Auxiliary control circuit, communication device and detection method of power amplifier module

Abstract

The present invention relates to an auxiliary control circuit, a communication device and a detection method for a power amplifier module. The auxiliary control circuit of the power amplifier module includes a current detection chip, a main control chip, a first voltage amplification unit and a second voltage amplification unit. The amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit. The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip. The output end of the first voltage amplification unit is electrically connected to the first measurement input end of the main control chip. The output end of the second voltage amplification unit is electrically connected to the second measurement input end of the main control chip. The detection input end of the current detection chip is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module. The main control chip is used to output a voltage signal corresponding to a set inflection point voltage from the voltage signals respectively output by the first voltage amplification unit and the second voltage amplification unit. The power amplifier current detection performance is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and particularly to an auxiliary control circuit for a power amplifier module, a communication device, and a detection method. Background Art

[0002] With the continuous development of power electronics technology, in various communication devices of modern communication systems, current detection of power amplifier modules is an essential link. Through current detection, the working current magnitude of the power amplifier module in the communication device can be determined, and at the same time, the detected working current magnitude can be used as an alarm or a power amplifier feedback control quantity in the communication system, etc. As an important part of the communication system, the main function of the power amplifier module is to amplify the communication signal in power to achieve the purpose of wider coverage and higher data transmission volume.

[0003] For the current detection of power amplifier modules, traditional current detection methods include detection with a current sensing resistor and an integrated operational amplifier, current mutual inductance detection, Hall sensor detection, opto-coupler isolation current detection, and capacitor isolation current detection, etc. However, in the process of implementing the present invention, the inventors found that the traditional power amplifier current detection methods have the problem of low detection performance. Summary of the Invention

[0004] Based on this, in view of the above problems existing in the traditional power amplifier current detection methods, it is necessary to provide an auxiliary control circuit for a power amplifier module, a power amplifier module, a communication device, a current detection method for a power amplifier module, a current detection device for a power amplifier module, and a computer-readable storage medium.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0006] On the one hand, the embodiments of the present invention provide an auxiliary control circuit for a power amplifier module, including a current detection chip, a main control chip, a first voltage amplification unit, and a second voltage amplification unit, and the amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit;

[0007] The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, the output end of the first voltage amplification unit is electrically connected to the first measurement input end of the main control chip, and the output end of the second voltage amplification unit is electrically connected to the second measurement input end of the main control chip;

[0008] The detection input end of the current detection chip is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module, and the main control chip is used to output a voltage signal corresponding to a set inflection point voltage from the voltage signals respectively output by the first voltage amplification unit and the second voltage amplification unit.

[0009] On the other hand, a power amplifier module is also provided, which includes a radio frequency link and an auxiliary control circuit of the above power amplifier module.

[0010] On yet another aspect, a communication device is also provided, which includes the above power amplifier module.

[0011] On still another aspect, a method for detecting the current of a power amplifier module is also provided, which is applied to an auxiliary control circuit of a power amplifier module. The auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit. The amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; the input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, and the detection input end of the current detection chip is used to access the voltage to be measured of the power supply path of the power amplifier tube of the power amplifier module;

[0012] The above method includes:

[0013] Obtaining the first voltage output by the first voltage amplification unit and the second voltage output by the second voltage amplification unit respectively; both the first voltage and the second voltage are the re-amplified voltages corresponding to the voltage to be measured amplified by the current detection chip;

[0014] Determining the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage is the product of the set inflection point current and the amplification factor of the first voltage amplification unit;

[0015] If the first voltage is less than the inflection point voltage, output the first voltage; the first voltage is used to determine the current of the power amplifier module.

[0016] On still another aspect, a device for detecting the current of a power amplifier module is also provided, which is applied to an auxiliary control circuit of a power amplifier module. The auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit. The amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; the input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, and the detection input end of the current detection chip is used to access the voltage to be measured of the power supply path of the power amplifier tube of the power amplifier module;

[0017] The device for detecting the current of the power amplifier module includes:

[0018] An acquisition module, configured to obtain the first voltage output by the first voltage amplification unit and the second voltage output by the second voltage amplification unit respectively; both the first voltage and the second voltage are the re-amplified voltages corresponding to the voltage to be measured amplified by the current detection chip;

[0019] A comparison module, configured to determine a comparison result between a first voltage and an inflection point voltage of a first voltage amplification unit; the inflection point voltage is a product of a set inflection point current and an amplification factor of the first voltage amplification unit;

[0020] An output module, configured to output the first voltage when the first voltage is less than the inflection point voltage; the first voltage is used to determine the current of the power amplifier module.

[0021] On the other hand, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method for detecting the current of the power amplifier module are implemented.

[0022] One of the above technical solutions has the following advantages and beneficial effects:

[0023] The auxiliary control circuit, communication device and detection method of the above power amplifier module apply two voltage amplification units with different amplification factors on the output side of the current detection chip. The main control chip can detect the static current of the power amplifier module based on the voltage output by the first voltage amplification unit with a larger amplification factor, and detect the working current of the power amplifier module based on the voltage output by the second voltage amplification unit with a smaller amplification factor. Since the static current is usually much lower than the working current and higher measurement accuracy is required, and the amplification factor of the first voltage amplification unit is larger than that of the second voltage amplification unit, high-precision measurement of the static current can be achieved. At the same time, the measurement accuracy of the working current of the power supply path of the power amplifier tube can also be well satisfied, realizing different detection accuracies for different current magnitudes, effectively solving the problem of low detection performance of the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a radio frequency link block diagram of one conventional power amplifier module;

[0025] Figure 2 is a schematic diagram of the voltage-current relationship curve of traditional power amplifier current detection;

[0026] Figure 3 is a first schematic structural diagram of the auxiliary control circuit of the power amplifier module in an embodiment;

[0027] Figure 4 is a schematic diagram of the voltage-current relationship curve of the power amplifier current detection in an embodiment of the present application;

[0028] Figure 5 is a second schematic structural diagram of the auxiliary control circuit of the power amplifier module in an embodiment;

[0029] Figure 6 is a third schematic structural diagram of the auxiliary control circuit of the power amplifier module in an embodiment;

[0030] Figure 7 Schematic diagram of the fourth structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0031] Figure 8 Schematic diagram of the structure of the power amplifier current detection circuit part of the communication device in an embodiment;

[0032] Figure 9 Schematic diagram of the process of the current detection method of the power amplifier module in an embodiment;

[0033] Figure 10 Schematic diagram of the process of the current detection method of the power amplifier module in another embodiment;

[0034] Figure 11 Schematic diagram of the process of the current detection method of the power amplifier module in yet another embodiment;

[0035] Figure 12 Schematic diagram of an application process of the current detection method of the power amplifier module in an embodiment;

[0036] Figure 13 Block diagram of the module structure of the current detection device of the power amplifier module in an embodiment. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] The power amplifier module mainly consists of two parts: a radio frequency link and an auxiliary control circuit. Among them, the radio frequency link part mainly consists of power amplifier devices such as a gain attenuation circuit, a pre-driver low-power amplifier transistor, a driver medium-power amplifier transistor, and a final-stage high-power amplifier transistor, cascaded with isolators, etc. According to the requirements of the power amplifier module gain size, the higher the gain requirement, the more two or more pre-driver stages can be cascaded. The auxiliary control circuit generally has any one or several of a power conversion circuit, a detection circuit, an IO external interface circuit, an alarm circuit, a control circuit, and a linearization circuit according to different functions. The radio frequency link block diagram of a common power amplifier module is as shown in Figure 1 shown.

