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 first processing module, a second processing module, a third processing module and a control module, the first processing module is used for acquiring an input voltage signal and an input current signal at a first input end of the 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 acquiring an output voltage signal and an output current signal at the 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 an output stopping state at least according to the size relation between the loss power value and a first preset value. 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 is used to switch the working state of the radio frequency power amplifier, the first input end of the radio frequency power amplifier is used to input a direct current voltage, the second input end of the radio frequency power amplifier is used to input a crystal oscillator signal, the radio frequency power amplifier is used to power amplify the crystal oscillator signal according to the voltage value of the direct current voltage, so as to obtain a radio frequency signal with a target power value, and output it to the load through the output end. Wherein, the radio frequency 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 used to connect 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. The second processing module is used to connect 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. The third processing module is connected to the first processing module and the second processing module respectively, and the third processing module is used to obtain a loss power value according to the input power value and the output power value. The control module is connected to the third processing module, and the control module is used to control the RF power amplifier to be in a corresponding working state at least according to the size relationship between the loss power value and the first preset value; wherein the working state of the RF power amplifier includes at least a first power output state and a stop output state.

[0005] In a possible implementation, the first processing module includes a first detector, a second detector, a first power factor operator and a first operator; the first detector is used to be connected to the first input end of the RF power amplifier to obtain the input voltage signal; the second detector is used to be connected to the first input end of the RF power amplifier to obtain the input current signal; the two input ends of the first power factor operator are respectively connected to the first detector and the second detector, the first power factor operator is used to calculate the first power factor according to the input voltage signal and the input current signal respectively received by the two input ends, and output the first power factor through the output end; the three input ends of the first operator are respectively connected to the first detector, the second detector and the output end of the first power factor operator, the output end of the first operator is connected to the third processing module, the first operator is used to calculate the input power value according to the input voltage signal, the input current signal and the first power factor respectively received by the three input ends, and output the input power value through the output end.

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

[0007] In a possible implementation, the second processing module also includes a second power factor operator and a second operator; the two input ends of the second power factor operator are respectively connected to the third detector and the fourth detector, and the second power factor operator is used to calculate the second power factor according to the output voltage signal and the output current signal respectively received by the two input ends, and output the second power factor through the output end; the three input ends of the second operator are respectively connected to the third detector, the fourth detector and the output end of the second power factor operator, the output end of the second operator is connected to the third processing module, and the second operator is used to calculate the output power value according to the output voltage signal, the output current signal and the second power factor respectively received by the three input ends, and output the output power value through the output end.

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

[0009] In one possible implementation, the third operator is used to divide the output voltage signal by the output current signal to obtain the load impedance value; the fourth operator is used to divide the difference between the load impedance value and the preset impedance value by the 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 modulus value of the reflection coefficient; the fifth operator is used to divide the square of the output voltage signal by the preset impedance value to obtain a second operation value, and divide the difference between a preset constant and the square of the reflection coefficient modulus value by the square of the sum of the preset constant and the reflection coefficient modulus value to obtain a third operation value, and multiply the second operation value by the third operation value to obtain the output power value.

[0010] In a possible embodiment, the third processing module includes a sixth operator, the two input ends of the sixth operator are respectively connected to the first processing module and the second processing module, the output end of the sixth operator is connected to the control module, and the sixth operator is used 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.

[0011] In a possible implementation, the working state of the RF power amplifier further includes a second power output state. The control module is used to control the RF power amplifier to be in the first power output state, the second power output state, and the stop output state according to 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 a 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 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 control module is used 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] 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 is used to switch the working state of the radio frequency power amplifier, the first input end of the radio frequency power amplifier is used to input a direct current voltage, the second input end of the radio frequency power amplifier is used to input a crystal oscillator signal, and the radio frequency power amplifier is used to amplify 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 output it to the load through the output end. Wherein, 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 to connect to 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. The second processing module is used to connect to 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. The third processing module is connected to the first processing module and the second processing module respectively, and the third processing module is used to obtain a power loss value according to the input power value and the output power value. The control module is connected to the third processing module, and the control module is used to control the RF power amplifier to be in a corresponding working state according to at least a magnitude relationship between the power loss value and a first preset value; wherein the working state of the RF 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 obtain the input power value of the RF power amplifier by setting the first processing module, obtain the output power value of the RF power amplifier by setting the second processing module, and obtain the loss power value according to the input power value and the output power value by setting the third processing module, and then indicate according to the relationship between the loss power and the first preset value to control the RF power amplifier to be in the first power output state or stop the output state, adjust the working state of the RF power amplifier, and protect the RF power amplifier to 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 Schematic diagram of a first processing module in an embodiment of the present application.

