Dual-redundancy RVDT sensor signal redundancy management system

Abstract

The invention provides a dual-redundancy RVDT sensor signal redundancy management system, and relates to the technical field of RVDT sensors, and the system comprises a monitoring circuit which is used for monitoring a sensor signal, and a voting circuit which is used for carrying out the redundancy selection of a monitoring result of the monitoring circuit. And the voting circuit realizes redundancy management of dual-redundancy sensor signals through two groups of analog switches and an adder. According to the dual-redundancy RVDT sensor signal redundancy management system provided by the invention, the analog switch is adopted for monitoring and voting, the switching time is short (about 150ns) when a fault occurs, and the control influence on a rear end is very small; and the voting circuit provided by the system is simple, simple, reliable, low in cost and high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of RVDT sensors, and in particular provides a dual-redundancy RVDT sensor signal redundancy management system. Background Art

[0002] RVDT sensors have the advantages of simple structure, large linear measurement range, high measurement accuracy and high sensitivity. They can be used to measure physical quantities such as linear displacement and angular displacement, and have been widely used in the aviation field.

[0003] In order to meet the high safety requirements of aviation equipment and improve the reliability of the equipment, dual-redundancy RVDT sensors are usually used. At this time, the dual-redundancy RVDT sensor signal monitoring and voting strategy is involved. Summary of the invention

[0004] The purpose of this application is to solve the control problem of dual-redundancy RVDT sensor signals and propose a management system that can improve the reliability of aviation equipment and meet the high safety requirements of the equipment.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a dual-redundancy RVDT sensor signal redundancy management system, the redundancy management system includes a monitoring circuit for monitoring the sensor signal and a voting circuit for redundancy selection of the monitoring result of the monitoring circuit, and the voting circuit realizes redundancy management of the dual-redundancy sensor signal through two groups of analog switches and adders.

[0006] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the monitoring circuit includes an adding subcircuit, a rectifying and filtering subcircuit, and a window comparison subcircuit which are arranged in series.

[0007] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the adding subcircuit includes a first resistor and a second resistor respectively connected to the output ends of the two secondary coils of the sensor, the other ends of the first resistor and the second resistor are connected to the reverse input end of the first operational amplifier, the positive input end of the first operational amplifier is connected to a third resistor, the other end of the third resistor is grounded, and the reverse input end and the output end of the first operational amplifier are respectively connected to the two ends of the fourth resistor.

[0008] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the rectifier and filter subcircuit includes a fifth resistor connected to the addition subcircuit at one end, the other end of the fifth resistor is connected to the reverse input end of the second operational amplifier, the reverse input end and the output end of the second operational amplifier are respectively connected to the two ends of the sixth resistor, the positive input end of the second operational amplifier is connected to the seventh resistor, the other end of the seventh resistor is grounded, the reverse input end of the second operational amplifier is connected to the cathode of the first diode, the anode of the first diode is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is also connected to the cathode of the second diode, an eighth resistor is arranged between the anode of the second diode and the output end of the addition subcircuit, the anode of the second diode is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to the third operational amplifier, the positive input end of the third operational amplifier is connected to the tenth resistor, the other end of the tenth resistor is grounded, an eleventh resistor is arranged between the reverse input end and the output end of the third operational amplifier, the output end of the third operational amplifier is also connected to the first capacitor and the second capacitor, and the first capacitor and the second capacitor are both grounded.

[0009] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the window comparison subcircuit includes a twelfth resistor having one end connected to the output end of the rectifier and filter subcircuit, the other end of the twelfth resistor is connected to the reverse input end of the fourth voltage comparator and the positive input end of the fifth voltage comparator, the positive input end of the fourth voltage comparator is connected to the thirteenth resistor, the thirteenth resistor is connected to the power supply, the positive input end of the fourth voltage comparator is also connected to the grounded fourteenth resistor, the reverse input end of the voltage comparator is simultaneously connected to the grounded sixteenth resistor and the fifteenth resistor connected to the power supply, the input end of the fourth voltage comparator is connected to the seventeenth resistor connected to the power supply, and the output end of the fifth voltage comparator is connected to the eighteenth resistor connected to the power supply.

