CN110492854A - Radio frequency protects circuit and device - Google Patents
Radio frequency protects circuit and device Download PDFInfo
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- CN110492854A CN110492854A CN201910834707.5A CN201910834707A CN110492854A CN 110492854 A CN110492854 A CN 110492854A CN 201910834707 A CN201910834707 A CN 201910834707A CN 110492854 A CN110492854 A CN 110492854A
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- 239000003990 capacitor Substances 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 7
- 230000001012 protector Effects 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
Abstract
The invention discloses a kind of radio frequency protection circuit and device, the radio frequency protection circuit includes: control circuit, power amplifier and reflection protection circuit；The reflection protection circuit is detected for the reflection signal to the radiofrequency signal, and protection signal or recovery signal are persistently sent to the control circuit according to the signal voltage of the reflection signal；The control circuit, for when receiving the protection signal, the radiofrequency signal after reduction to be exported to the power amplifier；The extensive time multiplexed signal is being received, radiofrequency signal is being exported to the power amplifier.The present invention can carry out reflection protection to each device in radio circuit, and power loss is lower during reflection protection, additionally it is possible to avoid that superheating phenomenon occurs, improve the stability and safety of radio circuit reflection protection.
Description
Technical field
The present invention relates to radio circuit field more particularly to radio frequency protection circuits and device.
Background technique
Radio circuit can be widely applied to radar, electronic countermeasure, microwave communication, satellite communication and wait electronic systems
In.Powerful power discharging device is very easy to damage because reflection power is excessive as the Primary Component in radio circuit, is
Prevent the radio circuit from damaging in the process of running since reflection power is excessive, usually setting protection circuit comes to radio circuit
Power discharging device protected.Generally use the mode of setting circulator at present to protect to power discharging device, but due to electricity
Subsystem, which further includes that bandwidth, power are big and small in size etc., to be required, and larger volume can not only be occupied by being protected using circulator,
A large amount of power loss will be also generated, to seriously affect the output power of radiofrequency signal.What circulator generated simultaneously is a large amount of
Power loss can be converted into thermal energy, therefore circulator is also easy to cross cause thermal damage because working long hours.
Summary of the invention
The main purpose of the present invention is to provide a kind of radio frequency protection circuit and devices, it is intended to solve existing circulator and protect
The problem of protection circuit power loss is big, and overheat easily occurs and damages.
To achieve the goals above, the present invention provides a kind of radio frequency protection circuit, comprising:
The first end of control circuit, the control circuit is connect with radiofrequency signal input interface, defeated to receive radiofrequency signal
The radiofrequency signal that incoming interface issues；
Power amplifier, the input terminal of the power amplifier are connect with the second end of the control circuit；
The input terminal of reflection protection circuit, the reflection protection circuit is connect with the output end of the power amplifier, institute
The output end for stating reflection protection circuit is connect with radiofrequency signal output interface, the control terminal of the reflection protection circuit also with it is described
The controlled end of control circuit connects；
Wherein, the reflection protection circuit is detected for the reflection signal to the radiofrequency signal, and according to described
The signal voltage for reflecting signal persistently sends protection signal to the control circuit or restores signal；
The control circuit, for when receiving the protection signal, the radiofrequency signal after reduction to be exported to described
Power amplifier；The extensive time multiplexed signal is being received, radiofrequency signal is being exported to the power amplifier.
Optionally, the reflection protection circuit includes directional coupler, detecting circuit, protection circuit；
The input terminal of the directional coupler is connect with the output end of the power amplifier, the directional coupler it is straight
Go side is connect with radiofrequency signal output interface, and the coupled end of the directional coupler is connect with the input terminal of the detecting circuit；
The output end of the detecting circuit is connect with the input terminal of the protection circuit, the output end of the protection circuit and the control
The controlled end of circuit connects；
Wherein, the directional coupler, the reflection signal for will be coupled according to the radiofrequency signal are sent to institute
State detecting circuit；
The detecting circuit, for being detected to the reflection signal to obtain the signal voltage of the reflection signal,
And the signal voltage is sent to the protection circuit；
The protection circuit, for exporting corresponding signal or the protection signal of restoring to the control according to the signal voltage
Circuit processed.