[0040] Generally, the main core device of the power amplifier module is the power amplifier tube. There are various types of power amplifier tubes, and common ones are power amplifier tubes composed of materials such as LDMOS or GaN. The gain G and saturation power P of the power amplifier tube sat also have different grades. The gain of common power amplifier tubes is 17dB - 22dB. The saturation power P of the power amplifier tube sat has different grades such as 10W, 20W, 50W, 100W or 400W, etc. Engineers can select different power amplifier tubes according to actual application needs to achieve the purpose of power amplification and realize the corresponding link functions.

[0041] In order to amplify the input signal Pin to the gain and power values required for actual use in the entire communication system, usually power amplifier tubes of different power grades are cascaded for use to amplify the signal and achieve reasonable utilization of the gain and saturation power P of the power amplifier tube sat of the purpose. For power amplifier tubes, there are two relatively important indicators to be concerned about in actual use, namely the quiescent current and the operating current. The quiescent current is the current when no input power enters the power amplifier tube. The magnitude of the quiescent current is controlled by the gate voltage of the power amplifier tube (i.e., the gate voltages VGS1 and VGS2 as shown in Figure 1 ), and the quiescent current reflects the initial working state and the quiescent operating point of the power amplifier tube. The quiescent currents of power amplifier tubes with different saturation powers P sat are different. Generally speaking, the lower the saturation power P sat of the power amplifier tube, the lower the quiescent current. For example, the quiescent current of a 20W saturation power P sat is about 100mA - 200mA, and the quiescent current of a 400W saturation power P sat is about 1000mA - 2000mA.

[0042] The operating current is the dynamic current during operation compared to the quiescent current. The magnitude of the operating current of the power amplifier tube is related to the magnitude of the signal power entering the power amplifier tube, reflecting the efficiency and working state of the power amplifier tube. Through the operating current, it can be judged whether the power amplifier tube is in a normal working state, whether the efficiency is too high or too low, and the operating currents of power amplifier tubes with different efficiencies and different output powers are different. Taking the power amplifier module when powered by 28V and outputting 80W of RF power as an example, the approximate operating current range is 8A - 10A.

[0043] In traditional application scenarios, it is usually necessary to use a current detection chip to read the quiescent current of the power amplifier tube in order to automatically adjust and set the gate voltage of the power amplifier tube in the power amplifier module; use a current detection chip to read the operating current of the power amplifier tube in order to calculate the efficiency of the power amplifier module and determine whether the power amplifier module is abnormal. Commonly used current detection chips include INA138 and INA168 series chips from Texas Instruments (TI), MAX4173 and MAX4375 chips from MAXIM, and ADM4073 chips from Analog Devices (ADI). The integrated and optimized current detection IC chip has the characteristics of small size, high precision and good performance, and is widely used in printed circuit boards.

[0044] In the application of integrated current detection chips, no matter what kind of current detection chip it is, it mainly consists of the following three parts: a current sensing resistor, the detection chip body, and an external detection voltage amplification circuit. The implementation principle is that a current sensing resistor on the chip detection input terminal is connected to the current path to be measured. The flowing current will generate a voltage drop across the current sensing resistor. The detection chip body processes this voltage drop through an internal precision differential amplification circuit, and then the external detection voltage amplification circuit amplifies the detection voltage value corresponding to this voltage drop to an appropriate value and outputs it.

[0045] In actual applications, the inventor found that when traditional current detection chips are used in power amplifier modules, the difference between the quiescent current and the operating current of the power amplifier tube is relatively large. For example, the range of the quiescent current is 100 mA to 1200 mA, while the range of the operating current is 0 A to 10 A. The detection voltage finally output by the external detection voltage amplification circuit is that the detection voltage in the form of an analog signal is converted into a corresponding digital signal by an AD (analog-to-digital conversion) chip and enters the main control chip such as an MCU or other programmable logic circuits, and then processed by the main control chip, or directly converted and processed using the internal AD (analog-to-digital conversion) port of the main control chip. Generally, the maximum detection voltage of the analog input of the AD port cannot exceed 3.3 V or 5 V. Then there will be a problem in actual use. Suppose the maximum analog voltage that the main control chip of the power amplifier module can detect is 5 V, the maximum operating current of the power amplifier module is 10 A, the quiescent current of the driver stage is 150 mA, and the quiescent current of the final stage is 600 mA. When using a common current detection chip in cooperation with the main control chip for current detection, the detection voltage Vo output by this current detection chip and the detection current I calculated by the main control chip based on this detection voltage Vo are in a linear proportional relationship, as Figure 2 shown.

[0046] Vo = K * I; K is the slope, which is the current detection accuracy. The larger K is, it means that when the detected current I changes by the same amount, the detected voltage Vo is larger, and it is easier to be detected by the MCU or AD, etc., that is, the detection accuracy is higher. For example, when the detected current changes by 10 mA, if the detected voltage only changes by 0.5 mV, it is difficult to accurately detect the change of 0.5 mV at this time. However, if the detected current changes by 10 mA and the detected voltage changes by 10 mV. Then, the detected voltage of 10 mV can be accurately detected.

[0047] Taking the case where the detected current I in the current path to be detected is 10 A and the detected voltage output by the current detection chip is 5.0 V as an example, when I = 5 A, the detected voltage Vo = 2.5 V, that is, 1 A corresponds to 500 mV and 10 mA corresponds to 5 mV of current detection accuracy, and this current detection accuracy is fixed. In the actual use of the power amplifier module, a higher current detection accuracy is required when detecting the static current. For example, it can reach an accuracy of 10 mA corresponding to 10 mV to accurately detect the static current, which is beneficial for accurately controlling the static current of the gate voltage of the power amplifier transistor on the power amplifier module; when detecting the working current, since the working current is relatively large, therefore, a detection accuracy of 1 A corresponding to 50 mV (10 mA corresponding to 0.5 mV) can also meet the actual use requirements, such as current alarm. That is to say, on the power amplifier module, the current detection chip requires a higher detection accuracy when detecting the static current, while a lower detection accuracy can be required when detecting the working current, which cannot be achieved in the traditional current detection method.

