CN109839127B - Airborne proximity sensor acquisition circuit - Google Patents
Airborne proximity sensor acquisition circuit Download PDFInfo
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- CN109839127B CN109839127B CN201711211888.3A CN201711211888A CN109839127B CN 109839127 B CN109839127 B CN 109839127B CN 201711211888 A CN201711211888 A CN 201711211888A CN 109839127 B CN109839127 B CN 109839127B
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- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 4
- 230000003071 parasitic effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
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- 238000013341 scale-up Methods 0.000 description 2
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Abstract
The invention belongs to the field of airborne computer acquisition technology and application. The invention designs an airborne proximity sensor acquisition circuit, which solves the problem of complex acquisition of the current airborne proximity sensor. The circuit can detect the state of the proximity sensor in real time, and converts position information measured by the proximity sensor into corresponding voltage signals so as to acquire the signals. The functions of the circuit include: the device comprises a collection interface protection circuit, an interference filter circuit, an alternating current proportional amplification circuit, an alternating current-to-direct current circuit and a filtered current after rectification. The circuit monitors the state of the proximity sensor in real time by accurately measuring the change value of the self inductive reactance of the proximity sensor caused by the position change, and converts an alternating voltage signal into a direct voltage signal in proportion. Compared with the existing airborne proximity sensor acquisition circuit, the airborne proximity sensor acquisition circuit has the advantages of simplifying the circuit structure, having high reliability, simultaneously having the capability of adapting to different alternating current excitation signals, and improving the working safety and the continuity of airborne computer products.
Description
Technical Field
The invention belongs to the field of airborne computer interface acquisition technology and application, and particularly relates to an airborne proximity sensor acquisition circuit.
Background
As the aviation industry has developed, aircraft have gradually transitioned from conventional mechanical control to electrical system control. The traditional mechanical pressing type microswitch used by the airplane in the past has the defects of contact aging, low mechanical service life, poor environmental adaptability and the like. The airborne proximity sensor is sealed by adopting all metal, carries out non-contact detection on metal objects, and has the advantages of long service life, high reliability, strong environment adaptability and the like. And the aviation field gradually uses airborne proximity sensors. The method mainly adopts an inductive proximity sensor, and the principle is that the mutual inductance effect of a metal conductor and an alternating electromagnetic field is utilized to carry out non-contact detection. Position state information of the proximity sensor is determined by measuring an inductive reactance value that varies due to a change in a magnetic field inside the proximity sensor. The airborne proximity sensor is often used in a position where the mechanism is detected in place, such as a cabin door system, an undercarriage system, a flight control system, and the like. Therefore, it is very important to effectively and accurately acquire and measure the proximity sensor and accurately reflect the position and the stroke of the motion mechanism.
At present, an accurate acquisition circuit of a proximity sensor is mostly realized by adopting an intelligent monitoring circuit, the circuit has high complexity, low reliability and poor precision, and the use is greatly limited under the condition of high reliability requirement.
Disclosure of Invention
The technical problems solved by the invention are as follows: the airborne proximity sensor acquisition circuit is simple in circuit, high in reliability and high in precision.
The technical scheme of the invention is as follows: the utility model provides an airborne proximity sensor acquisition circuit, the circuit include proportional amplification circuit, interference filter circuit and exchange and change direct current circuit, characterized by: the alternating current-to-direct current circuit comprises an operational amplifier, wherein a high-speed switching diode is connected between the output and the input of the operational amplifier in series, and the output end of the operational amplifier is connected to the input end of the operational amplifier through a reverse connection high-speed switching diode and a resistor R7 to form an inner loop feedback circuit;
after the output end of the operational amplifier is reversely connected with the high-speed switching diode, an outer loop feedback circuit is formed by connecting a resistor R8 and a resistor R6 in series, the outer loop feedback circuit is connected to the input end of the operational amplifier after being connected with a resistor R5 in series, and the resistor R5 is positioned between the inner loop feedback circuit and the outer loop feedback circuit.