[0018] Figure 3 Schematic diagram of a second processing module in one embodiment of the present application.

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

[0020] Figure 5 It is a schematic diagram of a third processing module in an embodiment of the present application.

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

[0022] Description of reference numerals: 1000, RF power supply equipment, 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 operator, cosα1, first power factor, 140, first operator, Pin, input power value, 200, second processing module , 210, the third detector, Uo, the output voltage signal, 220, the fourth detector, Io, the output current signal, 230, the second power factor operator, cosα2, the second power factor, 240, the second operator, 250, the third operator, ZL, the load impedance value, Z0, the characteristic impedance value, 260, the fourth operator, |Γ|, the reflection coefficient modulus value, 270, the fifth operator, Pout, the output power value, 300, the third processing module, 310, the sixth operator, Pd, the loss power value, 400, the control module, RL, the load. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] In the following, the terms "first", "second", "third", "fourth", etc. 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", "second", "third", "fourth", etc. may explicitly or implicitly include one or more of the feature. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0026] 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.

[0027] 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, the radio frequency power amplifier protection device 10 is used to switch the working state of the radio frequency power amplifier PA, the first input terminal i1 of the radio frequency power amplifier PA is used to input the direct current voltage DC, the second input terminal i2 of the radio frequency power amplifier PA is used to input the crystal oscillator signal CO, and the radio frequency power amplifier PA is used to power amplify the crystal oscillator signal CO according to the voltage value of the direct current voltage DC to obtain a radio frequency signal RFS with a target power value, and output it to the load RL through the output terminal. Among them, the radio frequency 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 radio frequency power amplifier PA to obtain the input voltage signal Ui and the input current signal Ii at the first input terminal i1 of the radio frequency 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 used to connect with the output end of the RF power amplifier PA to obtain the output voltage signal Uo and the output current signal Io at the output end of the RF power amplifier PA, and obtain the output power value Pout according to 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 the third processing module 300 is used to obtain the loss power value Pd according to the input power value Pin and the output power value Pout. The control module 400 is connected to the third processing module 300, and the control module 400 is used to control the RF power amplifier PA to be in a corresponding working state at least according to the magnitude relationship between the loss power value Pd and the first preset value; wherein the working state of the RF power amplifier PA at least includes a first power output state and a stop output state.

[0028] Thus, the above-mentioned RF power amplifier protection device 10 in the present 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 according to the input power value Pin and the output power value Pout by setting the third processing module 300, and then indicates according to the relationship between the loss power and the first preset value to control the RF power amplifier PA to be in the first power output state or the output stop state, adjust the working state of the RF power amplifier PA, and can protect the RF power amplifier PA to prevent the RF power amplifier PA from being defeated by the 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 loss power value Pd is greater than or equal to the first preset value, and controls the RF power amplifier PA to be in a first power output state when the loss power 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 at least based on the relationship between the loss power 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 of the voltage value of the DC voltage DC, thereby making the RF power amplifier PA in a corresponding working state.

[0031] Furthermore, 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 module 400 may control and adjust 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.

[0032] 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.

[0033] It should be noted that since the RF power amplifier PA does not include energy-consuming devices, the larger the power loss value Pd of the RF power amplifier PA in the working state, the more unstable the working state of the RF power amplifier PA is, and it is easy to 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 the working state, 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, Figure 1 The oPA shown is the output end of the radio frequency power amplifier PA, and the first processing module 100 can be directly connected to the Figure 1The first input terminal i1 is connected 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. The second processing module 200 can be directly connected to the first input terminal i1 of the RF power amplifier PA. Figure 1 The oPA shown is connected to obtain the output voltage signal Uo and the output current signal Io at the output end of the RF power amplifier PA, thereby avoiding the influence that may be caused by the line impedance.

[0035] Please also read Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a first processing module in an embodiment of the present application. 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 operator 130 and a first operator 140; the first detector 110 is used to connect to the first input terminal i1 of the radio frequency power amplifier PA to obtain the input voltage signal Ui; the second detector 120 is used to connect to the first input terminal i1 of the radio frequency power amplifier PA to obtain the input current signal Ii; the two input terminals of the first power factor cosα1 operator 130 are respectively connected to the first detector 110 and the second detector 120, and the first power factor cosα1 operator 130 is used to respectively connect to the first input terminal i1 of the radio frequency power amplifier PA to obtain the input current signal Ii. The received input voltage signal Ui and the input current signal Ii are operated to obtain the first power factor cosα1, and the first power factor cosα1 is output through the output end; the three input ends of the first operator 140 are respectively connected to the first detector 110, the second detector 120 and the output end of the first power factor cosα1 operator 130, and the output end of the first operator 140 is connected to the third processing module 300. The first operator 140 is used to obtain the input power value Pin according to the input voltage signal Ui, the input current signal Ii and the first power factor cosα1 respectively received at the three input ends, and output the input power value Pin through the output end.

