Single-path temperature controller

Abstract

The utility model discloses a single-path temperature controller which comprises a temperature acquisition circuit, an AD amplification and conversion circuit, a reference voltage circuit, a cold end detection circuit, an MCU, a communication circuit and a heating control circuit. During working, the temperature acquisition circuit acquires a temperature signal of production equipment, and the cold end detection circuit acquires an environment temperature signal of the production equipment for cold end compensation; then the MCU inquires a voltage-temperature data table based on temperature signals collected by the two circuits to calculate the final temperature of the production equipment, the final temperature is compared with a set target temperature, a control signal is generated and output to the heating control circuit, and the heating control circuit communicates with the 220V heating power supply circuit according to the control signal to supply power to the heating device for heating. And the temperature control of the production equipment is realized. The single-path temperature controller is simple in structure, low in manufacturing cost, high in anti-interference capability and high in measurement precision.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature detection and control, and particularly relates to a single-channel temperature controller. Background Art

[0002] In various industrial controls, such as equipment like sol machines and pulp machines, temperature measurement and control are very important links. Too low or too high temperature will cause defects in product forming. In industrial pipelines, the temperature change will have a significant impact on the production process. Too high or too low temperature may lead to pipeline deformation, rupture or corrosion, thus affecting the normal operation and safety of the pipeline. Temperature detection is usually also used in the operation of transformers to confirm the operation status of the transformers. In public buildings equipped with a central air-conditioning system, except for public areas such as lobbies, meeting rooms and elevator halls, a fan coil system is basically adopted, and the core of the fan coil system is also a temperature control system, which has very high requirements for temperature detection accuracy and control accuracy. Therefore, a good temperature controller has high measurement accuracy, good control accuracy, quick response, and can bring significant energy-saving benefits to the system and improve the finished product quality. Summary of the Invention

[0003] The main purpose of the utility model is to overcome the deficiencies of the prior art and provide a single-channel temperature controller.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A single-channel temperature controller includes a temperature acquisition circuit, an AD amplification and conversion circuit, a reference voltage circuit, a cold end detection circuit, an MCU, a communication circuit and a heating control circuit;

[0006] The output end of the temperature acquisition circuit is connected to the input end of the AD amplification and conversion circuit; the temperature acquisition circuit inputs the temperature signal of the production equipment collected into the AD amplification and conversion circuit for signal amplification, filtering and conversion;

[0007] The output end of the reference voltage circuit is respectively connected to the input end of the AD amplification and conversion circuit and the input end of the cold end detection circuit;

[0008] The input end of the MCU is respectively connected to the output end of the AD amplification and conversion circuit, the output end of the communication circuit and the output end of the cold end detection circuit;

[0009] The communication circuit is connected to the upper computer, receives the set target temperature set by the upper computer and reports the measured temperature of the production equipment in real time;

[0010] The output end of the MCU is connected to the input end of the heating control circuit;

[0011] The output end of the heating control circuit is respectively connected to the 220V heating power supply circuit and the heating device of the production equipment to achieve temperature control;

[0012] When the single-channel temperature controller works, the temperature acquisition circuit acquires the temperature signal of the production equipment, inputs it into the MCU through the AD amplification and conversion circuit, and the cold-end detection circuit acquires the ambient temperature signal of the production equipment and inputs it into the MCU; the MCU fuses the output signal of the AD amplification and conversion circuit and the output signal of the cold-end detection circuit, calculates the final temperature of the production equipment by querying the voltage-temperature data table, and compares it with the set target temperature to generate a control signal and output it to the heating control circuit; the heating control circuit supplies power to the heating device by connecting the 220V heating power supply circuit according to the control signal to realize the temperature control of the production equipment.

[0013] Preferably, the temperature acquisition circuit is a thermal resistor, a thermistor or a thermocouple.

[0014] Preferably, the AD amplification and conversion circuit includes a signal amplification circuit, a filtering circuit, a signal protection circuit and an analog-to-digital conversion circuit connected in sequence.