Optionally, the detecting circuit includes detector diode, second resistance, 3rd resistor and first capacitor；
The anode of the detector diode is connect with the coupled end of the directional coupler, the cathode of the detector diode
It is connect by the second resistance with the input terminal of the protection circuit, the cathode of the detector diode passes through first electricity
Hold ground connection, the cathode of the detector diode is also grounded by the 3rd resistor.
Optionally, the detecting circuit further includes the second capacitor；The input terminal of the protection circuit also passes through described second
Capacity earth.
Optionally, the control circuit includes the 4th resistance, first diode, third capacitor and the 4th capacitor, and described the
The first end of four resistance is connect with the output end of the protection circuit, the second end and the first diode of the 4th resistance
Anode connection, the first diode cathode ground connection；The second end of 4th resistance also respectively by third capacitor with
The connection of radiofrequency signal input interface, is connect by the 4th capacitor with the input terminal of the power amplifier.
Optionally, the protection circuit includes the first operational amplifier, and the first anode of first operational amplifier is defeated
Enter end to connect with the second end of the second resistance, to receive the signal voltage that the detecting circuit is sent, first operation
First negative input of amplifier connects the first reference level, the first output end of first operational amplifier and the control
The controlled end of circuit connects；
Wherein, first operational amplifier, for the signal voltage to be compared with first reference level,
When the signal voltage is greater than first reference level, Xiang Suoshu control circuit exports high level；In the signal voltage
When less than first reference level, Xiang Suoshu control circuit exports low level.
Optionally, the protection circuit further includes the first triode, the first power supply, the 5th resistance, the 6th resistance, the 7th electricity
Resistance and eleventh resistor；
The base that first output end of first operational amplifier passes through the eleventh resistor and first triode
Pole connection；First power supply is connect with the first end of the 5th resistance, the second end and described first of the 5th resistance
The collector of triode connects, the emitter ground connection of first triode；
First power supply is also connect with the first end of the 6th resistance, the second end of the 6th resistance and described the
The first end of seven resistance connects, the second end ground connection of the 7th resistance, the second end of the 6th resistance and first fortune
The the second electrode input end connection for calculating amplifier, using the voltage of the second end of the 6th resistance as the second reference level,
Second negative input of first operational amplifier is connect with the collector of first triode, by the described 1st
The collector voltage of pole pipe is as protection detection voltage, the second output terminal and the control circuit of first operational amplifier
Controlled end connection；
Wherein, first operational amplifier, for the signal voltage to be compared with first reference level,
When the signal voltage is greater than first reference level, the base stage of the first triode of Xiang Suoshu exports high level；Described
When signal voltage is less than first reference level, the base stage of the first triode of Xiang Suoshu exports low level.
First operational amplifier is also used to the protection detecting voltage and compare with second reference level
Compared with when protection detection voltage is less than second reference level, Xiang Suoshu control circuit exports high level；In the guarantor
When shield detection voltage is greater than second reference level, Xiang Suoshu control circuit exports low level.
Optionally, the protection circuit further includes the 8th resistance and the 5th capacitor；The first end of 8th resistance and institute
State the second end connection of the 5th resistance, the second end ground connection of the 8th resistance, the first end of the 5th capacitor and described the
The second end of five resistance connects, the second end ground connection of the 5th capacitor.
Optionally, the control circuit further includes the 9th resistance, the 6th capacitor and the 7th capacitor, first operation amplifier
The second output terminal of device also passes through institute by the 9th resistance eutral grounding, the second output terminal of first operational amplifier respectively
State the 6th capacitor and the 7th capacity earth.
In addition, to achieve the above object, the present invention also provides a kind of radio frequency protector, the radio frequency protector includes
Radio frequency protects circuit, and the radio frequency protection circuit is configured as radio frequency protection circuit as described above.
