Contactor parallel temperature monitoring circuit, monitoring system and electronic device

Abstract

The application discloses a contactor parallel temperature monitoring circuit, a monitoring system and electronic equipment, comprising: a temperature measurement module, a temperature monitoring module and at least two parallelly connected contactors, the output end of the temperature measurement module is connected with the input end of the temperature monitoring module; the temperature measurement module is used for measuring a temperature signal corresponding to the current temperature of the contact of the contactor in real time; and the temperature monitoring module is used for outputting an alarm signal in the case that the amplitude of the temperature signal exceeds a preset amplitude. The temperature of the contact of the contactor is detected in real time, the alarm signal is outputted when an abnormal condition occurs, the user is reminded to check and replace the contactor, system abnormality or stop working caused by the failure of the contactor is avoided, and the safety and reliability of the whole system are improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment protection technology, and in particular to a contactor parallel temperature monitoring circuit, a monitoring system, and an electronic device. Background Technology

[0002] Currently, in high-current applications such as electric vehicle charging stations, energy storage systems, and large industrial equipment, multiple contactors are typically connected in parallel to increase the system's current carrying capacity. For example, theoretically, connecting two contactors with a rated current of 400A in parallel can increase the total current to 800A. However, in actual operation, due to factors such as manufacturing tolerances, contact material wear, inconsistent oxidation levels, and differences in installation processes, the resistance of the contactors connected in parallel is difficult to maintain, resulting in uneven current distribution among the contactors.

[0003] Under continuous high current conditions, if the resistance of a contactor increases significantly due to an internal fault, the contact will overheat due to the increased current. Excessive temperature can easily lead to faults such as contact welding and coil failure, causing the entire system to stop working. This not only affects the normal operation of the equipment but also poses significant safety hazards. Utility Model Content

[0004] The main purpose of this application is to provide a contactor parallel temperature monitoring circuit, monitoring system and electronic device, which aims to solve the problems of system abnormalities and poor reliability caused by excessive temperature in existing contactor parallel schemes.

[0005] To achieve the above objectives, this application proposes a contactor parallel temperature monitoring circuit, the contactor parallel temperature monitoring circuit comprising: The system includes a temperature monitoring module, at least two contactors connected in parallel, and a temperature measurement module with the same number of contactors. Each temperature measurement module is disposed in the corresponding contactor, and the output terminal of the temperature measurement module is connected to the input terminal of the temperature monitoring module. The temperature measurement module is used to measure the temperature signal corresponding to the current temperature of the contactor's contacts in real time. The temperature monitoring module is used to output an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude.

[0006] In one embodiment, the temperature monitoring module includes: The system includes a signal processing unit and an alarm unit. The input terminal of the signal processing unit is connected to the output terminal of the temperature measurement module, and the output terminal of the signal processing unit is connected to the input terminal of the alarm unit.

[0007] In one embodiment, the signal processing unit includes: The system includes a signal conditioning component and a temperature calculation component. The input terminal of the signal conditioning component is connected to the output terminal of the temperature measurement module, the output terminal of the signal conditioning component is connected to the input terminal of the temperature calculation component, and the output terminal of the temperature calculation component is connected to the input terminal of the alarm unit. The signal conditioning component is used to condition the temperature signal to obtain a conditioned temperature signal; The temperature calculation component is used to output a temperature value upon receiving the conditioned temperature signal.

[0008] In one embodiment, the temperature measurement module includes: An NTC thermistor is installed at a preset position on the contactor to detect the temperature signal corresponding to the current temperature of the contactor's contacts in real time. The output terminal of the NTC thermistor is connected to the input terminal of the temperature monitoring module.

[0009] In one embodiment, the alarm unit includes: A temperature judgment component and an alarm indicator light are provided. The input terminal of the temperature judgment component is connected to the output terminal of the temperature calculation component, and the output terminal of the temperature judgment component is connected to the input terminal of the alarm indicator light. The temperature judgment component is used to output a judgment signal when the temperature value exceeds a preset amplitude. The alarm indicator light is used to flash and output an alarm signal when the judgment signal is received.

[0010] In one embodiment, each of the contactors is disposed on a connecting plate or a busbar.

[0011] In one embodiment, the connecting plate or busbar is a metal plate.

[0012] In one embodiment, a contactor parallel temperature monitoring system is provided, wherein the contactor parallel temperature monitoring system is provided with the above-mentioned contactor parallel temperature monitoring circuit.

