CN113949409B - Radio frequency circuit and electronic equipment - Google Patents
Radio frequency circuit and electronic equipment Download PDFInfo
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- CN113949409B CN113949409B CN202111124193.8A CN202111124193A CN113949409B CN 113949409 B CN113949409 B CN 113949409B CN 202111124193 A CN202111124193 A CN 202111124193A CN 113949409 B CN113949409 B CN 113949409B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses radio frequency circuit and electronic equipment belongs to communication technology field, and this radio frequency circuit includes: the device comprises a detection module, a radio frequency access module, a switch module and a power regulating circuit; the detection module detects the distance between the human body and the electronic equipment, controls the on state of the switch module according to the distance, and controls the first power adjusting branch to be connected with the coupler and the radio frequency transceiver when the switch module is in a first distance interval, and controls the second power adjusting branch to be connected with the coupler and the radio frequency transceiver when the switch module is in a second distance interval, so that the radio frequency transceiver controls the radio frequency antenna to transmit and receive signals with different powers. The power of the radio frequency signal received by the radio frequency transceiver is regulated by the power regulating circuit, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with different powers, thereby achieving the purpose of regulating the radio frequency power without CPU control.
Description
Technical Field
The application belongs to the field of communication, and particularly relates to a radio frequency circuit and electronic equipment.
Background
The electromagnetic wave absorption ratio (Specific Absorption Rate, SAR) refers to electromagnetic radiation energy absorbed by a living body in unit time (seconds) and unit mass (kg), and is used for measuring the influence of electromagnetic radiation on human health when an electronic device generates a wireless signal, and the higher the SAR value is, the more serious the influence of the electromagnetic radiation on the human body is.
In order to reduce the influence of electromagnetic radiation on a human body, the electronic equipment can detect the distance between the human body and the electronic equipment, and the radio frequency power is adjusted according to different distances so as to reduce the SAR value of a user when the electronic equipment is used.
In the prior art, a central processing unit (Central Processing Unit, CPU) is required to participate in the implementation to control the reduction of SAR values when the user uses the electronic device. When the CPU participates in the implementation of reducing the SAR value, the parameters of the CPU need to be configured correspondingly, and the operation is complex.
Disclosure of Invention
The embodiment aims to provide a radio frequency circuit and an electronic device, which can solve the problem of complex operation when a CPU participates in implementation of SAR value reduction
In a first aspect, embodiments of the present application provide a radio frequency circuit, including: the device comprises a measurement module, a radio frequency access module, a switch module and a power regulating circuit;
the radio frequency access module comprises a radio frequency transceiver, a coupler and a radio frequency antenna which are sequentially connected;
the detection module is connected with the switch module and is used for detecting the distance between a human body and the electronic equipment and controlling the conduction state of the switch module according to the distance;
the switch module is connected with the power regulating circuit, and the power regulating circuit comprises a first power regulating branch circuit and a second power regulating branch circuit;
When the distance is within a first distance interval, the switch module is in a first conduction state, one end of the first power regulation branch is controlled to be connected with the coupler, and the other end of the first power regulation branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with first power by performing power regulation on radio frequency signals output by the coupler to the radio frequency transceiver;
when the distance is within a second distance interval, the switch module is in a second conduction state, one end of the second power adjustment branch is controlled to be connected with the coupler, and the other end of the second power adjustment branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with second power by performing power adjustment on radio frequency signals output by the coupler to the radio frequency transceiver; the second power is different from the first power.
In a second aspect, embodiments of the present application provide an electronic device comprising a radio frequency circuit as described above.
In an embodiment of the present application, the radio frequency circuit may include: the device comprises a detection module, a radio frequency access module, a switch module and a power regulating circuit; the radio frequency path module comprises a radio frequency transceiver, a coupler and a radio frequency antenna which are sequentially connected. The detection module is connected with the switch module and is used for detecting the distance between the human body and the electronic equipment and controlling the conduction state of the switch module according to the distance. The switch module is connected with the power regulating circuit, and the power regulating circuit comprises a first power regulating branch circuit and a second power regulating branch circuit. Under the condition that the distance is in a first distance range, the switch module is in a first conduction state, one end of the first power adjusting branch is controlled to be connected with the coupler, the other end of the first power adjusting branch is connected with the radio frequency transceiver, so that the radio frequency signal output by the coupler to the radio frequency transceiver is subjected to power adjustment, and the radio frequency transceiver is controlled to transmit and receive signals with the first power. Under the condition that the distance is in a second distance interval, the switch module is in a second conduction state, one end of the second power regulation branch is controlled to be connected with the coupler, and the other end of the second power regulation branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with second power; the second power is different from the first power. The power of the radio frequency signal received by the radio frequency transceiver is regulated by the power regulating circuit, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with different powers, the purpose of regulating the radio frequency power is achieved, the CPU can be avoided from being used for regulating the radio frequency power, and the process of configuring CPU parameters can be avoided.
