Multi-sensor compatible high-precision temperature controller

Abstract

The utility model discloses a kind of high-precision temperature control instruments of multi-sensor compatibility, comprising: bottom plate, the upper portion of the bottom plate is provided with side plate and is welded and fixed between side plate and floor, the both ends of the bottom plate and side plate are provided with front panel and back cover respectively, the surface of the front panel is provided with power interface, control switch, four-wire system connecting terminal, power output interface and USB interface, the surface of the bottom plate is provided with isolated mounting column and is provided with two groups of isolated ADC module between isolated mounting column.This utility model automatically adapts PT100, thermocouple, diode and other various sensors, without manually switching hardware or complex calibration, greatly improve experiment convenience, four-wire system measurement eliminates wire resistance error completely, strict isolation design maximally restrains interference, multiple isolation protection design improves system anti-interference ability and security, prevent interchannel crosstalk, control integrated structure is compact, abundant local / remote communication interface, convenient integration into automated test system.

Description

Technical Field

[0001] This utility model relates to the field of high-precision temperature controller technology, and more specifically to a high-precision temperature controller compatible with multiple sensors. Background Technology

[0002] Precise control of sample temperature is crucial in precision scientific experiments such as semiconductor probe stations, microelectronic testing, nanoscience and physics research.

[0003] Existing temperature controllers generally suffer from poor sensor compatibility, typically supporting only a single type of sensor. Switching sensors requires manual rewiring and calibration, which is cumbersome, prone to introducing errors, and affects experimental efficiency. Furthermore, they have weak anti-interference capabilities and are susceptible to inter-channel crosstalk when multiple channels are operating simultaneously. External electromagnetic interference or poor grounding can also affect signal acquisition accuracy. Therefore, a new technical solution is needed to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision temperature controller that is compatible with multiple sensors, solving the problem of poor sensor compatibility in existing temperature controllers. They typically only support a single type of sensor, and switching sensors requires manual rewiring and calibration, which is cumbersome and prone to introducing errors, affecting experimental efficiency. At the same time, they have weak anti-interference capabilities and are prone to crosstalk between channels when multiple channels are working simultaneously. External electromagnetic interference or poor grounding also affects the accuracy of signal acquisition.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision temperature controller compatible with multiple sensors, comprising: a base plate, a side plate on the upper part of the base plate and welded and fixed to the base plate, a front panel and a rear cover on both ends of the base plate and the side plate respectively, a power interface, a control switch, a four-wire connection terminal, a power output interface and a USB interface on the surface of the front panel, isolation mounting posts on the surface of the base plate and two sets of isolation ADC modules between the isolation mounting posts, a sensor interface unit, a main controller and a PID control unit on the surface of the base plate, a support column on the upper part of the base plate and an isolation plate on the upper part of the support column, a drive circuit board on the surface of the isolation plate, a circuit board mounting post between the drive circuit board and the isolation plate, and an outer shell on the surface of the side plate, the front panel and the rear cover and the outer shell is fixedly connected to the side plate by bolts.

[0006] In a preferred embodiment of the present invention, the surface of the front panel is provided with an isolation mesh and a cooling fan is provided inside the isolation mesh.

[0007] In a preferred embodiment of this utility model, the side plate has several sets of evenly distributed heat dissipation holes inside.

[0008] In a preferred embodiment of this utility model, the drive circuit board layout adopts at least four layers. The drive circuit board is strictly divided into analog area, digital area, power area and communication area, and physical dividing slots and isolation strips are set between each partition.

[0009] In a preferred embodiment of this utility model, the two sets of isolated ADC modules are stacked one on top of the other and equipped with an isolation cover with vents.

