CN114488870A - High-reliability multi-type electric power front end temperature acquisition device and system - Google Patents
High-reliability multi-type electric power front end temperature acquisition device and system Download PDFInfo
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Abstract
The invention relates to a high-reliability multi-type electric power front end temperature acquisition device and a system, wherein the device comprises: the power supply supplies power to the system side circuit and the field side circuit after voltage transformation and isolation, and the system side circuit and the field side circuit are in communication connection; the field side circuit is used for controlling the conduction of a signal acquisition channel corresponding to each detection signal according to the signal detection information, preprocessing the detection signals and sending the preprocessed detection signals and precise resistance signals provided in the field side circuit to the system side circuit; and the system side circuit is used for comparing and processing the processed detection signal and the precision resistance signal to obtain a field temperature value to be measured. The invention can realize the configurable multi-type signals of millivolt signals, resistance signals, thermocouples and thermal resistors and has good anti-interference characteristic.
Description
Technical Field
The invention relates to the technical field of automation and instruments and meters, in particular to a high-reliability multi-type electric power front end temperature acquisition device and system.
Background
In the field of industrial control, an electric power front-end signal acquisition device is used as an important module of an input signal of a field control station, and the type of the signal which can be acquired and the reliability of the device are very important. In the domestic medium and large-scale thermal power plants, centralized control systems are generally adopted, but field signals are relatively dispersed, and in practical application, too many temperature analog signal acquisition points often appear, so that the cost is huge.
The signal acquisition device is commonly used for acquiring signals of temperature sensors in production fields and public works, and the type of the signals which can be acquired by the current analog signal input type device is single, so that the complex temperature measurement requirement cannot be met. And the temperature measurement field environment interference is usually large, and the device has good anti-interference performance. The system needs to use a simpler channel signal type configuration mode to meet the maintenance and detection requirements.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a highly reliable multi-type power front-end temperature acquisition device and system, which solves the technical problems that the signal type acquired by the existing signal acquisition device is single, cannot meet the complex temperature measurement requirement, and does not have a good anti-interference function.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in one aspect, an embodiment of the present invention provides a highly reliable multi-type electric power front end temperature acquisition apparatus, including: the power supply supplies power to the system side circuit and the field side circuit after voltage transformation and isolation, and the system side circuit and the field side circuit are in communication connection;
the field side circuit is used for controlling the conduction of a signal acquisition channel corresponding to each detection signal according to the signal detection information, preprocessing the detection signals and sending the preprocessed detection signals and precise resistance signals provided in the field side circuit to the system side circuit;
and the system side circuit is used for comparing and processing the processed detection signal and the precision resistance signal to obtain a temperature value to be measured on site.
Optionally, the field side circuitry comprises: the system comprises a multi-channel signal acquisition and conditioning circuit, a precision resistance control circuit and a magnetic isolation circuit, wherein the precision resistance control circuit and the magnetic isolation circuit are connected with the multi-channel signal acquisition and conditioning circuit and are also connected with a system side circuit;
the precision control circuit is used for providing precision resistance information;
the magnetic isolation circuit is used for carrying out magnetic isolation on signals input into the system side circuit;
the multi-channel signal acquisition and conditioning circuit is used for controlling the signal acquisition channels corresponding to the detection signals to be conducted when a plurality of types of signal input are detected, filtering and A/D conversion are carried out on the detection signals, and then the processed detection signals and the precision resistance signals obtained from the precision resistance control circuit are sent to the system side circuit through the magnetic isolation circuit.
Optionally, the multi-channel signal acquisition and conditioning circuit includes: the device comprises a port strong current misconnection prevention circuit, a signal acquisition channel, a channel control switch and an AD sampling circuit;
the port strong current misconnection prevention circuit is arranged at the signal input end of each signal acquisition channel and used for performing overvoltage and overcurrent protection on each signal acquisition channel;
the channel control switch is used for controlling the signal acquisition channels to be switched on or switched off;
the AD sampling circuit is used for carrying out analog-to-digital conversion and digital filtering on the temperature detection signals received by the signal acquisition channels.
