Over-temperature protection device and system

Abstract

The utility model discloses an over-temperature protection device and system. The over-temperature protection device comprises a control module and a temperature detection module, the output end of the temperature detection module is electrically connected with the control module; the temperature detection module comprises a first preset number of temperature detection units; the temperature detection units are arranged at the same temperature detection point and are used for detecting the temperature of the same temperature detection point; the temperature detection units are electrically connected with the output end of the temperature detection module in series or in parallel; the first preset number of temperature detection units have a second preset number of types; wherein the first preset number and the second preset number are both larger than 1. The technical scheme provided by the embodiment of the utility model is beneficial to improving the reliability of realizing an over-temperature protection function on electrical equipment or parts.

Description

Technical Field

[0001] This utility model relates to the field of electronic protection technology, and in particular to an over-temperature protection device and system. Background Technology

[0002] During prolonged operation, electrical equipment will experience a temperature increase. Operating electrical equipment or components at higher temperatures can lead to damage or reduced lifespan. Therefore, to ensure the long-term stable operation of electrical equipment or components, over-temperature protection measures are typically implemented to monitor their temperature. However, current technology often uses only one temperature sensor at a single detection point. When the temperature sensor fails or wiring abnormalities occur, the electrical equipment or component loses its over-temperature protection function. Therefore, the reliability of existing over-temperature protection functions is relatively low, easily leading to damage or burnout of electrical equipment or components under over-temperature conditions. Utility Model Content

[0003] This invention provides an over-temperature protection device and system to solve the problem of low reliability in achieving over-temperature protection function with only one temperature sensor.

[0004] According to one aspect of the present invention, an over-temperature protection device is provided, comprising: a control module and a temperature detection module;

[0005] The output terminal of the temperature detection module is electrically connected to the control module.

[0006] The temperature detection module includes a first preset number of temperature detection units; each of the temperature detection units is set at the same temperature detection point and is used to detect the temperature at the same temperature detection point.

[0007] Each of the temperature detection units is electrically connected to the output terminal of the temperature detection module in series or in parallel.

[0008] The first preset number of temperature detection units has a second preset number of types; wherein, both the first preset number and the second preset number are greater than 1.

[0009] Optionally, the temperature detection module includes at least two temperature detection groups; each of the at least two temperature detection groups is electrically connected to the control module.

[0010] Each of the temperature detection groups includes at least one of the temperature detection units.

[0011] Optionally, each of the temperature detection groups includes one of the temperature detection units;

[0012] Alternatively, each of the temperature detection groups may include at least two of the temperature detection units;

[0013] Each of the temperature detection units has at least two types.

[0014] Optionally, the temperature detection units within each of the temperature detection groups are of the same type;

[0015] The temperature detection units in each of the temperature detection groups are of at least two types.

[0016] Optionally, the temperature detection module includes a first temperature detection group and a second temperature detection group, wherein the first temperature detection group and the second temperature detection group each include two temperature detection units;

[0017] The temperature detection unit in the first temperature detection group includes a negative temperature coefficient thermistor, and the temperature detection unit in the second temperature detection group includes a temperature switch;

[0018] In the first temperature detection group, each of the negative temperature coefficient thermistors is connected in parallel to the control module;

[0019] In the second temperature detection group, each of the temperature switches is connected in parallel to the control module; wherein, the temperature switch includes a normally open temperature switch.

[0020] Optionally, the temperature detection module includes a first temperature detection group and a second temperature detection group, wherein the first temperature detection group and the second temperature detection group each include two temperature detection units;

[0021] The temperature detection unit in the first temperature detection group includes a negative temperature coefficient thermistor, and the temperature detection unit in the second temperature detection group includes a temperature switch;

[0022] In the first temperature detection group, each of the negative temperature coefficient thermistors is connected in parallel to the control module;

[0023] In the second temperature detection group, each of the temperature switches is connected in series to the control module; wherein, the temperature switch includes a normally closed temperature switch.

[0024] Optionally, the temperature detection units in each of the temperature detection groups are of the same type;

[0025] Each of the temperature detection groups has at least two types of temperature detection units.