[0013] In one embodiment, the contactor parallel temperature monitoring system further includes: The display module has its input terminal connected to the output terminal of the temperature monitoring module, and is used to display the current temperature of the contactor's contacts.

[0014] In one embodiment, an electronic device is provided, wherein the electronic device is provided with the above-described contactor parallel temperature monitoring system.

[0015] This application provides a contactor parallel temperature monitoring circuit, a monitoring system, and an electronic device. The contactor parallel temperature monitoring circuit includes a temperature measurement module and a temperature monitoring module. The temperature measurement module detects the contactor temperature in real time and outputs the detected temperature signal to the temperature monitoring module. The temperature monitoring module processes and judges the temperature signal, and outputs an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude. This contactor parallel temperature monitoring circuit of this application detects the temperature of the contactor contacts in real time. When an abnormality occurs, it outputs an alarm signal to remind the user to check and replace the contactor, avoiding system abnormalities or malfunctions caused by contactor failure, thus improving the safety and reliability of the entire system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a contactor parallel temperature monitoring circuit in one embodiment of the present invention; Figure 2 This is a schematic diagram of a contactor parallel temperature monitoring circuit in one embodiment of the present invention; Figure 3 This is a component connection diagram of the contactor parallel temperature monitoring circuit in one embodiment of the present invention; Figure 4 This is a circuit diagram of a contactor parallel temperature monitoring circuit in one embodiment of the present invention.

[0018] Explanation of icon numbers: 1. Temperature measurement module; 3. Temperature monitoring module; 31. Signal processing unit; 311. Signal conditioning component; 312. Temperature calculation component; 32. Alarm unit; 321. Temperature judgment component; 322. Alarm indicator light; 5. Contactor contacts; 7. Contactor.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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 scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] Currently, in existing technologies, multiple contactors are typically connected in parallel to increase the system's current carrying capacity in high-current applications such as electric vehicle charging stations, energy storage systems, and large industrial equipment. For example, theoretically, connecting two contactors with a rated current of 400A in parallel can increase the total current capacity to 800A. However, in actual operation, due to factors such as manufacturing tolerances, contact material wear, inconsistent oxidation levels, and differences in installation processes, the contact resistance of each parallel branch is difficult to keep consistent, resulting in uneven current distribution among the contactors.

[0024] Under continuous high current or abnormal operating conditions, if a contactor experiences a significant increase in contact resistance due to an internal fault, that branch will experience localized overheating due to excessive current sharing. Excessive temperature can easily lead to serious faults such as contact welding and coil failure, ultimately paralyzing the entire control system. This not only affects the normal operation of the equipment but also poses significant safety hazards. Currently, the industry lacks real-time, accurate temperature monitoring methods for the operating status of parallel contactors, making it impossible to provide early warning and intervention in the early stages of overheating, hindering the shift from "passive maintenance" to "active protection."

[0025] Therefore, there is an urgent need for a solution that can effectively detect the temperature status of parallel contactors and promptly issue an alarm when there is an abnormal temperature rise, so as to improve the reliability and safety of the system.

[0026] In one embodiment, the present invention proposes a contactor parallel temperature monitoring circuit, referring to... Figure 1 ,include: The temperature monitoring module 3, at least two contactors 7 connected in parallel, and a temperature measurement module 1 with the same number of contactors 7 are provided. Each temperature measurement module 1 is respectively installed in the corresponding contactor 7. The output terminal of the temperature measurement module 1 is connected to the input terminal of the temperature monitoring module 3. The temperature measurement module 1 is used to measure the temperature signal corresponding to the current temperature of the contactor 5 in real time. The temperature monitoring module 3 is used to output an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude.

[0027] It should be noted that the temperature measurement module 1 refers to the module that collects the current temperature of the contactor's contact 5 and converts it into an electrical signal to obtain a temperature signal. Its core function is to sense the temperature and complete the signal conversion and output. Temperature monitoring module 3 refers to the module that receives signals from temperature measurement module 1, processes, analyzes and judges the signals, and finally decides whether to output an alarm signal based on the judgment results. It is the decision center of the entire temperature monitoring circuit.

[0028] A contactor 7 refers to an electrical switching device that uses electromagnetic principles to control the on / off state of a circuit. It typically consists of a coil, an iron core, contacts, and an arc-extinguishing system. In this application, multiple contactors are connected in parallel to share the load current.

