CN110687856B - Dual-redundancy discrete type sensing position sensor signal intelligent acquisition and processing device - Google Patents
Dual-redundancy discrete type sensing position sensor signal intelligent acquisition and processing device Download PDFInfo
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- CN110687856B CN110687856B CN201911088023.1A CN201911088023A CN110687856B CN 110687856 B CN110687856 B CN 110687856B CN 201911088023 A CN201911088023 A CN 201911088023A CN 110687856 B CN110687856 B CN 110687856B
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
The invention discloses an intelligent acquisition and processing device for double-redundancy discrete induction position sensor signals, which comprises a terminal board, a first detection module and a second detection module; the terminal board is provided with a high-resistance differential amplifying circuit, an excitation power supply redundancy output circuit, a power supply redundancy circuit and a switching value position signal redundancy output circuit. The invention realizes double redundancy by arranging the first module and the second module with the same structure, namely, the main detection board is in a normal working state, outputs a normal excitation power supply and performs complete logic operation and position output function on the received signals. At this time, the slave detection board is in a standby state, whether the main detection board is faulty or not is continuously detected through the fault input pin, and when the main detection board is faulty, the main detection board automatically breaks off the output signal, and the slave detection board immediately starts working. Therefore, the redundancy of the system is realized, and the reliability of the system is improved. In a further normal working state, any detection plate can be plugged in and plugged out and maintained in an electrified mode, and the maintenance time of the system is obviously reduced.
Description
Technical Field
The invention relates to the technical field of signal acquisition and processing, in particular to an intelligent acquisition and processing device for signals of a dual-redundancy discrete induction position sensor.
Background
Currently, an electromagnetic induction position sensor is a sensor that senses the position of a measured object and converts the sensed object into an output electric signal. The electromagnetic induction position sensor is non-contact measurement, has no abrasion, good precision retention, simple structure, reliable operation, long service life, high sensitivity, simple protection and the like. In particular to the environment, and has strong adaptability to the environment, high humidity resistance, high temperature resistance and thermal deformation resistance. Therefore, the method is widely applied to the fields of nuclear power, military industry, automobiles, industrial robots and the like which need to collect position signals.
The conventional electromagnetic induction position sensor signal acquisition and processor adopts an operational amplification circuit and a comparison circuit, and judges whether an object reaches a position or not and outputs a switching value signal by comparing the acquired voltage value with a set value, but in actual use, any parameter change such as fluctuation of a power supply voltage, ageing of an element, change of a semiconductor element parameter caused by temperature change and the like can generate drift storage of an output voltage by adopting the operational amplification circuit. In addition, due to the limitation of circuit design, effective redundant design cannot be performed, so that reliability is low.
In face of the new requirements of high precision and high reliability of the electromagnetic position sensor signal acquisition and processor at present, the current measuring circuit can not meet the requirements. A signal acquisition and processor with high measurement precision and high reliability is required to be sought to solve the requirements of position measurement in the special field.
Disclosure of Invention
The invention aims to provide a double-redundancy discrete type sensing position sensor signal intelligent acquisition and processing device which can realize high precision and high reliability of position sensor measurement.
The invention adopts the technical scheme that:
The intelligent acquisition and processing device for the double-redundancy discrete sensing position sensor signal comprises a terminal board, a first detection module and a second detection module; the terminal board is provided with a high-resistance differential amplifying circuit, an excitation power supply redundancy output circuit, a power supply redundancy circuit and a switching value position signal redundancy output circuit;
The first detection module is provided with a signal processing circuit, an excitation power supply circuit, a power supply conversion circuit, a central processing unit and a relay output end circuit; the input end of the high-resistance state differential amplifying circuit is connected with the signal output end of the position sensor, the output end of the high-resistance state differential amplifying circuit is connected with the input end of the signal processing circuit, the output end of the central processing unit is connected with the input end of the excitation power supply redundancy output circuit through the excitation power supply circuit, and the output end of the excitation power supply redundancy output circuit is connected with the input end of the position sensor;
The control output end of the central processing unit is connected with the input end of the switching value redundant circuit through the relay output circuit, and the switching value redundant circuit is used for outputting a switching value position signal;
the input end of the power supply redundancy circuit is connected with the power supply inlet wire, and the output end of the power supply redundancy circuit is connected with the input end of the central processing unit through the power supply conversion circuit;
The second detection module and the first detection module are identical in structure, and the connection relation between the second detection module and the terminal board is identical to the connection between the first detection board and the terminal board.