[0026] Optionally, the temperature detection module includes a first temperature detection group and a second temperature detection group, wherein the first temperature detection group and the second temperature detection group each include two temperature detection units;

[0027] The temperature detection unit in the first temperature detection group and the temperature detection unit in the second temperature detection group respectively include a negative temperature coefficient thermistor and a temperature switch;

[0028] In the first temperature detection group, the negative temperature coefficient thermistor is connected in series with the temperature switch in the control module; wherein, the temperature switch includes a normally closed temperature switch.

[0029] In the second temperature detection group, the negative temperature coefficient thermistor is connected in parallel with the temperature switch to the control module; wherein, the temperature switch includes a normally open temperature switch.

[0030] Optionally, the temperature detection unit includes at least two of the following: a temperature sensing chip, a thermistor, a thermocouple, and a temperature switch.

[0031] According to another aspect of the present invention, an over-temperature protection system is provided, including a component under test and an over-temperature protection device as described in any embodiment of the first aspect, wherein the over-temperature protection device is used to detect the temperature of the component under test and to activate over-temperature protection for the component under test when the temperature of the component under test is higher than a temperature threshold.

[0032] The over-temperature protection device provided in this embodiment includes a control module and a temperature detection module electrically connected to the control module. The temperature detection module includes a first preset number of temperature detection units, where the first preset number is greater than one. All the first preset number of temperature detection units measure the temperature at the same temperature detection point of the electrical equipment or component, which helps improve the accuracy of temperature detection. The first preset number of temperature detection units has a second preset number of different types, where the second preset number is greater than one, meaning the types of the first preset number of temperature detection units are not completely identical. Thus, this embodiment of the invention sets at least two different types of temperature detection units at the same temperature detection point. Even if some types of temperature detection units fail or malfunction, the temperature of the electrical equipment or component can still be accurately measured by any of the remaining types of temperature detection units. For cases where only the same type of temperature detection units are set, it effectively prevents all temperature detection units from malfunctioning simultaneously. Therefore, the control module can perform over-temperature protection based on accurate temperature data, thereby improving the reliability of the over-temperature protection function for electrical equipment or components and reducing the occurrence of failures during operation.

[0033] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of an over-temperature protection device according to an embodiment of the present utility model;

[0036] Figure 2 This is a structural schematic diagram of another over-temperature protection device provided according to an embodiment of the present utility model;

[0037] Figure 3 This is a schematic diagram of the specific structure of an over-temperature protection device according to an embodiment of the present utility model;

[0038] Figure 4 This is a structural schematic diagram of another over-temperature protection device provided according to an embodiment of the present utility model;

[0039] Figure 5 This is a schematic diagram of the specific structure of another over-temperature protection device provided according to an embodiment of the present utility model;

[0040] Figure 6 This is a schematic diagram of the specific structure of another over-temperature protection device provided according to an embodiment of the present utility model;

[0041] Figure 7 This is a schematic diagram of the specific structure of another over-temperature protection device provided according to an embodiment of the present utility model;

[0042] Figure 8 This is a schematic diagram of the specific structure of another over-temperature protection device provided according to an embodiment of the present utility model. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] This utility model embodiment provides an over-temperature protection device. Figure 1 This is a schematic diagram of an over-temperature protection device provided in an embodiment of the present utility model. Figure 1 As shown, the over-temperature protection device includes a control module 10 and a temperature detection module 20.

[0046] The output terminal of the temperature detection module 20 is electrically connected to the control module 10; the temperature detection module 20 includes a first preset number of temperature detection units 21; each temperature detection unit 21 is set at the same temperature detection point and is used to detect the temperature at the same temperature detection point; each temperature detection unit 21 is electrically connected to the output terminal of the temperature detection module 20 in series or in parallel; the first preset number of temperature detection units 21 has a second preset number of types; wherein, both the first preset number and the second preset number are greater than 1.