[0029] Additionally, it should be noted that the temperature signal corresponding to the current temperature refers to the electrical signal parameter that is measured, collected, and output in real time by the temperature measurement module 1, and can uniquely characterize the actual temperature of the contactor's contact 5 at a certain moment. The preset amplitude refers to the threshold parameter preset in the temperature monitoring module 3. This parameter corresponds to an allowed upper temperature limit and is used to compare and judge with the temperature signal corresponding to the current temperature. When the amplitude of the temperature signal corresponding to the current temperature exceeds this threshold, it is judged as abnormal. An alarm signal is a perceptible signal generated by the temperature monitoring module 3 when it determines that an abnormality has occurred, used to indicate a fault state.

[0030] The working process of the above-mentioned contactor parallel temperature monitoring circuit is as follows: Temperature measurement module 1 measures the temperature signal corresponding to the current temperature of each contactor 7 in real time, and then outputs it to temperature monitoring module 3 through the output terminal of temperature measurement module 1. Temperature monitoring module 3 receives the temperature signal output by temperature measurement module 1, compares the amplitude of the temperature signal with the preset amplitude, and does not output an alarm signal when the amplitude of the temperature signal does not exceed the preset amplitude. When the amplitude of the temperature signal exceeds the preset amplitude, an alarm signal is output; When the user senses the alarm signal, the contactor 7 should be inspected and replaced to prevent the system from stopping due to a malfunction of the contactor 7.

[0031] In this embodiment, a temperature measurement module and a temperature monitoring module are set in the contactor parallel temperature monitoring circuit. The temperature measurement module detects the contactor temperature in real time and outputs the detected temperature signal to the temperature monitoring module. The temperature monitoring module processes and judges the temperature signal, and outputs an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude. The contactor parallel temperature monitoring circuit of this application detects the temperature of the contactor contacts in real time. When an abnormality occurs, it outputs an alarm signal to remind the user to check and replace the contactor, avoiding system abnormalities or malfunctions caused by contactor failure, and improving the safety and reliability of the entire system.

[0032] In one embodiment, reference is made to Figure 2 The temperature monitoring module 3 includes: The signal processing unit 31 and the alarm unit 32 are provided. The input terminal of the signal processing unit 31 is connected to the output terminal of the temperature measurement module 1, and the output terminal of the signal processing unit 31 is connected to the input terminal of the alarm unit 32.

[0033] It should be noted that the signal processing unit 31 refers to the unit used to receive and process the temperature signal corresponding to the current temperature output from the temperature measurement module 1. The function of the signal processing unit 31 is to process the temperature signal, including but not limited to signal amplification, filtering, analog-to-digital conversion, etc.

[0034] Alarm unit 32 is a unit responsible for outputting an alarm signal when it receives an abnormal signal from signal processing unit 31. After receiving the abnormal signal, alarm unit 32 can convey it to the user in various ways.

[0035] The working process of the above-mentioned contactor parallel temperature monitoring circuit is as follows: The input terminal of the signal processing unit 31 receives the temperature signal output by the temperature measurement module 1, processes the temperature signal to obtain the processed temperature signal, and determines whether the amplitude of the temperature signal exceeds the preset amplitude. When the amplitude of the temperature signal does not exceed the preset amplitude, no abnormal signal is output. When the amplitude of the temperature signal exceeds the preset amplitude, an abnormal signal is output through the output terminal of the signal processing unit 31. When the input terminal of the alarm unit 32 receives an abnormal signal, it immediately outputs an alarm signal; When the user senses the alarm signal, the contactor 7 should be inspected and replaced to prevent the system from stopping due to a malfunction of the contactor 7.

[0036] In this embodiment, a signal processing unit and an alarm unit are set in the temperature monitoring module. The signal processing unit processes and judges the temperature signal output by the temperature measurement module. When the amplitude of the temperature signal exceeds a preset amplitude, an abnormality is determined and an abnormality signal is output. The alarm unit receives the abnormality signal and outputs an alarm signal. The contactor parallel temperature monitoring circuit of this application detects the temperature of the contactor contacts in real time. When an abnormality occurs, an alarm signal is output to remind the user to check and replace the contactor, avoiding system abnormalities or malfunctions caused by contactor failure, thus improving the safety and reliability of the entire system.

