CN113809997A - Power amplifier protection circuit, method and device and electronic equipment - Google Patents
Power amplifier protection circuit, method and device and electronic equipment Download PDFInfo
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- CN113809997A CN113809997A CN202111126315.7A CN202111126315A CN113809997A CN 113809997 A CN113809997 A CN 113809997A CN 202111126315 A CN202111126315 A CN 202111126315A CN 113809997 A CN113809997 A CN 113809997A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
Abstract
The application discloses a power amplifier protection circuit, a method, a device and electronic equipment, and belongs to the technical field of electronic equipment control. The power amplifier protection circuit comprises a radio frequency transceiver, a power amplifier, a coupler, an antenna, a power supply module and a protection module; the input end of the power amplifier is electrically connected with the radio frequency transceiver; three terminals of the coupler are respectively and electrically connected with the output end of the power amplifier, the antenna and the radio frequency transceiver; the power supply module is electrically connected with the power amplifier; the protection module is electrically connected between the power supply module and the power amplifier; the control end of the protection module and the control end of the power supply module are electrically connected with the radio frequency transceiver; when the power supply module is switched from the mode of supplying power to the power amplifier according to the envelope tracking power supply mode to the mode of supplying power to the power amplifier according to the average power tracking power supply mode, the radio frequency transceiver controls the protection module to provide protection for the power amplifier according to the feedback signal of the coupler.
Description
Technical Field
The application belongs to the technical field of electronic equipment control, and particularly relates to a power amplifier protection circuit, a method and a device and electronic equipment.
Background
With the advent of the 5G era, communication frequencies are increasing, and higher power requirements are being placed on Power Amplifiers (PA) for boosting radio frequency power in electronic devices.
Currently, the input power, the output power and the operating power supply voltage of the PA are strictly limited, and exceeding the limit value may cause the PA to operate in an unstable state, which easily causes the PA to burn out.
However, under an Envelope Tracking (ET) power supply scheme, external environment changes such as an increase in output power and a change in an antenna environment easily cause the PA to operate in an unstable state, which causes the PA to form positive feedback to generate a low-frequency self-excited signal or power reflection, and further causes the PA to burn out when an output voltage of the PA exceeds a tolerable range.
The prior art does not have good precautionary measures for the problems.
Disclosure of Invention
The embodiment of the application aims to provide a power amplifier protection method, which can solve the problem that the power amplifier is damaged due to overload work of the power amplifier caused by change of a working environment in an ET power supply mode in the prior art.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a power amplifier protection circuit, which includes a radio frequency transceiver, a power amplifier, a coupler, an antenna, a power module, and a protection module;
the input end of the power amplifier is electrically connected with the radio frequency transceiver;
three terminals of the coupler are respectively and electrically connected with the output end of the power amplifier, the antenna and the radio frequency transceiver;
the power supply module is electrically connected with the power amplifier;
the protection module is electrically connected between the power supply module and the power amplifier;
the control end of the protection module and the control end of the power supply module are electrically connected with the radio frequency transceiver;
when the power supply module supplies power to the power amplifier according to an envelope tracking power supply mode and switches to supply power to the power amplifier according to an average power tracking power supply mode, the radio frequency transceiver controls the protection module to provide protection for the power amplifier according to a feedback signal of the coupler.
In a second aspect, an embodiment of the present application provides a power amplifier protection method, where the method is applied to an electronic device, where the electronic device includes the power amplifier protection circuit of the first aspect;
the method comprises the following steps:
under the condition that the power amplifier is supplied with power according to an envelope tracking power supply mode, acquiring a feedback signal of the coupler and input power of the power amplifier;
determining the working state of the power amplifier according to the feedback signal and the input power;
controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state;
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
In a third aspect, an embodiment of the present application provides a power amplifier protection device, where the power amplifier protection device is applied to an electronic device, and the electronic device includes the power amplifier protection circuit of the first aspect;
the device comprises:
the first obtaining module is used for obtaining a feedback signal of the coupler and the input power of the power amplifier under the condition that the power amplifier is supplied with power according to an envelope tracking power supply mode;
the determining module is used for determining the working state of the power amplifier according to the feedback signal and the input power;
the first control module is used for controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state;
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
In a fourth aspect, the present application provides an electronic device, which includes the power amplifier protection circuit of the first aspect, and further includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method of the second aspect.
In a fourth aspect, the present application provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the second aspect.
In a fifth aspect, the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the second aspect.
In the embodiment of the application, the power amplifier protection circuit comprises a radio frequency transceiver, a power amplifier, a coupler, an antenna, a power supply module and a protection module; the input end of the power amplifier is electrically connected with the radio frequency transceiver; three terminals of the coupler are respectively and electrically connected with the output end of the power amplifier, the antenna and the radio frequency transceiver; the power supply module is electrically connected with the power amplifier; the protection module is electrically connected between the power supply module and the power amplifier; the control end of the protection module and the control end of the power supply module are electrically connected with the radio frequency transceiver; when the power supply module supplies power to the power amplifier according to the envelope tracking power supply mode and is switched to supply power to the power amplifier according to the average power tracking power supply mode, the radio frequency transceiver control protection module provides protection for the power amplifier according to a feedback signal of the coupler. In the protection circuit, the protection circuit is electrically connected between the power supply module and the power amplifier, the control end of the protection module and the control end of the power supply module are electrically connected with the radio frequency transceiver, and when the power supply module supplies power to the power amplifier according to an envelope tracking power supply mode and is switched to supply power to the power amplifier according to an average power tracking power supply mode, the protection circuit is controlled by the radio frequency transceiver to provide protection for the power amplifier through a feedback signal of the coupler in real time, so that the power amplifier is prevented from being damaged due to overload work. Therefore, the method solves the problem that the prior art cannot effectively prevent the power amplifier from being damaged due to overload work of the power amplifier caused by the change of the working environment in the ET power supply mode.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifier protection circuit in an embodiment of the present application;
fig. 2 is a flowchart illustrating steps of a power amplifier protection method according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a comparison of a self-excited signal and a normal signal in an embodiment of the present application;
FIG. 4 is a schematic diagram of a control logic of an electronic device in an embodiment of the present application;
FIG. 5 is a schematic diagram of another control logic of the electronic device in the embodiment of the present application;
FIG. 6 is a schematic structural diagram of a control device provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The display control method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a power amplifier protection circuit according to an embodiment of the present disclosure.
