Overvoltage protection modules, systems and methods for power amplifiers

Abstract

This invention discloses an overvoltage protection module, system, and method for a power amplifier. The overvoltage protection module includes: a sampling and comparison circuit configured to acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage; and a processing circuit configured to obtain a control command based on the magnitude relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier, wherein the control command instructs the power amplifier to adjust or maintain its current operating mode, including a high-power operating mode and a low-power operating mode. This invention utilizes the high and low power operating mode characteristics of the power amplifier to achieve overvoltage protection for the power amplifier without requiring additional control circuitry, preventing damage due to overvoltage.

Description

Technical Field

[0001] This invention relates to the field of power amplifier technology, and in particular to an overvoltage protection module, system, and method for a power amplifier. Background Technology

[0002] Radio frequency (RF) power amplifiers typically use HBTs, CMOS (Complementary Metal-Oxide-Semiconductor Transistors), and HEMTs (High Electron Mobility Transistors) as amplifying transistors, referred to as power transistors. Power transistors require a certain DC voltage and / or DC current to operate; this is called biasing. If the bias circuit provides a DC voltage to the power transistor, it is called voltage biasing. If the bias circuit provides a DC current to the power transistor, it is called current biasing.

[0003] For RF power amplifiers, when the power supply voltage exceeds the normal operating voltage of the RF power amplifier, it will lead to an increase in the operating current and output power of the RF power amplifier, which will put the RF power transistor in an unfavorable environment of overvoltage and overheating, and will easily cause damage to the RF power transistor. Summary of the Invention

[0004] The purpose of this invention is to provide an overvoltage protection module, system, and method for a power amplifier, which can achieve overvoltage protection for the power amplifier without the need to add additional control circuitry to the power amplifier.

[0005] To achieve the above objectives, the present invention provides an overvoltage protection module for a power amplifier, comprising: a sampling comparison circuit and a processing circuit, wherein,

[0006] The sampling comparison circuit is configured to acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage.

[0007] The processing circuit is configured to generate control commands based on the relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain its current operating mode, which includes a high-power operating mode and a low-power operating mode.

[0008] Furthermore, preferably, the first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

[0009] Furthermore, preferably, instructing the power amplifier to adjust its current operating mode includes: instructing the power amplifier to adjust from a high-power operating mode to a low-power mode; instructing the power amplifier to maintain its current operating mode includes: instructing the power amplifier to maintain a high-power operating mode or instructing the power amplifier to maintain a low-power operating mode.

[0010] Furthermore, preferably, the processing circuit is specifically configured to generate a first control command when the first voltage is greater than a threshold voltage and the power amplifier is in a high-power operating mode. The first control command is used to instruct the power amplifier to adjust its current operating mode.

[0011] Furthermore, preferably, the processing circuit is specifically configured to generate a second control command when the first voltage is less than a first threshold voltage, the second control being used to instruct the power amplifier to maintain the current operating mode.

[0012] Furthermore, preferably, the processing circuit is specifically configured to generate a second control command when the power amplifier is in a low-power operating mode, the second control command being used to instruct the power amplifier to maintain the current operating mode.

[0013] The present invention also provides an overvoltage protection module for a power amplifier, comprising: a first sampling comparison circuit, a second sampling comparison circuit, and a processing circuit;

[0014] The first sampling comparison circuit is configured to acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the supply voltage of the power amplifier;

[0015] The second sampling comparison circuit is configured to acquire a second voltage and obtain the magnitude relationship between the second voltage and a second threshold voltage, wherein the second voltage is positively or negatively correlated with the power amplifier's supply voltage;

[0016] The processing circuit is configured to generate control commands based on the magnitude relationship between the first voltage and the first threshold voltage, the magnitude relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode, wherein the operating mode of the power amplifier includes a high-power operating mode and a low-power operating mode.

[0017] Furthermore, preferably, the first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage; the second voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

[0018] Furthermore, preferably, instructing the power amplifier to adjust its current operating mode includes: instructing the power amplifier to adjust from a high-power operating mode to a low-power mode; instructing the power amplifier to maintain its current operating mode includes: instructing the power amplifier to maintain a high-power operating mode or instructing the power amplifier to maintain a low-power operating mode.

[0019] Furthermore, preferably, the processing circuit is specifically configured to generate a first control command when the first voltage is greater than a first threshold voltage, the second voltage is less than a second threshold voltage, and the power amplifier is in a high-power operating mode. The first control command is used to instruct the power amplifier to adjust its current operating mode.

[0020] Furthermore, preferably, the processing circuit is specifically configured to generate a second control command when the first voltage is less than a first threshold voltage, the second voltage is less than a second threshold voltage, and the power amplifier is in a high-power operating mode, wherein the second control command is used to indicate the current operating mode of the power amplifier.

[0021] Furthermore, preferably, the processing circuit is specifically configured to generate a second control command when the second voltage is less than the second threshold voltage and the power amplifier is in a low-power operating mode, wherein the second control command is used to instruct the power amplifier to maintain the current operating mode.

[0022] The present invention also provides an overvoltage protection system for a power amplifier, comprising an overvoltage protection module and a power amplifier module as described in any of the preceding claims, wherein,

[0023] The overvoltage protection module is configured to generate control commands and send the control commands to the power amplifier module. The control commands are used to instruct the power amplifier to adjust or maintain its current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

[0024] The power amplifier module is configured to receive the control command and instruct the power amplifier to adjust or maintain its current operating mode according to the control command.

[0025] The present invention also provides an overvoltage protection method for a power amplifier, comprising:

[0026] A first voltage is collected, and the magnitude relationship between the first voltage and a first threshold voltage is obtained, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage;

[0027] Based on the relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier, a control command is generated. The control command is used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

[0028] Furthermore, preferably, the first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

[0029] The present invention also provides an overvoltage protection method for a power amplifier, comprising:

[0030] A first voltage is collected, and the magnitude relationship between the first voltage and a first threshold voltage is obtained, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage;

[0031] The second voltage is collected, and the relationship between the second voltage and the second threshold voltage is obtained, wherein the second voltage is positively or negatively correlated with the power amplifier's supply voltage;

[0032] Based on the relationship between the first voltage and the first threshold voltage, the relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier, a control command is generated. The control command is used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

[0033] Furthermore, preferably, the first voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier; the second voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier.