[0048] Please refer to Figure 3 and Figure 4 To solve the problem of low detection performance in the power amplifier current detection method, in one embodiment, an auxiliary control circuit 100 of a power amplifier module is provided, including a main control chip 201, a current detection chip 12, a first voltage amplification unit 14, and a second voltage amplification unit 16. The amplification factor of the first voltage amplification unit 14 is greater than that of the second voltage amplification unit 16. The input ends of the first voltage amplification unit 14 and the second voltage amplification unit 16 are connected and electrically connected to the detection output end of the current detection chip 12. The output end of the first voltage amplification unit 14 is electrically connected to the first measurement input end of the main control chip 201. The output end of the second voltage amplification unit 16 is electrically connected to the second measurement input end of the main control chip 201. The detection input end of the current detection chip 12 is used to access the voltage to be measured of the power supply path of the power amplifier transistor of the power amplifier module. The main control chip 201 is used to output a voltage signal corresponding to the set inflection point voltage from the voltage signals respectively output by the first voltage amplification unit 14 and the second voltage amplification unit 16.

[0049] It can be understood that the current detection chip 12 is a current detection chip 12 existing in the art. The detection accuracy of the main control chip 201 is related to the output voltage amplification factor of the current detection chip 12. That is to say, the larger the amplification factor of the output voltage, the higher the detection accuracy of the main control chip 201. The amplification factor of the output voltage is determined by the resistance values of the current detection resistor R14 of the current detection chip 12 and the resistor R31 in the external amplification circuit. The specific resistance values can be selected according to the detection accuracy required in actual applications. After the current detection resistor R14 and the resistor R31 are determined, the output voltage amplification factor of the current detection chip 12 is determined and unchanged.

[0050] Both the first voltage amplification unit 14 and the second voltage amplification unit 16 can be various amplifiers or amplifier circuit modules with voltage signal amplification functions in the art. For example, but not limited to, operational amplifiers with different amplification factors, or resistors with different resistance values connected in parallel to the resistor R31 of the current detection chip 12 (connecting in parallel with the resistor R31 can change the amplification factor of the output voltage of the current detection chip 12 on this branch). Therefore, by adopting the first voltage amplification unit 14 and the second voltage amplification unit 16, in cooperation with the current detection chip 12 and the main control chip 201, the current of the power amplifier module is detected: when detecting the static current, the main control chip 201 uses the voltage signal output by the first voltage amplification unit 14 to detect the power amplifier current, so as to ensure the high accuracy required for static current detection and improve the grid voltage control accuracy of the power amplification tube of the power amplifier module. When detecting the working current, the main control chip 201 uses the voltage signal output by the second voltage amplification unit 16 to detect the power amplifier current, so as to meet the general accuracy required for working current detection and expand the applicable range of current detection.

[0051] The power supply path of the power amplifier tube of the power amplifier module also refers to the path through which the power supply of the power amplifier module supplies power to the driver-stage power amplifier tube and the final-stage power amplifier tube. The current detection resistor R14 in the detection input terminal of the current detection chip 12 is connected to the power supply path of the power amplifier tube in a traditional manner in the art, so that the current in the power supply path of the power amplifier tube (i.e., the current to be detected) can flow through the current detection resistor R14 in the detection input terminal of the current detection chip 12, so that the current detection chip 12 can detect the voltage corresponding to the static current flowing through its current detection resistor R14, that is, the static voltage. The working voltage when detecting the working current can be understood in the same way.

[0052] The main control chip 201 is an MCU or other type of control chip already available on the power amplifier module in the art, and has a radio frequency link control function, a current measurement function, and other control functions required by the power amplifier module. The main control chip 201 can be a control chip that comes with the auxiliary control circuit, or it can be a master control unit set on the power amplifier module, or it can be an auxiliary control chip independently set externally. The main control chip 201 is used to receive the voltage signals output by the first voltage amplification unit 14 and the second voltage amplification unit 16 respectively, and then calculate the corresponding static current or working current based on the voltage signal corresponding to the set inflection point voltage, so as to control the gate voltage adjustment of the power amplifier tube, or to complete the working current monitoring and early warning of the power amplifier module. The measurement input end of the main control chip 201 also refers to the AD port of the main control chip 201.

[0053] It should be noted that, for the sake of convenience, the present specification provides an illustration taking the INA138 series current detection chip 12 as an example, and the same can be said for other types of current detection chips 12. The set inflection point voltage refers to the inflection point voltage for switching between different detection accuracies. The set inflection point voltage is, for the power amplifier module, a voltage inflection point determined by a pre-set current inflection point. When the current in the power supply path of the power amplifier tube is less than the current inflection point, the required detection accuracy is high, and when the current is greater than the current inflection point, the required detection accuracy is relatively low. Therefore, the main control chip 201 can output a corresponding voltage signal for power amplifier current detection based on the comparison result of the size of the voltage signal output by the first voltage amplification unit 14 and the set inflection point voltage, so as to meet the different detection accuracy requirements under current detection of different sizes.

[0054] Specifically, when the power supply of the power amplifier module starts to supply power and drive, the current detection resistor R14 in the detection input terminal of the current detection chip 12 will generate a corresponding voltage. The current detection chip 12 differentially amplifies this voltage through its internal precision differential amplifier circuit and then outputs it. The voltage is further amplified by the first voltage amplification unit 14 and the second voltage amplification unit 16 respectively to form two voltage signals with different amplification degrees and output them to the main control chip 201. The main control chip 201 compares the voltage value of the voltage signal output by the first voltage amplification unit 14 with the set inflection point voltage. When the voltage value of the voltage signal output by the first voltage amplification unit 14 is less than the set inflection point voltage, the main control chip 201 outputs the voltage signal of the first voltage amplification unit 14 for subsequent current detection. In this way, the voltage signal of the first voltage amplification unit 14 with relatively high detection accuracy can be used for high-precision power amplifier current detection, meeting the precise static current control requirements of the gate voltage of the power amplification tube on the power amplifier module. For example, the voltage signal of the first voltage amplification unit 14 is used as the static voltage to calculate the static current in the initial state when the power amplifier module starts to work, so as to determine whether the static current conforms to the set static current (or called the standard static current). If not, the main control chip 201 can directly or indirectly control the gate voltage of the power amplification tube of the power amplifier module to adjust the static current to the set value.

[0055] When the voltage value of the voltage signal output by the first voltage amplification unit 14 is greater than the set inflection point voltage, the main control chip 201 can output the voltage signal of the second voltage amplification unit 16 for subsequent current detection. In this way, the voltage signal of the second voltage amplification unit 16 with relatively low detection accuracy can be used for power amplifier current detection with general detection accuracy, meeting the detection requirements of the working current on the power amplifier module. For example, the main control chip 201 can calculate the corresponding working current in real time based on the voltage signal of the second voltage amplification unit 16 during the working period after the power amplifier module starts up normally, so as to determine whether the working current is overcurrent. If so, the power amplifier current alarm function can be automatically completed. If not, the working current size of the power amplifier module can be continuously monitored or the working current size of the power amplifier module can be displayed in real time with the equipped display unit, etc. The detection accuracy change situation of the auxiliary control circuit 100 of the above power amplifier module is as Figure 4 shown.