[0036] Thus, the above-mentioned RF power amplifier protection device 10 in the present application, by setting the first detector 110 and the second detector 120 to respectively 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 by setting the first power factor cosα1 operator 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 the existence of AC component interference at the first input terminal i1 of the RF power amplifier PA, and then determine the input power value Pin by setting the first operator 140 to obtain a more accurate input power value Pin of the RF power amplifier PA.

[0037] The first power factor cosα1 may be a cosine value of a phase angle between the input voltage signal Ui and the input current signal Ii.

[0038] The input power value Pin may 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 a 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 be provided with a first power factor cosα1 operator 130, that is, the first processing module 100 includes a first detector 110, a second detector 120 and a first operator 140; the two input terminals of the first operator 140 are respectively connected to the first detector 110 and the second detector 120, and the output terminal of the first operator 140 is connected to the third processing module 300. The first operator 140 is used to obtain an input power value Pin according to the input voltage signal Ui and the input current signal Ii respectively received at the two input terminals, and output the input power value Pin through the output terminal.

[0040] The input power value Pin may 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 also read Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a second processing module in an embodiment of the present 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 end of the RF power amplifier PA to obtain the output voltage signal Uo; the fourth detector 220 is used to connect to the output end of the RF power amplifier PA to obtain the output current signal Io.

[0042] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application, by setting the third detector 210 and the fourth detector 220, can achieve the acquisition of 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 a voltage sensor, and the second detector 120 and the fourth detector 220 may include a current sensor.

[0044] like Figure 1 , Figure 3As shown, the second processing module 200 also includes a second power factor operator 230 and a second operator 240; the two input ends of the second power factor operator 230 are respectively connected to the third detector 210 and the fourth detector 220, and the second power factor operator 230 is used to calculate the second power factor cosα2 according to the output voltage signal Uo and the output current signal Io respectively received by the two input ends, and output the second power factor cosα2 through the output end; the three input ends of the second operator 240 are respectively connected to the third detector 210, the fourth detector 220 and the output end of the second power factor operator 230, and the output end of the second operator 240 is connected to the third processing module 300, and the second operator 240 is used to calculate the output power value Pout according to the output voltage signal Uo, the output current signal Io and the second power factor cosα2 respectively received by the three input ends, and output the output power value Pout through the output end.

[0045] Therefore, the above-mentioned RF power amplifier protection device 10 in the present 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 operator 230, and determines the output power value Pout by setting the second operator 240 to obtain the output power value Pout of the RF power amplifier PA.

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

[0047] The output power value Pout may 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 also read Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a second processing module in another embodiment of the present application. Figure 1 , Figure 4As shown, the second processing module 200 also includes a third operator 250, a fourth operator 260 and a fifth operator 270; two input terminals of the third operator 250 are connected to the third detector 210 and the fourth detector 220 respectively, and the third operator 250 is used to calculate the load impedance value ZL according to the output voltage signal Uo and the output current signal Io respectively received at the two input terminals, and output the load impedance value ZL through the output terminal; one of the input terminals of the fourth operator 260 is connected to the output terminal of the third operator 250, and the other input terminal of the fourth operator 260 is used to receive the characteristic impedance value Z0, and the fourth operator 260 is used to calculate the load impedance value ZL according to the output voltage signal Uo and the output current signal Io respectively received at the two input terminals. The reflection coefficient modulus |Γ| is calculated based on the load impedance value ZL and the preset impedance value respectively received, and the reflection coefficient modulus |Γ| is output through the output end; two of the input ends of the fifth operator 270 are respectively connected to the output ends of the third detector 210 and the fourth operator 260, and the other input end of the fifth operator 270 is used to receive the characteristic impedance value Z0. The output end of the fifth operator 270 is connected to the third processing module 300. The fifth operator 270 is used to calculate the output power value Pout according to the output voltage signal Uo, the reflection coefficient modulus |Γ| and the characteristic impedance value Z0 respectively received at the three input ends, and output the output power value Pout through the output end.

[0049] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application 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 facilitate impedance matching between the RF power amplifier PA and the load RL, thereby protecting the RF power amplifier PA, by setting the third operator 250, the fourth operator 260 and the fifth operator 270 to perform a series of operations according to the output voltage signal Uo and the output current signal Io.

