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

Abstract

The application provides a radio frequency power amplifier protection device and a radio frequency power supply equipment. The radio frequency power amplifier protection device comprises a first processing module, a second processing module, a third processing module and a control module. The first processing module is used for obtaining an input voltage signal and an input current signal at a first input end of a radio frequency power amplifier, and obtaining an input power value according to the input voltage signal and the input current signal. The second processing module is used for obtaining an output voltage signal and an output current signal at an output end of the radio frequency power amplifier, and obtaining an output power value according to the output voltage signal and the output current signal. The third processing module is used for obtaining a loss power value according to the input power value and the output power value. The control module is used for controlling the radio frequency power amplifier to be in a first power output state or a stop output state according to a size relationship between the loss power value and a first preset value. The application can protect the radio frequency power amplifier.

Description

Technical Field

[0001] This 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 Technology

[0002] Currently, with the development of radio frequency (RF) technology, RF power amplifiers are often used to amplify crystal oscillator signals and transmit the amplified RF signals to loads to provide power to various loads. However, RF power amplifiers have relatively stringent requirements for their operating environment and are easily damaged by reflected power when the operating environment changes. Therefore, how to protect RF power amplifiers and prevent them from being damaged by reflected power has become a problem that needs to be considered. Summary of the Invention

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

[0004] In a first aspect, a radio frequency (RF) power amplifier protection device is provided. This device switches the operating state of the RF power amplifier. A first input terminal of the RF power amplifier is used to input a DC voltage, and a second input terminal is used to input a crystal oscillator signal. The RF power amplifier amplifies the crystal oscillator signal based on the DC voltage value to obtain an RF signal with a target power value, and outputs it to a load through an output terminal. The RF power amplifier protection device includes a first processing module, a second processing module, a third processing module, and a control module. The first processing module is connected to the first input terminal of the RF power amplifier to obtain the input voltage signal and input current signal at the first input terminal, and obtains the input power value based on the input voltage signal and input current signal. The second processing module is connected to the output terminal of the RF power amplifier to obtain the output voltage signal and output current signal at the output terminal, and obtains the output power value based on the output voltage signal and output current signal. The third processing module is connected to both the first and second processing modules, and obtains the power loss value based on the input power value and the output power value. The control module is connected to the third processing module. The control module is used to control the radio frequency power amplifier to be in a corresponding working state based at least on the relationship between the power loss value and the first preset value. The working state of the radio frequency power amplifier includes at least a first power output state and a stop output state.

[0005] In one possible implementation, the first processing module includes a first detector, a second detector, a first power factor calculator, and a first arithmetic unit. The first detector is connected to a first input terminal of the RF power amplifier to obtain the input voltage signal. The second detector is connected to a first input terminal of the RF power amplifier to obtain the input current signal. The two input terminals of the first power factor calculator are respectively connected to the first detector and the second detector. The first power factor calculator is used to calculate a first power factor based on the input voltage signal and the input current signal received from the two input terminals, and outputs the first power factor through its output terminal. The three input terminals of the first arithmetic unit are respectively connected to the first detector, the second detector, and the output terminal of the first power factor calculator. The output terminal of the first arithmetic unit is connected to the third processing module. The first arithmetic unit is used to calculate the input power value based on the input voltage signal, the input current signal, and the first power factor received from the three input terminals, and outputs the input power value through its output terminal.

[0006] In one possible implementation, the second processing module includes a third detector and a fourth detector; the third detector is used to connect to the output terminal of the radio frequency power amplifier to obtain the output voltage signal; the fourth detector is used to connect to the output terminal of the radio frequency power amplifier to obtain the output current signal.

[0007] In one possible implementation, the second processing module further includes a second power factor calculator and a second arithmetic unit; the two input terminals of the second power factor calculator are respectively connected to the third detector and the fourth detector, and the second power factor calculator is used to calculate a second power factor based on the output voltage signal and the output current signal received by the two input terminals respectively, and output the second power factor through the output terminal; the three input terminals of the second arithmetic unit are respectively connected to the third detector, the fourth detector and the output terminal of the second power factor calculator, and the output terminal of the second arithmetic unit is connected to the third processing module, and the second arithmetic unit is used to calculate the output power value based on the output voltage signal, the output current signal and the second power factor received by the three input terminals respectively, and output the output power value through the output terminal.