[0010] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the two groups of analog switches in the voting circuit are respectively controlled by different monitoring results of the monitoring circuit; the adder is used to realize the superposition of dual-redundancy sensor signals; and the voting circuit also includes an inverter connected to the adder.

[0011] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the two groups of analog switches are respectively a first analog switch group and a second analog switch group,

[0012] The first analog switch group includes a first analog switch and a third analog switch, the first analog switch is connected to the output end of the first sensor signal, the other end of the first analog switch is connected to the adder, and the third analog switch is arranged in the adder; the second analog switch group includes a second analog switch and a fourth analog switch, the second analog switch is connected to the output end of the second sensor signal, and the fourth analog switch is arranged in the adder.

[0013] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the adder includes a nineteenth resistor connected to the other end of the first analog switch, one end of the nineteenth resistor is connected to the reverse input end of the sixth operational amplifier, the reverse input end of the sixth operational amplifier is also connected to a twentieth resistor connected to the second analog switch, the forward input end of the sixth operational amplifier is connected to a grounded twenty-first resistor, a twenty-third resistor is connected in parallel between the reverse input end and the output end of the sixth amplifier, the third analog switch, the fourth analog switch and the twenty-second resistor are connected in series and connected in parallel between the reverse input end and the output end of the sixth amplifier, and the output end of the sixth operational amplifier is connected to the inverter.

[0014] The dual-redundancy RVDT sensor signal redundancy management system provided by the present invention also has the following technical features: the inverter includes a twenty-fourth resistor connected to the adder, the other end of the twenty-fourth resistor is connected to the reverse input terminal of the seventh operational amplifier, the positive input terminal of the seventh operational amplifier is connected to the grounded twenty-fifth resistor, and a twenty-sixth resistor is connected between the reverse input terminal and the output terminal of the seventh operational amplifier.

[0015] Beneficial Effects

[0016] The dual-redundancy RVDT sensor signal redundancy management system proposed in the present invention adopts analog switches for monitoring and voting. The switching time is short (about 150ns) in case of failure, and the influence on the back-end control is very small. In addition, the voting circuit provided by the system is simple, simple and reliable, low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A circuit diagram of an adding subcircuit in a monitoring circuit provided by an embodiment of the present invention;

[0019] Figure 2 A circuit diagram of a rectifier and filter subcircuit in a monitoring circuit provided by an embodiment of the present invention;

[0020] Figure 3 A circuit diagram of a window comparison subcircuit in a monitoring circuit provided by an embodiment of the present invention;

[0021] Figure 4 A circuit diagram of a voting circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0023] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0024] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0025] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0026] like Figure 1-4As shown, an embodiment of the present application provides a dual-redundancy RVDT sensor signal redundancy management system, wherein the redundancy management system includes a monitoring circuit for monitoring the sensor signal and a voting circuit for performing redundancy selection on the monitoring result of the monitoring circuit, and the voting circuit implements redundancy management of the dual-redundancy sensor signal through two groups of analog switches and adders.

[0027] In some embodiments, the monitoring circuit includes an adding subcircuit, a rectifying and filtering subcircuit, and a window comparison subcircuit which are arranged in series.

[0028] In some embodiments, the adding subcircuit includes a first resistor R1 and a second resistor R2 respectively connected to the output ends of the two secondary coils of the RVDT sensor, the other ends of the first resistor R1 and the second resistor R2 are connected to the inverting input end of the first operational amplifier U1, the positive input end of the first operational amplifier U1 is connected to the third resistor R3, the other end of the third resistor R3 is grounded, and the inverting input end and the output end of the first operational amplifier U1 are respectively connected to the two ends of the fourth resistor R4.

[0029] The voltage output from the two secondary coils of the RVDT is superimposed through an adding circuit:

[0030]

[0031] Among them, R1=R2.

