Resettable large-current protection device

Abstract

The resettable heavy current protection device comprises a main circuit breaking module and an overload protection module, the overload protection module comprises a box body, a power supply, a control unit, a switch unit and an overload protection unit, the power supply, the control unit and the switch unit are arranged in the box body, the overload protection unit is arranged outside the box body and is connected with the control unit in series, and the overload protection unit is connected with the control unit. The switch unit is connected with the control unit and the power supply. The main circuit break module is electrically connected with the power supply and the control unit. The overload protection module serves as a control circuit of the main circuit breaking module, the overload protection unit is connected to the control unit in series, when the overload protection unit senses temperature, current and voltage abnormities, the overload protection unit is open, and then the control unit controls the main circuit breaking module to be open; only the overload protection unit needs to be replaced, the main circuit breaking module of the main circuit can be continuously used, and therefore the purpose of large-current overload protection is achieved through the small-current overload protection unit.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection devices, in particular to a resettable high-current protection device. Background Art

[0002] An overheat protector is an overheat protection device that cuts off the circuit when the system temperature is abnormal. It is divided into one-time overheat protection and resettable overheat protector. With the rapid development of photovoltaics, energy storage, wind power, new energy vehicles, industry, communications IDC and other fields, overheat protection has gradually become a matter of concern for system projects. Conventional one-time overheat protectors, commonly known as temperature fuses, are made of fusible alloys and lead pins welded together. When the circuit overheats abnormally, the fusible alloy melts and shrinks, thereby disconnecting the circuit once and for all and cannot be reset. However, its breaking capacity is low (the standard stipulates 1.5 times the equal current), especially in high current scenarios above 100A. Moreover, one-time overheat protectors above 100A are very expensive.

[0003] Conventional resettable thermal protectors primarily utilize a bimetallic strip to disconnect the circuit through thermal deformation. Due to their unique structure, the maximum current does not exceed 20A. However, with the rise of fields like energy storage, higher currents, higher interruption rates, and higher voltages are required. Conventional thermal protectors cannot meet these requirements. Therefore, developing a resettable high-current protection device is a pressing technical challenge. Utility Model Content

[0004] The main purpose of the present invention is to overcome the above shortcomings and deficiencies of the prior art and to provide a resettable high current protection device.

[0005] A resettable high-current protection device includes a main circuit breaker module and an overload protection module electrically connected to the main circuit breaker module, the overload protection module includes a box body, a power supply, a control unit, a switch unit and an overload protection unit, the power supply, the control unit and the switch unit are arranged in the box body, the overload protection unit is arranged outside the box body and is connected to the control unit in series, the switch unit is connected to the control unit and the power supply, and the main circuit breaker module is electrically connected to the power supply and the control unit.

[0006] In the utility model, the main circuit breaker module of the main circuit adopts a large-current and high-segmentation circuit breaker, which can carry large current and achieve high breaking rate at the same time. The overload protection module is used as the control circuit of the main circuit breaker module. The overload protection unit is connected to the control unit in series. When the overload protection unit senses abnormal temperature, current, and voltage, the overload protection unit itself opens, and then the control unit controls the main circuit breaker module to open the circuit. Only the overload protection unit needs to be replaced, and the main circuit breaker module of the main circuit can continue to be used, thereby using a small-current overload protection unit to achieve the purpose of large-current overload protection.

[0007] In one embodiment, the box further includes a cover body, which is mounted at the opening of the box body. The switch unit includes a pressing portion, which extends out of the cover body.

[0008] In one embodiment, the number of the overload protection unit is at least one.

[0009] In one embodiment, a mounting groove is provided on the side of the box body, a connecting hole is provided at the bottom of the mounting groove, the overload protection unit includes a connecting member and a sensor, the connecting member is installed in the mounting groove, one end of the connecting member is connected to the control unit through the connecting hole, and the sensor is installed at the other end of the connecting member.

[0010] In one embodiment, the sensor is one or a combination of an overheat sensor, an overcurrent sensor, and an overvoltage sensor.

[0011] In one embodiment, the sensor is an overheating sensor, which is a button-type temperature sensor or a composite temperature sensor.