[0047] For example, see Figure 1The output terminal X of the temperature detection module 20 is electrically connected to the control module 10. The temperature detection module 20 may include a first preset number of temperature detection units 21, and each temperature detection unit 21 detects the temperature at the same temperature detection point in the electrical equipment or component. The output terminals of each temperature detection unit 21 can be indirectly electrically connected to the output terminal X of the temperature detection module 20 in series; or, the output terminals of each temperature detection unit 21 can be directly electrically connected to the output terminal X of the temperature detection module 20 in parallel, without limitation. For example, the first preset number can be at least two. All of the first preset number of temperature detection units 21 can transmit data with the control module 10. By setting at least two temperature detection units 21, at least two sets of temperature data at the same temperature detection point can be obtained, which is beneficial to improving the accuracy of temperature detection. Furthermore, in this embodiment of the present invention, the first preset number of temperature detection units 21 set at the same temperature detection point may include a second preset number of types, that is, temperature detection units 21 using different temperature measurement principles measure the temperature at the same temperature detection point. In this way, if a certain type of temperature detection unit 21 fails or malfunctions during operation, the temperature of the electrical equipment or components can be accurately measured by any of the other types of temperature detection units 21 that operate normally according to other temperature measurement principles. Compared with the related technology of setting up a single temperature detection unit of the same type for temperature measurement, this utility model embodiment can effectively prevent the situation where all temperature detection units fail or malfunction simultaneously, thereby improving the reliability of the over-temperature protection function for electrical equipment or components and reducing the occurrence of faults in electrical equipment or components during operation.

[0048] The over-temperature protection device provided in this embodiment includes a control module and a temperature detection module electrically connected to the control module. The temperature detection module includes a first preset number of temperature detection units, where the first preset number is greater than one. All the first preset number of temperature detection units measure the temperature at the same temperature detection point of the electrical equipment or component, which helps improve the accuracy of temperature detection. The first preset number of temperature detection units has a second preset number of different types, where the second preset number is greater than one, meaning the types of the first preset number of temperature detection units are not completely identical. Thus, this embodiment of the invention sets at least two different types of temperature detection units at the same temperature detection point. Even if some types of temperature detection units fail or malfunction, the temperature of the electrical equipment or component can still be accurately measured by any of the remaining types of temperature detection units. For cases where only the same type of temperature detection units are set, it effectively prevents all temperature detection units from malfunctioning simultaneously. Therefore, the control module can perform over-temperature protection based on accurate temperature data, thereby improving the reliability of the over-temperature protection function for electrical equipment or components and reducing the occurrence of failures during operation.

[0049] Optionally, based on the above embodiments, see below. Figure 1 The second preset quantity is less than or equal to the first preset quantity.

[0050] Specifically, the number of temperature detection units 21 set in the temperature detection module 20 is a first preset number, and the number of types of temperature detection units 21 is a second preset number. The second preset number can be set to be less than or equal to the first preset number. For example, if the second preset number is equal to the first preset number, it means that the types of temperature detection units 21 are all different; if the second preset number is less than the first preset number, it means that some of the temperature detection units 21 in the first preset number are of the same type. Neither of these two situations is limited here. In this embodiment, as long as the types of multiple temperature detection units 21 are not completely identical, it can effectively address the situation in related technologies where only the same type of temperature detection units are set, resulting in simultaneous malfunction of all temperature detection units, thereby improving the reliability of over-temperature protection for electrical equipment or components.

[0051] Optionally, based on the above embodiments, the temperature detection unit 21 includes at least two of the following: a temperature sensing chip, a thermistor, a thermocouple, and a temperature switch.

[0052] Thermistors, based on their temperature characteristics, can be classified into negative temperature coefficient thermistors (NTC), positive temperature coefficient thermistors (PTC), and critical temperature resistors (CTR). NTCs operate on the principle that resistance decreases as temperature increases and increases as temperature decreases. PTCs operate on the principle that resistance increases as temperature increases and decreases as temperature decreases. CTRs operate on the principle that resistance drops sharply within a certain temperature range. Temperature switches operate on the principle that when the detected temperature exceeds its operating temperature, the switch opens (or closes); when the detected temperature reaches the recovery temperature, the switch closes (or opens). The over-temperature protection device provided in this embodiment can use various types of temperature sensors as the temperature detection unit 21 for combination and can detect the temperature of any electrical equipment or component. It has the advantages of strong versatility and simple principle, and is not limited here.