[0010] In a preferred embodiment of this utility model, four power output interfaces are provided, two of which are connected to the constant current source output as excitation terminals, and the other two are directly connected to the signal conditioning circuit input terminal as detection terminals.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention features a side plate on the upper part of a base plate, which is welded and fixed to the base. A front panel and a rear cover are respectively located at both ends of the base plate and side plate. The front panel has a power interface, control switch, four-wire connection terminal, power output interface, and USB interface. The base plate has isolation mounting posts, with two sets of isolated ADC modules positioned between them. A sensor interface unit, main controller, and PID control unit are also located on the base plate. Support columns are located on the upper part of the base plate, with an isolation plate on top of the support columns. A drive circuit board is mounted on the surface of the isolation plate, with a circuit board mounting post between the drive circuit board and the isolation plate. A housing is located on the surfaces of the side plate, front panel, and rear cover, and the housing is fixed to the side plate with bolts. The system includes independent PID control and power output modules for each channel, with each channel containing a PID control unit, an anti-integral saturation mechanism unit, a power drive circuit, signal isolation devices at the sensor input side, ADC front end, power output side, and communication interface, an isolated DC-DC module providing independent isolated power to different functional areas, and a system for implementing analog, digital, power, and communication functions. The system features a multi-layer PCB layout with physical isolation of the signal area, an integrated control and communication chassis, and integrates the main controller unit, sensor interface module, ADC module, PID control module, power output module, and isolation circuit. When using resistive sensors, two power output interfaces connect to the constant current source output as excitation terminals, while the other two power output interfaces directly connect to the signal conditioning circuit input as detection terminals. The PCB layout uses at least four layers, with physical partitions and isolation strips between the analog, digital, power, and communication areas. Key analog signal lines use differential routing and are grounded. A shield is installed in the ADC area. This high-precision temperature controller, compatible with multiple sensors, automatically adapts to various sensors such as PT100, thermocouples, and diodes through a programmable constant current source matrix and relay switching array hardware structure design, eliminating the need for manual hardware switching or complex calibration, greatly improving experimental convenience. Four-wire measurement completely eliminates wire resistance errors, and the strict isolation design minimizes interference. Multiple isolation protection designs enhance the system's anti-interference capability and safety, preventing crosstalk between channels. The integrated control structure is compact and highly integrated. It provides a rich set of local / remote communication interfaces, making it easy to integrate into automated testing systems. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the internal structure of this utility model from another angle;

[0016] Figure 4 This is a schematic diagram of the front panel structure of this utility model;

[0017] Figure 5 This is an adaptive recognition diagram of the sensor of this utility model.

[0018] In the diagram: 1. Front panel; 2. Housing; 3. Side panel; 4. Heat dissipation holes; 5. Base plate; 6. Rear cover; 7. Isolation mounting post; 8. Isolation ADC module; 9. Support post; 10. Circuit board mounting post; 11. Isolation plate; 12. Driver circuit board; 13. Sensor interface unit; 14. Main controller; 15. PID control unit; 16. Power interface; 17. Control switch; 18. Isolation mesh; 19. Cooling fan; 20. Four-wire connection terminal; 21. Power output interface; 22. USB interface. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5This utility model provides a technical solution: a high-precision temperature controller compatible with multiple sensors, comprising: a base plate 5, a side plate 3 provided on the upper part of the base plate 5 and welded and fixed to the floor; a front panel 1 and a rear cover 6 respectively provided at both ends of the base plate 5 and the side plate 3; a power interface 16, a control switch 17, a four-wire connection terminal 20, a power output interface 21 and a USB interface 22 provided on the surface of the front panel 1; isolation mounting posts 7 provided on the surface of the base plate 5 and two sets of isolation ADC modules 8 provided between the isolation mounting posts 7; a sensor interface unit 13, a main controller 14 and a PID control unit 15 provided on the surface of the base plate 5; and a support post 9 provided on the upper part of the base plate 5 and a rear cover 6 provided on the upper part of the support post 9. A drive circuit board 12 is disposed on the surface of an isolation plate 11. A circuit board mounting post 10 is disposed between the drive circuit board 12 and the isolation plate 11. A housing 2 is disposed on the surface of the side plate 3, the front panel 1, and the rear cover 6, and the housing 2 is fixedly connected to the side plate 3 by bolts. A side plate 3 is disposed on the upper part of the base plate 5 and is welded and fixed to the floor. A front panel 1 and a rear cover 6 are respectively disposed at both ends of the base plate 5 and the side plate 3. A power interface 16, a control switch 17, a four-wire connection terminal 20, a power output interface 21, and a USB interface 22 are disposed on the surface of the front panel 1. An isolation mounting post 7 is disposed on the surface of the base plate 5, and two sets of isolation ADC modules 8 are disposed between the isolation mounting posts 7. The system includes a sensor interface unit 13, a main controller 14, and a PID control unit 15. A support column 9 is located on the upper part of the base plate 5, and an isolation plate 11 is located on top of the support column 9. A drive circuit board 12 is mounted on the surface of the isolation plate 11, and a circuit board mounting post 10 is located between the drive circuit board 12 and the isolation plate 11. A housing 2 is mounted on the surfaces of the side plate 3, front panel 1, and rear cover 6, and the housing 2 is fixedly connected to the side plate 3 by bolts. Each channel has an independent PID control and power output module, including a PID control unit 15, an anti-integral saturation mechanism unit, and a power drive circuit. Signal isolation devices are provided at the sensor input side, ADC front end, power output side, and communication interface to provide independent isolated power supplies for different functional areas. The system includes an isolated DC-DC module and a multi-layer PCB layout that physically isolates the analog, digital, power, and communication areas. The integrated control and communication chassis houses the main controller unit 14, sensor interface module, ADC module, PID control module, power output module, and isolation circuit. When using a resistive sensor, the four-wire connection terminal 20 connects two power output interfaces 21 to a constant current source as the excitation terminal, and the other two power output interfaces 21 are directly connected to the signal conditioning circuit input as the detection terminal. The PCB layout uses at least four layers, with physical partitions and isolation strips between the analog, digital, power, and communication areas. Critical analog signal lines use differential routing and are grounded. A shielding cover is installed in the ADC area.This high-precision temperature controller, compatible with multiple sensors, automatically adapts to various sensors such as PT100, thermocouples, and diodes through a programmable constant current source matrix and relay switching array hardware structure. This eliminates the need for manual hardware switching or complex calibration, greatly improving experimental convenience. Four-wire measurement completely eliminates lead resistance errors, and a strict isolation design minimizes interference. Multiple isolation protection designs enhance the system's anti-interference capability and safety, preventing crosstalk between channels. The integrated control structure is compact and highly integrated. It provides abundant local / remote communication interfaces for easy integration into automated testing systems.