[0012] In one embodiment, the overheat sensor includes an insulating housing, a first fuse element, a fusible alloy element, a second fuse element, a first electrode, and a second electrode. The insulating housing defines a first axial through-hole, the first fuse element defines a second axial through-hole, and the fusible alloy element defines a receiving space. The first fuse element is disposed within the first axial through-hole, the fusible alloy element is disposed within the second axial through-hole, and the second fuse element is disposed within the receiving space. The first and second electrodes are symmetrically disposed at opposite ends of the first axial through-hole in the insulating housing, and the fusible alloy element is connected to the first and second electrodes at its axial ends, respectively. The cross-sections of the first and second electrodes, taken perpendicular to the axis of the insulating housing, are circular or square. The first and second electrodes are circular sheet-shaped electrodes, and the diameters of the first and second electrodes are no greater than the diameter of the insulating housing.

[0013] In one embodiment, the box body is made of plastic, ceramic, ceramic glass, or a combination thereof. Preferably, the box body is made of ceramic, as a ceramic shell can better sense temperature.

[0014] The resettable high-current protection device of the present invention has the following beneficial effects: the rated current of the overload protection module can be very small, saving costs; the overload protection module does not pass through the main circuit, which can effectively avoid the problem of low breaking; the control circuit composed of the control unit and the overload protection unit can realize active control of the main circuit breaker module; the overload protection module and the main circuit breaker module are integrated into one module, which is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the resettable high current protection device of the utility model;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the resettable high current protection device of the utility model;

[0017] Figure 3 for Figure 1 A schematic structural diagram of the resettable high current protection device of the utility model from another angle;

[0018] Figure 4 for Figure 1 A schematic diagram of a partial structural breakdown of the resettable high current protection device of the utility model;

[0019] Figure 5 for Figure 1 A cross-sectional view of the resettable high current protection device of the utility model;

[0020] Figure 6 This is a cross-sectional view of part of the structure of the resettable high-current protection device of the present invention. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0024] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] The utility model provides a resettable high-current protection device, comprising a main circuit breaker module and an overload protection module electrically connected to the main circuit breaker module, the overload protection module comprising a box body, a power supply, a control unit, a switch unit and an overload protection unit, the power supply, the control unit and the switch unit being arranged within the box body, the overload protection unit being arranged outside the box body and connected to the control unit in series, the switch unit being connected to the control unit and the power supply, and the main circuit breaker module being electrically connected to the power supply and the control unit.

[0027] In the utility model, the main circuit breaker module of the main circuit adopts a large-current and high-segmentation circuit breaker, which can carry large current and achieve high breaking rate at the same time. The overload protection module is used as the control circuit of the main circuit breaker module. The overload protection unit is connected to the control unit in series. When the overload protection unit senses abnormal temperature, current, and voltage, the overload protection unit itself opens, and then the control unit controls the main circuit breaker module to open the circuit. Only the overload protection unit needs to be replaced, and the main circuit breaker module of the main circuit can continue to be used, thereby using a small-current overload protection unit to achieve the purpose of large-current overload protection.

[0028] Example

[0029] See also Figures 1 to 5 The present invention provides a resettable high-current protection device, including a main circuit breaker module 1 and an overload protection module 2 electrically connected to the main circuit breaker module 1. The overload protection module 2 includes a box body 21, a power supply 22, a control unit 23, a switch unit 24, an overload protection unit 25 and a cover body 26. The power supply 22, the control unit 23 and the switch unit 24 are arranged in the box body 21, the overload protection unit 25 is arranged outside the box body 21 and is connected in series with the control unit 23. The switch unit 24 is connected to the control unit 23 and the power supply 22. The main circuit breaker module 1 is electrically connected to the power supply 22 and the control unit 23. The cover body 26 is installed at the opening of the box body 21. The switch unit 24 includes a pressing portion, which extends out of the cover body 26. Preferably, the main circuit breaker module 1 and the overload protection module 2 are integrated into one module for easy installation and use. The number of overload protection units 25 is one or more, and can be distributed at various positions of the device to be protected to achieve precise monitoring and protection.

[0030] In the utility model, the main circuit breaker module of the main circuit adopts a large-current and high-segmentation circuit breaker, which can carry large current and achieve high breaking rate at the same time. The overload protection module is used as the control circuit of the main circuit breaker module. The overload protection unit is connected to the control unit in series. When the overload protection unit senses abnormal temperature, current, and voltage, the overload protection unit itself opens, and then the control unit controls the main circuit breaker module to open the circuit. Only the overload protection unit needs to be replaced, and the main circuit breaker module of the main circuit can continue to be used, thereby using a small-current overload protection unit to achieve the purpose of large-current overload protection.

