CN204461641U - A kind of power station temperature measuring circuit - Google Patents
A kind of power station temperature measuring circuit Download PDFInfo
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- CN204461641U CN204461641U CN201520105802.9U CN201520105802U CN204461641U CN 204461641 U CN204461641 U CN 204461641U CN 201520105802 U CN201520105802 U CN 201520105802U CN 204461641 U CN204461641 U CN 204461641U
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- temperature
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- power station
- thermal resistance
- measuring circuit
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Abstract
The utility model discloses a kind of power station temperature measuring circuit, comprise thermal resistance, CD4052 chip, AD7792 acquisition chip, digital isolator and MK10DN512ZVLL10 microcontroller, the temperature signal input CD4052 chip that described thermal resistance is measured, described AD7792 acquisition chip gathers the temperature data that CD4052 chip exports, and the signal that described AD7792 acquisition chip exports is by inputting MK10DN512ZVLL10 microcontroller after digital isolator.The utility model utilizes the features such as thermal resistance (platinum resistance temperature sensor) measuring accuracy is high, repdocutbility good, stability is strong to complete the measurement of power station temperature; Adopt the three-wire system of thermal resistance to connect compensation way in circuit, using AD7792 as acquisition chip, the measurement of multichannel temperature can be realized by CD4052 chip.
Description
Technical field
The utility model relates to Thermistor Temperature Measurement technical field, particularly relates to power station temperature measurement system technical field.
Background technology
In industrial processes, in order to the generation effectively carrying out production operation, find potential safety hazard, avoid security incident etc., need relevant parameters as temperature, flow etc. detect automatically, and temperature is the physical quantity of the cold and hot degree of tolerance object, at present in the temp measuring system of power station, many designs are had to be adopt band temperature transmitter structure, deliver to secondary instrument again after temperature signal being converted to the DC current of 4 ~ 20mA or other data acquisition system (DAS) carries out Temperature displaying, so each temperature element needs a temperature transmitter.The shortcoming of this system is that cost is high, and each transmitter is worth several thousand yuan, and the existence due to temperature transmitter makes temp measuring system not only add an error link but also many one deck trouble spots.
Utility model content
For stable difference existing in the temp measuring system of current power station, reliability is low, the linearity is inadequate and the problem such as hot wire, and the utility model provides a kind of power station temperature measuring circuit.
In order to solve the problems of the technologies described above, the utility model have employed following technical scheme:
A kind of power station temperature measuring circuit, comprise thermal resistance, CD4052 chip, AD7792 acquisition chip, digital isolator and MK10DN512ZVLL10 microcontroller, the temperature signal input CD4052 chip that described thermal resistance is measured, described AD7792 acquisition chip gathers the temperature data that CD4052 chip exports, and the signal that described AD7792 acquisition chip exports is by inputting MK10DN512ZVLL10 microcontroller after digital isolator.
As a kind of preferred version of the present utility model, described thermal resistance adopts platinum resistance temperature sensor.
As another kind of preferred version of the present utility model, the line system of described thermal resistance adopts the three-wire system mode being applicable to power station temp measuring system.
As a kind of improvement project of the present utility model, described digital isolator adopts ADUM1401ARW digital isolator.
Power station of the present utility model temperature measuring circuit tool has the following advantages:
1, this power station temperature measuring circuit have employed platinum resistance thermometer sensor, and its principal feature is that measuring accuracy is high, stable performance, as long as the change in resistance measuring platinum resistance just can measure temperature; Hot wire system have selected three-wire system connected mode, and this connected mode can eliminate the impact of lead resistance preferably, is connected mode the most frequently used in industrial stokehold, is also best suited for the connected mode of power station temp measuring system; And the use of AD7792 acquisition chip, high-precision temperature data can be measured, simplify the design of temp measuring system; The use of CD4052 chip can save the IO pin number of master chip to complete the measurement of multichannel temperature.