Optionally, the port strong current misconnection prevention circuit includes: a bypass capacitor, a fuse and a TVS tube; one end of the bypass capacitor and one end of the fuse are connected with a signal input end of the signal acquisition channel, the other end of the fuse is connected with one end of the TVS tube, and the other end of the bypass capacitor and the other end of the TVS tube are grounded.
Optionally, the field circuit is further provided with a compensation circuit connected to the multi-channel signal acquisition and conditioning circuit and the system side circuit respectively;
the compensation circuit is a TC voltage bias circuit for cold end temperature compensation;
and when the temperature detection signal is detected by the thermocouple, starting a TC voltage bias circuit through a dial switch to perform cold end temperature compensation.
Optionally, the field-side circuit further comprises: the RS485 communication module is respectively connected with the power supply and the system side circuit;
RS485 communication module includes: the system comprises a communication interface connected with preset external equipment, a signal isolation circuit connected with the system side circuit and a power isolation module connected with the power supply;
the communication interface is used for receiving control information of preset external equipment and sending the control information to the system side circuit through the power isolation module.
Optionally, the system side circuitry comprises: the device comprises a main controller, an IPS communication interface, an RS485 communication interface, a latch circuit and a watchdog circuit, wherein the IPS communication interface, the RS485 communication interface, the latch circuit and the watchdog circuit are connected with the main controller;
the IPS communication interface is used for information transmission between the main controller and the compensation circuit, the precision resistance control circuit and the magnetic isolation circuit;
the RS485 communication interface is used for information transmission between the main controller and the signal isolation circuit;
the latch circuit is used for acquiring the state of a dial switch and/or controlling the indicator lamp to be lightened according to the control information output by the controller;
the main controller is used for outputting control information to the latch circuit and is also used for acquiring output signals of the compensation circuit by controlling the AD sampling circuit through the IPS communication interface after acquiring the state of the dial switch.
Optionally, the system side circuit further comprises: an extension and interaction circuit connected to the host controller, the extension and interaction circuit comprising: JTAG interface module and LCD interface module.
Alternatively,
the electric power front end temperature acquisition device is provided with 24 signal acquisition channels;
the detection signal includes: a voltage signal of 0-20 mV, a voltage signal of 0-100 mV, a thermocouple signal, a PT100, Cu50, PT1000 thermal resistance signal of two/three wire system and a resistance signal; the thermocouple signal includes: E. j, K, N, T, B, S, R eight kinds.
On the other hand, an embodiment of the present invention further provides a high-reliability multi-type power front end temperature acquisition system, including: the power front end temperature acquisition device and the upper computer and/or the exchange interface which are in communication connection with the power front end temperature acquisition device are/is arranged on the power front end temperature acquisition device;
the upper computer and/or the exchange interface are/is used for outputting configuration information of sampling signal types aiming at each signal acquisition channel to the electric power front end temperature acquisition device, so that the electric power front end temperature acquisition device determines the measurement signal types supported by each signal acquisition channel according to the configuration information.
(III) advantageous effects
The invention has the beneficial effects that: aiming at the existing increasingly complex application scenes and temperature measurement requirements, the electric power front end temperature acquisition device disclosed by the invention supports the simultaneous measurement of multi-channel and multi-type signals, and adopts a comprehensive protection measure combining various isolation circuits and anti-interference measures to ensure the stable sampling and high-reliability operation of the temperature acquisition device. Therefore, the temperature acquisition device has strong anti-interference characteristic for easily-triggered events such as power grid interference, EMC (electro magnetic compatibility), strong current misconnection and the like, and the channel signal type configuration flow of the temperature acquisition device is not complex, so that the temperature acquisition device has the advantages of large time and cost in daily maintenance and overhaul.
