio frequency power amplifier protection device in another embodiment of the present application. Figure 2 As shown, the working state of the RF power amplifier PA also includes a second power output state, and the power value of the RF signal RFS output by the RF power amplifier PA when it is in the second power output state is greater than the power value of the RF signal RFS output when it is in the first power output state. The comparison unit 200 is also used to compare the reflected power value Pr with the second preset value Cv2 to obtain a second comparison result signal OP2, wherein the second preset value Cv2 is less than the first preset value Cv1. The control unit 300 is also used to receive the second comparison result signal OP2, and control the RF power amplifier PA to be in a corresponding working state according to the first comparison result signal OP1 and the second comparison result signal OP2.

[0031] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application can configure the comparison unit 200 to further compare the reflected power value Pr with the second preset value Cv2 by setting the second power output state in which the RF power amplifier PA outputs a larger power value to obtain the second comparison result signal OP2, and cooperate to control the RF power amplifier PA to be in a corresponding working state according to the first comparison result signal OP1 and the second comparison result signal OP2, so as to protect the RF power amplifier PA more accurately.

[0032] It should be noted that the greater the power value of the RF signal RFS output by the RF power amplifier PA in the working state, the easier it is for the RF power amplifier PA to be damaged due to the reflected power. Therefore, when the reflected power value Pr is too large, reducing the power value of the RF signal RFS output by the RF power amplifier PA in the working state, or directly stopping the operation of the RF power amplifier PA, can effectively protect the RF power amplifier PA.

[0033] In one or more embodiments, the control unit 300 controls the RF power amplifier PA to be in a corresponding working state according to the first comparison result signal OP1 and the second comparison result signal OP2, which may include: when the first comparison result signal OP1 is at a low level, the control unit 300 controls the RF power amplifier PA to be in a corresponding working state according to the second comparison result signal OP2.

[0034] In one or more embodiments, when the reflected power value Pr is greater than the second preset value Cv2, the second comparison result signal OP2 obtained by the comparison unit 200 continues to be at a high level, and when the reflected power value Pr is less than the second preset value Cv2, the second comparison result signal OP2 obtained by the comparison unit 200 continues to be at a low level. The control unit 300 is used to control the RF power amplifier PA to be in a first power output state when the first comparison result signal OP1 is at a low level and the second comparison result signal OP2 is at a high level, and to control the RF power amplifier PA to be in a second power output state when the first comparison result signal OP1 is at a low level and the second comparison result signal OP2 is at a low level. That is, when the first comparison result signal OP1 is maintained at a low level, the power output state of the RF power amplifier PA is mainly different according to the second comparison result signal OP2, that is, when the first comparison result signal OP1 is at a low level, the control unit 300 controls the RF power amplifier PA to be in a corresponding working state according to the second comparison result signal OP2.

[0035] Thus, in the above-mentioned RF power amplifier protection device 10 in the present application, when the reflected power value Pr is greater than the second preset value Cv2, it indicates that the reflected power value Pr is too large, and the comparison unit 200 obtains the second comparison result signal OP2 which is continuously at a high level; when the reflected power value Pr is less than the second preset value Cv2, it indicates that the reflected power value Pr is too small, and the comparison unit 200 obtains the second comparison result signal OP2 which is continuously at a low level. Thus, the influence of the reflected power value Pr on the RF power amplifier PA can be further reflected according to the level of the second comparison result signal OP2, and then the control unit 300 can control the RF power amplifier PA to be in the first power output state or the second power output state according to the level of the second comparison result signal OP2.

[0036] like Figure 2 As shown, the comparison unit 200 includes a first comparison module 210 and a second comparison module 220. The first input terminal i1 of the first comparison module 210 is connected to the reflected power determination unit 100 to receive the reflected power value Pr, the second input terminal i2 of the first comparison module 210 is used to receive the first preset value Cv1, and the first output terminal o1 of the first comparison module 210 is connected to the control unit 300 to output the first comparison result signal OP1 obtained by comparing the reflected power value Pr with the first preset value Cv1. The third input terminal i3 of the second comparison module 220 is connected to the reflected power determination unit 100 to receive the reflected power value Pr, the fourth input terminal i4 of the second comparison module 220 is used to receive the second preset value Cv2, and the second output terminal o2 of the second comparison module 220 is connected to the control unit 300 to output the second comparison result signal OP2 obtained by comparing the reflected power value Pr with the second preset value Cv2.

[0037] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application can obtain the required first comparison result signal OP1 and second comparison result signal OP2 by setting the first comparison module 210 and the second comparison module 220 to compare the reflected power value Pr with the first preset value Cv1 and the second preset value Cv2 respectively.

[0038] In one or more embodiments, the control unit 300 may also be connected to the second input terminal i2 of the first comparison module 210 and the fourth input terminal i4 of the second comparison module 220 to output the first preset value Cv1 and the second preset value Cv2 to the second input terminal i2 of the first comparison module 210 and the fourth input terminal i4 of the second comparison module 220, respectively.

[0039] In one or more embodiments, the first comparison module 210 and the second comparison module 220 may both be operational amplifiers, the first input terminal i1 of the first comparison module 210 and the third input terminal i3 of the second comparison module 220 may both be in-phase input terminals of the operational amplifier, the second input terminal i2 of the first comparison module 210 and the fourth input terminal i4 of the second comparison module 220 may both be inverting input terminals of the operational amplifier, and the first output terminal o1 of the first comparison module 210 and the second output terminal o2 of the second comparison module 220 may both be output terminals of the operational amplifier.

[0040] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a radio frequency power amplifier protection device in another embodiment of the present application. Figure 3As shown, the two input terminals of the RF power amplifier PA are used to input the DC voltage DC and the crystal oscillator signal CO respectively, and the crystal oscillator signal CO is power-amplified according to the voltage value of the DC voltage DC to obtain the RF signal RFS with a target power value, wherein the target power value is related to the voltage value of the DC voltage DC. The control unit 300 is used to control and adjust the voltage value of the DC voltage DC according to at least the first comparison result signal OP1, so that the target power value of the RF signal RFS obtained after power amplification changes according to the change of the voltage value of the DC voltage DC, so that the RF power amplifier PA is in a corresponding working state.

[0041] Thus, in the above-mentioned RF power amplifier protection device 10 in the present application, the RF power amplifier PA performs power amplification on the crystal oscillator signal CO according to the voltage value of the DC voltage DC to obtain the RF signal RFS having a target power value, and the target power value is related to the voltage value of the DC voltage DC. Therefore, by configuring the control unit 300 to control and adjust the voltage value of the DC voltage DC at least according to the first comparison result signal OP1, the target power value of the RF signal RFS obtained after power amplification changes according to the change of the voltage value of the DC voltage DC, so that the RF power amplifier PA is in a corresponding working state.

[0042] In one or more embodiments, the DC power supply unit that outputs the DC voltage DC to the RF power amplifier PA may be a switching power supply, and the control unit 300 may control the voltage value of the DC voltage DC by controlling and adjusting the on-duty cycle of the switch in the DC power supply unit.

[0043] In one or more embodiments, a crystal oscillator signal CO may be output to the radio frequency power amplifier PA via a quartz crystal oscillator unit.

[0044] See also Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a radio frequency power amplifier protection device in another embodiment of the present application. Figure 4As shown, the reflected power determination unit 100 includes a first acquisition module 110, a second acquisition module 120, a first operation module 130 and a second operation module 140. The first acquisition module 110 is connected between the output end of the RF power amplifier PA and one of the input ends of the first operation module 130, the second acquisition module 120 is connected between the output end of the RF power amplifier PA and another input end of the first operation module 130, the output end of the first operation module 130 is connected to one of the input ends of the second operation module 140, the other input end of the second operation module 140 is used to input the characteristic impedance value Z0, and the output end of the second operation module 140 is connected to the comparison unit 200. Among them, the first acquisition module 110 is used to obtain the reflection coefficient modulus value |Γ|, the second acquisition module 120 is used to obtain the output voltage value Uo, the first operation module 130 is used to determine the reflected wave voltage value U- according to the reflection coefficient modulus value |Γ| and the output voltage value Uo, and the second operation module 140 is used to determine the reflected power value Pr according to the reflected wave voltage value U- and the characteristic impedance value Z0.

[0045] Thus, the above-mentioned RF power amplifier protection device 10 in the present application obtains the reflection coefficient modulus |Γ| and the output voltage value Uo respectively by setting the first acquisition module 110 and the second acquisition module 120, and receives the reflected wave voltage value U- and the characteristic impedance value Z0 by setting the first operation module 130 and the second operation module 140, and determines the reflected power value Pr, so as to achieve the acquisition of the reflected power value Pr.

[0046] In one or more embodiments, the first acquisition module 110 and the second acquisition module 120 may include one or more integrated devices such as voltage sensors, current sensors, and various processors, and the first operation module 130 and the second operation module 140 may include one or more integrated devices such as adders, subtractors, multipliers, and dividers.

[0047] In one or more embodiments, the first operation module 130 is used to multiply the reflection coefficient modulus |Γ| and the output voltage value Uo to obtain a first operation value, and to add the reflection coefficient modulus |Γ| and a preset constant to obtain a second operation value, and to divide the first operation value and the second operation value to obtain a reflected wave voltage value U-.