[0056] The auxiliary control circuit 100 of the above power amplifier module applies two voltage amplification units with different amplification factors on the output side of the current detection chip 12. The main control chip 201 can detect the static current of the power amplifier module based on the voltage output by the first voltage amplification unit 14 with a larger amplification factor, and detect the working current of the power amplifier module based on the voltage output by the second voltage amplification unit 16 with a smaller amplification factor. Since the static current is usually much lower than the working current and requires higher measurement accuracy, and the amplification factor of the first voltage amplification unit 14 is larger than that of the second voltage amplification unit 16, high-precision measurement of the static current can be achieved. At the same time, the measurement accuracy of the working current in the power amplifier tube power supply path can also be well satisfied, supporting different detection accuracies for different current magnitudes, effectively solving the problem of low detection performance of traditional power amplifier current detection methods and achieving the effect of greatly improving the power amplifier current detection performance.

[0057] In one embodiment, the first voltage amplification unit 14 and / or the second voltage amplification unit 16 is a proportional operation amplifier circuit.

[0058] It can be understood that both the first voltage amplification unit 14 and the second voltage amplification unit 16 can adopt the proportional operation amplifier circuit in the art, or either the first voltage amplification unit 14 or the second voltage amplification unit 16 adopts the proportional operation amplifier circuit in the art, while the other adopts other types of amplifiers or resistors connected in parallel. The type of the applied proportional operation amplifier circuit can be determined according to the actually required voltage amplification factor. By applying the proportional operation amplifier circuit, the required voltage amplification effect can be achieved, and at the same time, the input-output characteristics of the proportional operation amplifier circuit can be utilized to improve the stability of the auxiliary control circuit 100 of the power amplifier module.

[0059] Please refer to Figure 5 , in one embodiment, the proportional operation amplifier circuit is a non-inverting proportional operation amplifier. It can be understood that in this embodiment, two non-inverting proportional operation amplifiers with different amplification factors can be adopted to respectively amplify the voltage signal output by the current detection chip 12 with different amplification factors, so as to meet the required current detection accuracy. At the same time, the characteristics of high input impedance and low output impedance of the non-inverting proportional operation amplifier can be utilized to improve the isolation degree between the current detection chip 12 and the main control chip 201 and improve the driving ability of the detected voltage in the circuit, thereby better improving the stability of the auxiliary control circuit 100 of the power amplifier module.

[0060] After the current to be detected, I, flows through the current detection resistor, R14, of the current detection chip 12, it is converted into a detection voltage, Vo, by the current detection chip 12. Different current detection chips 12 will have different corresponding relationships between the detection voltage, Vo, and the current to be detected, I, and the relationship between the detection voltage, Vo, and the current to be detected, I, satisfies Vo = K * I. K is the slope and can also be referred to as the current detection accuracy. The larger K is, the larger the voltage value when the current changes by the same value, and the more accurate the detection. By selecting the resistance values of resistor R1 and resistor R2, and resistor R3 and resistor R4, the amplification factors of the corresponding non-inverting proportional operational amplifiers are changed, and the amplified output voltage, U a Relationship with the input voltage Vo:

[0061]

[0062] For the output voltage, U, of the non-inverting proportional operational amplifier B b The relationship with the input voltage Vo is understood in the same way. The two non-inverting proportional operational amplifiers divide the detection voltage, Vo, output by the current detection chip 12 into two paths and perform amplification processing separately. Then, the voltage, U a = K * I * K a . K a is the amplification factor of the non-inverting proportional operational amplifier A. Similarly, the voltage, U b = K * I * K b . K b is the amplification factor of the non-inverting proportional operational amplifier B. Using the non-inverting proportional operational amplifier has two functions. One is that it can amplify the detection accuracy of the corresponding detected current to an appropriate value. The other is to utilize the characteristics of the high input impedance and low output impedance of the non-inverting proportional operational amplifier to improve the isolation degree between the current detection chip 12 and the main control chip 201, and also improve the driving ability of the detection voltage of the entire circuit, enabling the main control chip 201 to more accurately detect the magnitude of the voltage. In this embodiment, the amplification factor of the non-inverting proportional operational amplifier A is larger than that of the non-inverting proportional operational amplifier B.

[0063] The main control chip 201 will, based on the comparison results of U a and U b with the set inflection point voltage respectively, select different voltage outputs from U a and U b . Since U a and U bThe slopes are different, that is, for the same current to be detected, there will be two detected voltages entering the main control chip 201. The main control chip 201 can then adopt different detected voltage outputs according to the set inflection point voltage at different current values, so that a current to be detected finally corresponds to one detected voltage output and satisfies the proportional relationship between voltage and current, that is, the greater the current, the greater the voltage and the voltage curve is continuous.

[0064] Please refer to Figure 6 , in one embodiment, the auxiliary control circuit 100 of the above power amplifier module further includes a first voltage stabilizing circuit 18. The output end of the first voltage amplification unit 14 is electrically connected to the first measurement input end of the main control chip 201 through the first voltage stabilizing circuit 18.

[0065] It can be understood that the first voltage stabilizing circuit 18 is a circuit element or circuit module with voltage stabilization and limiting functions, and can be, but is not limited to, various types of voltage stabilizing devices or voltage stabilizing modules in the art. The magnitude of the stabilized voltage of the first voltage stabilizing circuit 18 can be determined according to the magnitude of the input voltage allowed by the first AD port connecting the first voltage amplification unit 14 on the main control chip 201 in the actual application scenario, as long as it can effectively prevent the detected voltage output by the first voltage amplification unit 14 from being too large and causing damage to the first AD port connecting the main control chip 201.

[0066] Specifically, a first voltage stabilizing circuit 18 is added at the output end of the first voltage amplification unit 14 as an overvoltage protection circuit for the output voltage. For example, if the maximum input voltage that the AD port of the main control chip 201 can withstand is 5V, a 5V first voltage stabilizing circuit 18 can be selected. When the detected voltage output by the first voltage amplification unit 14 is greater than 5V, the voltage stabilizing device in the first voltage stabilizing circuit 18 will conduct in the reverse direction, so that the maximum value of the detected voltage output will not exceed 5V, playing a role in protecting the circuit device. By applying the first voltage stabilizing circuit 18, it can effectively prevent overvoltage from occurring when a large current appears during the detection of the power amplifier current and damaging the circuit device, achieving the purpose of further improving the reliability of the circuit.

[0067] In one embodiment, as Figure 6 shown, the auxiliary control circuit 100 of the above power amplifier module further includes a second voltage stabilizing circuit 20. The output end of the second voltage amplification unit 16 is electrically connected to the second measurement input end of the main control chip 201 through the second voltage stabilizing circuit 20.

