CN113324677A - Intelligent thermocouple control circuit - Google Patents
Intelligent thermocouple control circuit Download PDFInfo
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- CN113324677A CN113324677A CN202110537948.0A CN202110537948A CN113324677A CN 113324677 A CN113324677 A CN 113324677A CN 202110537948 A CN202110537948 A CN 202110537948A CN 113324677 A CN113324677 A CN 113324677A
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- 238000004891 communication Methods 0.000 claims abstract description 69
- 238000002955 isolation Methods 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 54
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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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
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention discloses an intelligent thermocouple control circuit, which relates to the technical field of temperature detection control and comprises a signal acquisition circuit, a signal processing circuit, a main control circuit, an isolation control circuit and a communication circuit; the signal acquisition circuit is used for acquiring an electromotive force signal output by the thermocouple and filtering out a WIFI signal and high-frequency noise of a mobile phone signal; the signal processing circuit is used for converting the electromotive force signal into a digital signal and performing cold junction compensation on the thermocouple; the main control circuit is used for receiving and storing the acquired digital signals and controlling the isolation control circuit to work and communicate. The intelligent thermocouple control circuit adopts the distributed thermocouples to carry out multi-aspect acquisition, effectively filters, compensates and converts the acquired signals, improves the detection precision of the thermocouples, strengthens the acquisition of the signals, eliminates the interference between circuits through isolation control, has a wireless real-time monitoring function, and is more intelligent in thermocouple control.
Description
Technical Field
The invention relates to the technical field of temperature detection and control, in particular to an intelligent thermocouple control circuit.
Background
With the development of industry and the improvement of social productivity, a plurality of large-scale high-temperature devices are widely applied in various fields, the temperature is one of the most common parameters in industrial production, the temperature has no influence on the efficiency of industrial production and the safety of circuits, the real-time acquisition and high-precision real-time monitoring of the temperature have important significance for the application in various fields, wherein, the thermocouple has good application in the high temperature detection field, but the temperature of the cold end (reference end) of the thermocouple sensor is constant, which directly influences the measurement precision of the thermocouple, in order to better detect the temperature and not be influenced by the environmental factors such as air pressure, temperature control is necessary for the cold end of the thermocouple, and the additional addition of a protection circuit in the thermocouple control circuit increases the volume of the circuit, meanwhile, the functions of signal processing and wireless communication of the thermocouple temperature acquisition signals are also to be optimized.
Disclosure of Invention
The embodiment of the invention provides an intelligent thermocouple control circuit to solve the problems in the background technology.
According to a first aspect of embodiments of the present invention, there is provided an intelligent thermocouple control circuit, including: the device comprises a signal acquisition circuit, a signal processing circuit, a main control circuit, an isolation control circuit and a communication circuit;
the signal acquisition circuit is used for acquiring electromotive force signals output by the thermocouple in multiple directions and filtering high-frequency noise of WIFI signals and mobile phone signals;
the signal processing circuit is used for converting the electromotive force signal acquired by the signal acquisition circuit into a digital signal and performing cold junction compensation on the thermocouple;
the main control circuit is used for receiving the digital signal output by the signal processing circuit; the digital signal processing circuit is used for storing the digital signal output by the signal processing circuit; the isolation control circuit is used for controlling the isolation control circuit to work; for transmitting a digital signal to the communication circuit;
the isolation control circuit is used for isolating the output signal of the main control circuit and performing overvoltage short-circuit protection on the circuit;
and the communication circuit is used for carrying out multipoint distributed communication on the digital signals acquired by the main control circuit.
Compared with the prior art, the invention has the beneficial effects that: the intelligent thermocouple control circuit adopts the distributed thermocouples to carry out multi-aspect acquisition, effectively filters, compensates and converts the acquired signals, improves the detection precision of the thermocouples, strengthens the acquisition of the signals, eliminates the interference between circuits through isolation control, has a wireless real-time monitoring function, and is more intelligent in thermocouple control.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an intelligent thermocouple control circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of an intelligent thermocouple control circuit provided by an embodiment of the invention.