The relay output circuit comprises seven paths of switching value control circuits, namely one path of control excitation power supply output, one path of control power supply input, one path of control fault output and four paths of position signal switching value output.
The CPU is DSP28335 and its auxiliary peripheral circuits.
The signal processing circuit is used for converting an alternating voltage signal into a voltage signal of 0-3V, transmitting the signal to the DSP analog-to-digital conversion module and converting the analog voltage signal into a digital signal.
The first detection module and the second detection module are respectively and fixedly arranged on a first detection plate and a second detection plate with interface terminals.
The interface terminal is an anti-misoperation interface terminal.
The output signal of the position sensor is converted into a corresponding voltage signal through a high internal resistance differential circuit, and the analog voltage signal is converted into a digital signal through a DSP analog-to-digital conversion module for processing.
The invention realizes double redundancy by arranging the first module and the second module with the same structure, namely, the main detection board is in a normal working state, outputs a normal excitation power supply and performs complete logic operation and position output function on the received signals. At this time, the slave detection board is in a standby state, whether the main detection board is faulty or not is continuously detected through the fault input pin, and when the main detection board is faulty, the power supply of the main detection board is automatically disconnected, and the slave detection board immediately starts working. Therefore, the redundancy of the system is realized, and the reliability of the system is improved. In a further normal working state, any detection plate can be plugged in and plugged out and maintained in an electrified mode, and the maintenance time of the system is obviously reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of the state of the relay output circuit of the main detection board of the present invention when in operation;
fig. 3 is a schematic diagram of the state of the relay output circuit when the slave detection board works in the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, 2 and 3, the present invention includes a terminal plate, a first detection module and a second detection module; the terminal board is provided with a high-resistance differential amplifying circuit, an excitation power supply redundancy output circuit, a power supply redundancy circuit and a switching value position signal redundancy output circuit; in practical application, the first detection module and the second detection module are respectively and fixedly arranged on the first detection plate and the second detection plate with the interface terminals. The interface terminal is an anti-misplug interface terminal, is convenient to connect, avoids misplug, and can facilitate double redundancy realization. The first detection module and the second detection module are provided with a main detection plate and a standby detection plate when in use.
The first detection board is provided with a signal processing circuit, an excitation power supply circuit, a power supply conversion circuit, a central processing unit and a relay output circuit; the input end of the high-resistance state differential amplifying circuit is connected with the signal output end of the position sensor, the output end of the high-resistance state differential amplifying circuit is connected with the input end of the signal processing circuit, the output end of the central processing unit is connected to the input end of the excitation power supply redundancy output circuit through the excitation power supply circuit, and the output end of the excitation power supply redundancy output circuit is connected with the input end of the position sensor.
The control output end of the central processing unit is connected with the input end of the switching value redundant circuit through the relay output circuit, and the switching value redundant circuit is used for outputting a switching value position signal;
the input end of the power supply redundancy circuit is connected with the power supply inlet wire, and the output end of the power supply redundancy circuit is connected with the input end of the central processing unit through the power supply conversion circuit;
The second detection plate is identical to the first detection plate in structure, and the connection relation between the second detection plate and the terminal plate is identical to the connection between the first detection plate and the terminal plate.
The relay output circuit comprises seven paths of switching value control circuits, namely one path of control excitation power supply output, one path of control power supply input, one path of control fault output and four paths of position signal switching value output. The central processing unit adopts a DSP28335.
The second detection plate and the first detection plate are arranged by adopting a circuit board in actual use, namely a 1# detection plate and a 2# detection plate, which are two board cards with identical software and hardware designs. The sensor comprises a sensor excitation power supply circuit, a position signal processing circuit, a digital signal processing chip (DSP 28335), a processor peripheral auxiliary circuit and a relay output circuit. The system is responsible for signal acquisition, position judgment and logic control of the whole system (the position judgment is the prior art and is not the invention point of the invention, so that the invention is not repeated here), and the two boards are redundant, so that the reliability of the true system is improved.
The sensor excitation power supply circuit on the detection board outputs an excitation power supply required by the position sensor under the control of the DSP, and the excitation power supply is output to the position sensor excitation coil on the terminal board through the excitation power supply redundant output circuit; the position sensor induction coil outputs corresponding current signals, the corresponding current signals are converted into voltage signals which can be directly processed by the detection plate through a high-resistance differential amplifying circuit on the terminal plate, and the voltage signals are respectively sent to the 1# detection plate and the 2# detection plate through the plug-in terminal 1 and the plug-in terminal 2; the detection board converts an alternating current voltage signal into a voltage signal of 0-3V through the position signal processing circuit, transmits the voltage signal to the DSP analog-to-digital conversion module, converts an analog voltage signal into a digital signal, and judges whether a measured object reaches the position through calculation and analysis, so that the relay output circuit controls the suction of the relay to convert the position signal into a switching value signal; the normally open contacts of the relays of the 1# detecting plate and the 2# detecting plate are connected in parallel through a switching value position signal output circuit at the terminal plate to output a position signal.