Preferably, the fast-switching frequency of the high-speed diode is greater than twice the excitation ac frequency, and the diode parasitic capacitance is as small as possible.
Preferably, the ac-dc conversion circuit diagrams R6 and R9 should select resistors with the same resistance, and the resistance of R8 should be half of the resistance of R6 and R9. In the patent, the main parameters of R5, R6, R7 and R9 adopt 20k omega resistors, R8 is 10k omega resistor, R3 is 510 omega resistor, R4 is 30k omega resistor, C2 is 100nf capacitor, and C3 is 3.3nf capacitor.
Preferably, the complete machine proximity sensor acquisition circuit needs a proportional amplification circuit, an interference filter circuit, an alternating current-to-direct current circuit and a filter circuit to be matched.
The invention has the beneficial effects that: the alternating current-to-direct current circuit in the technical scheme ensures the proportional relation between the amplitude of the alternating current input signal and the amplitude of the direct current output voltage signal. Compared with the prior art, the sampling precision is improved. Meanwhile, the whole circuit is simple in structure and high in reliability.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic diagram of a scale-up circuit;
FIG. 3 is a schematic diagram of an interference filter circuit;
FIG. 4 is a schematic diagram of an AC to DC converter circuit;
fig. 5 is a schematic diagram of a filter circuit.
Detailed Description
The accurate acquisition circuit of the proximity sensor acquires the inductive reactance value of the airborne proximity sensor. The collected and converted direct current voltage signals are reported through hard wire signals, and accurate position state information is provided for systems such as a whole machine cabin door system and an undercarriage system which are provided with proximity sensors.
The proximity sensor acquisition interface measures the position signal of the proximity sensor by measuring the inductive reactance of the inductance in the proximity sensor. The approach sensing acquisition interface circuit mainly comprises an interface protection circuit, an interference filter circuit, an alternating current-to-direct current circuit and a post-rectification filter circuit. The schematic block diagram of the proximity sensor accurate acquisition interface is shown in fig. 1.
The interface protection circuit is used for performing circuit protection when large current or large voltage appears at the input end of the proximity sensor, and preventing overvoltage or overcurrent damage of a post-stage circuit. The proportional amplifying circuit amplifies the variable inductive reactance alternating current signal of the proximity sensor under the action of alternating current excitation in a specific proportion so as to be convenient for a subsequent circuit to convert and apply. The interference filter circuit filters the direct current component and the alternating current interference in the amplified alternating current signal. The alternating current-to-direct current conversion circuit accurately converts alternating current signals output by the interference filter circuit into direct current voltage signals convenient to collect. The rectification filter circuit filters the converted direct-current voltage ripple waves and ensures the smoothness of direct-current signals.
1) Interface protection circuit
The proximity sensor measurement interface is directly connected with the proximity sensor, so that accurate measurement of information such as cabin door position is guaranteed, and the information relates to the safety of airplane flight. The interface protection circuit is connected with a current-limiting resistor in series in an input path to ensure that the input current of the interface is limited in a reasonable safety range and carry out overcurrent protection on the input of the interface; and the transient suppressor is connected in parallel at the input interface to perform overvoltage protection on the interface input so as to prevent a rear-stage circuit from being damaged due to overvoltage. The current limiting resistor connected in series in the patent adopts 510 omega. And the transient suppressor selects the transient suppressor corresponding to the protection power according to the specific requirements of lightning protection.