Drawings
Fig. 1 is a schematic structural diagram of a highly reliable multi-type electric power front end temperature acquisition device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a high-voltage mis-connection protection circuit of a highly reliable multi-type power front-end temperature acquisition device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal structure of a PHOTOMOS tube of a highly reliable multi-type electric power front end temperature acquisition device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical coupler isolator of a high-reliability multi-type power front-end temperature acquisition device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an internal structure of a magnetic isolation chip of a highly reliable multi-type electric power front end temperature acquisition device according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a compensation circuit of a highly reliable multi-type power front-end temperature acquisition device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a circuit structure of a multi-channel signal collecting and conditioning circuit and a precise resistance control circuit of a high-reliability multi-type power front-end temperature collecting device according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a latch circuit of a highly reliable multi-type power front end temperature acquisition device according to an embodiment of the present invention;
fig. 9 is a schematic circuit structure diagram of an extension and interaction circuit of a highly reliable multi-type power front-end temperature acquisition device according to an embodiment of the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, a highly reliable multi-type power front end temperature acquisition apparatus provided in an embodiment of the present invention includes: the power supply supplies power to the system side circuit and the field side circuit after transformation and isolation, and the system side circuit and the field side circuit are in communication connection; the field side circuit is used for controlling the conduction of a signal acquisition channel corresponding to each detection signal according to the signal detection information, preprocessing the detection signals and then sending the preprocessed detection signals and precise resistance signals provided by the interior of the field side circuit to the system side circuit; and the system side circuit is used for comparing and processing the processed detection signal and the precision resistance signal to obtain a field temperature value to be measured.
Aiming at the existing increasingly complex application scenes and temperature measurement requirements, the electric power front end temperature acquisition device disclosed by the invention supports the simultaneous measurement of multi-channel and multi-type signals, and adopts a comprehensive protection measure combining various isolation circuits and anti-interference measures to ensure the stable sampling and high-reliability operation of the temperature acquisition device. Therefore, the temperature acquisition device has strong anti-interference characteristic for easily-triggered events such as power grid interference, EMC (electro magnetic compatibility), strong current misconnection and the like, and the channel signal type configuration flow of the temperature acquisition device is not complex, so that the temperature acquisition device has the advantages of large time and cost in daily maintenance and overhaul.
For a better understanding of the above-described technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the field-side circuit includes: the system comprises a multi-channel signal acquisition and conditioning circuit, a precision resistance control circuit and a magnetic isolation circuit, wherein the precision resistance control circuit and the magnetic isolation circuit are connected with the multi-channel signal acquisition and conditioning circuit and are also connected with a system side circuit; the precise control circuit is used for providing precise resistance information; the magnetic isolation circuit is used for carrying out magnetic isolation on signals input into the system side circuit; the multi-channel signal acquisition and conditioning circuit is used for controlling the signal acquisition channels corresponding to the detection signals to be conducted when a plurality of types of signal input are detected, filtering and A/D conversion are carried out on the detection signals, and then the processed detection signals and the precision resistance signals obtained from the precision resistance control circuit are sent to a system side circuit through the magnetic isolation circuit.
Further, the multichannel signal acquisition and conditioning circuit includes: the device comprises a port strong current misconnection prevention circuit, a signal acquisition channel, a channel control switch and an AD sampling circuit; the port strong current misconnection prevention circuit is arranged at the signal input end of each signal acquisition channel and used for performing overvoltage and overcurrent protection on each signal acquisition channel; the channel control switch is used for controlling the connection or the disconnection of each signal acquisition channel; the AD sampling circuit is used for carrying out analog-to-digital conversion and digital filtering on the temperature detection signals received by the signal acquisition channels. Specifically, as shown in fig. 7, the signal acquisition channel includes a switch U1 … … U2N (model number TLP181 GB). The switch control signals SEL1 … … SELN, when one of the control signals is low, the channel is gated. The precision resistor control circuit comprises U3, U4 (model number is TLP181GB) and a precision resistor, and when SELP is low level, the precision resistor control circuit measures the resistance value of the precision resistor.