[0032] In some embodiments, the rectification and filtering sub-circuit includes a fifth resistor R5 connected to the adding sub-circuit at one end, the other end of the fifth resistor R5 is connected to the inverting input end of the second operational amplifier U2, the inverting input end and the output end of the second operational amplifier U2 are respectively connected to the two ends of the sixth resistor R6, the positive input end of the second operational amplifier U2 is connected to the seventh resistor R7, the other end of the seventh resistor R7 is grounded, the inverting input end of the second operational amplifier U2 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the output end of the second operational amplifier U2, and the output end of the second operational amplifier U2 is also connected to the first An eighth resistor R8 is provided between the cathode of the second diode D2, the anode of the second diode D2 and the output end of the adding sub-circuit, the anode of the second diode D2 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the third operational amplifier U3, the positive input end of the third operational amplifier U3 is connected to the tenth resistor R10, the other end of the tenth resistor R10 is grounded, an eleventh resistor R11 is provided between the reverse input end and the output end of the second operational amplifier U2, the output end of the third operational amplifier U3 is also connected to the first capacitor C1 and the second capacitor C2, and the first capacitor C1 and the second capacitor C2 are both grounded.

[0033] WhenU OUT1 >0, U OUT2 =-kU OUT1 , when U OUT1 When U OUT2 =0; at this time, reverse summation is used to convert -k U OUT1 with U OUT1 By adding the negative half-cycle waveforms, full-wave rectification can be achieved. Its output voltage Uo = -U OUT2 -U OUT1 , U OUT1 >0 o'clock, Let R6=2R5,R8=R9, that is, k=2, Uo2=-2Ui; U OUT3 =2U OUT1 -U OUT1 =U OUT1 ; U OUT1 When U OUT2 =0; U OUT3 =-U OUT1 , so we can get U OUT3 =|U OUT1 |. After rectification, the circuit outputs a pulsating DC signal, so the output voltage needs to be filtered, and capacitors C1 and C2 form a filtering circuit.

[0034] In some embodiments, the window comparison subcircuit includes a twelfth resistor R12 having one end connected to the output end of the rectification and filtering subcircuit, the other end of the twelfth resistor R12 is connected to the reverse input end of the fourth voltage comparator U4 and the positive input end of the fifth voltage comparator U5, the positive input end of the fourth voltage comparator U4 is connected to the thirteenth resistor R13, the thirteenth resistor R13 is connected to the power supply, the positive input end of the fourth voltage comparator U4 is also connected to the grounded fourteenth resistor R14, the reverse input end of the voltage comparator U4 is simultaneously connected to the grounded sixteenth resistor R16 and the fifteenth resistor R15 connected to the power supply, the input end of the fourth voltage comparator U4 is connected to the seventeenth resistor R17 connected to the power supply, and the output end of the fifth voltage comparator U5 is connected to the eighteenth resistor R18 connected to the power supply.

[0035] When the input voltage of the Vi- terminal of the comparator U4 is less than V ref_H When V out_2A Output 5V, when the input voltage of Vi- terminal of comparator U4 is greater than V ref_H When V out_2A Output 0; when the input voltage of Vi+ terminal of comparator U5 is greater than V ref_L When V out_2B Output 5V, when the input voltage of Vi+ terminal of comparator U5 is less than V ref_LWhen V out_2A Output 0, where V ref_H =(5×R12 / (R11+R12))V, V ref_L =(5×R14 / (R13+R14))V. Pull-up resistors R17 and R18 realize the “AND” function. When V ref_L <V LVDT_HZ <V ref_H When the window comparator output is high level; when V LVDT_HZ <V ref_L or V LVDT_HZ >V ref_H When , the window comparator output is low.

[0036] In some embodiments, the two groups of analog switches of the voting circuit are respectively controlled by different monitoring results of the monitoring circuit, the adder is used to realize the superposition of dual-redundancy sensor signals, and the voting circuit also includes an inverter connected to the adder.

[0037] In some embodiments, the two groups of analog switches are respectively a first analog switch group and a second analog switch group.

[0038] The first analog switch group includes a first analog switch K1 and a third analog switch K3, the first analog switch K1 is connected to the output end of the signal of the first sensor RVDT1, the other end of the first analog switch K2 is connected to the adder, and the third analog switch K3 is arranged in the adder;

[0039] The second analog switch group includes a second analog switch K2 and a fourth analog switch K4 . The second analog switch K2 is connected to the output end of the signal of the second sensor RVDT2 . The fourth analog switch K4 is arranged in the adder.

