CN112711206B - Signal conditioning circuit, conditioning method and acquisition box - Google Patents
Signal conditioning circuit, conditioning method and acquisition box Download PDFInfo
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- CN112711206B CN112711206B CN202011446571.XA CN202011446571A CN112711206B CN 112711206 B CN112711206 B CN 112711206B CN 202011446571 A CN202011446571 A CN 202011446571A CN 112711206 B CN112711206 B CN 112711206B
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- 230000003750 conditioning effect Effects 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 230000003068 static effect Effects 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001143 conditioned effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000013480 data collection Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 241001604129 Polydactylus Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- 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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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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
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The application relates to a signal conditioning circuit, a conditioning method and a collection box, wherein the conditioning circuit comprises a direct current power supply; the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V+ and a power supply negative electrode port V-; the power supply negative electrode port V-is connected with the negative electrode end of the direct current power supply; a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V+ of the power supply and the positive electrode of the direct-current power supply; the movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the stationary contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V+ of the power supply, and the stationary contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1; the two ends of the second resistor R2 are signal output ends. The conditioning method comprises the following steps: the sensor is connected to the wiring terminal; and adjusting the switch to a corresponding state. The collection box includes: the box, the panel, a plurality of groups of signal conditioning circuits integrated on the panel. The sensor data acquisition device has the effect of being applicable to various sensors.
Description
Technical Field
The application relates to the technical field of signal acquisition, in particular to a signal conditioning circuit, a conditioning method and an acquisition box.
Background
The hydraulic engineering is a built engineering for controlling and allocating surface water and underground water in nature to achieve the purpose of pest removal and benefit.
In the field test of hydraulic and hydroelectric engineering, various sensors with various types are often required to be used, and more common sensors are as follows: vibration sensor, pressure sensor, displacement sensor, liquid level sensor, flowmeter, flow rate meter, temperature sensor, pull pressure sensor etc.. The test person needs to perform signal data acquisition for each type of sensor signal. However, the output signal types of different sensors are often different, such as a current type output sensor, a voltage type output sensor, a pulse type output sensor and the like, and when collecting signals of various sensors, a special type data acquisition device is required to acquire signal data according to the signal types of the sensors.
With respect to the related art described above, the inventors consider that there is a defect that the sensor data acquisition device can acquire only one type of sensor signal, and is inflexible in use.
Disclosure of Invention
In order to realize that the sensor data acquisition device is applicable to various sensors, the application provides a signal conditioning circuit, a conditioning method and an acquisition box.
In a first aspect, the present application provides a signal conditioning circuit that adopts the following technical scheme:
a signal conditioning circuit comprising:
a direct current power supply;
the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V+ and a power supply negative electrode port V-;
the power supply negative electrode port V-is connected with the negative electrode end of the direct current power supply;
a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V+ of the power supply and the positive electrode of the direct-current power supply;
the movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the fixed contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V+ of the power supply, and the fixed contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1;
and two ends of the second resistor R2 are signal output ends.
Through adopting above-mentioned technical scheme, with single-pole double-throw switch SB 1's movable contact break off to with the stationary contact closure of last difference can make the conditioning circuit form two sets of different circuit return circuits, the partial pressure demand of the passive sensor of conditioning circuit adaptable two-wire system external circuit, the signal conversion in the acquisition scope of the non-coincidence same data acquisition card of sensor input accords with the signal in the same acquisition scope, make the same passageway of data acquisition card can gather the signal of multiple sensor, and the composition of conditioning circuit is simple, be convenient for integrate in small-size equipment and carry, thereby have the nimble effect of use.
Preferably, a single-pole three-throw switch SB2 is coupled between the dc power supply and the second resistor R2, the movable contact of the single-pole three-throw switch SB2 is connected to the positive terminal of the dc power supply, the stationary contact C of the single-pole three-throw switch SB2 is turned off in a vacant manner, the stationary contact D of the single-pole three-throw switch SB2 is connected to the second resistor R2, and the stationary contact E of the single-pole three-throw switch SB2 is connected to the positive terminal v+ of the power supply;
the wiring terminal also comprises a first signal port S1 and a second signal port S2;
a third resistor R3 and a fourth resistor R4 are sequentially connected between the first signal port S1 and a fixed contact E of the single-pole three-throw switch SB 2;
a single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2;
the signal output end is connected with a double-pole double-throw switch SB4, the movable contact of the double-pole double-throw switch SB4 is connected with the signal output end, two stationary contacts of a stationary contact set 1 of the double-pole double-throw switch SB4 are respectively connected between a second resistor R2 and a single-pole double-throw switch SB1, a second signal port S2 and a single-pole single-throw switch SB3, and two stationary contacts of a stationary contact set 2 of the double-pole double-throw switch SB4 are respectively connected with two ends of a fourth resistor R4.