As shown in fig. 1, the power amplifier protection circuit 10 includes a radio frequency transceiver 11, a power amplifier 12, a coupler 13, an antenna 14, a power module 15, and a protection module 16;
the input of the power amplifier 12 is electrically connected to the radio frequency transceiver 11, so that the power amplifier 12 can receive the output signal of the radio frequency transceiver 11;
three terminals of the coupler 13 are electrically connected to the output terminal of the power amplifier 12, the antenna 14 and the radio frequency transceiver 11, respectively, so that the power amplifier 12 can receive the radio frequency signal sent by the radio frequency transceiver 11, amplify the radio frequency signal, enter the coupler 13, couple the radio frequency signal by the coupler 13, distribute the radio frequency signal to the antenna 14 for broadcasting, and send a feedback signal to the radio frequency transceiver 11;
the power supply module 15 is electrically connected with the power amplifier 12 and is used for transmitting the electric energy of the battery 17 to the power amplifier 12;
the protection module 16 is electrically connected between the power supply module 15 and the power amplifier 12;
the control end of the protection module 16 and the control end of the power module 15 are electrically connected to the rf transceiver 11, so that the protection module 16 and the power module 15 can both receive the control signal of the rf transceiver 11 and execute a corresponding control command;
when the power supply module 15 supplies power to the power amplifier 12 in the envelope tracking power supply mode and switches to supply power to the power amplifier 12 in the average power tracking power supply mode, the rf transceiver 11 controls the protection module 16 to provide protection for the power amplifier 12 according to the feedback signal of the coupler 13.
In the above circuit structure, the power supply module 15 is electrically connected between the battery 17 and the power amplifier 12, and can supply the electric energy of the battery 17 to the power amplifier 12 in an envelope tracking power supply mode or an average power tracking power supply mode; and because the control terminal of the protection module 16 and the control terminal of the power module 15 are both electrically connected to the rf transceiver 11, the rf transceiver 11 can control the power module 15 to supply power to the power amplifier 12 in the envelope tracking power supply mode or the average power tracking power supply mode according to the communication frequency requirement.
Specifically, the coupler 13 is electrically connected to the radio frequency transceiver 11 through the feedback signal circuit FBRX, and the power module 15 is electrically connected to the control port MIPI _1 of the radio frequency transceiver 11, so that the power module 15 can be controlled by the control port MIPI _1 to supply power to the power amplifier in the envelope tracking power supply mode or the average power tracking power supply mode.
Because the envelope tracking power supply mode is to control the power amplifier 12 to always work in a saturation state, the output power is controlled by adjusting the power supply voltage of the power amplifier 12, and the power supply capacitance provided for the power amplifier is small, so that a self-excitation signal is easily generated under the condition that the external factors are unstable, and the power amplifier 12 is forced to work in an overload mode; the average power tracking power supply mode adjusts the power supply voltage of the power amplifier according to the output power of the power amplifier 12 through an algorithm, and requires a large power supply capacitance provided for the power amplifier 12, and the large capacitance contributes to the stability of the power amplifier 12 and is not easy to generate a self-excitation phenomenon.
Therefore, when the control power module 15 supplies power to the power amplifier 12 in the envelope tracking power supply mode, and if the rf transceiver 11 determines that the power amplifier 12 has an unstable state such as a self-excitation phenomenon through the feedback signal of the coupler 13, the control power module 15 may be controlled to supply power to the power amplifier 12 in the average power tracking power supply mode, and the protection module 16 may be controlled to provide a large power supply capacitance to the power amplifier 12, so as to meet a capacitance requirement for supplying power to the power amplifier 12 in the average power tracking power supply mode. Because the supply voltage of the average power tracking supply mode is lower than that of the envelope tracking supply mode, self-excitation can be eliminated, the power amplifier 12 is restored to a stable working state, the power amplifier 12 is prevented from being burnt, and the power amplifier 12 is protected, so that the power amplifier is protected.
Optionally, the protection module 16 includes a capacitance unit C1, one end of the capacitance unit C1 is electrically connected between the power supply module 15 and the power amplifier 12, and the other end of the capacitance unit C1 is grounded, so that the capacitance unit C1 has a large capacitance characteristic;
the protection module 16 is specifically configured to switch the capacitance unit C1 from the first capacitance value to the second capacitance value when the power supply module 15 is switched from the envelope tracking power supply mode to the average power tracking power supply mode to supply power to the power amplifier 12, where the second capacitance value is greater than the first capacitance value, so as to meet a requirement that the average power tracking power supply mode needs to provide a larger power supply capacitance for the power amplifier 12.