Different levels are set on the terminal board for the master-slave selection pins corresponding to the first plug-in terminal and the second plug-in terminal, wherein the master-slave selection pins of the first plug-in terminal are connected with the logic low level, and the master-slave selection pins of the second plug-in terminal are suspended. The sensing plate plugged into the first mating terminal is selected as the master sensing plate and the sensing plate plugged into the second mating terminal is selected as the slave sensing plate.
And under the normal working state, the main detection board outputs a normal excitation power supply and performs complete logic operation and position output functions on the received signals. At this time, the slave detection board is in a standby state, and whether the master detection board is in fault or not is continuously detected through the fault input pins, and each detection period is 100us. As shown in figure two; when the main detection board fails, the power supply of the main detection board is automatically disconnected (only the working power supply of the processor is reserved), and the main detection board immediately starts working. Outputting a position sensor excitation power supply from the detection plate under the control of the DSP, outputting corresponding current signals by the position sensor induction coil, converting the corresponding current signals into corresponding voltage signals on the port plate through a high internal resistance differential circuit, and respectively transmitting the voltage signals to the 1# detection plate and the 2# detection plate; the analog voltage signal is converted into a digital signal through the DSP analog-to-digital conversion module, and whether the measured object reaches the position is judged through calculation and analysis, so that the actuation of the relay is controlled, and a position signal is output, specifically:
Different circuits are arranged on the terminal board aiming at the plug-in terminal of the 1# board card and the plug-in terminal of the 2# board card, and the master-slave selection pins corresponding to the two connectors, wherein the plug-in terminal master-slave selection pins of the 1# board card are connected with logic low level, and the plug-in terminal master-slave selection pins of the 2# board card are suspended. The 1# board card is a main board, and the 2# board card is a slave board. When the self-test is not faulty after the main board is electrified, the K1.3 is sucked, so that the slave board is kept in a standby state.
Under the normal working condition, the sensor excitation power supply circuit on the detection board outputs alternating current excitation power supply required by the position sensor under the control of the DSP, and the excitation power supply passes through the excitation power supply redundant output circuit on the terminal board and is output to the position sensor excitation coil; the position sensor induction coil outputs corresponding current signals, the corresponding current signals are converted into voltage signals through a high-resistance differential amplifying circuit on the port plate, and the voltage signals are respectively sent to the 1# detection plate and the 2# detection plate through the plug-in terminals; the detection board converts an alternating current voltage signal into a direct current voltage signal of 0-3V through the position signal processing circuit, transmits the direct current voltage signal to the DSP analog-to-digital conversion modules of the two boards, converts an analog voltage signal into a digital signal, and judges whether a measured object reaches the position through calculation and analysis, so that the relay output circuit controls the suction of the relay to convert the position signal into a switching value signal; normally open contacts of relays of the 1# detecting plate (K1.4-K1.7) and the 2# detecting plate (K2.4-K2.7) are respectively connected in parallel at the terminal plates through a switching value position signal output circuit to output position signals.
And under the normal working state, the main detection board outputs a normal excitation power supply and performs complete logic operation and position output functions on the received signals. At this time, the slave detection plate is in a standby state, and whether the main detection plate fails or not is continuously detected by detecting whether K1.3 is sucked or not, and each detection period is 100us, as shown in a second diagram; when the main detection board fails, the actuation K1.3 outputs an alarm signal, and the actuation K1.1 disconnects the main board excitation power supply circuit; when the detection plate detects that K1.3 is disconnected, the work is started immediately, and the attraction K2.1 is connected with the excitation power supply circuit of the slave plate, so that the normal working state is ensured.
The invention has wide trial range: the electromagnetic position sensor has different coil direct current resistances at different temperatures, and the DSP calculates the environment temperature of the position sensor through the relation between the voltage and the current applied to the exciting coil, so that the position sensor can be reliably used in a wider temperature range through temperature correction.