[0034] The overvoltage protection module for a power amplifier provided by this invention has the following advantages compared with the prior art:

[0035] This invention provides an overvoltage protection module for a power amplifier, comprising: a sampling circuit configured to acquire a first voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage; and a processing circuit configured to obtain a control command based on the relationship between the first voltage and a first threshold voltage and the power amplifier's current operating mode, wherein the control command instructs the power amplifier to adjust or maintain its current operating mode, the power amplifier's operating mode including a high-power operating mode and a low-power operating mode. This invention utilizes the high and low power operating mode characteristics of the power amplifier to achieve overvoltage protection for the power amplifier without requiring additional control circuitry, preventing damage to the power amplifier due to overvoltage. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of an overvoltage protection module for a power amplifier provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of a sampling comparison circuit provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a processing circuit provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of another power amplifier overvoltage protection module provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of another sampling and comparison circuit provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of another processing circuit provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of another sampling and comparison circuit provided in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the overvoltage protection system for a power amplifier provided in an embodiment of the present invention;

[0044] Figure 9 This is a schematic flowchart of an overvoltage protection method for a power amplifier provided in an embodiment of the present invention;

[0045] Figure 10 This is a schematic flowchart of another overvoltage protection method for a power amplifier provided in an embodiment of the present invention. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0048] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," "linked to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0049] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0051] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0052] Please see Figure 1 This invention provides an overvoltage protection module 100 for a power amplifier, comprising: a sampling and comparison circuit 101 and a processing circuit 102, wherein the sampling and comparison circuit 101 is configured to acquire a first voltage, wherein the first voltage is positively or negatively correlated with the power supply voltage of the power amplifier.

[0053] Specifically, it can be understood that the first voltage can directly or indirectly reflect changes in the supply voltage to monitor these changes. For example, the first voltage may have a positive correlation with the supply voltage of the power amplifier, meaning the first voltage increases as the supply voltage increases. Alternatively, the first voltage may have a negative correlation with the supply voltage, meaning the first voltage decreases as the supply voltage increases. The relationship between the first voltage and the supply voltage can be linear or non-linear.

[0054] In one embodiment, the first voltage can be the supply voltage itself; that is, in this embodiment, the sampling comparator circuit directly samples the supply voltage of the power amplifier.

[0055] It should be noted that the above-mentioned supply voltage can be the supply voltage Vcc of the power amplifier or the power supply voltage Vbat of the power amplifier circuit.

[0056] In one specific embodiment, the second voltage is directly or inversely proportional to the supply voltage of the power amplifier. The following explanation assumes a directly proportional relationship between the second voltage and the supply voltage of the power amplifier:

[0057] In a specific embodiment, the sampling comparison circuit 101 employs as follows: Figure 2 The circuit shown includes: a power supply voltage terminal Vcc, a first resistor R1, a second resistor R2, a first threshold voltage terminal Vref-1, and a first voltage comparator F1; wherein, the first end of the first resistor R1 is connected to the power supply voltage terminal Vcc, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the variable resistor R2 is grounded; the first end of the first voltage comparator F1 is connected to the first threshold voltage terminal Vref-1, the second end of the first voltage comparator F1 is connected to the first resistor R1, and the third end of the first voltage comparator F1 is connected to an external processing circuit; the first and second ends of the first voltage comparator F1 are input terminals, and the third end of the first voltage comparator F1 is an output terminal.

[0058] It should be noted that the first resistor R1 and the second resistor R2 can be either fixed resistors or variable resistors. Figure 2 The example uses R1 as a fixed resistor and R2 as a variable resistor.

[0059] In this embodiment, the connection point between the second end of the second resistor R2 and the second end of the first voltage comparator F1 is the sampling point of the first voltage.

[0060] In this embodiment, the input signal of the first voltage comparator F1 is voltage, and the output signal is high or low level, where 1 represents high level and 0 represents low level.

[0061] In the above embodiment, after the first voltage V1 and the first threshold voltage Vref-1 are passed through the first voltage comparator F1, the magnitude relationship between the first voltage V1 and the first threshold voltage Vref-1 can be obtained. When the first voltage comparator F1 outputs a high level value of 1, it means that the first voltage V1 is greater than the first threshold voltage Vref-1. When the first voltage comparator F1 outputs a low level value of 0, it means that the first voltage V1 is less than the first threshold voltage Vref-1.

[0062] Specifically, it can be understood that when the output of the first voltage comparator F1 is low (0), it indicates that the first voltage V1 is greater than the first threshold voltage Vref-1; when the output of the first voltage comparator F1 is high (1), it indicates that the first voltage V1 is less than the first threshold voltage Vref-1.

[0063] It should be noted that the first threshold voltage Vref-1 can be set according to actual needs. For example, Vref-1 can be set as Vref-1 = Vcc1 * (R2 / (R1 + R2)), where Vcc1 is the maximum Vcc voltage that the power amplifier can withstand when it is working normally. Specifically, Vcc1 can be understood as the maximum rated supply voltage of the power amplifier. The value of the first voltage V1 can also be changed by adjusting the resistance value of the second resistor R2.

[0064] The processing circuit 102 is configured to generate control commands based on the relationship between the first voltage V1 and the first threshold voltage Vref-1 and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode, which includes a high-power operating mode and a low-power operating mode.

[0065] In one embodiment, the processing circuit receives the Pre-HPM-EN signal, the Pre-LPM-EN signal, and the output signal from the sampling and comparison circuit 101, namely the Eos-1 signal, and outputs the HPM-EN signal and the LPM-EN signal based on these three signals. The Pre-HPM-EN signal and the Pre-LPM-EN signal are signals indicating the operating mode of a conventional power amplifier. Exemplarily, the terminal using this power amplifier can generate the corresponding Pre-HPM-EN signal and Pre-LPM-EN signal based on the needs of the usage scenario and feed them back to the power amplifier. For example, in a mobile terminal, the corresponding Pre-HPM-EN signal and Pre-LPM-EN signal can be generated and fed back to the power amplifier based on the distance between the mobile terminal and the corresponding base station: when the mobile terminal is close to the corresponding base station, a signal indicating that the power amplifier enters a low-power operating mode (e.g., Pre-LPM-EN = 1) is fed back; when the mobile terminal is far from the corresponding base station, a signal indicating that the power amplifier enters a high-power operating mode (e.g., Pre-HPM-EN = 1) is fed back. In this embodiment of the invention, the operating mode of the power amplifier is not directly determined by the Pre-HPM-EN signal and the Pre-LPM-EN signal, but is determined by the Pre-HPM-EN signal, the Pre-LPM-EN signal and the Eos-1 signal (i.e., the final HPM-EN signal and LPM-EN signal are output).

[0066] In one embodiment, the processing circuit 102 is designed using the truth table shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070] It should be noted that in Table 1, 1 and 0 represent high and low level signals, and X represents any signal (high level signal or low level signal).

