CN117478164B - Radio frequency protection circuit and related device - Google Patents
Radio frequency protection circuit and related device Download PDFInfo
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- CN117478164B CN117478164B CN202311774051.5A CN202311774051A CN117478164B CN 117478164 B CN117478164 B CN 117478164B CN 202311774051 A CN202311774051 A CN 202311774051A CN 117478164 B CN117478164 B CN 117478164B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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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
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Abstract
The embodiment of the application discloses a radio frequency protection circuit and related device, the circuit includes: a radio frequency main circuit; the detection circuit comprises a first detection subcircuit with a load being a resistor and a second detection subcircuit with a load being an impedance element, and is used for respectively outputting a first detection value and a second detection value; the comparator is used for comparing the first detection value with the second detection value to obtain a comparison result; and the controller is used for controlling the output frequency of the radio frequency power supply according to the comparison result. Therefore, the circuit is in a resonance state, the negative influence of excessive reflected power on the radio frequency output signal is avoided, the stability of the radio frequency signal output by the radio frequency protection circuit is improved, and the efficiency of radio frequency communication is further improved.
Description
Technical Field
The application belongs to the technical field of wireless communication networks in the Internet industry, and particularly relates to a radio frequency protection circuit and a related device.
Background
Currently, with increasing communication demands in modern society, radio frequency communication (RF communication) is commonly applied to aspects of mobile communication, satellite communication, cellular network, etc. to achieve high quality wireless communication. However, the rf circuit may additionally generate reflected power due to its high frequency characteristic, and if the reflected power is too large, the rf signal may be unstable, which may further result in low communication transmission efficiency, or even risk of damaging the rf system.
Disclosure of Invention
In a first aspect, an embodiment of the present application provides a radio frequency protection circuit, including:
the radio frequency main circuit comprises a radio frequency power supply;
the detection circuit is connected with the radio frequency main circuit and comprises a first detection sub-circuit and a second detection sub-circuit, wherein the first detection sub-circuit is connected with the second detection sub-circuit in parallel, a load in the first detection sub-circuit is a resistor, a load in the second detection sub-circuit is an impedance element, the first detection sub-circuit is used for acquiring a first detection value, and the second detection sub-circuit is used for acquiring a second detection value;
the first input end of the comparator is connected with the first detection sub-circuit, the second input end of the comparator is connected with the second detection sub-circuit, and the comparator is used for comparing the first detection value with the second detection value and outputting a comparison result;
and the controller is respectively connected with the output ends of the radio frequency power supply and the comparator and is used for controlling the output frequency of the radio frequency power supply according to the comparison result.
It can be seen that in the embodiment of the application, the controller receives the offset angle between the first detection sub-circuit and the second detection sub-circuit compared by the comparator, and determines the adjustment strategy for the output frequency of the radio frequency power supply, so that the circuit is in a resonance state, the negative influence of excessive reflected power on the radio frequency output signal is avoided, the stability of the radio frequency protection circuit for outputting the radio frequency signal is improved, and the efficiency of radio frequency communication is further improved.
In a possible embodiment, the first detection value is a voltage value of the first detection sub-circuit, the second detection value is a current value of the second detection sub-circuit, and the comparator is configured to: comparing the deviation angle of the voltage value and the current value.
In the embodiment of the application, the voltage value and the current value are compared by the comparator, and the radio frequency power supply is adjusted by the controller according to the offset angle to improve the output frequency, so that the circuit is in or close to a resonance state, and the stability of the radio frequency protection circuit for outputting radio frequency signals is improved.
In a possible embodiment, the radio frequency protection circuit includes a power detection circuit, the power detection circuit including: an output power detection circuit and a reflected power detection circuit; the input end of the output power detection circuit is connected with the output end of the radio frequency power supply, the output end of the output power detection circuit is connected with the controller, and the output power detection circuit is used for converting radio frequency signals of the radio frequency power supply into corresponding radio frequency electric signals and outputting the corresponding radio frequency electric signals to the controller; the input end of the reflected power detection circuit is connected with the output end of the detection circuit, the output end of the reflected power detection circuit is connected with the controller, and the reflected power detection circuit is used for converting the reflected radio frequency signal into a reflected electric signal and outputting the reflected electric signal to the controller.
