Over-temperature protection circuit for switch equipment and switch power supply

Abstract

The utility model relates to an over-temperature protection circuit for a switch device and a switch power supply, the over-temperature protection circuit comprises a temperature detection module, a cooling module, a current detection module, a gateway, a temperature control module and a protection element, the temperature of the switch device is monitored in real time by performing temperature and current detection on the switch device, and when the temperature of the switch device is abnormal, the temperature of the switch device is not abnormal. The switch device is connected to the cooling module, the protection element is controlled to cut off the connection between the power supply and the switch device, the over-temperature protection precision of the switch device is greatly improved, the gateway receives and forwards the state information of the temperature detection module and the current detection module to give an alarm, the timeliness of the over-temperature protection of the switch device is improved, and the user experience is improved. Therefore, the method has wide applicability.

Description

Technical Field

[0001] The present application relates to the field of power electronics, and in particular to an over-temperature protection circuit and a switching power supply for a switching device. Background Art

[0002] Switchgear, also known as distribution equipment, is a general term for power distribution equipment in power systems, including high-voltage distribution cabinets, generators, transformers, power lines, circuit breakers, low-voltage switchgear, distribution panels, switch boxes, and control boxes. It is primarily used in power generation, transmission, distribution, and conversion processes, and involves a combination of switchgear and their associated control, detection, protection, and regulation equipment. However, overheating in switchgear can easily lead to insulation degradation, resulting in insufficient insulation to ground, leading to equipment short circuits and damage. Existing switchgear often relies on inspections to detect problems, making it difficult to ensure the timely effectiveness of overtemperature protection.

[0003] It should be noted that the above introduction to the technical background is merely intended to provide a clear and complete description of the technical solutions of this application and facilitate understanding by those skilled in the art. Simply because these solutions are described in the background technology section of this application, it should not be assumed that the above technical solutions are well known to those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide an over-temperature protection circuit and a switching power supply for a switching device, so as to solve the problems of poor timeliness and low accuracy of thermal protection of the switching device in the prior art.

[0005] In order to solve the above problems, the present application relates to an over-temperature protection circuit for a switching device that adopts the following technical solutions:

[0006] The over-temperature protection circuit for a switch device includes a temperature detection module, a temperature reduction module, a current detection module, a gateway, a temperature control module, and a protection element, wherein:

[0007] The protection element is connected between the power supply and the switch device; the temperature detection module is connected to the switch device to monitor the temperature of the switch device in real time; the cooling module is connected to the temperature detection module; the temperature control module is connected to the temperature detection module, the cooling module and the switch device; the current detection module is connected to the protection element and the switch device; the gateway is connected to the temperature detection module and the current detection module;

[0008] Among them, when the temperature of the switching device is abnormal, the temperature detection module controls the temperature control module to close, so that the cooling module is connected to the switching device, and the current detection module controls the protection element to disconnect the power supply from the switching device; the gateway receives and forwards the status information of the temperature detection module and the current detection module to issue an alarm.

[0009] In order to solve the above problems, a switching power supply involved in this application adopts the following technical solutions:

[0010] The switching power supply includes the over-temperature protection circuit for the switching device involved in this application.

[0011] The beneficial effects of this application are as follows:

[0012] By performing dual detection of temperature and current on the switchgear, the temperature of the switchgear is monitored in real time. When the temperature of the switchgear is abnormal, the switchgear is connected to the cooling module and the power supply is cut off from the switchgear through the control protection element, which greatly improves the accuracy of the over-temperature protection of the switchgear. The status information of the temperature detection module and the current detection module is received and forwarded via the gateway to issue an alarm, thereby improving the timeliness of the over-temperature protection of the switchgear, and thus has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments:

[0014] Figure 1 A schematic structural diagram of an over-temperature protection circuit for a switching device provided in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of the structure of a temperature detection module provided in an embodiment of the present application;

[0016] Figure 3 A schematic structural diagram of a current detection module provided in an embodiment of the present application;

[0017] Figure 4 This is a structural diagram of another current detection module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the technical objectives, technical solutions, and beneficial effects of this application more clear, the technical solutions of this application are further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. That is, the embodiments described herein are only some embodiments of this application, not all embodiments. Generally, the components of the embodiments of this application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] Figure 1 This is a schematic diagram of the structure of an over-temperature protection circuit for a switching device provided in an embodiment of the present application. Figure 1As shown, the over-temperature protection circuit includes but is not limited to a temperature detection module, a cooling module, a current detection module, a gateway, a temperature control module and a protection element, wherein:

[0020] Switchgear primarily consists of electronic components and mechanical parts. Electronic components, such as electromagnets and contacts, are used to control the on / off state of circuits. Mechanical components, such as springs and buttons, physically control the on / off state of circuits. The operating principle of switchgear typically involves electromagnetic principles. For example, switchgear uses devices such as electromagnets to control the state of contacts. When the electromagnet is energized, it generates a magnetic field, causing the contacts to close or open, thereby controlling the on / off state of the entire circuit.