[0071] In the embodiment of the above processing circuit, the first input port of the processing circuit 102 receives the high-power operating mode signal of the power amplifier, i.e., the Pre-HPM-EN signal. When the Pre-HPM-EN signal is high (1), it indicates that the power amplifier is in high-power operating mode; when the Pre-HPM-EN signal is low (0), it indicates that the power amplifier is not in high-power operating mode. The second input port of the processing circuit 102 receives the low-power operating mode signal of the power amplifier, i.e., the Pre-LPM-EN signal. When the Pre-LPM-EN signal is high (1), it indicates that the power amplifier is in low-power operating mode. When the Pre-LPM-EN signal is low (0), it indicates that the power amplifier is not in low-power operating mode. The third input port of the processing circuit 102 receives the output signal from the sampling comparator circuit 101, namely the Eos-1 signal. The first output port of the processing circuit 102 outputs the HPM-EN signal. When the HPM-EN signal is high (1), it indicates that the power amplifier connected to the processing circuit needs to execute high-power operating mode. The second output port of the processing circuit 102 outputs the LPM-EN signal. When the LPM-EN signal is high (1), it indicates that the power amplifier connected to the processing circuit needs to execute low-power operating mode.

[0072] In a specific embodiment, the processing circuit 102 employs, as shown below: Figure 3The circuit structure shown includes: a first AND gate Ag1, a second AND gate Ag2, a third AND gate Ag3, a first OR gate Og1, a first NOT gate Ig1, a second NOT gate Ig2, a third NOT gate Ig3, a first input port, a second input port, a third input port, a first output port, and a second output port; the first input port is connected to the first input node of the first AND gate Ag1, the input node of the second NOT gate Ig2, and the second input node of the third AND gate Ag3; the second input port is connected to the first input node of the second AND gate Ag2 and the input node of the third NOT gate Ig3; the third input port is connected to the input node of the first NOT gate Ig1 and the third AND gate... The third input node of Ag3 is connected; the output node of the first NOT gate Ig1 is connected to the second input node of the first AND gate Ag1; the output node of the second NOT gate Ig2 is connected to the second input node of the second AND gate Ag2; the output node of the third NOT gate Ig3 is connected to the first input node of the third AND gate Ag3; the output node of the first AND gate Ag1 is connected to the first output port; the output node of the second AND gate Ag2 is connected to the first input node of the first OR gate Og1; the output node of the third AND gate Ag3 is connected to the second input node of the first OR gate Og1; the output node of the first OR gate Og1 is connected to the second output port.

[0073] It should be noted that in the above-described processing circuit embodiments, the high-power operating mode signal and the low-power operating mode signal received by the processing circuit represent or indicate the current operating mode signal of the power amplifier. These signals can be directly obtained from external terminals or other modules, and the method of acquisition is not limited here.

[0074] In a specific embodiment, the processing circuit 102 is specifically configured to generate a first control command when the first voltage V1 is greater than the first threshold voltage Vref-1 and the power amplifier is in a high-power operating mode. The first control command is used to instruct the power amplifier to adjust the current operating mode.

[0075] In this embodiment, since there is a positive correlation between the first voltage V1 and the supply voltage Vcc, optionally, there is a direct proportional relationship between the first voltage V1 and the supply voltage Vcc. When the first voltage V1 is greater than the first threshold voltage Vref-1, it can be further concluded that the supply voltage Vcc at this time is greater than the rated supply voltage Ve of the power amplifier. If the power amplifier is still in high-power operating mode at this time, then a first control command will be generated and transmitted to the power amplifier through the processing circuit, instructing the power amplifier to adjust its operating mode. That is, instructing the power amplifier to adjust from high-power operating mode to low-power operating mode.

[0076] In this embodiment, the processing circuit 102 receives the output signal of the sampling comparison circuit 101 and combines it with the current operating mode of the power amplifier. When the first voltage V1 is greater than the first threshold voltage Vref-1 and the power amplifier is currently in a high-power operating mode, it can quickly generate a first control command to instruct the power amplifier to adjust its operating mode, thereby achieving overvoltage protection for the power amplifier and preventing damage to the power amplifier due to overvoltage.

[0077] In one specific embodiment, the processing circuit 102 is specifically configured to generate a second control command when the first voltage V1 is less than the first threshold voltage Vref-1. The second control command is used to instruct the power amplifier to maintain the current operating mode.

[0078] In this embodiment, since there is a proportional relationship between the first voltage V1 and the supply voltage Vcc, when the first voltage V1 in the processing circuit 102 is less than the first threshold voltage Vref-1, it can be further concluded that the supply voltage Vcc at this time is less than the rated voltage Ve of the power amplifier. Then, the second control command of this application will be triggered. The second control command is used to instruct the power amplifier to maintain the current working mode.

[0079] In this embodiment, the processing circuit 102 receives the output signal of the sampling and comparison circuit 102 and combines it with the current operating mode of the power amplifier. When the first voltage V1 is less than the first threshold voltage Vref-1, it can quickly generate a control command to instruct the power amplifier to maintain the existing operating mode, so that the power amplifier can operate normally and smoothly.

[0080] This embodiment provides an overvoltage protection module for a power amplifier, including a sampling and comparison circuit and a processing circuit. When the supply voltage is lower than the rated voltage of the power amplifier, it generates a control command to instruct the power amplifier to maintain its current operating mode, thus ensuring normal operation. For example, if the power amplifier is currently in a high-power mode, it instructs the power amplifier to maintain that high-power mode; if the power amplifier is currently in a low-power mode, it instructs the power amplifier to maintain that low-power mode.

[0081] It is understandable that since the power amplifier's supply voltage Vcc is less than its rated voltage Ve, the power amplifier will not be damaged by overvoltage, regardless of its operating mode.

[0082] In one specific embodiment, the processing circuit 102 is specifically configured to generate a second control command when the power amplifier is in a low-power operating mode. The second control command is used to instruct the power amplifier to maintain the current operating mode.

[0083] In this embodiment, since the power amplifier is in low-power mode, regardless of whether the power amplifier's supply voltage Vcc is greater than its rated voltage Ve, it is only necessary to keep the power amplifier in low-power mode. Because the power amplifier is in low-power mode, even if the supply voltage Vcc is greater than the power amplifier's rated voltage Ve, the power amplifier is not easily damaged due to overvoltage, which can further improve the power amplifier's operating efficiency.

[0084] In one specific embodiment, if the power amplifier's supply voltage Vcc exceeds the power amplifier's rated supply voltage Ve by a predetermined value, the power amplifier is turned off.

[0085] Specifically, it is understood that the aforementioned predetermined values ​​can be 0.4V, 0.6V, 0.8V, etc.

[0086] It should be noted that in this embodiment, when the power amplifier's supply voltage Vcc exceeds the rated supply voltage Ve of the power amplifier by a predetermined value, the risk of damage to the power amplifier increases significantly regardless of the power mode in which the power amplifier is operating. Therefore, at this time, the power amplifier can be turned off to better protect it from damage due to overvoltage.

[0087] This invention provides an overvoltage protection module for a power amplifier, comprising: a sampling and comparison circuit and a processing circuit. The sampling and comparison circuit is configured to acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage. The processing circuit is configured to obtain a control command based on the magnitude relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier. The control command instructs the power amplifier to adjust or maintain its current operating mode, which includes a high-power operating mode and a low-power operating mode. This invention utilizes the inherent high and low power operating mode characteristics of the power amplifier to achieve overvoltage protection for the power amplifier without requiring additional control circuitry, preventing damage due to overvoltage.