[0015] Preferably, the analog-to-digital conversion circuit is a CS1237 high-precision AD converter and its peripheral circuit.

[0016] Preferably, the signal protection circuit is a BAT54S clamping circuit.

[0017] Preferably, the reference voltage circuit is a TL431 voltage regulator.

[0018] Preferably, the cold-end detection circuit is a temperature acquisition circuit using a CS1237 chip, measures the ambient temperature of the production equipment using the internal temperature sensor of the CS1237 chip, and is calibrated using a standard mercury thermometer.

[0019] Preferably, the MCU is a GD32F103CBT6 microcontroller or an STM32F103CBT6 microcontroller.

[0020] Preferably, the communication circuit uses an RS485 serial communication interface.

[0021] Preferably, the heating control circuit is a control circuit composed of an optocoupler EL357, an isolation device MOC3020SM and a triac BTB16Q-600BW; among them, the P4 port in the heating control circuit is connected to the heating device of the production equipment, and the P6 port in the heating control circuit is connected to the 220V heating power supply circuit.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] In the single-channel temperature controller of the present utility model, the temperature acquisition circuit acquires the temperature signal of the production equipment, and the cold-end detection circuit acquires the ambient temperature signal of the production equipment for cold-end compensation; then the MCU queries the voltage-temperature data table based on the temperature signals acquired by the two circuits to calculate the final temperature of the production equipment, and then compares it with the set target temperature to generate a control signal and output it to the heating control circuit, and realizes the temperature control of the production equipment by controlling the heating device of the production equipment. To ensure the correctness of data acquisition, the reference voltages of the temperature acquisition circuit and the cold-end detection circuit are both completed by the reference voltage circuit. At the same time, the AD amplification and conversion circuit is used to perform noise reduction processing on the temperature signal acquired by the temperature acquisition circuit to ensure the accuracy of the signal. The single-channel temperature controller of the present application has a simple structure, low manufacturing cost, strong anti-interference ability and high measurement accuracy. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a single-channel temperature controller in the present utility model.

[0025] Figure 2 It is a schematic circuit diagram of the AD amplification and conversion circuit in the present utility model.

[0026] Figure 3 It is a schematic circuit diagram of the reference voltage circuit in the present utility model.

[0027] Figure 4 It is a schematic circuit diagram of the cold-end detection circuit in the present utility model.

[0028] Figure 5 It is a chip schematic diagram of the GD32F103CBT6 microcontroller in the present utility model.

[0029] Figure 6 It is a schematic circuit diagram of the communication circuit in the present utility model.

[0030] Figure 7 It is a schematic circuit diagram of the heating control circuit in the present utility model. Detailed Embodiments

[0031] The following will further describe the present utility model in detail in conjunction with embodiments and drawings, but the implementation manners of the present utility model are not limited thereto.

[0032] As Figure 1 shown, this embodiment provides a single-channel temperature controller, including a temperature acquisition circuit, an AD amplification and conversion circuit, a reference voltage circuit, a cold-end detection circuit, an MCU, a communication circuit and a heating control circuit;

[0033] Among them, the output end of the temperature acquisition circuit is connected to the input end of the AD amplification and conversion circuit; the temperature acquisition circuit is used to collect the temperature signal of the production equipment, and then input it into the AD amplification and conversion circuit for signal amplification, filtering and conversion to ensure the accuracy of the temperature signal.

[0034] The output end of the reference voltage circuit is respectively connected to the input end of the AD amplification and conversion circuit and the input end of the cold end detection circuit; the reference voltage circuit is used to output a stable reference voltage for the AD amplification and conversion circuit and the cold end detection circuit to perform accurate calculations to ensure the correctness of the data.