[0053] The electrical connection topology between the first preset number of temperature detection units 21 and the control module 10 can include various forms. The following embodiments will provide examples to illustrate the possible electrical connection topologies between the temperature detection units 21 and the control module 10.

[0054] Optionally, Figure 2 This is a structural schematic diagram of another over-temperature protection device provided in an embodiment of this utility model. Based on the above embodiments, as follows... Figure 2 As shown, a first preset number of temperature detection units 21 are connected in series and electrically connected to the control module 10.

[0055] Specifically, the temperature detection units 21 of the first preset number set in the temperature detection module 20 are connected in series, and then electrically connected to the control module 10. In this way, only one port of the control module 10 is needed to achieve electrical connection with the first preset number of temperature detection units 21, so that the control module 10 can realize over-temperature protection for electrical equipment or components based on the temperature data collected by any one of the temperature detection units 21.

[0056] It should be noted that the series connection order of different types of temperature detection units 21 is not limited. In other words, the distance between the connection position of different types of temperature detection units 21 and the control module 10 does not affect the implementation of the over-temperature protection function. The control module 10 only needs to receive accurate temperature data collected by any one of the temperature detection units 21 to realize over-temperature protection for electrical equipment or components, which helps to improve the reliability of over-temperature protection.

[0057] For example, Figure 3 This is a schematic diagram of the specific structure of an over-temperature protection device provided in an embodiment of this utility model. Taking the temperature detection module 20, which includes two temperature detection units 21, one of which is an NTC 211 and the other is a temperature switch 212, as an example, the above-mentioned series connection method will be explained. Figure 3 As shown, both cables of the NTC211 are electrically connected to the control module 10, and the temperature switch 212 is mounted on one of the cables of the NTC211; alternatively, the temperature switch 212 can be connected in series with the NTC211 on the side furthest from the control module 10. It should be noted that when the temperature switch 212 is connected in series with the NTC211, a normally closed temperature switch is used. There are two possible abnormalities with the NTC211: one is that the NTC211 fails directly, meaning its resistance does not change with temperature; the other is that the resistance of the NTC211 changes abnormally with temperature. When the NTC211 fails or malfunctions, the temperature switch connected in series with the NTC211 can still measure temperature and operate normally; when the temperature switch 212 malfunctions and cannot disconnect, the resistance of the NTC211 still changes normally with temperature. The control module 10 can trigger the built-in protection logic based on the resistance signal received from the NTC211 and the corresponding temperature corresponding to different resistance values, thereby realizing over-temperature protection for electrical equipment or components.

[0058] Optionally, Figure 4 This is a structural schematic diagram of another over-temperature protection device provided in an embodiment of this utility model. Based on the above embodiments, as follows... Figure 4 As shown, the temperature detection module 20 includes at least two temperature detection groups 22; the at least two temperature detection groups 22 are electrically connected to the control module 10 respectively; each temperature detection group 22 includes at least one temperature detection unit 21.

[0059] Specifically, the temperature detection module 20 may also include at least two temperature detection groups 22, each connected in parallel to the control module 10. That is, each temperature detection group 22 is electrically connected to one port of the control module 10, and the control module 10 can directly receive temperature data collected by any one of the temperature detection groups 22. Each temperature detection group 22 may include at least one temperature detection unit 21. This allows the control module 10 to implement over-temperature protection by receiving accurate temperature data collected by any of the remaining temperature detection units 21 when some temperature detection units 21 fail or malfunction. For example, each temperature detection group 22 includes one temperature detection unit 21. Figure 4 This illustration shows a configuration where each temperature detection group 22 includes one temperature detection unit 21. Each temperature detection unit 21 is connected in parallel with the control module 10, and the types of temperature detection units 21 are not entirely the same. By setting temperature detection units 21 with different temperature measurement principles to measure the same temperature detection point, the problem of low reliability of over-temperature protection functions for electrical equipment or components when one temperature detection unit 21 malfunctions can be effectively avoided.

