CN212569562U - Temperature controller - Google Patents
Temperature controller Download PDFInfo
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- CN212569562U CN212569562U CN202021849388.XU CN202021849388U CN212569562U CN 212569562 U CN212569562 U CN 212569562U CN 202021849388 U CN202021849388 U CN 202021849388U CN 212569562 U CN212569562 U CN 212569562U
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Abstract
The utility model discloses a temperature controller, which comprises a central processing unit, a temperature acquisition circuit, an output voltage acquisition circuit and a communication circuit, wherein the temperature acquisition circuit, the output voltage acquisition circuit and the communication circuit are all connected with the central processing unit; the temperature controller also comprises a cold end compensation circuit connected with the temperature acquisition circuit and a heating rod connected with the output voltage acquisition circuit; the communication circuit is connected with an external PC end; the temperature controller also comprises a temperature sensor connected with the cold end compensation circuit. The utility model discloses but compatible different model thermocouple sensor, but real-time temperature acquisition, and realized high sampling rate.
Description
Technical Field
The utility model relates to an electronic design field especially relates to a temperature controller.
Background
With the continuous development of science and technology, the semiconductor industry, the new material industry and the new energy industry are adopted. The requirements on materials are higher and higher, the requirements on the temperature of a test environment are higher and higher under the condition that certain materials show different physical and electrical properties at different temperatures, the requirements on the stability, accuracy and controllable range of temperature control are higher, and the requirements on the operability of a controller are also higher.
Most of similar products in the current market have the defects of small thermocouple voltage signal and potential difference at normal temperature.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a temperature controller.
The utility model provides a technical scheme that its technical problem adopted is:
providing a temperature controller, which comprises a central processing unit, and a temperature acquisition circuit, an output voltage acquisition circuit and a communication circuit which are connected with the central processing unit; the temperature controller also comprises a cold end compensation circuit connected with the temperature acquisition circuit and a heating rod connected with the output voltage acquisition circuit; the communication circuit is connected with an external PC end;
the temperature controller also comprises a temperature sensor connected with the cold end compensation circuit.
According to the technical scheme, the temperature acquisition circuit acquires signals generated by the temperature sensor compensated by the cold end compensation circuit, and the output voltage acquisition circuit acquires voltages at two ends of the heating rod.
According to the technical scheme, the output voltage acquisition circuit comprises a digital-to-analog conversion circuit, an MOS tube driving signal amplification circuit, a current control circuit and a sampling circuit which are sequentially connected, the digital-to-analog conversion circuit is connected with the central processing unit, signals output by the central processing unit form analog signals after digital-to-analog conversion, the analog signals form negative feedback after the MOS tube driving signal amplification circuit performs two-stage amplification and serve as MOS tube driving signals, and the sampling circuit comprises an MOS tube source current sampling circuit and voltage sampling circuits at two ends of the heating rod.
According to the technical scheme, the temperature acquisition circuit comprises an input signal amplification circuit, a differential signal conversion circuit and an acquisition circuit, the input signal amplification circuit amplifies acquired temperature sensing signals through a gear adjusting chip, the differential signal conversion circuit converts amplified signals output by the input signal amplification circuit into differential signals, and the acquisition circuit acquires the differential signals and then sends the differential signals to the central processing unit.
In connection with the above technical solution, the cold junction compensation circuit includes an input signal linear amplification circuit, a voltage follower circuit and a signal amplification circuit, the input signal linear amplification circuit linearly amplifies a voltage signal of the temperature sensor, the voltage follower circuit compensates the voltage signal after the linear amplification to form a voltage follower signal, and adds the voltage follower signal as a reference signal to the voltage signal of the temperature sensor, and the signal amplification circuit adds the input signal and the reference signal and then amplifies the voltage follower signal.
According to the technical scheme, the temperature sensor is a thermocouple.
The utility model discloses the beneficial effect who produces is: the utility model discloses a cold junction compensating circuit can eliminate the potential difference, makes voltage signal enlarge easily to gather through signal acquisition amplifier circuit, has solved the defect that there is the potential difference under thermocouple voltage signal undersize, the normal atmospheric temperature.
