Electronic protection device and electric device

Abstract

The utility model discloses an electronic protection device and a power utilization device, and belongs to the field of fuses. The electronic protection device comprises a conductive element used for being connected to a circuit to be tested; the first excitation fuse and the second excitation fuse are connected in series on the conductive element; the arc extinguishing fuse is connected with the second excitation fuse in parallel; and the controller is used for detecting the value of a current flowing through the conductive element of a circuit to be detected, and is in communication connection with the first excitation fuse and the second excitation fuse. The first excitation fuse and the second excitation fuse are connected in series, the arc extinguishing fuse and the second excitation fuse are connected in parallel, and the controller outputs a trigger signal according to the detected current, so that the electronic protection device switches the first working mode or the second working mode, and the circuit can be protected when the circuit is overloaded or short-circuited.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuses, and particularly relates to an electronic protection device and an electric device. BACKGROUND

[0002] A conventional large-capacity fuse is a commonly used energy storage system circuit protection device, which can realize rapid protection of a short-circuit circuit. However, the conventional large-capacity fuse cannot realize overload protection. When an excitation fuse protection circuit is selected, the arc extinguishing effect is poor. When the excitation fuse is used in combination with an arc extinguishing fuse, the arc extinguishing time is relatively long, and the overload protection cannot be realized, and the protection effect is poor. CONTENT OF THE INVENTION

[0003] The application aims to at least solve one of the technical problems in the related art. To this end, the application provides an electronic protection device and an electric device to realize protection of equipment in the case of circuit overload or circuit short circuit.

[0004] In a first aspect, the application provides an electronic protection device, comprising:

[0005] a conductive element configured to be connected to a to-be-detected circuit;

[0006] a first excitation fuse and a second excitation fuse connected in series to the conductive element;

[0007] an arc extinguishing fuse connected in parallel to the second excitation fuse;

[0008] a controller configured to detect a current value of the to-be-detected circuit flowing through the conductive element and communicatively connected to the first excitation fuse and the second excitation fuse.

[0009] According to the electronic protection device of the application, the first excitation fuse and the second excitation fuse are connected in series, the arc extinguishing fuse is connected in parallel to the second excitation fuse, and the controller outputs a trigger signal according to the detected current, so that the electronic protection device switches between a first working mode and a second working mode, thereby protecting the circuit in the case of circuit overload or circuit short circuit.

[0010] According to an embodiment of the application, the controller comprises:

[0011] a current detection unit configured to detect a current value of the to-be-detected circuit;

[0012] a control unit electrically connected to the current detection unit and electrically connected to the first excitation fuse and the second excitation fuse, and configured to control the first excitation fuse or the second excitation fuse based on a signal of the current detection unit.

[0013] According to the electronic protection device, the current detection unit detects the current of the circuit and outputs a signal to the control unit, the control unit compares the signal with a preset current range and outputs a trigger signal to the first excitation fuse or the second excitation fuse, so that the electronic protection device enters the first working mode or the second working mode and protects the circuit.

[0014] According to an embodiment of the present application, the control unit comprises:

[0015] a comparator, which is electrically connected with the current detection unit and is configured to compare the current value of the circuit under test with the first target value and the second target value;

[0016] a processor, which is electrically connected with the comparator and is configured to output a control instruction for controlling the first excitation fuse or the second excitation fuse based on the comparison result.

[0017] According to the electronic protection device, the current detection unit detects the current of the circuit and outputs a signal to the control unit, the control unit compares the signal with a preset current range and outputs a trigger signal to the first excitation fuse or the second excitation fuse, so that the electronic protection device enters the first working mode or the second working mode and protects the circuit.

[0018] According to an embodiment of the present application, in the case of A1≤I≤A2, the electronic protection device is switched to the first working mode, where I is the current of the circuit under test, A1 is the first target value, and A2 is the second target value.

[0019] In the first working mode, the first excitation fuse is triggered.

