CN109839127A - A kind of airborne proximity sensor Acquisition Circuit - Google Patents
A kind of airborne proximity sensor Acquisition Circuit Download PDFInfo
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- CN109839127A CN109839127A CN201711211888.3A CN201711211888A CN109839127A CN 109839127 A CN109839127 A CN 109839127A CN 201711211888 A CN201711211888 A CN 201711211888A CN 109839127 A CN109839127 A CN 109839127A
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Abstract
The invention belongs to airborne computer acquisition technique and application fields.The present invention devises a kind of airborne proximity sensor Acquisition Circuit, solves the problems, such as that airborne proximity sensor acquisition is complicated at present.The circuit is capable of the state of real-time detection proximity sensor, corresponding voltage signal is converted by the location information that proximity sensor measures, to carry out signal acquisition.The function of circuit includes: acquisition interface protection circuit, and interference filter circuit exchanges scaling circuit, AC to DC converter circuit, rectifies post filtering electric current.For this circuit by precise measurement proximity sensor since change in location causes the changing value of itself induction reactance, real-time monitoring proximity sensor state is converted into d. c. voltage signal for ac voltage signal is proportional.The present invention simplifies circuit structure relative to existing airborne proximity sensor Acquisition Circuit, has the characteristics that highly reliable, is provided simultaneously with the ability of the different ac-excited signals of adaptation, improves the job security and duration of airborne computer product.
Description
Technical field
The invention belongs to airborne computer interface acquisition technique and application fields, and in particular to a kind of airborne proximity sensor
Acquisition Circuit.
Background technique
With the development of aircraft industry, aircraft is gradually transitions electrical system control by traditional mechanical control.Aircraft is first
The preceding tradition machinery push type microswitch used, there are contact aging, mechanical life is low and adaptive capacity to environment is poor etc. lacks
Point.And airborne proximity sensor is closed using all-metal, carries out non-contact detecting to metal object, has service life length, reliability
The advantages that high and strong environmental adaptability.And then aviation field gradually uses airborne proximity sensor.It mainly uses electricity
Sensor, principle are to carry out non-contact detection using the mutual inductance effect of metallic conductor and alternating electromagnetic field.It is logical
The induction reactance value that measurement changes by the variation of proximity sensor internal magnetic field is crossed to determine the location status information of proximity sensor.Machine
Proximity sensor is carried to use at the position that bay door system, Landing Gear System, flight control system etc. detect mechanism in place more.For
This effectively accurately measures the acquisition of proximity sensor, and accurate response go out movement mechanism position and stroke it is just very heavy
It wants.
Proximity sensor precise acquiring circuit mostly uses intellectual monitoring circuit to realize at present, and complexity in circuits is high, can
The low, low precision by property, use is by biggish limitation under the conditions of high reliability request.
Summary of the invention
Present invention solves the technical problem that: provide that a kind of circuit is simple, high reliablity, airborne proximity sensor with high accuracy
Acquisition Circuit.
Technical solution of the present invention: a kind of airborne proximity sensor Acquisition Circuit, the circuit include ratio enlargement electricity
Road, interference filter circuit and AC to DC converter circuit, it is characterized in that: the AC to DC converter circuit includes operational amplifier,
Cache switching diodes are concatenated between the operational amplifier output input, operational amplifier output terminal is opened by being reversely connected high speed
It closes diode and resistance R7 is connected to the input terminal of operational amplifier, form inner loop feedback circuit；
After operational amplifier output terminal is reversely connected cache switching diodes, by series resistor R8 and resistance R6, formed outer
Ring feed circuit is connected to opamp input terminal after outer loop feedback circuit series resistor R5, and resistance R5 is located at inner loop feedback
Between circuit and outer loop feedback circuit.
Preferably, the quick closing valve frequency of the high speed diode is greater than twice of excitation a-c cycle, and the parasitic electricity of diode
Hold as small as possible.
Preferably, wherein AC to DC converter circuit figure R6, R9 should select similar resistance resistance, and R8 resistance value should be R6, R9
Resistance half.Major parameter is that R5, R6, R7, R9 use 20k Ω resistance in this patent, and R8 is 10k Ω resistance, R3 510
Ω resistance, R4 are 30k Ω resistance, and C2 is 100nf capacitor, and C3 is 3.3nf capacitor.
Preferably, wherein complete machine proximity sensor Acquisition Circuit needs scaling circuit, interference filter circuit, hands over
Circulation DC circuit and filter circuit cooperate.