Further, the utility model discloses a leading gear switching circuit of temperature acquisition circuit carries out a plurality of gears to whole temperature section and switches, carries out the enlargies of different multiples to the voltage signal in the different gears, and signal voltage surpasses the condition of sampling range under same circumstances that this method can be perfect solution.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a block diagram of the system hardware architecture of the present invention;
fig. 2 is an output voltage acquisition circuit according to an embodiment of the present invention;
fig. 3 is a temperature acquisition circuit of the E-type thermocouple temperature sensor according to the embodiment of the present invention;
figure 4 the utility model discloses cold junction compensating circuit.
Detailed Description
The technical solutions in the embodiments will be described below clearly and completely in connection with the accompanying drawings in the embodiments of the present invention, however, it should be understood that the present invention can be implemented in various forms without being limited to the embodiments set forth herein, but on the contrary, these embodiments are provided for better understanding of the present invention and can fully convey the scope of the present invention to those skilled in the art.
It will be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, and/or components.
Referring to fig. 1, it is the hardware structure block diagram of the embodiment of the present invention, which comprises a communication circuit 7, a temperature acquisition circuit 2, a central processing unit 0, an output voltage acquisition circuit 1, a heating rod 5, a cold junction compensation circuit 4, and a temperature sensor 6.
The communication circuit, the temperature acquisition circuit and the output voltage acquisition circuit are coordinated and distributed by the central processing unit, and the cold end compensation circuit is mainly used for correspondingly correcting errors according to the type of the temperature sensor. The communication circuit mainly sends temperature data to the PC end, and the signal after the cold junction compensating circuit compensation is passed through to the signal that temperature acquisition circuit gathered temperature sensor production, and output voltage acquisition circuit mainly controls voltage signal to heating rod both ends voltage and MOS pipe.
The input end of the central processing unit is respectively connected with the two 24-bit AD acquisition chips, the gear adjustment chip and the digital-to-analog conversion chip, the gear adjustment chip is electrically connected with the cold end temperature compensation circuit, the cold end temperature compensation is connected with the temperature acquisition thermocouple, and the central processing unit is optically connected with 10 HCPL062N to enable the temperature acquisition circuit, the output voltage acquisition circuit and the MCU to be isolated. The embodiment of the utility model provides an in adopt the thermocouple as temperature sensor. And acquiring a target temperature by adopting a thermocouple, comparing the target temperature with a set temperature, starting PID (proportion integration differentiation) to intervene in controlling the heating voltage when the target temperature is higher than the set temperature, and slowly adjusting the output voltage to ensure that the temperature gradually approaches to the set temperature and is stabilized at the set temperature. In the process, the heating rod is always in the working state and is not like a switch for heating to control the temperature, and in the process, the output voltage of the heating end also needs to be accurately controlled so as to quickly stabilize the target temperature. The specific control system is shown in the attached drawing of the system structure.
Preferably, the 2 24-bit AD acquisition chips respectively acquire output voltage, current sampling resistor voltage and thermocouple voltage, and are respectively supplied with power by respective independent power modules, so that the output voltage, the current sampling resistor voltage and the thermocouple voltage are not interfered with each other.
Preferably, the input end of the digital-to-analog conversion chip is optically coupled with the HCPL062N, and the output end of the digital-to-analog conversion chip is connected with the 2-stage amplification circuit and the voltage follower circuit to ensure that the voltage input to the AD acquisition chip end is stable and effective.
Preferably, the gain adjusting end of the gear adjusting chip is connected with the HCPL062N, the input end of the gear adjusting chip is electrically connected with the cold end compensation circuit, and the output end of the gear adjusting chip forms a differential signal after passing through the full input/output differential amplifier and then is input into the AD acquisition chip.
The utility model discloses owing to adopt 24 AD to gather the chip and make the temperature resolution ratio of gathering very high for the temperature that reads out is more accurate reliable. At this one of PID control heating, adjust and control the heating for PWM commonly used, the utility model discloses a control circuit with negative feedback can be so that the mv rank that the heating control precision improves and the security of having guaranteed the output, the heating can not be out of control, DAC8562 digital-to-analog conversion circuit converts control signal to analog signal and adjusts power output for power adjustment is more exquisite, big or small electric current switching circuit has both guaranteed that the programming rate is fast also the accuse temperature stability of guaranteeing simultaneously high, adopt 24 AD chips equally, guarantee that the sampling precision is high. According to the utility model discloses circuit design sees, for ordinary temperature control circuit, the utility model discloses can fast accuse temperature, accuse temperature stability is high, accuse temperature precision is high, can guarantee within 0.05 degree.