[0020] According to the electronic protection device, by setting the first target value A1 and the second target value A2, when the current detection unit detects the current value and the comparator compares that the current is between A1 and A2, the processor outputs a trigger signal to make the first excitation fuse work.

[0021] According to an embodiment of the present application, the following conditions are met: 1.8A0≤A1≤2.5A0, and A0 is the overload current of the circuit under test.

[0022] According to the electronic protection device, by setting the first target value A1 to be between 1.8 times the overload current and 2.5 times the overload current, when the current detection unit detects the current value and the comparator compares that the current is between A1 and A2, the processor outputs a trigger signal to make the first excitation fuse work, and the breaking is more accurate.

[0023] According to one embodiment of the present application, when it is determined that I>A2, the electronic protection device cuts into the second working mode, wherein I is the current of the circuit under test, and A2 is the second target value;

[0024] In the second working mode, the second excitation fuse and the arc extinguishing fuse are triggered.

[0025] According to the electronic protection device of the present application, when the current detection unit detects the current value and the comparator compares that the current is greater than A2, the processor outputs a trigger signal to make the second excitation fuse and the arc extinguishing fuse work.

[0026] According to one embodiment of the present application, the controller is connected to the circuit under test between the first excitation fuse and the second excitation fuse.

[0027] According to the electronic protection device of the present application, by connecting the controller to the circuit under test between the first excitation fuse and the second excitation fuse, the electronic protection device is more compact, and the controller is more sensitive and accurate in detecting the current of the circuit.

[0028] According to one embodiment of the present application, the controller is powered by an external power supply;

[0029] Alternatively, the electronic protection device further comprises a built-in power supply, and the built-in power supply powers the controller.

[0030] According to the electronic protection device of the present application, by connecting the controller to the external power supply or the built-in power supply, the controller can work normally when the current of the circuit is overloaded or short-circuited.

[0031] According to one embodiment of the present application, the electronic protection device further comprises:

[0032] a housing;

[0033] The two ends of the conductive element are respectively provided with a first terminal and a second terminal, the first terminal is located at one end of the conductive element close to the first excitation fuse, the second terminal is located at one end of the conductive element close to the second excitation fuse, the first terminal and the second terminal are both connected to the circuit under test through the housing, and the first excitation fuse, the second excitation fuse, the arc extinguishing fuse and the controller are all located in the housing.

[0034] According to the electronic protection device of the present application, the electronic protection device is connected to the circuit under test through the first terminal and the second terminal, and the housing is provided to make the electronic protection device more convenient to use.

[0035] In a second aspect, the present application provides an electric device, which comprises:

[0036] The electronic protection device as described in the above embodiment.

[0037] The power utilization device according to the present application can be rapidly fused when current overload or short circuit occurs, so as to protect the power utilization device from damage by setting the electronic protection device in the power utilization device.

[0038] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0040] Figure 1 is one of the structural schematic diagrams of the electronic protection device provided by the embodiments of the present application;

[0041] Figure 2 is another of the structural schematic diagrams of the electronic protection device provided by the embodiments of the present application;

[0042] Figure 3 is a structural block diagram of the controller provided by the embodiments of the present application;

[0043] Figure 4 is a current transient diagram of the electronic protection device provided by the embodiments of the present application.

[0044] Reference Signs:

[0045] The electronic protection device 100;

[0046] The first excitation fuse 110;

[0047] The second excitation fuse 120;

[0048] The arc extinguishing fuse 130;

[0049] The controller 140, the current detection unit 141, the control unit 142, the comparator 1421, the processor 1422;

[0050] The external power supply 150;

[0051] The first terminal 160;

[0052] The second terminal 170;

[0053] The shell 180;

[0054] The conductive element 190. DETAILED DESCRIPTION

[0055] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as limiting the present application.