By adopting the technical scheme, the switch is broken off, the movable contact and the corresponding fixed contact of the switch are closed and/or regulated to be in an open state, so that the sensor is connected with different resistors of the conditioning circuit, the first signal port S1 and the second signal port S2 are additionally arranged on the wiring terminal, the conditioning circuit can be connected with a two-wire system sensor and a three-wire system sensor, the single-pole three-throw switch SB2 is additionally arranged, the conditioning circuit can be matched with an external circuit active or passive sensor, the direct current power supply is connected or disconnected through the single-pole three-throw switch SB2, the ports of the switches connected with the wiring terminal are different from the ports of the sensors, the current circuit composition presented by the conditioning circuit is different, the conditioning circuit can be matched with the voltage division requirements of various types of sensors, the sensor signals of different types and different ranges are converted into voltage signals which can be collected by the same type of data acquisition card, the adaptability of the signal acquisition device is higher, and the use is more flexible.
Preferably, the dc power supply is a 24V dc power supply, the resistance of the first resistor R1 is 1kΩ, and the resistance of the second resistor R2 is 250 Ω; the resistance value of the third resistor R3 is 2KΩ, and the resistance value of the fourth resistor R4 is 1KΩ.
By adopting the technical scheme, the current range output by the current type output sensor is usually 4-20mA voltage pulse type output sensor, the voltage pulse output by the current type output sensor is the highest DC power supply voltage, the setting of resistance value is calculated according to the formulas such as a current voltage formula and ohm law, the voltage range output after conditioning is 0-5V, all data acquisition cards with the acquisition range of +/-10V are adapted, in the data acquisition cards for acquiring electrical parameters in the field, the data acquisition card for acquiring the voltage value is the data acquisition card which is convenient at present and has higher precision and the most mature technology, because the condition of overranging can occur when part of sensors are used under individual working conditions, the output signal of the sensors exceeds the maximum value, the conditioning circuit conditions the sensor signals into 0-5V voltage signals, the data acquisition card for acquiring and reading the sensor with the acquisition range of +/-10V leaves a margin after conditioning, the acquisition range of the data acquisition card completely covers the output signal range of the sensor, and the loss of signals is reduced.
In a second aspect, the present application provides a signal conditioning method, which adopts the following technical scheme:
the signal conditioning method for performing signal conditioning by adopting the signal conditioning circuit comprises the following steps:
accessing a sensor of data to be acquired to a corresponding port of the wiring terminal;
and adjusting the switch to a corresponding state.
By adopting the technical scheme, the sensor is connected into the corresponding port of the wiring terminal, and then the switch is regulated to a relative state according to the type of the sensor, so that a loop formed by the conditioning circuit is adapted to the type of the sensor, the conditioning circuit can process various types of sensor signals to output voltage signals adapted to the same type of data acquisition card, and the circuit has the advantage of higher adaptability.
Preferably, when the sensor type is a two-wire external circuit passive current type output sensor, the signal acquisition is specifically performed by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact D;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
By adopting the technical scheme, the second resistor R2 is connected in series with the current closed loop, the voltage range of the partial voltage of the second resistor R2 can be obtained according to an ohm law formula, and the conditioning circuit is adapted to the passive current type output sensor of the two-wire system external circuit.
Preferably, when the sensor type is a voltage pulse type output sensor with a passive two-wire external circuit, the signal acquisition is specifically performed by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact D;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact B;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
By adopting the technical scheme, the first resistor R1 and the second resistor R2 are connected in series in the current closed loop, the voltage range of the partial voltage of the second resistor R2 can be obtained according to an ohm law formula, and the conditioning circuit is adapted to the passive voltage pulse type output sensor of the two-wire external circuit.
