CN205142141U - Radio frequency microwave power amplifier's standing wave protection device - Google Patents
Radio frequency microwave power amplifier's standing wave protection device Download PDFInfo
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- CN205142141U CN205142141U CN201520884453.5U CN201520884453U CN205142141U CN 205142141 U CN205142141 U CN 205142141U CN 201520884453 U CN201520884453 U CN 201520884453U CN 205142141 U CN205142141 U CN 205142141U
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Abstract
The utility model provides a radio frequency microwave power amplifier's standing wave protection device, include: backward power interconnected circuit, broadband detection voltage balancing circuit, detection voltage amplifier circuit, control voltage generating circuit, power control circuit and power amplifier, backward power interconnected circuit is connected to detection voltage amplifier circuit through broadband detection voltage balancing circuit, detection voltage amplifier circuit is connected to power control circuit through control voltage generating circuit, power amplifier with power control circuit is connected and adjusts its output according to power control circuit, power amplifier with the backward power interconnected circuit be connected. The utility model discloses the power amplifier output also can protect it not receive the damage under connecting abnormal conditions to, do not close this power amplifier in protection power amplifier, power amplifier still keeps power output.
Description
Technical field
The utility model relates to a kind of vswr protection device, particularly relates to a kind of at the vswr protection device of output without the frequency microwave power amplifier of isolator.
Background technology
Existing frequency microwave wideband power amplifier needs to arrange vswr protection, and especially power amplifier exports without isolator, becomes large at power amplifier output standing wave, causes power amplifier work unstable; Namely frequency microwave power amplifier is at output without in isolator situation, once open circuit short circuit occurs output and standing wave is deteriorated, will cause power amplifier self-oscillation, produce very large from excited power, may burn frequency microwave power amplifier instantaneously.
Summary of the invention
Technical problem to be solved in the utility model needs to provide a kind of device that can realize carrying out without the frequency microwave power amplifier of isolator output vswr protection; and under guard mode, frequency microwave power amplifier still keeps the power stage compared with low signal.
To this, the utility model provides a kind of vswr protection device of frequency microwave power amplifier, comprise: backward power coupling circuit, broadband detecting circuit equalizing circuit, detecting circuit amplifying circuit, control voltage generative circuit, power control circuit and power amplifier, described backward power coupling circuit is connected to detecting circuit amplifying circuit by broadband detecting circuit equalizing circuit, described detecting circuit amplifying circuit is connected to power control circuit by control voltage generative circuit, described power amplifier is connected with described power control circuit and adjusts its power output according to power control circuit, described power amplifier is connected with described backward power coupling circuit.
Further improvement of the utility model is, described control voltage generative circuit is provided with comparator, and described detecting circuit amplifying circuit is connected with the input of described comparator, and the output of described comparator is connected with described power control circuit.
Further improvement of the utility model is, described backward power coupling circuit comprises electric capacity C1, electric capacity C3 and resistance R2, one end ground connection of described electric capacity C1, the other end of described electric capacity C1 is connected with one end of described electric capacity C3, and the other end of described electric capacity C3 is connected with outside radio circuit output; One end ground connection of described resistance R2, the other end of described resistance R2 is connected with the input of described broadband detecting circuit equalizing circuit.
Further improvement of the utility model is, described broadband detecting circuit equalizing circuit comprises RF power sensing circuit and voltage balance circuit, and described backward power coupling circuit is connected to described voltage balance circuit by RF power sensing circuit.