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

[0051] 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.

[0052] The preset constant may be 1.

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

[0054] Further, according to 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 the incident wave voltage value and the reflected wave voltage value are both related to the reflection coefficient modulus |Γ| and the effective value of the output voltage signal Uo, the fifth operator 270 is used to divide the square of the output voltage signal Uo by the preset impedance value to obtain a second operation value, that is, the fifth operator 270 divides the square of the effective value of the output voltage signal Uo by the preset impedance value to obtain the second operation value.

[0055] Please also read Figure 5 , Figure 5 FIG. 1 is a schematic diagram of a third processing module in an embodiment of the present application. Figure 1 , Figure 5 As shown, the third processing module 300 includes a sixth operator 310, the two input ends of the sixth operator 310 are respectively connected to the first processing module 100 and the second processing module 200, the output end of the sixth operator 310 is connected to the control module 400, and the sixth operator 310 is used to receive the input power value Pin and the output power value Pout, and perform a subtraction operation on the input power value Pin and the output power value Pout to obtain the loss power value Pd.

[0056] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application can determine the loss power value Pd of the RF power amplifier PA according to 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 include one or more integrated devices such as adders, subtractors, multipliers, dividers, etc.

[0058] In one or more embodiments, the working 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 the first power output state, the second power output state, and the stop output 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.

[0059] Therefore, the above-mentioned RF power amplifier protection device 10 in the present application, by setting the second power output state in which the RF power amplifier PA outputs a larger power value, can configure the control module 400 to further compare the loss power value Pd with the second preset value, and cooperate to control the RF power amplifier PA to be in a corresponding working state according to the relationship between the loss power value Pd and the first preset value and / or the relationship between the loss power value Pd and the second preset value, so as to protect the RF power amplifier PA more accurately.

[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 when the RF power amplifier PA is in the second power output state is greater than the power value of the RF signal RFS output when the RF power amplifier PA is in the first power output state. The control module 400 is used to control the RF power amplifier PA to be in the second power output state when the loss power 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 loss power 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 the stop output state when the loss power value Pd is greater than the first preset value.

[0061] Thus, the above-mentioned RF power amplifier protection device 10 in the present application, when the loss power value Pd is less than the second preset value, it indicates that the loss power value Pd is too small, and the RF power amplifier PA can be in the second power output state with a higher power value; when the loss power value Pd is greater than the second preset value and less than the first preset value, it indicates that the loss power value Pd is too large, and the RF power amplifier PA can be in the first power output state with a lower power value; when the loss power value Pd is greater than the first preset value, it indicates that the loss power value Pd is too large, and the RF power amplifier PA needs to be in a stop output state. Thus, the relationship between the loss power value Pd and the first preset value and the relationship between the loss power value Pd and the second preset value can further reflect the influence of the loss power value Pd on the RF power amplifier PA, and then the control module 400 can control the working 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 loss power value Pd that causes the working state to switch, wherein the first preset value can be the critical value of the loss power value Pd that switches between the first power output state and the stop output state, and the second preset value can be the critical value of the loss power value Pd that switches between the first power output state and the second power output state.

[0063] In one or more embodiments, the control module 400 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).

[0064] 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.

[0065] See also Figure 6 , Figure 6 FIG. 1 is a schematic diagram of a radio frequency power supply device in an embodiment of the present application. Figure 6 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.

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

[0067] 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.

[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 a load RL to provide electrical energy to the load RL.

[0069] 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.

[0070] 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: The RF power amplifier protection device is used to switch the working state of the RF power amplifier, the first input terminal of the RF power amplifier is used to input a DC voltage, the second input terminal of the RF power amplifier is used to input a crystal oscillator signal, and the RF power amplifier is used to amplify the power of the crystal oscillator signal according to the voltage value of the DC voltage to obtain a RF signal with a target power value, and output it to the load through the output terminal; Wherein, the radio frequency power amplifier protection device comprises: a first processing module, configured to be connected to the first input terminal of the RF power amplifier to obtain an input voltage signal and an input current signal at the first input terminal of the RF power amplifier, and obtain an input power value according to the input voltage signal and the input current signal; a second processing module, configured to be connected to the output end of the RF power amplifier to obtain an output voltage signal and an output current signal at the output end of the RF power amplifier, and obtain an output power value according to the output voltage signal and the output current signal; A third processing module, connected to the first processing module and the second processing module respectively, the third processing module is used to obtain a loss power value according to the input power value and the output power value; A control module is connected to the third processing module, and is used to control the RF power amplifier to be in a corresponding working state at least according to the relationship between the loss power value and the first preset value; 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 first processing module includes a first detector, a second detector, a first power factor operator and a first operator; the first detector is used to connect to the first input terminal of the radio frequency power amplifier to obtain the input voltage signal; The second detector is used to be connected to the first input terminal of the radio frequency power amplifier to obtain the input current signal; The two input ends of the first power factor operator are connected to the first detector and the second detector respectively. The first power factor operator is used to calculate the first power factor according to the input voltage signal and the input current signal respectively received by the two input ends, and output the first power factor through the output end; the three input ends of the first operator are connected to 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 to the third processing module, and the first operator is used to calculate the input power value according to the input voltage signal, the input current signal and the first power factor respectively received by the three input ends, and output the input power value through the output end.