Further, as shown in fig. 2, the port strong current misconnection preventing circuit includes: a bypass capacitor, a fuse and a TVS tube; one end of the bypass capacitor and one end of the fuse are both connected with the signal input end of the signal acquisition channel; the one end of TVS pipe is connected to the other end of fuse, and bypass capacitor's the other end all grounds with the other end of TVS pipe. After the field signal is connected into the electric power front end temperature acquisition device, a capacitor is connected between the input ends in a bridging manner, and then the field signal is connected into a bypass capacitor in parallel, so that the function of filtering noise waves is achieved; a self-recovery fuse is connected in series, when the input signal current is greater than the fuse fusing current, the fuse is opened, and large current is prevented from entering the device; then connect a TVS tube in parallel, when the transient voltage exceeds the breakdown voltage of TVS tube, the TVS tube will take place the avalanche breakdown, provide an ultra-low impedance route for the transient current, the transient current is short-circuited to GND through the TVS tube to avoid the large voltage signal to get into the device inside, and the voltage of input signal keeps the cut-off voltage always before the voltage recovers to the normal range. Each signal input path is provided with the protection circuit, and overvoltage and overcurrent protection can be carried out no matter which input mode (two-wire system active or passive, three-wire system, four-wire system and the like) is adopted.
Furthermore, the channel control switch is a PHOTOMOS transistor, i.e., a MOSFET output photoelectric coupler, and the schematic structural diagram is shown in fig. 3. The operating principle is that the photoelectric element converts the voltage of the light-emitting element, and the conduction and the disconnection of the load circuit are controlled by the conduction and the non-conduction of the power MOSFET. The PHOTOMOS tube is not mechanically closed, the reliability is high, and the photoelectric isolation of the output signal circuit of the controller and other circuits is realized. The PHOTOMOS tube in the device is used for switching the on state and the off state of a channel by an analog switch circuit, is applied to a TC voltage bias circuit to realize cold end temperature compensation, and is applied to a precise resistance control circuit. Preferably, the channel control switch, the TC voltage bias circuit and the precision resistance sampling control circuit are isolated by employing a PHOTOMOS tube.
Then, the system side circuit includes: the device comprises a main controller, an IPS communication interface, an RS485 communication interface, a latch circuit and a watchdog circuit, wherein the IPS communication interface, the RS485 communication interface, the latch circuit and the watchdog circuit are connected with the main controller. The IPS communication interface is used for information transmission between the main controller and the compensation circuit, between the main controller and the precision resistance control circuit and between the main controller and the magnetic isolation circuit; and the RS485 communication interface is used for information transmission between the main controller and the signal isolation circuit. The latch circuit is used for acquiring the state of the dial switch and/or controlling the indicator lamp to be lightened according to the control information output by the controller. The main controller is used for outputting control information to the latch circuit and also used for controlling the AD sampling circuit to collect output signals of the compensation circuit through the IPS communication interface after acquiring the state of the dial switch. As shown in FIG. 8, the latch circuit includes a bus transceiver U5 (model 74HC245) with an input pin P0 … … P5 connected to the dip switch and an output pin IO1 … … IO6 connected to the CPU, gated via pin/ADDR _ EN. The input pins of a trigger U6 (model 74HC574) are all IO1 … … IO6 and are connected with a CPU, the output pins are LED1 … …, LED6 and are connected with an LED lamp, and the LED lamp is gated through a pin/LED _ CLK.
Next, the field side circuit is also provided with an RS485 communication module which is respectively connected with the power supply and the system side circuit; RS485 communication module includes: the system comprises a communication interface connected with preset external equipment, a signal isolation circuit connected with a system side circuit and a power isolation module connected with a power supply; the communication interface receives preset control information of the external equipment and sends the control information to the system side circuit through the power isolation module.
The RS-485 communication module adopts a high-speed optical coupler for isolation, so that photoelectric isolation of communication signals is realized, and the schematic structural diagram is shown in FIG. 4. The input electric signal drives the light emitting diode to emit light, the photodiode at the output end is conducted by light, and the output end outputs a signal. In the photoelectric coupler, the influence of common-mode input voltage on output current is small, so that the common-mode rejection ratio is high, and the anti-interference performance of a communication module of the device is improved.
Before the signals of the field side enter the system side, isolation is needed, and as shown in fig. 5, the isolation circuit adopts an icompler magnetic isolation technology and a magnetic isolation chip. The magnetic isolation and the optical coupler isolation are different in that the magnetic isolation greatly eliminates a series of problems of uncertain current transmission rate, nonlinear transmission characteristics, drift along with time, temperature drift and the like in the optical coupler, the accuracy of signals input into the main controller after isolation is guaranteed, and the reliability of the device is improved.