The present invention, can reflection signal to the radiofrequency signal that power amplifier exports by setting reflection protection circuit
Signal voltage is detected, to determine the reflection power of reflection signal.It is greater than preset power threshold in the power of reflection signal
When, protection signal can be issued to control circuit by reflection protection circuit, so that control circuit will be sent to power amplifier
Radiofrequency signal reduce；It, can be by reflection protection circuit to control when the power for reflecting signal is lower than predetermined power threshold value
Circuit, which issues, restores signal, so that control circuit increases the radiofrequency signal for being sent to power amplifier, to avoid reflecting
The devices such as power amplifier are damaged when power is excessive.Reflection protection circuit can be used in the reflection protection of high-power RF circuit,
Have the characteristics that structure is simple, small in size.Power loss is lower during reflection protection, therefore can also avoid overheating
Phenomenon improves the stability and safety of radio circuit reflection protection.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram that radio frequency of the present invention protects one embodiment of circuit；
Fig. 2 is the electrical block diagram that Fig. 1 radio frequency protects one embodiment of circuit；
Fig. 3 is the electrical block diagram that the first operational amplifier in one embodiment of circuit is protected in Fig. 2；
Fig. 4 is the electrical block diagram that the first operational amplifier in another embodiment of circuit is protected in Fig. 2.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Drawing reference numeral explanation:
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
The present invention provides a kind of radio frequency protection circuit, is applied in radio frequency protector, which can use
In protection radio circuit, damage is generated to circuit devcie when avoiding reflection power excessive.
Referring to Fig. 1, in one embodiment, radio frequency protection circuit includes that control circuit 20, power amplifier 30 and reflection are protected
Protection circuit 40.The first end of control circuit 20 is connect with radiofrequency signal input interface 10, to receive radiofrequency signal input interface 10
The radiofrequency signal of sending.The input terminal of power amplifier 30 is connect with the second end of control circuit 20, reflection protection circuit 40
Input terminal is connect with the output end of power amplifier 30, and the output end and radiofrequency signal output interface 50 of reflection protection circuit 40 connect
It connects, the radiofrequency signal that radiofrequency signal input interface 10 issues is sent to radiofrequency signal output interface 50.Reflection protection circuit
40 control terminal is also connect with the controlled end of control circuit 20.
Reflection protection circuit 40 can detect the reflection signal of radiofrequency signal in circuit, to obtain reflection signal pair
The signal voltage answered, and determined according to the size of signal voltage and persistently send protection signal or recovery signal to control circuit 20.
When signal voltage is larger, can persistently send protection signal to control circuit 20 can be to control when signal voltage is smaller
Circuit 20, which is persistently sent, restores signal.
Control circuit 20 can receive the protection signal of the sending of reflection protection circuit 40 or restore signal, receive protection
When signal, export after the radiofrequency signal that radiofrequency signal input interface 10 receives is reduced to power amplifier 30；It is connecing
Extensive time multiplexed signal is received, the radiofrequency signal that radiofrequency signal input interface 10 receives is exported to power amplifier 30.Wherein, defeated
The radiofrequency signal received from radiofrequency signal input interface 10 is not higher than to the radiofrequency signal of power amplifier 30 out.
In the present embodiment, radiofrequency signal input interface 10 issues radiofrequency signal, and control circuit 20 is receiving radio frequency letter
Power amplifier 30 is sent to after number, power amplifier 30 is sent to reflection protection circuit 40 after handling radiofrequency signal,
Reflection protection circuit 40 detects the reflection signal of radiofrequency signal, obtains the signal voltage of reflection signal, and according to signal
The size of voltage selects persistently to send protection signal to control circuit 20 or restores signal.Control circuit 20 is receiving protection letter
Number when, will be sent to power amplifier 30 radiofrequency signal reduce；Extensive time multiplexed signal is being received, power amplifier will be sent to
30 radiofrequency signal increases.