[0048] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application can obtain the reflected wave voltage value U- by performing a series of multiplication, addition and division operations on the reflection coefficient modulus value |Γ| and the output voltage value Uo.

[0049] The preset constant may be 1.

[0050] In one or more embodiments, the second operation module 140 is used to perform a square operation on the reflected wave voltage value U- to obtain a third operation value, and perform a division operation on the third operation value and the characteristic impedance value Z0 to obtain a reflected power value Pr.

[0051] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application can obtain the reflected power value Pr by performing a series of square and division operations on the reflected wave voltage value U- and the characteristic impedance value Z0.

[0052] The characteristic impedance value Z0 is a preset impedance value of the RF power amplifier PA, the load RL and the transmission path when the RF power amplifier PA outputs the RF signal RFS to the load RL, which is generally 50Ω, 75Ω, etc.

[0053] In one or more embodiments, the output voltage value Uo is an effective value.

[0054] In one or more embodiments, the control unit 300 can be a general-purpose processor such as a central processing unit (CPU), or a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate logic devices, transistor logic devices and other logic control devices, or a microprocessor such as a micro control unit (MCU).

[0055] In one or more embodiments, Figure 1-Figure 4 The oPA shown is the output end of the radio frequency power amplifier PA, and the reflected power determination unit 100 can be directly connected to the output end of the radio frequency power amplifier PA. Figure 1-Figure 4 The oPA shown is connected to obtain the reflection coefficient modulus |Γ| and output voltage value Uo at the output end of the RF power amplifier PA when the RF power amplifier PA outputs the RF signal RFS to the load RL, thereby avoiding the influence that may be caused by the line impedance.

[0056] The RF power amplifier protection device 10 of the present application, through the above-mentioned structure, can accurately and effectively protect the RF power amplifier PA by adjusting the working state of the RF power amplifier PA, thereby preventing the RF power amplifier PA from being destroyed by reflected power, thereby maintaining the output stability of the RF power amplifier PA.

[0057] See also Figure 5 , Figure 5FIG. 1 is a schematic diagram of a radio frequency power supply device in an embodiment of the present application. Figure 5 As shown, the present application further provides a radio frequency power supply device 1000, and the radio frequency power supply device 1000 includes a radio frequency power amplifier PA and a radio frequency power amplifier protection device 10 in any of the aforementioned embodiments.

[0058] Please refer again Figure 1 .like Figure 1 As shown, the RF power amplifier protection device 10 includes a reflected power determination unit 100, a comparison unit 200, and a control unit 300. The reflected power determination unit 100 is used to be connected to the output end of the RF power amplifier PA to obtain the reflection coefficient modulus |Γ| and the output voltage value Uo at the output end of the RF power amplifier PA when the RF power amplifier PA outputs the RF signal RFS to the load RL, and at least determine the reflected power value Pr when the RF power amplifier PA transmits the RF signal RFS to the load RL according to the reflection coefficient modulus |Γ| and the output voltage value Uo. The comparison unit 200 is connected to the reflected power determination unit 100, and the comparison unit 200 is used to receive the reflected power value Pr, and at least compare the reflected power value Pr with the first preset value Cv1 to obtain a first comparison result signal OP1. The control unit 300 is connected to the comparison unit 200, and the control unit 300 is used to receive the first comparison result signal OP1, and at least control the RF power amplifier PA to be in a corresponding working state according to the first comparison result signal OP1; wherein the working state of the RF power amplifier PA includes at least a first power output state and a stop output state.

[0059] Among them, the more specific structure of the RF power amplifier protection device 10 can refer to the relevant content of the RF power amplifier protection device 10 in any of the aforementioned embodiments, which will not be repeated here.

[0060] like Figure 1 , Figure 5 As shown, the radio frequency power amplifier PA can be used to output a radio frequency signal RFS to a load RL to provide electrical energy to the load RL.

[0061] The RF power amplifier protection device 10 and RF power supply equipment 1000 of the present application can accurately and effectively protect the RF power amplifier PA by adjusting the working state of the RF power amplifier PA, thereby preventing the RF power amplifier PA from being overwhelmed by reflected power, thereby maintaining the output stability of the RF power amplifier PA.

[0062] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A radio frequency power amplifier protection device, characterized in that: include: a reflected power determination unit, configured to be connected to an output end of a radio frequency power amplifier to obtain a reflection coefficient modulus and an output voltage value at the output end of the radio frequency power amplifier when the radio frequency power amplifier outputs a radio frequency signal to a load, and to determine a reflected power value when the radio frequency power amplifier transmits a radio frequency signal to the load at least based on the reflection coefficient modulus and the output voltage value; a comparing unit connected to the reflected power determining unit, the comparing unit being configured to receive the reflected power value and at least compare the reflected power value with a first preset value to obtain a first comparison result signal; A control unit is connected to the comparison unit, and is used to receive the first comparison result signal and control the RF power amplifier to be in a corresponding working state at least according to the first comparison result signal; wherein the working state of the RF power amplifier includes at least a first power output state and a stop output state.

