CN113809997B - 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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- CN113809997B CN113809997B CN202111126315.7A CN202111126315A CN113809997B CN 113809997 B CN113809997 B CN 113809997B CN 202111126315 A CN202111126315 A CN 202111126315A CN 113809997 B CN113809997 B CN 113809997B
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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
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Abstract
The application discloses a power amplifier protection circuit, a power amplifier protection method, a power amplifier protection 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 module and a protection module; the input end of the power amplifier is electrically connected with the radio frequency transceiver; the 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 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 according to the envelope tracking power supply mode 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 power amplifier protection method, a power amplifier protection device and electronic equipment.
Background
With the advent of the 5G era, communication frequencies are becoming higher, and higher power requirements are being put forward on Power Amplifiers (PA) in electronic devices that boost radio frequency power.
Currently, there are severe limitations on the input power, output power and operating supply voltage of the PA, and exceeding the limiting values may cause the PA to operate in an unstable state, which may easily cause the PA to burn out.
However, under the power supply scheme of the envelope tracking technology (Envelop Tracking, ET), the conditions of external environment changes such as improvement of output power, change of antenna environment and the like can easily cause the PA to work in an unstable state, so that the PA forms positive feedback to generate low-frequency self-excited signals or power reflection, and further the PA causes the output voltage of the PA to exceed an bearable range and burn out.
The prior art does not have a good countermeasure to the above problems.
Disclosure of Invention
The embodiment of the application aims to provide a power amplifier protection method, which can solve the problem that overload work of a power amplifier caused by change of working environment cannot be effectively prevented and the power amplifier is damaged in the ET power supply mode in the prior art.
In order to solve the technical problems, the application is realized as follows:
In a first aspect, an embodiment of the present application provides a power amplifier protection circuit, where the power amplifier protection circuit 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;
The 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 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 in an envelope tracking power supply mode, and is switched to supply power to the power amplifier in an 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.
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 powered according to an envelope tracking power supply mode, a feedback signal of the 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;
when the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode;
Wherein the protection mode includes powering the power amplifier in an average power tracking power 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, where the electronic device includes the power amplifier protection circuit of the first aspect;
the device comprises:
the first acquisition module is used for acquiring a feedback signal of the coupler and the input power of the power amplifier under the condition that the power amplifier is powered 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 includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier.
In a fourth aspect, an embodiment of the present application provides an electronic device, including the power amplifier protection circuit of the first aspect, and further including a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions implementing the steps of the method according to the second aspect when executed by the processor.
In a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which when executed by a processor perform the steps of the method according to the second aspect.
In a fifth aspect, an embodiment of 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 where the processor is configured to execute a program or instructions to implement a 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 module and a protection module; the input end of the power amplifier is electrically connected with the radio frequency transceiver; the 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 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 in an envelope tracking power supply mode, and is switched to supply power to the power amplifier in 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 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 in an envelope tracking power supply mode and is switched to the power amplifier in an average power tracking power supply mode, the radio frequency transceiver controls the protection module to provide protection for the power amplifier through the feedback signal of the coupler in real time, so that the damage of the power amplifier due to overload work is avoided. Therefore, the problem that the power amplifier is damaged due to overload work of the power amplifier caused by change of working environment in the prior art can not be effectively prevented in the ET power supply mode is solved.
Drawings
Fig. 1 is a schematic diagram of a power amplifier protection circuit in an embodiment of the application;
fig. 2 is a flowchart illustrating steps of a method for protecting a power amplifier according to an embodiment of the present application;
FIG. 3 is a schematic diagram showing the comparison of the free-running signal with the normal signal in an embodiment of the present application;
FIG. 4 is a schematic diagram of control logic of an electronic device in accordance with an embodiment of the present application;
FIG. 5 is a schematic diagram of another control logic of an electronic device in an embodiment of the application;
FIG. 6 is a schematic structural diagram of a control device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims, 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 may be interchanged where appropriate such that embodiments of the application may be practiced otherwise than as specifically illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The display control method provided by the embodiment of the application is described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a power amplifier protection circuit according to an embodiment of the application.