[0037] In one embodiment, reference is made to Figure 3 The signal processing unit 31 includes: The signal conditioning component 311 and the temperature calculation component 312 are provided. The input terminal of the signal conditioning component 311 is connected to the output terminal of the temperature measurement module 1, the output terminal of the signal conditioning component 311 is connected to the input terminal of the temperature calculation component 312, and the output terminal of the temperature calculation component 312 is connected to the input terminal of the alarm unit 32. The signal conditioning component 311 is used to condition the temperature signal to obtain a conditioned temperature signal. The temperature calculation component 312 is used to output a temperature value upon receiving the conditioned temperature signal.

[0038] It should be noted that the signal conditioning component 311 is a functional component that preprocesses the temperature signal output by the temperature measurement module 1. Its specific functions may include, but are not limited to, amplifying the temperature signal, filtering out noise or interference in the temperature signal, and improving the quality of the temperature signal.

[0039] Temperature calculation component 312 refers to the component that receives the conditioned temperature signal output by signal conditioning component 311 and converts it into an actual temperature value. For example, temperature calculation component 312 may specifically include an analog-to-digital converter and a microprocessor. The analog-to-digital converter converts the conditioned temperature signal into a digital signal, and then the microprocessor calculates and looks up the corresponding temperature value.

[0040] The working process of the above-mentioned contactor parallel temperature monitoring circuit is as follows: The input terminal of the signal conditioning component 311 receives the temperature signal output by the temperature measurement module 1, conditions the temperature signal, and then outputs the conditioned temperature signal through the input terminal of the signal conditioning component 311. The temperature calculation component 312 receives the conditioned temperature signal at its input terminal and obtains the temperature value corresponding to the temperature signal after processing such as conversion, calculation, and table lookup.

[0041] In this embodiment, a signal conditioning component and a temperature calculation component are set in the signal processing unit. The signal conditioning component conditions the temperature signal output by the temperature measurement module and then outputs the conditioned temperature signal to the temperature calculation component. The temperature calculation component processes and calculates the conditioned temperature signal to obtain the corresponding temperature value and outputs it to the alarm unit for judgment. The contactor parallel temperature monitoring circuit of this application detects the temperature of the contactor contacts in real time. When an abnormality occurs, it outputs an alarm signal to remind the user to check and replace the contactor, avoiding system abnormalities or shutdowns caused by contactor failure, thus improving the safety and reliability of the entire system.

[0042] In one embodiment, reference is made to Figure 4 Temperature measurement module 1 includes: An NTC thermistor R_NTC is installed at a preset position on the contactor to detect the temperature signal corresponding to the current temperature of the contactor's contact 5 in real time. The output terminal of the NTC thermistor R_NTC is connected to the input terminal of the temperature monitoring module 3.

[0043] It should be noted that an NTC thermistor R_NTC is an electronic component whose resistance decreases as temperature increases. The change in resistance of an NTC thermistor R_NTC with temperature is very significant; even a small temperature change can cause a significant change in resistance. Moreover, compared to a PTC thermistor, it has a very high negative temperature coefficient, is small in size, has low heat capacity, and can respond quickly to temperature changes.

[0044] It is understandable that the NTC thermistor R_NTC is placed around the contactor's contact 5, with a distance of 2-3mm between it and the contactor's contact 5.

[0045] In this embodiment, the temperature measurement module is set to an NTC thermistor, which can detect the temperature signal corresponding to the current temperature of the contactor contacts in real time and respond quickly, avoiding early warning delays caused by slow temperature measurement response. By placing the NTC thermistor above the contactor contacts, once a contactor contact starts to overheat abnormally for any reason, the system can immediately detect the local overheating, thereby issuing an alarm before the fault escalates (such as contact welding or coil failure), greatly improving the system's operational reliability and safety.

[0046] In one embodiment, see Figure 3 The alarm unit 32 includes: The temperature judgment component 321 and the alarm indicator light 322 are provided. The input terminal of the temperature judgment component 321 is connected to the output terminal of the temperature calculation component 312, and the output terminal of the temperature judgment component 321 is connected to the input terminal of the alarm indicator light 322. The temperature judgment component 321 is used to output a judgment signal when the temperature value exceeds a preset amplitude. The alarm indicator light 322 is used to flash and output an alarm signal when the judgment signal is received.

[0047] It should be noted that the temperature judgment component 321 is a component that performs logical judgment. It receives the temperature value output from the temperature calculation component, compares the temperature value with a preset amplitude, and uses it to determine whether the contact temperature state of the contactor under test is normal, and outputs a judgment signal.

