A cable temperature detection system

Abstract

The present application discloses a cable temperature detection system, which relates to the technical field of cable temperature detection, and includes a controller and a temperature measuring unit. The temperature measuring unit includes several temperature sensors. The detection circuit of the temperature sensor detects the temperature data of the high-voltage cable by heat conduction. The signal end of the temperature sensor is electrically connected to a fuse FU and an operational amplifier, and the output end of the operational amplifier is connected to the controller. The controller is electrically connected to a BAT tube for electrostatic protection. The technical advantages of the present application are: a direct-contact temperature sensor is used to capture the actual temperature of the cable, and the fuse FU and the operational amplifier are integrated in the temperature measuring unit. When facing a high-voltage fault in the system, especially when the fuse FU fails to blow immediately due to a delay problem, the operational amplifier intervenes as a second line of defense and protects the controller operating with weak current. In the face of sudden faults, the controller can also be protected in a timely and effective manner, avoiding damage caused by overcurrent and overheating.

Description

Technical Field

[0001] The present application relates to the technical field of cable temperature detection, and in particular to a cable temperature detection system. Background Art

[0002] In the context of the rapid development of the cold chain logistics industry, refrigerated containers, as the core carrier to ensure the quality and safety of temperature-sensitive goods, have become the focus of industry attention for their performance and reliability. In the traditional refrigerated container technology system, maintaining a constant and suitable temperature environment inside the container is the key to ensuring the freshness and effectiveness of the goods. This requires that the built-in refrigeration system of the container must operate continuously and stably, and the normal operation of the refrigeration system is highly dependent on a stable and reliable power supply. During long-distance transportation or mid-way stops, the traditional practice is to power the refrigerated container by connecting to an external power source (such as a terminal, warehouse, or mobile power generator) to maintain the continuous operation of the refrigeration system. In this process, the safety and stability of the power supply line are crucial, because any power failure or overheating of the line may cause the refrigeration system to fail, thereby threatening the safety and quality of the goods in the box.

[0003] In the actual application of cold chain logistics, although the temperature detection mechanism of the existing refrigerated container power supply line has guaranteed the power supply safety to a certain extent, there are still potential risks. When the power supply line fails due to aging, damage or improper operation, strong electricity may directly penetrate into the controller that originally runs on weak electricity through the temperature sensor, which is a weak link, without proper isolation and protection. This unexpected electrical connection will instantly generate huge current and heat, directly causing the controller to burn out, not only causing expensive equipment losses, but also may damage the goods in the box due to the interruption of the refrigeration system, causing immeasurable economic losses and damage to reputation; in addition, the cable temperature data must also have information remote transmission function and signal transmission self-checking ability, which can transmit key parameters such as temperature and humidity in the box to the remote monitoring center in real time and accurately, so that managers can grasp the status of goods in time and make corresponding adjustments to ensure the integrity and reliability of data transmission. Summary of the invention

[0004] This device provides a cable temperature detection system, and the specific implementation is as follows:

[0005] A cable temperature detection system, comprising:

[0006] A controller and a temperature measuring unit, wherein the temperature measuring unit includes a plurality of temperature sensors, the detection circuit of the temperature sensor detects the temperature data of the high-voltage cable by heat conduction, the signal end of the temperature sensor is electrically connected to a fuse FU and an operational amplifier, and the output end of the operational amplifier is connected to the controller, and the controller is electrically connected to a BAT tube for electrostatic protection, and the isolation protection between the weak-current operation controller and the high-voltage operation cable in a fault state is realized by the fuse FU and the operational amplifier;

[0007] The data transceiver unit for remote transmission of temperature data includes a gas discharge tube GDT1 and an isolation transceiver U1 connected to the signal receiving and transmitting ends of the controller. The 6th and 7th pins of the isolation transceiver U1 are respectively connected in series with self-recovery fuses to derive RINOUT signals and TOUTOUT signals, and the RINOUT signal and TOUTOUT signal are also respectively connected to the 1st and 2nd pins of the gas discharge tube GDT1. The 3rd pin of the gas discharge tube GDT1 is connected to the 8th pin of the isolation transceiver U1 after filtering.

[0008] Based on the above technical solution, the cable temperature is detected by direct contact of the temperature sensor, and a fuse FU and an operational amplifier are installed in the temperature measurement unit. When a fault occurs, within the range where the fuse FU fails to respond in time, the operational amplifier can protect the controller running with weak current, thereby effectively avoiding damage to the controller. The remote transmission of temperature data is realized through the data transceiver unit.