[0060] For example, Figure 5 This is a schematic diagram of the specific structure of another over-temperature protection device provided in this utility model embodiment. Figure 5 The illustration shows a temperature detection module 20 comprising two temperature detection groups 22, each temperature detection group 22 including a temperature detection unit 21, with the two temperature detection groups 22 connected in parallel to the control module 10. Exemplarily, in this embodiment, taking an NTC 211 and a temperature switch 212 as examples, the NTC 211 and temperature switch 212 are connected in parallel, and the temperature switch 212 is a normally open temperature switch. When the temperature at the temperature detection point changes, the resistance of the NTC 211 changes, or the temperature exceeds the operating temperature of the temperature switch 212, causing the temperature switch 212 to close. The control module 10 triggers its built-in protection logic based on the received resistance signal of the NTC 211 or the closing signal of the temperature switch 212, thereby achieving over-temperature protection.

[0061] It should be noted that the electrical connection topology between the first preset number of temperature detection units 21 and the control module 10 can include various forms, and the combination of the second preset number of types of temperature detection units 21 can also include various forms, which cannot be exhaustively listed. The following embodiments will exemplify the possible electrical connection topologies between the temperature detection units 21 and the control module 10, rather than limiting the selection of the number and types of temperature detection units 21 or the electrical connection topology between the temperature detection units 21 and the control module 10.

[0062] Optionally, based on the above embodiments, each temperature detection group 22 includes at least two temperature detection units 21; each temperature detection unit 21 has at least two types.

[0063] Specifically, each temperature detection group 22 may include at least two temperature detection units 21, and all temperature detection units 21 may include at least two types of temperature sensors to improve the reliability of the over-temperature protection function.

[0064] For example, the following embodiments use the temperature detection module 20 as an example, which includes two temperature detection groups 22, and each temperature detection group 22 includes two temperature detection units 21, to illustrate possible implementation methods.

[0065] One feasible implementation, exemplarily, is that the temperature detection units 21 within each temperature detection group 22 are of the same type; and the temperature detection units 21 between each temperature detection group 22 have at least two types.

[0066] Optionally, the temperature detection module 20 includes a first temperature detection group 221 and a second temperature detection group 222. The first temperature detection group 221 and the second temperature detection group 222 each include two temperature detection units 21. The temperature detection unit 21 in the first temperature detection group 221 includes a negative temperature coefficient thermistor, and the temperature detection unit 21 in the second temperature detection group 222 includes a temperature switch. In the first temperature detection group 221, each negative temperature coefficient thermistor is connected in parallel to the control module 10. In the second temperature detection group 222, each temperature switch is connected in parallel to the control module 10. The temperature switch includes a normally open temperature switch.

[0067] For example, Figure 6 This is a schematic diagram illustrating the specific structure of another over-temperature protection device provided in this embodiment of the utility model. See also... Figure 6 This allows both temperature detection units 21 in the first temperature detection group 221 to use NTC 211, and both temperature detection units 21 in the second temperature detection group 222 to use temperature switches 212, to measure the temperature at the same detection point. This ensures that even if some of the temperature detection units 21 malfunction, the accurate temperature data collected by the remaining temperature detection units 21 can reliably achieve over-temperature protection. Figure 6 The diagram shows two NTC211s connected in parallel and two temperature switches 212 connected in parallel. Figure 6The temperature switch 212 in the control module is a normally open temperature switch. When the detected temperature exceeds the operating temperature of the temperature switch 212, any one of the normally open temperature switches will close, and the control module 10 will activate the over-temperature protection for the electronic equipment or components based on the closing signal of any one of the temperature switches; or, when the resistance value of the NTC 211 drops below the resistance threshold, it indicates that the detected temperature is too high, so as to realize the over-temperature protection for the electronic equipment or components.

[0068] Optionally, the temperature detection module 20 includes a first temperature detection group 221 and a second temperature detection group 222. The first temperature detection group 221 and the second temperature detection group 222 each include two temperature detection units 21. The temperature detection unit 21 in the first temperature detection group 221 includes a negative temperature coefficient thermistor, and the temperature detection unit 21 in the second temperature detection group 222 includes a temperature switch. In the first temperature detection group 221, each negative temperature coefficient thermistor is connected in parallel to the control module 10. In the second temperature detection group 222, each temperature switch is connected in series to the control module 10. The temperature switch includes a normally closed temperature switch.