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 end of the power amplifier 12 is electrically connected with the radio frequency transceiver 11, so that the power amplifier 12 can receive the output signal of the radio frequency transceiver 11;
the three terminals of the coupler 13 are respectively and electrically connected with the output end of the power amplifier 12, the antenna 14 and the radio frequency transceiver 11, so that the power amplifier 12 can receive radio frequency signals sent by the radio frequency transceiver 11, amplify the radio frequency signals and enter the coupler 13, then the coupler 13 is used for coupling and then distributing the radio frequency signals to the antenna 14 for broadcasting, and the feedback signals are sent to the radio frequency transceiver 11;
The power 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 supply module 15 are electrically connected with the radio frequency transceiver 11, so that the protection module 16 and the power supply module 15 can both receive control signals of the radio frequency transceiver 11 and execute corresponding control instructions;
wherein, when the power module 15 is switched from the power supply mode of envelope tracking to the power amplifier 12, 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 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 according to the envelope tracking power supply mode and/or the average power tracking power supply mode; and because the control end of the protection module 16 and the control end of the power module 15 are electrically connected with the radio frequency transceiver 11, the radio frequency transceiver 11 can control the power module 15 to supply power to the power amplifier 12 in an envelope tracking power supply mode and/or an average power tracking power supply mode according to the communication frequency requirement.
Specifically, the coupler 13 is electrically connected to the rf transceiver 11 via the feedback signal circuit FBRX, and the power module 15 is electrically connected to the control port mipi_1 on the rf transceiver 11, so that the power module 15 can be controlled to supply power to the power amplifier in the envelope tracking power supply mode or the average power tracking power supply mode through the control port mipi_1.
Because the envelope tracking power supply mode is to control the power amplifier 12 to always work in a saturated state, the output power is controlled by adjusting the power supply voltage of the power amplifier 12, and the power supply capacitance of the power amplifier is small, so that a self-excitation signal is easy to generate under the unstable condition of external factors, and the power amplifier 12 is forced to work in an overload mode; 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 12 through an algorithm, and the power supply capacitor provided for the power amplifier 12 is required to be large, and the large capacitor is favorable for the stability of the power amplifier 12, so that the self-excitation phenomenon is not easy to occur.
Therefore, when the control power module 15 supplies power to the power amplifier 12 according to the envelope tracking power supply mode, if the radio frequency transceiver 11 determines that the power amplifier 12 is in an unstable state such as self-excitation phenomenon through the feedback signal of the coupler 13, the control power module 15 can be controlled to supply power to the power amplifier 12 according to the average power tracking power supply mode, and the protection module 16 is controlled to provide a larger power supply capacitance to the power amplifier 12, so as to meet the capacitance requirement of supplying power to the power amplifier 12 according to the average power tracking power supply mode. Because the power supply voltage of the average power tracking power supply mode is lower than that of the envelope tracking power 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 out, and protection of the power amplifier 12 is achieved, so that protection of the power amplifier is achieved.
Optionally, the protection module 16 includes a capacitor unit C1, one end of the capacitor unit C1 is electrically connected between the power module 15 and the power amplifier 12, and the other end of the capacitor unit C1 is grounded, so that the capacitor unit C1 has a large capacitance characteristic;
The protection module 16 is specifically configured to switch the capacitance unit C1 from a first capacitance value to a second capacitance value, where the second capacitance value is greater than the first capacitance value, when the power supply module 15 is switched from supplying power to the power amplifier 12 in the envelope tracking power supply mode to supplying power to the power amplifier 12 in the average power tracking power supply mode, so as to meet the 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, where the other end of the capacitor unit C1 is grounded through the switch unit M1, and the switch unit M1 is configured to disconnect the power supply to the power amplifier 12 in the envelope tracking power supply mode when the power module 15 is powered, so that the capacitor unit C1 is not grounded but becomes a small capacitor structure, so as to meet the small power supply capacitance requirement of the envelope tracking power supply mode; and closing when power is supplied to the power amplifier 12 in the average power tracking supply mode, such that the capacitive element is grounded to a large capacitive structure to meet the large supply capacitance requirements of the envelope tracking supply mode.