[0056] The principle of the electronic protection device 100 proposed in the present application enabling the above beneficial effects is described in detail as follows:

[0057] In the related art, the conventional large-capacity fuse is a commonly used energy storage system circuit protection device. These large-capacity fuses can achieve short-circuit current protection, with a millisecond-level breaking time, and can achieve fast protection of a short-circuit circuit. However, the overload current is relatively small, and the conventional large-capacity fuse cannot act in time under overload conditions, and cannot achieve overload protection. When an excitation fuse protection circuit is selected, the arc extinguishing effect is not good. When an excitation fuse is used in combination with an arc extinguishing fuse, the arc extinguishing time is long when the current is overloaded, and the breaking time is increased, exceeding the circuit overload tolerance time, and still cannot achieve overload protection, with poor protection effect.

[0058] To solve the technical problem, the present application provides an electronic protection device 100, which is described below with reference to Figures 1-4 The electronic protection device 100 according to the embodiments of the present application is described.

[0059] As shown in Figure 1 , the electronic protection device 100 of the embodiments of the present application comprises: a conductive element 190, a first excitation fuse 110, a second excitation fuse 120, an arc extinguishing fuse 130, and a controller 140.

[0060] The conductive element 190 can be a copper bar or the like. The two ends of the conductive element 190 are connected to a circuit to be tested.

[0061] As shown in Figure 1 , the first excitation fuse 110 and the second excitation fuse 120 are both connected in series to the conductive element 190.

[0062] The excitation fuse can be selected from various structures. As an example, the excitation fuse of the present embodiment is selected to be a smoke fire type excitation fuse, which cuts off the circuit by pushing the grid through the explosion of the internal explosive device of the excitation fuse.

[0063] The first excitation fuse 110 and the second excitation fuse 120 both trigger a protection action by receiving a trigger signal, and rapidly cut off the circuit when the circuit is abnormal.

[0064] It should be noted that the circuit abnormality includes circuit overload and circuit short circuit. As shown in Figure 1 , the arc extinguishing fuse 130 is connected in parallel to the second excitation fuse 120.

[0065] Arc-extinguishing fuse 130 is used to extinguish arcs when they occur in a circuit.

[0066] The controller 140 is used to detect the current value flowing through the conductive element 190 of the circuit under test.

[0067] The controller 140 presets a current range and outputs a trigger signal corresponding to the preset current range.

[0068] like Figure 3 As shown, the controller 140 is communicatively connected to the first excitation fuse 110 and the second excitation fuse 120.

[0069] The trigger signal output by the controller 140 is input to the first excitation fuse 110 and the second excitation fuse 120.

[0070] The electronic protection device 100 includes a first operating mode and a second operating mode.

[0071] The first operating mode is used for circuit overload. In the first operating mode, the trigger signal output by the controller 140 is input to the first excitation fuse 110, and the first excitation fuse 110 cuts off the circuit.

[0072] The second operating mode is used for circuit short circuit. In the second operating mode, the trigger signal output by the controller 140 is input to the second excitation fuse 120, the second excitation fuse 120 cuts off the circuit, and the arc extinguishing fuse 130 operates.

[0073] In related technologies, traditional high-capacity fuses are commonly used circuit protection devices for energy storage systems. These high-capacity fuses can achieve short-circuit current protection with a breaking time in the millisecond range, enabling rapid protection of short-circuit circuits. However, the overload current is relatively small, and traditional high-capacity fuses cannot operate in time under overload conditions, thus failing to achieve overload protection. When using excitation fuses to protect the circuit, the arc extinguishing effect is poor. When excitation fuses are used in conjunction with arc-extinguishing fuses, the arc extinguishing time is longer and the breaking time increases under current overload, exceeding the circuit's overload tolerance time, and overload protection still cannot be achieved.