[0035] The input ends of the MCU are respectively connected to the output end of the AD amplification and conversion circuit, the output end of the communication circuit and the output end of the cold end detection circuit; the output end of the MCU is connected to the input end of the heating control circuit. The output end of the heating control circuit is respectively connected to the 220V heating power supply circuit and the heating device of the production equipment to realize temperature control;

[0036] The communication circuit is also connected to the upper computer, for the upper computer to set the target temperature and report the temperature of the production equipment measured in real time.

[0037] In this application, when the single-channel temperature controller works, the temperature acquisition circuit collects the temperature signal of the production equipment and inputs it into the MCU through the AD amplification and conversion circuit, and the cold end detection circuit collects the ambient temperature signal of the production equipment and inputs it into the MCU; the MCU fuses the output signal of the AD amplification and conversion circuit and the output signal of the cold end detection circuit, calculates the final temperature of the production equipment by querying the temperature data table, and compares it with the set target temperature to generate a control signal and output it to the heating control circuit; the heating control circuit supplies power to the heating device by connecting the 220V heating power supply circuit according to the control signal to realize the temperature control of the production equipment. When the final temperature of the production equipment calculated by the MCU is lower than the set target temperature, a heating signal is output. At this time, the heating control circuit connects the 220V heating power supply circuit to supply power to the heating device according to the control signal; if it is higher, a stop heating signal is output, and the heating control circuit disconnects the 220V heating power supply circuit according to the control signal to stop supplying power to the heating device, and finally completes the temperature control of the production equipment.

[0038] Furthermore, the temperature acquisition circuit can be a temperature collector such as a thermal resistor, a thermistor or a thermocouple.

[0039] Furthermore, the AD amplification and conversion circuit includes a signal amplification circuit, a filtering circuit, a signal protection circuit and an analog-to-digital conversion circuit connected in sequence.

[0040] In this embodiment, the temperature acquisition circuit uses a thermocouple, and the analog-to-digital conversion circuit uses a CS1237 high-precision AD converter and its peripheral circuit. AsFigure 2 As shown in the figure, P7 in the AD amplification and conversion circuit is connected to a thermal resistor. After the temperature signal of the production equipment collected is amplified by the signal amplification circuit, filtered by the filter circuit, and protected by the signal protection circuit, it is sent into the CS1237 high-precision AD converter for conversion. The converted signal is sent into the MCU from the DRDY / DOUT pin for the MCU to process. In this embodiment, the signal protection circuit is a BAT54S clamping circuit.

[0041] Further, as Figure 3 shown in the figure, the reference voltage circuit uses a TL431 voltage regulator, and its voltage regulation accuracy can reach 1%, which can meet the high-precision requirements of the reference voltage for the AD amplification and conversion circuit and the cold-end detection circuit.

[0042] Further, as Figure 4 shown in the figure, the cold-end detection circuit is a temperature acquisition circuit based on the CS1237 chip. It uses the internal temperature sensor of the CS1237 chip to measure the ambient temperature of the production equipment and is calibrated with a standard mercury thermometer.

[0043] Further, the MCU is a GD32F103CBT6 microcontroller or an STM32F103CBT6 microcontroller. In this embodiment, as Figure 5 shown in the figure, the MCU uses a GD32F103CBT6 microcontroller. Four IO pins of the MCU are respectively connected to the output ends of the AD amplification and conversion circuit and the cold-end detection circuit for receiving temperature signals. After the MCU receives the temperature signals from the two circuits, it fuses them, then obtains the final temperature of the production equipment by querying the voltage-temperature data table, and compares it with the set target temperature to generate a control signal and output it to the heating control circuit.

[0044] Further, as Figure 6 shown in the figure, the communication circuit uses an RS485 serial communication interface to provide an interface for the host computer, which is used for the host computer to set the set target temperature and report the temperature of the production equipment collected in real time.