[0008] In one possible implementation, the second processing module further includes a third arithmetic unit, a fourth arithmetic unit, and a fifth arithmetic unit; two input terminals of the third arithmetic unit are respectively connected to the third detector and the fourth detector, and the third arithmetic unit is used to calculate the load impedance value based on the output voltage signal and the output current signal received at the two input terminals respectively, and output the load impedance value through the output terminal; one input terminal of the fourth arithmetic unit is connected to the output terminal of the third arithmetic unit, and the other input terminal of the fourth arithmetic unit is used to receive the characteristic impedance value, and the fourth arithmetic unit is used to calculate the reflection coefficient magnitude based on the load impedance value and the preset impedance value received at the two input terminals respectively, and output the reflection coefficient magnitude value through the output terminal; two input terminals of the fifth arithmetic unit are respectively connected to the output terminals of the third detector and the fourth arithmetic unit, and the other input terminal of the fifth arithmetic unit is used to receive the characteristic impedance value, and the output terminal of the fifth arithmetic unit is connected to the third processing module, and the fifth arithmetic unit is used to calculate the output power value based on the output voltage signal received at the three input terminals, the reflection coefficient magnitude value, and the characteristic impedance value, and output the output power value through the output terminal.

[0009] In one possible implementation, the third arithmetic unit is used to perform a division operation on the output voltage signal and the output current signal to obtain the load impedance value; the fourth arithmetic unit is used to perform a division operation on the difference between the load impedance value and the preset impedance value and the sum of the load impedance value and the preset impedance value to obtain a first calculated value, and to perform a modulus operation on the first calculated value to obtain the reflection coefficient modulus value; the fifth arithmetic unit is used to perform a division operation on the square of the output voltage signal and the preset impedance value to obtain a second calculated value, and to perform a division operation on the difference between the square of the preset constant and the square of the reflection coefficient modulus value and the square of the sum of the preset constant and the reflection coefficient modulus value to obtain a third calculated value, and to perform a multiplication operation on the second calculated value and the third calculated value to obtain the output power value.

[0010] In one possible implementation, the third processing module includes a sixth arithmetic unit. The two input terminals of the sixth arithmetic unit are respectively connected to the first processing module and the second processing module, and the output terminal of the sixth arithmetic unit is connected to the control module. The sixth arithmetic unit is used to receive the input power value and the output power value, and to perform a subtraction operation between the input power value and the output power value to obtain the power loss value.

[0011] In one possible implementation, the operating state of the RF power amplifier further includes a second power output state. The control module is configured to control the RF power amplifier to be in the first power output state, the second power output state, and the stop output state respectively, based on the relationship between the power loss value and the first preset value and / or the relationship between the power loss value and the second preset value.

[0012] In one possible implementation, the second preset value is less than the first preset value, and the power value of the RF signal output by the RF power amplifier in the second power output state is greater than the power value of the RF signal output in the first power output state. The control module is configured to control the RF power amplifier to be in the second power output state when the power loss value is less than the second preset value; control the RF power amplifier to be in the first power output state when the power loss value is greater than the second preset value and less than the first preset value; and control the RF power amplifier to be in the stop output state when the power loss value is greater than the first preset value.

[0013] Secondly, an RF power supply device is also provided, comprising an RF power amplifier and an RF power amplifier protection device. The RF power amplifier protection device is used to switch the operating state of the RF power amplifier. The first input terminal of the RF power amplifier is used to input a DC voltage, and the second input terminal is used to input a crystal oscillator signal. The RF power amplifier amplifies the crystal oscillator signal according to the DC voltage value to obtain an RF signal with a target power value, and outputs it to a load through an output terminal. The RF power amplifier protection device includes a first processing module, a second processing module, a third processing module, and a control module. The first processing module is connected to the first input terminal of the RF power amplifier to obtain the input voltage signal and input current signal at the first input terminal of the RF power amplifier, and obtains the input power value based on the input voltage signal and input current signal. The second processing module is connected to the output terminal of the RF power amplifier to obtain the output voltage signal and output current signal at the output terminal of the RF power amplifier, and obtains the output power value based on the output voltage signal and output current signal. The third processing module is connected to both the first and second processing modules, and is used to obtain the power loss value based on the input power value and the output power value. The control module is connected to the third processing module, and is used to control the RF power amplifier to operate in a corresponding state based at least on the relationship between the power loss value and a first preset value; wherein the operating states of the RF power amplifier include 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 this application obtain the input power value of the RF power amplifier by setting a first processing module, obtain the output power value of the RF power amplifier by setting a second processing module, and obtain the loss power value based on the input power value and the output power value by setting a third processing module. Then, based on the relationship between the loss power and a first preset value, the device indicates whether the RF power amplifier is in a first power output state or a stop output state, thereby adjusting the working state of the RF power amplifier and protecting the RF power amplifier from being damaged by reflected power. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 This is a schematic diagram of a radio frequency power amplifier protection device in one embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the first processing module in one embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the second processing module in one embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the second processing module in another embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the third processing module in one embodiment of this application.

[0021] Figure 6 This is a schematic diagram of a radio frequency power supply device in one embodiment of this application.

[0022] Explanation of reference numerals in the attached diagram: 1000, RF power supply device; PA, RF power amplifier; RFS, RF signal; i1, first input terminal; DC, DC voltage; i2, second input terminal; CO, crystal oscillator signal; 10, RF power amplifier protection device; 100, first processing module; 110, first detector; Ui, input voltage signal; 120, second detector; Ii, input current signal; 130, first power factor calculator; cosα1, first power factor; 140, first calculator; Pin, input power value; 200, second processing module. 210. Third detector, Uo, output voltage signal; 220. Fourth detector, Io, output current signal; 230. Second power factor calculator, cosα2, second power factor; 240. Second calculator; 250. Third calculator, ZL, load impedance value; Z0, characteristic impedance value; 260. Fourth calculator, |Γ|, reflection coefficient modulus; 270. Fifth calculator, Pout, output power value; 300. Third processing module; 310. Sixth calculator, Pd, power loss value; 400. Control module, RL, load. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Hereinafter, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," "fourth," etc., may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or devices.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of a radio frequency power amplifier protection device according to an embodiment of this application. Figure 1 As shown, this application provides an RF power amplifier protection device 10. The RF power amplifier protection device 10 is used to switch the operating state of the RF power amplifier PA. The first input terminal i1 of the RF power amplifier PA is used to input a DC voltage DC, and the second input terminal i2 of the RF power amplifier PA is used to input a crystal oscillator signal CO. The RF power amplifier PA is used to amplify the crystal oscillator signal CO according to the voltage value of the DC voltage to obtain an RF signal RFS with a target power value, and output it to the load RL through the output terminal. The RF power amplifier protection device 10 includes a first processing module 100, a second processing module 200, a third processing module 300, and a control module 400. The first processing module 100 is used to connect to the first input terminal i1 of the RF power amplifier PA to obtain the input voltage signal Ui and the input current signal Ii at the first input terminal i1 of the RF power amplifier PA, and obtain the input power value Pin according to the input voltage signal Ui and the input current signal Ii. The second processing module 200 is connected to the output terminal of the RF power amplifier PA to obtain the output voltage signal Uo and the output current signal Io at the output terminal of the RF power amplifier PA, and obtains the output power value Pout based on the output voltage signal Uo and the output current signal Io. The third processing module 300 is connected to the first processing module 100 and the second processing module 200 respectively, and is used to obtain the loss power value Pd based on the input power value Pin and the output power value Pout. The control module 400 is connected to the third processing module 300, and is used to control the RF power amplifier PA to be in a corresponding working state based at least on the relationship between the loss power value Pd and a first preset value; wherein, the working state of the RF power amplifier PA includes at least a first power output state and a stop output state.

[0028] Therefore, the RF power amplifier protection device 10 described above in this application obtains the input power value Pin of the RF power amplifier PA by setting the first processing module 100, obtains the output power value Pout of the RF power amplifier PA by setting the second processing module 200, and obtains the loss power value Pd based on the input power value Pin and the output power value Pout by setting the third processing module 300. Then, it provides an indication based on the relationship between the loss power and the first preset value to control the RF power amplifier PA to be in a first power output state or a stop output state, adjust the working state of the RF power amplifier PA, and protect the RF power amplifier PA from being damaged by reflected power.

[0029] In one or more embodiments, the control module 400 controls the RF power amplifier PA to be in a stop output state when the power loss value Pd is greater than or equal to a first preset value, and controls the RF power amplifier PA to be in a first power output state when the power loss value Pd is less than the first preset value.

[0030] In one or more embodiments, the control module 400 can be used to control and adjust the voltage value of the DC voltage DC based at least on the relationship between the power loss value Pd and the first preset value, so that the target power value of the RF signal RFS obtained after power amplification changes according to the change in the voltage value of the DC voltage DC, thereby causing the RF power amplifier PA to be in the corresponding working state.

[0031] Furthermore, the DC power supply unit that outputs DC voltage to the RF power amplifier PA can be a switching power supply. The control module 400 can control and adjust the voltage value of DC by controlling and adjusting the duty cycle of the switch in the DC power supply unit.

[0032] In one or more embodiments, a crystal oscillator signal CO can be output to an RF power amplifier PA via a quartz crystal oscillator unit.