Then, the field circuit is also provided with a compensation circuit which is respectively connected with the multi-channel signal acquisition and conditioning circuit and the system side circuit, and the compensation circuit is a TC voltage bias circuit for cold end temperature compensation; when a temperature detection signal is detected by a thermocouple, a TC voltage bias circuit is started through a dial switch to perform cold end temperature compensation. Specifically, as shown in fig. 6, the compensation circuit includes: the three-terminal regulator, first electric capacity, the second electric capacity, the third electric capacity, first resistance, third resistance and temperature compensation resistance, the one end of first electric capacity and three-terminal regulator's input all are as signal input part, the one end of second electric capacity and the one end of first resistance are connected simultaneously to the output of three-terminal regulator, the one end of the third resistance of the one end of temperature compensation resistance is connected simultaneously to the other end of first resistance, the one end and the temperature compensation signal output part of third electric capacity are connected to the other end of third resistance, and the other end of first electric capacity, three-terminal regulator's earthing terminal, the other end of second electric capacity, the other end of temperature compensation resistance and the other end of third electric capacity all ground connection. Wherein the model of the three-terminal regulator is REF 3125.
However, the system side circuit further includes: an extension and interaction circuit connected to the host controller, as shown in fig. 9, includes: JTAG interface module and LCD interface module. The JTAG interface module supports JTAG protocol, and the LCD interface module is connected with the LCD.
In addition, an embodiment of the present invention further provides a high-reliability multi-type power front-end temperature acquisition system, including: the power front end temperature acquisition device and the upper computer and/or the exchange interface which are in communication connection with the power front end temperature acquisition device are/is arranged on the power front end temperature acquisition device.
And the upper computer and/or the exchange interface outputs configuration information of the sampling signal type of each signal acquisition channel to the electric power front end temperature acquisition device, so that the electric power front end temperature acquisition device determines the measurement signal type supported by each signal acquisition channel according to the configuration information. After the upper computer configuration software or the exchange interface is configured with the channel sampling signal type, the configuration information is downloaded to a main controller of the device through an RS485 communication module, and the main controller determines the measured signal type according to the configuration information. The signal acquisition channel supports acquisition of voltage signals, thermocouple signals, thermal resistance signals and resistance signals. Through the configuration of the upper machine, each channel can receive different types of signals by using different wiring modes, and the channels are isolated from one another and do not influence one another. The field thermal resistance signal supports a three-wire system connection method and a two-wire system connection method, and lead errors can be eliminated through three-wire system measurement.
In summary, the present invention provides a highly reliable multi-type electric power front end temperature acquisition apparatus and system, in order to ensure the high reliability and stability of the apparatus, the whole system includes a plurality of isolation circuits and anti-interference measures. The isolation measures of the system side and the field side mainly comprise a port strong current misconnection prevention circuit, PHOTOMOS tube isolation (an analog switch circuit for realizing channel switching, a TC voltage bias circuit for realizing cold junction temperature compensation and a precise resistance control circuit), RS485 communication module optical coupling isolation and magnetic isolation when a field side signal enters the system side. The anti-interference measures are as follows: the signal sampling port adopts a common mode capacitor, a differential mode capacitor and an RC filter to eliminate high-frequency signal interference and power frequency interference of a power grid, wherein the design of the capacitor and the RC can design a reasonable value to reach the EMC index of an industrial instrument according to the implementation of the device; after the input signal is subjected to analog-to-digital conversion, power frequency interference is eliminated by using a digital filter, and the integral multiple period filtering with 20ms as the minimum unit can effectively reduce the interference of 50Hz power frequency; anti-interference elements (magnetic beads) are used at key places such as signal ports and circuit board connecting lines, high-frequency noise and peak interference are suppressed, and electrostatic pulses are absorbed; and during wiring, the area of a loop is reduced so as to reduce noise generated by electromagnetic induction, and a power supply, grounding and the like of the printed board are reasonably arranged.