In one possible embodiment, the controller is further configured to: determining a reflection coefficient according to the radio frequency electric signal and the reflected electric signal; and stopping the operation of controlling the output frequency of the radio frequency power supply according to the comparison result when the reflection coefficient is less than or equal to the preset coefficient threshold value.
In the embodiment of the application, the reflection coefficient is determined according to the radio frequency electric signal and the reflected electric signal, when the reflection coefficient does not exceed the safety threshold, the operation of adjusting the radio frequency output frequency is suspended, the energy consumption can be reduced, whether the frequency modulation operation is performed or not is reflected by detecting the relation between the reflection power and the safety threshold, the frequency modulation adjustment intelligence of the radio frequency protection circuit is improved, and the high-efficiency reduction of the reflection power of the radio frequency protection circuit is facilitated.
In one possible embodiment, the controller is further configured to: when the offset angle is larger than 0, controlling the radio frequency power supply to reduce the output frequency; when the offset angle is smaller than 0, the radio frequency power supply is controlled to increase the output frequency.
In one possible embodiment, the controller is further configured to: and determining a frequency value for adjusting the output frequency according to the difference value between the offset angle and the 0-degree angle.
In the embodiment of the application, the frequency value of the output frequency is determined by the difference value between the offset angle and the 0-degree angle, so that the accuracy and objectivity of adjusting the output frequency of the radio frequency power supply by the controller are improved, the reflected power of the output signal of the radio frequency power supply is reduced by adjusting the output frequency, the stability of the output radio frequency signal is improved, the protection effect of the radio frequency circuit is realized, and the efficiency of radio frequency communication is further improved.
In one possible embodiment, the output power detection circuit includes a first detection circuit and a first rectification circuit; the input end of the first detection circuit is the input end of the output power detection circuit, the output end of the first detection circuit is connected with the input end of the first rectification circuit, the output end of the first rectification circuit is the output end of the output power detection circuit, the first detection circuit is used for detecting radio frequency electric signals, and the first rectification circuit is used for converting the radio frequency electric signals into direct current electric signals and outputting the direct current electric signals.
In one possible embodiment, the reflected power detection circuit includes a second detection circuit and a second rectification circuit; the input end of the second detection circuit is the input end of the reflected power detection circuit, the output end of the second detection circuit is connected with the input end of the second rectification circuit, the output end of the second rectification circuit is the output end of the reflected power detection circuit, the second detection circuit is used for detecting the reflected electric signal, and the second rectification circuit is used for converting the reflected electric signal into a direct current signal and outputting the direct current signal.
In the embodiment of the application, the output power and the reflected power are easier to detect by converting the radio frequency signal into the corresponding direct current signal to be output to the controller after detection and rectification.
In a possible embodiment, the radio frequency protection circuit further comprises an isolation circuit, and an input end of the isolation circuit is connected with an output end of the detection circuit; the isolation circuit comprises an electromagnetic interference suppression circuit and a blocking circuit, wherein the electromagnetic interference suppression circuit is used for suppressing electromagnetic interference phenomenon in the radio frequency main circuit, and the blocking circuit is used for isolating direct current electric signals output by the radio frequency power supply.
In the embodiment of the application, the output radio frequency signal can be more stable by performing the operations of blocking and suppressing electromagnetic interference on the radio frequency signal.
In a second aspect, embodiments of the present application provide an electronic device comprising some or all of the circuitry described in the first aspect, for example.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a radio frequency protection circuit according to an embodiment of the present application;
FIG. 2 is a schematic circuit topology of a detection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit topology diagram of a radio frequency protection circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a power detection circuit according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.
The term "plurality" as used in the embodiments herein refers to two or more. The "connection" in the embodiments of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in any way in the embodiments of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Embodiments of the present application are described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a radio frequency protection circuit according to an embodiment of the present application, and as shown in fig. 1, the radio frequency protection circuit includes: a radio frequency main circuit 110, a detection circuit 120, a comparator 130, and a controller 140; the radio frequency main circuit 110 includes a radio frequency power source 111, and the detection circuit 120 includes a first detection sub-circuit 121 and a second detection sub-circuit 122, where the first detection sub-circuit 121 and the second detection sub-circuit 122 are connected in parallel.
The output port of the rf main circuit 110 is connected to the input ports of the first detection sub-circuit 121 and the second detection sub-circuit 122 in the detection circuit 120, the output ports of the first detection sub-circuit 121 and the second detection sub-circuit 122 are connected to the input port of the comparator 130, the output port of the comparator 130 is connected to the input port of the controller 140, and the output port of the controller 140 is connected to the input port of the rf power supply 111 in the rf main circuit 110.
The first detection sub-circuit 121 is provided with a resistor as a load, receives a radio frequency signal from the radio frequency power supply 111, and obtains a first detection value; the second detection sub-circuit 122 is provided with an impedance element, such as an inductance or a capacitance, and receives the radio frequency signal from the radio frequency power supply 111 and obtains a second detection value; the comparator 130 receives the first detection value from the first detection sub-circuit 121 and the second detection value from the second detection sub-circuit 122, compares them to obtain a comparison result, reflects the capacitive or inductive characteristic of the whole radio frequency circuit, and outputs the comparison result to the controller 140; the controller 140 adjusts the rf signal output frequency of the rf power supply 111 in the rf main circuit 110 based on the comparison result, so as to reduce the reflected power of the reflected signal of the rf signal, and ensure that the rf circuitry can output the rf signal with high efficiency. The stability of the output radio frequency signal is improved.
It can be seen that in the embodiment of the application, the controller receives the offset angle between the first detection sub-circuit and the second detection sub-circuit compared by the comparator, and determines the adjustment strategy for the output frequency of the radio frequency power supply, so that the circuit is in a resonance state, the negative influence of excessive reflected power on the radio frequency output signal is avoided, the stability of the radio frequency protection circuit for outputting the radio frequency signal is improved, and the efficiency of radio frequency communication is further improved.
For example, referring to fig. 2, fig. 2 is a schematic circuit diagram of an analog circuit of a detection circuit according to an embodiment of the present application, and as shown in fig. 2, a first detection sub-circuit includes a first resistor R1 and a second resistor R2; the second detection subcircuit comprises an impedance element Z1 and a third resistor R3; the input end of the first resistor R1 is connected in parallel with the input end of the impedance element Z1, the output end of the first resistor R1 is respectively connected with the second resistor R2 and the negative input end of the comparator 130, and the output end of the impedance element Z1 is respectively connected with the third resistor R3 and the positive input end of the comparator 130. The second resistor R2 and the third resistor R3 are respectively grounded to protect the circuit.
In a possible embodiment, the first detection value is a voltage value of the first detection sub-circuit, the second detection value is a current value of the second detection sub-circuit, and the comparator is configured to: comparing the deviation angle of the voltage value and the current value.
The comparator judges the current phase deviation angle of the received voltage value and the current value and outputs a judging result to the controller.
Specifically, the controller is further configured to, after receiving the determination result: when the offset angle is larger than 0, controlling the radio frequency power supply to reduce the output frequency; when the offset angle is smaller than 0, the radio frequency power supply is controlled to increase the output frequency.
In the embodiment of the application, the voltage value and the current value are compared by the comparator, and the radio frequency power supply is adjusted by the controller according to the offset angle to improve the output frequency, so that the circuit is in or close to a resonance state, and the stability of the radio frequency protection circuit for outputting radio frequency signals is improved.
For example, since the rf power source is used to convert the input dc power into the high-frequency ac power, the currents in the rf protection circuit are all ac currents, and the input voltages are all ac voltages. Since the first resistor R1 and the impedance element Z1 are devices connected in parallel, the ac voltage at both ends is the same, and since the ac voltage is a voltage whose direction and magnitude of current periodically change at a certain frequency, the following formula exists:
。
where Uo is the peak voltage (or amplitude), ω is the angular frequency, and t is time.
Likewise, the currents of the first resistor R1 and the impedance element Z1 are calculated specifically according to the following formula:
。
where Io is the peak current (or amplitude), ω is the angular frequency, t is the time,is the offset angle.
Wherein, the comparator obtains two offset angles by collecting the voltage value U of the first resistor R1 and the current value I of the impedance element Z1The absolute value of the difference between the phase angles is the offset angle. When the deviation angle->When the voltage phase of the radio frequency protection circuit is larger than 0, the voltage phase of the radio frequency protection circuit is characterized as being ahead of the current phase, so that the whole radio frequency protection circuit is determined to be in an inductive state, and then the output frequency is reduced by adjusting the radio frequency power supply through the controller, so that the circuit is in or close to a resonance state; as same asAnd when the deviation angle is smaller than 0, the current phase in the radio frequency protection circuit is characterized as leading to the voltage phase, so that the whole radio frequency protection circuit is determined to be in a capacitive state, and the radio frequency power supply is regulated by the controller to improve the output frequency, so that the circuit is in or close to a resonance state, the negative influence of excessive reflected power on a radio frequency output signal is avoided, the stability of the radio frequency signal output by the radio frequency protection circuit is improved, and the efficiency of radio frequency communication is further improved.
In one possible embodiment, the controller is further configured to: and determining a frequency value for adjusting the output frequency according to the difference value between the offset angle and the 0-degree angle.
The frequency adjustment value of the controller to the radio frequency power supply is calculated and determined according to the absolute value of the difference between the offset angle and 0 degree, namely, the increasing frequency or the decreasing frequency is determined according to the sign of the difference between the offset angle and 0 degree, and the specific frequency value of the increasing or the decreasing frequency is determined according to the absolute value of the difference between the offset angle and 0 degree.
In the embodiment of the application, the frequency value of the output frequency is determined by the difference value between the offset angle and the 0-degree angle, so that the accuracy and objectivity of adjusting the output frequency of the radio frequency power supply by the controller are improved, the reflected power of the output signal of the radio frequency power supply is reduced by adjusting the output frequency, the stability of the output radio frequency signal is improved, the protection effect of the radio frequency circuit is realized, and the efficiency of radio frequency communication is further improved.
In one possible embodiment, the controller is further configured to: determining a reflection coefficient according to the radio frequency electric signal and the reflected electric signal; and stopping the operation of controlling the output frequency of the radio frequency power supply according to the comparison result when the reflection coefficient is less than or equal to the preset coefficient threshold value.
When the radio frequency protection circuit works in connection with a load, the reflection coefficients generated by the different loads are different due to different impedances of the different loads. The reflection coefficient of the load is determined by acquiring the output power and the reflected power of the radio frequency signal. When the reflection coefficient is out of the preset coefficient threshold value, the phase of the current and the voltage of the radio frequency protection circuit is not matched, so that capacitive or inductive circuit characteristics exist, the reflection power needs to be reduced by adjusting the frequency, and the change of the reflection power can be reflected by the reflection coefficient.
In the embodiment of the application, the reflection coefficient is determined according to the radio frequency electric signal and the reflected electric signal, when the reflection coefficient does not exceed the safety threshold, the operation of adjusting the radio frequency output frequency is suspended, the energy consumption can be reduced, whether the frequency modulation operation is performed or not is reflected by detecting the relation between the reflection power and the safety threshold, the frequency modulation adjustment intelligence of the radio frequency protection circuit is improved, and the high-efficiency reduction of the reflection power of the radio frequency protection circuit is facilitated.
Referring to fig. 3, fig. 3 is a schematic circuit topology diagram of a radio frequency protection circuit according to an embodiment of the present application, as shown in fig. 3, including a radio frequency power supply 111, an inductor L, a capacitor C, and a fourth resistor R4, where an output port of the radio frequency power supply 111 is connected to an input port of the capacitor C, an output port of the capacitor C is connected to an input port of the inductor L, an output port of the inductor L is connected to an input port of the fourth resistor R4, and an output port of the fourth resistor R4 is sequentially connected to the detection circuit 120, the comparator 130, and the controller 140 shown in fig. 1, and an output port of the controller 140 is connected to an input port of the radio frequency power supply 111.
The effect in which the inductance L and the fourth resistance R are connected in series in the circuit is that when there is a natural response in the circuit, the series circuit of the inductance L and the fourth resistance R is adapted, the ability of the inductance L to store energy enables it to react to the natural response, and the fourth resistance R can reduce the sensitivity of the resistance to external disturbances. And, since the rf power source 111 functions to output high frequency ac power, the RL series circuit can produce a faster response and better cope with high frequency interference also at high frequencies. Furthermore, the RL series circuit can also be used for tuning circuits, which can be made to respond to a specific frequency interval when using an appropriate combination of inductance and resistance.
