CN207559951U - A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit - Google Patents
A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit Download PDFInfo
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- CN207559951U CN207559951U CN201721381639.4U CN201721381639U CN207559951U CN 207559951 U CN207559951 U CN 207559951U CN 201721381639 U CN201721381639 U CN 201721381639U CN 207559951 U CN207559951 U CN 207559951U
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Abstract
The utility model is related to a kind of millimeter wave fast-pulses to reflect excessive real-time protection circuit.The protection circuit includes dual directional coupler, coaxial attenuator, wave detector, operational amplification circuit, voltage comparator circuit and fault latch circuit.The dual directional coupler, positive input connect radio-frequency input signals, forward direction output termination radio frequency output, forward direction coupling termination power-sensing circuit, the input terminal of reverse coupled terminated coaxial attenuator.The input terminal of the output termination wave detector of the coaxial attenuator.The input terminal of the output termination operational amplification circuit of the wave detector.The input terminal of the output termination voltage comparator circuit of the operational amplification circuit.The input terminal of the output termination fault latch circuit of the voltage comparator circuit.The utility model can solve the deficiencies in the prior art, and when power amplifier output terminal reflection signal is excessive, real-time guard is carried out to power amplification system.
Description
Technical field
The utility model is related to power amplification system technical fields, and in particular to a kind of millimeter wave fast-pulse reflection is excessive in real time
Protect circuit.
Background technology
In microwave system, in the actual circuit application of power amplifier of the output power more than 2W, since load is opened
Road, short circuit or mismatch, power amplifier output port are presented higher reflection signal distributions, prevent RF energy from effectively transmitting
It goes out, most of energy is converted into thermal energy, causes heat accumulation, and this aspect reduces power amplification efficiency, on the other hand, will cause work(
Heat release is burnt.Therefore, it is necessary to the reflection excessive protection of signal is carried out to power amplification system.The existing excessive protection circuit of back wave is main
It is that the reflection excessive protection of signal is carried out by " forward and reverse detection+voltage amplification is compared with delay+positive counter voltage ", when reversed electricity
More than after certain value, starting protection, this protected mode has the following disadvantages the ratio of pressure and forward voltage：First, traditional detection
The rise and fall edge of module is slower, is not suitable for burst pulse；2nd, the delay circuit of traditional detection module can cause to be not suitable with pulse letter
Number or variable duty cycle pulse signal；3rd, component needed for traditional analog detection protection circuit is more, and cost is higher, response
Time is longer.
Utility model content
The purpose of this utility model is to provide a kind of millimeter wave fast-pulses to reflect excessive real-time protection circuit, to solve
When power amplifier output terminal reflection signal is excessive, real-time guard is carried out to power amplification system for the deficiencies in the prior art.
To achieve the above object, the utility model employs following technical scheme：
A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit, including dual directional coupler, coaxial attenuator, inspection
Wave device, operational amplification circuit, voltage comparator circuit and fault latch circuit.
The dual directional coupler, positive input connect radio-frequency input signals, and forward direction output termination radio frequency exports,
Forward direction coupling termination power-sensing circuit, the input terminal of reverse coupled terminated coaxial attenuator.The coaxial attenuator it is defeated
Go out to terminate the input terminal of wave detector；The input terminal of the output termination operational amplification circuit of the wave detector；The operation amplifier electricity
The input terminal of the output termination voltage comparator circuit on road；The input of the output termination fault latch circuit of the voltage comparator circuit
End.
Further, the filter circuit being arranged between wave detector and operational amplification circuit, the filter circuit are further included
Including resistance R1, resistance R4, capacitance C3 and clamp diode V1；The anode of the clamp diode V1 connects wave detector through resistance R1
Output terminal, minus earth；After the resistance R4 is in parallel with capacitance C3, one end is connected with the anode of clamp diode V1, another
End ground connection.
Further, the operational amplification circuit includes operational amplifier N1, resistance R2, resistance R3 and resistance R5；It is described
Operational amplifier N1, inverting input connect the anode of clamp diode V1 through resistance R2, anti-phase input terminating resistor R5's
One end, in-phase input end are grounded through resistance R3；After the other end of the resistance R5 is connected with the output terminal of operational amplifier N1
Output terminal as operational amplification circuit；The operational amplifier uses the ultrahigh speed operational amplifier of model LM7171.