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 not grounded.
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 GPIO_1 is at a high level, controlling M1 to be conducted, and C1 to be grounded, namely, the power supply capacitor of the power amplifier meets the APT power supply requirement; when GPIO_1 is at a low level, M1 is controlled to be turned off, and C1 is turned off, namely the power supply capacitor of the power amplifier meets the ET power supply requirement.
Referring to fig. 2, a flowchart of 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, and the electronic device includes the power amplifier protection circuit, and the method may include steps 100 to 300.
In the embodiment of the application, the method is applied to electronic equipment, which comprises the power amplifier protection circuit, and the electronic equipment can be mobile electronic equipment such as a mobile phone, a tablet personal computer, a notebook computer, a palm computer, a vehicle-mounted electronic equipment, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), or non-mobile electronic equipment such as a personal computer (personal computer, PC), a Television (TV), a teller machine or a self-service machine.
Step 100, obtaining a feedback signal of the coupler and input power of the power amplifier under the condition that the power amplifier is powered according to an envelope tracking power supply mode.
In the step 100, the feedback signal is a signal received by the coupler when the coupler leads the signal output end of the power amplifier to the input end of the power amplifier in a coupling manner, and since the output end of the power amplifier is connected with 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 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 amplification operation of the power amplifier by the voltage of the ET power supply mode, the feedback signal of the coupler and the input power of the power amplifier are monitored in real time.
Step 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 without changing the Gain of the power amplifier, the power level of the output signal, i.e. the output power level, is monitored and controlled by the feedback signal, i.e.: pout=pin+gain, so that it is possible to determine what kind of operating state the power amplifier is in, i.e. whether the power amplifier is in or about to enter into an overload operating state, based on the feedback signal and the input power.
Step 300, when the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode;
Wherein the protection mode includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier.
In the step 300, since the envelope tracking power supply mode is to control the power amplifier to always operate in a saturated state, the output power is controlled by adjusting the power supply voltage of the power amplifier, and the power supply capacitance of the power amplifier is small, so that a self-excited signal is easily generated under the unstable condition of external factors, and the overload of the power amplifier is forced to operate; 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 the power supply capacitor of the power amplifier is required to be large, and the large capacitor is favorable for stabilizing the power amplifier, so that the self-excitation phenomenon is not easy to occur.
When the power amplifier is determined to be in an unstable working state, the power amplifier is switched from the power supply of the power amplifier according to the envelope tracking power supply mode to the power supply of the power amplifier 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, the lower supply voltage helping to protect the power amplifier from being burned out.
In addition, when the power amplifier is in an unstable working state, the most visual expression is that the output power of the power amplifier exceeds the bearable range of the power amplifier, and the output signal of the power amplifier is changed along with the change of the input signal, so that the output power of the power amplifier is reduced in a mode of reducing the input power of the power amplifier, the power amplifier is restored to the stable working state, and the purpose of protecting the power amplifier is achieved.
In the power amplifier protection method provided by the embodiment of the application, in the working process of the power amplifier, under the condition that the power amplifier is powered 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; when the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode; wherein the protection mode includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier. In the mode, whether the power amplifier is in an unstable working state or not 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 damage of the power amplifier due to overload work is avoided. Therefore, the problem that the power amplifier is damaged due to overload work of the power amplifier caused by change of working environment in the prior art can not be effectively prevented in the ET power supply mode is solved.