Preferably, when the sensor type is a voltage type output sensor with a passive three-wire system external circuit, the signal acquisition is specifically performed by the following method:
the sensor is connected with a positive power supply port V+ and a negative power supply port V-and a first signal port S1 respectively;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact E;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 2.
By adopting the technical scheme, the third resistor R3 and the fourth resistor R4 are connected in series in the current closed loop, and the voltage range of the voltage division of the fourth resistor R4 can be obtained according to an ohm law formula, so that the conditioning circuit is suitable for the passive voltage type output sensor of the three-wire system external circuit.
Preferably, when the sensor type is a two-wire external circuit active amperometric output sensor, the signal acquisition is specifically performed by:
the sensor is respectively connected with a positive power supply port V+ and a second signal port S2;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact C;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
By adopting the technical scheme, the second resistor R2 is connected in series with the current closed loop, the voltage range of the partial voltage of the second resistor R2 can be obtained according to an ohm law formula, and the conditioning circuit is adapted to the active current type output sensor of the two-wire system external circuit.
Preferably, when the sensor type is a two-wire external circuit active voltage type output sensor, signal acquisition is specifically performed by the following method:
the sensor is respectively connected with a positive power supply port V+ and a second signal port S2;
adjusting the single pole single throw switch SB3 to an open state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact C;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
By adopting the technical scheme, the current sensor is directly connected with the signal output end, so that the voltage type output sensor which is suitable for the two-wire system external circuit is used.
In a third aspect, the present application provides a signal acquisition box that adopts the following technical scheme:
a signal acquisition box comprising:
a case;
a panel mounted in the case;
several sets of signal conditioning circuits as described above are integrated on the panel.
By adopting the technical scheme, the sensor is connected with the wiring terminal in the conditioning circuit, so that signals of different types of sensors can be conditioned into a voltage range which can be acquired by the data acquisition card, and the sensor has the effects of convenience in carrying and flexibility in use.
Drawings
FIG. 1 is a schematic diagram of a signal conditioning circuit according to an embodiment of the present application;
FIG. 2 is a conditioning block diagram of a passive current output sensor of a two-wire external circuit corresponding to a conditioning circuit according to an embodiment of the present application;
FIG. 3 is a conditioning block diagram of a passive voltage pulse output sensor corresponding to a two-wire external circuit in accordance with one embodiment of the present application;
FIG. 4 is a conditioning block diagram of a passive voltage type output sensor of a three-wire system external circuit corresponding to a conditioning circuit according to an embodiment of the present application;
FIG. 5 is a conditioning block diagram of a two-wire external circuit active current type output sensor corresponding to a conditioning circuit according to an embodiment of the present application;
FIG. 6 is a conditioning block diagram of a two-wire external circuit active voltage type output sensor corresponding to a conditioning circuit according to an embodiment of the present application;
FIG. 7 is a block flow diagram of a signal conditioning method according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a signal collection box according to an embodiment of the present application.
Reference numerals illustrate: 1. a case; 2. a panel; 3. a needle bar bus head; 4. a delta socket; 5. touch screen industry tablet computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to fig. 1 to 8 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The embodiment of the application discloses a signal conditioning circuit. Referring to fig. 1, the signal conditioning circuit includes:
a DC power supply.
And the wiring terminal is coupled with the direct-current power supply and comprises a power positive electrode port V+ and a power negative electrode port V-.
The power negative terminal V-is connected to the negative terminal of the DC power supply.
A first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V+ of the power supply and the positive electrode of the direct-current power supply.
The movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the stationary contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V+ of the power supply, and the stationary contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1.
The two ends of the second resistor R2 are signal output ends.
In this embodiment, the direct current power supply is a 24V direct current power supply, the data acquisition card connected with the signal output end to acquire the conditioned sensor signal may be an NI9205 data acquisition card, an NI9206 data acquisition board card, a USB-6003 data acquisition board card, or the like, the resistance values of the first resistor R1 and the second resistor R2 are adjusted according to the range of the acquired signal of the adopted data acquisition card, and then the proportion of the partial pressure is adjusted, so that the conditioned sensor signal finally meets the acquisition range of the acquisition board card.
Based on the conditioned sensor signal output by the signal output end acquired by the NI9205 data acquisition card, in the embodiment, the resistance value of the first resistor R1 is 1KΩ, the resistance value of the second resistor R2 is 250 Ω, and the conditioning circuit of the embodiment can be applied to a current type output sensor with a passive two-wire external circuit and a voltage pulse type output sensor with a passive two-wire external circuit.