Further improvement of the utility model is, described RF power sensing circuit comprises resistance R13, resistance R14, electric capacity C3, resistance R32, electric capacity C53, resistance R33, electric capacity C51, resistance R56, electric capacity C58, resistance R48, resistance R99, electric capacity C375, resistance R84, electric capacity C74, resistance R85, electric capacity C12, resistance R88, electric capacity C69, electric capacity C151 and radio frequency power detector U65; The other end of described resistance R2 is connected with one end of resistance R13, the other end of described resistance R13 is connected with one end of one end of described resistance R14, one end of electric capacity C3 and resistance R32 respectively, and the other end of described resistance R32 is by described electric capacity C53 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R33 with the other end of electric capacity C3, and the other end of described resistance R33 is by electric capacity C51 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R56 with the other end of electric capacity C3, and the other end of described resistance R56 is by electric capacity C58 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R48 with the other end of electric capacity C3, the other end of described resistance R48 is connected with one end of one end of described resistance R99, one end of resistance R84, one end of resistance R85 and electric capacity C12 respectively, the other end of described resistance R99 is by electric capacity C375 ground connection, the other end of described resistance R84 is by electric capacity C74 ground connection, the other end of described resistance R85 is connected with one end of described resistance R88 respectively with the other end of electric capacity C12, the other end ground connection of described resistance R88; The other end of described resistance R85 is connected with one end of described electric capacity C151 respectively with the other end of electric capacity C12, and the other end of described electric capacity C151 is connected with the INHI pin of described radio frequency power detector U65.
Further improvement of the utility model is, described voltage balance circuit comprises electric capacity C184, electric capacity C189, resistance R105, electric capacity C104, electric capacity C174, electric capacity C179, electric capacity C180, electric capacity C190, resistance R106, electric capacity C302, diode D9, resistance R107 and resistance R100, the VPOS pin of described radio frequency power detector U65 respectively with one end of electric capacity C184, one end of electric capacity C189 is connected with one end of resistance R105, the other end of described electric capacity C184 and the other end of electric capacity C189 ground connection respectively, the other end of described resistance R105 respectively with one end of electric capacity C104, one end of electric capacity C174, one end of electric capacity C179, one end of electric capacity C180, one end of electric capacity C190 is connected with 5V power supply, the other end of described electric capacity C104, the other end of electric capacity C174, the other end of electric capacity C179, the other end of electric capacity C180 and the other end of electric capacity C190 ground connection respectively, the VOUT pin of described radio frequency power detector U65 is connected with one end of resistance R106, the other end of described resistance R106 is connected with one end of resistance R107 with one end of described electric capacity C302, the anode of diode D9 respectively, the other end of described electric capacity C302 is connected with one end of described resistance R100, and the other end ground connection of described electric capacity C302, the negative electrode of described diode D9, the other end of resistance R107 are connected with the input of described detecting circuit amplifying circuit respectively with the other end of resistance R100.
Further improvement of the utility model is, described detecting circuit amplifying circuit comprises resistance R179, resistance R62 and operational amplifier U1, the output of described broadband detecting circuit equalizing circuit is connected to the in-phase input end of operational amplifier U1, one end ground connection of described resistance R179, the other end of described resistance R179 is connected with one end of resistance R62 with the inverting input of described operational amplifier U1 respectively, and the other end of described resistance R62 is connected with the output of described operational amplifier U1.
Further improvement of the utility model is, described control voltage generative circuit comprises resistance R184, resistance R187, electric capacity C89, operational amplifier U2, electric capacity C87, resistance R183, electric capacity C88 and diode D5; The output of described operational amplifier U1 is connected to the in-phase input end of described operational amplifier U2 by resistance R184, one end of described electric capacity C87 is connected with the in-phase input end of described operational amplifier U2, and the other end of described electric capacity C87 is connected with the output of described operational amplifier U2; One end of described resistance R187 is connected with external adjustable resistance with one end of electric capacity C89 respectively, the other end ground connection of described electric capacity C89, and the other end of described resistance R187 is connected with the inverting input of described operational amplifier U2; The output of described operational amplifier U2 is connected with the anode of diode D5 with one end of described electric capacity C88 respectively by resistance R183, the other end ground connection of described electric capacity C88, and the negative electrode of described diode D5 is connected to the input of described power control circuit.