In the embodiment of the application, the output end of the power amplifier is connected with the coupler, the Coupling coefficient (Cf) of the coupler is a fixed parameter, and the feedback signal strength=pin+gain-Cf can be seen that the feedback signal strength is changed due to the change of Pin under the condition that the Gain and Cf are unchanged. In practical applications, the feedback signal is an FBRX signal, and thus the coupler output signal is an FBRX signal.
Optionally, in an embodiment of the present invention, the step 200 includes step 201, and the step 300 includes step 301.
Step 201, determining whether the power amplifier is in a self-excited state according to the feedback signal and the input power.
Step 201, determining the working state of the power amplifier by determining whether the power amplifier is in a 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 an unstable operation state.
The self-excitation state can be judged by detecting the self-excitation signal of the power amplifier, and when the self-excitation signal is detected, the power amplifier is judged to be in the self-excitation state; referring to fig. 3, a schematic diagram showing the output power of the power amplifier as a comparison of the free-running signal and the normal signal according to the embodiment of the application is shown. As shown in fig. 3, when the self-excitation phenomenon occurs in the power amplifier, the output power thereof is gradually amplified due to the formation of positive feedback, thereby forming a self-excitation signal Pout.
Step 301, when the power amplifier is in a self-excited state, power is supplied to the power amplifier according to an average power tracking power supply mode.
In step 301, when the self-excited signal occurs in the power amplifier, the power supply of the power amplifier is switched 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 restore the power amplifier to a stable working state, thereby achieving the purpose of protecting the power amplifier.
Optionally, in an embodiment of the method for protecting a power amplifier according to 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 an operating state of the power amplifier by determining whether the peak output power of the power amplifier exceeds a preset output power range; specifically, in the case where it is determined that the peak output power of the power amplifier exceeds the preset output power range, it is determined that the power amplifier is in an unstable operation state.
The preset output power range is an output power range which can be born by the power amplifier.
Step 302, when the peak output power of the power amplifier exceeds a preset output power range, powering the power amplifier according to the average power tracking power supply mode, and/or reducing the input power of the power amplifier.
In the above step 302, since the output signal of the power amplifier is changed according to the change of the input signal, and the Peak-to-Average Power Ratio (PAPR) of the signals in different modulation modes is considered to be not necessarily the same under the same power, the Peak-to-average power ratio of the signals in 5g n1 frequency band CP-OFDM modulation mode is about 3dB higher than that of the signals in LTE B1 frequency band SC-FDMA modulation mode, that is, the higher the Peak-to-average power ratio of the signals can be, therefore, the Peak output power of the power amplifier can be monitored to determine whether the power amplifier is overloaded or not more accurately, 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 can be reduced by reducing the input power of the power amplifier, so that the output power of the power amplifier can be reduced correspondingly, and the power amplifier can be restored to a stable working state, thereby achieving the purpose of protecting the power amplifier.
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 value of the preset output power range, and then reducing the input power of the power amplifier according to the second difference; that is, how much the peak output power of the power amplifier is in the preset output power range, how much the input power is reduced is controlled, so that the power amplifier is restored to a stable working state.
In step 302, considering that the output power of the power amplifier is out of the tolerable range of the power amplifier, the self-excitation phenomenon is likely to occur, so that the power supply of the power amplifier in the envelope tracking power supply mode can be switched to the power supply of the power amplifier in the average power tracking power supply mode, the self-excitation factor is eliminated, and the power amplifier can be restored to the 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 acceptable range of the power amplifier, the power amplifier is switched from the power supply according to the envelope tracking power supply mode to the power supply according 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 an unstable operating state.
Optionally, in a specific embodiment, the step 300 further includes step 303:
and when the power amplifier is in the self-excitation state, supplying power to the power amplifier according to the average power tracking power supply mode, and reducing the input power of the power amplifier.