Further, the voltage comparator circuit include voltage comparator N2, resistance R6, adjustable resistance RP1, capacitance C4,
Capacitance C7 and capacitance C8；The voltage comparator N2, homophase input terminate the output terminal of operational amplification circuit, anti-phase input
The adjustable side for meeting adjustable resistance RP1 respectively, one end of capacitance C7 are held, output terminal connects power supply through resistance R6, and output terminal also passes through
Capacitance C8 is grounded, and output terminal is also as the output terminal of voltage comparator circuit；The capacitance C4 is connected in parallel on the two of adjustable resistance RP1
End, a termination power of adjustable resistance RP1, other end ground connection；The other end ground connection of the capacitance C7；The voltage comparator N2
Model LM311P.
Further, the fault latch circuit includes latch N3, resistance R7 and light emitting diode V2；The latch
The output terminal of model CD40BB, S the termination voltage comparison circuit of N3, R termination reset signals, output terminal is through resistance R7
The anode of sending and receiving optical diode V2；The minus earth of the light emitting diode V2.
Compared to the prior art, the beneficial effects of the utility model are：
（1）The utility model uses the dual directional coupler of millimeter wave, and incoming signal and reflection signal are isolated, and coupling is defeated
Outlet is also completely isolated, reduces signal interference, decreases the quantity of microwave device, reduces cost.
（2）The LM7171 ultrahigh speed operational amplifiers that the utility model uses, are to have the characteristics that ultrahigh speed, High Output Current
Voltage feed-back amplifier, can minimum detection go out the pulse signal of 0.2 μ s.
（3）The flexible voltage comparators of LM311P high that the utility model uses, the response time, can be real-time up to 200ns
Detectable voltage signals, corresponding time are shorter.
（4）Protection circuit described in the utility model uses the design philosophy for first decaying and amplifying afterwards, is keeping signal characteristic
On the basis of effectively inhibit noise signal in reflection signal, and reduce the usage quantity of switching diode, reduce because
Influence of the parasitic capacitance that multiple switch Diode series generate to signal condition system bandwidth.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the circuit diagram of filter circuit, operational amplifier, voltage comparator and fault latch circuit；
Fig. 3 is the operation principle schematic diagram of dual directional coupler.
Wherein：
1st, dual directional coupler, 2, coaxial attenuator, 3, wave detector, 4, operational amplification circuit, 5, voltage comparator circuit, 6,
Fault latch circuit, 7, filter circuit.
Specific embodiment
The utility model is described further below in conjunction with the accompanying drawings：
A kind of millimeter wave fast-pulse as Figure 1-Figure 2 reflects excessive real-time protection circuit, is coupled including amphiorentation
Device 1, coaxial attenuator 2, wave detector 3, operational amplification circuit 4, voltage comparator circuit 5 and fault latch circuit 6.
The dual directional coupler 1, positive input connect radio-frequency input signals, and forward direction output termination radio frequency exports,
Its forward direction coupling termination power-sensing circuit, the input terminal of reverse coupled terminated coaxial attenuator.The output of the wave detector 3
Terminate the input terminal of operational amplification circuit 4.The input terminal of the output termination voltage comparator circuit 5 of the operational amplification circuit 4.Institute
State the input terminal of the output termination fault latch circuit 6 of voltage comparator circuit 5.
Further, the operational amplification circuit 4 includes operational amplifier N1, resistance R2, resistance R3 and resistance R5.It is described
Operational amplifier N1, inverting input connect the anode of clamp diode V1 through resistance R2, anti-phase input terminating resistor R5's
One end, normal phase input end are grounded through resistance R3；After the other end of the resistance R5 is connected with the output terminal of operational amplifier N1
Output terminal as operational amplification circuit.The operational amplifier N1 uses the ultrahigh speed operational amplifier of model LM7171.
The bandwidth for the operational amplifier LM7171 that the utility model uses is up to 200MHz, and output current is up to 100mA, and the height of 85dB is opened
Ring gain, conversion rate are up to 4100V/ μ s, and processing can be quickly amplified to signal.Resistance R2, R3 and R5 composition electricity
Large scale circuit is pressed, adjusts appropriate ratio value, makes the voltage signal of amplification in range of needs.It is put through operational amplification circuit
The in-phase input end of voltage signal access voltage comparator after big.
Further, the filter circuit 7 being arranged between wave detector 3 and operational amplification circuit 4 is further included.The filtered electrical
Road 7 includes resistance R1, resistance R4, capacitance C3 and clamp diode V1.The anode of the clamp diode V1 connects inspection through resistance R1
The output terminal of wave device, minus earth.After the resistance R4 is in parallel with capacitance C3, one end is connected with the anode of clamp diode V1,
The other end is grounded.The filter circuit 7, for removing the very high frequency(VHF) signal in signal and some noise signals.Work as voltage signal
When excessive, ground connection can be directly connected in clamp diode V1, prevent from burning circuit chip.