[0033] It should be noted that since the RF power amplifier PA does not contain power-consuming components, the larger the power loss value Pd of the RF power amplifier PA in operation, the more unstable the operation of the RF power amplifier PA is, and the more easily it will be damaged. Therefore, when the power loss value Pd is too large, reducing the power value of the RF signal RFS output by the RF power amplifier PA in operation, or directly stopping the operation of the RF power amplifier PA, can effectively protect the RF power amplifier PA.

[0034] In one or more embodiments, such as Figure 1 The oPA shown is the output terminal of the RF power amplifier PA. The first processing module 100 can be directly connected to... Figure 1The first input terminal i1 shown is connected to obtain the input voltage signal Ui and input current signal Ii at the first input terminal i1 of the RF power amplifier PA. The second processing module 200 can be directly connected to... Figure 1 The oPA connection shown is used to obtain the output voltage signal Uo and the output current signal Io at the output terminal of the RF power amplifier PA, thereby avoiding the possible effects of line impedance.

[0035] Please refer to the following: Figure 2 , Figure 2 This is a schematic diagram of the first processing module in one embodiment of this application. For example... Figure 1 , Figure 2 As shown, the first processing module 100 includes a first detector 110, a second detector 120, a first power factor cosα1 arithmetic unit 130, and a first arithmetic unit 140. The first detector 110 is connected to the first input terminal i1 of the RF power amplifier PA to obtain the input voltage signal Ui. The second detector 120 is connected to the first input terminal i1 of the RF power amplifier PA to obtain the input current signal Ii. The two input terminals of the first power factor cosα1 arithmetic unit 130 are respectively connected to the first detector 110 and the second detector 120. The first power factor cosα1 arithmetic unit 130 is used to calculate the input voltage signal Ui based on the input terminals. The first power factor cosα1 is obtained by calculating the input voltage signal Ui and the input current signal Ii received from the first power factor Ui and the first power factor cosα1 is output through the output terminal. The three input terminals of the first arithmetic unit 140 are respectively connected to the first detector 110, the second detector 120 and the output terminal of the first power factor cosα1 arithmetic unit 130. The output terminal of the first arithmetic unit 140 is connected to the third processing module 300. The first arithmetic unit 140 is used to calculate the input power value Pin according to the input voltage signal Ui, the input current signal Ii and the first power factor cosα1 received from the three input terminals respectively, and output the input power value Pin through the output terminal.

[0036] Therefore, the RF power amplifier protection device 10 described above in this application, by setting the first detector 110 and the second detector 120 to obtain the input voltage signal Ui and the input current signal Ii at the first input terminal i1 of the RF power amplifier PA respectively, and by setting the first power factor cosα1 arithmetic unit 130 to determine the first power factor cosα1 of the phase angle between the input voltage signal Ui and the input current signal Ii, can avoid AC component interference at the first input terminal i1 of the RF power amplifier PA, and then by setting the first arithmetic unit 140 to determine the input power value Pin, so as to obtain a more accurate input power value Pin of the RF power amplifier PA.

[0037] Wherein, the first power factor cosα1 can be the cosine of the phase angle between the input voltage signal Ui and the input current signal Ii.

[0038] The input power value Pin can be the product of the effective value of the input voltage signal Ui, the effective value of the input current signal Ii, and the first power factor cosα1.

[0039] In one or more embodiments, since the first input terminal i1 of the RF power amplifier PA is used to input DC voltage DC, the phase angle between the input voltage signal Ui and the input current signal Ii is extremely small or does not affect the calculation. In order to save costs, the first processing module 100 may not have a first power factor cosα1 arithmetic unit 130. That is, the first processing module 100 includes a first detector 110, a second detector 120 and a first arithmetic unit 140. The two input terminals of the first arithmetic unit 140 are respectively connected to the first detector 110 and the second detector 120, and the output terminal of the first arithmetic unit 140 is connected to the third processing module 300. The first arithmetic unit 140 is used to calculate the input power value Pin based on the input voltage signal Ui and the input current signal Ii received by the two input terminals respectively, and output the input power value Pin through the output terminal.

[0040] The input power value Pin can be the product of the effective value of the input voltage signal Ui and the effective value of the input current signal Ii.

[0041] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of the second processing module in one embodiment of this application. Figure 1 , Figure 3 As shown, the second processing module 200 includes a third detector 210 and a fourth detector 220; the third detector 210 is used to connect to the output terminal of the radio frequency power amplifier PA to obtain the output voltage signal Uo; the fourth detector 220 is used to connect to the output terminal of the radio frequency power amplifier PA to obtain the output current signal Io.

