High-precision automatic temperature regulation control device

Abstract

The utility model discloses a high-precision automatic temperature regulation control device, which comprises a data acquisition part, a data comparison and analysis part and a peripheral control circuit part, the data acquisition part acquires environment temperature data through a temperature sensor, the environment temperature data are compared through the data comparison and analysis part, the peripheral control circuit is driven according to a comparison result, and then the working mode of the temperature adjusting equipment is controlled through the peripheral control circuit. The high-precision automatic temperature adjustment control device has the advantages of being capable of automatically adjusting temperature, simple in operation, high in precision, high in isolation voltage, simple in circuit, stable in work and high in reliability.

Description

Technical Field

[0001] This utility model relates to a temperature control circuit, specifically, to a high-precision autonomous temperature control device. Background Technology

[0002] Temperature is one of the most fundamental physical quantities in life and production, characterizing the degree of hotness or coldness of an object. Every physical and chemical process in nature is closely related to temperature. In many production processes, temperature measurement and control are directly linked to major technical indicators such as safe production, improved production efficiency, guaranteed product quality, and energy conservation. Therefore, temperature measurement and control have received considerable attention in all sectors of the national economy. In actual production and experimental environments, because heat exchange between the system's internal environment and the external environment is difficult to control, and interference from other heat sources cannot be accurately calculated, temperature changes are often affected by unpredictable external environmental disturbances. To make the energy exchange between the system and the external environment as compatible as possible with human requirements, other means are needed to achieve this insulation goal. For example, the temperature of the external environment of the target system can be synchronized with its internal temperature. According to the second law of thermodynamics, two systems at the same temperature are in thermal equilibrium. Thus, by using an isolation layer whose temperature is synchronized with the target system, the target system can be thermally isolated from the external environment. Furthermore, in most practical environments, heating is much easier than cooling. Therefore, in applications requiring high temperature control precision, overshoot is unacceptable; that is, the actual temperature must not exceed the target temperature. This is especially true in environments with excellent insulation, where overshoot makes it difficult to quickly reduce the temperature. This is because many applications only have heating elements and lack cooling devices. Similarly, in applications with only cooling and no heating, an actual temperature lower than the target temperature significantly impacts the control performance.

[0003] Therefore, ensuring the normal and efficient operation of electronic equipment and effectively solving the problem of precise temperature control are of paramount importance.

[0004] The technical solution of this application adopts a temperature control circuit, which collects data through a temperature sensor, analyzes and processes the data through a high-precision digital comparison circuit, and completes the control of the peripheral control circuit. It is a high-precision autonomous temperature control device that solves the problems of low accuracy, poor reliability, and inability to perform multiple functions caused by the use of temperature switch components in traditional control methods. Utility Model Content

[0005] This utility model is a high-precision autonomous temperature control device designed to solve the above-mentioned technical problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A high-precision autonomous temperature control device includes a data acquisition section, a data comparison and analysis section, and a peripheral control circuit section. The data acquisition section collects ambient temperature data via a temperature sensor, compares the data with the ambient temperature data via the data comparison and analysis section, and drives the peripheral control circuit based on the comparison result. The peripheral control circuit then controls the operating mode of the temperature regulating device. The data acquisition section includes a temperature sensor and its peripheral circuit. The temperature sensor is placed in the environment where the temperature to be controlled is located. The CT1 pin of the temperature sensor is connected to the non-inverting input of comparator U1 via resistor R3. 28 is grounded; the CT2 pin of the temperature sensor is connected to the output of the three-terminal regulator U5 through resistor R1. At the same time, the CT2 pin is connected to the negative terminal of the Zener diode U2, and the positive terminal of the Zener diode U2 is grounded; the data comparison and analysis section includes comparator U1 and its peripheral circuit. The inverting input of comparator U1 is connected to the output of the three-terminal regulator U5 through resistors R4 and R2 connected in series. At the same time, the inverting input of comparator U1 is connected to the negative terminal of the Zener diode U3 through resistor R4, and the positive terminal of the Zener diode U3 is grounded; the output of comparator U1 is connected to the drive terminal A of the peripheral control circuit through resistor R6.