[0021] In this embodiment, if Figure 1 As shown, the protection element is connected between the power supply and the switchgear. This ensures that if parameters such as current, voltage, and temperature exceed normal ranges during power supply, the protection element will respond quickly and disconnect the power supply from the switchgear, preventing damage to the switchgear or more serious safety incidents. The temperature detection module is connected to the switchgear to monitor temperature information on the switchgear in real time, ensuring safe operation and preventing overheating. The cooling module is connected to the temperature detection module to ensure that the switchgear operates within an appropriate temperature range. The temperature control module is connected to the temperature detection module, the cooling module, and the switchgear. It receives real-time temperature data collected by the temperature detection module and compares it with preset temperature thresholds to control the cooling module and the switchgear to maintain the switchgear temperature within an appropriate range. The current detection module is connected to the protection element and the switchgear to determine the operating status of the switchgear by detecting current intensity. Current and temperature are interrelated and jointly affect the safe operation of the switchgear. Excessive current can cause the switchgear to generate excessive heat, leading to overheating. Excessive temperature can damage internal components of the switchgear or cause a fire.

[0022] Furthermore, when the temperature of the switch device is abnormal, the temperature detection module controls the temperature control module to close, so that the cooling module is connected to the switch device, and the cooling module cools the switch device; the current detection module detects and monitors the operating current of the switch device. If the current is abnormal, the power supply is disconnected from the switch device by controlling the protection element to prevent accidents. The gateway is connected to the temperature detection module and the current detection module, and can receive data from the temperature detection module and the current detection module, and send this data to the remote server or cloud platform through the network for processing and analysis, so that users can remotely monitor the operating status of the switch device and promptly discover and deal with potential heating problems of the switch device.

[0023] Alternatively, as an example, Figure 2 This is a schematic diagram of the structure of a temperature detection module provided in an embodiment of the present application. Figure 2 As shown, the temperature detection module includes a temperature sensing unit, a signal conversion unit, a first communication unit and a first driving unit, wherein:

[0024] The temperature sensing unit in the temperature detection module is connected to the switchgear. Specifically, the temperature sensing unit is responsible for collecting temperature information from the switchgear's surrounding environment and its internal operating environment, and can convert the sensed temperature into a usable output signal. By way of example, the temperature sensing unit includes thermocouples, thermal resistors, and thermistors. Thermocouples measure temperature by utilizing the thermoelectric potential generated by two dissimilar metal conductors under a temperature difference; thermal resistors measure temperature by utilizing the property that their resistance changes with temperature. It should be noted that the temperature sensing unit includes, but is not limited to, thermocouples, thermal resistors, and thermistors. Silicon temperature sensors or gallium arsenide temperature sensors can also be used to utilize the temperature characteristics of semiconductor devices to obtain temperature information from the switchgear's surrounding environment and its internal operating environment. Infrared temperature sensors can also be used to determine temperature information by measuring infrared energy radiated from the switchgear's surface based on the relationship between surface radiation energy and temperature. Optical fiber temperature sensors can also be used to determine temperature information by measuring the propagation time or phase difference of light in an optical fiber based on the relationship between the propagation characteristics of light in the optical fiber and temperature. The appropriate configuration of the temperature sensing unit should be selected based on actual needs and will not be detailed here.

[0025] like Figure 2 As shown, the signal conversion unit in the temperature detection module is connected between the temperature sensing unit and the temperature control module, and converts the temperature information collected by the temperature sensing unit into a recognizable electrical signal. If the electrical signal is relatively weak, it can also be amplified by an amplifier; at the same time, in order to remove noise and interference signals, a filter is also required to perform filtering operations. The electrical signal after amplification and filtering operations can be displayed through a display device, or it can be remotely transmitted through a communication interface (such as RS-485, Wi-Fi, Bluetooth, etc.) for further processing and analysis. Furthermore, when the temperature of the switching device is abnormal, the signal conversion unit generates a control signal to drive the temperature control module to close based on the collected temperature information, connects the cooling module to the switching device, and performs a cooling operation on the switching device through the cooling module.