[0088] Please see Figure 4The present invention also provides an overvoltage protection module 200 for a power amplifier, comprising: a first sampling comparison circuit 201, a second sampling comparison circuit 202, and a processing circuit 203;

[0089] The first sampling comparison circuit 201 is configured to acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power supply voltage of the power amplifier.

[0090] Specifically, it can be understood that the first voltage can directly or indirectly reflect changes in the supply voltage to monitor these changes. For example, the first voltage may have a positive correlation with the supply voltage of the power amplifier, meaning the first voltage increases as the supply voltage increases. Alternatively, the first voltage may have a negative correlation with the supply voltage, meaning the first voltage decreases as the supply voltage increases. The relationship between the first voltage and the supply voltage can be linear or non-linear.

[0091] In one embodiment, the first voltage can be the supply voltage itself; that is, in this embodiment, the sampling comparator circuit directly samples the supply voltage of the power amplifier.

[0092] In one specific embodiment, the first voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier.

[0093] In one embodiment, the first voltage can be the supply voltage itself; that is, in this embodiment, the sampling comparator circuit directly samples the supply voltage of the power amplifier.

[0094] It should be noted that the above-mentioned supply voltage can be the supply voltage terminal voltage Vcc of the power amplifier or the power supply voltage Vbat of the power amplifier circuit. The following embodiments use the supply voltage terminal voltage Vcc as an example.

[0095] In a specific embodiment, the first sampling comparison circuit 201 employs as follows: Figure 2The circuit shown includes: a power supply voltage terminal Vcc, a first resistor R1, a second resistor R2, a first threshold voltage terminal Vref-1, and a first voltage comparator F1; wherein, the first end of the first resistor R1 is connected to the power supply voltage terminal Vcc, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the variable resistor R2 is grounded; the first end of the first voltage comparator F1 is connected to the first threshold voltage terminal Vref-1, the second end of the first voltage comparator F1 is connected to the first resistor R1, and the third end of the first voltage comparator F1 is connected to an external processing circuit; the first and second ends of the first voltage comparator F1 are input terminals, and the third end of the first voltage comparator F1 is an output terminal.

[0096] It should be noted that the first resistor R1 and the second resistor R2 can be either fixed resistors or variable resistors. Figure 2 The example uses R1 as a fixed resistor and R2 as a variable resistor.

[0097] In this embodiment, the connection point between the second end of the second resistor R2 and the second end of the first voltage comparator F1 is the sampling point of the first voltage.

[0098] In the above embodiment, after the first voltage V1 and the first threshold voltage Vref-1 are passed through the first voltage comparator F1, the magnitude relationship between the first voltage V1 and the first threshold voltage Vref-1 can be obtained. When the first voltage comparator F1 outputs a high level value of 1, it means that the first voltage V1 is greater than the first threshold voltage Vref-1. When the first voltage comparator F1 outputs a low level value of 0, it means that the first voltage V1 is less than the first threshold voltage Vref-1.

[0099] Specifically, it can be understood that when the output of the first voltage comparator F1 is low (0), it indicates that the first voltage V1 is greater than the first threshold voltage Vref-1; when the output of the first voltage comparator F1 is high (1), it indicates that the first voltage V1 is less than the first threshold voltage Vref-1.

[0100] It should be noted that the first threshold voltage Vref-1 can be set according to actual needs. For example, Vref-1 can be set as Vref-1 = Vcc1 * (R2 / (R1 + R2)), where Vcc1 is the maximum Vcc voltage that the power amplifier can withstand when it is working normally. Specifically, Vcc1 can be understood as the maximum rated supply voltage of the power amplifier. The magnitude of the first voltage V1 can also be changed by adjusting the resistance value of the second resistor R2.

[0101] In one embodiment, the second sampling comparison circuit 202 is configured to acquire a second voltage, wherein the second voltage is positively or negatively correlated with the supply voltage of the power amplifier.

[0102] Specifically, it can be understood that the second voltage can directly or indirectly reflect changes in the supply voltage to monitor these changes. For example, the second voltage may have a positive correlation with the supply voltage of the power amplifier, meaning the second voltage increases as the supply voltage increases. Alternatively, the second voltage may have a negative correlation with the supply voltage, meaning the second voltage decreases as the supply voltage increases. The relationship between the second voltage and the supply voltage can be linear or non-linear.

[0103] In one embodiment, the second voltage can be the supply voltage itself; that is, in this embodiment, the sampling comparator circuit directly samples the supply voltage of the power amplifier.

[0104] It should be noted that the above-mentioned supply voltage can be the supply voltage Vcc of the power amplifier or the power supply voltage Vbat of the power amplifier circuit.

[0105] In one specific embodiment, the second voltage is directly or inversely proportional to the supply voltage of the power amplifier. The following explanation assumes a directly proportional relationship between the second voltage and the supply voltage of the power amplifier:

[0106] In a specific embodiment, the second sampling comparison circuit 202 employs as follows: Figure 5 The circuit shown includes: a power supply voltage terminal Vcc, a third resistor R3, a fourth resistor R4, a second threshold voltage terminal Vref-2, and a second voltage comparator F2; wherein, the first terminal of the third resistor R3 is connected to the power supply voltage terminal Vcc, the second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is grounded; the first terminal of the second voltage comparator F2 is connected to the second threshold voltage terminal Vref-2, the second terminal of the second voltage comparator F2 is connected to the third resistor R3, and the third terminal of the second voltage comparator F2 is connected to an external processing circuit; the first and second terminals of the second voltage comparator F2 are input terminals, and the third terminal of the second voltage comparator F2 is an output terminal.

[0107] It should be noted that the third resistor R3 and the fourth resistor R4 can be either fixed resistors or variable resistors. Figure 5 The example uses the third resistor R3 as a fixed resistor and the fourth resistor R4 as a variable resistor.

[0108] In this embodiment, the connection point between the second terminal of the third resistor R3 and the second terminal of the second voltage comparator F2 is the sampling point of the second voltage.

[0109] In this embodiment, the input signal of the second voltage comparator F2 is voltage, and the output signal is high or low level, where 1 represents high level and 0 represents low level.

[0110] In the above embodiment, after the second voltage V2 and the second threshold voltage Vref-2 pass through the first voltage comparator F2, the magnitude relationship between the second voltage V2 and the second threshold voltage Vref-2 can be obtained. When the output of the second voltage comparator F2 is a high level value 1, it means that the second voltage V2 is greater than the second threshold voltage Vref-2. When the output of the second voltage comparator F2 is a low level value 0, it means that the second voltage V2 is less than the second threshold voltage Vref-2.