Referring to fig. 1 and 2, the passive current output sensor of the two-wire external circuit generally has a pressure sensor, a differential pressure sensor, a liquid level sensor, an electromagnetic flow sensor and the like, the output signal of the sensor is 4-20mA current signal, the passive current output sensor of the two-wire external circuit is correspondingly connected into a positive power supply port v+ and a negative power supply port V-, the conditioning circuit is realized by closing a fixed contact A of a movable contact of a single-pole double-throw switch SB1, a 250 Ω second resistor R2 is added in the two-wire circuit of the sensor, and two ends of the second resistor R2 are signal output ends connected with a collection port of an NI9205 data collection card according to ohm law: the current signals of 4mA, 250 omega and 1V are converted into voltage signals of 1-5V by the current type output sensor which is passive in a two-wire system and is output by the passive current type output sensor, and the voltage signals can be identified and collected by the NI9205 data collection card.
Referring to fig. 1 and 3, the passive voltage pulse type output sensor of the two-wire external circuit, such as a current meter, the signal of the current meter is characterized by switching value, the current meter can be switched on and off once every time the current meter rotates, and the current meter can be switched on and off twice or more, the number of times of switching in the circuit in unit time is identified, so that the revolution of the current meter can be calculated, the flow is calculated, the signal of the current meter belongs to the switching value, the high level=24V of the power supply of the direct current power supply, and the low level=0V of the circuit disconnection.
The voltage signal generated by the flow velocity meter is divided by the conditioning circuit, the movable contact of the single-pole double-throw switch SB1 is closed to the stationary contact B, the circuit of the output end of the flow velocity meter is connected in series with a second resistor R2 with the resistance of 250 omega and a first resistor R1 with the resistance of 1k omega, and the two ends of the second resistor R2 are signal output ends connected with the acquisition port of the NI9205 data acquisition card.
The high level signal of the current meter is divided into 4.8V voltage signals by a conditioning circuit, and the principle of a voltage dividing circuit is as follows: 24v×250/1250=4.8v, the low level signal is still 0V, and can be identified and collected by the NI9205 data collection card.
Some sensors are used under individual working conditions, and the phenomenon of overscan exists, under the phenomenon, the output of the sensor exceeds the maximum value, and in order to enable the acquisition range of the acquisition board card to completely cover the output signal range of the sensor, and the acquisition is left with allowance, the conditioning circuit converts the signal output by the sensor into a voltage signal in the range of 0-5V.
Referring to fig. 1, in an embodiment, a single-pole three-throw switch SB2 is coupled between the dc power supply and the second resistor R2, the movable contact of the single-pole three-throw switch SB2 is connected to the positive terminal of the dc power supply, the stationary contact C of the single-pole three-throw switch SB2 is turned off at rest, the stationary contact D of the single-pole three-throw switch SB2 is connected to the second resistor R2, and the stationary contact E of the single-pole three-throw switch SB2 is connected to the positive terminal v+ of the power supply.
The wiring terminal further comprises a first signal port S1 and a second signal port S2.
A third resistor R3 and a fourth resistor R4 are sequentially connected between the first signal port S1 and the stationary contact E of the single-pole three-throw switch SB 2.
A single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2.
The signal output end is connected with a double-pole double-throw switch SB4, the movable contact of the double-pole double-throw switch SB4 is connected with the signal output end, two stationary contacts of a stationary contact set 1 of the double-pole double-throw switch SB4 are respectively connected between a second resistor R2 and a single-pole double-throw switch SB1, a second signal port S2 and a single-pole single-throw switch SB3, and two stationary contacts of a stationary contact set 2 of the double-pole double-throw switch SB4 are respectively connected with two ends of a fourth resistor R4.
In this embodiment, through the single pole single throw switch SB3, the single pole double throw switch SB1, the double pole double throw switch SB4, and the single pole triple throw switch SB2 being snapped to the corresponding contacts, the sensor input signals of different analog signal types can be conditioned and converted into the voltage signals of the required range.