The invention has wide trial range: the electromagnetic position sensor has different coil direct current resistances at different temperatures, and the DSP calculates the environment temperature of the position sensor through the relation between the voltage and the current applied to the exciting coil, so that the position sensor can be reliably used in a wider temperature range through temperature correction.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. Double-redundancy discrete type sensing position sensor signal intelligent acquisition and processing device is characterized in that: the device comprises a terminal board, a first detection module and a second detection module; the terminal board is provided with a high-resistance differential amplifying circuit, an excitation power supply redundancy output circuit, a power supply redundancy circuit and a switching value position signal redundancy output circuit;
The first detection module is provided with a signal processing circuit, an excitation power supply circuit, a power supply conversion circuit, a central processing unit and a relay output end circuit; the input end of the high-resistance state differential amplifying circuit is connected with the signal output end of the position sensor, the output end of the high-resistance state differential amplifying circuit is connected with the input end of the signal processing circuit, the output end of the central processing unit is connected with the input end of the excitation power supply redundancy output circuit through the excitation power supply circuit, and the output end of the excitation power supply redundancy output circuit is connected with the input end of the position sensor;
The control output end of the central processing unit is connected with the input end of the switching value redundant circuit through the relay output circuit, and the switching value redundant circuit is used for outputting a switching value position signal;
the input end of the power supply redundancy circuit is connected with the power supply inlet wire, and the output end of the power supply redundancy circuit is connected with the input end of the central processing unit through the power supply conversion circuit;
the second detection module has the same structure as the first detection module, and the connection relation between the second detection module and the terminal board is the same as the connection between the first detection board and the terminal board;
the relay output circuit comprises seven paths of switching value control circuits, namely one path of control excitation power supply output, one path of control power supply input, one path of control fault output and four paths of position signal switching value output;
the CPU is DSP28335 and its auxiliary peripheral circuits.
2. The dual redundant discrete inductive position sensor signal intelligent acquisition and processing device of claim 1, wherein: the signal processing circuit is used for converting an alternating voltage signal into a voltage signal of 0-3V, transmitting the signal to the DSP analog-to-digital conversion module and converting the analog voltage signal into a digital signal.
3. The dual redundant discrete inductive position sensor signal intelligent acquisition and processing device of claim 1, wherein: the first detection module and the second detection module are respectively and fixedly arranged on a first detection plate and a second detection plate with interface terminals.
4. The intelligent dual-redundant discrete sensing position sensor signal acquisition and processing device of claim 3, wherein: the interface terminal is an anti-misoperation interface terminal.
5. The dual redundant discrete inductive position sensor signal intelligent acquisition and processing device of claim 1, wherein: the output signal of the position sensor is converted into a corresponding voltage signal through a high internal resistance differential circuit, and the analog voltage signal is converted into a digital signal through a DSP analog-to-digital conversion module for processing.
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| CN111739669B (en) * | 2020-07-24 | 2022-02-01 | 中国核动力研究设计院 | Redundant excitation structure, system and method suitable for rod position detector of nuclear power station |
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| US4528458A (en) * | 1984-01-06 | 1985-07-09 | Ncr Corporation | Self-diagnostic redundant modular power supply |
| CN106321819A (en) * | 2015-06-25 | 2017-01-11 | 泰科电子(上海)有限公司 | Position sensor and position sensing system |
| CN106444354A (en) * | 2015-08-11 | 2017-02-22 | 南京理工大学 | Double-CPU redundant controller |
| CN108146494A (en) * | 2017-12-18 | 2018-06-12 | 联创汽车电子有限公司 | The electronic control unit of EPS |
| CN210924245U (en) * | 2019-11-08 | 2020-07-03 | 卧龙电气南阳防爆集团股份有限公司 | Dual-redundancy discrete inductive position sensor signal intelligent acquisition and processing device |
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- 2019-11-08 CN CN201911088023.1A patent/CN110687856B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4528458A (en) * | 1984-01-06 | 1985-07-09 | Ncr Corporation | Self-diagnostic redundant modular power supply |
| CN106321819A (en) * | 2015-06-25 | 2017-01-11 | 泰科电子(上海)有限公司 | Position sensor and position sensing system |
| CN106444354A (en) * | 2015-08-11 | 2017-02-22 | 南京理工大学 | Double-CPU redundant controller |
| CN108146494A (en) * | 2017-12-18 | 2018-06-12 | 联创汽车电子有限公司 | The electronic control unit of EPS |
| CN210924245U (en) * | 2019-11-08 | 2020-07-03 | 卧龙电气南阳防爆集团股份有限公司 | Dual-redundancy discrete inductive position sensor signal intelligent acquisition and processing device |
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