The present embodiment is by setting reflection protection circuit 40, the reflection for the radiofrequency signal that can be exported to power amplifier 30
The signal voltage of signal is detected, to determine the reflection power of reflection signal.It is greater than preset function in the power of reflection signal
When rate threshold value, protection signal can be issued to control circuit 20 by reflection protection circuit 40, so that control circuit 20 will be sent
Radiofrequency signal to power amplifier 30 reduces；When the power for reflecting signal is lower than predetermined power threshold value, reflection can be passed through
It protects circuit 40 to issue control circuit 20 and restores signal, so that control circuit 20 believes the radio frequency for being sent to power amplifier 30
Number increase, to avoid damaging the equal devices of power amplifier 30 when reflection power is excessive.Reflection protection circuit 40 can be used in
The reflection protection of high-power RF circuit has the characteristics that structure is simple, small in size.During reflection protection power loss compared with
It is low, therefore can also avoid that superheating phenomenon occurs, improve the stability and safety of radio circuit reflection protection.
Further, please with reference to Fig. 1 and Fig. 2, above-mentioned reflection protection circuit 40 may include directional coupler 41, inspection
Wave circuit 42, protection circuit 43 and first resistor R1.Directional coupler 41 includes input terminal, straight-through end, coupled end and isolation
End, the input terminal of directional coupler 41 are connect with the output end of power amplifier 30, lead directly to end and radiofrequency signal output interface 50
Connection, coupled end are connect with the input terminal of detecting circuit 42, and isolation end then passes through first resistor R1 and is grounded.Detecting circuit 42 it is defeated
Outlet is connect with the input terminal of protection circuit 43, and the output end of protection circuit 43 is connect with the controlled end of control circuit 20.
The directional coupler 41 is oriented opposite coupler, is inputted in radiofrequency signal from the input terminal of directional coupler 41
When, directional coupler 41 can couple radiofrequency signal, and the reflection signal in radiofrequency signal is passing through after overcoupling
Coupled end output, other signals then pass through straight-through end output to radiofrequency signal output interface 50.That is, directional coupler 41 can incite somebody to action
Reflection signal in radiofrequency signal is separated and is sent to detecting circuit 42.Detecting circuit 42 receive reflection signal after,
Reflection signal can be rectified, to obtain the corresponding d. c. voltage signal of reflection signal, that is, reflect the signal voltage of signal,
And the signal voltage is sent to protection circuit 43.Protect circuit 43 after receiving signal voltage, it can be according to signal electricity
Pressure determines the power of reflection signal, to export corresponding signal or the protection signal of restoring to control circuit 20.Reflection signal compared with
Qiang Shi, output protection signal to control circuit 20, so that control circuit 20 reduces the radiofrequency signal of ingoing power amplifier 30；In
When reflection signal is weaker, output restores signal to control circuit 20, so that control circuit 20 increases ingoing power amplifier 30
Radiofrequency signal, to be carried out while guaranteeing that radio circuit operates normally to devices such as the power amplifiers 30 in radio circuit
Reflection protection avoids reflection power excessive and damages circuit devcie.
Fig. 3 is combined on the basis of Fig. 2, above-mentioned detecting circuit 42 may include detector diode D, second resistance R2, the
Three resistance R3 and first capacitor C1.The anode of detector diode D is connect with the coupled end of directional coupler 41, detector diode D
Cathode by second resistance R2 with protection circuit 43 input terminal connect.Detector diode D can send out directional coupler 41
Reflection signal out is rectified, to obtain the d. c. voltage signal in reflection signal, and using d. c. voltage signal as reflection
The signal voltage of signal is sent to the input terminal of protection circuit 43.The cathode of detector diode D also respectively by first capacitor C1,
3rd resistor R3 ground connection, is filtered, to eliminate the noise of high-frequency signal with the d. c. voltage signal exported to detector diode D
Interference.
Further, above-mentioned detecting circuit 42 may also include the second capacitor C2.The input terminal of protection circuit 43 can pass through
Second capacitor C2 ground connection, to improve the safety of 42 operational process of detecting circuit.