In this embodiment, the data acquisition card connected to the signal output end to acquire the conditioned sensor signal may also be an NI9205 data acquisition card, an NI9206 data acquisition board, a USB-6003 data acquisition board, or the like, where the resistance values of the first resistor R1 and the second resistor R2, the resistance values of the third resistor R3, and the fourth resistor R4 are adjusted according to the range of the acquired signal acquired by the data acquisition card, so as to adjust the ratio of the partial pressure, and finally make the conditioned sensor signal satisfy the acquisition range of the data acquisition card, and in this embodiment, the NI9205 data acquisition card is still adopted.
The resistance of the third resistor R3 is 2KΩ, the resistance of the fourth resistor R4 is 1KΩ, and the voltage signal output by the signal output end is adapted to all data acquisition cards with data acquisition range of + -10V by setting the resistance of the resistor.
Referring to fig. 1 and fig. 4, in an embodiment, the sensor is a passive voltage type output sensor of a three-wire external circuit, such as an eddy current probe sensor, a vibration sensor and the like, the signals output by the eddy current probe sensor and the vibration sensor are 0-15V voltage signals, which exceed the identification range of an NI9205 data acquisition card by ±10v, so that the voltage of the sensor is divided by a conditioning circuit, specifically, the sensor is connected to a power supply positive electrode port v+, a power supply negative electrode port V-and a first signal port S1, a single-pole single-throw switch SB3 is closed, a movable contact of a single-pole three-throw switch SB2 is closed with a fixed contact E thereof, a movable contact of the single-pole double-throw switch SB1 is closed with a fixed contact a thereof, a double-pole double-throw switch SB4 is closed with a fixed contact group 2 thereof, namely, a fourth resistor R4 with 1kΩ is added in series to the circuit of the first signal port S1 connected to the sensor, the voltage of the sensor is divided by a voltage of 1kΩ third resistor R3, and the sensor output signal is conditioned to be 0-5V voltage, and the principle is that the circuit is divided by the voltage signal: 15V x 1000/3000 = 5V, identifiable and collected by the NI9205 data collection card.
Referring to fig. 1 and 5, in an embodiment, when the type of the access sensor is active current type output of a two-wire external circuit, such as a power transmitter, an isolation module outputting current signals, and the like, the output signals of the power transmitter and the isolation module outputting the current signals are 4-20mA current signals, which cannot be directly identified and collected by an NI9205 data collection card, the specific implementation method of the conditioning circuit is that the sensor is connected to a positive electrode port v+ and a second signal port S2 of the power supply, a single-pole single-throw switch SB3 is closed, a movable contact of the single-pole three-throw switch SB2 is closed with a fixed contact C thereof, a movable contact of the single-pole double-throw switch SB1 is closed with a fixed contact a thereof, a double-pole double-throw switch SB4 is closed with a fixed contact set 1 thereof, i.e. 1250 Ω second resistor R2 is added in series on a circuit of the second signal port S2 connected to the sensor, so that the current signals of 4-20mA are converted into 1-5V voltage signals according to ohm law: 4ma×250Ω=1v, 20ma×250Ω=5v, can be identified and collected by NI9205 data collection card.
Referring to fig. 1 and 6, when the device type is a voltage type signal output device with a two-wire external circuit active, for example, an isolation module outputting a voltage signal, and the output voltage range of the isolation module outputting the voltage signal is 1-5V, the specific implementation manner of the regulating circuit is to connect the isolation module to the positive power supply port v+ and the second signal port S2, disconnect the single-pole single-throw switch SB3, close the movable contact of the single-pole three-throw switch SB2 with the stationary contact C thereof, close the movable contact of the single-pole double-throw switch SB1 with the stationary contact a thereof, and close the double-pole double-throw switch SB4 with the stationary contact set 1 thereof, so that the NI9205 data acquisition card acquires the voltage value of the isolation module outputting the voltage signal.
Referring to fig. 1 and 6, the embodiment further discloses a multifunctional signal conditioning method applied to hydraulic engineering field test, which includes:
and accessing the sensor to be acquired with data into a corresponding port of the wiring terminal.
And adjusting the switch to a corresponding state.
When the sensor type is a current type output sensor with a passive two-wire external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-.
The single pole single throw switch SB3 is adjusted to the closed state.
And regulating the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D.
And regulating the single-pole double-throw switch SB1 to close the movable contact and the fixed contact A.
The double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
When the sensor type is a voltage pulse type output sensor with a passive two-wire external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-.
The single pole single throw switch SB3 is adjusted to the closed state.
And regulating the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D.