[0068] It can be understood that the second voltage stabilizing circuit 20 is a circuit component or circuit module with voltage stabilizing and limiting functions, which can be, but is not limited to, various types of voltage stabilizing devices or voltage stabilizing modules in the art. The magnitude of the stabilized voltage of the second voltage stabilizing circuit 20 can be determined according to the magnitude of the input voltage allowed by the second AD port connecting the second voltage amplifying unit 16 on the main control chip 201 in the actual application scenario, as long as it can effectively prevent the detection voltage output by the second voltage amplifying unit 16 from being too large and causing damage to the second AD port connecting the main control chip 201.

[0069] Specifically, adding the second voltage stabilizing circuit 20 between the output end of the second voltage amplifying unit 16 and the main control chip 201 can better provide overvoltage protection during the power amplifier current detection and avoid damage to the main control chip 201 caused by sudden overvoltage. By applying the second voltage stabilizing circuit 20, it is possible to more effectively prevent overvoltage from occurring when a large current appears during the power amplifier current detection and damaging the circuit components, achieving the purpose of further improving the circuit reliability.

[0070] In one embodiment, as Figure 6 shown, the first voltage stabilizing circuit 18 includes a voltage stabilizing diode D1. The second voltage stabilizing circuit 20 includes a voltage stabilizing diode D2. The positive electrode of the voltage stabilizing diode D1 is grounded. The negative electrode of the voltage stabilizing diode D1 is electrically connected between the output end of the first voltage amplifying unit 14 and the first measurement input end (i.e., the first AD port) of the main control chip 201. The positive electrode of the voltage stabilizing diode D2 is grounded. The negative electrode of the voltage stabilizing diode D2 is electrically connected between the output end of the second voltage amplifying unit 16 and the second measurement input end (i.e., the first AD port) of the main control chip 201.

[0071] It can be understood that the voltage stabilizing diode D1 and the voltage stabilizing diode D2 can be voltage stabilizing diodes of the same type but different models, and can be specifically determined according to the peak voltage magnitudes of the two voltage amplifying units and the maximum voltage detection range of the main control chip 201 in the actual application. By applying the above voltage stabilizing diodes D1 and D2, while effectively improving the circuit reliability of the auxiliary control circuit 100 of the power amplifier module, the circuit structure is simplified and the cost is relatively low.

[0072] In one embodiment, as Figure 6 shown, the auxiliary control circuit 100 of the above power amplifier module further includes a filter capacitor C1. One end of the filter capacitor C1 is electrically connected between the detection output end of the current detection chip 12 and the input end of the first voltage amplifying unit 14. The other end of the filter capacitor C1 is grounded.

[0073] It can be understood that in this embodiment, a filter capacitor C1 can also be connected between the detection output terminal of the current detection chip 12 and the input terminal of the first voltage amplification unit 14 to filter out the clutter on the detection output terminal of the current detection chip 12, making the output detection voltage more stable.

[0074] The parameter specifications of the filter capacitor C1 can be selected according to the power supply mode of the power amplifier module and the output characteristics of the current detection chip 12 in actual applications, as long as it can effectively provide the required clutter filtering function. By applying the above filter capacitor C1, a filtering effect is provided between the current detection chip 12 and the first voltage amplification unit 14, and between the current detection chip 12 and the second voltage amplification unit 16, making the output voltages of the two first voltage amplification units 14 more stable, eliminating the interference of clutter on the power amplifier current detection of the subsequent main control chip 201, and thus further improving the detection accuracy of the power amplifier current.

[0075] Please refer to Figure 7 , in one embodiment, the auxiliary control circuit 100 of the above power amplifier module further includes a gate voltage automatic adjustment circuit 22. The input terminal of the gate voltage automatic adjustment circuit 22 is electrically connected to the main control chip 201. The gate voltage automatic adjustment circuit 22 is used to adjust the gate voltage of the power amplifier tube of the power amplifier module after receiving the static current adjustment signal output by the main control chip 201.

[0076] It can be understood that the gate voltage automatic adjustment circuit 22 is a power amplification tube gate voltage adjustment circuit existing in the art. Specifically, during the operation of the power amplifier module, the detection voltage detected and output by the current detection chip 12 is filtered by the filter capacitor C1 to remove clutter, and then undergoes different degrees of amplification processing by the first voltage amplification unit 14 and the second voltage amplification unit 16 respectively, and then enters the main control chip 201, such as the MCU processing unit of the power amplifier module, through the voltage stabilizing diode D1 and the voltage stabilizing diode D2 respectively. The MCU processing unit compares the two input detection voltages with the set inflection point voltage. If the detection voltage output by the first voltage amplification unit 14 is less than the set inflection point voltage, the detection voltage output by the first voltage amplification unit 14 is selected for output corresponding to the detection of the static voltage (higher detection accuracy required), otherwise the detection voltage output by the second voltage amplification unit 16 is selected for output corresponding to the detection of the working voltage.

[0077] When the MCU processing unit detects a static current based on the detection voltage output by the first voltage amplification unit 14, it compares the static current with the set static current to determine whether the current static current is correct. If not, it will automatically generate a corresponding static current adjustment signal and output the static current adjustment signal to the gate voltage automatic adjustment circuit 22. After receiving the static current adjustment signal, the gate voltage automatic adjustment circuit 22 will adjust the gate voltage of the corresponding power amplifier tube according to the static current adjustment signal. In this way, after adjusting the gate voltage, the MCU processing unit detects the static current again based on the detection voltage output by the first voltage amplification unit 14 until the static current corresponding to the detected static voltage is consistent with the set static current or within the floating range allowed by the set static current. If so, the MCU processing unit will receive and detect the working current based on the detection voltage output by the second voltage amplification unit 16.

[0078] Through the collaborative application of the current detection chip 12, the main control chip 201 and the gate voltage automatic adjustment circuit 22, it is possible to effectively achieve high-precision static current detection while realizing automatic adjustment of the gate voltage of the power amplifier tube with high precision.

[0079] In one embodiment, as Figure 7 shown, the auxiliary control circuit 100 of the above power amplifier module further includes a power amplifier alarm circuit 24. The input end of the power amplifier alarm circuit 24 is electrically connected to the main control chip 201. The power amplifier alarm circuit 24 is used to perform over-current alarm on the working current of the power amplifier module after receiving the alarm signal output by the main control chip 201.

[0080] It can be understood that the power amplifier alarm circuit 24 is the power amplifier alarm circuit 24 provided in the traditional auxiliary control circuit in the field. Specifically, during the operation of the power amplifier module, the detection voltage detected by the current detection chip 12 is filtered by the filter capacitor C1 to remove clutter, and then undergoes different degrees of amplification processing by the first voltage amplification unit 14 and the second voltage amplification unit 16, and then enters the MCU processing unit through the voltage stabilizing diode D1 and the voltage stabilizing diode D2 respectively. The MCU processing unit detects the working current based on the detection voltage output by the second voltage amplification unit 16, and compares the detected working current with the set working current (or standard dynamic current) to determine whether the current working current is too large. If so, the MCU processing unit will automatically generate a corresponding alarm signal and output the alarm signal to the power amplifier alarm circuit 24. After receiving the alarm signal, the power amplifier alarm circuit 24 performs over-current alarm on the power amplifier module, such as uploading the relevant information of the current alarm to the main control unit of the device where the power amplifier module is located or an external total control system. If not, the MCU processing unit will continue to receive and detect the working current based on the detection voltage output by the second voltage amplification unit 16, or can output the data of the working current to the outside for external devices to perform linkage.