[0042] Therefore, the RF power amplifier protection device 10 described above in this application, by setting the third detector 210 and the fourth detector 220, can acquire the output voltage signal Uo and the output current signal Io at the second input terminal i2 of the RF power amplifier PA.

[0043] In one or more embodiments, the first detector 110 and the third detector 210 may include voltage sensors, and the second detector 120 and the fourth detector 220 may include current sensors.

[0044] like Figure 1 , Figure 3As shown, the second processing module 200 further includes a second power factor calculator 230 and a second calculator 240. The two input terminals of the second power factor calculator 230 are respectively connected to the third detector 210 and the fourth detector 220. The second power factor calculator 230 is used to calculate the second power factor cosα2 based on the output voltage signal Uo and the output current signal Io received from the two input terminals respectively, and outputs the second power factor cosα2 through the output terminal. The three input terminals of the second calculator 240 are respectively connected to the third detector 210, the fourth detector 220 and the output terminal of the second power factor calculator 230. The output terminal of the second calculator 240 is connected to the third processing module 300. The second calculator 240 is used to calculate the output power value Pout based on the output voltage signal Uo, the output current signal Io and the second power factor cosα2 received from the three input terminals respectively, and outputs the output power value Pout through the output terminal.

[0045] Therefore, the above-mentioned RF power amplifier protection device 10 in this application determines the second power factor cosα2 of the phase angle between the output voltage signal Uo and the output current signal Io by setting the second power factor arithmetic unit 230, and determines the output power value Pout by setting the second arithmetic unit 240, so as to obtain the output power value Pout of the RF power amplifier PA.

[0046] The second power factor cosα2 can be the cosine of the phase angle between the output voltage signal Uo and the output current signal Io.

[0047] The output power value Pout can be the product of the effective value of the output voltage signal Uo, the effective value of the output current signal Io, and the second power factor cosα2.

[0048] Please refer to the following: Figure 4 , Figure 4 This is a schematic diagram of the second processing module in another embodiment of this application. Figure 1 , Figure 4As shown, the second processing module 200 also includes a third arithmetic unit 250, a fourth arithmetic unit 260, and a fifth arithmetic unit 270. The two input terminals of the third arithmetic unit 250 are connected to the third detector 210 and the fourth detector 220, respectively. The third arithmetic unit 250 is used to calculate the load impedance value ZL based on the output voltage signal Uo and the output current signal Io received from the two input terminals, and outputs the load impedance value ZL through its output terminal. One input terminal of the fourth arithmetic unit 260 is connected to the output terminal of the third arithmetic unit 250, and the other input terminal of the fourth arithmetic unit 260 is used to receive the characteristic impedance value Z0. The fourth arithmetic unit 260 is used to calculate the load impedance value Z0 based on the output voltage signal Uo and the output current signal Io received from the two input terminals. The fifth arithmetic unit 270 calculates the reflection coefficient magnitude |Γ| based on the received load impedance value ZL and the preset impedance value, and outputs the reflection coefficient magnitude |Γ| through the output terminal. Two of the input terminals of the fifth arithmetic unit 270 are connected to the output terminals of the third detector 210 and the fourth arithmetic unit 260, respectively. The other input terminal of the fifth arithmetic unit 270 is used to receive the characteristic impedance value Z0. The output terminal of the fifth arithmetic unit 270 is connected to the third processing module 300. The fifth arithmetic unit 270 calculates the output power value Pout based on the output voltage signal Uo, the reflection coefficient magnitude |Γ|, and the characteristic impedance value Z0 received from the three input terminals, and outputs the output power value Pout through the output terminal.

[0049] Therefore, the RF power amplifier protection device 10 described above in this application, by setting the third arithmetic unit 250, the fourth arithmetic unit 260 and the fifth arithmetic unit 270 to perform a series of calculations based on the output voltage signal Uo and the output current signal Io, can not only determine the output power value Pout to obtain the output power value Pout of the RF power amplifier PA, but also determine the load impedance value ZL, so as to perform impedance matching between the RF power amplifier PA and the load RL, thereby protecting the RF power amplifier PA.

[0050] In one or more embodiments, the third arithmetic unit 250 is used to perform a division operation on the output voltage signal Uo and the output current signal Io to obtain the load impedance value ZL; the fourth arithmetic unit 260 is used to perform a division operation on the difference between the load impedance value ZL and the preset impedance value and the sum of the load impedance value ZL and the preset impedance value to obtain a first calculated value, and to perform a modulus operation on the first calculated value to obtain the reflection coefficient modulus value |Γ|; the fifth arithmetic unit 270 is used to perform a division operation on the square of the output voltage signal Uo and the preset impedance value to obtain a second calculated value, and to perform a division operation on the difference between the square of the preset constant and the reflection coefficient modulus value |Γ| and the square of the sum of the preset constant and the reflection coefficient modulus value |Γ| to obtain a third calculated value, and to perform a multiplication operation on the second calculated value and the third calculated value to obtain the output power value Pout.