And regulating the single-pole double-throw switch SB1 to close the movable contact and the stationary contact B.
The double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
When the sensor type is a voltage type output sensor with a passive three-wire system external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is connected with a positive power supply port V+ and a negative power supply port V-, and a first signal port S1 respectively.
The single pole single throw switch SB3 is adjusted to the closed state.
And regulating the single-pole three-throw switch SB2 to close the movable contact and the fixed contact E.
And regulating the single-pole double-throw switch SB1 to close the movable contact and the fixed contact A.
The double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 2.
When the sensor type is a two-wire external circuit active current type output sensor, the signal acquisition is specifically performed by the following method:
the sensors are respectively connected with a positive power supply port V+ and a second signal port S2.
The single pole single throw switch SB3 is adjusted to the closed state.
And regulating the single-pole three-throw switch SB2 to close the movable contact and the stationary contact C.
And regulating the single-pole double-throw switch SB1 to close the movable contact and the fixed contact A.
The double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
When the sensor type is a voltage type output sensor with a two-wire external circuit active, the signal acquisition is specifically performed by the following method:
the sensors are respectively connected with a positive power supply port V+ and a second signal port S2.
The single pole single throw switch SB3 is adjusted to the open state.
And regulating the single-pole three-throw switch SB2 to close the movable contact and the stationary contact C.
And regulating the single-pole double-throw switch SB1 to close the movable contact and the fixed contact A.
The double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
The embodiment also discloses a signal acquisition box, the signal acquisition box includes: the signal conditioning circuit comprises a box body 1, a panel 2 arranged in the box body 1 and a plurality of groups of signal conditioning circuits integrated on the panel 2.
In theory, the number of the signal conditioning circuits arranged on the panel 2 can be infinitely increased, but in practice, the requirements of users are considered and the light portability of the equipment is considered, so in the embodiment, the signal conditioning circuits are provided with 32 groups in total so as to adapt to an NI9205 data acquisition card with 32 channels, the NI9205 data acquisition card needs to be connected with a notebook computer, various different sensor signals are uniformly conditioned and converted into voltage signals which can be recognized and collected by the NI9205 data acquisition card through the conditioning circuits, the signals are uniformly transmitted to the NI9205 data acquisition card, finally the conditioning signals of all the sensors are transmitted to the notebook computer through internal analog-digital conversion, and the notebook computer performs final signal storage and oscillometric display.
The panel 2 is provided with a needle-row bus head 3, the needle-row bus head 3 is correspondingly connected with a signal output end of the conditioning circuit, and the needle-row bus head 3 is used for being externally connected with a data acquisition card and transmitting voltage signals conditioned and converted by the conditioning circuit to the data acquisition card.
Optionally, a touch screen industrial tablet computer 5 is further installed on the inner side of the box, when sensor signals are collected and displayed, a USB data line is adopted to connect a data collection card to the touch screen industrial tablet computer 5, collection analysis software is installed in the touch screen industrial tablet computer 5 in advance, and the received conditioned sensor signals are analyzed, processed and displayed through the collection analysis software.
In this embodiment, the size of the touch screen industrial tablet computer 5 is 10 inches considering the practical use condition and portability, but in practical use, different sizes can be replaced according to practical requirements.
The panel 2 is provided with a delta socket 4, 220V alternating current is connected to supply power to a direct current power supply through the delta socket 4, a direct current voltmeter is connected between the positive end and the negative end of the direct current power supply and is used for displaying the voltage of the output end of the direct current power supply, a metal button switch S1 is arranged among a zero line, a fire wire and the direct current power supply of the delta socket 4, and a metal button switch S2 is arranged among the positive end, the negative end and the two ends of the direct current voltmeter of the direct current power supply, and in the embodiment, the direct current voltmeter has the following functions:
(1) The direct-current voltmeter is used for monitoring whether the direct-current power supply normally outputs 24V power supply, if the metal button switch S2 is pressed, the direct-current voltmeter displays 24V, which indicates that the direct-current power supply works normally, and if the direct-current power supply displays 0, which indicates that the 24V direct-current power supply works abnormally.
(2) When the external sensor needs the direct current power supply to work, the direct current power supply is turned off in the process of debugging the sensor or wiring the sensor, and the direct current voltmeter is used for displaying the power supply state of the external sensor so as to confirm the power supply state of the direct current power supply when the sensor is operated.