[0111] Specifically, it can be understood that when the output of the second voltage comparator F2 is low (0), it indicates that the second voltage V2 is greater than the second threshold voltage Vref-2; when the output of the second voltage comparator F2 is high (1), it indicates that the second voltage V2 is less than the second threshold voltage Vref-2.

[0112] It should be noted that the second threshold voltage Vref-2 can be set according to actual needs. For example, Vref-2 can be set as Vref-2 = Vcc2 * (R4 / (R3 + R4)), where Vcc2 is the sum of the maximum Vcc voltage that the power amplifier can withstand and a preset voltage value. Specifically, it can be understood that Vcc2 is the sum of the maximum rated supply voltage of the power amplifier and a preset voltage value. The preset voltage value can be 0.2V, 0.3V, 0.4V, 0.5V, or 0.6V, etc.

[0113] In the above embodiment, the second voltage V2 is the voltage of the power supply voltage terminal Vcc after passing through resistor R3. After the second voltage V2 and the second threshold voltage Vref-2 are passed through voltage comparator F2, the magnitude relationship between the second voltage V2 and the second threshold voltage Vref-2 can be obtained. When the output of the second voltage comparator F2 is a high level value 1, it means that the second voltage V2 is greater than the second threshold voltage Vref-2. When the output of the second voltage comparator F2 is a low level value 0, it means that the second voltage V2 is less than the second threshold voltage Vref-2.

[0114] It should be noted that the second threshold voltage Vref-2 can be set according to actual needs; the value of the second voltage V2 can also be changed by adjusting the resistance value of the fourth resistor R4.

[0115] The processing circuit 203 is configured to generate control commands based on the relationship between the first voltage V1 and the first threshold voltage Vref-1, the relationship between the second voltage V1 and the second threshold voltage Vref-2, and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode, wherein the operating mode of the power amplifier includes a high-power operating mode and a low-power operating mode.

[0116] In one embodiment, the processing circuit 203 receives the Pre-HPM-EN signal, the Pre-LPM-EN signal, the output signal of the first sampling comparison circuit 201, and the output signal of the second sampling comparison circuit 202, namely the Eos-1 signal and the Eos-2 signal, and outputs the HPM-EN signal and the LPM-EN signal based on these four signals. The Pre-HPM-EN signal and the Pre-LPM-EN signal are signals indicating the operating mode of a conventional power amplifier. Exemplarily, the terminal using this power amplifier can generate the corresponding Pre-HPM-EN signal and Pre-LPM-EN signal based on the needs of the usage scenario and feed them back to the power amplifier. For example, in a mobile terminal, the corresponding Pre-HPM-EN and Pre-LPM-EN signals can be generated and fed back to the power amplifier based on the distance between the mobile terminal and the corresponding base station. When the mobile terminal is close to the base station, the power amplifier is fed back a signal that enters a low-power operating mode (e.g., Pre-LPM-EN = 1), and when the mobile terminal is far from the base station, the power amplifier is fed back a signal that enters a high-power operating mode (e.g., Pre-HPM-EN = 1). However, in this embodiment of the invention, the operating mode of the power amplifier is not directly determined by the Pre-HPM-EN and Pre-LPM-EN signals, but rather by a combination of the Pre-HPM-EN, Pre-LPM-EN, Eos-1, and Eos-2 signals (i.e., the final HPM-EN and LPM-EN signals are output).

[0117] In this embodiment, the processing circuit 203 is designed using the truth table shown in Table 2:

[0118] Table 2

[0119]

[0120] It should be noted that in Table 2, 1 and 0 represent high and low level signals, and X represents any signal (high level signal or low level signal).

[0121] In the embodiment of the above processing circuit, the first input port of the processing circuit 203 receives the high-power operating mode signal of the power amplifier, i.e., the Pre-HPM-EN signal. When the Pre-HPM-EN signal is high (1), it indicates that the power amplifier is in high-power operating mode; when the Pre-HPM-EN signal is low (0), it indicates that the power amplifier is not in high-power operating mode. The second input port of the processing circuit 203 receives the low-power operating mode signal of the power amplifier, i.e., the Pre-LPM-EN signal. When the Pre-HPM-EN signal is high (1), it indicates that the power amplifier is in low-power operating mode; when the Pre-HPM-EN signal is low (0), it indicates that the power amplifier is not in high-power operating mode. The power amplifier is not in a low-power operating mode. The third input port of the processing circuit receives the signal output from the first sampling comparator circuit 201, i.e., the Eos-1 signal. The fourth input port of the processing circuit 203 receives the signal output from the second sampling comparator circuit 202, i.e., the Eos-2 signal. The first output port of the processing circuit 203 outputs the HPM-EN signal. When the HPM-EN signal is high (1), it indicates that the power amplifier connected to the processing circuit needs to execute a high-power operating mode. The second output port of the processing circuit 203 outputs the LPM-EN signal. When the LPM-EN signal is high (1), it indicates that the power amplifier connected to the processing circuit needs to execute a low-power operating mode.

[0122] In a specific embodiment, the processing circuit 203 employs, as follows: Figure 6The circuit shown includes: a first AND gate Ag1, a second AND gate Ag2, a third AND gate Ag3, a first OR gate Og1, a first NOT gate Ig1, a second NOT gate Ig2, a third NOT gate Ig3, a fourth NOT gate Ig4, a fifth NOT gate Ig5, a sixth NOT gate Ig6, a first input port, a second input port, a third input port, a fourth input port, a first output port, and a second output port; the first input port is connected to the first input node of the first AND gate Ag1, the input node of the second NOT gate Ig2, and the second input node of the third AND gate Ag3; the second input port is connected to the first input node of the second AND gate Ag2 and the input node of the third NOT gate Ig3; the third input port is connected to the input node of the first NOT gate Ig1 and the third input node of the third AND gate Ag3; the fourth input port is connected to the input nodes of the fourth NOT gate Ig4, the fifth NOT gate Ig5, and the sixth NOT gate Ig6. The output node of the first NOT gate Ig1 is connected to the second input node of the first AND gate Ag1; the output node of the second NOT gate Ig2 is connected to the second input node of the second AND gate Ag2; the output node of the third NOT gate Ig3 is connected to the first input node of the third AND gate Ag3; the output node of the fourth NOT gate Ig4 is connected to the third input node of the first AND gate Ag1; the output node of the fifth NOT gate Ig5 is connected to the third input node of the second AND gate Ag2; the output node of the sixth NOT gate Ig6 is connected to the fourth input node of the third AND gate Ag3; the output node of the first AND gate Ag1 is connected to the first output port; the output node of the second AND gate Ag2 is connected to the first input node of the first OR gate Og1; the output node of the third AND gate Ag3 is connected to the second input node of the first OR gate Og1; and the output node of the first OR gate Og1 is connected to the second output port.

[0123] It should be noted that both the first sampling comparison circuit 201 and the second sampling comparison circuit 202 output high and low level signals.