[0031] More specifically, see Figure 3 、 Figure 4 and Figure 5 The side of the box body 21 is provided with a mounting groove 211, and the bottom of the mounting groove 211 is provided with a connecting hole 212. The overload protection unit 25 includes a connector 251 and a sensor 252. The connector 251 is installed in the mounting groove 211, and one end of the connector 251 is connected to the control unit 23 through the connecting hole 212. The sensor 252 is installed at the other end of the connector 251. Preferably, the sensor is one or a combination of an overheating sensor, an overcurrent sensor, and an overvoltage sensor, which can detect and control overheating, overvoltage, and overcurrent. The utility model uses an overheating sensor as an example for illustration. The overheating sensor is a button-type temperature sensor or a composite temperature sensor.

[0032] More specifically, see Figure 6 The overheating sensor 252 includes an insulating shell 2521, a first fuse element 2522, a fusible alloy element 2523, a second fuse element 2524, a first electrode 2525, and a second electrode 2526. A first axial through hole is defined in the insulating shell 2521. The insulating shell 2521 is a non-conductive layer. The material of the insulating shell 2521 is preferably plastic and is preferably in a ring shape. A second axial through hole is defined on the first fuse element 2522, and a receiving space is defined on the fusible alloy element 2523. The first fuse element 2522 is disposed in the first axial through hole, the fusible alloy element 2523 is disposed in the second axial through hole, and the second fuse element 2524 is disposed in the receiving space. The first electrode 2525 and the second electrode 2526 are symmetrically disposed at both ends of the first axial through hole of the insulating housing 2521, and the axial ends of the fusible alloy element 2523 are connected to the first electrode 2525 and the second electrode 2526, respectively.

[0033] More specifically, the material of the box body 21 is one of plastic, ceramic, ceramic glass, or a combination thereof. Preferably, the material of the box body 21 is ceramic, and the use of a ceramic shell can better sense temperature.

[0034] The resettable high-current protection device of the present invention has the following beneficial effects: the rated current of the overload protection module can be very small, saving costs; the overload protection module does not pass through the main circuit, which can effectively avoid the problem of low breaking; the control circuit composed of the control unit and the overload protection unit can realize active control of the main circuit breaker module; the overload protection module and the main circuit breaker module are integrated into one module, which is easy to install and use.

[0035] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A resettable high current protection device, characterized in that: It includes a main circuit breaker module and an overload protection module electrically connected to the main circuit breaker module, the overload protection module includes a box body, a power supply, a control unit, a switch unit and an overload protection unit, the power supply, the control unit and the switch unit are arranged in the box body, the overload protection unit is arranged outside the box body and is connected to the control unit in series, the switch unit is connected to the control unit and the power supply, and the main circuit breaker module is electrically connected to the power supply and the control unit.

2. A resettable high current protection device according to claim 1, characterized in that: The box body further includes a cover body, which is mounted at the opening of the box body. The switch unit includes a pressing portion, which extends out of the cover body.

3. The resettable high current protection device according to claim 1, characterized in that: A mounting groove is provided on the side of the box body, and a connecting hole is provided at the bottom of the mounting groove. The overload protection unit includes a connecting member and a sensing member. The connecting member is installed in the mounting groove, one end of the connecting member passes through the connecting hole and is connected to the control unit, and the sensing member is installed at the other end of the connecting member.

4. A resettable high current protection device according to claim 3, characterized in that: The sensor is one or a combination of an overheat sensor, an overcurrent sensor, and an overvoltage sensor.

5. The resettable high current protection device according to claim 3, characterized in that: The sensor is an overheating sensor, which is a button-type temperature sensor or a composite temperature sensor.

6. The resettable high current protection device according to claim 5, characterized in that: The overheating sensor includes an insulating shell, a first fuse element, a fusible alloy element, a second fuse element, a first electrode, and a second electrode. The insulating shell is provided with a first axial through hole, the first fuse element is provided with a second axial through hole, and the fusible alloy element is provided with a receiving space. The first fuse element is disposed in the first axial through hole, the fusible alloy element is disposed in the second axial through hole, and the second fuse element is disposed in the receiving space. The first electrode and the second electrode are symmetrically disposed at both ends of the first axial through hole of the insulating shell, and the axial ends of the fusible alloy element are respectively connected to the first electrode and the second electrode.

7. The resettable high current protection device according to claim 1, characterized in that: The material of the box body is one or a combination of plastic, ceramic, and ceramic glass.

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