[0074] The electronic protection device 100 of the embodiment, two ends of the conductive element 190 are connected to the circuit to be detected, the first excitation fuse 110 and the second excitation fuse 120 are both connected in series to the conductive element 190, the arc extinguishing fuse 130 is connected in parallel to the second excitation fuse 120, when the controller 140 detects current overload, the electronic protection device 100 enters the first working mode, the controller 140 outputs a trigger signal to the first excitation fuse 110, the first excitation fuse 110 cuts off the circuit, which can quickly protect the overload circuit, when the controller 140 detects short-circuit current, the electronic protection device 100 enters the second working mode, the controller 140 outputs a trigger signal to the second excitation fuse 120, the second excitation fuse 120 cuts off the circuit, at this time, the arc extinguishing fuse 130 is connected to the circuit, the short-circuit current enters the arc extinguishing fuse 130 connected in parallel to the second excitation fuse 120, and the arc extinguishing fuse 130 performs arc extinguishing, which has good arc extinguishing effect while quickly protecting the short-circuit circuit.

[0075] According to the electronic protection device 100 provided by the embodiment of the present application, the first excitation fuse 110 and the second excitation fuse 120 are connected in series, the arc extinguishing fuse 130 is connected in parallel to the second excitation fuse 120, and the controller 140 outputs a trigger signal according to the detected current, so that the electronic protection device 100 switches between the first working mode and the second working mode, and the circuit can be protected in the case of circuit overload or circuit short-circuit.

[0076] In some embodiments, as shown in Figure 1 The first excitation fuse 110, the controller 140 and the second excitation fuse 120 are arranged in sequence along the extension direction of the circuit to be detected, and the arc extinguishing fuse 130 is arranged along a direction intersecting the extension direction of the circuit to be detected.

[0077] It can be understood that, in some embodiments, the first excitation fuse 110, the controller 140 and the second excitation fuse 120 can also be arranged in sequence along the extension direction of the circuit to be detected, with the first excitation fuse 110, the second excitation fuse 120 and the controller 140 arranged in sequence, and the arc extinguishing fuse 130 is arranged along a direction intersecting the extension direction of the circuit to be detected.

[0078] According to the electronic protection device 100 provided by the embodiment of the present application, the first excitation fuse 110, the controller 140, the second excitation fuse 120 and the arc extinguishing fuse 130 are arranged in sequence, so that the circuit can be quickly cut off in the case of circuit abnormality.

[0079] In some embodiments, as shown in Figure 3 The controller 140 can include a current detection unit 141 and a control unit 142.

[0080] The current detection unit 141 is used to detect the current value flowing through the conductive element 190 in the circuit under test.

[0081] The current detection unit 141 can be a Hall effect current sensor, a fluxgate current sensor, a Rokowski current sensor, etc. As an example, a Hall effect current sensor is used in this embodiment.

[0082] like Figure 3 As shown, the control unit 142 is electrically connected to the current detection unit 141, and the control unit 142 is electrically connected to the first excitation fuse 110 and the second excitation fuse 120. The control unit 142 controls the first excitation fuse 110 or the second excitation fuse 120 based on the signal from the current detection unit 141.

[0083] The control unit 142 presets a current range. The control unit 142 is electrically connected to the current detection unit 141. The control unit 142 compares the circuit current detected by the current detection unit 141 with the preset current range. The control unit 142 outputs a trigger signal corresponding to the comparison result.

[0084] like Figure 3 As shown, the control unit 142 is electrically connected to the first excitation fuse 110 and the second excitation fuse 120. The trigger signal output by the control unit 142 is input to the first excitation fuse 110 and the second excitation fuse 120, and the electronic protection device 100 enters the first working mode or the second working mode, and the first excitation fuse 110 or the second excitation fuse 120 works.

[0085] According to the embodiment of this application, the electronic protection device 100 detects the current of the circuit through the current detection unit 141 and outputs a signal to the control unit 142. The control unit 142 compares the signal with a preset current range and outputs a trigger signal to the first excitation fuse 110 or the second excitation fuse 120, so that the electronic protection device 100 enters the first working mode or the second working mode to protect the circuit.

[0086] In some embodiments, such as Figure 3 As shown, the control unit 142 may include a comparator 1421 and a processor 1422.