In the above-described embodiments, control circuit 20 may include the 4th resistance R4, first diode D1, third capacitor C3 and
4th capacitor C4.The first end of 4th resistance R4 connect with the output end of protection circuit 43, the second end of the 4th resistance R4 and the
The anode connection of one diode D1, the cathode ground connection of first diode D1.The second end of 4th resistance R4 also passes through third respectively
Capacitor C3 connect with radiofrequency signal input interface 10 and is connect by the 4th capacitor C4 with the input terminal of power amplifier 30.It protects
The protection signal that protection circuit 43 exports is high level signal, and recovery signal is low level signal.Wherein, high level signal is greater than the
The conducting voltage of one diode, low level signal are less than the conducting voltage of first diode D1.Third capacitor C3 and the 4th capacitor
C4 can be filtered the direct current signal in the radio circuit, cause to avoid direct current noise signal to the transmission of radiofrequency signal
Interference.
When protecting circuit 43 to issue protection signal, to anode one bias voltage of addition of first diode D1, make first
Diode D1 conducting, the portion radio frequency signal in radiofrequency signal that RF signal input end mouth issues are flowed by first diode D1
Enter ground, so that the radiofrequency signal being input in power amplifier 30 reduces, power amplifier 30 is avoided to believe because of powerful reflection
Number and generate damage；Extensive time multiplexed signal is issued in protection circuit 43, the bias voltage of the anode of first diode D1 is lower than conducting
Voltage, first diode D1 cut-off, the radiofrequency signal that RF signal input end mouth issues will all be sent to power amplifier
In 30, so that the radiofrequency signal being input in power amplifier 30 increases, radio circuit is able to maintain normal operation at this time.It can be with
Understand, above-mentioned first diode D1 can be PIN diode.
Together referring to Fig. 2 and Fig. 3, in a preferred embodiment, above-mentioned protection circuit 43 may include the first operation amplifier
Device U1, the first electrode input end of the first operational amplifier U1 is connect with the second end of second resistance R2, to receive detecting circuit
42 signal voltages sent, the first negative input of the first operational amplifier U1 connect the first reference level, the first operation amplifier
The first output end of device U1 is connect with the controlled end of control circuit 20.First reference level is pre-set voltage threshold, electricity
Source voltage is grounded by two concatenated first divider resistance Ra and the second divider resistance Rb, and the first reference level is two points
Voltage on the series connection point of piezoresistance.First operational amplifier U1 will believe after receiving signal voltage and the first reference level
Number voltage is compared with the first reference level, when signal voltage is greater than the voltage value of the first reference level, indicates reflection letter
Number reflection power be higher than preset power threshold, at this time the first operational amplifier U1 the first output end export high level；In
Signal voltage less than the first reference level voltage value when, indicate reflection signal reflection power be lower than preset power threshold,
The first output end of the first operational amplifier U1 exports low level at this time.By that will reflect the corresponding signal voltage of signal and preset
Corresponding first reference level of power threshold is compared, and whether the power that can accurately determine reflection signal is more than default function
Rate threshold value, so that protection circuit 43 can issue the letter that corresponding signal control flows into the radiofrequency signal of power amplifier 30
Number power, to avoid power amplifier 30 flows through powerful reflection signal and is damaged.
Referring to Fig. 2 and Fig. 4, in the different another preferred embodiment of above preferred embodiment, above-mentioned protection circuit
43 can also include the first triode Q1, the first power supply VCC, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the tenth
One resistance R11.The first electrode input end of first operational amplifier U1 is connect with the second end of second resistance R2, to receive detection
The signal voltage that circuit 42 is sent, the first negative input of the first operational amplifier U1 connect the first reference level, the first operation
The first output end of amplifier U1 is connect by eleventh resistor R11 with the base stage of the first triode Q1.First reference level is
Pre-set voltage threshold, supply voltage are grounded by two concatenated first divider resistance Ra and the second divider resistance Rb,
First reference level is the voltage on the series connection point of two divider resistances.The first end of first power supply VCC and the 5th resistance R5
Connection.The second end of 5th resistance R5 is connect with the collector of the first triode Q1, the emitter ground connection of the first triode Q1.