2. The radio frequency power amplifier protection device according to claim 1, characterized in that: The comparison unit is used to obtain the first comparison result signal which is continuously at a high level when the reflected power value is greater than the first preset value, and to obtain the first comparison result signal which is continuously at a low level when the reflected power value is less than the first preset value; The control unit is used to control the RF power amplifier to be in a stop output state when the first comparison result signal is at a high level, and to control the RF power amplifier to be in the first power output state when the first comparison result signal is at a low level.

3. The radio frequency power amplifier protection device according to claim 1, characterized in that: The working state of the RF power amplifier also includes a second power output state, and the power value of the RF signal output by the RF power amplifier when it is in the second power output state is greater than the power value of the RF signal output when it is in the first power output state; The comparison unit is further used to compare the reflected power value with a second preset value to obtain a second comparison result signal, wherein the second preset value is smaller than the first preset value; The control unit is further configured to receive the second comparison result signal, and control the RF power amplifier to be in a corresponding working state according to the first comparison result signal and the second comparison result signal.

4. The radio frequency power amplifier protection device according to claim 3, characterized in that: When the reflected power value is greater than the second preset value, the second comparison result signal obtained by the comparison unit is continuously at a high level, and when the reflected power value is less than the second preset value, the second comparison result signal obtained by the comparison unit is continuously at a low level; The control unit is used to control the RF power amplifier to be in the first power output state when the first comparison result signal is at a low level and the second comparison result signal is at a high level, and to control the RF power amplifier to be in the second power output state when the first comparison result signal is at a low level and the second comparison result signal is at a low level.

5. The radio frequency power amplifier protection device according to claim 3, characterized in that: The comparison unit includes a first comparison module and a second comparison module; The first input end of the first comparison module is connected to the reflected power determination unit to receive the reflected power value, the second input end of the first comparison module is used to receive the first preset value, and the first output end of the first comparison module is connected to the control unit to output the first comparison result signal obtained by comparing the reflected power value with the first preset value; The third input end of the second comparison module is connected to the reflected power determination unit to receive the reflected power value, the fourth input end of the second comparison module is used to receive the second preset value, and the second output end of the second comparison module is connected to the control unit to output the second comparison result signal obtained by comparing the reflected power value with the second preset value.

6. The radio frequency power amplifier protection device according to claim 1, characterized in that: The two input terminals of the RF power amplifier are used to input a DC voltage and a crystal oscillator signal respectively, and the crystal oscillator signal is power-amplified according to the voltage value of the DC voltage to obtain a RF signal with a target power value, wherein the target power value is related to the voltage value of the DC voltage; The control unit is used to control and adjust the voltage value of the DC voltage at least according to the first comparison result signal, so that the target power value of the RF signal obtained after power amplification changes according to the change of the voltage value of the DC voltage, thereby making the RF power amplifier in a corresponding working state.

7. The radio frequency power amplifier protection device according to claim 1, characterized in that: The reflected power determination unit includes a first acquisition module, a second acquisition module, a first calculation module and a second calculation module; The first acquisition module is connected between the output end of the RF power amplifier and one of the input ends of the first operation module, the second acquisition module is connected between the output end of the RF power amplifier and another input end of the first operation module, the output end of the first operation module is connected to one of the input ends of the second operation module, the other input end of the second operation module is used to input the characteristic impedance value, and the output end of the second operation module is connected to the comparison unit; Among them, the first acquisition module is used to obtain the reflection coefficient modulus value, the second acquisition module is used to obtain the output voltage value, the first operation module is used to determine the reflected wave voltage value according to the reflection coefficient modulus value and the output voltage value, and the second operation module is used to determine the reflected power value according to the reflected wave voltage value and the characteristic impedance value.

8. The radio frequency power amplifier protection device according to claim 7, characterized in that: The first operation module is used to multiply the reflection coefficient modulus and the output voltage value to obtain a first operation value, add the reflection coefficient modulus and a preset constant to obtain a second operation value, and divide the first operation value and the second operation value to obtain the reflected wave voltage value.

9. The radio frequency power amplifier protection device according to claim 7, characterized in that: The second operation module is used for performing a square operation on the reflected wave voltage value to obtain a third operation value, and performing a division operation on the third operation value and the characteristic impedance value to obtain the reflected power value.

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

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