(3) When the externally connected sensor is short-circuited or the load of the external sensor is too high, the output voltage of the direct current power supply is reduced, the direct current voltage representation number is far lower than 24V, and a user judges whether the external input has the conditions of short circuit of the sensor and too high load of the sensor through the direct current voltage representation number.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
Claims (9)
1. A signal conditioning circuit, comprising:
a direct current power supply;
the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V+ and a power supply negative electrode port V-;
the power supply negative electrode port V-is connected with the negative electrode end of the direct current power supply;
a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V+ of the power supply and the positive electrode of the direct-current power supply;
the movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the fixed contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V+ of the power supply, and the fixed contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1;
two ends of the second resistor R2 are signal output ends;
a single-pole three-throw switch SB2 is coupled between the direct-current power supply and the second resistor R2, a movable contact of the single-pole three-throw switch SB2 is connected with the positive end of the direct-current power supply, a static contact C of the single-pole three-throw switch SB2 is disconnected in an empty mode, a static contact D of the single-pole three-throw switch SB2 is connected with the second resistor R2, and a static contact E of the single-pole three-throw switch SB2 is connected with a positive end port V+ of the power supply;
the wiring terminal also comprises a first signal port S1 and a second signal port S2;
a third resistor R3 and a fourth resistor R4 are sequentially connected between the first signal port S1 and a fixed contact E of the single-pole three-throw switch SB 2;
a single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2;
the signal output end is connected with a double-pole double-throw switch SB4, the movable contact of the double-pole double-throw switch SB4 is connected with the signal output end, two stationary contacts of a stationary contact set 1 of the double-pole double-throw switch SB4 are respectively connected between a second resistor R2 and a single-pole double-throw switch SB1, a second signal port S2 and a single-pole single-throw switch SB3, and two stationary contacts of a stationary contact set 2 of the double-pole double-throw switch SB4 are respectively connected with two ends of a fourth resistor R4.
2. The signal conditioning circuit according to claim 1, wherein the dc power supply is a 24V dc power supply, the resistance of the first resistor R1 is 1kΩ, and the resistance of the second resistor R2 is 250 Ω; the resistance value of the third resistor R3 is 2KΩ, and the resistance value of the fourth resistor R4 is 1KΩ.
3. Signal conditioning method for signal conditioning using a signal conditioning circuit according to any of claims 1-2, characterized in that it comprises the steps of:
accessing a sensor of data to be acquired to a corresponding port of the wiring terminal;
and adjusting the switch to a corresponding state.
4. A signal conditioning method according to claim 3, wherein,
when the sensor type is a current type output sensor with a passive two-wire external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact D;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
5. A signal conditioning method according to claim 3, wherein,
when the sensor type is a voltage pulse type output sensor with a passive two-wire external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is respectively connected with a positive power supply port V+ and a negative power supply port V-;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact D;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact B;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
6. A signal conditioning method according to claim 3, wherein,
when the sensor type is a voltage type output sensor with a passive three-wire system external circuit, the signal acquisition is specifically carried out by the following method:
the sensor is connected with a positive power supply port V+ and a negative power supply port V-and a first signal port S1 respectively;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact E;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 2.
7. A signal conditioning method according to claim 3, wherein,
when the sensor type is a two-wire external circuit active current type output sensor, the signal acquisition is specifically performed by the following method:
the sensor is respectively connected with a positive power supply port V+ and a second signal port S2;
adjusting the single pole single throw switch SB3 to a closed state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact C;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
8. A signal conditioning method according to claim 3, wherein,
when the sensor type is a voltage type output sensor with a two-wire external circuit active, the signal acquisition is specifically performed by the following method:
the sensor is respectively connected with a positive power supply port V+ and a second signal port S2;
adjusting the single pole single throw switch SB3 to an open state;
the single-pole three-throw switch SB2 is regulated to be closed to the movable contact and the fixed contact C;
the single-pole double-throw switch SB1 is regulated to be closed to the movable contact and the fixed contact A;
the double pole double throw switch SB4 is adjusted to close the movable contact group and the stationary contact group 1.
9. A signal acquisition box, comprising:
a case (1);
a panel (2) mounted in the case (1);
a number of sets of signal conditioning circuits as claimed in any one of the preceding claims 1-2 integrated on a panel (2).
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