Optionally, the protection module 16 further includes a switch unit M1, the other end of the capacitor unit C1 is grounded through a switch unit M1, and the switch unit M1 is configured to disconnect power supply to the power amplifier 12 in the envelope tracking power supply mode in the power supply module 15, so that the capacitor unit C1 is not grounded and becomes a small capacitor structure, so as to meet the smaller power supply capacitor requirement in the envelope tracking power supply mode; and when the power amplifier 12 is supplied with power in the average power tracking power supply mode, the capacitor unit is closed, so that the capacitor unit is grounded to form a large capacitor structure, and the requirement of a large power supply capacitor in the envelope tracking power supply mode is met.
Optionally, the switch unit M1 is a MOS transistor switch, a gate of the MOS transistor switch is electrically connected to the radio frequency transceiver 11, a first electrode of the MOS transistor switch is electrically connected to the other end of the capacitor unit C1, and a second electrode of the MOS transistor switch is grounded, so that the MOS transistor switch can receive a control signal of the radio frequency transceiver 11, and further control the capacitor unit C1 to be grounded or ungrounded.
Specifically, the gate of the MOS switch M1 is electrically connected to the control port GPIO _1 on the radio frequency transceiver, so that the MOS switch M1 can be controlled through the control port GPIO _ 1.
For example: when the GPIO _1 is at a high level, the M1 is controlled to be conducted, the C1 is grounded, namely, the power supply capacitor of the power amplifier meets the APT power supply requirement; when GPIO _1 is in low level, M1 is controlled to be turned off, C1 is controlled to be disconnected, namely, the power supply capacitor of the power amplifier meets the ET power supply requirement.
Referring to fig. 2, a flowchart illustrating steps of a power amplifier protection method according to an embodiment of the present application is shown, where the method is applied to an electronic device including the power amplifier protection circuit, and the method may include steps 100 to 300.
In an embodiment of the present application, the method is applied to an electronic device, the electronic device includes the power amplifier protection circuit, and the electronic device may be a mobile electronic device such as a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), or may also be a non-mobile electronic device such as a Personal Computer (PC), a Television (TV), a teller machine, or a self-service machine.
In the step 100, the feedback signal is a signal received when the coupler leads the signal output terminal of the power amplifier to the input terminal of the power amplifier in a coupled manner, and since the output terminal of the power amplifier is connected to the coupler, the output power of the power amplifier is monitored and controlled by the feedback signal, and the strength of the feedback signal is also the output power of the coupler; the input power is the power of the input signal Pin of the input power amplifier of the radio frequency transceiver.
In the step 100, that is, during the power amplifier performs the power amplification operation through the voltage in the ET power supply mode, the feedback signal of the coupler and the input power of the power amplifier are monitored in real time.
And 200, determining the working state of the power amplifier according to the feedback signal and the input power.
In the above step 200, since the output signal Pout of the power amplifier changes with the input signal under the condition that the Gain of the power amplifier is not changed, the power level of the output signal, i.e. the output power level, is monitored and controlled by the feedback signal, that is: therefore, according to the feedback signal and the input power, it can be determined in which operating state the power amplifier is in, i.e., whether the power amplifier is in an overload operating state or is about to enter the overload operating state.
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
In the step 300, because the envelope tracking power supply mode is to control the power amplifier to always work in a saturated state, the output power is controlled by adjusting the power supply voltage of the power amplifier, and the power supply capacitor provided for the power amplifier is small, a self-excitation signal is easily generated under the condition that the external factor is unstable, so that the power amplifier is forced to work in an overload manner; the average power tracking power supply mode is to adjust the power supply voltage of the power amplifier according to the output power of the power amplifier through an algorithm, and requires that the power amplifier has a large power supply capacitance, and the large capacitance is helpful for the stability of the power amplifier and is not easy to generate a self-excitation phenomenon.
Therefore, when the power amplifier is determined to be in an unstable working state, the power amplifier is powered by switching from the power supply mode according to the envelope tracking power supply mode to the power supply mode according to the average power tracking power supply mode, so that the self-excitation can be eliminated, the power amplifier is restored to the stable working state, and the purpose of protecting the power amplifier is achieved. In practical applications, the supply voltage of the average power tracking supply mode may be lower than the supply voltage of the envelope tracking supply mode, and the lower supply voltage helps to protect the power amplifier from being burned out.
In addition, when the power amplifier is in an unstable operating state, the most intuitive expression is that the output power of the power amplifier exceeds the tolerable range of the power amplifier, and the output signal of the power amplifier changes along with the change of the input signal, so that the output power of the power amplifier is reduced in a manner of reducing the input power of the power amplifier, the power amplifier is restored to the stable operating state, and the purpose of protecting the power amplifier is achieved.
According to the power amplifier protection method provided by the embodiment of the application, in the working process of a power amplifier, under the condition that the power amplifier is supplied with power according to an envelope tracking power supply mode, a feedback signal of a coupler and the input power of the power amplifier are obtained; determining the working state of the power amplifier according to the feedback signal and the input power; controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state; wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing the input power of the power amplifier. In the above manner, whether the power amplifier is in an unstable operating state is determined in real time through the feedback signal of the coupler and the input power of the power amplifier, and when the power amplifier is determined to be in the unstable operating state, the power amplifier is powered according to an average power tracking power supply mode, and/or the input power of the power amplifier is reduced, so that the power amplifier gets rid of the unstable operating state, and the power amplifier is prevented from being damaged due to overload operation. Therefore, the method solves the problem that the prior art cannot effectively prevent the power amplifier from being damaged due to overload work of the power amplifier caused by the change of the working environment in the ET power supply mode.