[0009] Preferably, it also includes an optocoupler detection unit, which includes an isolation optocoupler U2, and the control end of the isolation optocoupler U2 is connected to the RXIN1 signal generated by pin 6 of the isolation transceiver U1 through a resistor R8; the optocoupler detection unit also includes a resistor R5 arranged in parallel and a resistor R3 and a light-emitting diode D2 connected in series, one end of both is connected to VCC, and the other end outputs a test signal to pin 70 of the controller through a resistor R7.

[0010] Based on the above technical solution, the remote transmission of temperature data is realized through the data transceiver unit, and the execution status after the signal is sent is detected by the optocoupler detection unit, which can accurately judge whether the subsequent response is executed or whether the detection device is damaged; when the data transceiver unit sends out temperature data or control signals, the optocoupler detection unit will monitor the feedback information from the remote control center. If the subsequent response is executed normally (such as the controller performs corresponding processing after receiving the signal), the optocoupler detection unit will output a light; if the subsequent response is not executed or the detection device is damaged (such as the controller does not respond, the line is interrupted, etc.), the optocoupler detection unit will not light up.

[0011] Preferably, it also includes a temperature sensor for detecting the ambient temperature, in which the 2nd pin of the plug-in terminal P10 in the detection circuit is connected to GND, the 1st pin is connected to the controller through the resistor R136, and the right end of the resistor R136 is connected to GND through the capacitor C115, and the 3.3V reference voltage REF is connected to the 1st pin of the plug-in terminal P10 through the resistor R131 and the left end of the resistor R136.

[0012] Preferably, pin 1 of the BAT tube is connected to GND, pin 2 thereof is connected to a 3.3V reference voltage REF, and pin 3 thereof is connected to a controller.

[0013] Based on the above technical solution, the temperature sensor for detecting the ambient temperature is used to collect the surrounding ambient temperature, and the controller is connected to the remote control center for communication. The remote control center detects and regulates the execution status, and the controller can be externally connected to a fan-type heat dissipation structure to regulate the excessively high cable temperature through the heat dissipation structure.

[0014] Preferably, pins 3 and 4 of the isolation transceiver U1 connect the RX signal and the TX signal to pins 60 and 77 of the controller respectively, and pins 1 and 2 of the isolation transceiver U1 are connected to VCC and GND respectively, with a capacitor C1 connected between the two.

[0015] Preferably, TVS tubes are connected between pins 6 and 7, between pins 6 and 8, and between pins 7 and 8 of the isolation transceiver U1.

[0016] Preferably, a resistor R2 is connected between pin 8 of the isolation transceiver U1 and pin 3 of the gas discharge tube GDT1, and the resistor R2 is connected in parallel with the capacitor C2.

[0017] Based on the above technical solution, the resistor R2 and the capacitor C2 are connected in parallel to realize the filtering function. The gas discharge tube GDT is a single-gap or multi-gap switch type protection device that is sealed at high temperature by filling a certain proportion of inert gas (such as neon or argon) or other mixed gas as a discharge medium in the space between the metal electrode and the metallized ceramic. Its working principle is based on gas gap discharge. When a certain voltage is applied between the two poles of the discharge tube, an uneven electric field is generated between the poles. Under the action of the electric field, the gas begins to ionize; when the external voltage reaches the inter-pole field strength exceeding the insulation strength of the inert gas, the gap between the two electrodes breaks down to generate an arc, the gas is ionized, and a "negative resistance characteristic" is generated, thereby changing from an insulating state to a conductive state; at this time, the voltage at both ends of the gas discharge tube drops rapidly, the discharge current begins to rise, and the two electrodes are turned on; after conduction, the voltage between the two poles of the gas discharge tube is maintained at the residual voltage level determined by the discharge arc, and the residual voltage is usually very low, so that the electronic equipment connected in parallel with the discharge tube is protected from overvoltage damage.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] 1. The present invention uses a direct contact temperature sensor to capture the actual temperature of the cable to ensure the real-time and accuracy of the data. In order to further enhance the safety and reliability of the system, we integrate the fuse FU and the operational amplifier in the temperature measurement unit. When facing a strong current fault in the system, especially when the fuse FU fails to blow immediately due to a delay problem, the operational amplifier intervenes as the second line of defense and implements protective operations on the controller running with weak current. Even in the face of sudden faults or abnormal conditions, the controller can be protected in a timely and effective manner, avoiding damage caused by overcurrent, overheating, etc., thereby ensuring the stable operation of the entire system and the security of data;