Fig. 3 is a schematic block diagram of a communication circuit according to an embodiment of the present invention.
Fig. 4 is a communication circuit diagram provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an intelligent thermocouple control circuit, including: the device comprises a signal acquisition circuit 1, a signal processing circuit 2, a main control circuit 3, an isolation control circuit 4, a communication circuit 5 and a field display and keyboard circuit 6;
specifically, the signal acquisition circuit 1 is used for acquiring an electromotive force signal output by the thermocouple TC; the first end of the signal acquisition circuit 1 is connected with a thermocouple TC;
the signal processing circuit 2 is used for converting the electromotive force signals collected by the signal collecting circuit 1 into digital signals; the first end of the signal processing circuit 2 is connected with the second end of the signal acquisition circuit 1;
a main control circuit 3 for receiving the digital signal output by the signal processing circuit 2; for storing the digital signal output by the signal processing circuit 2; the isolation control circuit 4 is used for controlling the operation of the isolation control circuit; for transmitting digital signals to the communication circuit 5; the first end of the main control circuit 3 is connected with the second end of the signal processing circuit 2;
the isolation control circuit 4 is used for carrying out isolation control on the main control circuit 3 and a load; the first end of the isolation control circuit 4 is connected with the second end of the main control circuit 3, and the second end of the isolation control circuit 4 is connected with a load;
the communication circuit 5 is used for carrying out multipoint distributed communication on the digital signals acquired by the main control circuit 3; the communication circuit is connected with a third end of the main control circuit 3;
the field display and keyboard circuit 6 is used for displaying the digital signal output by the signal processing circuit 2 and controlling the work of the isolation control circuit 4 on the field; the field display and keyboard circuit 6 is connected with the fourth end of the main control circuit 3.
In a specific embodiment, in the signal acquisition circuit 1, an RFI filter may be used to process the sampled data, or two symmetrical first-order RC filter circuits may be used to form the signal acquisition circuit, so as to eliminate high-frequency noise picked up by the thermocouple TC when acquiring the temperature; the signal processing circuit 2 can adopt a thermocouple TC digital conversion chip which is specially used for realizing the signal conversion and cold end compensation functions for the thermocouple TC, and can also form cold end compensation and an analog-to-digital converter through a temperature sensor and an operational amplifier, so that the analog quantity acquired by the thermocouple TC is converted into the digital quantity, and the digital quantity is conveniently received by the main control circuit 3; the main control circuit 3 may adopt a single chip or a Central Processing Unit (CPU) to receive a digital signal from the circuit and control the operation of the isolation control circuit; the isolation control circuit 4 controls the switch tube by using the isolator so as to control the on/off of the circuit, wherein the switch tube can be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or a triode, and the switch tube outputs a control signal through the main control circuit to control the on/off of the isolator so as to control the on/off of the switch tube; the communication circuit 5 adopts a multi-node communication mode, and CAN adopt a ZIGBEE communication or CAN (Controller Area Network) bus mode, and performs wireless distributed acquisition on the digital signal by using a ZIGBEE communication or CAN communication node; the on-site display and keyboard circuit 6 is monitored by an upper computer, which is not described herein.
Example 2: based on embodiment 1, please refer to fig. 2, in an embodiment of the intelligent thermocouple control circuit according to the present invention, the signal acquisition circuit 1 includes a thermocouple TC, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, and a third capacitor C3;
specifically, a first end of the thermocouple TC is connected to a first end of the first capacitor C1 and a first end of the third capacitor C3 through the first resistor R1, a second end of the thermocouple TC is connected to a first end of the second resistor R2 and a first end of the third resistor R3, a second end of the second resistor R2 is connected to a second end of the first capacitor C1 and a first end of the second capacitor C2, and a second end of the third resistor R3 is grounded, a second end of the second capacitor C2 and a second end of the third capacitor C3.