Based on the above description, the specific implementation process of the present invention is: the power supply supplies power to the system side circuit and the field side circuit after voltage transformation and isolation processing. And the channel sampling signal type is configured by the upper computer configuration software point. The point configuration refers to the configuration of the sampling signal type of each channel realized through configuration software or an exchange interface of an upper computer. The port input signal passes through the strong current misconnection prevention circuit and then passes through the RC low-pass filter circuit, the channel control switch enables the signal acquisition channel to be in a conducting state, the signal enters the AD sampling module to be subjected to analog-to-digital conversion and digital filtering, and the converted digital signal is isolated by the magnetic isolation chip and then enters the main controller. And comparing and processing the input signal and the precise resistance signal in the main controller, eliminating the influence caused by resistance error, and calculating to obtain the temperature value to be measured on site. The cold end temperature compensation correction system is arranged in the module, and when the thermocouple is used for measuring the temperature of the channel, the cold end compensation function can be turned on or turned off through the dial switch according to actual requirements.
Since the system/apparatus described in the above embodiments of the present invention is a system/apparatus used for implementing the method of the above embodiments of the present invention, a person skilled in the art can understand the specific structure and modification of the system/apparatus based on the method described in the above embodiments of the present invention, and thus the detailed description is omitted here. All systems/devices adopted by the methods of the above embodiments of the present invention are within the intended scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.
Claims (10)
1. The utility model provides a high reliable polymorphic type electric power front end temperature acquisition device which characterized in that includes: the power supply supplies power to the system side circuit and the field side circuit after voltage transformation and isolation, and the system side circuit and the field side circuit are in communication connection;
the field side circuit is used for controlling the conduction of a signal acquisition channel corresponding to each detection signal according to the signal detection information, preprocessing the detection signals and sending the preprocessed detection signals and precise resistance signals provided in the field side circuit to the system side circuit;
and the system side circuit is used for comparing and processing the processed detection signal and the precision resistance signal to obtain a temperature value to be measured on site.
2. The highly reliable multiple-type power front-end temperature acquisition device according to claim 1, wherein the field-side circuit comprises: the system comprises a multi-channel signal acquisition and conditioning circuit, a precision resistance control circuit and a magnetic isolation circuit, wherein the precision resistance control circuit and the magnetic isolation circuit are connected with the multi-channel signal acquisition and conditioning circuit and are also connected with a system side circuit;
the precision control circuit is used for providing precision resistance information;
the magnetic isolation circuit is used for carrying out magnetic isolation on signals input into the system side circuit;
the multi-channel signal acquisition and conditioning circuit is used for controlling the signal acquisition channels corresponding to the detection signals to be conducted when a plurality of types of signal input are detected, filtering and A/D conversion are carried out on the detection signals, and then the processed detection signals and the precision resistance signals obtained from the precision resistance control circuit are sent to the system side circuit through the magnetic isolation circuit.
3. The highly reliable multiple-type power front-end temperature acquisition device according to claim 2, wherein the multi-path signal acquisition and conditioning circuit comprises: the device comprises a port strong current misconnection prevention circuit, a signal acquisition channel, a channel control switch and an AD sampling circuit;
the port strong current misconnection prevention circuit is arranged at the signal input end of each signal acquisition channel and used for performing overvoltage and overcurrent protection on each signal acquisition channel;
the channel control switch is used for controlling the signal acquisition channels to be switched on or switched off;
the AD sampling circuit is used for carrying out analog-to-digital conversion and digital filtering on the temperature detection signals received by the signal acquisition channels.
4. The highly reliable multiple-type power front-end temperature acquisition device according to claim 3, wherein the port strong current misconnection prevention circuit comprises: a bypass capacitor, a fuse and a TVS tube; one end of the bypass capacitor and one end of the fuse are both connected with the signal input end of the signal acquisition channel, the other end of the fuse is connected with one end of the TVS tube, and the other end of the bypass capacitor and the other end of the TVS tube are both grounded.
5. The highly reliable multi-type electric power front end temperature acquisition device according to claim 2, wherein the field circuit is further provided with a compensation circuit connected to the multi-path signal acquisition and conditioning circuit and the system side circuit, respectively;
the compensation circuit is a TC voltage bias circuit for performing cold end temperature compensation;
and when the temperature detection signal is detected by the thermocouple, starting a TC voltage bias circuit through a dial switch to perform cold end temperature compensation.