2, this power station temperature measuring circuit thoroughly abandons temperature transmitter in hydroelectric power plant's temp measuring system, and use thermal resistance to measure and by various signal input circuit, under the prerequisite meeting hydroelectric power plant's temp measuring system measuring accuracy requirement, both improve reliability like this and again reduced cost.
Accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of power station temperature measuring circuit;
Fig. 2 is the circuit diagram of thermal resistance three-wire system electric connecting mode.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of power station temperature measuring circuit comprises thermal resistance, CD4052 chip, AD7792 acquisition chip, digital isolator ADUM1401ARW and MK10DN512ZVLL10 microcontroller.The temperature signal input CD4052 chip that thermal resistance is measured, AD7792 acquisition chip gathers the temperature data that CD4052 chip exports, and the signal that AD7792 acquisition chip exports is by inputting MK10DN512ZVLL10 microcontroller after digital isolator.
Thermal resistance adopts platinum resistance temperature sensor, utilizes the features such as thermal resistance (platinum resistance temperature sensor) measuring accuracy is high, repdocutbility good, stability is strong to complete the measurement of power station temperature.The line system of thermal resistance adopts the three-wire system mode being applicable to power station temp measuring system, thermal resistance three-wire system electric connecting mode as shown in Figure 2, three-wire system connection is modal connection in practical application, the measuring error that this connection causes in order to the resistance compensating lead wire.Three-wire system requires that the material of three wires, wire diameter, length are consistent and the identical resistance value of three wires that makes of working temperature is identical, namely RL1=RL2=RL3, Rt are thermal resistance, and RL1 is the equivalent resistance of wire L1, RL2 is the equivalent resistance of wire L2, and RL3 is the equivalent resistance of wire L3.CD4052 chip realizes the measurement of multichannel temperature, and digital isolator adopts ADUM1401ARW.
This power station temperature measuring circuit design AD7792 acquisition chip realizes the collection to temperature data.Adopt the three-wire system connected mode of platinum resistance to complete the measurement of power station temperature, whole temperature measuring circuit, based on CD4052 chip, is made up of AD7792 acquisition chip, digital isolator ADUM1401ARW, MK10DN512ZVLL10 microcontroller.AD7792 acquisition chip is the low-power consumption of a applicable high-acruracy survey application, low noise, full simulation front end, built-in PGA, reference voltage source, clock and exciting current, corresponding enlargement factor can be selected to different input signals, realize the coupling of signal, thus enormously simplify thermocouple system design.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (4)
1. a power station temperature measuring circuit, it is characterized in that: comprise thermal resistance, CD4052 chip, AD7792 acquisition chip, digital isolator and MK10DN512ZVLL10 microcontroller, the temperature signal input CD4052 chip that described thermal resistance is measured, described AD7792 acquisition chip gathers the temperature data that CD4052 chip exports, and the signal that described AD7792 acquisition chip exports is by inputting MK10DN512ZVLL10 microcontroller after digital isolator.
2. a kind of power station according to claim 1 temperature measuring circuit, is characterized in that: described thermal resistance adopts platinum resistance temperature sensor.
3. a kind of power station according to claim 1 temperature measuring circuit, is characterized in that: the line system of described thermal resistance adopts the three-wire system mode being applicable to power station temp measuring system.
4. a kind of power station according to claim 1 temperature measuring circuit, is characterized in that: described digital isolator adopts ADUM1401ARW digital isolator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520105802.9U CN204461641U (en) | 2015-02-13 | 2015-02-13 | A kind of power station temperature measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520105802.9U CN204461641U (en) | 2015-02-13 | 2015-02-13 | A kind of power station temperature measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204461641U true CN204461641U (en) | 2015-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520105802.9U Active CN204461641U (en) | 2015-02-13 | 2015-02-13 | A kind of power station temperature measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204461641U (en) |
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2015
- 2015-02-13 CN CN201520105802.9U patent/CN204461641U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |