CN220022784U - Industrial analog quantity acquisition circuit - Google Patents
Industrial analog quantity acquisition circuit Download PDFInfo
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- CN220022784U CN220022784U CN202321345292.3U CN202321345292U CN220022784U CN 220022784 U CN220022784 U CN 220022784U CN 202321345292 U CN202321345292 U CN 202321345292U CN 220022784 U CN220022784 U CN 220022784U
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Abstract
The utility model belongs to the technical field of industrial signal acquisition, and discloses an industrial analog acquisition circuit, the device comprises a front-end voltage following unit, a voltage acquisition unit, a current acquisition unit and a change-over switch unit; the front-end voltage following unit comprises a sampling circuit and a voltage follower, and is used for converting a current signal into 0-1V voltage and carrying out primary voltage following on the acquired voltage; the utility model can simultaneously meet the requirements of various analog quantities of industrial field devices, including 0-20mA, 4-20mA, 0-10V and acquisition and conditioning of signals of minus 10V to plus 10V, the acquisition equipment for purchasing and implementing different signals by a user is not needed, wiring and implementation difficulty of an industrial field are greatly reduced, manual intervention is not needed, analog quantity types are not needed to be selected, and hardware cost and development difficulty of the user are saved.
Description
Technical Field
The utility model relates to the technical field of industrial signal acquisition, in particular to an industrial analog acquisition circuit.
Background
In industrial control sites, such as power plants, steel plants, automobile assembly work, etc., to connect status signals such as temperature, pressure, humidity, etc. at the site to the control management room, analog signals are required to transmit the signals. Industrial analog quantity acquisition is a process of converting an actual physical quantity into a digital signal, mainly comprises a sensor technology, a signal conditioning technology and an analog-to-digital conversion technology. The current internationally standard use scene is that the sensors of temperature, humidity, pressure and the like of the industrial site convert the corresponding states into analog current signals of 4-20mA or analog voltage signals of-10V to +10V, and the systems of DCS, PLC and the like positioned at the middle positions of the industrial site and the control room convert the voltage current signals into digital signals through the current signal acquisition device and upload the digital signals to the control room through the industrial communication bus so as to carry out subsequent monitoring and management work.
Because analog quantity signals are of several types, namely 0-20mA, 4-20mA, 0-10V and-10V to +10V, the traditional analog quantity acquisition circuit generally only acquires specific analog quantities or physically integrates current and voltage on one module, so that the integration level in the aspect of acquisition types in the traditional design is low, different analog quantities are required to be prepared into unused acquisition equipment, the types of the existing analog quantity input expansion modules are various, the universality among the types is little, inconvenience is brought to users in application selection, spare part selection and purchase, different acquisition modules are required to be equipped for acquiring different analog quantities, and spare parts are required to be purchased by important model modules, thereby increasing the cost and wasting resources.
Disclosure of Invention
In order to solve the problems, the utility model provides an industrial analog quantity acquisition circuit which is used for an industrial site to acquire all analog quantity signals, does not need manual intervention to select analog quantity types, and saves hardware cost and development difficulty of users.
The utility model provides an industrial analog quantity acquisition circuit which adopts the following technical scheme:
an industrial analog quantity acquisition circuit comprises a front-end voltage following unit, a voltage acquisition unit, a current acquisition unit and a change-over switch unit; the front-end voltage following unit comprises a sampling circuit and a voltage follower, and is used for converting a current signal into 0-1V voltage and carrying out primary voltage following on the acquired voltage; the voltage acquisition unit comprises an adder, and is used for converting the acquired voltage range from-10V to +10V to 0-5V voltage and sending the voltage to the change-over switch circuit; the current acquisition unit comprises a negative feedback operational amplifier and is used for amplifying the voltage of 0-1V converted by the sampling circuit by 5 times and sending the amplified voltage to the change-over switch unit; the change-over switch unit comprises at least one analog switch chip U1 and is used for sending the voltage acquisition signal and the current acquisition signal into the ADC sampling pin in a time sharing way.
Further, the sampling circuit comprises an N-type MOS transistor Q1, a resistor R1 and a resistor R2 are connected in parallel between the drain electrode of the N-type MOS transistor Q1 and the signal input end, the gate electrode of the N-type MOS transistor Q1 is connected with the drive control pin, and the source electrode of the N-type MOS transistor Q1 is grounded.
Further, the signal input end of the voltage follower is grounded through a resistor R3.
Through the technical scheme, when the acquisition type is the current signal, the system can open the N-type MOS tube Q1 to form a 50R sampling loop through two resistors R1 and R2, and convert the 0-20mA current signal into a 0-1V voltage signal; the voltage signal is sent into the back-end circuit after passing through the primary voltage follower, and through the arrangement of the voltage follower, the problem that the port has floating voltage when no input signal is input into the system is solved, and the port resistor is clamped at 0V by using the R3 pull-down resistor.