[0021] Further improvements, such as Figure 1 As shown: The front panel 1 is provided with an isolation net 18 and a cooling fan 19 is provided inside the isolation net 18. By setting the isolation net 18, it can effectively prevent external objects from entering the temperature controller and protect the internal components from damage. It can also ensure that the cooling fan 19 works normally, dissipates internal heat in time, prevents the equipment from overheating, and improves the stability and service life of the equipment.

[0022] Further improvements, such as Figure 1 As shown: The side plate 3 has several sets of evenly distributed heat dissipation holes 4 inside. The design of the heat dissipation holes 4 increases the heat dissipation area of ​​the equipment, helps air circulation, further improves the heat dissipation efficiency of the equipment, ensures that the equipment maintains a suitable working temperature during long-term operation, and reduces performance degradation or failure caused by overheating.

[0023] Further improvements, such as Figure 1 As shown: The drive circuit board 12 adopts a layout of at least four layers. The drive circuit board 12 is strictly divided into analog area, digital area, power area and communication area, and physical partition slots and isolation strips are set between each partition. The multi-layer board layout and the design of physical partition slots and isolation strips effectively reduce electromagnetic interference between different functional areas, improve the purity of signals and the anti-interference ability of the equipment, and ensure the accuracy of measurement and control.

[0024] Further improvements, such as Figure 1 As shown: The two sets of isolated ADC modules 8 are stacked vertically and equipped with an isolation cover with ventilation holes. The stacking arrangement saves space, while the isolation cover with ventilation holes ensures electrical isolation between the ADC modules and allows air circulation, which helps heat dissipation and improves the integration and stability of the equipment.

[0025] Further improvements, such as Figure 1As shown, the power output interface 21 has four ports. Two of these ports are connected to the constant current source output as excitation terminals, while the other two are directly connected to the signal conditioning circuit input as detection terminals. This configuration eliminates the influence of wire resistance on the measurement results, improving measurement accuracy. Furthermore, the independent excitation and detection terminals simplify wiring and enhance experimental convenience.