2) Proportional amplifying circuit
The proportional amplification circuit is one of the cores of the acquisition and measurement interface of the proximity sensor, is connected in series on a path of the proximity sensor, and is connected in series with the follower circuit after the output of the amplifier, so that the integrity of signals is ensured. Under the action of stable alternating current excitation, the inductive reactance values of the proximity sensor are different in different position states. A proportional amplifying circuit is constructed by combining the inductance value of the proximity sensor and a high-precision reference resistor R1 preset inside. By measuring the output voltage value of the proportional amplifying circuit and by the known internal reference resistance value, the inductance inductive reactance value of the external proximity sensor to be measured can be obtained, and further the position information of the proximity sensor can be determined. The reference resistor R1 used in this patent is 300 Ω. The scale up circuit is shown in figure 2. The inductance and reactance value was calculated as follows:
3) interference filter circuit
In order to prevent the measuring precision of the inductive reactance of the proximity sensor from being influenced by external interference, an interference filter circuit is designed. The interference filter circuit is mainly composed of a first-order low-pass filter and a high-pass filter. The first-order low-pass filter consists of R3 and C3, and the cut-off frequency of the first-order low-pass filter is as follows:
the high pass filter consists of C2 and R4. The high pass filter cutoff frequency is:
the cut-off frequency of the high-pass filter and the cut-off frequency of the first-order low-pass filter are set according to the frequency of an external excitation signal, so that low-frequency and high-frequency noise is effectively filtered, and the acquisition precision of the rear-end acquisition circuit is improved. In the patent, the frequency of an alternating current excitation source of the airborne sensor is 1kHz, so that the related parameters R3 are 510 omega resistance, R4 is 30k omega resistance, C2 is 100nf capacitance, and C3 is 3.3nf capacitance. The interference filter circuit is shown in figure 3.
4) AC-DC converting circuit
Because the input voltage and the output voltage of the proportional amplifying circuit are both alternating current signals which are not easy to collect, the alternating current-to-direct current circuit is designed. The alternating current signal output by the interference filter circuit is converted into a direct current voltage signal convenient to collect, and meanwhile, the proportional relation between the amplitude of the alternating current input signal and the amplitude of the direct current output voltage signal is ensured to be determined. A precise rectifying circuit consisting of an operational amplifier and a high-speed switching diode is designed to realize full-wave rectification of alternating current signals. The output end of the operational amplifier is connected with the input end of the operational amplifier through a high-speed switching diode and a resistor R7 in a reverse connection manner to form an inner loop feedback circuit; after the output end of the operational amplifier is reversely connected with the high-speed switching diode, an outer loop feedback circuit is formed by connecting a resistor R8 and a resistor R6 in series, the outer loop feedback circuit is connected to the input end of the operational amplifier after being connected with a resistor R5 in series, and the resistor R5 is positioned between the inner loop feedback circuit and the outer loop feedback circuit. The fast-switching frequency of the high-speed diode is more than twice the excitation AC frequency, and the parasitic capacitance of the diode is as small as possible. The schematic diagram of the AC-DC conversion circuit is shown in figure 4.
5) Rectifying and filtering circuit
The direct current voltage signal output by the alternating current-to-direct current circuit passes through the rectification filter circuit, so that direct current voltage ripples are filtered, and acquisition interference is reduced. The rectification filtering is realized by integrating a front-end rectification circuit and then connecting a second-order low-pass filter and a first-order low-pass filter in series. The cut-off frequency of the second order low pass filtering is:
the first order low pass filter cutoff frequency is:
the circuit parameters in this patent are as follows: r12 is 20K Ω, R13 is 5K Ω, C4 is 4.7nF, C4 is 47nF, R14 is 20K Ω, and C6 is 33 nF. The principle diagram of the rectification filter circuit is shown in 5.