3. The radio frequency power amplifier protection device according to claim 1, characterized in that: The second processing module includes a third detector and a fourth detector; the third detector is used to connect to the output end of the radio frequency power amplifier to obtain the output voltage signal; The fourth detector is used to be connected to the output end of the radio frequency power amplifier to obtain the output current signal.

4. The radio frequency power amplifier protection device according to claim 3, characterized in that: The second processing module also includes a second power factor operator and a second operator; the two input ends of the second power factor operator are respectively connected to the third detector and the fourth detector, and the second power factor operator is used to calculate the second power factor according to the output voltage signal and the output current signal respectively received by the two input ends, and output the second power factor through the output end; the three input ends of the second operator are respectively connected to the third detector, the fourth detector and the output end of the second power factor operator, and the output end of the second operator is connected to the third processing module, and the second operator is used to calculate the output power value according to the output voltage signal, the output current signal and the second power factor respectively received by the three input ends, and output the output power value through the output end.

5. The radio frequency power amplifier protection device according to claim 3, characterized in that: The second processing module also includes a third operator, a fourth operator and a fifth operator; two input ends of the third operator are connected to the third detector and the fourth detector respectively, and the third operator is used to calculate the load impedance value according to the output voltage signal and the output current signal respectively received at the two input ends, and output the load impedance value through the output end; one of the input ends of the fourth operator is connected to the output end of the third operator, and the other input end of the fourth operator is used to receive the characteristic impedance value. The fourth operator is used to calculate the reflection coefficient modulus value according to the load impedance value and the preset impedance value respectively received at the two input ends, and output the reflection coefficient modulus value through the output end; two of the input ends of the fifth operator are connected to the output ends of the third detector and the fourth operator respectively, and the other input end of the fifth operator is used to receive the characteristic impedance value. The output end of the fifth operator is connected to the third processing module, and the fifth operator is used to calculate the output power value according to the output voltage signal, the reflection coefficient modulus value and the characteristic impedance value respectively received at the three input ends, and output the output power value through the output end.

6. The radio frequency power amplifier protection device according to claim 5, characterized in that: The third operator is used to divide the output voltage signal by the output current signal to obtain the load impedance value; the fourth operator is used to divide the difference between the load impedance value and the preset impedance value by the 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 modulus value of the reflection coefficient; the fifth operator is used to divide the square of the output voltage signal by the preset impedance value to obtain a second operation value, and divide the difference between a preset constant and the square of the modulus value of the reflection coefficient by the square of the sum of the preset constant and the modulus value of the reflection coefficient to obtain a third operation value, and multiply the second operation value by the third operation value to obtain the output power value.

7. The radio frequency power amplifier protection device according to claim 1, characterized in that: The third processing module includes a sixth operator, two input ends of the sixth operator are respectively connected to the first processing module and the second processing module, the output end of the sixth operator is connected to the control module, and the sixth operator is used 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.

8. The radio frequency power amplifier protection device according to claim 1, characterized in that: The working state of the radio frequency power amplifier also includes a second power output state; The control module is used to control the RF power amplifier to be in the first power output state, the second power output state and the stop output state according to the relationship between the loss power value and the first preset value and / or the relationship between the loss power value and the second preset value.

9. The radio frequency power amplifier protection device according to claim 8, characterized in that: The second preset value is smaller than the first preset value, and a power value of the radio frequency signal output by the radio frequency power amplifier when in the second power output state is greater than a power value of the radio frequency signal output when in the first power output state; Wherein, the control module is used to control the RF power amplifier to be in the second power output state when the loss power value is less than the second preset value; to control the RF power amplifier to be in the first power output state when the loss power value is greater than the second preset value and less than the first preset value; and to control the RF power amplifier to be in the output stop state when the loss power value is greater than the first preset 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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