Thermocouple voltage and output voltage, current sampling resistance voltage are gathered respectively through two ways of independent AD acquisition circuit, according to thermocouple voltage adjustment output voltage, adopt voltage gear automatically regulated to control the thermocouple voltage of gathering simultaneously to wide temperature voltage signal acquisition and can not exceed and gather chip voltage acquisition range, and current sampling resistance voltage signal is then used for accurate adjustment output voltage, makes output voltage subdivision degree higher.
Referring to fig. 2, it is the output voltage acquisition circuit of the embodiment of the present invention, which is mainly divided into two parts of heating terminal voltage and control terminal voltage acquisition, wherein, the MCU (central processing unit) signal forms an analog signal after passing through the digital-to-analog conversion circuit, and the signal forms a negative feedback after passing through the two-stage operational amplification circuit, and is used as the gate control signal of the MOS transistor after being fed back by the source signal of the MOS transistor; the relay K400 is used as an output current grading switch to distinguish the collection of large current and small current, and meanwhile, the voltage of the source current of the MOS tube after flowing through the sampling resistor is collected by an ADS1256 chip after being subjected to LM7301 operational amplification; the drain of the MOS tube is used as the voltage at one end of the heating rod and the heating voltage HV +, and a pair of differential signals are formed after the LM7301 operational amplification and enter the acquisition chip. Specifically, as shown in fig. 2, the output voltage acquisition circuit includes: the digital-to-analog conversion circuit is composed of a voltage output DAC (DAC8562) of 16-bit ultra-low burr pulses, and mainly has the functions that digital signals output by the MCU are converted into MOS tube driving signals, and stable and controllable driving voltage is provided for the gate of the MOS tube; the MOS tube drives a signal amplifying circuit, an OPA2188 operational amplification chip amplifies two paths to form a negative feedback regulation output circuit, and the MOS tube source signal and the grid signal ensure the stability of output and the anti-interference performance through the two paths of amplifying circuits; the current control circuit is composed of two high-precision low-power-consumption resistors and a relay control circuit, and large current and small current are switched through a relay, so that the output current can be controlled to be 1A; and the sampling circuit is divided into an MOS tube source current sampling circuit and voltage sampling circuits at two ends of the heating tube, and the sampling circuits are amplified by the LM7301 operational amplifier and then acquired by a 24-bit high-precision ADC sampling chip ADS1256 in a single-channel mode.
Refer to fig. 3, it does the utility model discloses temperature sensor temperature acquisition circuit, the temperature sensor signal who comes through the cold junction compensation all is the signal of comparison small usually, the thermocouple is different at the voltage signal size of the temperature section of difference, so need the gear to adjust the chip and amplify the adjustment to the signal, there is three gear 1, 10, 100 times, output voltage signal all the way after gear switching amplifier circuit for the signal is more stable, the interference killing feature is strong, so add differential signal converting circuit, send for MCU after gathering through ADS1256 chip by signal output two way differential signal all the way. The relationship between AD reading and thermocouple voltage is: vad ═ Vtc × 100 × GAIN; vad is the voltage value read by the AD chip; vtc is the raw voltage value of the thermocouple; 100 is the fixed amplification of the cold end compensation circuit. The target temperature at this time is obtained by looking up the score table. Specifically, as shown in fig. 3, the temperature acquisition circuit includes: firstly, an input signal amplifying circuit is mainly used for gear adjustment, and a professional gear adjusting chip LTC6910 is selected to form the amplifying circuit; the differential signal conversion circuit is used for forming a group of differential signals by signals output from the gear adjusting circuit through the LTC1992, and the acquired thermocouple signals have higher resolution ratio due to the fact that the characteristics of the differential signals can distinguish tiny signals and anti-electromagnetic interference capability; and the acquisition circuit acquires thermocouple signals through a differential mode by using a 24-bit high-precision ADC (ADS1256), and the 2.5V reference circuit enables the chip to acquire more accurately.