[0081] In one embodiment, a power amplifier module is further provided, which includes a radio frequency link and the auxiliary control circuit 100 of the above power amplifier module.

[0082] It can be understood that for the explanation of the auxiliary control circuit 100 of the power amplifier module in this embodiment, specific reference can be made to the relevant explanations in the respective embodiments of the auxiliary control circuit 100 of the above power amplifier module for the same understanding, and no further elaboration will be repeated here.

[0083] The above power amplifier module, through the combined application of the main control chip 201 and the auxiliary control circuit 100 of the above power amplifier module, enables the current detection accuracy to be variable during the power amplifier current detection process, can achieve high-precision measurement of the static current, and at the same time, the measurement accuracy of the working current of the power supply path of the power amplifier tube can also be well satisfied, rather than a current detection chip 12 completing the current detection of the entire process of the power supply path of the power amplifier tube, effectively solving the problems of low detection accuracy, poor applicability and unstable performance in the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection performance.

[0084] In one embodiment, a communication device 300 is further provided, which includes the above power amplifier module.

[0085] It can be understood by those skilled in the art that the above communication device 300 can be various devices in a communication system that apply the power amplifier module for power amplifier current detection and warning. The above communication device 300 may further include other components other than the power amplifier module, such as but not limited to a storage device, a transceiver antenna, and a data conversion circuit, etc.

[0086] The above communication device 300, by applying the above power amplifier module, can make the current detection accuracy variable during the power amplifier current detection process, can achieve high-precision measurement of the static current, and at the same time, the measurement accuracy of the working current of the power supply path of the power amplifier tube can also be well satisfied, effectively solving the problem of low detection performance in the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection performance.

[0087] Please refer to Figure 8 , in one embodiment, the above communication device 300 further includes a current display device 31. The current display device 31 is electrically connected to the main control chip 201 of the power amplifier module. After receiving the working current signal output by the main control chip 201, the current display device 31 is used to display the working current of the power amplifier module. The working current is the current corresponding to the working voltage of the power supply path of the power amplifier tube of the power amplifier module.

[0088] It can be understood that the current display device 31 is a display device with data display, or data display and broadcasting functions, such as a touch display, a non-touch display, or a common display screen without control input function. The current display device 31 can be independently set up as discrete components with the power amplifier module on the communication device 300, or can be integrated in an integrated package. The specific setting method can be determined according to the size and shape of the current display device 31, as well as the auxiliary functions (such as touch input, key input, or floating operation input, etc.).

[0089] Specifically, during the operation of the power amplifier module, the MCU processing unit obtains the corresponding working current based on the detection voltage output by the second voltage amplifier unit 16, and compares the working current with the set working current (or standard dynamic current) to determine whether the current working current is too large. If so, the MCU processing unit will link the power amplifier alarm circuit 24 to the power amplifier module to issue an overcurrent alarm for the working current. If not, the MCU processing unit will continue to receive and detect the working current based on the detection voltage output by the second voltage amplifier unit 16, and output the real-time working current to the current display device 31. The current display device 31 can display the real-time working current data in the form of numerical values ​​or curve graphs, or numerical values ​​and curve graphs, so that the operation and maintenance personnel can know the working current size of the power amplifier module in the communication device 300 at any time, thereby determining the working status of the power amplifier module.

[0090] Through the combined application of the power amplifier module and the current display device 31, the real-time display function of the working current can be realized during the working current detection process of the power amplifier module.

[0091] In one embodiment, the communication device 300 is any one of a repeater device, a radio frequency remote device, a track power amplifier device, an integrated power amplifier and a receiver.

[0092] It can be understood that the communication device 300 using the above power amplifier module can be any one of the repeater equipment, radio frequency remote equipment, track power amplifier equipment, integrated power amplifier and receiver in the field, so as to improve the power amplifier current detection accuracy of the equipment, thereby more accurately controlling the gate voltage of the power amplifier tube, and completing the functions of power amplifier alarm or current display. It can be understood by those skilled in the art that the above list is only a few common communication devices 300, and the above power amplifier module can also be used in other devices that need to have a power amplifier current detection function.

[0093] See also Figure 9, in one embodiment, a method for detecting the current of a power amplifier module is further provided, which is applied to the auxiliary control circuit of the power amplifier module. The auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit. The amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; the input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, and the detection input end of the current detection chip is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module.

[0094] The aforementioned method for detecting the current of the power amplifier module includes the following processing steps S12 to S16:

[0095] S12, respectively obtain the first voltage output by the first voltage amplification unit and the second voltage output by the second voltage amplification unit; both the first voltage and the second voltage are the re-amplified voltages corresponding to the voltage to be measured amplified by the current detection chip;

[0096] S14, determine the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is the product of the set inflection point current and the amplification factor of the first voltage amplification unit;

[0097] S16, if the first voltage is less than the inflection point voltage, output the first voltage; the first voltage is used to determine the current of the power amplifier module.

[0098] It can be understood that for the explanation of the auxiliary control circuit 100 of the power amplifier module in this embodiment, specifically, reference can be made to the relevant explanations in the respective embodiments of the above-mentioned auxiliary control circuit 100 of the power amplifier module for the same understanding, and details will not be repeated here.

[0099] Specifically, after the main control chip or an externally independently set processor obtains the first voltage and the second voltage from the output ends of the first voltage amplification unit and the second voltage amplification unit respectively, compares the first voltage with the inflection point voltage. When the first voltage is less than the inflection point voltage, that is, when the current to be measured is less than the set inflection point current (in the case where high detection accuracy is required), directly output the first voltage for subsequent current detection, such as the static current detection of the power amplifier. Since the amplification factor of the first voltage amplification unit is larger than that of the second voltage amplification unit, that is, the current detection accuracy based on the first voltage output by the first voltage amplification unit is higher, which is suitable for static current detection of the power amplifier module to ensure high-precision static current control of the power amplifier module.

[0100] The above current detection method for the power amplifier module can, through the above processing steps, achieve the current detection of the power amplifier module based on two detection voltages with different amplification degrees. In the static current detection scenario where high detection accuracy is required, the static current can be quickly detected based on the first voltage; and the power amplifier current detection with another detection accuracy can be supported based on the second voltage, effectively solving the problem of low detection performance of the traditional power amplifier current detection method and achieving the effect of greatly improving the power amplifier current detection performance.

[0101] Please refer to Figure 10 , in one embodiment, the above current detection method for the power amplifier module further includes the following step S18:

[0102] S18, if the first voltage is greater than the inflection point voltage, then output the second voltage; the second voltage is used to determine the current of the power amplifier module.