Beneficial effects of the present invention: the AC to DC converter circuit in the technical program ensures ac input signal and direct current
Proportionate relationship between output voltage signal amplitude.Compared with prior art, sampling precision is improved.Meanwhile entire circuit structure letter
It is single, high reliablity.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is scaling circuit schematic diagram；
Fig. 3 is interference filter circuit diagram；
Fig. 4 is AC to DC converter circuit schematic diagram；
Fig. 5 is filter circuit schematic diagram.
Specific embodiment
Proximity sensor precise acquiring circuit is acquired the induction reactance value of airborne proximity sensor.It will by hard signal
D. c. voltage signal after acquiring and converting is reported, and is mounted with to approach sensing for complete machine bay door system, Landing Gear System etc.
The system of device provides accurate location status information.
Proximity sensor acquisition interface utilizes position of the method to proximity sensor for measuring inductance induction reactance in proximity sensor
Confidence number measures.Close to sensing acquisition interface circuit mainly by interface protection circuit, interference filter circuit, exchange turn direct current
Circuit, rectification post filtering circuit.Proximity sensor precise acquisition interface principle block diagram is as indicated with 1.
Interface protection circuit is used to carry out circuit protection when high current or big voltage occurs in proximity sensor input terminal, prevents
Only late-class circuit over-voltage or overcurrent damage.Scaling circuit is by the induction reactance of the variation of the proximity sensor under ac-excited effect
AC signal carries out the amplification of special ratios, so that late-class circuit carries out Transformation Application.Interference filter circuit is by amplified friendship
DC component and AC influence are filtered in stream signal.AC to DC converter circuit believes the exchange of interference filter circuit output
Number accurately be converted to convenient for acquisition d. c. voltage signal.Current rectifying and wave filtering circuit filters out the DC voltage ripple after conversion, protects
Demonstrate,prove the planarization of direct current signal.
1) interface protection circuit
Proximity sensor measures the direct-connected proximity sensor of interface, guarantees the accurate measurement of the information such as hatch door position, the information
It is related to the safety of aircraft flight.Interface protection circuit concatenates current-limiting resistance in input channel, to guarantee interface inputting electricity
Stream is limited in reasonable safe range, inputs to interface and carries out overcurrent protection；And transient state inhibition is connected in parallel at input interface
Device inputs interface and carries out over-voltage protection, prevents late-class circuit because of excessive pressure damages.Current-limiting resistance is concatenated in this patent uses 510
Ω.Transient suppressor selects the transient suppressor of corresponding protection power according to lightning protection specific requirement.
2) scaling circuit
Scaling circuit is one of the core of proximity sensor acquisition measurement interface, is serially connected in proximity sensor access
On, and concatenation follows circuit after amplifier output, guarantees the integrality of signal.Under the action of stablizing ac-excited, approach
Its induction reactance value of sensor different location state is different.By by the induction reactance value of proximity sensor and the high-precision reference of internal preset
Resistance R1 is built into scaling circuit.By the output voltage values of measurement scale amplifying circuit, pass through known internal reference
Resistance value, the inductance induction reactance value of available outside proximity sensor to be measured, and then determine proximity sensor location information.This
The reference resistance R1 used in patent is 300 Ω.Scaling circuit is shown in Fig. 2.Inductance induction reactance value calculates as follows:
3) interference filter circuit
The measurement accuracy of proximity sensor induction reactance is influenced to prevent external disturbance, design uses interference filter circuit.It is dry
Filter circuit is disturbed mainly to be made of low-pass first order filter and high-pass filter.Low-pass first order filter is made of R3 and C3, and one
Rank low pass filter cutoff frequency are as follows:
High-pass filter is made of C2 and R4.High Pass Filter Cutoff Frequency are as follows:
High Pass Filter Cutoff Frequency and low-pass first order filter cutoff frequency are carried out according to the frequency of external drive signal
Setting, guarantee effectively filter out low frequency and high-frequency noise, improve the acquisition precision of rear end Acquisition Circuit.Airborne sensor in this patent
Ac-excited source frequency be 1kHz, therefore relevant parameter R3 be 510 Ω resistance, R4 be 30k Ω resistance, C2 be 100nf capacitor, C3
For 3.3nf capacitor.Interference filter circuit is shown in Fig. 3.