Wherein the radio frequency power supply 111 is a power supply device for supplying radio frequency signals. The main principle of the rf power supply 111 shown in fig. 3 is to convert dc power into an rf ac signal and output it to a load.
In one possible embodiment, the radio frequency protection circuit further comprises a power detection circuit comprising: an output power detection circuit and a reflected power detection circuit; the input end of the output power detection circuit is connected with the output end of the radio frequency power supply, the output end of the output power detection circuit is connected with the controller, and the output power detection circuit is used for converting radio frequency signals of the radio frequency power supply into corresponding radio frequency electric signals and outputting the corresponding radio frequency electric signals to the controller; the input end of the reflected power detection circuit is connected with the output end of the detection circuit, the output end of the reflected power detection circuit is connected with the controller, and the reflected power detection circuit is used for converting the reflected radio frequency signal into a reflected electric signal and outputting the reflected electric signal to the controller.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power detection circuit according to an embodiment of the present application, and as shown in fig. 4, the radio frequency protection circuit further includes a power detection circuit 400, where the power detection circuit 400 includes an output power detection circuit 410 and a reflected power detection circuit 420.
The input end of the output power detection circuit 410 is connected to the output end of the rf power supply 111 shown in fig. 1, the output end of the output power detection circuit 410 is connected to the input end of the controller 140 shown in fig. 1, and the output power detection circuit 410 is configured to convert the acquired rf signal of the rf power supply into a corresponding rf electrical signal and output the corresponding rf electrical signal to the controller 140.
The input end of the reflected power detection circuit 420 is connected to the output end of the detection circuit 120 shown in fig. 1, the output end of the reflected power detection circuit 420 is connected to the input end of the controller 140 shown in fig. 1, and the reflected power detection circuit 420 is configured to convert the reflected signal of the acquired radio frequency signal into a reflected electric signal and output the reflected electric signal to the controller 140.
By way of example, the power detection circuit may employ a balun circuit.
Specifically, in one possible embodiment, the output power detection circuit includes a first detection circuit and a first rectification circuit; the input end of the first detection circuit is the input end of the output power detection circuit, the output end of the first detection circuit is connected with the input end of the first rectification circuit, the output end of the first rectification circuit is the output end of the output power detection circuit, the first detection circuit is used for detecting radio frequency electric signals, and the first rectification circuit is used for converting the radio frequency electric signals into direct current electric signals and outputting the direct current electric signals.
Specifically, in one possible embodiment, the reflected power detection circuit includes a second detection circuit and a second rectification circuit; the input end of the second detection circuit is the input end of the reflected power detection circuit, the output end of the second detection circuit is connected with the input end of the second rectification circuit, the output end of the second rectification circuit is the output end of the reflected power detection circuit, the second detection circuit is used for detecting the reflected electric signal, and the second rectification circuit is used for converting the reflected electric signal into a direct current signal and outputting the direct current signal.
In the embodiment of the application, the output power and the reflected power are easier to detect by converting the radio frequency signal into the corresponding direct current signal to be output to the controller after detection and rectification.
In a possible embodiment, the radio frequency protection circuit further comprises an isolation circuit, and an input end of the isolation circuit is connected with an output end of the detection circuit; the isolation circuit comprises an electromagnetic interference suppression circuit and a blocking circuit, wherein the electromagnetic interference suppression circuit is used for suppressing electromagnetic interference phenomenon in the radio frequency main circuit, and the blocking circuit is used for isolating direct current electric signals output by the radio frequency power supply.
The electromagnetic interference suppression circuit is used for suppressing electromagnetic interference phenomena in the circuit and preventing electromagnetic energy generated by the radio frequency circuit from interfering other equipment or electromagnetic energy generated by other equipment from interfering the radio frequency circuit. The DC blocking circuit is used for isolating the DC signal and avoiding mutual interference between the DC signal of the radio frequency signal and the DC signal of the load.
In the embodiment of the application, the output radio frequency signal can be more stable by performing the operations of blocking and suppressing electromagnetic interference on the radio frequency signal.
The embodiment of the application also provides electronic equipment, which comprises the radio frequency protection circuit provided by any one of the embodiments.