[0087] Comparator 1421 is electrically connected to current detection unit 141 and is used to compare the current value flowing through conductive element 190 of the circuit under test with the first target value and the second target value.

[0088] It is understood that the first target value and the second target value are the preset current range endpoint values ​​in the above embodiments.

[0089] The processor 1422 is electrically connected to the comparator 1421. The processor 1422 outputs control instructions for controlling the first excitation fuse 110 or the second excitation fuse 120. The control instructions are based on the comparison result of the comparator 1421.

[0090] As an example, the control command in this embodiment is the trigger signal of the first excitation fuse 110 or the second excitation fuse 120.

[0091] Comparator 1421 compares the circuit current with a first target value and a second target value. When the circuit current is less than the first target value, the circuit operates normally. When the circuit current is greater than the first target value and less than the second target value, processor 1422 outputs a control command, and electronic protection device 100 enters the first working mode. When the circuit current is greater than the second target value, processor 1422 outputs a control command, and electronic protection device 100 enters the second working mode.

[0092] According to the embodiment of this application, the electronic protection device 100 compares the current value flowing through the conductive element 190 of the circuit under test with the first target value and the second target value through the comparator 1421, and inputs the comparison result to the processor 1422. The processor 1422 outputs the corresponding control command to the first excitation fuse 110 or the second excitation fuse 120 according to the comparison result, so that the electronic protection device 100 enters the first working mode or the second working mode to protect the circuit.

[0093] In some embodiments, when it is determined that A1≤I≤A2, the electronic protection device 100 can switch to a first operating mode, where I is the current flowing through the conductive element 190 of the circuit under test, A1 is a first target value, and A2 is a second target value.

[0094] As an example, in this embodiment, A1 is set based on the overload current, and A2 is calculated based on the scanning execution time of the Hall effect current sensor, the current detection unit 141, and the current formula.

[0095] like Figure 4 As shown, the current formula is i=Ip(1-e^(-t / τ)), where i is the transient current, Ip is the expected peak current, and τ is the time constant.

[0096] The formula for the time constant is: τ = L / R, where L is the inductance and R is the resistance.

[0097] It should be noted that when the time increases from 0 to the first τ, the current tends to be linear, at which point i = 0.632Ip·t / τ.

[0098] In the first operating mode, the first excitation fuse 110 is triggered.

[0099] The first excitation fuse 110 is triggered to cut off the circuit.

[0100] According to the electronic protection device 100 provided in the embodiments, the first target value A1 and the second target value A2 are set. When the current detection unit 141 detects the current value and the comparator 1421 compares that the current is between A1 and A2, the processor 1422 outputs a trigger signal to make the first excitation fuse 110 work.

[0101] In some embodiments, A1 can satisfy: 1.8A0≤A1≤2.5A0, A0 is the overload current of the circuit to be measured flowing through the conductive element 190.

[0102] A1 can be selected as any current value between 1.8A0 and 2.5A0. For example, in the embodiments, A1 is selected as 2 times the overload current, and A2 is selected as 5KA.

[0103] According to the electronic protection device 100 provided in the embodiments, the first target value A1 is set to be between 1.8 times the overload current and 2.5 times the overload current. When the current detection unit 141 detects the current value and the comparator 1421 compares that the current is between A1 and A2, the processor 1422 outputs a trigger signal to make the first excitation fuse 110 work, and the cut-off is more accurate.

[0104] In some embodiments, the electronic protection device 100 can be switched to the second working mode when it is determined that I>A2, where I is the current of the circuit to be measured flowing through the conductive element 190, and A2 is the second target value.

[0105] For example, in the embodiments, A1 is set based on the overload current, and A2 is calculated according to the Hall effect current sensor, the scanning execution time of the current detection unit 141, and a current formula.

[0106] In the second working mode, the second excitation fuse 120 and the arc-extinguishing fuse 130 are triggered.

[0107] The second excitation fuse 120 is triggered to cut off the circuit, the arc-extinguishing fuse 130 is connected to the circuit, and the arc-extinguishing fuse 130 performs arc extinguishing.