[0051] Among them, the characteristic impedance value Z0 is the 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. It is generally 50Ω, 75Ω, etc.

[0052] The preset constant can be 1.

[0053] It should be noted that since both the output voltage signal Uo and the output current signal Io have a certain amplitude and possible initial angle, the load impedance value ZL obtained by dividing the output voltage signal Uo and the output current signal Io may be in complex form, with real and imaginary parts. The first calculated value obtained by dividing the difference between the load impedance value ZL and the preset impedance value by the sum of the load impedance value ZL and the preset impedance value may also be in complex form, with real and imaginary parts. Therefore, the modulus operation is performed on the first calculated value, which is the square root of the sum of the squares of the real and imaginary parts of the first calculated value.

[0054] Furthermore, based on the relationship between the output power value Pout and the incident wave voltage value, the reflected wave voltage value, and the characteristic impedance value Z0, and since the incident wave voltage value and the reflected wave voltage value are both related to the reflection coefficient magnitude |Γ| and the effective value of the output voltage signal Uo, the fifth arithmetic unit 270 performs a division operation on the square of the output voltage signal Uo and the preset impedance value to obtain the second calculated value. That is, the fifth arithmetic unit 270 performs a division operation on the square of the effective value of the output voltage signal Uo and the preset impedance value to obtain the second calculated value.

[0055] Please refer to the following: Figure 5 , Figure 5 This is a schematic diagram of the third processing module in one embodiment of this application. Figure 1 , Figure 5 As shown, the third processing module 300 includes a sixth arithmetic unit 310. The two input terminals of the sixth arithmetic unit 310 are respectively connected to the first processing module 100 and the second processing module 200. The output terminal of the sixth arithmetic unit 310 is connected to the control module 400. The sixth arithmetic unit 310 is used to receive the input power value Pin and the output power value Pout, and to perform a subtraction operation on the input power value Pin and the output power value Pout to obtain the power loss value Pd.

[0056] Therefore, the RF power amplifier protection device 10 described above in this application can determine the power loss value Pd of the RF power amplifier PA based on the difference between the input power value Pin and the output power value Pout.

[0057] In one or more embodiments, the aforementioned first operation module, second operation module, third operation module, fourth operation module, fifth operation module, and sixth operation module may each include one or more integrated devices such as adders, subtractors, multipliers, and dividers.

[0058] In one or more embodiments, the operating state of the RF power amplifier PA also includes a second power output state. The control module 400 is used to control the RF power amplifier PA to be in a first power output state, a second power output state, and a stop output state according to the relationship between the power loss value Pd and a first preset value and / or the relationship between the power loss value Pd and a second preset value.

[0059] Therefore, the RF power amplifier protection device 10 described above in this application, by setting a second power output state where the RF power amplifier PA outputs a larger power value, can configure the control module 400 to further compare the power loss value Pd with a second preset value, and coordinate with the control module 400 to control the RF power amplifier PA to be in the corresponding working state according to the relationship between the power loss value Pd and the first preset value and / or the relationship between the power loss value Pd and the second preset value, thereby enabling more precise protection of the RF power amplifier PA.

[0060] In one or more embodiments, the second preset value is less than the first preset value, 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. Specifically, the control module 400 is configured to control the RF power amplifier PA to be in the second power output state when the power loss value Pd is less than the second preset value; control the RF power amplifier PA to be in the first power output state when the power loss value Pd is greater than the second preset value and less than the first preset value; and control the RF power amplifier PA to be in a stopped output state when the power loss value Pd is greater than the first preset value.

[0061] Therefore, the RF power amplifier protection device 10 described in this application, when the power loss value Pd is less than the second preset value, indicates that the power loss value Pd is too small, and the RF power amplifier PA can be in a second power output state with a higher power value; when the power loss value Pd is greater than the second preset value and less than the first preset value, it indicates that the power loss value Pd is too large, and the RF power amplifier PA can be in a first power output state with a lower power value; when the power loss value Pd is greater than the first preset value, it indicates that the power loss value Pd is too large, and the RF power amplifier PA needs to be in a stopped output state. Thus, the relationship between the power loss value Pd and the first preset value, and the relationship between the power loss value Pd and the second preset value, further reflect the influence of the power loss value Pd on the RF power amplifier PA, and the control module 400 can control the operating state of the RF power amplifier PA to protect the RF power amplifier PA.