Further, the signal processing circuit 2 comprises a first converter U2, a fourth capacitor C4 and a first voltage source + 5V; the main control circuit 3 includes a first control chip U1;
specifically, a first end of the first converter U2 is connected to ground and a second end of the fourth capacitor C4, a second end of the first converter U2 is connected to a second end of the first capacitor C1, a third end of the first converter U2 is connected to a first end of the first capacitor C1, a fourth end of the first converter U2 is connected to a first end of the fourth capacitor C4 and the first voltage source +5V, and a fifth end, a sixth end and a seventh end of the first converter U2 are connected to the IO port of the first control chip U1.
Further, the isolation control circuit 4 includes a fourth resistor R4, a fifth resistor R5, a first isolator U3, a second isolator U4, a sixth resistor R6, a seventh resistor R7, and a switch control circuit 401;
specifically, the switch control circuit 401 is configured to control conduction of a switch tube in the circuit; the circuit is used for reducing the loss of equipment and playing a role in circuit protection;
the first end of the fourth resistor R4 is connected to the first end of the first isolator U3, the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are connected to the IO port of the first control chip U1, the second end of the first isolator U3 is grounded and the second end of the second isolator U4, the third end of the first isolator U3 is connected to the first voltage source +5V and the third end of the second isolator U4, the fourth end of the first isolator U3 is connected to the first end of the sixth resistor R6, the first end of the second isolator U4 is connected to the first end of the fifth resistor R5, the fourth end of the second isolator U4 is connected to the first end of the seventh resistor R7, and the second end of the sixth resistor R6 and the second end of the seventh resistor R7 are connected to the switch control circuit 401.
Further, the switch control circuit 401 includes an eighth resistor R8, a ninth resistor R9, a first switch tube M1, and a second switch tube M2;
specifically, a first end of the eighth resistor R8 is connected to the second end of the sixth resistor R6 and the first end of the first switch tube M1, a second end of the eighth resistor R8 is grounded, a second end of the ninth resistor R9, a second end of the first switch tube M1 and a second end of the second switch tube M2, and a first end of the ninth resistor R9 is connected to the second end of the seventh resistor R7 and the first end of the second switch tube M2.
In a specific embodiment, the first voltage source can be obtained by using a 5V voltage stabilizer, the input voltage is converted into the required voltage by using a voltage stabilizer with known output, the output voltage is stable, and no extra peripheral components are needed; the thermocouple TC can adopt a K-type thermocouple TC, a J-type thermocouple TC, an N-type thermocouple TC, a T-type thermocouple TC or an E-type thermocouple TC, and the first conversion chip U2 is utilized to fully enable the type selection of the thermocouple TC to be more free; the first converter U2 can adopt MAX31855 thermocouple TC output converter, also can adopt MAX6675 converter, all of which are integrated circuits with greatly reduced volume and improved working precision; the first control chip U1 can adopt an STM32 series single-chip microcomputer or an AT89S52 single-chip microcomputer, and control functions can be diversified through an autonomous programming software system; the first isolator U3 and the second isolator U4 may be implemented by using a photoelectric coupler, so that isolation control is realized to avoid interference between circuits.
Example 3: on the basis of embodiment 1, please refer to fig. 3 and 4, in an embodiment of the intelligent thermocouple control circuit according to the present invention, the communication circuit 5 includes a communication terminal node 501, a communication coordination module 502, and a wireless communication serial port module 503;
specifically, a communication terminal node 501 for receiving data output by the main control circuit 3;
a communication coordination module 502, configured to connect the communication terminal node 501 with the wireless communication serial port module 503 to transmit data;
a wireless communication serial port module 503, configured to connect to a wireless communication device;
a first end of the communication terminal node 501 is connected to the communication end of the first control chip U1, a second end of the communication terminal node 501 is connected to a first end of the communication coordination module 502, and a second end of the communication coordination module 502 is connected to the wireless communication serial port module.