Further, the voltage comparator circuit 5 include voltage comparator N2, resistance R6, adjustable resistance RP1, capacitance C4,
Capacitance C7 and capacitance C8.The voltage comparator N2, homophase input terminate the output terminal of operational amplification circuit, anti-phase input
The adjustable side for meeting adjustable resistance RP1 respectively, one end of capacitance C7 are held, output terminal connects power supply through resistance R6, and output terminal also passes through
Capacitance C8 is grounded, and output terminal is also as the output terminal of voltage comparator circuit；The capacitance C4 is connected in parallel on the two of adjustable resistance RP1
End, a termination power of adjustable resistance RP1, other end ground connection；The other end ground connection of the capacitance C7.The voltage comparator N2
Model LM311P.The response time for the voltage comparator LM311P that the utility model uses up to 200ns, can be detected in real time
Over-pressed signal quickly carries out fault latch, timely feedbacks to controller.Overall applicability in microwave system predefines
Go out the guard interval of back wave, adjust the voltage reference reference value in voltage comparator circuit.If it is excessive to reflect signal, sample
Voltage level is more than reference voltage, and voltage comparator exports high level to the S ends of latch.
Further, the fault latch circuit includes latch N3, resistance R7 and light emitting diode V2.The latch
The output terminal of model CD40BB, S the termination voltage comparison circuit of N3, R termination reset signals, output terminal is through resistance R7
The anode of sending and receiving optical diode V2；The minus earth of the light emitting diode V2.The reset signal of latch N3 has for high level
Effect, when the S ends of latch N3 are high level, and R ends are low level, output terminal is high level, at this point, light emitting diode V2 points
It is bright, carry out the reflection excessive alarm of signal.
The guard method of above-mentioned protection circuit includes the following steps：
（1）Radiofrequency signal is exported by the positive output terminal of dual directional coupler to rf load, dual directional coupler
Positive coupled end connects power-sensing circuit, and power-sensing circuit is detected the watt level of output signal；Work as amphiorentation
When the positive output terminal of coupler has reflection signal, reflection signal is input to after the reverse coupled end of dual directional coupler is decayed
Coaxial attenuator.
（2）Coaxial attenuator decays to the reflection signal that dual directional coupler reverse coupled end exports in adjustable extent.
（3）Reflection signal after coaxial attenuator is decayed after detector demodulates, forms detectable negative pulse
Signal.
（4）Filter circuit is for removing through the very high frequency(VHF) signal and noise signal in wave detector treated signal.
（5）Signal after filtered processing of circuit is entered in operational amplification circuit, and operational amplification circuit is to the signal
It is amplified, amplified signal enters voltage comparator circuit.
（6）The signal and the reference voltage of voltage comparator that voltage comparator circuit exports operational amplification circuit compare
Compared with when the voltage level of the signal is more than reference voltage, the output terminal of voltage comparator exports high level to fault latch
S ends.
（7）When the S ends of the latch in fault latch circuit are high level, and R ends are low level, the output terminal of latch
For high level, light emitting diode is lighted, and is alarmed.
What the utility model detected is the reflection signal of millimeter wave, and frequency uses amphiorentation to couple in more than 30GHz
Device, isolation is high, and up to 30dB, stability is good, and couples or shunt with directionality, is suitble to the isolation of high frequency reflection signal
Detection.The operation principle schematic diagram of dual directional coupler is as shown in figure 3, wherein, A and B ends are main line end, when signal is defeated from A ends
Fashionable, coupled signal is exported from C-terminal, and D ends do not export；When signal is inputted from B ends, coupled signal is exported from D ends, and C-terminal does not have
There is output.
The operation principle of the utility model：
According to the overall applicability of microwave system, the guard interval of back wave is predefined out, adjusts voltage comparator circuit
In reference voltage reference value.When the reflection signal of sampling is after detection, filtering process, put with LM7171 ultrahigh speed operations
Big device, the quick pulse signal amplification for realizing 0.2 μ s of minimum, and pass through the voltage comparator monitored in real time, the benchmark with setting
Voltage threshold is compared, and is latched using fault latch fast failure.After system monitoring is to fault-signal, turn off in time
Power amplification system plays the role of protecting power amplification system.
In conclusion the utility model can be quick to realize pulsewidth 200ns's when power amplifier output terminal reflection signal is excessive
The excessive defencive function of signal is reflected, stops power amplification system work in time, and pass through the light emitting diode in fault latch circuit
As indicator light alarm, duty personnel is reminded to be investigated in time, ensure that power amplification system restores to work normally in time.
Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality
Novel range is defined, and under the premise of the spirit of the design of the utility model is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In the range of.
Claims (5)
1. a kind of millimeter wave fast-pulse reflects excessive real-time protection circuit, it is characterised in that：Including dual directional coupler, coaxially
Attenuator, wave detector, operational amplification circuit, voltage comparator circuit and fault latch circuit；
The dual directional coupler, positive input connect radio-frequency input signals, and forward direction output termination radio frequency output is positive
Coupling termination power-sensing circuit, the input terminal of reverse coupled terminated coaxial attenuator；The output terminal of the coaxial attenuator
Connect the input terminal of wave detector；The input terminal of the output termination operational amplification circuit of the wave detector；The operational amplification circuit
The input terminal of output termination voltage comparator circuit；The input terminal of the output termination fault latch circuit of the voltage comparator circuit.
2. a kind of millimeter wave fast-pulse according to claim 1 reflects excessive real-time protection circuit, it is characterised in that：Also
Including the filter circuit being arranged between wave detector and operational amplification circuit, the filter circuit includes resistance R1, resistance R4, electricity
Hold C3 and clamp diode V1；The anode of the clamp diode V1 connects the output terminal of wave detector, minus earth through resistance R1；Institute
State resistance R4 it is in parallel with capacitance C3 after, one end is connected with the anode of clamp diode V1, the other end ground connection.
3. a kind of millimeter wave fast-pulse according to claim 2 reflects excessive real-time protection circuit, it is characterised in that：Institute
It states operational amplification circuit and includes operational amplifier N1, resistance R2, resistance R3 and resistance R5；The operational amplifier N1, reverse phase
Input terminal connects the anode of clamp diode V1, one end of anti-phase input terminating resistor R5, normal phase input end warp through resistance R2
Resistance R3 is grounded；The other end of the resistance R5 be connected with the output terminal of operational amplifier N1 after as the defeated of operational amplification circuit
Outlet；The operational amplifier uses the ultrahigh speed operational amplifier of model LM7171.
4. a kind of millimeter wave fast-pulse according to claim 3 reflects excessive real-time protection circuit, it is characterised in that：Institute
It states voltage comparator circuit and includes voltage comparator N2, resistance R6, adjustable resistance RP1, capacitance C4, capacitance C7 and capacitance C8；It is described
Voltage comparator N2, homophase input terminate the output terminal of operational amplification circuit, and inverting input meets adjustable resistance RP1 respectively
Adjustable side, capacitance C7 one end, output terminal connects power supply through resistance R6, and output terminal is also grounded through capacitance C8, output terminal
Also as the output terminal of voltage comparator circuit；The capacitance C4 is connected in parallel on the both ends of adjustable resistance RP1, and the one of adjustable resistance RP1
Termination power, other end ground connection；The other end ground connection of the capacitance C7；The model LM311P of the voltage comparator N2.
5. a kind of millimeter wave fast-pulse according to claim 4 reflects excessive real-time protection circuit, it is characterised in that：Institute
It states fault latch circuit and includes latch N3, resistance R7 and light emitting diode V2；The model CD40BB of the latch N3,
The output terminal of S termination voltage comparison circuits, R termination reset signals, sun of the output terminal through resistance R7 sending and receiving optical diodes V2
Pole；The minus earth of the light emitting diode V2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381639.4U CN207559951U (en) | 2017-10-24 | 2017-10-24 | A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381639.4U CN207559951U (en) | 2017-10-24 | 2017-10-24 | A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207559951U true CN207559951U (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721381639.4U Expired - Fee Related CN207559951U (en) | 2017-10-24 | 2017-10-24 | A kind of millimeter wave fast-pulse reflects excessive real-time protection circuit |
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| Country | Link |
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| CN (1) | CN207559951U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681984A (en) * | 2017-10-24 | 2018-02-09 | 合肥雷科电子科技有限公司 | A kind of millimeter wave fast pulse reflects excessive real-time protection circuit and its guard method |
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
-
2017
- 2017-10-24 CN CN201721381639.4U patent/CN207559951U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681984A (en) * | 2017-10-24 | 2018-02-09 | 合肥雷科电子科技有限公司 | A kind of millimeter wave fast pulse reflects excessive real-time protection circuit and its guard method |
| CN107681984B (en) * | 2017-10-24 | 2024-04-05 | 合肥雷科电子科技有限公司 | Millimeter wave fast pulse reflection excessive real-time protection circuit and protection method thereof |
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN113777595B (en) * | 2021-09-14 | 2023-08-11 | 天津理工大学 | Ultrasonic wave receiving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 Termination date: 20191024 |