Further improvement of the utility model is, described power control circuit comprises electric capacity C57, resistance R50, resistance R44, triode Q2, electric capacity C59, resistance R45, resistance R46, adjustable resistance VR10 and resistance R40, the negative electrode of described diode D5 is connected with one end of resistance R50 with one end of electric capacity C57 respectively, the other end of described resistance R50 is connected with the base stage of described triode Q2, the other end ground connection of described electric capacity C57; One end of described resistance R44 is connected with the base stage of described triode Q2, the other end ground connection of described resistance R44; One end of described electric capacity C59 is connected with the collector electrode of described triode Q2, the emitter of described triode Q2 and the other end of electric capacity C59 ground connection respectively; The collector electrode of described triode Q2 is connected with a stator pin of adjustable resistance VR10 with one end of described resistance R45 respectively, the other end of described resistance R45 is connected with one end of resistance R46 with another stator pin of described adjustable resistance VR10 respectively, the other end ground connection of described resistance R46; The moving plate pin of described adjustable resistance VR10 is connected to described power amplifier by resistance R40.
Further improvement of the utility model is, described power control circuit also comprises resistance R49, resistance R43, triode Q1, electric capacity C49, electric capacity C90, electric capacity C91, resistance R42, resistance R41, resistance R47 and electric capacity C54; One end of described resistance R49 is connected with the base stage of described triode Q1 respectively with one end of resistance R43, the other end ground connection of described resistance R49, the grounded emitter of described triode Q1, the other end of described resistance R43 is connected with the collector electrode of described triode Q1; The collector electrode of described triode Q1 is connected with one end of resistance R41 with one end of electric capacity C49, one end of electric capacity C90, one end of electric capacity C91, one end of resistance R42 respectively, the other end ground connection respectively of the other end of described electric capacity C49, the other end of electric capacity C90 and electric capacity C91; The other end of described resistance R42 is connected with one end of electric capacity C54 with one end of described resistance R47 respectively, the other end ground connection of described electric capacity C54, the other end of described resistance R47 is connected with the collector electrode of triode Q2, and the other end of described resistance R41 is connected with described power amplifier.
Compared with prior art; the beneficial effects of the utility model are: propose vswr protection device targetedly for the frequency microwave power amplifier without isolator; under described power amplifier output connects abnormal conditions, it also can be protected not to be damaged; and; this power amplifier is not closed while protection power amplifier; power amplifier still keeps power stage; mobile communication system can be more applicable for; particularly television broadcasting system; under transmitting antenna open circuit situation, whole system still can work on, and ensureing transmits does not interrupt.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of embodiment of the utility model;
Fig. 2 is the circuit theory diagrams of the backward power coupling circuit of a kind of embodiment of the utility model;
Fig. 3 is the circuit theory diagrams of the broadband detecting circuit equalizing circuit of a kind of embodiment of the utility model;
Fig. 4 is the detecting circuit amplifying circuit of a kind of embodiment of the utility model and the circuit theory diagrams of control voltage generative circuit;
Fig. 5 is the circuit theory diagrams of the power control circuit of a kind of embodiment of the utility model;
Fig. 6 is the circuit theory diagrams of the power amplifier of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present utility model is described in further detail.
As shown in Figure 1, this example provides a kind of vswr protection device of frequency microwave power amplifier 6, comprise: backward power coupling circuit 1, broadband detecting circuit equalizing circuit 2, detecting circuit amplifying circuit 3, control voltage generative circuit 4, power control circuit 5 and power amplifier 6, described backward power coupling circuit 1 is connected to detecting circuit amplifying circuit 3 by broadband detecting circuit equalizing circuit 2, described detecting circuit amplifying circuit 3 is connected to power control circuit 5 by control voltage generative circuit 4, described power amplifier 6 is connected with described power control circuit 5 and adjusts its power output according to power control circuit 5, described power amplifier 6 is connected with described backward power coupling circuit 1.