[0026] It is necessary to add that, if Figure 1As shown, the cooling module of the over-temperature protection circuit includes air-cooled cooling equipment, water-cooled cooling equipment, and heat pipe cooling equipment. Among them, the air-cooled cooling equipment is based on the thermal motion ability of air. When the temperature of the switch device is high, the molecules in the air will contact the surface of the switch device and take away the heat. The air-cooled cooling equipment is usually composed of a fan, a heat sink and heat fins. The fan generates airflow by rotating and blows the air to the heat sink or heat fins. These heat dissipation elements are usually composed of many thin and dense metal sheets to increase the surface area and improve the heat exchange efficiency. When the air blows from the fan through the heat dissipation element, the heat on the surface of the object will be transferred to the air molecules. The heat is then carried away by the fan and exchanges heat with the low-temperature air in the environment, thereby achieving a cooling effect. Water-cooled cooling equipment sends water into the heat exchanger of the switchgear through a water circulation system to exchange heat with the object or medium to be cooled. Heat pipe cooling equipment is usually filled with a liquid working fluid with a low boiling point and high latent heat of vaporization. Based on the heat pipe effect, when the first end of the heat pipe receives heat from the switchgear, the working fluid will quickly evaporate and absorb a large amount of heat. The vapor then flows to the second end of the heat pipe, condenses at the second end, and releases heat. The condensed working fluid then flows back to the first end through capillary action or gravity, completing a cycle. The appropriate setting of the cooling module should be selected according to actual needs, and will not be elaborated here.

[0027] like Figure 2 As shown, the first communication unit in the temperature detection module is connected between the signal conversion unit and the gateway, and remotely transmits the output signal of the signal conversion unit for further processing and analysis. Specifically, the first communication unit includes a Zigbee network device, wherein the Zigbee network device is suitable for low-speed short-distance transmission, has the characteristics of low power consumption, low complexity, and support for a large number of node transmissions. It can also be based on 5G and other high-speed network technologies for data transmission. It should be noted that the first communication unit includes but is not limited to Zigbee network devices, and can also adopt Z-Wave network devices, LoRa (LongRange) network devices, etc. The appropriate setting form of the first communication unit should be selected according to actual needs, which will not be repeated here.

[0028] It should be noted that if Figure 1 and Figure 2 As shown, the temperature control module in the over-temperature protection circuit includes a temperature switch and a temperature fuse. When the temperature of the switching device is abnormal, the temperature switch or the temperature fuse is closed to connect the cooling module with the switching device, thereby realizing the cooling operation of the cooling module on the switching device. The appropriate setting form of the temperature control module should be selected according to actual needs, which will not be repeated here.

[0029] It should be noted that the temperature detection module can also be configured using a dedicated integrated circuit (ASIC). An ASIC is an integrated circuit designed and manufactured for a proprietary application program for specific user requirements and specific systems. In this embodiment, the integrated circuit is characterized as a stability detection circuit), an IP core (an IP core is a mature design of a circuit module with independent functions in chip or integrated circuit design. This circuit design can be applied to other chip or integrated circuit design projects that include this circuit module, thereby reducing the design workload, shortening the design cycle, and improving the success rate of chip or integrated circuit design. IP cores are classified into three levels: behavioral level, structural level, and physical level. Therefore, there are three types of IP cores: soft cores designed with hardware description language, solid cores with complete structural description, and hard cores based on physical description and process verification. The specific configuration forms are not detailed here. As long as the temperature of the switching device can be detected and the temperature control module is driven to close when the temperature is abnormal, thereby ensuring the cooling efficiency of the cooling module on the switching device, any configuration form of the temperature detection module is applicable, and is not limited to this embodiment.

[0030] Alternatively, as an example, Figure 3 This is a structural diagram of a current detection module provided in an embodiment of the present application. Figure 3 As shown, the current detection module includes a current sensor, a current relay, a time delay relay and a second communication unit, wherein the current sensor is connected to the switching device, and is used to measure the current of one phase or three phases of the switching device, and convert the detected information into an electrical signal or other required form of information output that meets the standard requirements according to a certain rule; the current relay is connected to the current sensor, and can detect the current size of the switching device, and automatically perform a switching action when the current exceeds or falls below the set value; the time delay relay is connected between the current relay and the protection element, has a timing function, and performs delay control based on electromagnetic attraction and release. When the control takes effect, a magnetic field is generated in the electromagnetic coil, causing the contacts to attract, thereby connecting the current relay to the protection element. After the control fails, the magnetic field in the electromagnetic coil will gradually weaken, and the contacts will release after a certain delay, disconnecting the current relay from the protection element; the second communication unit is connected between the current relay and the gateway, wherein the second communication unit is used to remotely transmit the current detection information for further processing and analysis.