[0108] According to the electronic protection device 100 provided in the embodiments, I>A2 is set in the controller 140. When the current detection unit 141 detects the current value and the comparator 1421 compares that the current is greater than A2, the processor 1422 outputs a trigger signal to make the second excitation fuse 120 and the arc-extinguishing fuse 130 work.

[0109] In some embodiments, as Figure 1As shown, the controller 140 can be connected to the circuit under test between the first excitation fuse 110 and the second excitation fuse 120.

[0110] The controller 140 is connected in series with the first excitation fuse 110 and the second excitation fuse 120 in the circuit under test, and the controller 140 is located between the first excitation fuse 110 and the second excitation fuse 120.

[0111] According to the embodiment of this application, the electronic protection device 100 is more compact in layout by connecting the controller 140 to the circuit under test between the first excitation fuse 110 and the second excitation fuse 120, and the controller 140 is more sensitive and accurate in detecting the circuit current.

[0112] In some embodiments, such as Figure 2 As shown, the controller 140 is powered by an external power supply 150.

[0113] As an example, in this embodiment, the external power source 150 is a battery pack, and the controller of the electronic protection device 100 can be powered by the external power source 150. In this case, the electronic protection device 100 does not include a built-in power source.

[0114] In some embodiments, the electronic protection device 100 may further include a built-in power supply that powers the controller 140.

[0115] In this embodiment, the electronic protection device 100 may also have a built-in power supply. In this case, the electronic protection device 100 includes a built-in power supply, which supplies power to the controller 140.

[0116] According to the electronic protection device 100 provided in the embodiments of this application, by connecting the controller 140 to an external power supply 150 or a built-in power supply, the controller 140 can work normally when the circuit current is overloaded or short-circuited.

[0117] In some embodiments, the electronic protection device 100 may further include: a first terminal 160, a second terminal 170, and a housing 180.

[0118] like Figure 1 and Figure 2 As shown, the conductive element 190 has a first terminal 160 and a second terminal 170 at its two ends. The first terminal 160 is located at the end of the conductive element 190 near the first excitation fuse 110 and is connected to the first excitation fuse 110. The second terminal 170 is located at the end of the conductive element 190 near the second excitation fuse 120 and is connected to the second excitation fuse 120. One end of the first terminal 160 and the second terminal 170 respectively passes through the housing 180 and is connected to the circuit under test.

[0119] The first excitation fuse 110, the second excitation fuse 120, the arc extinguishing fuse 130, and the controller 140 are all located inside the housing 180.

[0120] According to the embodiment of this application, the electronic protection device 100 is connected to the circuit under test through the first terminal 160 and the second terminal 170, and the electronic protection device 100 is made more convenient to use by providing a housing 180.

[0121] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the first excitation fuse 110 and the second excitation fuse 120 are connected in series in the circuit under test, the arc extinguishing fuse 130 is connected in parallel with the second excitation fuse 120, and the controller 140 is communicatively connected to the first excitation fuse 110 and the second excitation fuse 120. The first excitation fuse 110, the controller 140 and the second excitation fuse 120 are arranged sequentially along the extension direction of the circuit under test, and the arc extinguishing fuse 130 and the second excitation fuse 120 are arranged along the direction intersecting with the extension direction of the circuit under test. The electronic protection device 100 includes a first operating mode and a second operating mode. The first operating mode is used for circuit overload, and the second operating mode is used for circuit short circuit.

[0122] In this embodiment, the electronic protection device 100, the controller 140's current detection unit 141 detects the current value of the circuit under test. When the comparison value of the comparator 1421 is between twice the overload current and 5KA, the electronic protection device 100 enters the first working mode, and the processor 1422 outputs a trigger signal to the first excitation fuse 110, which cuts off the circuit. When the controller 140's current detection unit 141 detects the current value of the circuit under test flowing through the conductive element 190, and the comparison value of the comparator 1421 is greater than 5KA, the electronic protection device 100 enters the second working mode, and the processor 1422 outputs a trigger signal to the second excitation fuse 120, which cuts off the circuit. At this time, the arc-extinguishing fuse 130 is connected to the circuit, and the short-circuit current enters the arc-extinguishing fuse 130 connected in parallel with the second excitation fuse 120, which extinguishes the arc.