Wherein, Fig. 1 is this routine system architecture diagram.Described backward power coupling circuit 1, the reflected signal that can embody load standing wave is given next stage and is carried out power detection, requires the degree of coupling and directivity, so that accurate detection of reflected power, for judging amplifier load standing wave, its circuit theory diagrams as shown in Figure 2.Described broadband detecting circuit equalizing circuit 2 is for ensureing the detecting circuit consistency of different frequent points, and object is the amplitude equalization to different frequency, exports same detecting circuit under ensureing equal-wattage; Namely under different frequency equal-wattage, export identical voltage, its circuit theory diagrams as shown in Figure 3.Described detecting circuit amplifying circuit 3 comprises voltage amplification comparison circuit, is completed, amplified by detecting circuit by high speed operation amplifier, then with setup control voltage compare, produce power control voltage; Described detecting circuit amplifying circuit 3 is for adjusting multiplication factor according to detecting circuit size, and to obtain sizeable detecting circuit, its circuit theory diagrams as shown in Figure 4.Described control voltage generative circuit 4, when reflection power increases to setting thresholding, comparison circuit starts output voltage, go to control power control circuit 5, to reduce power output, ensure that reflection power is not more than the reflection power thresholding of setting, its circuit theory diagrams as shown in Figure 4.Described power control circuit 5 is according to the linear requirements to power amplifier 6; the grid voltage of final power amplifier tube can be controlled; its circuit theory diagrams as shown in Figure 5; its power output is adjusted according to the voltage swing of power control circuit 5; be applied to described backward power coupling circuit 1, make whole described vswr protection device maintain a dynamic balance state, and under guard mode; power amplifier 6 still keeps a comparatively low signal power output, meaning of the present invention that Here it is.Described power amplifier 6 is the final power amplifier of frequency microwave power amplifier, and its circuit theory diagrams as shown in Figure 6.
This example is when the final power amplifier tube output open circuit no-self excitation of described power amplifier 6, also the input power of this final power amplifier tube can only be controlled, its defencive function comprises two aspects: one, the signal power that restriction reflexes to power amplifier 6 is not more than set point, protection frequency microwave power amplifier tube; Two, abnormal at load impedance, once it is unstable that power amplifier tube occurs, control rapidly power tube grid voltage by reflected voltage, protection power amplifier 6 does not damage.
This example proposes vswr protection device targetedly for the frequency microwave power amplifier 6 without isolator; under described power amplifier 6 output connects abnormal conditions, it also can be protected not to be damaged; and; this power amplifier 6 is not closed while protection power amplifier 6; power amplifier 6 still keeps power stage; mobile communication system can be more applicable for; particularly television broadcasting system; under transmitting antenna open circuit situation, whole system still can work on, and ensureing transmits does not interrupt.
This routine described control voltage generative circuit 4 is provided with comparator, and described detecting circuit amplifying circuit 3 is connected with the input of described comparator, and the output of described comparator is connected with described power control circuit 5.
More specifically, this example can be realized by the circuit theory diagrams of Fig. 2 to Fig. 6, and wherein, Fig. 6 is the circuit theory diagrams of power amplifier 6, is not described in detail herein to the circuit of this power amplifier 6; As shown in Figure 2, this routine described backward power coupling circuit 1 comprises electric capacity C1, electric capacity C3 and resistance R2, one end ground connection of described electric capacity C1, the other end of described electric capacity C1 is connected with one end of described electric capacity C3, and the other end of described electric capacity C3 is connected with outside radio circuit output; One end ground connection of described resistance R2, the other end of described resistance R2 is connected with the input of described broadband detecting circuit equalizing circuit 2.