Claims (3)
1. The utility model provides an airborne proximity sensor acquisition circuit, the circuit include interface protection circuit, proportional amplification circuit, interference filter circuit, exchange and change direct current circuit and rectification filter circuit, characterized in that:
the interface protection circuit is connected in series with a current-limiting resistor in an input path and is connected in parallel with a transient suppressor;
the proportional amplifying circuit is connected in series on the approach sensor passage and is connected in series with the following circuit after the output of the amplifier; constructing a proportional amplification circuit by the inductive reactance value of the proximity sensor and an internal preset high-precision reference resistor R1, measuring the output voltage value of the proportional amplification circuit, and obtaining the inductive reactance value of the external proximity sensor to be detected through a known internal reference resistance value so as to determine the position information of the proximity sensor;
the interference filtering circuit consists of a first-order low-pass filter and a high-pass filter, wherein the first-order low-pass filter consists of R3 and C3, and the first-order high-pass filter consists of C2 and R4;
the alternating current-to-direct current circuit comprises an operational amplifier, wherein a high-speed diode is connected between the output and the input of the operational amplifier in series, and the output end of the operational amplifier is connected to the input end of the operational amplifier through a reverse high-speed diode and a resistor R7 to form an inner loop feedback circuit; after the output end of the operational amplifier is reversely connected with the high-speed diode, an outer loop feedback circuit is formed by connecting a resistor R8 and a resistor R6 in series, the outer loop feedback circuit is connected to the input end of the operational amplifier after being connected with a resistor R5 in series, and the resistor R5 is positioned between the inner loop feedback circuit and the outer loop feedback circuit;
the rectification filter circuit integrates the front end rectification circuit and is connected with a second-order low-pass filter and a first-order low-pass filter in series.
2. The on-board proximity sensor acquisition circuit of claim 1, wherein: the switching frequency of the high-speed diode is more than twice the excitation alternating frequency, and the parasitic capacitance of the diode is as small as possible.
3. The on-board proximity sensor acquisition circuit of claim 1, wherein: the AC-DC converting circuit R6 and R9 should select resistors with the same resistance value, the resistance value of R8 should be R6, and the resistance value of R9 should be half; r5, R6, R7 and R9 adopt 20k omega resistors, R8 is a 10k omega resistor, R3 is a 510 omega resistor, R4 is a 30k omega resistor, C2 is a 100nf capacitor, and C3 is a 3.3nf capacitor.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (6)
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|---|---|---|---|---|
| US5929759A (en) * | 1996-12-05 | 1999-07-27 | Schneider Electric Sa | Proximity detector with rapid reception amplification |
| EP2237062A1 (en) * | 2009-04-01 | 2010-10-06 | ELSAG DATAMAT S.p.A. | Proximity sensor for a parking area |
| CN102707128A (en) * | 2012-01-10 | 2012-10-03 | 河南科技大学 | Circuit and method for acquiring alternating signal based on microcontroller |
| CN203479883U (en) * | 2013-10-18 | 2014-03-12 | 温州港湾安全科技有限公司 | Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector |
| CN104000584A (en) * | 2014-05-30 | 2014-08-27 | 深圳贝特莱电子科技有限公司 | Weak signal acquisition circuit with high SNR (Signal to Noise Ratio) |
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2017
- 2017-11-27 CN CN201711211888.3A patent/CN109839127B/en active Active
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|---|---|---|---|---|
| US5929759A (en) * | 1996-12-05 | 1999-07-27 | Schneider Electric Sa | Proximity detector with rapid reception amplification |
| EP2237062A1 (en) * | 2009-04-01 | 2010-10-06 | ELSAG DATAMAT S.p.A. | Proximity sensor for a parking area |
| CN102707128A (en) * | 2012-01-10 | 2012-10-03 | 河南科技大学 | Circuit and method for acquiring alternating signal based on microcontroller |
| CN203479883U (en) * | 2013-10-18 | 2014-03-12 | 温州港湾安全科技有限公司 | Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector |
| CN104000584A (en) * | 2014-05-30 | 2014-08-27 | 深圳贝特莱电子科技有限公司 | Weak signal acquisition circuit with high SNR (Signal to Noise Ratio) |
| CN107328975A (en) * | 2017-07-25 | 2017-11-07 | 西安电子科技大学 | A kind of high speed multichannel signal Acquisition Circuit |
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