[0026] Working Principle: Various sensors, such as PT100, thermocouples, and diodes, are connected to the sensor interface unit 13 of the temperature controller. Through a hardware structure design of a programmable constant current source matrix and relay switching array, the temperature controller can automatically identify the type of sensor connected without manual hardware switching or complex calibration. For signal acquisition and processing, the temperature signal acquired by the sensor is transmitted to the isolated ADC module 8 for analog-to-digital conversion via a four-wire connection terminal 20. The four-wire measurement eliminates wire resistance errors and improves signal acquisition accuracy. The design of the isolated ADC module 8 minimizes interference, ensuring signal purity and improving measurement accuracy and stability, providing reliable data support for subsequent control. The main controller 14 compares the acquired temperature signal with the set value and calculates the control quantity through the PID control unit 15, driving the power output module to adjust the power of the heating or cooling elements. Each channel includes an independent PID control unit 15, an anti-integral saturation mechanism unit, and a power drive circuit, achieving precise temperature control. Meanwhile, the independent design between channels and the multiple isolation protection design prevent crosstalk between channels, improving the system's anti-interference capability and safety. This ensures the stability and accuracy of the temperature controller when multiple channels are working simultaneously, meeting the stringent temperature control requirements of precision scientific experiments. During operation, the cooling fan 19 and the heat dissipation holes 4 work together to promptly dissipate internal heat. Simultaneously, the isolation design and protection circuit prevent external electromagnetic interference and poor grounding from affecting signal acquisition accuracy. Effective heat dissipation design and isolation protection ensure the stability and reliability of the temperature controller during long-term operation, extending the equipment's lifespan, reducing maintenance costs, and improving experimental efficiency. The temperature controller provides abundant local / remote communication interfaces, facilitating integration into automated testing systems. Users can exchange data and control the temperature controller via USB interface 22 or other communication interfaces, enabling remote monitoring and automated control, improving the intelligence level of experiments, facilitating user management and use of the temperature controller, and enhancing experimental efficiency and quality.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0029] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision temperature controller compatible with multiple sensors, characterized in that: include: A base plate (5) is provided with a side plate (3) on its upper part, and the side plate (3) is welded and fixed to the floor. A front panel (1) and a rear cover (6) are respectively provided at both ends of the base plate (5) and the side plate (3). The surface of the front panel (1) is provided with a power interface (16), a control switch (17), a four-wire connection terminal (20), a power output interface (21), and a USB interface (22). The surface of the base plate (5) is provided with isolation mounting posts (7), and two sets of isolation ADC modules (8) are provided between the isolation mounting posts (7). The surface of the base plate (5) is provided with a sensor interface unit (13), a main controller (14) and a PID control unit (15). The upper part of the base plate (5) is provided with a support column (9) and the upper part of the support column (9) is provided with an isolation plate (11). A drive circuit board (12) is provided on the surface of the isolation plate (11). A circuit board mounting column (10) is provided between the drive circuit board (12) and the isolation plate (11). The surfaces of the side plate (3), the front panel (1) and the rear cover (6) are provided with an outer shell (2) and the outer shell (2) is fixedly connected to the side plate (3) by bolts.

2. The high-precision temperature controller compatible with multiple sensors according to claim 1, characterized in that: The front panel (1) is provided with an isolation mesh (18) on its surface and a cooling fan (19) is provided inside the isolation mesh (18).

3. The high-precision temperature controller compatible with multiple sensors according to claim 1, characterized in that: The side plate (3) has several sets of evenly distributed heat dissipation holes (4) inside.

4. A high-precision temperature controller compatible with multiple sensors according to claim 1, characterized in that: The drive circuit board (12) is laid out with at least four layers. The drive circuit board (12) is strictly divided into analog area, digital area, power area and communication area, and physical partition slots and isolation strips are set between each partition.

5. A high-precision temperature controller compatible with multiple sensors according to claim 1, characterized in that: The two sets of isolated ADC modules (8) are stacked one on top of the other and equipped with an isolation cover with vents.

6. A high-precision temperature controller compatible with multiple sensors according to claim 1, characterized in that: The power output interface (21) is provided in four parts. Two of the power output interfaces (21) are connected to the constant current source output as the excitation end, and the other two power output interfaces (21) are directly connected to the signal conditioning circuit input as the detection end.

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