[0124] In the embodiment of the above processing circuit, the high-power operating mode signal and the low-power operating mode signal received by the processing circuit represent the current operating mode signal of the power amplifier. The above signals can be directly obtained from the external terminal, and the method of acquisition is not limited here.

[0125] In a specific embodiment, the processing circuit 203 is specifically configured to generate a first control command when the first voltage V1 is greater than the first threshold voltage Vref-1, the second voltage V2 is less than the second threshold voltage Vref-2, and the power amplifier is in a high-power operating mode. The first control command is used to adjust the power amplifier from the high-power operating mode to the low-power operating mode.

[0126] In this embodiment, since the first voltage V1 and the supply voltage Vcc, and the second voltage V2 and the supply voltage Vcc are positively correlated, optionally, the first voltage V1 and the supply voltage Vcc are directly proportional, and the second voltage V1 and the supply voltage Vcc are directly proportional. When the first voltage V1 is greater than the first threshold voltage Vref-1, the second voltage V2 is less than the second threshold voltage Vref-2. It can be further concluded that the supply voltage Vcc at this time is greater than the rated voltage Ve of the power amplifier. If the power amplifier is still in the high-power operating mode at this time, then a first control command will be generated and transmitted to the power amplifier through the processing circuit, so that the power amplifier adjusts its operating state, that is, instructs the power amplifier to adjust from the high-power operating mode to the low-power operating mode, so as to avoid the power amplifier from burning out due to overvoltage.

[0127] In this embodiment, the processing circuit 203 receives the output signals of the first sampling comparison circuit 201 and the second sampling comparison circuit 202, and combines them with the current operating mode of the power amplifier. When the first voltage V1 is greater than the first threshold voltage Vref-1, the second voltage V2 is less than the second threshold voltage Vref-2, and the power amplifier is currently in a high-power operating mode, it can quickly generate a first control command to instruct the power amplifier to adjust its operating mode, thereby achieving overvoltage protection for the power amplifier and preventing damage to the power amplifier due to overvoltage.

[0128] In a specific embodiment, the processing circuit 203 is specifically configured to generate a second control command when the first voltage V1 is less than the first threshold voltage Vref-1, the second voltage V2 is less than the second threshold voltage Vref-2, and the power amplifier is in a high-power operating mode. The second control command is used to instruct the power amplifier to maintain the current operating mode.

[0129] In this embodiment, the processing circuit 203 receives the output signal of the first sampling comparison circuit 201 and the output signal of the second sampling comparison circuit 202, and combines them with the current operating mode of the power amplifier. It can quickly generate a first control command to instruct the power amplifier to maintain the existing operating mode, so that the power amplifier can operate normally and smoothly.

[0130] In a specific embodiment, the processing circuit 203 is specifically configured to generate a second control command when the second voltage V2 is less than the second threshold voltage Vref-2 and the power amplifier is in a low-power operating mode, wherein the second control command is used to instruct the power amplifier to maintain the current operating mode.

[0131] In this embodiment, the processing circuit 203 receives the output signal of the first sampling comparison circuit 201 and the output signal of the second sampling comparison circuit 202, and combines them with the current operating mode of the power amplifier. It can quickly generate control commands to instruct the power amplifier to maintain the existing operating mode when the second voltage V2 is less than the second threshold voltage Vref-2 and the power amplifier is in a low-power operating mode, so that the power amplifier can operate normally and smoothly.

[0132] In a specific embodiment, when the first voltage V1 is greater than the first threshold voltage Vref-1 and the second voltage V2 is greater than the second threshold voltage Vref-2, it indicates that the power amplifier's supply voltage Vcc exceeds the rated supply voltage Ve of the power amplifier by too much, and the power amplifier needs to be turned off to protect it.

[0133] Specifically, it can be understood that the above range can be 0-0.4V, 0-0.6V, 0-0.8V, etc.

[0134] It should be noted that in this embodiment, since the power amplifier's supply voltage Vcc exceeds the rated supply voltage Ve of the power amplifier by too much, the risk of damage to the power amplifier increases significantly regardless of the power mode in which the power amplifier is operating. Therefore, in this case, the power amplifier can be turned off to better protect it from damage due to overvoltage.

[0135] It should be noted that the first sampling comparison circuit and the second sampling comparison circuit described above are not limited to... Figure 2 and Figure 5 The circuit diagram shown can also be used in other forms, for example, it can be used to... Figure 2 and Figure 5 In the case of combining them and using a shared power supply, such as... Figure 7 The circuit diagram shown.

[0136] This invention provides an overvoltage protection module for a power amplifier, comprising: a first sampling and comparison circuit, a second sampling circuit, and a processing circuit. The first sampling and comparison circuit is configured to acquire a first voltage and obtain the relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage. The second sampling and comparison circuit is configured to acquire a second voltage and obtain the relationship between the second voltage and a second threshold voltage, wherein the second voltage is positively or negatively correlated with the power amplifier's supply voltage. The processing circuit is configured to obtain a control command based on the relationship between the first voltage and the first threshold voltage, the relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier. The control command is used to adjust or maintain the operating mode of the power amplifier, wherein the operating mode of the power amplifier includes a high-power operating mode and a low-power operating mode. This invention utilizes the high and low power operating mode characteristics of the power amplifier to achieve overvoltage protection for the power amplifier without requiring additional control circuitry, and when the overvoltage value is small, preventing damage to the power amplifier due to overvoltage.

[0137] Please see Figure 8 The present invention also provides an overvoltage protection system 300 for a power amplifier, including an overvoltage protection module 301 and a power amplifier module 302 as described above.

[0138] The overvoltage protection module 301 is configured to generate control commands and send the control commands to the power amplifier module. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

[0139] The power amplifier module 302 is configured to receive the control command and, according to the control command, instruct the power amplifier to adjust or maintain the current operating mode.

[0140] In one specific embodiment, the power amplifier module 302 receives control commands from the overvoltage protection module 301 and adjusts or maintains the current operating state according to the control commands.

[0141] It should be noted that the power amplifier module 302 in the above embodiments includes one or more power amplifiers. Optionally, the power amplifier includes one or more power amplification transistors. Optionally, the power amplification transistor can be a BJT transistor or a field-effect transistor.

[0142] One embodiment of the present invention provides an overvoltage protection module for a power amplifier, comprising:

[0143] The processing circuit is configured to generate a first control command when the first voltage is greater than a first threshold voltage and the power amplifier is in a high-power operating mode. The first control command is used to cause the power amplifier to adjust its current operating mode. The first voltage is positively correlated with the power amplifier's supply voltage.

[0144] One embodiment of the present invention provides an overvoltage protection module for a power amplifier, comprising:

[0145] The processing circuit is configured such that when the power amplifier's supply voltage is greater than the rated voltage and the power amplifier is in a high-power operating mode, it generates a first control command, which is used to cause the power amplifier to adjust its current operating mode.

[0146] One embodiment of the present invention provides an overvoltage protection module for a power amplifier, comprising:

[0147] The processing circuit is configured such that when the power amplifier's supply voltage is greater than the rated voltage and the power amplifier is in a low-power operating mode, it generates a second control command, which is used to maintain the current operating mode of the power amplifier.

[0148] One embodiment of the present invention provides an overvoltage protection module for a power amplifier, comprising:

[0149] The processing circuit is configured to generate a first control command when the first voltage is greater than a first threshold voltage and the power amplifier is in a high-power operating mode. The first control command is used to cause the power amplifier to adjust its current operating mode. The first voltage is positively correlated with the power amplifier's supply voltage.

[0150] One embodiment of the present invention provides an overvoltage protection module for a power amplifier, comprising:

[0151] The processing circuit is configured to generate a second control command when the first voltage is greater than the first threshold voltage and the power amplifier is in a low-power operating mode. The second control is used to maintain the current operating mode of the power amplifier. The first voltage is positively correlated with the power amplifier's supply voltage.

[0152] An embodiment of the present invention provides an overvoltage protection circuit for a power amplifier, configured to adjust the power amplifier to a low-power operating mode when a first voltage is greater than a first threshold voltage and the power amplifier is in a high-power operating mode, wherein the first voltage is positively correlated with the power supply voltage of the power amplifier.

[0153] An embodiment of the present invention provides an overvoltage protection circuit for a power amplifier, configured to maintain the current operating mode of the power amplifier when a first voltage is greater than a threshold voltage and the power amplifier is in a low-power operating mode, wherein the first voltage is positively correlated with the power supply voltage of the power amplifier.

[0154] Please see Figure 9 The present invention also provides an overvoltage protection method for a power amplifier, comprising at least steps S10-S20, the specific steps of which are as follows:

[0155] S10. Acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage.

[0156] In this embodiment, the first threshold voltage is a reference voltage, which can be set according to the actual situation.

[0157] In a specific embodiment, the first voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier.

[0158] Specifically, preferably, the first voltage can be designed to be proportional to the supply voltage of the power amplifier.

[0159] S20. Based on the relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier, a control command is obtained, wherein the control command is used to instruct the power amplifier to adjust or maintain the current operating mode, and the operating mode of the power amplifier includes: a high-power operating mode and a low-power operating mode.

[0160] It should be noted that in this application, a voltage comparator is used to compare the magnitude relationship between the first voltage and the first threshold voltage. However, this application is not limited to using a voltage comparator to obtain the relationship between the first voltage and the first threshold voltage, and other methods can also be used to obtain the relationship.

[0161] Specifically, this can be understood as follows: by comparing the magnitude of the first voltage and the first threshold voltage, it can be further determined whether the current supply voltage is greater than the rated voltage of the power amplifier. Combined with the current operating mode of the power amplifier, a comprehensive judgment is made to obtain the control command. The specific judgment logic is as follows:

[0162] 1. When the first voltage is greater than the first threshold voltage and the power amplifier is in high power operating mode, a first control command is obtained. The first control command is used to instruct the power amplifier to adjust the current operating mode.

[0163] 2. When the first voltage is less than the first threshold voltage, a second control command is obtained. The second control is used to control the power amplifier to maintain the current operating mode.

[0164] 3. When the power amplifier is in a low-power operating mode, a second control command is obtained, which is used to instruct the power amplifier to maintain the current operating mode.

[0165] Please see Figure 10 The present invention also provides an overvoltage protection method for a power amplifier, comprising at least steps S100-S300, the specific steps of which are as follows:

[0166] S100. Acquire a first voltage and obtain the magnitude relationship between the first voltage and a first threshold voltage, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage.

[0167] In this embodiment, the first threshold voltage is a reference voltage, which can be set according to the actual situation.

[0168] In a specific embodiment, the first voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier.

[0169] Specifically, preferably, the first voltage can be designed to be proportional to the supply voltage of the power amplifier.

[0170] S200. Acquire the second voltage and obtain the magnitude relationship between the second voltage and the second threshold voltage, wherein the relationship between the second voltage and the power amplifier supply voltage is positively or negatively correlated.

[0171] In this embodiment, the second threshold voltage is a reference voltage, which can be set according to the actual situation.

[0172] In one specific embodiment, the second voltage is directly proportional to or inversely proportional to the supply voltage of the power amplifier.

[0173] Specifically, preferably, the second voltage can be designed to be proportional to the supply voltage of the power amplifier.

[0174] S300. Based on the relationship between the first voltage and the first threshold voltage, the relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier, a control command is obtained. The control command is used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

[0175] It should be noted that in this application, a voltage comparator is used to compare the magnitude relationship between the first voltage and the first threshold voltage. However, this application is not limited to using a voltage comparator to obtain the relationship between the first voltage and the first threshold voltage, and other methods can also be used to obtain the relationship.

[0176] Specifically, this can be understood as follows: by comparing the magnitudes of the first voltage and the first threshold voltage, and the magnitudes of the second voltage and the second threshold voltage, it is possible to further determine whether the current supply voltage is greater than the rated voltage of the power amplifier. Furthermore, if the supply voltage is greater than the rated voltage of the power amplifier, it is possible to further determine whether a preset voltage value has been exceeded. Combined with the current operating mode of the power amplifier, a comprehensive judgment is made to obtain the control command. The specific judgment logic is as follows:

[0177] 1. When the first voltage is greater than the first threshold voltage, the second voltage is less than the second threshold voltage, and the power amplifier is in a high-power operating mode, a first control command is obtained. The first control command is used to instruct the power amplifier to adjust the current operating mode.

[0178] 2. When the first voltage is less than the first threshold voltage, the second voltage is less than the second threshold voltage, and the power amplifier is in high power operating mode, a second control command is obtained, wherein the second control command is used to instruct the power amplifier to maintain the current power operating mode unchanged.

[0179] 3. When the second voltage is less than the second threshold voltage and the power amplifier is in a low-power operating mode, a second control command is obtained, wherein the second control command is used to instruct the power amplifier to maintain the current power operating mode unchanged.

[0180] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An overvoltage protection module for a power amplifier, characterized in that, include: The sampling comparison circuit and the processing circuit, wherein, The sampling comparison circuit is configured to acquire a first voltage, obtain the magnitude relationship between the first voltage and a first threshold voltage, and output a high level or low level to represent the magnitude relationship between the first voltage and the first threshold voltage, wherein the first voltage is positively or negatively correlated with the power supply voltage of the power amplifier. The processing circuit is configured to generate control commands based on the magnitude relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode, which includes a high-power operating mode and a low-power operating mode. The first input port of the processing circuit is used to receive a high-power operating mode signal, and the second input port of the processing circuit is used to receive a low-power operating mode signal. The levels of the high-power operating mode signal and the low-power operating mode signal are used to indicate the current operating mode of the power amplifier. The third input port of the processing circuit receives the output signal of the sampling and comparison circuit. The control command includes the signal output from the first output port of the processing circuit and the signal output from the second output port of the processing circuit. When the first output port of the processing circuit outputs a high level, the control command is used to instruct the power amplifier to enter a high-power operating mode. When the second output port of the processing circuit outputs a high level, the control command is used to instruct the power amplifier to enter a low-power operating mode.

2. The overvoltage protection module for the power amplifier according to claim 1, characterized in that, The first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

3. The overvoltage protection module for the power amplifier according to claim 1, characterized in that, The instruction to adjust the power amplifier to the current operating mode includes: instructing the power amplifier to switch from a high-power operating mode to a low-power operating mode; The instruction to maintain the current operating mode of the power amplifier includes: instructing the power amplifier to maintain a high-power operating mode or instructing the power amplifier to maintain a low-power operating mode.

4. The overvoltage protection module for the power amplifier according to claim 1, characterized in that, The processing circuit is specifically configured to generate a first control command when the first voltage is greater than the first threshold voltage and the power amplifier is currently in a high-power operating mode. The first control command is used to instruct the power amplifier to adjust the current operating mode of the power amplifier.

5. The overvoltage protection module for the power amplifier according to claim 1, characterized in that, The processing circuit is specifically configured to generate a second control command when the first voltage is less than a first threshold voltage. The second control command is used to instruct the power amplifier to maintain the current operating mode.

6. The overvoltage protection module for the power amplifier according to claim 1, characterized in that, The processing circuit is specifically configured to generate a second control command when the power amplifier is in a low-power operating mode. The second control command is used to instruct the power amplifier to maintain the current operating mode.

7. An overvoltage protection module for a power amplifier, characterized in that, include: The circuit comprises a first sampling comparison circuit, a second sampling comparison circuit, and a processing circuit, wherein... The first sampling comparison circuit is configured to acquire a first voltage, obtain the magnitude relationship between the first voltage and a first threshold voltage, and output a high level or low level to represent the magnitude relationship between the first voltage and the first threshold voltage, wherein the first voltage is positively or negatively correlated with the supply voltage of the power amplifier; The second sampling comparison circuit is configured to acquire a second voltage, obtain the magnitude relationship between the second voltage and a second threshold voltage, and output a high level or a low level to represent the magnitude relationship between the second voltage and the second threshold voltage, wherein the second voltage is positively or negatively correlated with the supply voltage of the power amplifier; The processing circuit is configured to generate control commands based on the magnitude relationship between the first voltage and the first threshold voltage, the magnitude relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier. The control commands are used to instruct the power amplifier to adjust or maintain the current operating mode, wherein the operating mode of the power amplifier includes: a high-power operating mode and a low-power operating mode. The first input port of the processing circuit is used to receive a high-power operating mode signal, and the second input port of the processing circuit is used to receive a low-power operating mode signal. The levels of the high-power operating mode signal and the low-power operating mode signal are used to indicate the current operating mode of the power amplifier. The third input port of the processing circuit receives the output signal of the first sampling comparison circuit, and the fourth input port of the processing circuit receives the output signal of the second sampling comparison circuit. The control command includes the signal output from the first output port of the processing circuit and the signal output from the second output port of the processing circuit. When the first output port of the processing circuit outputs a high level, the control command is used to instruct the power amplifier to enter a high-power operating mode. When the second output port of the processing circuit outputs a high level, the control command is used to instruct the power amplifier to enter a low-power operating mode.

8. The overvoltage protection module for the power amplifier according to claim 7, characterized in that, The first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage; the second voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

9. The overvoltage protection module for the power amplifier according to claim 7, characterized in that, The instruction to adjust the power amplifier to the current operating mode includes: instructing the power amplifier to switch from a high-power operating mode to a low-power operating mode; The instruction to maintain the current operating mode of the power amplifier includes: instructing the power amplifier to maintain a high-power operating mode or instructing the power amplifier to maintain a low-power operating mode.

10. The overvoltage protection module for the power amplifier according to claim 7, characterized in that, The processing circuit is specifically configured to generate a first control command when the first voltage is greater than a first threshold voltage, the second voltage is less than a second threshold voltage, and the power amplifier is currently in a high-power operating mode. The first control command is used to instruct the power amplifier to adjust its current operating mode.

11. The overvoltage protection module for the power amplifier according to claim 7, characterized in that, The processing circuit is specifically configured to generate a second control command when the first voltage is less than a first threshold voltage, the second voltage is less than a second threshold voltage, and the power amplifier is in a high-power operating mode. The second control command is used to instruct the power amplifier to maintain the current operating mode.

12. The overvoltage protection module for the power amplifier according to claim 7, characterized in that, The processing circuit is specifically configured to generate a second control command when the second voltage is less than the second threshold voltage and the power amplifier is in a low-power operating mode, wherein the second control command is used to instruct the power amplifier to maintain the current operating mode.

13. An overvoltage protection system for a power amplifier, characterized in that, Includes an overvoltage protection module and a power amplifier module as described in any one of claims 1-12, wherein, The overvoltage protection module is configured to generate control commands and send the control commands to the power amplifier module. The control commands are used to instruct the power amplifier to adjust or maintain its current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode. The power amplifier module is configured to receive the control command and, according to the control command, instruct the power amplifier to adjust or maintain the current operating mode.

14. An overvoltage protection method for a power amplifier, applied to the overvoltage protection module of the power amplifier as described in any one of claims 1-6, characterized in that, include: A first voltage is collected, and the magnitude relationship between the first voltage and a first threshold voltage is obtained, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage; Based on the relationship between the first voltage and the first threshold voltage and the current operating mode of the power amplifier, a control command is generated. The control command is used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

15. The overvoltage protection method for a power amplifier according to claim 14, characterized in that, The first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

16. An overvoltage protection method for a power amplifier, applied to the overvoltage protection module of the power amplifier as described in any one of claims 7-12, characterized in that, include: A first voltage is collected, and the magnitude relationship between the first voltage and a first threshold voltage is obtained, wherein the first voltage is positively or negatively correlated with the power amplifier's supply voltage; The second voltage is collected, and the relationship between the second voltage and the second threshold voltage is obtained, wherein the second voltage is positively or negatively correlated with the power amplifier's supply voltage; Based on the relationship between the first voltage and the first threshold voltage, the relationship between the second voltage and the second threshold voltage, and the current operating mode of the power amplifier, a control command is generated. The control command is used to instruct the power amplifier to adjust or maintain the current operating mode. The operating modes of the power amplifier include: a high-power operating mode and a low-power operating mode.

17. The overvoltage protection method for a power amplifier according to claim 16, characterized in that, The first voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage; the second voltage is directly proportional to or inversely proportional to the power amplifier's supply voltage.

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