[0062] In one or more embodiments, both the first preset value and the second preset value can be critical values ​​of the power loss value Pd that causes the switching of the working state. The first preset value can be a critical value of the power loss value Pd that causes the switching between the first power output state and the stop output state, and the second preset value can be a critical value of the power loss value that causes the switching between the first power output state and the second power output state.

[0063] In one or more embodiments, the control module 400 may be a general-purpose processor such as a central processing unit (CPU), or a digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate logic devices, transistor logic devices, or other logic control devices. It may also be a microprocessor such as a micro control unit (MCU).

[0064] The RF power amplifier protection device 10 of this application, through the above structure, can accurately and effectively protect the RF power amplifier PA by adjusting the working state of the RF power amplifier PA, preventing the RF power amplifier PA from being damaged by reflected power, thereby maintaining the output stability of the RF power amplifier PA.

[0065] Please see Figure 6 , Figure 6 This is a schematic diagram of a radio frequency power supply device according to an embodiment of this application. Figure 6 As shown, this application also provides an RF power supply device 1000, which includes an RF power amplifier PA and an RF power amplifier protection device 10 in any of the foregoing embodiments.

[0066] Please refer to it again. Figure 1 .like Figure 1As shown, the RF power amplifier protection device 10 is used to switch the operating state of the RF power amplifier PA. The first input terminal i1 of the RF power amplifier PA is used to input a DC voltage DC, and the second input terminal i2 of the RF power amplifier PA is used to input a crystal oscillator signal CO. The RF power amplifier PA is used to amplify the crystal oscillator signal CO according to the voltage value of the DC voltage to obtain an RF signal RFS with a target power value, and output it to the load RL through the output terminal. The RF power amplifier protection device 10 includes a first processing module 100, a second processing module 200, a third processing module 300, and a control module 400. The first processing module 100 is connected to the first input terminal i1 of the RF power amplifier PA to obtain the input voltage signal Ui and the input current signal Ii at the first input terminal i1 of the RF power amplifier PA, and obtains the input power value Pin based on the input voltage signal Ui and the input current signal Ii. The second processing module 200 is connected to the output terminal of the RF power amplifier PA to obtain the output voltage signal Uo and the output current signal Io at the output terminal of the RF power amplifier PA, and obtains the output power value Pout based on the output voltage signal Uo and the output current signal Io. The third processing module 300 is connected to the first processing module 100 and the second processing module 200 respectively. The third processing module 300 is used to obtain the power loss value Pd based on the input power value Pin and the output power value Pout. The control module 400 is connected to the third processing module 300. The control module 400 is used to control the RF power amplifier PA to be in a corresponding working state based at least on the relationship between the power loss value Pd and a first preset value; wherein the working state of the RF power amplifier PA includes at least a first power output state and a stop output state.

[0067] For a more detailed description of the structure of the RF power amplifier protection device 10, please refer to the relevant content of the RF power amplifier protection device 10 in any of the foregoing embodiments, which will not be repeated here.

[0068] like Figure 1 , Figure 6 As shown, the radio frequency power amplifier PA can be used to output a radio frequency signal RFS to the load RL in order to provide power to the load RL.