[0008] The high-precision autonomous temperature control device includes a peripheral control circuit comprising a MOSFET Q1 and a Zener diode U4. The gate of the MOSFET Q1 is connected to the driving terminal A and the negative terminal of the Zener diode U4. The positive terminal of the Zener diode U4 is grounded. The source of the MOSFET Q1 is grounded. The drain of the MOSFET Q1 is connected to the control terminal FM of the temperature control device.

[0009] The high-precision autonomous temperature control device includes an optocoupler U5 in its peripheral control circuit. The primary side of the optocoupler U5 is connected to the driving terminal A, and the two secondary sides of the optocoupler U5 are connected to the control terminals X1 and X2 of the temperature regulating device, respectively.

[0010] The high-precision autonomous temperature control device uses a CTTS-125670-1 sensor as its temperature sensor. The sensor operates in the range of -20℃ to 100℃, and the resistance at the sensor's output terminal varies from 960KΩ to 680Ω within this temperature range.

[0011] The high-precision autonomous temperature control device uses a high-precision digital comparison circuit for signal analysis and comparison in its data comparison and analysis section. Comparator U1 uses a dual operational amplifier of model LM358CC. Zener diode U2 has a regulated output of 5.0V, and Zener diode U3 has a regulated output of 2.5V.

[0012] The high-precision autonomous temperature control device uses an IRFPG50 enhancement-mode field-effect transistor as the MOS transistor Q1 and a Zener diode U4 with a regulated output of 18V.

[0013] The high-precision autonomous temperature control device uses an EL817 optocoupler U5.

[0014] This controller is mainly used in temperature control circuits. It collects data through temperature sensors, analyzes and processes the data through a high-precision digital comparison circuit, and completes the control of the peripheral control circuit. It features adjustable temperature, simple operation, high precision, and high isolation voltage. This device is mainly used in the auxiliary control circuits of electronic devices with temperature control requirements.

[0015] 1. Working principle

[0016] This controller is mainly used in temperature control circuits. It collects data through a temperature sensor, specifically a temperature sensor series product manufactured by GE (USA). This sensor can operate within the range of -20℃ to 100℃. Within this range, the resistance at the sensor output terminal can vary from approximately 960KΩ to 680Ω, meaning the higher the monitored temperature, the lower the resistance at both ends of the sensor. This resistance, along with a voltage divider resistor, divides a 5.0V reference voltage and sends it to the non-inverting input of a high-precision comparator. Simultaneously, a 2.5V reference voltage is sent to the inverting input. By adjusting the voltage divider resistor, the input voltage at the non-inverting input is changed. When the voltage at the non-inverting input is higher than that at the inverting input, the high-precision comparator outputs a high bit, connecting the subsequent circuit. When the temperature drops below the set point, the sensor resistance increases, and the voltage division at the non-inverting input decreases. When the voltage at the non-inverting input is lower than that at the inverting input, the high-precision comparator outputs a low bit, disconnecting the subsequent circuit.

[0017] 2. Characteristics of the device

[0018] ① Excellent performance, effectively improving reliability.

[0019] This utility model patent addresses several shortcomings of traditional temperature switch methods by introducing a completely new design and improvement. It effectively avoids the problems associated with temperature switches, such as poor accuracy, susceptibility to damage, and low isolation voltage. This significantly improves control accuracy and reliability.

[0020] ②The circuit is simple and operates stably.

[0021] The technical solution of this application is composed of basic discrete components, and the entire circuit has a strong tolerance to periodic errors. Assembling the circuit according to the values ​​of the corresponding components calculated based on the original design theory is sufficient to meet the technical specifications. Furthermore, the circuit has high anti-disturbance capability and can still operate stably. The temperature setpoint can be adjusted by fine-tuning the voltage divider resistors.