Referring to fig. 4, it is the utility model discloses cold junction compensating circuit, mainly the thermocouple temperature sensor to different models, professional cold junction compensating chip passes through dial switch input and gets into and has zero drift operational amplifier and form voltage follower circuit, the reference signal pin that the compensation voltage that produces by the compensating chip passes through LTC2053 attaches to thermocouple voltage signal on, LTC2053 linear amplifier's effect is exactly with input signal and reference signal add the back input and carry out 100 times's signal amplification in advancing AD8622 operational amplification circuit, because the signal is too small, so need be convenient for after the amplification to gather the calculation. Specifically, as shown in fig. 4, the cold-end compensation circuit includes: firstly, an input signal linear amplification circuit is formed by R800, R801, R805 and R806 to form a 2.5V pull-up signal, and an output signal is formed by an input voltage and a reference voltage at the moment; a voltage following circuit, wherein an LT1025 cold-end compensation chip can provide 4 thermocouple compensation functions, and compensated voltage forms a voltage following signal through an LTC2050 to serve as reference voltage of the LTC 2053; and thirdly, a signal amplification circuit is formed by a dual-channel precision amplifier AD8622, and the amplification zeroing and gain adjustment of the circuit are carried out through two adjustable resistors R804 and R817.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and a part not described in detail in a certain embodiment may be referred to the related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
The above description is for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A temperature controller is characterized by comprising a central processing unit, and a temperature acquisition circuit, an output voltage acquisition circuit and a communication circuit which are connected with the central processing unit; the temperature controller also comprises a cold end compensation circuit connected with the temperature acquisition circuit and a heating rod connected with the output voltage acquisition circuit; the communication circuit is connected with an external PC end;
the temperature controller also comprises a temperature sensor connected with the cold end compensation circuit.
2. The temperature controller of claim 1, wherein the temperature acquisition circuit acquires a signal generated by the temperature sensor compensated by the cold end compensation circuit, and the output voltage acquisition circuit acquires a voltage across the heating rod.
3. The temperature controller according to claim 1, wherein the output voltage acquisition circuit comprises a digital-to-analog conversion circuit, a MOS transistor driving signal amplification circuit, a current control circuit, and a sampling circuit, which are connected in sequence, the digital-to-analog conversion circuit is connected to the central processing unit, and converts a signal output by the central processing unit into an analog signal through digital-to-analog conversion, the analog signal is amplified in two stages by the MOS transistor driving signal amplification circuit to form a negative feedback as the MOS transistor driving signal, and the sampling circuit comprises a MOS transistor source current sampling circuit and a voltage sampling circuit at two ends of the heating rod.
4. The temperature controller according to claim 1, wherein the temperature acquisition circuit comprises an input signal amplification circuit, a differential signal conversion circuit and an acquisition circuit, the input signal amplification circuit amplifies the acquired temperature sensing signal through a shift adjusting chip, the differential signal conversion circuit converts the amplified signal output by the input signal amplification circuit into a differential signal, and the acquisition circuit acquires the differential signal and then sends the differential signal to the central processing unit.
5. The temperature controller according to claim 1, wherein the cold end compensation circuit comprises an input signal linear amplification circuit, a voltage follower circuit and a signal amplification circuit, the input signal linear amplification circuit linearly amplifies the voltage signal of the temperature sensor, the voltage follower circuit compensates the linearly amplified voltage signal to form a voltage follower signal and adds the voltage follower signal as a reference signal to the voltage signal of the temperature sensor, and the signal amplification circuit adds the input signal and the reference signal and amplifies the added signal.
6. The temperature controller according to any one of claims 1 to 5, wherein the temperature sensor is a thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021849388.XU CN212569562U (en) | 2020-08-28 | 2020-08-28 | Temperature controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021849388.XU CN212569562U (en) | 2020-08-28 | 2020-08-28 | Temperature controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212569562U true CN212569562U (en) | 2021-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021849388.XU Active CN212569562U (en) | 2020-08-28 | 2020-08-28 | Temperature controller |
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| Country | Link |
|---|---|
| CN (1) | CN212569562U (en) |
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2020
- 2020-08-28 CN CN202021849388.XU patent/CN212569562U/en active Active
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