Drawings
Fig. 1 is a schematic structural diagram of a radio frequency circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another radio frequency circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another radio frequency circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another radio frequency circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another radio frequency circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 7 is a schematic hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. 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 radio frequency circuit provided in the embodiment of the application is described in detail below by means of specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a radio frequency circuit according to an embodiment of the present application, where the radio frequency circuit includes: the device comprises a detection module, a radio frequency access module, a switch module and a power regulating circuit.
The rf path module includes an rf transceiver 1021, a coupler 1022, and an rf antenna 1023, which are sequentially connected. The detection module 101 is connected with the switch module 103, and the detection module 101 is used for detecting the distance between the human body and the electronic device and controlling the conduction state of the switch module 103 according to the distance. The switching module 103 is connected to a power conditioning circuit comprising a first power conditioning branch 104 and a second power conditioning branch 105. When the distance is within the first distance range, the switch module 103 is in a first conducting state, and controls one end of the first power adjustment branch 104 to be connected with the coupler 1022 and the other end to be connected with the rf transceiver 1021, so as to perform power adjustment on the rf signal output by the coupler 1022 to the rf transceiver 1021, so that the rf transceiver 1021 controls the rf antenna 1023 to transmit and receive the signal at the first power. When the distance is within the second distance range, the switch module 103 is in a second conducting state, and controls one end of the second power adjustment branch 105 to be connected with the coupler 1022 and the other end to be connected with the rf transceiver 1021, so as to perform power adjustment on the rf signal output by the coupler 1022 to the rf transceiver 1021, so that the rf transceiver 1021 controls the rf antenna 1023 to transmit and receive signals with the second power; the second power is different from the first power.
Optionally, the radio frequency access module further comprises a radio frequency amplifier, wherein an input end of the radio frequency amplifier is connected with the radio frequency transceiver, and an output end of the radio frequency amplifier is connected with the coupler; the radio frequency transceiver is used for controlling the radio frequency amplifier to output radio frequency signals with different powers to the radio frequency antenna according to the radio frequency signals output by the first power adjusting branch or the second power adjusting branch so that the radio frequency antenna receives and transmits the signals with different powers.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another radio frequency circuit provided in the embodiment of the present application, where the radio frequency transceiver 1021, the radio frequency Amplifier 1024, the coupler 1022 and the radio frequency antenna 1023 form a radio frequency coupled Power loop (Coupling Power Loop, CPL), the radio frequency transceiver 1021 may also be referred to as a radio frequency transceiver chip, the radio frequency Amplifier 1024 may also be referred to as a Power Amplifier (PA), an output end of the radio frequency transceiver 1021 is connected to an input end of the radio frequency Amplifier 1024 for outputting an original radio frequency signal to the radio frequency Amplifier 1024, and an output end of the radio frequency Amplifier 1024 is connected to an input end of the coupler 1022 for amplifying the original radio frequency signal to obtain a target radio frequency signal and providing the target radio frequency signal to the coupler 1022. The first output end of the coupler 1022 is connected to the rf antenna 1023, and is used to transmit the target rf signal to the rf antenna 1023, so that the rf antenna 1023 outputs the target rf signal. The rf antenna 1023 transmits the target rf signal to the outside, thereby realizing transmission of the wireless signal. Meanwhile, the second output end of the coupler 1022 is connected to one end of the first power adjustment branch 104 and one end of the second power adjustment branch 105, and the target rf signal may be coupled to the rf transceiver 1021 through one of the first power adjustment branch 104 or the second power adjustment branch 105, where the coupling may also be referred to as output.
In the embodiment of the invention, when the radio frequency amplifier is arranged in the radio frequency coupling power loop, the radio frequency transceiver can realize the power control of the radio frequency antenna through the adjustment of the radio frequency signal output by the radio frequency amplifier, thereby being convenient for adjusting the power of the radio frequency antenna.
In this embodiment, the electronic device is an electronic device where a radio frequency circuit is located, for example, a mobile phone. The detection module 101 may detect a distance between a human body and the electronic device, and output different control signals to the switch module 103 according to different distances, so that the switch module 103 is in different on states. The switching module 103 may select one of the first power regulation branch 104 and the second power regulation branch 105 to connect the rf transceiver 1021 and the coupler 1022 to couple the target rf signal to the rf transceiver 1021 in different conductive states. As shown in fig. 1 and 2, the switch module 103 is disposed between the power adjustment circuit and the rf transceiver 1021, a first end of the switch module 103 is connected to the rf transceiver 1021, a second end is connected to the first power adjustment branch 104, a third end is connected to the second power adjustment branch 105, and ends of the first power adjustment branch 104 and the second power adjustment branch 105, which are far from the switch module 103, are both connected to the second output end of the coupler 1022. The first terminal and the second terminal of the switch module 103 form a first set of switches, when the switch module 103 is in the first conductive state, the first terminal is controlled to be connected to the second terminal, and the first power regulation branch 104 is connected to the radio frequency transceiver 1021 and the coupler 1022. Similarly, when the switch module 103 is in the second conducting state, the second power regulation branch 105 connects the rf transceiver 1021 and the coupler 1022 when the first terminal is controlled to be connected to the third terminal.
The detection module 101 may detect a distance between a human body and the electronic device, and output control signals representing different distance states according to different distances. For example, when the distance between the human body and the electronic device is greater than or equal to a first preset distance, that is, the distance between the human body and the electronic device is within a first distance interval, the detection module 101 may output a first control signal; when the distance between the human body and the electronic device is smaller than the first preset distance, that is, the distance between the human body and the electronic device is within the second distance range, the detection module 101 may output the second control signal. That is, the detection module 101 may sequentially output the first control signal and the second control signal according to the distance between the human body and the electronic device. The circuit structure of the detection module, and the specific type and number of the control signals may be set according to requirements, which is not limited in this embodiment.
In this embodiment, each power adjustment branch corresponds to a different distance interval, and circuit parameters of different power adjustment branches are different, so that power of a target radio frequency signal can be adjusted to different degrees, and a radio frequency transceiver can receive radio frequency signals with different powers under different distance states. For example, the first power adjustment branch corresponds to the first control signal, and the first power adjustment branch may amplify the power of the target radio frequency signal by X times; the second power regulation branch corresponds to the second control signal, and can amplify the power of the target radio frequency signal by Y times. X is less than Y, X and Y may be values greater than 0, for example X may be 0.5 and Y0.3. It should be noted that, the power adjustment branch may amplify or reduce the power of the target rf signal, so that the rf transceiver may receive rf signals with different powers in different distance states. The specific circuit structure of the power adjustment branch circuit can be set according to requirements, and the embodiment is not limited to this.
The circuit structure of the switch module can be set according to the type of the control signal, when the detection module outputs different control signals according to the distance state between the human body and the electronic equipment, the switch module is in different conducting states, and the power regulation branch circuit corresponding to the distance state can be selected from the first power regulation branch circuit and the second power regulation branch circuit according to the different control signals to be connected with the radio frequency transceiver and the coupler. Because the first power adjusting branch circuit and the second power adjusting branch circuit can respectively adjust the power of the target radio frequency signal to different degrees, when the radio frequency transceiver receives radio frequency signals with different powers, the power of the radio frequency antenna can be adjusted according to the radio frequency signals with different powers. In combination with the above example, when the distance between the human body and the electronic device is greater than or equal to the first preset distance, the detection module 101 outputs the first control signal, the switch module 103 receives the first control signal, controls the first end to be connected with the second end, the first power adjustment branch 104 connects the rf transceiver 1021 and the coupler 1022, the power of the rf signal transmitted to the rf transceiver 1021 by the first power adjustment branch 104 is 0.5 times of the target rf signal, and at this time, the rf transceiver 1021 can adjust the output power of the rf amplifier 1024 according to the target rf signal of 0.5 times, so that the rf antenna 1023 outputs the rf signal with the first power. When the distance between the human body and the electronic device is smaller than the first preset distance, the detection module 101 outputs a second control signal, the switch module 103 receives the second control signal, and controls the first end to be connected with the third end, the second power adjustment branch 105 is connected with the radio frequency transceiver 1021 and the coupler 1022, the power of the radio frequency signal transmitted to the radio frequency transceiver 1021 by the second power adjustment branch 105 is 0.3 times of the target radio frequency signal power, and at this time, the radio frequency transceiver 1021 can adjust the output power of the radio frequency amplifier 1024 according to the target radio frequency signal of 0.3 times, so that the radio frequency antenna 1023 outputs the radio frequency signal with the second power. The larger the power of the rf signal received by the rf transceiver 1021, the closer the distance between the human body and the electronic device is, the smaller the power of the original rf signal output to the rf amplifier 1024, the smaller the output power of the rf amplifier 1024 can be controlled, and the smaller the power of the corresponding rf antenna 1023, the smaller the SAR value of the electronic device. That is, the first power is greater than the second power, when the distance between the human body and the electronic device is greater than or equal to the first preset distance, the rf antenna 1023 outputs the rf signal with the greater first power, and when the distance between the human body and the electronic device is less than the first preset distance, the rf antenna 1023 outputs the rf signal with the smaller second power.
In this embodiment, the larger the power of the radio frequency signal received by the radio frequency transceiver, the lower the power of the original radio frequency signal output to the radio frequency amplifier, that is, the lower the output power of the radio frequency amplifier when the distance between the human body and the electronic device is shorter, the lower the power of the target radio frequency signal output to the radio frequency antenna by the radio frequency amplifier is, so that the power of the radio frequency antenna can be reduced, the SAR value of the electronic device is reduced, and the influence on the human body is avoided. In combination with the above example, from the first control signal to the second control signal, the distance between the user and the electronic device gradually decreases, the power of the radio frequency signal received by the radio frequency transceiver gradually increases, and the radio frequency transceiver can gradually reduce the output power of the radio frequency amplifier, so as to reduce the radio frequency power of the radio frequency signal output by the radio frequency antenna, so as to reduce the SAR value of the electronic device where the radio frequency circuit is located. The power of the target radio frequency signal output by the radio frequency amplifier to the radio frequency antenna corresponds to the distance state between the user and the electronic equipment, and the SAR value corresponding to the power of the radio frequency signal output by the radio frequency antenna needs to be made to meet the safety requirement, so that the influence on the user is avoided. In practical application, the rf amplifier may not be provided, and the rf transceiver may directly output an original rf signal to the coupler, and control the transmit-receive power of the rf antenna by adjusting the power of the original rf signal.
In the embodiment of the invention, the switch module can select different power adjusting branches to connect the radio frequency transceiver and the coupler under different distance states, so that the power of the radio frequency signal received by the radio frequency transceiver can be adjusted to different degrees, and the radio frequency transceiver can adjust the radio frequency power of the radio frequency antenna to different degrees under different distance states according to the received radio frequency signal. The switch module and the power regulation branch circuit can be composed of simple circuit elements, CPU control is not needed, control logic of the radio frequency circuit can be simplified, circuit structures of the switch module and the power regulation branch circuit are simple, and circuit structures of the radio frequency circuit can be simplified while power regulation under different distance states is achieved.
Optionally, the power regulation circuit further comprises a third power regulation branch; when the distance is within a third distance range, the switch module is in a third conduction state, one end of the third power regulation branch is controlled to be connected with the coupler, and the other end of the third power regulation branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with third power by performing power regulation on radio frequency signals output by the coupler to the radio frequency transceiver; the third power is different from the first power and the second power.
As shown in fig. 2, the power adjusting circuit includes 3 parallel power adjusting branches, a first end of the switch module 103 is connected to the radio frequency transceiver 1021, a second end is connected to the first power adjusting branch 104, a third end is connected to the second power adjusting branch 105, and a fourth end is connected to the third power adjusting branch 106. The ends of the first power regulation branch 104, the second power regulation branch 105 and the third power regulation branch 106, which are far away from the switch module 103, are all connected to the coupler 1022. The first terminal and the second terminal form a first set of switches, when the switch module 103 is in a first conductive state, the first terminal and the second terminal are controlled to be turned on, and the first power adjustment branch 201 is connected to the rf transceiver 1021 and the coupler 1022. Similarly, when the switch module 103 is in the second conductive state, the first end is controlled to be connected to the third terminal, the second power adjustment branch 105 is connected to the rf transceiver 1021 and the coupler 1022, and when the switch module 103 is in the third conductive state, the first end is controlled to be connected to the fourth terminal, and the third power adjustment branch 106 is connected to the rf transceiver 1021 and the coupler 1022. The detection module 101 may output a first control signal when a distance between the human body and the electronic device is greater than or equal to a first preset distance, the detection module 101 may output a second control signal when the distance between the human body and the electronic device is less than the first preset distance and greater than or equal to a second preset distance, and the detection module 101 may output a third control signal when the distance between the human body and the electronic device is less than the second preset distance. The first preset distance is greater than the second preset distance, that is, the detection module 101 may sequentially output the first control signal, the second control signal, and the third control signal according to the distance between the user and the electronic device. The first power adjustment branch 104 corresponds to the first control signal, the first power adjustment branch 104 may amplify the power of the target radio frequency signal by X times, the second power adjustment branch 105 corresponds to the second control signal, the power of the target radio frequency signal may be amplified by Y times, and the third power adjustment branch 106 corresponds to the third control signal, the power of the target radio frequency signal may be amplified by Z times. Where X is less than Y, Y is less than Z, X, Y and Z can be values greater than 0, for example X can be 0.5, Y0.7 and Z0.9.
In the embodiment of the invention, the power regulating circuit comprises a first power regulating branch, a second power regulating branch and a third power regulating branch, so that the switch module can respectively select different power regulating branches to be connected with the radio frequency transceiver and the coupler according to the distance between a human body and electronic equipment from far to near, and the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with different powers according to the distance from far to near.
Optionally, the detection module includes a proximity sensor and a voltage comparator; the proximity sensor is used for detecting the distance between the human body and the electronic equipment and outputting a corresponding voltage signal to the voltage comparator according to the distance; the voltage comparator is connected with the proximity sensor and is used for receiving the voltage signal, outputting a first control signal to the switch module under the condition that the voltage signal is larger than a preset threshold value so as to enable the switch module to be in a first conduction state, and outputting a second control signal to the switch module under the condition that the voltage signal is smaller than the preset threshold value so as to enable the switch module to be in a second conduction state.
As shown in fig. 3, fig. 3 is a schematic structural diagram of another radio frequency circuit provided in the embodiment of the present application, where the detection module 101 includes a proximity sensor 1011 and a voltage comparator 1012, the proximity sensor 1011 may also be referred to as a radio frequency antenna, and may be a capacitive proximity sensor, an infrared proximity sensor or an ultrasonic proximity sensor, the proximity sensor 1011 is configured to detect a distance between a human body approaching an electronic device and the electronic device, and output a transformed voltage signal to the voltage comparator 1012 according to different distances, and the closer the distance between the human body and the electronic device is, the larger the voltage signal output by the proximity sensor 1011 is. The voltage comparator 1012 may be implemented by an operational amplifier, and two input terminals of the voltage comparator 1012 are respectively provided with a first input resistor 301 and a second input resistor 302, where the first input resistor 301 is used for connecting a reference voltage (the reference voltage is denoted by a symbol V1 in fig. 3), and the second input resistor 302 is used for receiving a voltage signal output by the proximity sensor 1011. An output terminal of the voltage comparator 1012 is connected to the pull-up resistor 303, one terminal of the pull-up resistor 303 is connected to a power supply voltage (the power supply voltage is denoted by a symbol V2 in fig. 3), and an output terminal of the voltage comparator 1012 is connected to the switching module for outputting a first control signal and a second control signal to the switching module.