It should be noted that, for simplicity of description, the foregoing embodiments of the application are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, such as the above-described division of units, merely a division of logic functions, and there may be additional manners of dividing in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing has outlined rather broadly the embodiments of the present application, and detailed description of the principles and embodiments of the present application have been provided herein with the application of specific examples, the above examples being provided solely to assist in the understanding of the present application and its core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (7)
1. A radio frequency protection circuit, comprising:
the radio frequency main circuit comprises a radio frequency power supply;
the detection circuit is connected with the radio frequency main circuit and comprises a first detection sub-circuit and a second detection sub-circuit, wherein the first detection sub-circuit is connected with the second detection sub-circuit in parallel, a load in the first detection sub-circuit is a resistor, a load in the second detection sub-circuit is an impedance element, the first detection sub-circuit is used for acquiring a first detection value, the second detection sub-circuit is used for acquiring a second detection value, the first detection value is a voltage value of the first detection sub-circuit, and the second detection value is a current value of the second detection sub-circuit;
the first input end of the comparator is connected with the first detection sub-circuit, and the second input end of the comparator is connected with the second detection sub-circuit and is used for comparing the deviation angle of the voltage value and the current value;
and the controller is respectively connected with the output ends of the radio frequency power supply and the comparator and is used for controlling the output frequency of the radio frequency power supply to reduce a first frequency value according to the difference value between the offset angle and the 0 degree angle when the offset angle is larger than 0 or controlling the output frequency of the radio frequency power supply to increase a second frequency value according to the difference value between the offset angle and the 0 degree angle when the offset angle is smaller than 0 so that the radio frequency main circuit is in a resonance state.
2. The radio frequency protection circuit of claim 1, further comprising a power detection circuit, the power detection circuit comprising: an output power detection circuit and a reflected power detection circuit;
the input end of the output power detection circuit is connected with the output end of the radio frequency power supply, the output end of the output power detection circuit is connected with the controller, and the output power detection circuit is used for converting radio frequency signals of the radio frequency power supply into corresponding radio frequency electric signals and outputting the corresponding radio frequency electric signals to the controller;
the input end of the reflected power detection circuit is connected with the output end of the detection circuit, the output end of the reflected power detection circuit is connected with the controller, and the reflected power detection circuit is used for converting the reflected radio frequency signal into a reflected electric signal and outputting the reflected electric signal to the controller.
3. The radio frequency protection circuit of claim 2, wherein the controller is further configured to:
determining a reflection coefficient according to the radio frequency electric signal and the reflection electric signal; the method comprises the steps of,
and stopping the operation of controlling the output frequency of the radio frequency power supply according to the difference value between the offset angle and the 0-degree angle when the reflection coefficient is smaller than or equal to a preset coefficient threshold value.
4. The radio frequency protection circuit according to claim 2, wherein the output power detection circuit includes a first detection circuit and a first rectification circuit;
the input end of the first detection circuit is the input end of the output power detection circuit, the output end of the first detection circuit is connected with the input end of the first rectification circuit, the output end of the first rectification circuit is the output end of the output power detection circuit, the first detection circuit is used for detecting the radio frequency electric signal, and the first rectification circuit is used for converting the radio frequency electric signal into a direct current electric signal and outputting the direct current electric signal.
5. The radio frequency protection circuit of claim 2, wherein the reflected power detection circuit comprises a second detection circuit and a second rectification circuit;
the input end of the second detection circuit is the input end of the reflected power detection circuit, the output end of the second detection circuit is connected with the input end of the second rectification circuit, the output end of the second rectification circuit is the output end of the reflected power detection circuit, the second detection circuit is used for detecting the reflected electric signal, and the second rectification circuit is used for converting the reflected electric signal into a direct current signal and outputting the direct current signal.
6. The radio frequency protection circuit of claim 1, further comprising an isolation circuit, an input of the isolation circuit being connected to an output of the detection circuit;
the isolation circuit comprises an electromagnetic interference suppression circuit and a blocking circuit, wherein the electromagnetic interference suppression circuit is used for suppressing electromagnetic interference phenomenon in the radio frequency main circuit, and the blocking circuit is used for isolating direct current electric signals output by the radio frequency power supply.
7. An electronic device comprising a radio frequency protection circuit as claimed in any one of claims 1-6.
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