In the embodiment of the present application, the output end of the power amplifier is connected to the coupler, a Coupling coefficient (Cf) of the coupler is a fixed parameter, and the feedback signal strength is Pin + Gain-Cf, which shows that the feedback signal strength changes due to the change of Pin under the condition that Gain and Cf are not changed. In practical applications, the feedback signal is an FBRX signal, and thus the coupler output signal is an FBRX signal.
Optionally, in an implementation manner of the method for protecting a power amplifier according to an embodiment of the present invention, the step 200 includes a step 201, and the step 300 includes a step 301.
Step 201, determining whether the power amplifier is in a self-excited state according to the feedback signal and the input power.
The step 201 is to determine the operating state of the power amplifier by determining whether the power amplifier is in the self-excited state; specifically, in the case where it is determined that the power amplifier is in the self-excited state, it is determined that the power amplifier is in the unstable operation state.
The self-excited state can be judged by detecting a self-excited signal of the power amplifier, and when the self-excited signal is detected, the power amplifier is judged to be in the self-excited state; referring to fig. 3, a diagram illustrating the output power of the power amplifier in the embodiment of the present application showing the comparison of the free-running signal and the normal signal is shown. As shown in fig. 3, when the power amplifier has a self-excited phenomenon, its output power is gradually amplified due to the formation of positive feedback, thereby forming a self-excited signal Pout.
Step 301, when the power amplifier is in a self-excited state, the power amplifier is powered according to an average power tracking power supply mode.
In step 301, when the power amplifier generates a self-excited signal, the power amplifier is powered by switching from the power supply mode according to the envelope tracking power supply mode to the power supply mode according to the average power tracking power supply mode, so as to eliminate the self-excited factor, and the power amplifier is restored to the stable working state, thereby achieving the purpose of protecting the power amplifier.
Optionally, in an implementation manner of the power amplifier protection method provided by the embodiment of the present invention, the step 200 includes step 202, and the step 300 includes step 302.
Step 202, determining whether the peak output power of the power amplifier exceeds a preset output power range according to the feedback signal and the input power.
Step 202, determining the operating state of the power amplifier by determining whether the peak output power of the power amplifier exceeds the preset output power range; specifically, in the case where it is determined that the peak output power of the power amplifier is out of the preset output power range, it is determined that the power amplifier is in an unstable operating state.
The preset output power range is an output power range which can be borne by the power amplifier.
And 302, when the peak output power of the power amplifier exceeds a preset output power range, supplying power to the power amplifier according to the average power tracking power supply mode, and/or reducing the input power of the power amplifier.
In the step 302, because the output signal of the Power amplifier changes with the change of the input signal, and considering that the Peak-to-Average Power Ratio (PAPR) of the signals of different modulation schemes is not necessarily different under the condition of the same Power, like the Power of 23dBm, the CP-OFDM modulation scheme of the 5G n1 frequency band is higher than the Peak-to-Average Power Ratio of the SC-FDMA modulation scheme of the LTE B1 frequency band by about 3dB, that is, under the same Power, the higher the Peak-to-Average Power Ratio, the higher the Peak Power thereof, therefore it can be more accurately determined whether the Power amplifier is overloaded by monitoring the Peak output Power of the Power amplifier, and when the Peak output Power of the Power amplifier exceeds the preset output Power range of the Power amplifier, the output Power of the Power amplifier is reduced by reducing the input Power of the Power amplifier, that is, the output Power of the Power amplifier can be quickly reduced accordingly, therefore, the power amplifier is recovered to a stable working state, and the purpose of protecting the power amplifier is achieved.
Optionally, in step 302, when the peak output power of the power amplifier exceeds the preset output power range, determining a second difference between the peak output power of the power amplifier and an upper limit of the preset output power range, and then reducing the input power of the power amplifier according to the second difference; that is, the peak output power of the power amplifier and the preset output power range are controlled to reduce the input power, so that the power amplifier is restored to a stable working state.
In the step 302, considering that the self-excitation phenomenon is likely to occur when the output power of the power amplifier exceeds the tolerable range of the power amplifier, the power supply for the power amplifier in the envelope tracking power supply mode may be switched to the power supply for the power amplifier in the average power tracking power supply mode, so as to eliminate the self-excitation factor, and also recover the power amplifier to a stable working state, thereby achieving the purpose of protecting the power amplifier.
In step 302, when the output power of the power amplifier exceeds the tolerable range of the power amplifier, the power amplifier is switched from the envelope tracking power supply mode to the average power tracking power supply mode, and the input power of the power amplifier is reduced, so that the output power of the power amplifier can be reduced more significantly, and the power amplifier is controlled to be out of the unstable operating state quickly.
Optionally, in a specific embodiment, the step 300 further includes the step 303:
and when the power amplifier is in the self-excited state, the power amplifier is powered in the average power tracking power supply mode, and the input power of the power amplifier is reduced.
In this step 303, that is, when the power amplifier has a self-excitation phenomenon, the power supply for the power amplifier in the envelope tracking power supply mode is switched to the average power tracking power supply mode to supply power to the power amplifier, so as to eliminate the self-excitation factor, and at the same time, the input power of the power amplifier is reduced, so that the power amplifier can be controlled to get rid of the self-excitation state more quickly, thereby quickly controlling the power amplifier to get out of the unstable operating state to recover the power amplifier to the stable operating state, and achieving the purpose of protecting the power amplifier.
In the above embodiment, for an unstable operating state caused by self-excitation and output power exceeding a preset output power range, the operating load of the power amplifier can be reduced by controlling to switch from the power supply for the power amplifier in the envelope tracking power supply mode to the power supply for the power amplifier in the average power tracking power supply mode, and/or reducing the input power of the power amplifier, so as to alleviate the unstable degree of the operation of the power amplifier, thereby achieving the purpose of protecting the power amplifier.