Further, the end node includes a first communication chip U5; the communication coordination module 502 includes a first gateway coordinator U6, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a second voltage source + 3.3V; the wireless communication serial port module 503 comprises a first serial interface U7;
specifically, the second end of the first gateway coordinator U6 is connected to the second voltage source +3.3V through a sixth capacitor C6, the tenth end of the first gateway coordinator U6 and a seventh capacitor C7, the first end of the first gateway coordinator U6 is connected to the third end of the first gateway coordinator U6 through a fourth capacitor C4, the fourth end of the first gateway coordinator U6 is connected to the fifth end of the first gateway coordinator U6 through a fifth capacitor C5, the sixth end of the first gateway coordinator U6 is connected to the ground end and the other end of the seventh capacitor C7 through an eighth capacitor C8, the seventh end and the eighth end of the first gateway coordinator U6 are connected to the IO port of the first communication chip U5, and the ninth end and the tenth end of the first gateway coordinator U6 are connected to the first serial interface U7.
In a specific embodiment, a plurality of communication terminal nodes 501 can be added according to the needs of users, the sampling range of the thermocouple TC is increased, and meanwhile, sequencing statistics is intelligently performed on sampled digital values, wherein ZIGBEE communication is adopted; the first communication chip U5 adopts CC2530 or CC2430, and both are ZIGBEE communication special chips; the first gateway coordinator U6 may select a MAX3232 chip or a SP3232 chip, so as to enhance the interaction capability of the ZIGBEE communication and wireless communication serial port module 503, and avoid data loss; the first serial interface U7 selects a USB connector as a data interface to perform data connection with the wireless communication device, and can connect RS (Recommended standard) communication and GPRS (General packet radio service) communication.
In the embodiment of the invention, a target is subjected to real-time temperature acquisition through a thermocouple TC, high-frequency noise picked up by the thermocouple TC during temperature acquisition is eliminated through a signal acquisition circuit 1, the accuracy of temperature acquisition is improved, an analog signal is converted into a digital signal through a signal processing circuit 2 by the acquired temperature signal, cold junction compensation is carried out on the thermocouple TC, the temperature difference phenomenon of the thermocouple TC is avoided, linear correction is carried out on the temperature and the thermal potential of the thermocouple TC, finally, the digital signal is transmitted to a main control module, data storage is carried out through an internal memory of the main control module and is transmitted to a field display and keyboard circuit 6 for field data monitoring, the data is transmitted to a communication circuit 5 for remote monitoring, when the temperature exceeds or is lower than an internal set value of the main control module 3, the main control circuit 3 controls an isolation control circuit 4 to be disconnected, wherein in order to ensure the reliability of two symmetrical first-order RC filter circuits, strictly matching a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2, wherein the first capacitor C1 is more than or equal to ten times of the second capacitor C2; in the isolation control circuit 4, the first switch tube M1 and the second switch tube M2 can implement overvoltage short-circuit protection for the circuit according to the software system of the main control circuit 3.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. An intelligence thermocouple control circuit which characterized in that:
this intelligence thermocouple control circuit includes: the device comprises a signal acquisition circuit, a signal processing circuit, a main control circuit, an isolation control circuit and a communication circuit;
the signal acquisition circuit is used for acquiring electromotive force signals output by the thermocouple in multiple directions and filtering high-frequency noise of WIFI signals and mobile phone signals;
the signal processing circuit is used for converting the electromotive force signal acquired by the signal acquisition circuit into a digital signal and performing cold junction compensation on the thermocouple;
the main control circuit is used for receiving the digital signal output by the signal processing circuit, storing the digital signal output by the signal processing circuit, controlling the isolation control circuit to work and transmitting the digital signal to the communication circuit;
the isolation control circuit is used for isolating the output signal of the main control circuit and performing overvoltage short-circuit protection on the circuit;
and the communication circuit is used for carrying out multipoint distributed communication on the digital signals acquired by the main control circuit.
2. The intelligent thermocouple control circuit according to claim 1, further comprising: a field display and keyboard circuit;
the field display and keyboard circuit is used for displaying the digital signal output by the signal processing circuit on the field and controlling the work of the isolation control circuit;
and the first end of the field display and keyboard circuit is connected with the fourth end of the main control circuit.