In this embodiment, the voltage comparator 1012 is configured to compare the reference voltage with the voltage signal output by the proximity sensor 1011, and if the voltage signal output by the proximity sensor 1011 is greater than the reference voltage, output a second control signal, for example, a voltage signal of 2 volts (V), where the second control signal corresponds to the proximity state, and indicates that the distance between the user and the electronic device is relatively close, that is, the distance between the human body and the electronic device is within the second distance interval. In contrast, if the voltage signal output by the proximity sensor is smaller than the reference voltage, a second control signal, for example, a voltage signal of 0V, is output, where the second control signal corresponds to a far-away state, and indicates that the distance between the user and the electronic device is relatively close, that is, when the distance between the human body and the electronic device is within the first distance interval. Correspondingly, the switch module is in a first conduction state when receiving the first control signal, and is connected with the radio frequency transceiver and the coupler through the first power regulation branch, and is in a second conduction state when receiving the second control signal, and is connected with the radio frequency transceiver and the coupler through the second power regulation branch.
It should be noted that, the voltage comparator in this embodiment is implemented by using a simple operational radio frequency amplifier, in practical application, a relatively complex electronic component may be used to implement the voltage comparator according to the requirement, so as to output a plurality of control signals representing different distance states, and the specific implementation of the voltage comparator may be set according to the requirement, which is not limited in this embodiment.
In the embodiment of the application, the detection module is realized by the proximity sensor and the voltage comparator, the circuit logic of the voltage comparator is simple, the design of the radio frequency circuit can be simplified, the occupied circuit area is smaller, and the increase of the volume of the radio frequency circuit can be avoided.
Optionally, the detection module further includes a voltage amplifier, an input end of the voltage amplifier is connected with the proximity sensor, and an output end of the voltage amplifier is connected with the voltage comparator, and is used for amplifying the voltage signal to enable the voltage signal to be matched with an input voltage of the voltage comparator.
In one embodiment, the detection module may include a voltage amplifier for adjusting the voltage signal output by the proximity sensor to match the voltage signal to the voltage comparator. As shown in fig. 4, fig. 4 is a schematic structural diagram of a radio frequency circuit according to another embodiment of the present application, where a voltage amplifier 1013 may be implemented by using an operational amplifier, an output end of the voltage amplifier 1013 is provided with a first voltage dividing resistor 309 and a second voltage dividing resistor 308 connected in series, one end of the second voltage dividing resistor 308 far away from the first voltage dividing resistor 309 is grounded, a connection point between the first voltage dividing resistor 309 and the second voltage dividing resistor 308 is connected to one input end of the voltage amplifier 1013, and another input end of the voltage amplifier 1013 is connected to an output end of the proximity sensor 1011 and is configured to receive a voltage signal output by the proximity sensor 1011. The output terminal of the voltage amplifier 1013 is connected to the input terminal of the voltage comparator 1012, and the voltage amplifier 1013 can amplify or reduce the voltage signal output from the proximity sensor 1011 so that the voltage signal matches the input voltage of the voltage comparator 1012. The specific type of the voltage amplifier can be set according to the output voltage of the proximity sensor and the input voltage of the voltage comparator, and the voltage amplifier can amplify or reduce the voltage signal output by the proximity sensor so that the voltage signal output by the proximity sensor is matched with the input voltage of the voltage comparator.
In the embodiment of the application, the voltage amplifier is arranged in the detection module, and the voltage signal output by the proximity sensor can be regulated through the voltage amplifier, so that the proximity sensor is matched with the voltage comparator.
Optionally, the switch module includes a first switch unit and a second switch unit; one end of the first switch unit is connected with the radio frequency transceiver, and the other end of the first switch unit is connected with the first end of the first power regulation branch and the first end of the second power regulation branch; one end of the second switch unit is connected with the coupler, and the other end of the second switch unit is connected with the second end of the first power regulation branch and the second end of the second power regulation branch; the first switching unit and the second switching unit control the first power regulating branch to connect the coupler and the radio frequency transceiver in a first conductive state, and control the second power regulating branch to connect the coupler and the radio frequency transceiver in a second conductive state.