This routine described broadband detecting circuit equalizing circuit 2 comprises RF power sensing circuit and voltage balance circuit, and described backward power coupling circuit 1 is connected to described voltage balance circuit by RF power sensing circuit.As shown in Figure 3, described RF power sensing circuit comprises resistance R13, resistance R14, electric capacity C3, resistance R32, electric capacity C53, resistance R33, electric capacity C51, resistance R56, electric capacity C58, resistance R48, resistance R99, electric capacity C375, resistance R84, electric capacity C74, resistance R85, electric capacity C12, resistance R88, electric capacity C69, electric capacity C151 and radio frequency power detector U65; The other end of described resistance R2 is connected with one end of resistance R13, the other end of described resistance R13 is connected with one end of one end of described resistance R14, one end of electric capacity C3 and resistance R32 respectively, and the other end of described resistance R32 is by described electric capacity C53 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R33 with the other end of electric capacity C3, and the other end of described resistance R33 is by electric capacity C51 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R56 with the other end of electric capacity C3, and the other end of described resistance R56 is by electric capacity C58 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R48 with the other end of electric capacity C3, the other end of described resistance R48 is connected with one end of one end of described resistance R99, one end of resistance R84, one end of resistance R85 and electric capacity C12 respectively, the other end of described resistance R99 is by electric capacity C375 ground connection, the other end of described resistance R84 is by electric capacity C74 ground connection, the other end of described resistance R85 is connected with one end of described resistance R88 respectively with the other end of electric capacity C12, the other end ground connection of described resistance R88; The other end of described resistance R85 is connected with one end of described electric capacity C151 respectively with the other end of electric capacity C12, and the other end of described electric capacity C151 is connected with the INHI pin of described radio frequency power detector U65.
As shown in Figure 3, described voltage balance circuit comprises electric capacity C184, electric capacity C189, resistance R105, electric capacity C104, electric capacity C174, electric capacity C179, electric capacity C180, electric capacity C190, resistance R106, electric capacity C302, diode D9, resistance R107 and resistance R100, the VPOS pin of described radio frequency power detector U65 respectively with one end of electric capacity C184, one end of electric capacity C189 is connected with one end of resistance R105, the other end of described electric capacity C184 and the other end of electric capacity C189 ground connection respectively, the other end of described resistance R105 respectively with one end of electric capacity C104, one end of electric capacity C174, one end of electric capacity C179, one end of electric capacity C180, one end of electric capacity C190 is connected with 5V power supply, the other end of described electric capacity C104, the other end of electric capacity C174, the other end of electric capacity C179, the other end of electric capacity C180 and the other end of electric capacity C190 ground connection respectively, the VOUT pin of described radio frequency power detector U65 is connected with one end of resistance R106, the other end of described resistance R106 is connected with one end of resistance R107 with one end of described electric capacity C302, the anode of diode D9 respectively, the other end of described electric capacity C302 is connected with one end of described resistance R100, and the other end ground connection of described electric capacity C302, the negative electrode of described diode D9, the other end of resistance R107 are connected with the input of described detecting circuit amplifying circuit 3 respectively with the other end of resistance R100.
As shown in Figure 4, this routine described detecting circuit amplifying circuit 3 comprises resistance R179, resistance R62 and operational amplifier U1, the output of described broadband detecting circuit equalizing circuit 2 is connected to the in-phase input end of operational amplifier U1, one end ground connection of described resistance R179, the other end of described resistance R179 is connected with one end of resistance R62 with the inverting input of described operational amplifier U1 respectively, and the other end of described resistance R62 is connected with the output of described operational amplifier U1.Described control voltage generative circuit 4 comprises resistance R184, resistance R187, electric capacity C89, operational amplifier U2, electric capacity C87, resistance R183, electric capacity C88 and diode D5; The output of described operational amplifier U1 is connected to the in-phase input end of described operational amplifier U2 by resistance R184, one end of described electric capacity C87 is connected with the in-phase input end of described operational amplifier U2, and the other end of described electric capacity C87 is connected with the output of described operational amplifier U2; One end of described resistance R187 is connected with external adjustable resistance with one end of electric capacity C89 respectively, the other end ground connection of described electric capacity C89, and the other end of described resistance R187 is connected with the inverting input of described operational amplifier U2; The output of described operational amplifier U2 is connected with the anode of diode D5 with one end of described electric capacity C88 respectively by resistance R183, the other end ground connection of described electric capacity C88, and the negative electrode of described diode D5 is connected to the input of described power control circuit 5.