3. The intelligent thermocouple control circuit according to claim 1, wherein the signal acquisition circuit comprises a thermocouple, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a third capacitor;
the first end of the thermocouple is connected with the first end of the first capacitor and the first end of the third capacitor through the first resistor, the second end of the thermocouple is connected with the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is connected with the second end of the first capacitor and the first end of the second capacitor, and the second end of the third resistor is grounded, and the second end of the second capacitor and the second end of the third capacitor are connected.
4. The intelligent thermocouple control circuit according to claim 3, wherein the signal processing circuit comprises a first converter, a fourth capacitor and a first voltage source; the main control circuit comprises a first control chip;
the first end of the first converter is grounded and the second end of the fourth capacitor, the second end of the first converter is connected with the second end of the first capacitor, the third end of the first converter is connected with the first end of the first capacitor, the fourth end of the first converter is connected with the first end of the fourth capacitor and the first voltage source, and the fifth end, the sixth end and the seventh end of the first converter are connected with the IO port of the first control chip.
5. The intelligent thermocouple control circuit according to claim 4, wherein the isolation control circuit comprises a fourth resistor, a fifth resistor, a first isolator, a second isolator, a sixth resistor, a seventh resistor and a switch control circuit;
the switch control circuit is used for controlling the conduction of a switch tube in the circuit; the circuit is used for reducing the loss of equipment and playing a role in circuit protection;
the first end of the fourth resistor is connected with the first end of the first isolator, the second end of the fourth resistor and the second end of the fifth resistor are connected with the IO port of the first control chip, the second end of the first isolator is grounded and the second end of the second isolator, the third end of the first isolator is connected with the first voltage source and the third end of the second isolator, the fourth end of the first isolator is connected with the first end of the sixth resistor, the first end of the second isolator is connected with the first end of the fifth resistor, the fourth end of the second isolator is connected with the first end of the seventh resistor, and the second end of the sixth resistor and the second end of the seventh resistor are connected with the switch control circuit.
6. The intelligent thermocouple control circuit according to claim 5, wherein the switch control circuit comprises an eighth resistor, a ninth resistor, a first switch tube and a second switch tube;
the first end of the eighth resistor is connected with the second end of the sixth resistor and the first end of the first switching tube, the second end of the eighth resistor is grounded, the second end of the ninth resistor, the second end of the first switching tube and the second end of the second switching tube, and the first end of the ninth resistor is connected with the second end of the seventh resistor and the first end of the second switching tube.
7. The intelligent thermocouple control circuit according to claim 1, wherein the communication circuit comprises a terminal node, a communication coordination module and a wireless communication serial port module;
the terminal node is used for receiving the digital signal output by the main control circuit;
the communication coordination module is used for connecting the terminal node with the wireless communication serial port module to transmit the digital signal;
the wireless communication serial port module is used for connecting wireless communication equipment;
the first end of the communication terminal node is connected with the communication end of the first control chip, the second end of the communication terminal node is connected with the first end of the communication coordination module, and the second end of the communication coordination module is connected with the wireless communication serial port module.
8. The intelligent thermocouple control circuit according to claim 7, wherein the terminal node comprises a first communication chip; the communication coordination module comprises a first converter, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a second voltage source; the wireless communication serial port module comprises a first serial interface;
the second end of the first converter is connected with a second voltage source, the tenth end of the first converter and a seventh capacitor through a sixth capacitor, the first end of the first converter is connected with the third end of the first converter through a fourth capacitor, the fourth end of the first converter is connected with the fifth end of the first converter through a fifth capacitor, the sixth end of the first converter is connected with the ground end and the other end of the seventh capacitor through an eighth capacitor, the seventh end and the eighth end of the first converter are connected with the IO port of the first communication chip, and the ninth end and the tenth end of the first converter are connected with the first serial interface.
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| CN111162509A (en) * | 2020-02-25 | 2020-05-15 | 上海派能能源科技股份有限公司 | Lithium battery short-circuit protection circuit and lithium battery management system |
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