It should be noted that the first output end of above-mentioned first operational amplifier U1 can also pass through eleventh resistor R11
It is connect with the base stage of the first triode Q1, and the first output end of the first operational amplifier U1 is grounded by the tenth resistance R10,
To improve the safety of protection circuit 43.Specifically, the first operational amplifier U1 can be LM158 type two-way operational amplifier.
First power supply VCC is also connect with the first end of the 6th resistance R6, the second end and the 7th resistance R7 of the 6th resistance R6
First end connection, the 7th resistance R7 second end ground connection.The of the second end of 6th resistance R6 and the first operational amplifier U1
Two electrode input ends connection, using the voltage of the 6th resistance R6 second end as the second reference level.First operational amplifier U1
The second negative input also connect with the collector of the first triode Q1, using the collector voltage of the first triode Q1 as
Protection detection voltage, the second output terminal of the first operational amplifier U1 are connect with the controlled end of control circuit 20.
Signal voltage can be compared by the first operational amplifier U1 with the first reference level, be greater than the in signal voltage
When one reference level, high level is exported to the base stage of the first triode Q1；When signal voltage is less than the first reference level, to
The base stage of one triode Q1 exports low level.
Protection detection voltage can also be compared by the first operational amplifier U1 with the second reference level, be detected in protection
When voltage is less than the second reference level, high level is exported to control circuit 20；It is greater than the second reference level in protection detection voltage
When, low level is exported to control circuit 20.
In the above-described embodiments, when the reflection power for reflecting signal is greater than predetermined power threshold value, corresponding signal voltage
Greater than the first reference level, the first output end of the first operational amplifier U1 exports high level to the base stage of the first triode Q1,
First triode Q1 conducting.Since the second reference level is constant, the collector voltage that protection detection voltage is the first triode Q1,
In the first triode Q1 conducting, the collector voltage of the first triode Q1 is reduced, so that protection detection voltage is lower than the
The second output terminal of two reference levels, the first operational amplifier U1 exports high level to control circuit 20.Similarly, believe in reflection
Number reflection power when being less than predetermined power threshold value, the first triode Q1 cut-off, the collector voltage on the first triode Q1 is high
In the second reference level, so that the second output terminal of the first operational amplifier U1 exports low level to control circuit 20.Pass through
Two comparison circuits in one operational amplifier U1 generate output to the protection signal of control circuit 20 or restore signal, can incite somebody to action
Detecting circuit 42 is effectively isolated with control circuit 20, so that the service life of reflection protection circuit 40 is promoted, enhancing reflection
The safety of protection.
It is understood that the second electrode input end of above-mentioned first operational amplifier U1 can also pass through the 8th capacitor C5
Ground connection, is filtered with the interference signal in the voltage signal to the second reference level.
It further, can also include the 8th resistance R8 and the 5th capacitor C5 in above-mentioned protection circuit 43.8th resistance R8
First end connect with the second end of the 5th resistance R5, the second end of the 8th resistance R8 ground connection, the first end of the 5th capacitor C5 with
The second end of 5th resistance R5 connects, the second end ground connection of the 5th capacitor C5.It is made up of the 8th resistance R8 and the 5th capacitor C5
RC filter circuit is filtered with the high frequency noise in the supply voltage that exports to the first power supply VCC, prevents noise signal from generating
Interference.
In the above-described embodiments, control circuit 20 can also include the 9th resistance R9, the 6th capacitor C6 and the 7th capacitor
C7.The second output terminal of first operational amplifier U1 is grounded by the 9th resistance R9, the second output of the first operational amplifier U1
End can also be grounded by the 6th capacitor C6 and the 7th capacitor C7 respectively.Since the second output terminal of the first operational amplifier U1 is logical
Crossing capacitor rear ground connection in parallel with a resistor may be constructed filter circuit, to be filtered to noise signal.Meanwhile passing through setting the 6th
Capacitor C6 and the 7th capacitor C7 can effectively eliminate the interference signal of the second output terminal of the first operational amplifier U1, so that biasing
Voltage is more stable.