As shown in Figure 5, this routine described power control circuit 5 comprises electric capacity C57, resistance R50, resistance R44, triode Q2, electric capacity C59, resistance R45, resistance R46, adjustable resistance VR10 and resistance R40, the negative electrode of described diode D5 is connected with one end of resistance R50 with one end of electric capacity C57 respectively, the other end of described resistance R50 is connected with the base stage of described triode Q2, the other end ground connection of described electric capacity C57; One end of described resistance R44 is connected with the base stage of described triode Q2, the other end ground connection of described resistance R44; One end of described electric capacity C59 is connected with the collector electrode of described triode Q2, the emitter of described triode Q2 and the other end of electric capacity C59 ground connection respectively; The collector electrode of described triode Q2 is connected with a stator pin of adjustable resistance VR10 with one end of described resistance R45 respectively, the other end of described resistance R45 is connected with one end of resistance R46 with another stator pin of described adjustable resistance VR10 respectively, the other end ground connection of described resistance R46; The moving plate pin of described adjustable resistance VR10 is connected to described power amplifier 6 by resistance R40.Described power control circuit 5 also comprises resistance R49, resistance R43, triode Q1, electric capacity C49, electric capacity C90, electric capacity C91, resistance R42, resistance R41, resistance R47 and electric capacity C54; One end of described resistance R49 is connected with the base stage of described triode Q1 respectively with one end of resistance R43, the other end ground connection of described resistance R49, the grounded emitter of described triode Q1, the other end of described resistance R43 is connected with the collector electrode of described triode Q1; The collector electrode of described triode Q1 is connected with one end of resistance R41 with one end of electric capacity C49, one end of electric capacity C90, one end of electric capacity C91, one end of resistance R42 respectively, the other end ground connection respectively of the other end of described electric capacity C49, the other end of electric capacity C90 and electric capacity C91; The other end of described resistance R42 is connected with one end of electric capacity C54 with one end of described resistance R47 respectively, the other end ground connection of described electric capacity C54, the other end of described resistance R47 is connected with the collector electrode of triode Q2, and the other end of described resistance R41 is connected with described power amplifier 6.
The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection range of the present utility model.
Claims (10)
1. the vswr protection device of a frequency microwave power amplifier, it is characterized in that, comprise: backward power coupling circuit, broadband detecting circuit equalizing circuit, detecting circuit amplifying circuit, control voltage generative circuit, power control circuit and power amplifier, described backward power coupling circuit is connected to detecting circuit amplifying circuit by broadband detecting circuit equalizing circuit, described detecting circuit amplifying circuit is connected to power control circuit by control voltage generative circuit, described power amplifier is connected with described power control circuit and adjusts its power output according to power control circuit, described power amplifier is connected with described backward power coupling circuit.
2. the vswr protection device of frequency microwave power amplifier according to claim 1; it is characterized in that; described control voltage generative circuit is provided with comparator; described detecting circuit amplifying circuit is connected with the input of described comparator, and the output of described comparator is connected with described power control circuit.
3. the vswr protection device of frequency microwave power amplifier according to claim 1 and 2, it is characterized in that, described backward power coupling circuit comprises electric capacity C1, electric capacity C3 and resistance R2, one end ground connection of described electric capacity C1, the other end of described electric capacity C1 is connected with one end of described electric capacity C3, and the other end of described electric capacity C3 is connected with outside radio circuit output; One end ground connection of described resistance R2, the other end of described resistance R2 is connected with the input of described broadband detecting circuit equalizing circuit.
4. the vswr protection device of frequency microwave power amplifier according to claim 3; it is characterized in that; described broadband detecting circuit equalizing circuit comprises RF power sensing circuit and voltage balance circuit, and described backward power coupling circuit is connected to described voltage balance circuit by RF power sensing circuit.