In one embodiment, the switch module may include a first switch unit for connecting the radio frequency transceiver and one end of the power conditioning branch, and a second switch unit for connecting the other end of the power conditioning branch and the coupler. As shown in fig. 3 and 4, the switching module includes a first switching unit 304 and a second switching unit 305, first ends of the first power conditioning branch 306 and the second power conditioning branch 307 are ends close to the first switching unit 304, and second ends of the first power conditioning branch 306 and the second power conditioning branch 307 are ends close to the second switching unit 305. The first switch unit 304 and the second switch unit 305 may be two identical switches, where the first switch unit 304 is disposed between the rf transceiver 1021 and the power adjustment circuit, one connection end of the first switch unit 304 is connected to an input end of the rf transceiver 1021, and the other two connection ends of the first switch unit 304 are respectively connected to one ends, that is, the first ends, of the first power adjustment branch 306 and the second power adjustment branch 307, close to the rf transceiver 1021. The second switching unit 305 is disposed between the coupler 1022 and the power adjusting branch, one connection end of the second switching unit 305 is connected to the output end of the coupler 1022, and the other two connection ends of the second switching unit 305 are respectively connected to one ends, i.e., the second ends, of the first power adjusting branch 306 and the second power adjusting branch 307, which are close to the coupler 1022. The control ends of the first switch unit 304 and the second switch unit 305 are respectively connected to the output end of the voltage comparator 1012, when the voltage comparator 1012 outputs a voltage signal of 0V (i.e., a first control signal), the first switch unit 304 acts to connect the first power adjustment branch 306 and the rf transceiver 1021, and at the same time, the second switch unit 305 acts to connect the first power adjustment branch 306 and the coupler 1022, and at this time, a target rf signal output by the coupler 1022 is input to the rf transceiver 1021 after being adjusted by the first power adjustment branch 306. Conversely, when the voltage comparator outputs a voltage signal of 2V (i.e., the second control signal), the first switch unit 304 acts to connect the second power adjustment branch 307 and the rf transceiver 1021, and at the same time, the second switch unit 305 acts to connect the second power adjustment branch 307 and the coupler 1022, and at this time, the target rf signal output by the coupler 1022 is input to the rf transceiver 1021 after being adjusted by the second power adjustment branch 307.
In this embodiment of the application, the switch module includes a first switch unit disposed between the radio frequency transceiver and the power adjusting branch, and a second switch unit disposed between the power adjusting branch and the coupler, where the first switch unit and the second switch unit act synchronously, and select one power adjusting branch from the multiple power adjusting branches to connect the coupler to the radio frequency transceiver, and when one power adjusting branch is selected to connect the coupler to the radio frequency transceiver, the switch module can isolate other power adjusting branches to avoid interference from other power adjusting branches.
Optionally, the power conditioning branch comprises an attenuation circuit. As shown in fig. 3 and 4, the power adjustment circuit includes a first power adjustment branch 306 and a second power adjustment branch 307, where each of the first power adjustment branch 306 and the second power adjustment branch 307 may be formed by a pi-type attenuation circuit, where an attenuation coefficient of the first power adjustment branch 306 is greater than an attenuation coefficient of the second power adjustment branch 307, so that, for a target radio frequency signal output by the coupler 1022, a power of the radio frequency signal output by the first power adjustment branch 306 to the radio frequency transceiver 1021 is less than a power of the radio frequency signal output by the second power adjustment branch 307. When receiving the rf signal output by the first power adjustment branch 306, the rf transceiver 1021 may maintain or increase the power of the original rf signal output to the rf amplifier, that is, maintain or increase the output power of the rf amplifier, during the power adjustment process due to the smaller power of the received rf signal. Conversely, when the rf transceiver receives the rf signal output by the second power adjustment branch 307, the rf transceiver may reduce the output power of the rf amplifier or reduce the power of the original rf signal output to the rf amplifier, due to the greater power of the received rf signal, but reduce the amplitude less than when the first power adjustment branch 306 is connected. The second power adjustment branch may not adjust the power of the target radio frequency signal, and directly output the target radio frequency signal to the radio frequency transceiver. At this time, the rf transceiver may directly adjust the output power of the rf amplifier according to the power of the target rf signal. The power conditioning branch may be other types of attenuation circuits. As can be seen from the above description, the rf transceiver can control the output power of the rf amplifier to be smaller than that of the rf amplifier in the approaching state, so as to reduce the rf power of the rf antenna and the SAR value of the electronic device in which the rf circuit is located when the user is closer to the electronic device, thereby avoiding affecting the user.
Optionally, the switch module is further configured to control the target power adjustment branch of the first power adjustment branch and the second power adjustment branch to connect the coupler and the radio frequency transceiver in the case that the control signal sent by the detection module is not received.
In one embodiment, when the switch module does not receive the control signal sent by the detection module, a default power adjustment branch of the first power adjustment branch and the second power adjustment branch may be selected as a target power adjustment branch, and the coupler and the radio frequency transceiver are connected. As shown in fig. 2, the second power adjustment branch 105 may be set as a default power adjustment branch, and when the detection module fails or does not detect a human body and cannot output a control signal, the switch module 103 may select the second power adjustment branch 105 as a target power adjustment branch to connect the coupler and the rf transceiver, so that the rf transceiver may adjust the output power of the rf amplifier according to the rf signal transmitted by the second power adjustment branch, and at this time, the rf transceiver controls the rf antenna to transmit and receive signals with a lower second power.
In the embodiment of the application, a default power adjusting branch is set, and the switch module selects the default power adjusting branch to be connected with the radio frequency transceiver and the coupler under the condition that the control signal is not received, so that the radio frequency transceiver can continuously adjust the output power of the radio frequency amplifier under the condition that the detection module cannot output the control signal, and the radio frequency access module can work normally.