It should be noted that above-mentioned 6th capacitor C6 and the 7th capacitor C7 can be in parallel by the capacitor of two different capacitances
Composition.For example, two shunt capacitances can be respectively set to microfarad range capacitor and pico farad grade capacitor, respectively to different types of
Noise is filtered.For example, the capacitance of two capacitors can be respectively 100pF and 0.1uF, to improve the biased electrical to output
The filter capacity of different type noise in pressure.
The present invention also provides a kind of radio frequency protector, which includes radio frequency protection circuit, which protects
The structure of protection circuit can refer to above-described embodiment, and details are not described herein.Naturally, since the radio frequency of the present embodiment protects dress
The technical solution for using above-mentioned radio frequency protection circuit is set, therefore the radio frequency protector has above-mentioned radio frequency protection circuit all
Beneficial effect.
The above is only alternative embodiments of the invention, are not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of radio frequency protects circuit characterized by comprising
The first end of control circuit, the control circuit is connect with radiofrequency signal input interface, is connect with receiving radiofrequency signal input
The radiofrequency signal that mouth issues；
Power amplifier, the input terminal of the power amplifier are connect with the second end of the control circuit；
The input terminal of reflection protection circuit, the reflection protection circuit is connect with the output end of the power amplifier, described anti-
Penetrate protection circuit output end connect with radiofrequency signal output interface, the control terminal of the reflection protection circuit also with the control
The controlled end of circuit connects；
Wherein, the reflection protection circuit is detected for the reflection signal to the radiofrequency signal, and according to the reflection
The signal voltage of signal persistently sends protection signal to the control circuit or restores signal；
The control circuit, for when receiving the protection signal, the radiofrequency signal after reduction to be exported to the power
Amplifier；The extensive time multiplexed signal is being received, radiofrequency signal is being exported to the power amplifier.
2. radio frequency as described in claim 1 protects circuit, which is characterized in that the reflection protection circuit includes directional couple
Device, detecting circuit, protection circuit；
The input terminal of the directional coupler is connect with the output end of the power amplifier, the straight-through end of the directional coupler
It is connect with radiofrequency signal output interface, the coupled end of the directional coupler is connect with the input terminal of the detecting circuit；It is described
The output end of detecting circuit is connect with the input terminal of the protection circuit, the output end of the protection circuit and the control circuit
Controlled end connection；
Wherein, the directional coupler, the reflection signal for will be coupled according to the radiofrequency signal are sent to the inspection
Wave circuit；
The detecting circuit, for being detected the reflection signal to obtain the signal voltage of the reflection signal, and will
The signal voltage is sent to the protection circuit；
The protection circuit, for exporting corresponding signal or the protection signal of restoring to the control electricity according to the signal voltage
Road.
3. radio frequency as claimed in claim 2 protects circuit, which is characterized in that the detecting circuit includes detector diode, the
Two resistance, 3rd resistor and first capacitor；
The anode of the detector diode is connect with the coupled end of the directional coupler, and the cathode of the detector diode passes through
The second resistance is connect with the input terminal of the protection circuit, and the cathode of the detector diode is connect by the first capacitor
Ground, the cathode of the detector diode are also grounded by the 3rd resistor.
4. radio frequency as claimed in claim 3 protects circuit, which is characterized in that the detecting circuit further includes the second capacitor；Institute
The input terminal for stating protection circuit also passes through second capacity earth.
5. radio frequency as claimed in claim 4 protects circuit, which is characterized in that the control circuit includes the 4th resistance, first
Diode, third capacitor and the 4th capacitor, the first end of the 4th resistance is connect with the output end of the protection circuit, described
The second end of 4th resistance is connect with the anode of the first diode, the cathode ground connection of the first diode；Described 4th
The second end of resistance is also connect by third capacitor with radiofrequency signal input interface respectively, is put by the 4th capacitor with the power
The input terminal connection of big device.