[0020] 2. The data transceiver unit in the present invention is used to connect the on-site temperature detection structure and the remote monitoring center, convert the temperature data collected by the temperature sensor into a format suitable for long-distance transmission, and send it to the remote monitoring center via wired or wireless means. The monitoring personnel can obtain the temperature information of the cable in real time and remotely monitor and manage the operating status of the cable. At the same time, the optical coupling detection unit is used to detect the execution status after the signal is sent, that is, to determine whether the subsequent response is executed or whether the detection device is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a circuit schematic diagram of the main controller in the present invention;

[0022] Figure 2 The circuit principle of the temperature measuring unit in the present invention is Figure 1 ;

[0023] Figure 3 The circuit principle of the temperature measuring unit in the present invention is Figure 2 ;

[0024] Figure 4 The circuit principle of the signal optocoupler detection unit in the present invention is Figure 1 ;

[0025] Figure 5 The circuit principle of the signal optocoupler detection unit in the present invention is Figure 2 ;

[0026] Figure 6 It is a structural schematic diagram of the heat dissipation unit in the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the mounting seat and the driving assembly in the present invention;

[0028] Figure 8 This is a schematic diagram of the exploded structure of the heat dissipation unit in the present invention. Figure 1 ;

[0029] Fig. 9 This is a schematic diagram of the exploded structure of the heat dissipation unit in the present invention. Figure 2 ;

[0030] Fig.10 The present invention Figure 7 Section of the structure Figure 1 ;

[0031] Fig.11 The present invention Figure 7 Section of the structure Figure 2 ;

[0032] Fig.12 It is a cross-sectional view of the clamping assembly structure in the present invention.

[0033] Description of reference numerals:

[0034] 2. Card assembly, 3. Drive assembly, 4. Fan blades, 5. Clamping assembly, 6. Mounting seat,

[0035] 11. Plug, 12. Socket, 14. Temperature sensor, 15. Cable,

[0036] 101, positioning plate, 102, annular body, 103, partition, 104, limit conduction groove, 105, heat dissipation hole, 106, installation groove,

[0037] 201, telescopic rod, 202, L-shaped clamping rod, 203, spring, 204, conical limit head,

[0038] 301, motor, 302, gear ring,

[0039] 501, crimping head, 502, T-shaped slider,

[0040] 121. a fastening bolt groove, 122. an annular protrusion. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0043] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0044] The following is combined with Figure 1-12 This application is described in further detail.

[0045] An embodiment of the present application discloses a cable temperature detection system.

[0046] Example 1: Reference Figures 1 to 3 The present embodiment discloses a cable temperature detection system, including a controller and a temperature measuring unit, the temperature measuring unit including three temperature sensors respectively connected to three power supply cables, the detection circuit of the temperature sensor detects the temperature data of the high-voltage cable by heat conduction, the signal end of the temperature sensor is electrically connected to a fuse FU and an operational amplifier, and the output end of the operational amplifier connects the temperature A signal, the temperature B signal and the temperature C signal to the 21st, 22nd and 23rd pins of the controller respectively, the controller is electrically connected to a BAT tube for electrostatic protection, and the isolation protection between the weak-current operation controller and the strong-current operation cable in a fault state is realized by the fuse FU and the operational amplifier. In the present structure, P10, P11, P12 and P13 are XHB connectors with a model of 2.54-2A, the 1st pin of the BAT tube is connected to GND, the 2nd pin thereof is connected to the 3.3V reference voltage REF, and the 3rd pin thereof is connected to the controller.

[0047] It also includes a temperature sensor for detecting the ambient temperature. In its detection circuit, the 2nd pin of the plug-in terminal P10 is connected to GND, and its 1st pin connects the ambient temperature signal to the 20th pin of the controller through a resistor R136, and the right end of the resistor R136 is connected to GND through a capacitor C115, and the 3.3V reference voltage REF is connected to the 1st pin of the plug-in terminal P10 through a resistor R131 and the left end of the resistor R136. In this structure, R94 is 10K-5%, and the power supply plug-in terminal of the temperature sensor is selected from XHB2.54-2A, and the fuse FU1 and the fuse FU2 and fuse FU3 both use FU50ma / 250 leads, TVS tube 13, TVS tube 14 and TVS tube 15 all use SMBJ3.3CA, operational amplifier U26, operational amplifier U27 and operational amplifier U28 all use TP5591-RS, resistor R132, resistor R133, resistor R134 and resistor R131 are all 10K-1%, resistor R135, resistor R136, resistor R137 and resistor R138 are 50R-5%, BAT tube 1 model is BAT54S, capacitor C114, capacitor C115, capacitor C116, capacitor C117, capacitor C118, capacitor C119 and capacitor C120 are all 10nF(103)-10% 16V.