Optionally, in a specific embodiment, the step of determining whether the power amplifier is in a self-excited state according to the feedback signal and the input power in the step 201 includes steps 2011 to 2014.
And 2011, determining the actual feedback power of the coupler according to the feedback signal.
In step 2011, the power of the output signal of the coupler, that is, the actual feedback power, is calculated and determined according to the measured feedback signal strength.
Step 2012, calculating theoretical feedback power of the coupler according to the input power.
In step 2012, since the feedback signal strength of the coupler is Pin + Gain-Cf and the Gain coefficient Gain and the coupling coefficient Cf are both fixed parameters, the feedback signal theoretically varies with Pin in a specific relationship, so that the theoretical power of the coupler feedback signal, that is, the theoretical feedback power of the coupler can be calculated by the input power of the power amplifier in combination with the Gain coefficient Gain and the coupling coefficient Cf.
Step 2013, determining that the power amplifier is in a self-excited state under the condition that a first difference value between the actual feedback power and the theoretical feedback power is larger than or equal to a preset power threshold value.
In step 2013, the preset power threshold is a coupler feedback signal strength deviation threshold for determining whether the power amplifier is in a self-excited state, and when a first difference between actual feedback power and theoretical feedback power of a coupler feedback signal is greater than or equal to the preset power threshold, it indicates that the feedback signal strength deviates from the theoretical value greatly, so that the power amplifier is determined to be in the self-excited state.
Step 2014, determining that the amplifier is not in a self-excited state when the first difference is smaller than the preset power threshold.
In step 2014, in case that the first difference between the actual feedback power and the theoretical feedback power of the coupler feedback signal is smaller than the preset power threshold, it indicates that the strength of the feedback signal deviates less from the theoretical value, and thus it is determined that the power amplifier is not in the self-excited state.
Setting the power of a PA input signal Pin to be 1dBm, setting the PA Gain Gain to be 25dBm, and setting the coupling coefficient Cf to be 23 dBm; the theoretical feedback power, e.g., FBRX Pin + Gain Cf 1+25-23 dBm 3dBm
If the preset power threshold X is set to 2dBm, the FBRX _ measured value is also the actual feedback power, and then:
1) when the FBRX _ measured value is larger than or equal to the FBRX _ expected value + X, 3+2 and 5dBm, judging the self-excitation, closing an ET power supply mode, and switching to an APT power supply mode;
2) when the FBRX _ measured value < FBRX _ expected value + X is 3+ 2-5 dBm, it is determined that the self-excitation is not performed, and the ET power supply mode is maintained
In the above embodiment, the feedback signal of the coupler is used to check the output power of the power amplifier, and determine whether the self-excitation phenomenon occurs, so as to control the power amplifier to enter a protection mode when the self-excitation phenomenon occurs, thereby implementing protection of the power amplifier.
Optionally, in an implementation manner, the power amplifier protection method provided in this embodiment of the present application further includes, after the step 300, steps 400 to 500.
And step 400, acquiring the actual working frequency band of the power amplifier.
In the step 400, because the frequency bands of the power amplifier actually operating are different for different communication base stations, and when the power amplifier operates in different operating frequency bands, factors causing the power amplifier to enter unstable operating states such as self-excitation are likely to change, so that the power amplifier is not likely to enter the unstable operating state again, the actual operating frequency band of the power amplifier needs to be obtained in real time.
And 500, under the condition that the actual working frequency band is changed, supplying power to the power amplifier according to an envelope tracking power supply mode.
In the step 500, since the power of the output signal of the power amplifier is different when the power amplifier operates in different operating frequency bands, and the corresponding operating states of the power amplifier are also different, when the actual power frequency band is changed, for example, when the frequency band is switched over, the factor causing the power amplifier to enter the unstable operating state is likely to have changed, so that the protection mode can be exited first, that is, the power amplifier is continuously supplied with power according to the envelope tracking power supply mode, and when the peak output power of the power amplifier does not exceed the preset output power range, the input power of the power amplifier is reduced according to the reduction of the input power of the power amplifier, so as to save the electric energy as much as possible on the premise of protecting the power amplifier.
Optionally, in a specific embodiment, the above-mentioned supplying power to the power amplifier in the average power tracking supply mode includes step 304; the above-mentioned power amplifier is powered in the envelope tracking power supply mode, including step 501.
In this embodiment, since the battery supplies power to the power amplifier through the power module, and the power module has two power supply modes, which are an average power tracking power supply mode and an envelope tracking power supply mode, the power module can be controlled to perform power supply to the power amplifier according to the average power tracking power supply mode or power supply to the power amplifier according to the envelope tracking power supply mode.
And step 304, controlling the power supply module to provide voltage to the power amplifier through an average power tracking technology, and controlling the switch unit to be conducted so as to enable the capacitor unit to be grounded.
In step 301, since the average power tracking power supply mode requires a larger power bypass capacitor of the power amplifier, and the envelope tracking power supply mode requires a smaller power bypass capacitor of the power amplifier, the power bypass capacitors of the power amplifiers are different for the average power tracking power supply mode, one end of the capacitor unit is electrically connected between the power module and the power amplifier, and the other end of the capacitor unit is grounded through the switch unit, when the power amplifier needs to be powered according to the average power tracking power supply mode, the power module is controlled to provide voltage to the power amplifier through the average power tracking technology, and the switch is controlled to be turned on, so that the capacitor unit is grounded, thereby changing the capacitor unit into a large capacitor and satisfying the power bypass capacitor requirement of the power amplifier in the average power tracking power supply mode, and further, the power amplifier can be supplied in an average power tracking supply mode. In the case of grounding, the capacitance value of the capacitor unit satisfies the capacitance requirement of the average power tracking power supply mode, for example, 1 uF.