Furthermore, the voltage acquisition unit further comprises a P-type MOS tube Q2, a source electrode of the P-type MOS tube Q2 is connected with a reference voltage, and a drain electrode of the P-type MOS tube Q2 and an input end of the adder are connected with a voltage input pin.
Further, an NPN type triode Q3 is further disposed between the gate of the P type MOS transistor Q2 and the drive control pin, a collector of the NPN type triode Q3 is connected to the gate of the P type MOS transistor Q2, a base of the NPN type triode Q3 is connected to the drive control pin, and an emitter of the NPN type triode Q3 is grounded.
Through the technical scheme, when the acquisition type is the voltage signal, the system can open the P-type MOS tube Q2, add the reference voltage 10V and the acquisition voltage, and convert the acquisition voltage range from-10V to +10V into 0-5V, so as to solve the problems of negative pressure acquisition and limited acquisition range of the rear-end ADC.
Further, the current acquisition unit further comprises a P-type MOS tube Q4, a source electrode of the P-type MOS tube Q4 is connected with an output end of the negative feedback operational amplifier, a drain electrode of the P-type MOS tube Q4 is connected with a signal output end of the current acquisition unit, an NPN-type triode Q5 is further arranged between a grid electrode of the P-type MOS tube Q4 and a driving control pin, a collector electrode of the NPN-type triode Q5 is connected with the grid electrode of the P-type MOS tube Q4, a base electrode of the NPN-type triode Q5 is connected with the driving control pin, and an emitter electrode of the NPN-type triode Q5 is grounded.
Through the technical scheme, the current signal 0-1V passing through the sampling loop is amplified by 5 times of the amplifying circuit and then converted into the voltage 0-5V, when the acquisition type of the current signal is the current signal, the system can open the P-type MOS tube Q4 so as to prevent the saturated output of the operational amplifier from damaging a rear-end device when the signal source is the voltage (-10V to +10V).
In summary, the present utility model includes at least one of the following beneficial technical effects:
the utility model can simultaneously meet various analog quantities of industrial field devices, including acquisition and conditioning of signals of 0-20mA, 4-20mA, 0-10V and-10V to +10V, does not need acquisition equipment for purchasing and implementing different signals by users, greatly reduces wiring and implementation difficulties of industrial fields, does not need manual intervention to select analog quantity types, and saves hardware cost and development difficulty of users.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of the present utility model;
FIG. 2 is a front end voltage follower cell circuit diagram;
FIG. 3 is a circuit diagram of a voltage acquisition unit;
FIG. 4 is a circuit diagram of a current collection unit;
fig. 5 is a circuit diagram of a change-over switch unit.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present utility model are within the protection scope of the present utility model.
In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1:
the utility model is described in further detail below with reference to fig. 1-5.
The embodiment of the utility model discloses an industrial analog quantity acquisition circuit which comprises a front-end voltage following unit, a voltage acquisition unit, a current acquisition unit and a change-over switch unit; the front-end voltage following unit comprises a sampling circuit and a voltage follower, and is used for converting a current signal into 0-1V voltage and carrying out primary voltage following on the acquired voltage; the voltage acquisition unit comprises an adder, and is used for converting the acquired voltage range from-10V to +10V into 0-5V voltage and sending the voltage to the change-over switch circuit; the current acquisition unit comprises a negative feedback operational amplifier and is used for amplifying the voltage of 0-1V converted by the sampling circuit by 5 times and sending the amplified voltage into the change-over switch unit; the change-over switch unit comprises an analog switch chip U1, the model is TS5A3159, and the change-over switch unit is used for sending the voltage acquisition signal and the current acquisition signal into an ADC sampling pin in a time-sharing way.
Referring to fig. 2, the sampling circuit includes an N-type MOS transistor Q1, a resistor R1 and a resistor R2 are connected in parallel between the drain of the N-type MOS transistor Q1 and the signal input end, the gate of the N-type MOS transistor Q1 is connected to the driving control pin, and the source of the N-type MOS transistor Q1 is grounded. The signal input end of the voltage follower is grounded through a resistor R3. When the collection type is current signals, the system can open an N-type MOS tube Q1 to form a 50R sampling loop through two resistors R1 and R2, and convert 0-20mA current signals into 0-1V voltage signals; the voltage signal is sent into the back-end circuit after passing through the primary voltage follower, and through the arrangement of the voltage follower, the problem that the port has floating voltage when no input signal is input into the system is solved, and the port resistor is clamped at 0V by using the R3 pull-down resistor.
Referring to fig. 3, the voltage collecting unit further includes a P-type MOS transistor Q2, a source of the P-type MOS transistor Q2 is connected to a reference voltage, and a drain of the P-type MOS transistor Q2 and an input terminal of the adder are both connected to a voltage input pin. An NPN triode Q3 is further arranged between the grid electrode of the P-type MOS tube Q2 and the driving control pin, the collector electrode of the NPN triode Q3 is connected with the grid electrode of the P-type MOS tube Q2, the base electrode of the NPN triode Q3 is connected with the driving control pin, and the emitter electrode of the NPN triode Q3 is grounded. When the collection type is voltage signals, the system can open the P-type MOS tube Q2, add the reference voltage 10V and the collection voltage, and convert the collection voltage range from-10V to +10V to 0-5V, so as to solve the problem of the limited collection range of the negative pressure collection and the back-end ADC.