[0031] Alternatively, as an example, Figure 4 This is a structural diagram of another current detection module provided in an embodiment of the present application. Figure 4As shown, the current detection module also includes a Hall element, a signal processing unit and a third communication unit, wherein the Hall element is connected to the switching device, and generates a potential difference signal proportional to the current intensity based on the current of the switching device; the signal processing unit is connected between the Hall element and the protection element, and is used to amplify and filter the potential difference signal generated by the Hall element. When the current is abnormal, the protection element is controlled to disconnect the power supply from the switching device to prevent accidents; the third communication unit is connected between the signal processing unit and the gateway, and is used to remotely transmit the current detection information for further processing and analysis.

[0032] It should be noted that if Figure 1 、 Figure 3 and Figure 4 As shown, the protection elements in the over-temperature protection circuit include a circuit breaker and a trip coil. The appropriate setting form of the protection elements should be selected according to actual needs, and will not be described in detail here.

[0033] It should be noted that the current detection module can also be set up using a dedicated integrated circuit, IP core, etc., and its specific setting form will not be described here one by one. As long as it can detect and monitor the operating current of the switching device and disconnect the power supply and the switching device by controlling the protection element when the current is abnormal to prevent accidents, any setting form of the current detection module is applicable and is not limited to this embodiment.

[0034] In summary, by performing dual detection of temperature and current on the switch device, the temperature of the switch device is monitored in real time. When the temperature of the switch device is abnormal, the switch device is connected to the cooling module and the power supply is cut off from the switch device through the control protection element. This greatly improves the accuracy of the over-temperature protection of the switch device. The status information of the temperature detection module and the current detection module is received and forwarded via the gateway to issue an alarm, thereby improving the timeliness of the over-temperature protection of the switch device. Therefore, it has wide applicability.

[0035] In particular, according to embodiments of the present application, the schematic diagram of the over-temperature protection circuit for a switching device referenced above can be implemented as a switching power supply. In exemplary embodiments, the switching power supply can perform dual temperature and current detection on the switching device, monitoring the switching device temperature in real time. It can also detect and monitor the operating current of the switching device and, if the current is abnormal, disconnect the power supply from the switching device to prevent accidents.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate and not to limit the technical solutions of this application. Any equivalent replacements of this application and modifications or partial replacements that do not depart from the spirit and scope of this application should be included in the scope of protection of the claims of this application.

Claims

1. An over-temperature protection circuit for a switching device, characterized in that: include: Temperature detection module, cooling module, current detection module, gateway, temperature control module and protection components, including: The protection element is connected between the power supply and the switch device; the temperature detection module is connected to the switch device to monitor the temperature of the switch device in real time; the cooling module is connected to the temperature detection module; the temperature control module is connected to the temperature detection module, the cooling module and the switch device; the current detection module is connected to the protection element and the switch device; the gateway is connected to the temperature detection module and the current detection module; Among them, when the temperature of the switching device is abnormal, the temperature detection module controls the temperature control module to close, so that the cooling module is connected to the switching device, and the current detection module controls the protection element to disconnect the power supply from the switching device; the gateway receives and forwards the status information of the temperature detection module and the current detection module to issue an alarm.

2. The over-temperature protection circuit according to claim 1, characterized in that: The temperature detection module includes a temperature sensing unit, a signal conversion unit and a first communication unit, wherein the temperature sensing unit is connected to the switching device; the signal conversion unit is connected between the temperature sensing unit and the temperature control module; and the first communication unit is connected between the signal conversion unit and the gateway.

3. The over-temperature protection circuit according to claim 2, characterized in that: The temperature sensing unit includes a thermocouple, a thermal resistor, and a thermistor.

4. The over-temperature protection circuit according to claim 2, characterized in that: The first communication unit includes a Zigbee network device.

5. The over-temperature protection circuit according to claim 1, characterized in that: The cooling module includes air-cooled cooling equipment, water-cooled cooling equipment, and heat pipe cooling equipment.

6. The over-temperature protection circuit according to claim 1, characterized in that: The current detection module includes a current sensor, a current relay, a time delay relay and a second communication unit, wherein the current sensor is connected to the switching device; the current relay is connected to the current sensor; the time delay relay is connected between the current relay and the protection element; and the second communication unit is connected between the current relay and the gateway.

7. The over-temperature protection circuit according to claim 1, characterized in that: The current detection module includes a Hall element, a signal processing unit and a third communication unit, wherein the Hall element is connected to the switching device; the signal processing unit is connected between the Hall element and the protection element; and the third communication unit is connected between the signal processing unit and the gateway.

8. The over-temperature protection circuit according to claim 1, characterized in that: The temperature control module includes a temperature switch and a temperature fuse.

9. The over-temperature protection circuit according to claim 1, characterized in that: The protection elements include a circuit breaker and a trip coil.

10. A switching power supply, characterized in that: The switching power supply includes the over-temperature protection circuit for a switching device according to any one of claims 1 to 9.

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