In step 303, namely when the self-excitation phenomenon occurs in the power amplifier, the power supply of the power amplifier is switched 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 factor is eliminated, and meanwhile, the input power of the power amplifier is reduced, the power amplifier can be controlled to get rid of the self-excitation state more rapidly, and the power amplifier is controlled to get rid of the unstable working state rapidly, so that the power amplifier is restored to the stable working state, and the purpose of protecting the power amplifier is achieved.
In the above embodiment, for the unstable working state caused by self-excitation and the output power exceeding the preset output power range, the working load of the power amplifier can be reduced by controlling the switching from the power supply of the power amplifier in the envelope tracking power supply mode to the power supply of the power amplifier in the average power tracking power supply mode and/or reducing the input power of the power amplifier, thereby relieving the unstable working degree of the power amplifier and achieving the purpose of protecting the power amplifier.
Optionally, in a specific embodiment, in step 201, the step of determining whether the power amplifier is in the self-excited state according to the feedback signal and the input power includes steps 2011 to 2014.
And step 2011, determining the actual feedback power of the coupler according to the feedback signal.
In the step 2011, the power of the output signal of the coupler, that is, the actual feedback power, is calculated and determined according to the actually 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=pin+gain-Cf of the coupler, the Gain factor Gain and the coupling factor Cf are all fixed parameters, and the feedback signal theoretically varies with Pin in a specific relationship, the theoretical power of the feedback signal of the coupler, that is, the theoretical feedback power of the coupler, can be calculated by combining the input power of the power amplifier with the Gain factor Gain and the coupling factor Cf.
And step 2013, determining that the power amplifier is in a self-excited state when the first difference value between the actual feedback power and the theoretical feedback power is greater than or equal to a preset power threshold value.
In the step 2013, the preset power threshold is a coupler feedback signal strength deviation threshold for determining whether the power amplifier has self-excitation, and when a first difference between the actual feedback power and the theoretical feedback power of the coupler feedback signal is greater than or equal to the preset power threshold, it is indicated that the feedback signal strength deviation from the theoretical value is greater, so that the power amplifier is determined to be in the self-excitation state.
Step 2014, determining that the amplifier is not in a self-excited state when the first difference value is smaller than the preset power threshold value.
In step 2014, when 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 is determined that the feedback signal strength deviates from the theoretical value by a small amount, and thus it is determined that the power amplifier is not in the self-excited state.
Setting the power of the PA input signal Pin to be 1dBm, enabling the PA Gain to be=25 dBm, and enabling the coupling coefficient Cf to be=23 dBm; the theoretical feedback power, e.g., fbrx=pin+gain-cf=1+25-23=3 dBm
If the preset power threshold value x=2dbm is set, the fbrx_actual measurement value, that is, the actual feedback power, is:
1) When the measured value of FBRX_is larger than or equal to the expected value of FBRX_ +X=3+2=5 dBm, judging that the power supply is self-excited, closing the ET power supply mode, and switching to the APT power supply mode;
2) When the measured value of FBRX_is smaller than the expected value of FBRX_ +X=3+2=5 dBm, judging that the self-excitation is not carried out, and keeping the ET power supply mode
In the above embodiment, the output power of the power amplifier is checked by using the feedback signal of the coupler to determine whether the self-excitation phenomenon occurs, and then when the self-excitation phenomenon occurs, the power amplifier is controlled to enter the protection mode, so as to realize the protection of the power amplifier.
Optionally, in an implementation manner, the power amplifier protection method provided by the embodiment of the present application further includes steps 400 to 500 after the step 300.
Step 400, obtaining an actual working frequency band of the power amplifier.
In the above step 400, because the frequency bands of the power amplifier actually operated 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 states any more, and therefore the actual operating frequency band of the power amplifier needs to be obtained in real time, and the actual operating frequency band of the power amplifier can be determined by the electronic device by detecting the actual operating frequency band of the antenna.
And 500, 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.