In step 501, because one end of the capacitor unit is electrically connected between the power module and the power amplifier, and the other end of the capacitor unit is grounded through the switch, when the power amplifier needs to be powered according to the envelope tracking power supply mode, the power module is controlled to provide voltage to the power amplifier through the envelope tracking technology, and the switch is controlled to be turned off, so that the capacitor unit is turned off, the capacitor unit is changed into a small capacitor, the requirement of the power amplifier on the power bypass capacitor in the envelope tracking power supply mode is met, and further the power amplifier can be powered according to the envelope tracking power supply mode.
Optionally, the switch is an MOS transistor switch, a gate of the MOS transistor switch is electrically connected to the radio frequency transceiver, a first electrode of the MOS transistor switch is electrically connected to the other end of the capacitor unit, and a second electrode of the MOS transistor switch is grounded.
Optionally, when the MOS transistor switch needs to be controlled to be turned on, a first level signal is sent to the MOS transistor switch to control the MOS transistor switch to be turned on, so that the capacitor unit is grounded; when the MOS tube switch needs to be controlled to be switched off, a second level signal is sent to the MOS tube switch to control the MOS tube switch to be switched off, so that the capacitor unit is switched off. The first level signal may be a high level signal, and the second level signal may be a low level signal.
In the above embodiment, the capacitor unit is controlled to switch between a larger capacitor satisfying the average power tracking power supply mode and a smaller capacitor satisfying the envelope tracking power supply mode in a manner of controlling the switch to ground or open the circuit of the capacitor unit, so that the power amplifier is conveniently powered according to the average power tracking power supply mode or according to the envelope tracking power supply mode.
Referring to fig. 4, a schematic diagram of a control logic of an electronic device in an embodiment of the present application is shown.
As shown in fig. 4, in step 401, when the power amplifier starts to work, the MOS transistor is controlled to be turned off, and the power supply is controlled to provide the power supply voltage of the envelope tracking technology, so as to supply power to the power amplifier according to the envelope tracking power supply mode;
in step 402, judging whether the power amplifier is in a self-excited state by comparing the actual feedback power of the coupler with the theoretical feedback power of the coupler, and entering step 403 when the power amplifier is determined to be in the self-excited state;
in step 403, the MOS transistor is controlled to be turned on, and the power supply is controlled to provide the average power tracking technology supply voltage, so as to supply power to the power amplifier according to the average power tracking supply mode;
in step 404, it is detected whether the operating frequency band of the power amplifier is changed, and when the operating frequency band of the power amplifier is changed, step 401 is re-entered, otherwise, the state of step 403 is maintained.
Referring to fig. 5, a schematic diagram of another control logic of an electronic device in an embodiment of the present application is shown.
As shown in fig. 5, in step 501, when the power amplifier starts to work, the MOS transistor is controlled to be turned off, and the power supply is controlled to provide the power supply voltage of the envelope tracking technology, so as to supply power to the power amplifier according to the envelope tracking power supply mode;
in step 502, detecting an output peak power of the power amplifier by the PBRX circuit;
in step 503, comparing the output peak power of the power amplifier with a preset output power range, and determining whether the output peak power of the power amplifier exceeds the preset output power range, if so, entering step 504, otherwise, continuously detecting the output peak power of the power amplifier;
in step 504, reducing the input power of the power amplifier to make the output peak power of the power amplifier meet the specified requirement;
in step 505, the MOS transistor is controlled to be turned on, and the power supply is controlled to provide the average power tracking technology supply voltage, so as to supply power to the power amplifier according to the average power tracking supply mode;
in step 506, it is detected whether the operating frequency band of the power amplifier is changed, and when the operating frequency band of the power amplifier is changed, step 501 is entered again, otherwise, the state of step 502 is maintained.
It should be noted that, in the power amplifier protection method provided in the embodiment of the present application, the execution subject may be an electronic device, or a power amplifier protection module in the electronic device, which is used for executing the loaded power amplifier protection method. In the embodiment of the present application, a method for controlling loading performed by an electronic device is taken as an example to describe a method for protecting a power amplifier provided in the embodiment of the present application.
Referring to fig. 6, a schematic structural diagram of a power amplifier protection device provided in an embodiment of the present application is shown, and as shown in fig. 6, a power amplifier protection device 60 provided in an embodiment of the present application is applied to an electronic device, where the electronic device includes a radio frequency transceiver, a power amplifier, a coupler, and an antenna, and the radio frequency transceiver, the power amplifier, the coupler, and the antenna are electrically connected in sequence, and the device includes:
a first obtaining module 61, configured to obtain a feedback signal of the coupler and an input power of the power amplifier when the power amplifier is powered in an envelope tracking power supply mode;
a determining module 62, configured to determine an operating state of the power amplifier according to the feedback signal and the input power;
a first control module 63, configured to control the power amplifier to enter a protection mode when it is determined that the power amplifier is in an unstable operating state;
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
Optionally, in the apparatus, the determining module 62 includes:
a first determining unit, configured to determine whether the power amplifier is in a self-excited state according to the feedback signal and the input power;
the first control module 63 includes:
a first control unit for supplying power to the power amplifier in an average power tracking supply mode when the power amplifier is in a self-excited state.
Optionally, in the apparatus, the determining module 62 includes:
the second determining unit is used for determining whether the peak output power of the power amplifier exceeds a preset output power range according to the feedback signal;
and the second control unit is used for supplying power to the power amplifier according to the average power tracking power supply mode and/or reducing the input power of the power amplifier when the peak output power of the power amplifier exceeds the preset output power range.