[0022] ③ Wide range of applications

[0023] This invention features adjustable temperature, high precision, diverse peripheral control circuits, and requires no independent auxiliary power supply. Its main operating state is unaffected by downstream equipment, thus greatly expanding its application scope.

[0024] The advantages of this invention are: it features adjustable temperature, simple operation, high precision, and high isolation voltage; its circuit is simple, its operation is stable, and its reliability is high. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the principle of this utility model;

[0026] Figure 2 This is a schematic diagram illustrating the application of this utility model in a fan control circuit.

[0027] Figure 3 This is a schematic diagram illustrating the application of this utility model in an overheat protection circuit. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, this utility model discloses a high-precision autonomous temperature control device, comprising a data acquisition section, a data comparison and analysis section, and a peripheral control circuit section. The data acquisition section collects ambient temperature data via a temperature sensor, compares the data through the data comparison and analysis section, and drives the peripheral control circuit based on the comparison result. The peripheral control circuit then controls the operating mode of the temperature regulating device. The data acquisition section includes a temperature sensor and its peripheral circuitry. The temperature sensor is placed in the environment where the temperature to be controlled is to be set. The CT1 pin of the temperature sensor is connected to the non-inverting input of the comparator U1 via a resistor R3. The circuit is grounded via resistor R28; the CT2 pin of the temperature sensor is connected to the output of the three-terminal regulator U5 via resistor R1, and the CT2 pin is connected to the negative terminal of the Zener diode U2, whose positive terminal is grounded; the data comparison and analysis section includes comparator U1 and its peripheral circuitry. The inverting input of comparator U1 is connected to the output of the three-terminal regulator U5 via resistors R4 and R2 connected in series, and the inverting input of comparator U1 is connected to the negative terminal of the Zener diode U3 via resistor R4, whose positive terminal is grounded; the output of comparator U1 is connected to the drive terminal A of the peripheral control circuit via resistor R6.

[0030] like Figure 2As shown, the sensor, model CTTS-125670-1, can operate within the range of -20℃ to 100℃. Within this range, the resistance at the sensor output terminal can vary from approximately 960KΩ to 680Ω, meaning the higher the monitored temperature, the lower the resistance at both ends of the sensor. This resistance, along with R28, divides the 5.0V reference voltage and sends it to the non-inverting input of the high-precision comparator U1. Simultaneously, R2 and U3 send the 2.5V reference voltage to the inverting input. By adjusting the voltage divider resistor R28, the input voltage at the non-inverting input terminal is changed. When the voltage at the non-inverting input terminal is higher than that at the inverting input terminal, the high-precision comparator U1 outputs a high bit, driving Q1 to connect the subsequent circuit. When the temperature drops below the set point, the sensor resistance increases, and the voltage division at the non-inverting input terminal decreases. When the voltage at the non-inverting input terminal is lower than that at the inverting input terminal, the high-precision comparator U1 outputs a low bit, Q1 is turned off, and the subsequent circuit is disconnected.

[0031] The high-precision autonomous temperature control device includes a peripheral control circuit comprising a MOSFET Q1 and a Zener diode U4. The gate of the MOSFET Q1 is connected to the driving terminal A and the negative terminal of the Zener diode U4. The positive terminal of the Zener diode U4 is grounded. The source of the MOSFET Q1 is grounded. The drain of the MOSFET Q1 is connected to the control terminal FM of the temperature control device.

[0032] like Figure 3 As shown, the high-precision autonomous temperature control device includes an optocoupler U5 in its peripheral control circuit. The primary side of the optocoupler U5 is connected to the driving terminal A, and the two secondary sides of the optocoupler U5 are connected to the control terminals X1 and X2 of the temperature regulating device, respectively.

[0033] The high-precision autonomous temperature control device uses a CTTS-125670-1 sensor as its temperature sensor. The sensor operates in the range of -20℃ to 100℃, and the resistance at the sensor's output terminal varies from 960KΩ to 680Ω within this temperature range.