[0040] In some embodiments, the adder includes a nineteenth resistor R19 connected to the other end of the first analog switch K1, one end of the nineteenth resistor R19 is connected to the reverse input end of the sixth operational amplifier U6, the reverse input end of the sixth operational amplifier U6 is also connected to the twentieth resistor R20 connected to the second analog switch K2, the positive input end of the sixth operational amplifier U6 is connected to the grounded twenty-first resistor R21, the reverse input end and the output end of the sixth amplifier U6 are connected in parallel with the twenty-third resistor R23, the third analog switch K3, the fourth analog switch K4 and the twenty-second resistor R22 are connected in series and connected in parallel between the reverse input end and the output end of the sixth amplifier U6, and the output end of the sixth operational amplifier U6 is connected to the inverter.

[0041] In some embodiments, the inverter includes a twenty-fourth resistor R24 ​​connected to the adder, the other end of the twenty-fourth resistor R24 ​​is connected to the inverting input terminal of the seventh operational amplifier U7, the positive input terminal of the seventh operational amplifier U7 is connected to the grounded twenty-fifth resistor R25, and a twenty-sixth resistor R26 is connected between the inverting input terminal and the output terminal of the seventh operational amplifier U7.

[0042] In the voting circuit, R19=R20=R22=R23. The analog switches K1 and K3 are controlled by the monitoring results of RVDT1. When the monitoring results of RVDT1 are normal, the switches K1 and K3 are closed. When the monitoring results of RVDT1 are abnormal, the switches K1 and K3 are opened. The analog switches K1 and K3 are controlled by the monitoring results of RVDT1. When the monitoring results of RVDT1 are normal, the switches K1 and K3 are closed. When the monitoring results of RVDT1 are abnormal, the switches K1 and K3 are opened. The analog switches K2 and K4 are controlled by the monitoring results of RVDT2. When the monitoring results of RVDT2 are normal, the switches K2 and K4 are closed. When the monitoring results of RVDT2 are abnormal, the switches K2 and K4 are opened. The analog switches K2 and K4 are controlled by the monitoring results of RVDT2. When the monitoring results of RVDT2 are normal, the switches K2 and K4 are closed. When the monitoring results of RVDT2 are abnormal, the switches K2 and K4 are opened.

[0043] When the monitoring results of RVDT1 and RVDT2 are normal, the analog switches K1, K3, K2, and K4 are all in the closed state. At this time, the resistor R22 is connected to the circuit, and V RVDT_OUT =1 / 2(V RVDT1_OUT +V RVDT2_OUT );

[0044] When the monitoring result of RVDT1 is normal and the monitoring result of RVDT2 is abnormal, the analog switches K1 and K3 are in the closed state, and the analog switches K2 and K4 are in the open state. At this time, there is only RVDT1 at the input end, and the resistor R22 is also in the open circuit state. RVDT_OUT =V RVDT1_OUT ;

[0045] When the monitoring result of RVDT2 is normal and the monitoring result of RVDT1 is abnormal, the analog switches K2 and K4 are in the closed state, and the analog switches K1 and K3 are in the open state. At this time, there is only RVDT2 at the input end, and the resistor R22 is also in the open circuit state. RVDT_OUT =V RVDT2_OUT .

[0046] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A dual-redundancy RVDT sensor signal redundancy management system, characterized in that: The redundancy management system includes a monitoring circuit for monitoring sensor signals and a voting circuit for performing redundancy selection based on monitoring results of the monitoring circuit. The voting circuit realizes redundancy management of dual-redundancy sensor signals through two groups of analog switches and adders.

2. The dual-redundancy RVDT sensor signal redundancy management system according to claim 1, characterized in that: The monitoring circuit comprises an adding subcircuit, a rectifying and filtering subcircuit and a window comparing subcircuit which are arranged in series.

3. The dual-redundancy RVDT sensor signal redundancy management system according to claim 2, characterized in that: The adding subcircuit includes a first resistor and a second resistor respectively connected to the output ends of the two secondary coils of the sensor, the other ends of the first resistor and the second resistor are connected to the inverting input end of the first operational amplifier, the positive input end of the first operational amplifier is connected to a third resistor, the other end of the third resistor is grounded, and the inverting input end and the output end of the first operational amplifier are respectively connected to the two ends of the fourth resistor.