5. the vswr protection device of frequency microwave power amplifier according to claim 4, it is characterized in that, described RF power sensing circuit comprises resistance R13, resistance R14, electric capacity C3, resistance R32, electric capacity C53, resistance R33, electric capacity C51, resistance R56, electric capacity C58, resistance R48, resistance R99, electric capacity C375, resistance R84, electric capacity C74, resistance R85, electric capacity C12, resistance R88, electric capacity C69, electric capacity C151 and radio frequency power detector U65; The other end of described resistance R2 is connected with one end of resistance R13, the other end of described resistance R13 is connected with one end of one end of described resistance R14, one end of electric capacity C3 and resistance R32 respectively, and the other end of described resistance R32 is by described electric capacity C53 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R33 with the other end of electric capacity C3, and the other end of described resistance R33 is by electric capacity C51 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R56 with the other end of electric capacity C3, and the other end of described resistance R56 is by electric capacity C58 ground connection; The other end of described resistance R14 is all connected with one end of described resistance R48 with the other end of electric capacity C3, the other end of described resistance R48 is connected with one end of one end of described resistance R99, one end of resistance R84, one end of resistance R85 and electric capacity C12 respectively, the other end of described resistance R99 is by electric capacity C375 ground connection, the other end of described resistance R84 is by electric capacity C74 ground connection, the other end of described resistance R85 is connected with one end of described resistance R88 respectively with the other end of electric capacity C12, the other end ground connection of described resistance R88; The other end of described resistance R85 is connected with one end of described electric capacity C151 respectively with the other end of electric capacity C12, and the other end of described electric capacity C151 is connected with the INHI pin of described radio frequency power detector U65.
6. the vswr protection device of frequency microwave power amplifier according to claim 5, it is characterized in that, described voltage balance circuit comprises electric capacity C184, electric capacity C189, resistance R105, electric capacity C104, electric capacity C174, electric capacity C179, electric capacity C180, electric capacity C190, resistance R106, electric capacity C302, diode D9, resistance R107 and resistance R100, the VPOS pin of described radio frequency power detector U65 respectively with one end of electric capacity C184, one end of electric capacity C189 is connected with one end of resistance R105, the other end of described electric capacity C184 and the other end of electric capacity C189 ground connection respectively, the other end of described resistance R105 respectively with one end of electric capacity C104, one end of electric capacity C174, one end of electric capacity C179, one end of electric capacity C180, one end of electric capacity C190 is connected with 5V power supply, the other end of described electric capacity C104, the other end of electric capacity C174, the other end of electric capacity C179, the other end of electric capacity C180 and the other end of electric capacity C190 ground connection respectively, the VOUT pin of described radio frequency power detector U65 is connected with one end of resistance R106, the other end of described resistance R106 is connected with one end of resistance R107 with one end of described electric capacity C302, the anode of diode D9 respectively, the other end of described electric capacity C302 is connected with one end of described resistance R100, and the other end ground connection of described electric capacity C302, the negative electrode of described diode D9, the other end of resistance R107 are connected with the input of described detecting circuit amplifying circuit respectively with the other end of resistance R100.
7. the vswr protection device of frequency microwave power amplifier according to claim 3; it is characterized in that; described detecting circuit amplifying circuit comprises resistance R179, resistance R62 and operational amplifier U1; the output of described broadband detecting circuit equalizing circuit is connected to the in-phase input end of operational amplifier U1; one end ground connection of described resistance R179; the other end of described resistance R179 is connected with one end of resistance R62 with the inverting input of described operational amplifier U1 respectively, and the other end of described resistance R62 is connected with the output of described operational amplifier U1.
8. the vswr protection device of frequency microwave power amplifier according to claim 7, it is characterized in that, described control voltage generative circuit comprises resistance R184, resistance R187, electric capacity C89, operational amplifier U2, electric capacity C87, resistance R183, electric capacity C88 and diode D5; The output of described operational amplifier U1 is connected to the in-phase input end of described operational amplifier U2 by resistance R184, one end of described electric capacity C87 is connected with the in-phase input end of described operational amplifier U2, and the other end of described electric capacity C87 is connected with the output of described operational amplifier U2; One end of described resistance R187 is connected with external adjustable resistance with one end of electric capacity C89 respectively, the other end ground connection of described electric capacity C89, and the other end of described resistance R187 is connected with the inverting input of described operational amplifier U2; The output of described operational amplifier U2 is connected with the anode of diode D5 with one end of described electric capacity C88 respectively by resistance R183, the other end ground connection of described electric capacity C88, and the negative electrode of described diode D5 is connected to the input of described power control circuit.