[0034] The high-precision autonomous temperature control device uses a high-precision digital comparison circuit for signal analysis and comparison in its data comparison and analysis section. Comparator U1 uses a dual operational amplifier of model LM358CC. Zener diode U2 has a regulated output of 5.0V, and Zener diode U3 has a regulated output of 2.5V.

[0035] The high-precision autonomous temperature control device uses an IRFPG50 enhancement-mode field-effect transistor as the MOS transistor Q1 and a Zener diode U4 with a regulated output of 18V.

[0036] The high-precision autonomous temperature control device uses an EL817 optocoupler U5.

[0037] This invention may be used not only in fan control circuits (such as...) Figure 2 As shown), with appropriate adjustments, it can also be used in overheat protection circuits (such as...). Figure 3 (As shown).

[0038] This utility model is not limited to the above-described preferred embodiments. Any other products that are the same as or similar to this utility model and derived by anyone under the guidance of this utility model shall fall within the protection scope of this utility model.

Claims

1. A high-precision autonomous temperature control device, comprising a data acquisition section, a data comparison and analysis section, and a peripheral control circuit section; characterized in that: The data acquisition section collects ambient temperature data through a temperature sensor, compares the data through a data comparison and analysis section, and drives the peripheral control circuit based on the comparison result. The peripheral control circuit then controls the operating mode of the temperature regulating device. The data acquisition section includes a temperature sensor and its peripheral circuitry. The temperature sensor is placed in the environment where the temperature to be controlled is located. The CT1 pin of the temperature sensor is connected to the non-inverting input of comparator U1 through resistor R3, and the CT1 pin is grounded through resistor R28. The CT2 pin of the temperature sensor is connected to the output of a three-terminal voltage regulator U5 through resistor R1. Simultaneously, the CT2 pin is connected to the negative terminal of Zener diode U2, and the positive terminal of Zener diode U2 is grounded. The data comparison and analysis section includes a comparator U1 and its peripheral circuitry. The inverting input of comparator U1 is connected to the output of three-terminal voltage regulator U5 through series resistors R4 and R2. Simultaneously, the inverting input of comparator U1 is connected to the negative terminal of Zener diode U3 through resistor R4, and the positive terminal of Zener diode U3 is grounded. The output of comparator U1 is connected to the drive terminal A of the peripheral control circuit through resistor R6.

2. The high-precision autonomous temperature control device according to claim 1, characterized in that: The peripheral control circuit includes a MOSFET Q1 and a Zener diode U4. The gate of the MOSFET Q1 is connected to the driving terminal A and the negative terminal of the Zener diode U4. The positive terminal of the Zener diode U4 is grounded. The source of the MOSFET Q1 is grounded. The drain of the MOSFET Q1 is connected to the control terminal FM of the temperature regulating device.

3. The high-precision autonomous temperature control device according to claim 1, characterized in that: The peripheral control circuit includes an optocoupler U5. The primary side of the optocoupler U5 is connected to the driving terminal A, and the two ends of the secondary side of the optocoupler U5 are connected to the control terminals X1 and X2 of the temperature regulating device, respectively.

4. The high-precision autonomous temperature control device according to claim 1, characterized in that: The temperature sensor is a CTTS-125670-1 sensor. The sensor operates in the range of -20℃ to 100℃, and the resistance of the sensor output terminal varies in the range of 960KΩ to 680Ω within this temperature range.

5. The high-precision autonomous temperature control device according to claim 1, characterized in that: The data comparison and analysis section uses a high-precision digital comparison circuit to perform signal analysis and comparison. Comparator U1 uses a dual operational amplifier of model LM358CC; the Zener diode U2 has a regulated output of 5.0V, and the Zener diode U3 has a regulated output of 2.5V.

6. The high-precision autonomous temperature control device according to claim 2, characterized in that: The MOSFET Q1 is an enhancement-mode field-effect transistor of model IRFPG50; the Zener diode U4 has a regulated output of 18V.

7. The high-precision autonomous temperature control device according to claim 3, characterized in that: The optocoupler U5 is an EL817 optocoupler.

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