Referring to fig. 4, the current collecting unit further includes a P-type MOS transistor Q4, a source of the P-type MOS transistor Q4 is connected to an output end of the negative feedback operational amplifier, a drain of the P-type MOS transistor Q4 is connected to a signal output end of the current collecting unit, an NPN transistor Q5 is further disposed between a gate of the P-type MOS transistor Q4 and the driving control pin, a collector of the NPN transistor Q5 is connected to the gate of the P-type MOS transistor Q4, a base of the NPN transistor Q5 is connected to the driving control pin, and an emitter of the NPN transistor Q5 is grounded. The current signal 0-1V passing through the sampling loop is amplified by 5 times of the amplifying circuit and then converted into 0-5V voltage, when the acquisition type is the current signal, the system can open the P-type MOS transistor Q4 so as to prevent the saturated output of the operational amplifier from damaging the rear-end device when the signal source is the voltage (-10V to +10V).
Referring to fig. 5, the system may select a conversion channel according to input types of different signals, and input the signals to the ADC chip for sampling. Since the ADC chip is generally expensive and the port can only exist in one model type at a time, a single analog electronic switch chip is preferred in this embodiment to switch the input source of the pins of the ADC chip, so that the purpose of cost saving is achieved.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (6)
1. The industrial analog quantity acquisition circuit is characterized by comprising a front-end voltage following unit, a voltage acquisition unit, a current acquisition unit and a change-over switch unit; the front-end voltage following unit comprises a sampling circuit and a voltage follower, and is used for converting a current signal into 0-1V voltage and carrying out primary voltage following on the acquired voltage; the voltage acquisition unit comprises an adder, and is used for converting the acquired voltage range from-10V to +10V to 0-5V voltage and sending the voltage to the change-over switch circuit; the current acquisition unit comprises a negative feedback operational amplifier and is used for amplifying the voltage of 0-1V converted by the sampling circuit by 5 times and sending the amplified voltage to the change-over switch unit; the change-over switch unit comprises at least one analog switch chip U1 and is used for sending the voltage acquisition signal and the current acquisition signal into the ADC sampling pin in a time sharing way.
2. An industrial analog acquisition circuit according to claim 1, wherein: the sampling circuit comprises an N-type MOS tube Q1, a resistor R1 and a resistor R2 are connected in parallel between the drain electrode of the N-type MOS tube Q1 and the signal input end, the grid electrode of the N-type MOS tube Q1 is connected with a drive control pin, and the source electrode of the N-type MOS tube Q1 is grounded.
3. An industrial analog acquisition circuit according to claim 2, wherein: the signal input end of the voltage follower is grounded through a resistor R3.
4. An industrial analog acquisition circuit according to claim 1, wherein: the voltage acquisition unit further comprises a P-type MOS tube Q2, a source electrode of the P-type MOS tube Q2 is connected with a reference voltage, and a drain electrode of the P-type MOS tube Q2 and an input end of the adder are connected with a voltage input pin.
5. The industrial analog acquisition circuit of claim 4 wherein: an NPN triode Q3 is further arranged between the grid electrode of the P-type MOS tube Q2 and the driving control pin, the collector electrode of the NPN triode Q3 is connected with the grid electrode of the P-type MOS tube Q2, the base electrode of the NPN triode Q3 is connected with the driving control pin, and the emitter electrode of the NPN triode Q3 is grounded.
6. An industrial analog acquisition circuit according to claim 1, wherein: the current acquisition unit further comprises a P-type MOS tube Q4, a source electrode of the P-type MOS tube Q4 is connected with an output end of the negative feedback operational amplifier, a drain electrode of the P-type MOS tube Q4 is connected with a signal output end of the current acquisition unit, an NPN-type triode Q5 is further arranged between a grid electrode of the P-type MOS tube Q4 and a driving control pin, a collector electrode of the NPN-type triode Q5 is connected with a grid electrode of the P-type MOS tube Q4, a base electrode of the NPN-type triode Q5 is connected with the driving control pin, and an emitter electrode of the NPN-type triode Q5 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321345292.3U CN220022784U (en) | 2023-05-30 | 2023-05-30 | Industrial analog quantity acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321345292.3U CN220022784U (en) | 2023-05-30 | 2023-05-30 | Industrial analog quantity acquisition circuit |
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| Publication Number | Publication Date |
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| CN220022784U true CN220022784U (en) | 2023-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321345292.3U Active CN220022784U (en) | 2023-05-30 | 2023-05-30 | Industrial analog quantity acquisition circuit |
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| CN (1) | CN220022784U (en) |
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- 2023-05-30 CN CN202321345292.3U patent/CN220022784U/en active Active
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