9. the vswr protection device of frequency microwave power amplifier according to claim 8, it is characterized in that, described power control circuit comprises electric capacity C57, resistance R50, resistance R44, triode Q2, electric capacity C59, resistance R45, resistance R46, adjustable resistance VR10 and resistance R40, the negative electrode of described diode D5 is connected with one end of resistance R50 with one end of electric capacity C57 respectively, the other end of described resistance R50 is connected with the base stage of described triode Q2, the other end ground connection of described electric capacity C57; One end of described resistance R44 is connected with the base stage of described triode Q2, the other end ground connection of described resistance R44; One end of described electric capacity C59 is connected with the collector electrode of described triode Q2, the emitter of described triode Q2 and the other end of electric capacity C59 ground connection respectively; The collector electrode of described triode Q2 is connected with a stator pin of adjustable resistance VR10 with one end of described resistance R45 respectively, the other end of described resistance R45 is connected with one end of resistance R46 with another stator pin of described adjustable resistance VR10 respectively, the other end ground connection of described resistance R46; The moving plate pin of described adjustable resistance VR10 is connected to described power amplifier by resistance R40.
10. the vswr protection device of frequency microwave power amplifier according to claim 9, it is characterized in that, described power control circuit also comprises resistance R49, resistance R43, triode Q1, electric capacity C49, electric capacity C90, electric capacity C91, resistance R42, resistance R41, resistance R47 and electric capacity C54; One end of described resistance R49 is connected with the base stage of described triode Q1 respectively with one end of resistance R43, the other end ground connection of described resistance R49, the grounded emitter of described triode Q1, the other end of described resistance R43 is connected with the collector electrode of described triode Q1; The collector electrode of described triode Q1 is connected with one end of resistance R41 with one end of electric capacity C49, one end of electric capacity C90, one end of electric capacity C91, one end of resistance R42 respectively, the other end ground connection respectively of the other end of described electric capacity C49, the other end of electric capacity C90 and electric capacity C91; The other end of described resistance R42 is connected with one end of electric capacity C54 with one end of described resistance R47 respectively, the other end ground connection of described electric capacity C54, the other end of described resistance R47 is connected with the collector electrode of triode Q2, and the other end of described resistance R41 is connected with described power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520884453.5U CN205142141U (en) | 2015-11-06 | 2015-11-06 | Radio frequency microwave power amplifier's standing wave protection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
| CN108923757A (en) * | 2018-07-02 | 2018-11-30 | 成都九洲电子信息系统股份有限公司 | The detection of radio frequency power output closed loop and regulating device |
| CN110149098A (en) * | 2019-04-11 | 2019-08-20 | 广州慧智微电子有限公司 | A kind of protection circuit of radio-frequency power amplifier |
| CN110308758A (en) * | 2019-08-12 | 2019-10-08 | 扬州通信设备有限公司 | Shortwave power amplifier power stability closed control circuit |
-
2015
- 2015-11-06 CN CN201520884453.5U patent/CN205142141U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
| CN108923757A (en) * | 2018-07-02 | 2018-11-30 | 成都九洲电子信息系统股份有限公司 | The detection of radio frequency power output closed loop and regulating device |
| CN110149098A (en) * | 2019-04-11 | 2019-08-20 | 广州慧智微电子有限公司 | A kind of protection circuit of radio-frequency power amplifier |
| CN110149098B (en) * | 2019-04-11 | 2023-10-31 | 广州慧智微电子股份有限公司 | Protective circuit of radio frequency power amplifier |
| CN110308758A (en) * | 2019-08-12 | 2019-10-08 | 扬州通信设备有限公司 | Shortwave power amplifier power stability closed control circuit |
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