[0048] Alarm indicator light 322 is a human-machine interface device that transmits alarm information to the user in the form of visible light, controlled by a judgment signal. When alarm indicator light 322 receives a judgment signal, the indicator light is driven and operates in a specific manner (flashing), thereby visually indicating which contactor has an abnormal temperature.

[0049] It should be noted that the judgment signal is an electrical signal output by the temperature judgment component 321 after completing the comparison to characterize the judgment result. When the temperature value does not exceed the preset amplitude, it indicates that there is no abnormality and no judgment signal is output. When the temperature value exceeds the preset amplitude, it indicates that the contactor of the corresponding contactor has an abnormality and a judgment signal is output to the alarm indicator 322.

[0050] In this embodiment, a temperature judgment component and an alarm indicator light are provided in the alarm unit. The temperature judgment component judges the temperature value output by the temperature calculation component. When the temperature value exceeds a preset amplitude, a judgment signal is output, causing the alarm indicator light to flash, reminding the user to check and replace the contactor. This avoids system abnormalities or malfunctions due to contactor failure, thus improving the safety and reliability of the entire system.

[0051] In one embodiment, each of the contactors is disposed on a connecting plate or a busbar.

[0052] A connecting plate or busbar refers to a structure used for electrical connection and mechanical fixation. Its core function is to provide a unified and stable mounting base for multiple independent contactors in terms of mechanical structure, ensuring the accuracy of the relative positions of each contactor; and through its excellent conductivity, it electrically connects the contacts of each contactor in parallel, forming a common current path, so that the total load current can be distributed to each contactor in a certain proportion. This structure is the basis for realizing contactor parallel connection and increasing the total current capacity of the system.

[0053] In this embodiment, the contactors are mounted on a connecting plate or busbar, effectively reducing the additional resistance differences caused by varying connection line lengths and contact points. This promotes balanced current distribution among parallel branches from a physical structure perspective, reducing the risk of uneven current caused by improper connections. Furthermore, it enhances mechanical strength and shock resistance, preventing increased contact resistance due to loose individual contactors.

[0054] In one embodiment, the connecting plate or busbar is a metal plate.

[0055] For example, the connecting plate or busbar is preferably made of copper or aluminum. Copper and aluminum have extremely high electrical conductivity, which minimizes the resistance of the busbar itself, thereby reducing conduction losses and voltage drops when current flows through. At the same time, these two metals also have excellent thermal conductivity, allowing the connecting plate or busbar to not only efficiently transmit current but also serve as an effective heat dissipation component, quickly conducting and dissipating the heat generated by the contactor contacts.

[0056] In this embodiment, the connecting plate or busbar is a metal plate, which controls the heat generation of the connecting plate or busbar itself at the source, avoiding it from becoming a new heat source due to excessive resistance in the connection channel. When the temperature of a contactor contact rises, some of the heat generated can be quickly absorbed and conducted by the connecting plate or busbar, utilizing its larger surface area for heat dissipation. This good thermal equilibrium effect helps prevent heat accumulation at fault points, providing another layer of protection for the stable operation of the system and further improving the safety and reliability of the entire system.

[0057] In one embodiment, a contactor parallel temperature monitoring system is provided, wherein the contactor parallel temperature monitoring system is provided with the above-mentioned contactor parallel temperature monitoring circuit.

[0058] In this embodiment, a contactor parallel temperature monitoring circuit is set up in the contactor parallel temperature monitoring system. A temperature measurement module detects the contactor temperature in real time and outputs the detected temperature signal to the temperature monitoring module. The temperature monitoring module processes and judges the temperature signal, and outputs an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude. This contactor parallel temperature monitoring circuit detects the temperature of the contactor contacts in real time. When an abnormality occurs, it outputs an alarm signal to remind the user to check and replace the contactor, avoiding system abnormalities or malfunctions caused by contactor failures, thus improving the safety and reliability of the entire system.

[0059] In one embodiment, the contactor parallel temperature monitoring system further includes: The display module has its input terminal connected to the output terminal of the temperature monitoring module, and is used to display the current temperature of the contactor's contacts. The core function of the display module is to receive data processed by the temperature monitoring module, specifically the current temperature values ​​of each contactor contact, and present this data to the user in a visual form (such as numbers, bar charts, or codes), making the internal status of the contactor parallel temperature monitoring system transparent.