[0069] For example, Figure 7 This is a schematic diagram illustrating the specific structure of another over-temperature protection device provided in this embodiment of the utility model. See also... Figure 7 It shows a configuration where two NTC211s are connected in series and two temperature switches 212 are connected in series. Figure 7 The temperature switch 212 in the control module is a normally closed temperature switch. When the detected temperature exceeds the operating temperature of the temperature switch 212, any one of the normally closed temperature switches will open, and the control module will activate over-temperature protection for the electronic equipment or components based on the opening signal of any one of the temperature switches. If one of the NTCs 211 in the first temperature detection group 221 fails, over-temperature protection can still be achieved by relying on the temperature switch 212 in the second temperature detection group 222; if one of the NTCs 211 in the first temperature detection group 221 malfunctions, over-temperature protection can still be achieved by relying on the other NTC 211 in the first temperature detection group 221 and the temperature switch 212 in the second temperature detection group 222, which helps to improve the reliability of over-temperature protection.

[0070] In another possible implementation, the temperature detection units 21 in each temperature detection group 22 are of the same type; and the temperature detection units 21 in each temperature detection group 22 have at least two types.

[0071] For example, the temperature detection module 20 includes a first temperature detection group 221 and a second temperature detection group 222. The first temperature detection group 221 and the second temperature detection group 222 each include two temperature detection units 21. The temperature detection unit 21 in the first temperature detection group 221 and the temperature detection unit 21 in the second temperature detection group 222 each include a negative temperature coefficient thermistor and a temperature switch. In the first temperature detection group 221, the negative temperature coefficient thermistor and the temperature switch are connected in series in the control module 10. The temperature switch includes a normally closed temperature switch. In the second temperature detection group 222, the negative temperature coefficient thermistor and the temperature switch are connected in parallel in the control module 10. The temperature switch includes a normally open temperature switch.

[0072] Specifically, Figure 8 This is a schematic diagram illustrating the specific structure of another over-temperature protection device provided in this embodiment of the utility model. See also... Figure 8 Both temperature detection units 21 in the first temperature detection group 221 and the second temperature detection group 222 employ NTC 211 and temperature switch 212 to measure the temperature at the same temperature detection point. In each temperature detection group 22, the NTC 211 and temperature switch 212 can be connected in series or in parallel; no restriction is imposed here. Figure 8 The diagram shows that NTC 211 and temperature switch 212 in the first temperature detection group 221 are connected in series, and NTC 211 and temperature switch 212 in the second temperature detection group 222 are connected in parallel. The series connection order of NTC 211 and temperature switch 212 in each temperature detection group 22 is not restricted. In the series connection, temperature switch 212 is a normally closed temperature switch; in the parallel connection, temperature switch 212 is a normally open temperature switch. This ensures that even if some of the temperature detection units 21 malfunction, the over-temperature protection function can still be reliably implemented using accurate temperature data collected by any of the remaining temperature detection units 21.