[0103] Specifically, when the first voltage is greater than the inflection point voltage, that is, when the current to be measured is greater than the set inflection point current (a situation where relatively low detection accuracy is required), the second voltage is used for subsequent current detection, such as the working current detection of the power amplifier module. Through the above processing steps, when detecting the working current of the power amplifier module, it can be achieved based on the second voltage, so that the measurement accuracy of the working current of the power amplifier tube power supply path is better satisfied, effectively improving the adaptability.

[0104] Please refer to Figure 11 , in one embodiment, the above method further includes the following step S20:

[0105] S20, if the first voltage is greater than the inflection point voltage, then output the third voltage; the third voltage is the sum of the difference between the inflection point voltages of the first voltage amplification unit and the second voltage amplification unit and the second voltage, and the third voltage is used to determine the current of the power amplifier module.

[0106] Specifically, when the first voltage is greater than the inflection point voltage, that is, when the current to be measured is greater than the set inflection point current (a situation where relatively low detection accuracy is required), the third voltage is used for subsequent current detection, such as the working current detection of the power amplifier module: For example, assume that the output voltage Vo of the current detection chip is 0.1*I. The voltages after the non-inverting proportional operational amplifier A and the non-inverting proportional operational amplifier B are U a = 2*I and U b = 0.2*I respectively. When I is less than 1A, the required detection accuracy is high, and when I is in the range of 1A to 10A, a large detection current range is required. Therefore, the non-inverting proportional operational amplifier A and the non-inverting proportional operational amplifier B provide two different current detection accuracies, where 1A (that is, the set inflection point current) is the detection current division point for different detection accuracies. Thus, when I = 0.5A, U a = 1.0V, Ub When U = 0.1V and I = 1A, a U = 2V, b When U = 0.2V and I = 2A, a U = 4V, b When the current I is less than 1A, the voltage U is adopted. a When the current I is greater than 1A, the voltage U is adopted. b .

[0107] In practical applications, when the current I is less than 1A, the final detected voltage output by the main control chip is U a . For more convenient use, the voltage U a and the voltage U b can be synthesized and output: when the current I is greater than 1A, the final detected voltage output by the main control chip is U = U b +(K a *I p -K b *I p ), where I p represents the set inflection point current, that is, U = (U b +2 - 0.2)V. When I = 0.5A, the detected voltage finally determined by the main control chip is 1.0V. When I = 1A, the detected voltage finally determined by the main control chip is 2V. When I = 1.5A, the detected voltage finally determined by the main control chip is 2.1V. When I = 2A, the detected voltage finally determined by the main control chip is 2.2V. In this way, it can be ensured that the voltage detection satisfies the corresponding relationship that the larger the current, the larger the voltage. At the same time, the corresponding curve of current and voltage is continuous, which is more convenient for practical use. For example, Figure 12 shown is a flowchart of one application scenario.

[0108] Please refer to Figure 13 . In one embodiment, a current detection device 400 for a power amplifier module is further provided, which is applied to the auxiliary control circuit of the power amplifier module. The auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit. The amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit. The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip. The detection input end of the current detection chip is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module.

[0109] The current detection device 400 of the aforementioned power amplifier module includes an acquisition module 41, a comparison module 43, and an output module 45. The acquisition module 41 is configured to respectively acquire a first voltage output by the first voltage amplification unit and a second voltage output by the second voltage amplification unit; both the first voltage and the second voltage are re-amplified voltages corresponding to the voltage to be detected after being amplified by the current detection chip. The comparison module 43 is configured to determine the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is the product of the set inflection point current and the amplification factor of the first voltage amplification unit. The output module 45 is configured to output the first voltage when the first voltage is less than the inflection point voltage; the first voltage is used to determine the current of the power amplifier module.

[0110] It can be understood that for the explanation of the auxiliary control circuit 100 of the power amplifier module in this embodiment, specific reference can be made to the relevant explanations in the respective embodiments of the auxiliary control circuit 100 of the aforementioned power amplifier module for the same understanding, and details will not be repeated here.

[0111] Through the cooperation of each module, the current detection device 400 of the power amplifier module can implement the current detection of the power amplifier module based on two detection voltages with different amplification degrees. In the static current detection scenario where high detection accuracy is required, the static current detection can be quickly realized based on the first voltage; and based on the second voltage, the power amplifier current detection with another detection accuracy can be supported, effectively solving the problem of low detection performance of the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection performance.

[0112] In one embodiment, the above output module is further configured to output the second voltage when the first voltage is greater than the inflection point voltage. The second voltage is used to determine the current of the power amplifier module.

[0113] In one embodiment, the above output module may specifically be further configured to output a third voltage when the first voltage is greater than the inflection point voltage. The third voltage is the sum of the difference between the inflection point voltage of the first voltage amplification unit and the inflection point voltage of the second voltage amplification unit and the second voltage, and the third voltage is used to determine the current of the power amplifier module.

[0114] For the specific limitations of the current detection device 400 of the power amplifier module, reference can be made to the corresponding limitations of the current detection method of the power amplifier module in the above text, and details will not be repeated here. Each module in the current detection device 400 of the aforementioned power amplifier module can be implemented in whole or in part through software, hardware, and their combinations. The above-mentioned modules can be embedded in the processor of the communication device in hardware form or be independent of it, or can be stored in the memory of the communication device in software form, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned modules.

[0115] In one embodiment, a communication device is further provided, which can be various communication devices in the field that need to detect the current of the power amplifier module. The communication device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are implemented: respectively obtain a first voltage output by a first voltage amplification unit and a second voltage output by a second voltage amplification unit; both the first voltage and the second voltage are re-amplified voltages corresponding to the voltage to be measured amplified by a current detection chip; determine the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is the product of a set inflection point current and the amplification factor of the first voltage amplification unit; if the first voltage is less than the inflection point voltage, output the first voltage; the first voltage is used to determine the current of the power amplifier module.

[0116] Those skilled in the art can understand that, in addition to the above-mentioned memory and processor, the communication device in this embodiment may further include other components, which can be specifically determined according to the structural composition and functions of the communication device in actual applications, and will not be elaborated one by one in this specification.

[0117] In one embodiment, when the processor executes the computer program, the additional steps or sub-steps in each embodiment of the above air interface bandwidth adaptive control method may also be implemented.

[0118] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: respectively obtain a first voltage output by a first voltage amplification unit and a second voltage output by a second voltage amplification unit; both the first voltage and the second voltage are re-amplified voltages corresponding to the voltage to be measured amplified by a current detection chip; determine the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is the product of a set inflection point current and the amplification factor of the first voltage amplification unit; if the first voltage is less than the inflection point voltage, output the first voltage; the first voltage is used to determine the current of the power amplifier module.

[0119] In one embodiment, when the computer program is executed by a processor, the additional steps or sub-steps in each embodiment of the above current detection method for the power amplifier module may also be implemented.