[0045] Further, as Figure 7 shown in the figure, the heating control circuit is a control circuit composed of an optocoupler EL357, an isolation device MOC3020SM, and a triac BTB16Q-600BW. Among them, the P4 port in the heating control circuit is connected to the heating device, and the P6 port in the heating control circuit is connected to the 220V heating power supply circuit. The control signal output by the MCU enters from the input end of the EL357 optocoupler, and controls the on and off of the triac BTB16Q-600BW through the isolation device MOC3020SM, thereby realizing the on and off of the 220V heating power supply circuit and the heating device, and thus realizing the control of the heating device of the production equipment.

[0046] It should also be noted that in this specification, terms such as "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-channel temperature controller, characterized in that: It includes temperature acquisition circuit, AD amplification and conversion circuit, reference voltage circuit, cold end detection circuit, MCU, communication circuit and heating control circuit; The output end of the temperature acquisition circuit is connected to the input end of the AD amplification and conversion circuit; the temperature acquisition circuit inputs the collected temperature signal of the production equipment into the AD amplification and conversion circuit for signal amplification, filtering and conversion; The output end of the reference voltage circuit is connected to the input end of the AD amplification and conversion circuit and the input end of the cold end detection circuit respectively; The input end of the MCU is respectively connected to the output end of the AD amplification and conversion circuit, the output end of the communication circuit and the output end of the cold end detection circuit; The communication circuit is connected to the host computer, receives the set target temperature set by the host computer and reports the measured production equipment temperature in real time; The output end of the MCU is connected to the input end of the heating control circuit; The output end of the heating control circuit is connected to the 220V heating power supply circuit and the heating device of the production equipment respectively to achieve temperature control; When the single-channel temperature controller is working, the temperature acquisition circuit collects the temperature signal of the production equipment and inputs it into the MCU through the AD amplification and conversion circuit, and the cold-end detection circuit collects the ambient temperature signal of the production equipment and inputs it into the MCU; the MCU merges the output signal of the AD amplification and conversion circuit and the output signal of the cold-end detection circuit, calculates the final temperature of the production equipment by querying the voltage-temperature data table, and compares it with the set target temperature to generate a control signal output to the heating control circuit; the heating control circuit connects to the 220V heating power supply circuit according to the control signal to power the heating device for heating, thereby realizing temperature control of the production equipment.

2. A single-channel temperature controller as claimed in claim 1, characterized in that: The temperature acquisition circuit is a thermal resistor, a thermistor or a thermocouple.

3. A single-channel temperature controller as claimed in claim 1, characterized in that: The AD amplification and conversion circuit comprises a signal amplification circuit, a filtering circuit, a signal protection circuit and an analog-to-digital conversion circuit which are connected in sequence.

4. A single-channel temperature controller as claimed in claim 3, characterized in that: The analog-to-digital conversion circuit is a CS1237 high-precision AD converter and its peripheral circuits.

5. A single-channel temperature controller as claimed in claim 3, characterized in that: The signal protection circuit is a BAT54S clamping circuit.

6. A single-channel temperature controller as claimed in claim 1, characterized in that: The reference voltage circuit is a TL431 voltage regulator.

7. A single-channel temperature controller as claimed in claim 1, characterized in that: The cold end detection circuit is a temperature acquisition circuit using a CS1237 chip. The temperature sensor inside the CS1237 chip is used to measure the ambient temperature of the production equipment, and a standard mercury thermometer is used for calibration.

8. A single-channel temperature controller as claimed in claim 1, characterized in that: The MCU is a GD32F103CBT6 microcontroller or a STM32F103CBT6 microcontroller.

9. A single-channel temperature controller as claimed in claim 1, characterized in that: The communication circuit adopts RS485 serial communication interface.

10. A single-channel temperature controller as claimed in claim 1, characterized in that: The heating control circuit is a control circuit composed of an optocoupler EL357, an isolation device MOC3020SM and a bidirectional thyristor BTB16Q-600BW; wherein the P4 port in the heating control circuit is connected to the heating device of the production equipment, and the P6 port in the heating control circuit is connected to the 220V heating power supply circuit.

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