Optionally, in the apparatus, the first control module 63 further includes:
a third control unit, configured to power the power amplifier in the average power tracking power supply mode and reduce the input power of the power amplifier when the power amplifier is in the self-excited state.
Optionally, in the apparatus, the first determining unit includes:
the first determining subunit is used for determining the actual feedback power of the coupler according to the feedback signal;
the calculating subunit is used for calculating theoretical feedback power of the coupler according to the input power;
the second determining subunit is used for determining that the power amplifier is in a self-excited state under the condition that a first difference value between the actual feedback power and the theoretical feedback power is greater than or equal to a preset power threshold value;
a third determining subunit, configured to determine that the amplifier is not in a self-excited state if the first difference is smaller than the preset power threshold.
Optionally, the apparatus further comprises:
the second obtaining module is used for obtaining the actual working frequency band of the power amplifier after controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state;
and the second control module is used for supplying power to the power amplifier according to an envelope tracking power supply mode under the condition that the actual working frequency band is changed.
Optionally, in the apparatus, the electronic device further includes a battery, a power module, and a capacitor unit, the battery supplies power to the power amplifier through the power module, one end of the capacitor unit is electrically connected between the power module and the power amplifier, and the other end of the capacitor unit is grounded through a switch;
the first control module 63 is specifically configured to control the power supply module to provide voltage to the power amplifier through an average power tracking technique, and control the switch unit to be turned on, so that the capacitor unit is grounded;
the second control module is specifically configured to control the power supply module to provide a voltage to the power amplifier through an envelope tracking technique, and control the switch unit to be turned off, so as to open the capacitor unit.
The power amplifier protection device 60 in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
The power amplifier protection device 60 in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, and embodiments of the present application are not limited specifically.
The power amplifier protection device 60 provided in the embodiment of the present application can implement each process implemented by the above-mentioned power amplifier protection method embodiment, and is not described here again to avoid repetition.
In the embodiment of the application, whether the power amplifier is in an unstable working state is judged in real time through the feedback signal of the coupler and the input power of the power amplifier, and when the power amplifier is determined to be in the unstable working state, the power amplifier is supplied with power according to an average power tracking power supply mode, and/or the input power of the power amplifier is reduced, so that the power amplifier is free from the unstable working state, and the power amplifier is prevented from being damaged due to overload work. Therefore, the method solves the problem that the prior art cannot effectively prevent the power amplifier from being damaged due to overload work of the power amplifier caused by the change of the working environment in the ET power supply mode.
Optionally, an electronic device is further provided in an embodiment of the present application, and includes the power amplifier protection circuit, a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, where the program or the instruction is executed by the processor to implement each process of the power amplifier protection method embodiment, and can achieve the same technical effect, and no further description is provided here to avoid repetition.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.
Fig. 7 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 700 includes, but is not limited to: a radio frequency unit 7001, a network module 7002, an audio output unit 7003, an input unit 7004, a sensor 7005, a display unit 7006, a user input unit 7007, an interface unit 7008, a memory 7009, a processor 7010, and the like.
Those skilled in the art will appreciate that the electronic device 70 may further comprise a power source (e.g., a battery) for supplying power to various components, and the power source may be logically connected to the processor 7010 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system. The electronic device structure shown in fig. 7 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is omitted here.
The rf unit 7001 includes, in this embodiment, an rf transceiver, a power amplifier, and a coupler; a network module 7002 including an antenna in the present embodiment;
a processor 7010, configured to obtain a feedback signal of the coupler and an input power of the power amplifier when the power amplifier is powered in an envelope tracking power supply mode; determining the working state of the power amplifier according to the feedback signal and the input power; controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state; wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
According to the electronic device provided by the embodiment of the application, whether the power amplifier is in an unstable working state is judged through the feedback signal of the coupler and the input power of the power amplifier in real time, and when the power amplifier is determined to be in the unstable working state, the power amplifier is supplied with power according to an average power tracking power supply mode, and/or the input power of the power amplifier is reduced, so that the power amplifier is free from the unstable working state, and the power amplifier is prevented from being damaged due to overload work. Therefore, the method solves the problem that the prior art cannot effectively prevent the power amplifier from being damaged due to overload work of the power amplifier caused by the change of the working environment in the ET power supply mode.
Optionally, the processor 7010 is specifically configured to determine whether the power amplifier is in a self-excited state according to the feedback signal and the input power; and when the power amplifier is in a self-excited state, supplying power to the power amplifier in an average power tracking power supply mode.
Optionally, the processor 7010 is specifically configured to determine whether a peak output power of the power amplifier exceeds a preset output power range according to the feedback signal and the input power; and when the peak output power of the power amplifier exceeds the preset output power range, supplying power to the power amplifier according to the average power tracking power supply mode, and/or reducing the input power of the power amplifier.
Optionally, the processor 7010 is further configured to power the power amplifier in the average power tracking power supply mode and reduce the input power of the power amplifier when the power amplifier is in the self-excited state.
Optionally, the processor 7010 is specifically configured to determine an actual feedback power of the coupler according to the feedback signal; calculating theoretical feedback power of the coupler according to the input power; determining that the power amplifier is in a self-excited state under the condition that a first difference value between the actual feedback power and the theoretical feedback power is greater than or equal to a preset power threshold value; determining that the amplifier is not in a free-running state if the first difference is less than the preset power threshold.