[0120] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus dynamic random access memory (Rambus DRAM, abbreviated as RDRAM), and interface dynamic random access memory (DRDRAM), etc.

[0121] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0122] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. An auxiliary control circuit for a power amplifier module, characterized in that, It includes a current detection chip, a main control chip, a first voltage amplification unit and a second voltage amplification unit, and the amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip. The output end of the first voltage amplification unit is electrically connected to the first measurement input end of the main control chip, and the output end of the second voltage amplification unit is electrically connected to the second measurement input end of the main control chip. The first voltage amplification unit is used to detect the static current of the power amplifier module, and the second voltage amplification unit is used to detect the working current of the power amplifier module; The detection input end of the current detection chip is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module, and the main control chip is used to output a voltage signal corresponding to a set inflection point voltage from the voltage signals respectively output by the first voltage amplification unit and the second voltage amplification unit. Among them, the main control chip compares the voltage value of the voltage signal output by the first voltage amplification unit with the set inflection point voltage. When the voltage value of the voltage signal output by the first voltage amplification unit is less than the set inflection point voltage, the main control chip outputs the voltage signal of the first voltage amplification unit.

2. The auxiliary control circuit for a power amplifier module according to claim 1, characterized in that, The first voltage amplification unit and / or the second voltage amplification unit is a proportional operation amplification circuit.

3. The auxiliary control circuit for a power amplifier module according to claim 2, characterized in that, The proportional operation amplification circuit is a non-inverting proportional operational amplifier.

4. The auxiliary control circuit for a power amplifier module according to claim 1 or 2, characterized in that, It further includes a first voltage stabilizing circuit, and the output end of the first voltage amplification unit is electrically connected to the first measurement input end of the main control chip through the first voltage stabilizing circuit.

5. The auxiliary control circuit for a power amplifier module according to claim 4, characterized in that, It further includes a second voltage stabilizing circuit, and the output end of the second voltage amplification unit is electrically connected to the second measurement input end of the main control chip through the second voltage stabilizing circuit.

6. The auxiliary control circuit for a power amplifier module according to claim 5, characterized in that, The first voltage stabilizing circuit includes a voltage stabilizing diode D1, and the second voltage stabilizing circuit includes a voltage stabilizing diode D2; The positive electrode of the voltage stabilizing diode D1 is grounded, and the negative electrode of the voltage stabilizing diode D1 is electrically connected between the output end of the first voltage amplification unit and the first measurement input end of the main control chip; The positive electrode of the voltage stabilizing diode D2 is grounded, and the negative electrode of the voltage stabilizing diode D2 is electrically connected between the output end of the second voltage amplification unit and the second measurement input end of the main control chip.

7. The auxiliary control circuit for a power amplifier module according to any one of claims 1 to 3, characterized in that, It further includes a grid voltage automatic adjustment circuit, and the input end of the grid voltage automatic adjustment circuit is electrically connected to the main control chip; The grid voltage automatic adjustment circuit is used to adjust the grid voltage of the power amplifier tube of the power amplifier module after receiving the static current adjustment signal output by the main control chip.

8. The auxiliary control circuit for a power amplifier module according to claim 7, characterized in that, It further includes a power amplifier alarm circuit, and the input end of the power amplifier alarm circuit is electrically connected to the main control chip. The power amplifier alarm circuit is used to perform over-current alarm on the working current of the power amplifier module after receiving the alarm signal output by the main control chip.

9. A power amplifier module, characterized in that, It includes a radio frequency link and an auxiliary control circuit of the power amplifier module according to any one of claims 1 to 8.

10. A communication device, characterized in that, It includes the power amplifier module according to claim 9.

11. The communication device according to claim 10, characterized in that, It further includes a current display device, and the current display device is electrically connected to the main control chip of the power amplifier module; After receiving the working current signal output by the master control chip, the current display device is used to display the working current of the power amplifier module; the working current is the current corresponding to the working voltage of the power supply path of the power amplifier tube of the power amplifier module.

12. A method for detecting the current of a power amplifier module, characterized in that, An auxiliary control circuit applied to a power amplifier module, the auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit, and the amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, and the detection input end of the current detection chip is used to access the voltage to be measured of the power supply path of the power amplifier tube of the power amplifier module; the first voltage amplification unit is used to detect the static current of the power amplifier module, and the second voltage amplification unit is used to detect the working current of the power amplifier module; The method includes: Obtaining the first voltage output by the first voltage amplification unit and the second voltage output by the second voltage amplification unit respectively; both the first voltage and the second voltage are the re-amplified voltages corresponding to the voltage to be measured amplified by the current detection chip; Determining the comparison result between the first voltage and the inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is the product of the set inflection point current and the amplification factor of the first voltage amplification unit; If the first voltage is less than the inflection point voltage, output the first voltage; the first voltage is used to determine the static current of the power amplifier module.

13. The method for detecting the current of a power amplifier module according to claim 12, characterized in that, The method further includes: If the first voltage is greater than the inflection point voltage, output the second voltage; the second voltage is used to determine the working current of the power amplifier module.

14. The current detection method of the power amplifier module according to claim 12, wherein, The method further includes: If the first voltage is greater than the inflection point voltage, output a third voltage; the third voltage is the sum of the difference between the inflection point voltage of the first voltage amplification unit and the inflection point voltage of the second voltage amplification unit and the second voltage, and the third voltage is used to determine the working current of the power amplifier module.

15. A current detection device for a power amplifier module, wherein, An auxiliary control circuit applied to a power amplifier module, the auxiliary control circuit of the power amplifier module includes a current detection chip, a first voltage amplification unit, and a second voltage amplification unit, and the amplification factor of the first voltage amplification unit is greater than that of the second voltage amplification unit; The input ends of the first voltage amplification unit and the second voltage amplification unit are connected and electrically connected to the detection output end of the current detection chip, and the detection input end of the current detection chip is used to access the voltage to be measured of the power supply path of the power amplifier tube of the power amplifier module; the first voltage amplification unit is used to detect the static current of the power amplifier module, and the second voltage amplification unit is used to detect the working current of the power amplifier module; The current detection device of the power amplifier module includes: An acquisition module, configured to respectively acquire the first voltage output by the first voltage amplification unit and the second voltage output by the second voltage amplification unit; both the first voltage and the second voltage are the re-amplified voltages corresponding to the voltage to be measured amplified by the current detection chip; A comparison module, configured to determine a comparison result between the first voltage and an inflection point voltage of the first voltage amplification unit; the inflection point voltage of the first voltage amplification unit is a product of a set inflection point current and an amplification factor of the first voltage amplification unit; An output module, configured to output the first voltage when the first voltage is less than the inflection point voltage; the first voltage is used to determine a quiescent current of the power amplifier module.

16. A computer-readable storage medium, on which a computer program is stored, wherein, When the computer program is executed by a processor, the steps of the current detection method of the power amplifier module according to any one of claims 12 to 14 are implemented.

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