[0060] In this embodiment, a display module is installed in the contactor parallel temperature monitoring system. This module displays the specific temperature values ​​of each parallel contactor in real time and intuitively, allowing operators to clearly understand the operating status of the entire system. This greatly enhances the transparency of the system status, facilitating refined management and trend observation. It provides data for predictive maintenance, allowing for planned intervention before faults occur, further improving the system's reliability and safety.

[0061] In one embodiment, an electronic device is provided, wherein the electronic device is provided with the above-described contactor parallel temperature monitoring system.

[0062] In this embodiment, a contactor parallel temperature monitoring system is installed in the electronic device. A temperature measurement module detects the contactor temperature in real time and outputs the detected temperature signal to the temperature monitoring module. The temperature monitoring module processes and judges the temperature signal, and outputs an alarm signal when the amplitude of the temperature signal exceeds a preset value. This contactor parallel temperature monitoring circuit detects the temperature of the contactor contacts in real time. When an abnormality occurs, it outputs an alarm signal to remind the user to check and replace the contactor, avoiding system abnormalities or malfunctions caused by contactor failure, thus improving the safety and reliability of the entire system.

[0063] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A contactor parallel temperature monitoring circuit, characterized in that, The contactor parallel temperature monitoring circuit includes: The system includes a temperature monitoring module, at least two contactors connected in parallel, and a temperature measurement module with the same number of contactors. Each temperature measurement module is disposed in the corresponding contactor, and the output terminal of the temperature measurement module is connected to the input terminal of the temperature monitoring module. The temperature measurement module is used to measure the temperature signal corresponding to the current temperature of the contactor's contacts in real time. The temperature monitoring module is used to output an alarm signal when the amplitude of the temperature signal exceeds a preset amplitude.

2. The contactor parallel temperature monitoring circuit as described in claim 1, characterized in that, The temperature monitoring module includes: The system includes a signal processing unit and an alarm unit. The input terminal of the signal processing unit is connected to the output terminal of the temperature measurement module, and the output terminal of the signal processing unit is connected to the input terminal of the alarm unit.

3. The contactor parallel temperature monitoring circuit as described in claim 2, characterized in that, The signal processing unit includes: The system includes a signal conditioning component and a temperature calculation component. The input of the signal conditioning component is connected to the output of the temperature measurement module, the output of the signal conditioning component is connected to the input of the temperature calculation component, and the output of the temperature calculation component is connected to the input of the alarm unit. The signal conditioning component is used to condition the temperature signal to obtain a conditioned temperature signal; The temperature calculation component is used to output a temperature value upon receiving the conditioned temperature signal.

4. The contactor parallel temperature monitoring circuit as described in claim 1, characterized in that, The temperature measurement module includes: An NTC thermistor is installed at a preset position on the contactor to detect the temperature signal corresponding to the current temperature of the contactor's contacts in real time. The output terminal of the NTC thermistor is connected to the input terminal of the temperature monitoring module.

5. The contactor parallel temperature monitoring circuit as described in claim 3, characterized in that, The alarm unit includes: A temperature judgment component and an alarm indicator light are provided. The input terminal of the temperature judgment component is connected to the output terminal of the temperature calculation component, and the output terminal of the temperature judgment component is connected to the input terminal of the alarm indicator light. The temperature judgment component is used to output a judgment signal when the temperature value exceeds a preset amplitude. The alarm indicator light is used to flash and output an alarm signal when the judgment signal is received.

6. The contactor parallel temperature monitoring circuit as described in claim 1, characterized in that, Each of the contactors is mounted on a connecting plate or a busbar.

7. The contactor parallel temperature monitoring circuit as described in claim 6, characterized in that, The connecting plate or busbar is a metal plate.

8. A contactor parallel temperature monitoring system, characterized in that, The contactor parallel temperature monitoring system is equipped with a contactor parallel temperature monitoring circuit as described in any one of claims 1 to 7.

9. The contactor parallel temperature monitoring system as described in claim 8, characterized in that, The contactor parallel temperature monitoring system also includes: The display module has its input terminal connected to the output terminal of the temperature monitoring module, and is used to display the current temperature of the contactor's contacts.

10. An electronic device, characterized in that, The electronic device is equipped with a contactor parallel temperature monitoring system as described in any one of claims 8 to 9.

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