In the above step 500, because the power of the output signal of the power amplifier is different when the power amplifier operates in different operating frequency bands, the corresponding operating state of the power amplifier is also different, so that the factor causing the power amplifier to enter the unstable operating state is likely to have been changed when the actual power frequency band is transmitted and changed, such as the frequency band cell is switched, so that the protection mode can be exited first, that is, the power amplifier is continuously supplied in the envelope tracking power supply mode, and the input power of the power amplifier is reduced when the peak output power of the power amplifier exceeds the preset output power range, so that the electric energy is saved as much as possible under the premise of protecting the power amplifier.
Optionally, in a specific embodiment, the power amplifier is powered according to the average power tracking power supply mode, including step 304; the power amplifier is powered in the envelope tracking power mode described above, including step 501.
In this embodiment, the battery supplies power to the power amplifier via the power module, and the power module has two power supply modes, that is, an average power tracking power supply mode and an envelope tracking power supply mode, so that the power module can be controlled to supply power to the power amplifier in the average power tracking power supply mode or supply power to the power amplifier in the envelope tracking power supply mode.
Step 304, controlling the power module to provide voltage to the power amplifier through an average power tracking technology, and controlling the switch unit to be turned on 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 capacitance of the power amplifier and the envelope tracking power supply mode requires a smaller power bypass capacitance of the power amplifier, for the average power tracking power supply mode, the power bypass capacitance of the power amplifier is different, one end of the capacitor unit is electrically connected between the power module and the power amplifier, the other end of the capacitor unit is grounded through the switch unit, and when the power amplifier is required to be supplied in the average power tracking power supply mode, the power module is controlled to supply 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 capacitance, meeting the power bypass capacitance requirement of the power amplifier in the average power tracking power supply mode, and further supplying the power amplifier in the average power tracking power supply mode. The capacitance value of the capacitor unit satisfies the capacitance requirement of the average power tracking power supply mode, for example, 1uF, under the condition of grounding.
Step 501, controlling the power module to provide voltage to the power amplifier through an envelope tracking technology, and controlling the switch unit to be opened so as to disconnect the capacitor unit.
In the step 501, since one end of the capacitor unit is electrically connected between the power module and the power amplifier, the other end of the capacitor unit is grounded through a 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, and the capacitor unit is turned into a small capacitor, thereby meeting the power bypass capacitor requirement of the power amplifier in the envelope tracking power supply mode, and further, the power amplifier can be powered according to the envelope tracking power supply mode.
Optionally, the switch is a 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 tube switch needs to be controlled to be conducted, a first level signal is sent to the MOS tube switch, and the MOS tube switch is controlled to be conducted, so that the capacitor unit is grounded; when the MOS tube switch needs to be controlled to be disconnected, a second level signal is sent to the MOS tube switch, and the MOS tube switch is controlled to be disconnected, so that the capacitor unit is disconnected. 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 switch is controlled to control the capacitor unit to be grounded or disconnected, so that the capacitor unit is controlled to switch between a larger capacitor meeting the average power tracking power supply mode and a smaller capacitor meeting the envelope tracking power supply mode, thereby conveniently realizing 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.
Referring to fig. 4, a control logic diagram of an electronic device according to an embodiment of the application is shown.
As shown in fig. 4, in step 401, when the power amplifier starts to operate, 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, determining 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 when determining that the power amplifier is in the self-excited state, proceeding to step 403;
In step 403, the MOS transistor is controlled to be turned on, and the power supply is controlled to provide an average power tracking technology supply voltage, so as to supply power to the power amplifier according to an 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, another control logic diagram of an electronic device according to an embodiment of the application is shown.
As shown in fig. 5, in step 501, when the power amplifier starts to operate, 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, the peak output power of the power amplifier is detected by PBRX circuitry;
In step 503, comparing the output peak power of the power amplifier with a preset output power range, determining whether the output peak power of the power amplifier exceeds the preset output power range, if yes, 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 enable the output peak power of the power amplifier to meet the specified requirement;
In step 505, the MOS transistor is controlled to be turned on, and the power supply is controlled to provide an average power tracking technology supply voltage, so as to supply power to the power amplifier according to an 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 re-entered, otherwise the state of step 502 is maintained.