Optionally, the processor 7010 is further configured to, when it is determined that the power amplifier is in an unstable operating state, control the power amplifier to enter a protection mode, and then obtain an actual operating frequency band of the power amplifier; and under the condition that the actual working frequency band is changed, supplying power to the power amplifier according to an envelope tracking power supply mode.
Optionally, the electronic device further includes a battery, a power module, and a capacitor unit, where the battery supplies power to the power amplifier through the power module, one end of the capacitor unit is electrically connected between the power module and the power amplifier, and the other end of the capacitor unit is grounded through a switch;
the processor 7010 is specifically configured to control the power supply module to provide a voltage to the power amplifier through an average power tracking technique, and control the switch unit to be turned on, so that the capacitor unit is grounded; and the power supply module is used for controlling the power supply module to supply voltage to the power amplifier through an envelope tracking technology and controlling the switch unit to be switched off so as to switch off the capacitor unit
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the above-mentioned power amplifier protection method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the embodiment of the power amplifier protection method, and can achieve the same technical effect, and the details are not repeated here to avoid repetition.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A power amplifier protection circuit is characterized by comprising a radio frequency transceiver, a power amplifier, a coupler, an antenna, a power supply module and a protection module;
the input end of the power amplifier is electrically connected with the radio frequency transceiver;
three terminals of the coupler are respectively and electrically connected with the output end of the power amplifier, the antenna and the radio frequency transceiver;
the power supply module is electrically connected with the power amplifier;
the protection module is electrically connected between the power supply module and the power amplifier;
the control end of the protection module and the control end of the power supply module are electrically connected with the radio frequency transceiver;
when the power supply module is switched from the power supply to the power amplifier in the envelope tracking power supply mode to the power supply to the power amplifier in the average power tracking power supply mode, the radio frequency transceiver controls the protection module to provide protection for the power amplifier according to the feedback signal of the coupler.
2. The circuit of claim 1, wherein the protection module comprises a capacitor unit, one end of the capacitor unit is electrically connected between the power supply module and the power amplifier, and the other end of the capacitor unit is grounded;
the protection module is specifically configured to switch the capacitance unit from a first capacitance value to a second capacitance value when the power supply module switches from supplying power to the power amplifier in an envelope tracking power supply mode to supplying power to the power amplifier in an average power tracking power supply mode, where the second capacitance value is greater than the first capacitance value.
3. The circuit of claim 2, wherein the protection module further comprises a switch unit, and the other end of the capacitor unit is grounded through the switch unit, and the switch unit is configured to be turned off when the power supply module supplies power to the power amplifier in the envelope tracking power supply mode and to be turned on when the power amplifier is supplied in the average power tracking power supply mode.
4. A power amplifier protection method applied to an electronic device including the power amplifier protection circuit according to any one of claims 1 to 3, the method comprising:
under the condition that the power amplifier is supplied with power according to an envelope tracking power supply mode, acquiring a feedback signal of the coupler and input power of the power amplifier;
determining the working state of the power amplifier according to the feedback signal and the input power;
controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state;
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
5. The method of claim 4, wherein determining the operating state of the power amplifier based on the feedback signal comprises:
determining whether the power amplifier is in a self-excited state according to the feedback signal and the input power;
controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state, wherein the method comprises the following steps:
and when the power amplifier is in a self-excited state, supplying power to the power amplifier in an average power tracking power supply mode.
6. The method of claim 4, wherein determining the operating state of the power amplifier based on the feedback signal comprises:
determining whether the peak output power of the power amplifier exceeds a preset output power range or not according to the feedback signal;
controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state, wherein the method comprises the following steps:
and when the peak output power of the power amplifier exceeds the preset output power range, supplying power to the power amplifier according to the average power tracking power supply mode, and/or reducing the input power of the power amplifier.
7. The method of claim 5, wherein controlling the power amplifier into a protection mode upon determining that the power amplifier is in an unstable operating state further comprises:
and when the power amplifier is in the self-excited state, the power amplifier is powered in the average power tracking power supply mode, and the input power of the power amplifier is reduced.
8. The method of claim 5, wherein determining whether the power amplifier is in a free-running state based on the feedback signal and the input power comprises:
determining the actual feedback power of the coupler according to the feedback signal;
calculating theoretical feedback power of the coupler according to the input power;
determining that the power amplifier is in a self-excited state under the condition that a first difference value between the actual feedback power and the theoretical feedback power is greater than or equal to a preset power threshold value;
determining that the amplifier is not in a free-running state if the first difference is less than the preset power threshold.
9. The method of claim 5, wherein after controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable operating state, the method further comprises:
acquiring an actual working frequency band of the power amplifier;
and under the condition that the actual working frequency band is changed, supplying power to the power amplifier according to an envelope tracking power supply mode.
10. A power amplifier protection device, applied to an electronic device, wherein the electronic device comprises the power amplifier protection circuit of any one of claims 1 to 3;
the device comprises:
the first obtaining module is used for obtaining a feedback signal of the coupler and the input power of the power amplifier under the condition that the power amplifier is supplied with power according to an envelope tracking power supply mode;
the determining module is used for determining the working state of the power amplifier according to the feedback signal and the input power;
the first control module is used for controlling the power amplifier to enter a protection mode when the power amplifier is determined to be in an unstable working state;
wherein the protection mode comprises powering the power amplifier in an average power tracking power supply mode and/or reducing an input power of the power amplifier.
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| CN202111126315.7A CN113809997A (en) | 2021-09-24 | 2021-09-24 | Power amplifier protection circuit, method and device and electronic equipment |
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| CN202111126315.7A CN113809997A (en) | 2021-09-24 | 2021-09-24 | Power amplifier protection circuit, method and device and electronic equipment |
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