Optionally, the detection module comprises a plurality of detection modules, and different detection modules are arranged at different positions in the electronic device; the detection modules are used for detecting the distances between the human body and the electronic equipment at different positions respectively and controlling the conduction state of the switch module according to the distances.
In one embodiment, the detection modules may include a plurality of detection modules, and each detection module may detect a distance between a human body and the electronic device at a different location when the radio frequency circuit is installed in the electronic device. Correspondingly, the switch module can receive control signals respectively output by the detection modules, and select one power regulation branch from the power regulation branches to be connected with the radio frequency transceiver and the coupler according to the control signals.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a radio frequency circuit according to another embodiment of the present application, where the radio frequency circuit includes a first detection module 501 and a second detection module 502 that are the same, the power adjustment circuit includes 4 parallel power adjustment branches, and the switch module includes a first switch unit 304 disposed between a radio frequency transceiver 1021 and the power adjustment circuit, and a second switch unit 305 disposed between a coupler 1022 and the power adjustment circuit. The first switching unit 304 and the second switching unit 305 may each include two control terminals, each of which is connected to an output terminal of the voltage comparator 1012 in one of the detection modules. In combination with the above example, since each detection module may output a control signal of 0V or 2V, the control signals received by the two control terminals of the first switch unit 304 at the same time may be 0V and 0V, 0V and 2V, 2V and 0V, 2V and 2V, that is, the first switch unit 304 may receive control signals in four states, corresponding to the first power adjustment branch 503, the second power adjustment branch 504, the third power adjustment branch 505 and the fourth power adjustment branch 506, respectively. Similarly, the second switching unit 305 may also receive control signals corresponding to four states of the first power regulation branch 503, the second power regulation branch 504, the third power regulation branch 505 and the fourth power regulation branch 506, respectively. Accordingly, the first switching unit 304 and the second switching unit 305 may select one of the first power adjustment branch 503, the second power adjustment branch 504, the third power adjustment branch 505, and the fourth power adjustment branch 506 to connect the rf transceiver 1021 and the coupler 1022 according to the control signals output from the first detection module 501 and the second detection module 502. It should be noted that the specific number of the detection modules may be set according to the requirement, and the structure of the power adjusting circuit may be adaptively adjusted according to the number of the detection modules.
In another embodiment, when two detection modules are included in the radio frequency circuit, two power adjustment branches as shown in fig. 3 and fig. 4 may also be included in the power adjustment circuit, and the detection modules may also output a first control signal corresponding to the approaching state and a second control signal corresponding to the separating state. At this time, the switch module may select to output the first power adjustment branch circuit with the larger second radio frequency power to connect the coupler and the radio frequency transceiver when the first detection module or the second detection module outputs the first control signal, and select to output the second power adjustment branch circuit with the smaller second radio frequency power to connect the coupler and the radio frequency transceiver when the first detection module and the second detection module output the second control signal. The control logic of the switch module may be set according to a specific number of power regulation branches, which is not limited in this embodiment.
In the embodiment of the application, when the radio frequency circuit comprises a plurality of detection modules, the distance state between the user and the electronic equipment at different positions in the electronic equipment can be detected, so that the radio frequency transceiver can accurately adjust the radio frequency power of the radio frequency antenna according to the relative position and the relative distance between the user and the electronic equipment, and the SAR value in the electronic equipment can be controlled more accurately.
In summary, in the embodiment of the present application, the radio frequency circuit may include: the device comprises a detection module, a radio frequency access module, a switch module and a power regulating circuit; the radio frequency path module comprises a radio frequency transceiver, a coupler and a radio frequency antenna which are sequentially connected. The detection module is connected with the switch module and is used for detecting the distance between the human body and the electronic equipment and controlling the conduction state of the switch module according to the distance. The switch module is connected with the power regulating circuit, and the power regulating circuit comprises a first power regulating branch circuit and a second power regulating branch circuit. Under the condition that the distance is in a first distance range, the switch module is in a first conduction state, one end of the first power adjusting branch is controlled to be connected with the coupler, the other end of the first power adjusting branch is connected with the radio frequency transceiver, so that the radio frequency signal output by the coupler to the radio frequency transceiver is subjected to power adjustment, and the radio frequency transceiver is controlled to transmit and receive signals with the first power. Under the condition that the distance is in a second distance interval, the switch module is in a second conduction state, one end of the second power regulation branch is controlled to be connected with the coupler, and the other end of the second power regulation branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with second power; the second power is different from the first power. The power of the radio frequency signal received by the radio frequency transceiver is regulated by the power regulating circuit, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with different powers, the purpose of regulating the radio frequency power is achieved, the CPU can be avoided from being used for regulating the radio frequency power, and the process of configuring CPU parameters can be avoided.
As shown in fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application, where the electronic device 600 includes a processor 601 and a memory 602, and the electronic device includes a radio frequency circuit as described above. The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device described above.
Fig. 7 is a schematic hardware structure of an electronic device according to an embodiment of the present application.