6. The highly reliable multiple-type power front-end temperature acquisition device according to claim 1, wherein the field-side circuit further comprises: the RS485 communication module is respectively connected with the power supply and the system side circuit;
RS485 communication module includes: the system comprises a communication interface connected with preset external equipment, a signal isolation circuit connected with the system side circuit and a power isolation module connected with the power supply;
the communication interface is used for receiving control information of preset external equipment and sending the control information to the system side circuit through the power isolation module.
7. The highly reliable multi-type power front end temperature acquisition device according to claim 2, wherein the system side circuit comprises: the device comprises a main controller, an IPS communication interface, an RS485 communication interface, a latch circuit and a watchdog circuit, wherein the IPS communication interface, the RS485 communication interface, the latch circuit and the watchdog circuit are connected with the main controller;
the IPS communication interface is used for information transmission between the main controller and the compensation circuit, the precision resistance control circuit and the magnetic isolation circuit;
the RS485 communication interface is used for information transmission between the main controller and the signal isolation circuit;
the latch circuit is used for acquiring the state of a dial switch and/or controlling the indicator lamp to be lightened according to the control information output by the controller;
the main controller is used for outputting control information to the latch circuit and is also used for acquiring output signals of the compensation circuit by controlling the AD sampling circuit through the IPS communication interface after acquiring the state of the dial switch.
8. The highly reliable multiple-type power front-end temperature acquisition device according to claim 7, wherein the system-side circuit further comprises: an extension and interaction circuit connected to the host controller, the extension and interaction circuit comprising: JTAG interface module and LCD interface module.
9. The highly reliable multi-type power front end temperature acquisition device according to any one of claims 1 to 8,
the electric power front end temperature acquisition device is provided with 24 signal acquisition channels;
the detection signal includes: a voltage signal of 0-20 mV, a voltage signal of 0-100 mV, a thermocouple signal, a PT100, Cu50, PT1000 thermal resistance signal of two/three wire system and a resistance signal; the thermocouple signal includes: E. j, K, N, T, B, S, R eight kinds.
10. The utility model provides a high reliable polymorphic type electric power front end temperature acquisition system which characterized in that includes: the power front end temperature acquisition device according to any one of claims 1 to 9, and an upper computer and/or a switching interface in communication connection with the power front end temperature acquisition device;
the upper computer and/or the exchange interface are/is used for outputting configuration information of sampling signal types aiming at each signal acquisition channel to the electric power front end temperature acquisition device, so that the electric power front end temperature acquisition device determines the measurement signal types supported by each signal acquisition channel according to the configuration information.
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| CN202111583698.0A CN114488870A (en) | 2021-12-22 | 2021-12-22 | High-reliability multi-type electric power front end temperature acquisition device and system |
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| CN202111583698.0A CN114488870A (en) | 2021-12-22 | 2021-12-22 | High-reliability multi-type electric power front end temperature acquisition device and system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4031355A (en) * | 1975-03-31 | 1977-06-21 | Leonik Jr Stephen A | Multi-channel temperature responsive process control system |
| CN109974880A (en) * | 2019-04-11 | 2019-07-05 | 重庆川仪控制系统有限公司 | A kind of multichannel thermocouple acquisition module |
| CN214149617U (en) * | 2020-11-16 | 2021-09-07 | 上海明勃电气自动化有限公司 | Multi-channel economical high-precision temperature measuring module for thermocouple signals |
-
2021
- 2021-12-22 CN CN202111583698.0A patent/CN114488870A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4031355A (en) * | 1975-03-31 | 1977-06-21 | Leonik Jr Stephen A | Multi-channel temperature responsive process control system |
| CN109974880A (en) * | 2019-04-11 | 2019-07-05 | 重庆川仪控制系统有限公司 | A kind of multichannel thermocouple acquisition module |
| CN214149617U (en) * | 2020-11-16 | 2021-09-07 | 上海明勃电气自动化有限公司 | Multi-channel economical high-precision temperature measuring module for thermocouple signals |
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