[0123] According to the embodiment of this application, the electronic protection device 100 is configured by connecting a first excitation fuse 110 and a second excitation fuse 120 in series with the circuit under test, and an arc-extinguishing fuse 130 in parallel with the second excitation fuse 120. The controller 140 detects the current flowing through the conductive element 190 of the circuit under test and compares the current flowing through the conductive element 190 of the circuit under test with a target value, so that the electronic protection device 100 switches to different working modes to protect the equipment when the circuit is overloaded or short-circuited.

[0124] This application also provides an electrical device.

[0125] The electrical device includes: electronic protection device 100.

[0126] The electronic protection device 100 is the electronic protection device 100 described in the above embodiment.

[0127] According to the embodiments of this application, by providing an electronic protection device 100 in the electrical device, it can quickly melt and disconnect in case of current overload or short circuit, thus protecting the electrical device from damage.

[0128] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0129] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0130] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0131] In the description of this application, "multiple" means two or more.

[0132] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0133] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0134] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0135] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic protection device, characterized in that, include: A conductive element used to connect to the circuit under test; A first excitation fuse and a second excitation fuse connected in series with a conductive element; An arc-extinguishing fuse is connected in parallel with the second excitation fuse; The controller is used to detect the current value flowing through the conductive element of the circuit under test, and is communicatively connected to the first excitation fuse and the second excitation fuse.

2. The electronic protection device according to claim 1, characterized in that, The controller includes: A current detection unit is used to detect the current value of the circuit under test; The control unit is electrically connected to the current detection unit and to the first excitation fuse and the second excitation fuse, and is configured to control the first excitation fuse or the second excitation fuse based on the signal from the current detection unit.

3. The electronic protection device according to claim 2, characterized in that, The control unit includes: A comparator, electrically connected to the current detection unit, is used to compare the current value of the circuit under test with a first target value and a second target value. A processor, electrically connected to the comparator, is configured to output a control command for controlling the first excitation fuse or the second excitation fuse based on the comparison result.

4. The electronic protection device according to claim 1, characterized in that, When A1≤I≤A2 is determined, the electronic protection device switches to the first working mode, where I is the current of the circuit under test, A1 is the first target value, and A2 is the second target value. In the first operating mode, the first excitation fuse is triggered.

5. The electronic protection device according to claim 4, characterized in that, The following condition must be met: 1.8A0≤A1≤2.5A0, where A0 is the overload current of the circuit under test.

6. The electronic protection device according to claim 1, characterized in that, When it is determined that I > A2, the electronic protection device switches to the second working mode, where I is the current of the circuit under test and A2 is the second target value. In the second operating mode, the second excitation fuse and the arc-extinguishing fuse are triggered.

7. The electronic protection device according to claim 1, characterized in that, The controller is connected to the circuit under test between the first excitation fuse and the second excitation fuse.

8. The electronic protection device according to any one of claims 1-7, characterized in that, The controller is powered by an external power source; Alternatively, the electronic protection device may also include a built-in power supply that powers the controller.

9. The electronic protection device according to any one of claims 1-7, characterized in that, Also includes: case; The conductive element has a first terminal and a second terminal at its two ends. The first terminal is located at the end of the conductive element near the first excitation fuse, and the second terminal is located at the end of the conductive element near the second excitation fuse. Both the first terminal and the second terminal pass through the housing and are connected to the circuit under test. The first excitation fuse, the second excitation fuse, the arc extinguishing fuse, and the controller are all located inside the housing.

10. An electrical appliance, characterized in that, include: The electronic protection device as described in any one of claims 1-9.

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