6. radio frequency as claimed in claim 5 protects circuit, which is characterized in that the protection circuit includes the first operation amplifier
First electrode input end of device, first operational amplifier is connect with the second end of the second resistance, to receive the inspection
The signal voltage that wave circuit is sent, the first negative input of first operational amplifier connect the first reference level, and described the
First output end of one operational amplifier is connect with the controlled end of the control circuit；
Wherein, first operational amplifier, for the signal voltage to be compared with first reference level, in institute
When stating signal voltage greater than first reference level, Xiang Suoshu control circuit exports high level；It is less than in the signal voltage
When first reference level, Xiang Suoshu control circuit exports low level.
7. radio frequency as claimed in claim 6 protects circuit, which is characterized in that the protection circuit further include the first triode,
First power supply, the 5th resistance, the 6th resistance, the 7th resistance and eleventh resistor；
First output end of first operational amplifier is connected by the eleventh resistor and the base stage of first triode
It connects；First power supply is connect with the first end of the 5th resistance, the second end of the 5th resistance and the one or three pole
The collector of pipe connects, the emitter ground connection of first triode；
First power supply is also connect with the first end of the 6th resistance, the second end of the 6th resistance and the 7th electricity
The first end of resistance connects, and the second end ground connection of the 7th resistance, second end and first operation of the 6th resistance is put
The second electrode input end connection of big device, it is described using the voltage of the second end of the 6th resistance as the second reference level
Second negative input of the first operational amplifier is connect with the collector of first triode, by first triode
Collector voltage as protection detection voltage, the second output terminal of first operational amplifier and the control circuit by
Control end connection；
Wherein, first operational amplifier, for the signal voltage to be compared with first reference level, in institute
When stating signal voltage greater than first reference level, the base stage of the first triode of Xiang Suoshu exports high level；In the signal
When voltage is less than first reference level, the base stage of the first triode of Xiang Suoshu exports low level.
First operational amplifier is also used to for protection detection voltage being compared with second reference level, In
When the protection detection voltage is less than second reference level, Xiang Suoshu control circuit exports high level；It is examined in the protection
When surveying voltage greater than second reference level, Xiang Suoshu control circuit exports low level.
8. radio frequency as claimed in claim 7 protects circuit, which is characterized in that the protection circuit further includes the 8th resistance and the
Five capacitors；The first end of 8th resistance is connect with the second end of the 5th resistance, the second termination of the 8th resistance
The first end on ground, the 5th capacitor is connect with the second end of the 5th resistance, the second end ground connection of the 5th capacitor.
9. radio frequency as described in any one of claim 5-8 protects circuit, which is characterized in that the control circuit further includes the
The second output terminal of nine resistance, the 6th capacitor and the 7th capacitor, first operational amplifier passes through the 9th resistance eutral grounding,
The second output terminal of first operational amplifier also passes through the 6th capacitor and the 7th capacity earth respectively.
10. a kind of radio frequency protector, which is characterized in that the radio frequency protector includes radio frequency protection circuit, the radio frequency
Protection circuit is configured as such as the described in any item radio frequency protection circuits of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834707.5A CN110492854A (en) | 2019-09-02 | 2019-09-02 | Radio frequency protects circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834707.5A CN110492854A (en) | 2019-09-02 | 2019-09-02 | Radio frequency protects circuit and device |
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| CN110492854A true CN110492854A (en) | 2019-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910834707.5A Pending CN110492854A (en) | 2019-09-02 | 2019-09-02 | Radio frequency protects circuit and device |
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| CN (1) | CN110492854A (en) |
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| CN111049483A (en) * | 2019-11-29 | 2020-04-21 | 中国电子科技集团公司第十三研究所 | Radio frequency detection circuit and radio frequency device |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
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