[0069] The RF power amplifier protection device 10 and RF power supply device 1000 of this application can accurately and effectively protect the RF power amplifier PA by adjusting the working state of the RF power amplifier PA, preventing the RF power amplifier PA from being damaged by reflected power, thereby maintaining the output stability of the RF power amplifier PA.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A radio frequency power amplifier protection device, characterized by, The radio frequency power amplifier protection device is used for switching the working state of a radio frequency power amplifier, a first input end of the radio frequency power amplifier is used for inputting a direct current voltage, a second input end of the radio frequency power amplifier is used for inputting a crystal oscillator signal, the radio frequency power amplifier is used for power amplifying the crystal oscillator signal according to the voltage value of the direct current voltage to obtain a radio frequency signal with a target power value, and outputting the radio frequency signal to a load through an output end; The radio frequency power amplifier protection device comprises: A first processing module is connected with the first input end of the radio frequency power amplifier to obtain an input voltage signal and an input current signal at the first input end of the radio frequency power amplifier, and obtain an input power value according to the input voltage signal and the input current signal; A second processing module is connected with the output end of the radio frequency power amplifier to obtain an output voltage signal and an output current signal at the output end of the radio frequency power amplifier, and obtain an output power value according to the output voltage signal and the output current signal; A third processing module is connected with the first processing module and the second processing module respectively, and is used for obtaining a loss power value according to the input power value and the output power value; A control module is connected with the third processing module, and is used for controlling the radio frequency power amplifier to be in a corresponding working state according to at least the size relationship between the loss power value and a first preset value; wherein the working state of the radio frequency power amplifier at least includes a first power output state and a stop output state. The second processing module comprises a third detector and a fourth detector; the third detector is connected with the output end of the radio frequency power amplifier to obtain the output voltage signal; the fourth detector is connected with the output end of the radio frequency power amplifier to obtain the output current signal; the second processing module further comprises a third operator, a fourth operator and a fifth operator; two input ends of the third operator are connected with the third detector and the fourth detector respectively; the third operator is used for calculating a load impedance value according to the output voltage signal and the output current signal received by the two input ends respectively, and outputs the load impedance value through an output end; one input end of the fourth operator is connected with the output end of the third operator; another input end of the fourth operator is used for receiving a characteristic impedance value; the fourth operator is used for calculating a reflection coefficient module value according to the load impedance value and the preset impedance value received by the two input ends respectively, and outputs the reflection coefficient module value through an output end; two input ends of the fifth operator are connected with the third detector and the output end of the fourth operator respectively; another input end of the fifth operator is used for receiving the characteristic impedance value; the output end of the fifth operator is connected with the third processing module; the fifth operator is used for calculating the output power value according to the output voltage signal, the reflection coefficient module value and the characteristic impedance value received by the three input ends respectively, and outputs the output power value through an output end.

2. The RF power amplifier protection apparatus of claim 1, wherein, The first processing module comprises a first detector, a second detector, a first power factor operator and a first operator; the first detector is connected with the first input end of the radio frequency power amplifier to obtain the input voltage signal; The second detector is connected with the first input end of the radio frequency power amplifier to obtain the input current signal; Two input ends of the first power factor operator are connected with the first detector and the second detector respectively; the first power factor operator is used for calculating a first power factor according to the input voltage signal and the input current signal received by the two input ends respectively, and outputs the first power factor through an output end; three input ends of the first operator are connected with the first detector, the second detector and the output end of the first power factor operator respectively; the output end of the first operator is connected with the third processing module; the first operator is used for calculating the input power value according to the input voltage signal, the input current signal and the first power factor received by the three input ends respectively, and outputs the input power value through an output end.

3. The RF power amplifier protection device of claim 1, wherein, The third operator is configured to perform a division operation on the output voltage signal and the output current signal to obtain the load impedance value; the fourth operator is configured to perform a division operation on a difference between the load impedance value and the preset impedance value and a sum of the load impedance value and the preset impedance value to obtain a first operation value, and perform a modulus operation on the first operation value to obtain the reflection coefficient modulus value; the fifth operator is configured to perform a division operation on a square of the output voltage signal and the preset impedance value to obtain a second operation value, perform a division operation on a difference between a preset constant and a square of the reflection coefficient modulus value and a square of a sum of the preset constant and the reflection coefficient modulus value to obtain a third operation value, and perform a multiplication operation on the second operation value and the third operation value to obtain the output power value.

4. The RF power amplifier protection apparatus of claim 1, wherein, The third processing module comprises a sixth operator, two input ends of the sixth operator are connected with the first processing module and the second processing module respectively, and an output end of the sixth operator is connected with the control module. The sixth operator is configured to receive the input power value and the output power value, and perform a subtraction operation on the input power value and the output power value to obtain the loss power value.

5. The RF power amplifier protection device of claim 1, wherein, The working state of the radio frequency power amplifier further comprises a second power output state; The control module is configured to control the radio frequency power amplifier to be in the first power output state, the second power output state and the stop output state according to a relationship between the loss power value and the first preset value and / or a relationship between the loss power value and a second preset value.

6. The RF power amplifier protection apparatus of claim 5, wherein, The second preset value is smaller than the first preset value, and a power value of a radio frequency signal output by the radio frequency power amplifier in the second power output state is greater than a power value of a radio frequency signal output by the radio frequency power amplifier in the first power output state. The control module is configured to control the radio frequency power amplifier to be in the second power output state when the loss power value is smaller than the second preset value, control the radio frequency power amplifier to be in the first power output state when the loss power value is greater than the second preset value and smaller than the first preset value, and control the radio frequency power amplifier to be in the stop output state when the loss power value is greater than the first preset value.

7. A radio frequency power supply device, characterized by, The radio frequency power amplifier and the radio frequency power amplifier protection device according to any one of claims 1-6.

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