4) AC to DC converter circuit
Since the input voltage and output voltage of scaling circuit are that AC signal is not easy to acquire, therefore design communication turns
DC circuit.The AC signal of interference filter circuit output is converted into the d. c. voltage signal convenient for acquisition, while ensuring to hand over
Proportionate relationship between input signal and direct current output voltage signal amplitude is flowed to determine.Design is using amplifier and cache switching diodes group
At precise rectification circuit, realize the full-wave rectification of AC signal.High speed is concatenated between the operational amplifier output input
Switching diode, operational amplifier output terminal are connected to the defeated of operational amplifier with resistance R7 by reversal connection cache switching diodes
Enter end, forms inner loop feedback circuit；After operational amplifier output terminal is reversely connected cache switching diodes, by series resistor R8 and
Resistance R6 forms outer loop feedback circuit, is connected to opamp input terminal, resistance R5 after outer loop feedback circuit series resistor R5
Between inner loop feedback circuit and outer loop feedback circuit.The quick closing valve frequency of high speed diode is greater than the two of excitation a-c cycle
Times, and diode parasitic capacitance is as small as possible.AC to DC converter circuit schematic diagram is shown in 4.
5) current rectifying and wave filtering circuit
The d. c. voltage signal of AC to DC converter circuit output is filtered out DC voltage ripple, is subtracted by current rectifying and wave filtering circuit
Few acquisition interference.Rectifying and wave-filtering integrates front end rectification circuit, then concatenates a second-order low-pass filter and a single order low pass
Filter is realized.The cutoff frequency of second-order low-pass filter are as follows:
Low-pass first order filter cutoff frequency are as follows:
Circuit parameter is as follows in this patent: R12 is 20K Ω, and R13 is 5k Ω, and C4 4.7nF, C4 47nF, R 14 is
20k Ω, C6 33nF.Current rectifying and wave filtering circuit schematic diagram is shown in 5.
Claims (4)
1. a kind of airborne proximity sensor Acquisition Circuit, the circuit includes scaling circuit, interference filter circuit and friendship
Circulate DC circuit, it is characterized in that: the AC to DC converter circuit includes operational amplifier, the operational amplifier output
High speed diode is concatenated between input, operational amplifier output terminal is connected to operation with resistance R7 by reversal connection high speed diode and puts
The input terminal of big device, forms inner loop feedback circuit；
After operational amplifier output terminal is reversely connected high speed diode, by series resistor R8 and resistance R6, outer loop feedback electricity is formed
Road, is connected to opamp input terminal after outer loop feedback circuit series resistor R5, and resistance R5 is located at inner loop feedback circuit and outer
Between ring feed circuit.
2. a kind of airborne proximity sensor Acquisition Circuit according to claim 1, it is characterized in that: the high speed diode
Quick closing valve frequency is greater than twice of excitation a-c cycle, and diode parasitic capacitance is as small as possible.
3. a kind of airborne proximity sensor Acquisition Circuit according to claim 1, it is characterized in that: wherein exchange turns direct current
Road figure R6, R9 should select similar resistance resistance, and R8 resistance value should be R6, R9 resistance half.Major parameter is in this patent
R5, R6, R7, R9 use 20k Ω resistance, and R8 is 10k Ω resistance, and R3 is 510 Ω resistance, and R4 is 30k Ω resistance, C2 100nf
Capacitor, C3 are 3.3nf capacitor.
4. a kind of airborne proximity sensor Acquisition Circuit according to claim 1, it is characterized in that: wherein complete machine is close
Sensor Acquisition Circuit needs scaling circuit, interference filter circuit, AC to DC converter circuit and filter circuit to be cooperated
It forms.
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| CN201711211888.3A CN109839127B (en) | 2017-11-27 | 2017-11-27 | Airborne proximity sensor acquisition circuit |
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| CN201711211888.3A CN109839127B (en) | 2017-11-27 | 2017-11-27 | Airborne proximity sensor acquisition circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715674A (en) * | 2019-10-18 | 2020-01-21 | 成都凯天电子股份有限公司 | Method for calculating corresponding inductance value of multi-channel proximity sensor |
| CN110994966A (en) * | 2019-11-14 | 2020-04-10 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne proximity sensor acquisition circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715674A (en) * | 2019-10-18 | 2020-01-21 | 成都凯天电子股份有限公司 | Method for calculating corresponding inductance value of multi-channel proximity sensor |
| CN110715674B (en) * | 2019-10-18 | 2024-11-08 | 成都凯天电子股份有限公司 | Method for calculating the corresponding inductance value of multi-channel proximity sensor |
| CN110994966A (en) * | 2019-11-14 | 2020-04-10 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne proximity sensor acquisition circuit |
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| CN109839127B (en) | 2021-04-20 |
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