It should be noted that, in the power amplifier protection method provided by the embodiment of the present application, the execution body may be an electronic device, or a power amplifier protection module in the electronic device for executing the loading power amplifier protection method. In the embodiment of the application, the method for protecting the power amplifier provided by the embodiment of the application is described by taking the method for controlling the loading of the electronic equipment as an example.
Referring to fig. 6, a schematic structural diagram of a power amplifier protection device provided by an embodiment of the present application is shown, and as shown in fig. 6, a power amplifier protection device 60 provided by 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 according to 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 includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier.
Optionally, in the apparatus, the determining module 62 includes:
the first determining unit is used for determining 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:
And the first control unit is used for supplying power to the power amplifier according to an average power tracking power 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:
and the third control unit is used for supplying power to the power amplifier according to the average power tracking power supply mode when the power amplifier is in the self-excitation state, and reducing the input power of the power amplifier.
Optionally, in the apparatus, the first determining unit includes:
a first determining subunit, configured to determine an actual feedback power of the coupler according to the feedback signal;
a calculating subunit, configured to calculate a theoretical feedback power of the coupler according to the input power;
A second determining subunit, configured to determine that the power amplifier is in a self-excited state when a first difference between the actual feedback power and the theoretical feedback power is greater than or equal to a preset power threshold;
and the third determining subunit is used for determining that the amplifier is not in a self-excited state under the condition that the first difference value is smaller than the preset power threshold value.
Optionally, the apparatus further comprises:
The second acquisition module is used for acquiring 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, where the battery supplies power to the power amplifier via 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 a voltage to the power amplifier through an average power tracking technology, and control the switch unit to be turned on so as to ground the capacitor unit;
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 technology, and control the switch unit to be turned off, so that the capacitor unit is turned off.
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 may be a mobile electronic device or a non-mobile electronic device. By way of example, the mobile electronic device may be 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), etc., and the non-mobile electronic device may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a Television (TV), a teller machine, a self-service machine, etc., and the embodiments of the present application are not limited in particular.
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 operating system, an ios operating system, or other possible operating systems, and the embodiment of the present application is 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 power amplifier protection method embodiment, and in order to avoid repetition, a description is omitted here.
In 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 is supplied to the power amplifier according to the 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 working state, and the damage of the power amplifier due to overload work is avoided. Therefore, the problem that the power amplifier is damaged due to overload work of the power amplifier caused by change of working environment in the prior art can not be effectively prevented in the ET power supply mode is solved.
Optionally, the embodiment of the present application further provides an electronic device, including the above power amplifier protection circuit, and further includes a processor, a memory, and a program or an instruction stored in the memory and capable of running on the processor, where the program or the instruction is executed by the processor to implement each process of the above power amplifier protection method embodiment, and the process can achieve the same technical effect, so that repetition is avoided, and no further description is given here.
It should be noted that, the electronic device in the embodiment of the present application includes the mobile electronic device and the non-mobile electronic device 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: radio frequency unit 7001, network module 7002, audio output unit 7003, input unit 7004, sensor 7005, display unit 7006, user input unit 7007, interface unit 7008, memory 7009, and processor 7010.
Those skilled in the art will appreciate that the electronic device 70 may also include a power source (e.g., a battery) for powering the various components, which may be logically connected to the processor 7010 via a power management system to perform functions such as managing charge, discharge, and power consumption 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 shown, or may combine certain components, or may be arranged in different components, which are not described in detail herein.
The radio frequency unit 7001 in the embodiment of the application comprises a radio frequency transceiver, a power amplifier and a coupler; network module 7002, which in an embodiment of the application includes an antenna;
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; when the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode; wherein the protection mode includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier.