The electronic device 700 includes, but is not limited to: radio frequency unit 701, network module 702, audio output unit 703, input unit 704, sensor 705, display unit 706, user input unit 707, interface unit 708, memory 709, and processor 710.
Those skilled in the art will appreciate that the electronic device 700 may also include a power source (e.g., a battery) for powering the various components, which may be logically connected to the processor 710 via a power management system so as 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 701 may include a radio frequency circuit as described above.
It should be appreciated that in embodiments of the present application, the input unit 704 may include a graphics processor (Graphics Processing Unit, GPU) 7041 and a microphone 7042, with the graphics processor 7041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and other input devices 7072. The touch panel 7071 is also referred to as a touch screen. The touch panel 7071 may include two parts, a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein. Memory 709 may be used to store software programs as well as various data including, but not limited to, application programs and an operating system. The processor 710 may integrate an application processor that primarily processes operating systems, user interfaces, applications, etc., with a modem processor that primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 710.
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 also 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 solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in 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 of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (9)
1. A radio frequency circuit, comprising: the device comprises a detection module, a radio frequency access module, a switch module and a power regulating circuit;
the radio frequency access module comprises a radio frequency transceiver, a coupler and a radio frequency antenna which are sequentially connected;
the detection module is connected with the switch module and is used for detecting the distance between a human body and the electronic equipment and controlling the conduction state of the switch module according to the distance;
the switch module is connected with the power regulating circuit, and the power regulating circuit comprises a first power regulating branch circuit and a second power regulating branch circuit;
when the distance is within a first distance interval, the switch module is in a first conduction state, one end of the first power regulation branch is controlled to be connected with the coupler, and the other end of the first power regulation branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with first power by performing power regulation on radio frequency signals output by the coupler to the radio frequency transceiver;
When the distance is within a second distance interval, the switch module is in a second conduction state, one end of the second power adjustment branch is controlled to be connected with the coupler, and the other end of the second power adjustment branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with second power by performing power adjustment on radio frequency signals output by the coupler to the radio frequency transceiver; the second power is different from the first power;
the detection module comprises a proximity sensor and a voltage comparator;
the proximity sensor is used for detecting the distance between the human body and the electronic equipment and outputting a corresponding voltage signal to the voltage comparator according to the distance;
the voltage comparator is connected with the proximity sensor and is used for receiving the voltage signal, outputting a first control signal to the switch module to enable the switch module to be in the first conduction state under the condition that the voltage signal is larger than a preset threshold value, and outputting a second control signal to the switch module to enable the switch module to be in the second conduction state under the condition that the voltage signal is smaller than the preset threshold value.
2. The radio frequency circuit of claim 1, wherein the detection module further comprises a voltage amplifier having an input coupled to the proximity sensor and an output coupled to the voltage comparator for amplifying the voltage signal to match the voltage signal to an input voltage of the voltage comparator.
3. The radio frequency circuit of claim 1, wherein the switching module comprises a first switching unit and a second switching unit;
one end of the first switch unit is connected with the radio frequency transceiver, and the other end of the first switch unit is connected with the first end of the first power regulation branch and the first end of the second power regulation branch; one end of the second switch unit is connected with the coupler, and the other end of the second switch unit is connected with the second end of the first power regulation branch and the second end of the second power regulation branch;
the first and second switching units control the first power regulating branch to connect the coupler and the radio frequency transceiver when in the first conductive state, and control the second power regulating branch to connect the coupler and the radio frequency transceiver when in the second conductive state.
4. The radio frequency circuit of claim 1, wherein the detection module comprises a plurality of different detection modules disposed at different locations in the electronic device;
the detection modules are used for detecting the distances between the human body and the electronic equipment at different positions respectively, and controlling the conduction state of the switch module according to the distances.
5. The radio frequency circuit of claim 1, wherein the power conditioning branch comprises an attenuation circuit.
6. The radio frequency circuit of claim 1, wherein the power regulation circuit further comprises a third power regulation branch;
when the distance is within a third distance interval, the switch module is in a third conducting state, one end of the third power adjustment branch is controlled to be connected with the coupler, the other end of the third power adjustment branch is connected with the radio frequency transceiver, so that the radio frequency transceiver can control the radio frequency antenna to transmit and receive signals with third power by performing power adjustment on radio frequency signals output by the coupler to the radio frequency transceiver; the third power is different from the first power and the second power.
7. The radio frequency circuit of claim 1, wherein the switching module is further configured to control a target power regulation branch of the first power regulation branch and the second power regulation branch to connect the coupler and the radio frequency transceiver without receiving a control signal sent by the detection module.
8. The radio frequency circuit of any of claims 1-7, wherein the radio frequency path module further comprises a radio frequency amplifier, an input of the radio frequency amplifier being connected to the radio frequency transceiver and an output of the radio frequency amplifier being connected to the coupler;
the radio frequency transceiver is used for controlling the radio frequency amplifier to output radio frequency signals with different powers to the radio frequency antenna according to the radio frequency signals output by the first power regulation branch or the second power regulation branch so that the radio frequency antenna receives and transmits the signals with different powers.
9. An electronic device comprising a radio frequency circuit as claimed in any one of claims 1-8.
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