[0048] Example 2: Reference Figure 1 , Figure 4 and Figure 5Based on the above embodiments, the present embodiment further discloses a cable temperature detection system, further comprising an optocoupler detection unit and a data transceiver unit for remotely transmitting temperature data, the data transceiver unit comprising a gas discharge tube GDT1 and an isolation transceiver U1 connected to the signal receiving and transmitting ends of the controller, the 6th and 7th pins of the isolation transceiver U1 are respectively connected in series with a self-recovery fuse to derive a RINOUT signal and a TOUTOUT signal, and the RINOUT signal and the TOUTOUT signal are also respectively connected to the 1st and 2nd pins of the gas discharge tube GDT1, the 3rd pin of the gas discharge tube GDT1 is filtered and connected to the 8th pin of the isolation transceiver U1, in the present structure, a resistor R2 is connected between the 8th pin of the isolation transceiver U1 and the 3rd pin of the gas discharge tube GDT1, and the resistor R2 is connected in parallel with the capacitor C2.

[0049] The optocoupler detection unit includes an isolation optocoupler U2, and the control end of the isolation optocoupler U2 is connected to the RXIN1 signal generated by pin 6 of the isolation transceiver U1 through a resistor R8. In this structure, the optocoupler detection unit also includes a resistor R5 arranged in parallel and a resistor R3 and a light-emitting diode D2 connected in series. One end of the two is connected to VCC, and the other end outputs a test signal to pin 70 of the controller through a resistor R7.

[0050] Pin 3 and pin 4 of the isolation transceiver U1 connect the RX signal and TX signal of the serial communication 2 to pin 60 and pin 77 of the controller respectively. Pin 1 and pin 2 of the isolation transceiver U1 are connected to VCC and GND respectively, and a capacitor C1 is connected between the two. TVS tubes are connected between pin 6 and pin 7, between pin 6 and pin 8, and between pin 7 and pin 8 of the isolation transceiver U1. In this structure, TVS tube 1 is SMBJ30CA, and TVS tube 2 and TVS tube 3 are SMBJ18CA. Resistor R8 is 4.7K-5%, resistor R3 is 1K--5%, resistor R5 is 10K--5%, resistor R7 is 1K--5%, capacitor C1 is 100nF (I04) ±10% 16V, resettable fuse F1 and resettable fuse F2 are ASMD1206-010, capacitor C2 is B3D090L100nF (I04) ±10% 16V, isolation transceiver U1 is RSM232-ZLG, resistor R2 is 1M / 1206.

[0051] The specific implementation process is: the temperature data is sent to the isolated transceiver U1 and then transmitted to the remote control center. The remote control center transmits back the RXIN1 signal, which is transmitted to the isolated optocoupler U2. After the isolated optocoupler U2 responds, the light-emitting diode D2 is turned on and lights up, and VCC transmits the esting signal to the controller for judgment.

[0052] Example 3: Reference Figures 6 to 12Based on the above embodiments, this embodiment further discloses a cable temperature detection system, which also includes a heat dissipation structure and a mounting base 6 for mounting the heat dissipation structure and the temperature sensor 14. The mounting base 6 is arranged at the end of the socket 12. After the plug 11 is inserted into the socket 12, the cable 15 supplies power to the plug 11 through the socket 12. In this structure, the end of the socket 12 is used to fix the temperature sensor 14 in the fastening bolt groove 121 of the cable 15 insertion section. The temperature sensor 14 can be installed in a patch manner or in other conventional installation methods.

[0053] The mounting seat 6 includes an axially conductive annular body 102, a positioning plate 101 is installed at the end of the annular body 102, a partition 103 is provided in the annular body 102 to divide the front and rear ends into two parts, and a groove for gas circulation is opened on the partition 103. In this structure, a clamping assembly 5 is provided at the front end of the annular body 102, and a fan blade 4 is rotatably installed on the positioning plate 101 at the rear end, and a driving assembly 3 is provided on the back of the positioning plate 101, which includes a motor 301 and a gear ring 302 meshed with the output end of the motor 301, the gear ring 302 and the annular fan blade 4 are integrated, and a heat dissipation hole 105 is opened laterally at the rear end of the annular body 102, and the fan blade 4 rotates to discharge the heat from the socket 12 and the cable 15.

[0054] A limited conducting groove 104 is opened on the partition 103, and the clamping assembly 5 includes a crimping head 501 and a T-shaped slider 502 which are integrated into one body. The T-shaped slider 502 is slidably connected to the limited conducting groove 104, and an elastic reset member, such as a spring or a strain gauge, is provided between the two. In this structure, each clamping assembly 5 corresponds to a temperature sensor 14 in each fastening bolt groove 121 one by one, and the crimping head 501 is used to compress the temperature sensor 14 at the top of the fastening bolt groove 121.