4. The dual-redundancy RVDT sensor signal redundancy management system according to claim 2, characterized in that: The rectification and filtering sub-circuit includes a fifth resistor having one end connected to the adding sub-circuit, the other end of the fifth resistor being connected to the inverting input of the second operational amplifier, the inverting input and the output of the second operational amplifier being respectively connected to the two ends of the sixth resistor, the positive input of the second operational amplifier being connected to the seventh resistor, the other end of the seventh resistor being grounded, the negative input of the second operational amplifier being connected to the cathode of the first diode, the anode of the first diode being connected to the output of the second operational amplifier, the output of the second operational amplifier being further connected to the cathode of the second diode, an eighth resistor being arranged between the anode of the second diode and the output of the adding sub-circuit, the anode of the second diode being connected to one end of the ninth resistor, the other end of the ninth resistor being connected to the third operational amplifier, the positive input of the third operational amplifier being connected to the tenth resistor, the other end of the tenth resistor being grounded, an eleventh resistor being arranged between the negative input and the output of the third operational amplifier, the output of the third operational amplifier being further connected to the first capacitor and the second capacitor, both of which are grounded.

5. The dual-redundancy RVDT sensor signal redundancy management system according to claim 2, characterized in that: The window comparison subcircuit includes a twelfth resistor having one end connected to the output end of the rectification and filtering subcircuit, the other end of the twelfth resistor is connected to the reverse input end of the fourth voltage comparator and the positive input end of the fifth voltage comparator, the positive input end of the fourth voltage comparator is connected to the thirteenth resistor, the thirteenth resistor is connected to the power supply, the positive input end of the fourth voltage comparator is also connected to the grounded fourteenth resistor, the reverse input end of the voltage comparator is simultaneously connected to the grounded sixteenth resistor and the fifteenth resistor connected to the power supply, the input end of the fourth voltage comparator is connected to the seventeenth resistor connected to the power supply, and the output end of the fifth voltage comparator is connected to the eighteenth resistor connected to the power supply.

6. The dual-redundancy RVDT sensor signal redundancy management system according to claim 1, characterized in that: The two groups of analog switches in the voting circuit are respectively controlled by different monitoring results of the monitoring circuit. The adder is used to realize the superposition of dual-redundancy sensor signals. The voting circuit also includes an inverter connected to the adder.

7. The dual-redundancy RVDT sensor signal redundancy management system according to claim 6, characterized in that: The two groups of analog switches are respectively a first analog switch group and a second analog switch group, The first analog switch group includes a first analog switch and a third analog switch, the first analog switch is connected to the output end of the first sensor signal, the other end of the first analog switch is connected to the adder, and the third analog switch is arranged in the adder; the second analog switch group includes a second analog switch and a fourth analog switch, the second analog switch is connected to the output end of the second sensor signal, and the fourth analog switch is arranged in the adder.

8. The dual-redundancy RVDT sensor signal redundancy management system according to claim 7, characterized in that: The adder includes a nineteenth resistor connected to the other end of the first analog switch, one end of the nineteenth resistor is connected to the reverse input end of the sixth operational amplifier, the reverse input end of the sixth operational amplifier is also connected to a twentieth resistor connected to the second analog switch, the positive input end of the sixth operational amplifier is connected to a grounded twenty-first resistor, a twenty-third resistor is connected in parallel between the reverse input end and the output end of the sixth amplifier, the third analog switch, the fourth analog switch and the twenty-second resistor are connected in series and connected in parallel between the reverse input end and the output end of the sixth amplifier, and the output end of the sixth operational amplifier is connected to the inverter.

9. The dual-redundancy RVDT sensor signal redundancy management system according to claim 6, characterized in that: The inverter includes a twenty-fourth resistor connected to the adder, the other end of the twenty-fourth resistor is connected to the inverting input terminal of the seventh operational amplifier, the positive input terminal of the seventh operational amplifier is connected to the grounded twenty-fifth resistor, and a twenty-sixth resistor is connected between the inverting input terminal and the output terminal of the seventh operational amplifier.

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