[0073] This utility model embodiment also provides an over-temperature protection system. The over-temperature protection system includes a component under test (DUT) and the over-temperature protection device provided in any of the above embodiments. The DUT may include an electrical device under test (EDT) or a component under test, without limitation. The over-temperature protection device detects the temperature of the DUT and activates over-temperature protection when the temperature of the DUT exceeds a temperature threshold. The temperature threshold can be represented by a signal indicating the action of a temperature detection unit based on different temperature measurement principles. For example, for an NTC, a DUT temperature exceeding the temperature threshold can be represented by the NTC resistance exceeding the resistance signal corresponding to the temperature threshold; for a temperature switch, the temperature threshold can be the operating temperature of the temperature switch, meaning a DUT temperature exceeding the temperature threshold can be represented by the temperature exceeding the operating temperature of the temperature switch, causing the temperature switch to open and output an open-circuit signal. By using at least two temperature detection units with different temperature measurement principles to measure the temperature at the same temperature detection point, it can be ensured that even if some temperature detection units fail or malfunction, over-temperature protection can still be achieved through accurate temperature data collected by any of the remaining temperature detection units. This helps to improve the reliability of over-temperature protection for electrical equipment or components and reduce the occurrence of failures in electrical equipment or components during operation.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An over-temperature protection device, characterized in that, include: Control module and temperature detection module; The output terminal of the temperature detection module is electrically connected to the control module. The temperature detection module includes a first preset number of temperature detection units; each of the temperature detection units is set at the same temperature detection point and is used to detect the temperature at the same temperature detection point. Each of the temperature detection units is electrically connected to the output terminal of the temperature detection module in series or in parallel. The first preset number of temperature detection units has a second preset number of types; wherein, both the first preset number and the second preset number are greater than 1.

2. The over-temperature protection device according to claim 1, characterized in that, The temperature detection module includes at least two temperature detection groups; each of the at least two temperature detection groups is electrically connected to the control module. Each of the temperature detection groups includes at least one of the temperature detection units.

3. The over-temperature protection device according to claim 2, characterized in that, Each of the temperature detection groups includes one of the temperature detection units; Alternatively, each of the temperature detection groups may include at least two of the temperature detection units; Each of the temperature detection units has at least two types.

4. The over-temperature protection device according to claim 3, characterized in that, Each temperature detection unit within each of the aforementioned temperature detection groups is of the same type; The temperature detection units in each of the temperature detection groups are of at least two types.

5. The over-temperature protection device according to claim 4, characterized in that, The temperature detection module includes a first temperature detection group and a second temperature detection group, and the first temperature detection group and the second temperature detection group each include two temperature detection units; The temperature detection unit in the first temperature detection group includes a negative temperature coefficient thermistor, and the temperature detection unit in the second temperature detection group includes a temperature switch; In the first temperature detection group, each of the negative temperature coefficient thermistors is connected in parallel to the control module; In the second temperature detection group, each of the temperature switches is connected in parallel to the control module; wherein, the temperature switch includes a normally open temperature switch.

6. The over-temperature protection device according to claim 4, characterized in that, The temperature detection module includes a first temperature detection group and a second temperature detection group, and the first temperature detection group and the second temperature detection group each include two temperature detection units; The temperature detection unit in the first temperature detection group includes a negative temperature coefficient thermistor, and the temperature detection unit in the second temperature detection group includes a temperature switch; In the first temperature detection group, each of the negative temperature coefficient thermistors is connected in parallel to the control module; In the second temperature detection group, each of the temperature switches is connected in series to the control module; wherein, the temperature switch includes a normally closed temperature switch.

7. The over-temperature protection device according to claim 3, characterized in that, The temperature detection units in each of the aforementioned temperature detection groups are of the same type; Each of the temperature detection groups has at least two types of temperature detection units.

8. The over-temperature protection device according to claim 7, characterized in that, The temperature detection module includes a first temperature detection group and a second temperature detection group, and the first temperature detection group and the second temperature detection group each include two temperature detection units; The temperature detection unit in the first temperature detection group and the temperature detection unit in the second temperature detection group respectively include a negative temperature coefficient thermistor and a temperature switch; In the first temperature detection group, the negative temperature coefficient thermistor is connected in series with the temperature switch in the control module; wherein, the temperature switch includes a normally closed temperature switch. In the second temperature detection group, the negative temperature coefficient thermistor is connected in parallel with the temperature switch to the control module; wherein, the temperature switch includes a normally open temperature switch.

9. The over-temperature protection device according to claim 1, characterized in that, The temperature detection unit includes at least two of the following: a temperature sensing chip, a thermistor, a thermocouple, and a temperature switch.

10. An over-temperature protection system, characterized in that, The device includes a component under test and an over-temperature protection device as described in any one of claims 1-9, wherein the over-temperature protection device is used to detect the temperature of the component under test and to activate over-temperature protection for the component under test when the temperature of the component under test is higher than a temperature threshold.

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