[0055] Example 4: Reference Figures 6 to 12 Based on the above embodiments, the present embodiment further discloses a cable temperature detection system, further comprising a clamping assembly 2 arranged at the front end of the mounting seat 6 and acting on the annular protrusion 122 on the socket 12, a plurality of mounting grooves 106 are provided on the outer circumferential surface of the annular body 102, a telescopic rod 201 is provided in the mounting groove 106, a conical limit head 204 made of rubber is connected to the end of the telescopic rod 201, and a spring 203 for resetting is provided outside the telescopic rod 201, between the conical limit head 204 and the bottom of the groove, an L-shaped clamping rod 202 is also hinged above the mounting groove 106, a torsion spring can be added at the hinge, the bottom angle of the L-shaped clamping rod 202 can act on the back vertical section of the conical limit head 204, and the front oblique section of the conical limit head 204 faces the annular protrusion 122.

[0056] The specific implementation process is that during installation, the annular body 102 is pushed into the socket 12; at this time, the inclined end of the conical limit head 204 acts on the annular protrusion 122 to deform, and then passes over the annular protrusion 122 to clamp the annular protrusion 122 on the socket 12; at this time, the vertical surface of the conical limit head 204 is blocked by the falling L-shaped clamping rod 202 and cannot retreat; when disassembling, open the L-shaped clamping rod 202, and the conical limit head 204 returns to its position under the action of the spring 203.

[0057] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A cable temperature detection system, characterized in that: include: A controller and a temperature measuring unit, wherein the temperature measuring unit includes a temperature sensor, a detection circuit of the temperature sensor detects the temperature data of the high-voltage cable by heat conduction, a fuse FU and an operational amplifier are electrically connected to the signal end of the temperature sensor, and an output end of the operational amplifier is connected to the controller, and a BAT tube for electrostatic protection is electrically connected to the controller, and the isolation protection between the weak-voltage operation controller and the high-voltage operation cable in a fault state is realized by the fuse FU and the operational amplifier; The data transceiver unit for remote transmission of temperature data includes a gas discharge tube GDT1 and an isolation transceiver U1 connected to the signal receiving and transmitting ends of the controller. The 6th and 7th pins of the isolation transceiver U1 are respectively connected in series with self-recovery fuses to derive RINOUT signals and TOUTOUT signals, and the RINOUT signals and TOUTOUT signals are also respectively connected to the 1st and 2nd pins of the gas discharge tube GDT1. The 3rd pin of the gas discharge tube GDT1 is connected to the 8th pin of the isolation transceiver U1 after filtering. It also includes an optocoupler detection unit, which includes an isolation optocoupler U2, and the control end of the isolation optocoupler U2 is connected to the RXIN1 signal generated by the 6th pin of the isolation transceiver U1 through a resistor R8; The optocoupler detection unit also includes a resistor R5 arranged in parallel and a resistor R3 and a light emitting diode D2 connected in series. One end of both is connected to VCC, and the other end outputs a test signal to the 70th pin of the controller through the resistor R7.

2. A cable temperature detection system according to claim 1, characterized in that: It also includes a temperature sensor for detecting the ambient temperature. In its detection circuit, pin 2 of the plug-in terminal P10 is connected to GND, and pin 1 is connected to the controller through a resistor R136. The right end of the resistor R136 is connected to GND through a capacitor C115, and the 3.3V reference voltage REF is connected to pin 1 of the plug-in terminal P10 through a resistor R131 and the left end of the resistor R136.

3. A cable temperature detection system according to claim 2, characterized in that: Pin 1 of the BAT tube is connected to GND, pin 2 is connected to the 3.3V reference voltage REF, and pin 3 is connected to the controller.

4. A cable temperature detection system according to claim 1, characterized in that: Pins 3 and 4 of the isolation transceiver U1 connect the RX signal and the TX signal to pins 60 and 77 of the controller respectively, and pins 1 and 2 of the isolation transceiver U1 are connected to VCC and GND respectively, and a capacitor C1 is connected between the two.

5. A cable temperature detection system according to claim 4, characterized in that: TVS tubes are connected between pins 6 and 7, between pins 6 and 8, and between pins 7 and 8 of the isolation transceiver U1.

6. A cable temperature detection system according to claim 5, characterized in that: A resistor R2 is connected between the 8th pin of the isolation transceiver U1 and the 3rd pin of the gas discharge tube GDT1, and the resistor R2 is connected in parallel with the capacitor C2.

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