According to the electronic equipment 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 is supplied to the power amplifier according to the 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 damage of the power amplifier due to overload work is avoided. Therefore, the problem that the power amplifier is damaged due to overload work of the power amplifier caused by change of working environment in the prior art can not be effectively prevented in the ET power supply mode is solved.
Optionally, the processor 7010 is specifically configured to determine, according to the feedback signal and the input power, whether the power amplifier is in a self-excited state; and when the power amplifier is in a self-excited state, the power amplifier is powered according to an average power tracking power supply mode.
Optionally, the processor 7010 is specifically configured to determine, according to the feedback signal and the input power, whether the peak output power of the power amplifier exceeds a preset output power range; 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 mode and reduce an 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; and under the condition that the first difference value is smaller than the preset power threshold value, determining that the amplifier is not in a self-excited state.
Optionally, the processor 7010 is further configured to, when determining that the power amplifier is in an unstable working state, control the power amplifier to enter a protection mode, and then acquire an actual working frequency band of the power amplifier; and under the condition that the actual working frequency band is changed, the power amplifier is powered 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 via 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 module to provide a voltage to the power amplifier through an average power tracking technology, and control the switch unit to be turned on so as to ground the capacitor unit; and the power supply module is used for providing voltage to the power amplifier through an envelope tracking technology and controlling the switch unit to be opened so as to disconnect the capacitor unit
The embodiment of the application also provides a readable storage medium, on which a program or an instruction is stored, which when executed by a processor, implements each process of the above-mentioned power amplifier protection method embodiment, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here.
Wherein the processor is a 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 (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.
The embodiment of the application further provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the processes of the power amplifier protection method embodiment, and the same technical effects can be achieved, so that repetition is avoided, and the description is omitted here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (10)
1. The power amplifier protection circuit is characterized by comprising 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;
The 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 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 of the power amplifier according to the envelope tracking power supply mode to the power supply of 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; the feedback signal is used to monitor and control the output power of the power amplifier.
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 is switched 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, wherein the second capacitance value is larger than the first capacitance value.
3. The circuit of claim 2, wherein the protection module further comprises a switching unit through which the other end of the capacitive unit is grounded, the switching unit being configured to be opened when the power supply module supplies power to the power amplifier in an envelope tracking power supply mode and to be closed when the power amplifier is supplied with power in an average power tracking power supply mode.
4. A power amplifier protection method applied to an electronic device, the 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 powered according to an envelope tracking power supply mode, a feedback signal of the 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;
when the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode;
Wherein the protection mode includes powering the power amplifier in an average power tracking power 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;
When the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode, wherein the method comprises the following steps of:
And when the power amplifier is in a self-excited state, the power amplifier is powered according to 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 according to the feedback signal;
When the power amplifier is determined to be in an unstable working state, controlling the power amplifier to enter a protection mode, wherein the method comprises the following steps of:
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 upon determining that the power amplifier is in an unstable operating state, controlling the power amplifier to enter a protected mode further comprises:
and when the power amplifier is in the self-excitation state, supplying power to the power amplifier according to the average power tracking power supply mode, and reducing the input power of the power amplifier.
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;
And under the condition that the first difference value is smaller than the preset power threshold value, determining that the amplifier is not in a self-excited state.
9. The method of claim 5, wherein upon determining that the power amplifier is in an unstable operating state, controlling the power amplifier to enter a protected mode, 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, the power amplifier is powered according to an envelope tracking power supply mode.
10. A power amplifier protection device, characterized by being applied to an electronic apparatus, the electronic apparatus comprising the power amplifier protection circuit according to any one of claims 1 to 3;
the device comprises:
the first acquisition module is used for acquiring a feedback signal of the coupler and the input power of the power amplifier under the condition that the power amplifier is powered 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 includes powering the power amplifier in an average power tracking power mode and/or reducing an input power of the power amplifier.
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| CN114915315B (en) * | 2022-06-20 | 2024-07-19 | Oppo广东移动通信有限公司 | Radio frequency system and control method thereof |
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