Electric leakage detection protection device, electric connection equipment and electric appliance

Abstract

The utility model provides an electric leakage detection protection device which comprises a switch module. The electric leakage detection module comprises a first electric leakage detection line and a second electric leakage detection line of which one ends are connected in series, and the electric leakage detection module generates an electric leakage fault signal when the first electric leakage detection line and / or the second electric leakage detection line detects the leakage current signal; the monitoring module is used for detecting whether the first electric leakage detection line and / or the second electric leakage detection line breaks down or not and generating a fault detection signal when the fault occurs; the driving module responds to the electric leakage fault signal and / or the detection fault signal to drive the switch module to disconnect the electric power connection; and the function redundancy module comprises at least one redundancy element which is connected in series or in parallel with at least one element in the monitoring module and / or the driving module, so as to provide the same function as the at least one element when the at least one element fails. According to the utility model, a redundancy function can be provided when part of elements are damaged, and the use safety is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical field especially relates to a leakage detection protection device, electrical connection equipment and electrical apparatus. BACKGROUND

[0002] Leakage detection protection device (hereinafter referred to as "LCDI device") is a kind of electric fire safety protection device, its main structure is the power cord with plug, main function is to detect the leakage current between the power cord fire line, zero line etc. between load electrical appliances (such as air conditioner, dehumidifier) and wire protection layer (shielding), and cut off the power supply of electrical equipment, prevent the generation of fire, to provide safety protection.Therefore, LCDI device can prevent the arc fault fire caused by power cord damage, insulation strength decline due to the aging, wear and tear, extrusion or animal gnawing of fire line (L line), zero line (N line), ground wire.

[0003] The existing LCDI device cannot immediately send an indication signal to remind the user or prevent the user from using when some components are damaged and cause the original function to fail, so there is an electrical safety hazard. INVENTION CONTENTS

[0004] Based on the above problems, the first aspect of the utility model provides a leakage detection protection device, the leakage detection protection device includes: a switch module configured to control the electrical connection between the input end and the output end;A leakage detection module including a first leakage detection line and a second leakage detection line connected in series at one end, the first leakage detection line covers the first current-carrying line and is used to detect the leakage current signal on the first current-carrying line, the second leakage detection line covers the second current-carrying line and is used to detect the leakage current signal on the second current-carrying line, and the leakage detection module is configured to generate a leakage fault signal when the first leakage detection line and / or the second leakage detection line detects the leakage current signal;A monitoring module connected in series with the first leakage detection line and the second leakage detection line and coupled to the first current-carrying line and the second current-carrying line, and configured to detect whether the first leakage detection line and / or the second leakage detection line fails, and generate a detection fault signal when a failure occurs;A drive module coupled to the switch module, the leakage detection module and the monitoring module, and configured to drive the switch module to disconnect the electrical connection in response to the leakage fault signal and / or the detection fault signal;And a functional redundancy module including at least one redundant element, the at least one redundant element is connected in series or parallel with at least one element in the monitoring module and / or the drive module, thereby providing the same function as the at least one element when the at least one element fails.

[0005] In some embodiments, the monitoring module includes a first resistor, one end of which is connected to the first current-carrying line, and the other end of which is connected to the other end of the second leakage current detection line and coupled to the drive module. Furthermore, the at least one redundant element includes a third resistor, which is connected in parallel with the first resistor.

[0006] In some embodiments, the monitoring module includes a second resistor, one end of which is connected to the other end of the first leakage current detection line, and the other end of which is coupled to the drive module. Furthermore, the at least one redundant element includes a fourth resistor connected in parallel with the second resistor.

[0007] In some embodiments, the drive module includes: a solenoid that generates an electromagnetic force for driving the switch module; and at least one semiconductor element connected in series with the solenoid, which causes the solenoid to generate the electromagnetic force under the action of the leakage fault signal and / or the detection fault signal.

[0008] In some embodiments, the driving module further includes a first diode, the anode of which is connected to the cathode of the at least one semiconductor element, the cathode of which is connected to the first current-carrying line, and the at least one redundant element includes a third diode connected in parallel with the first diode.

[0009] In some embodiments, the drive module further includes a second diode, the anode of which is connected to the cathode of the at least one semiconductor element, the cathode of which is connected to the solenoid, and the at least one redundant element includes a fourth diode, which is connected in parallel with the second diode.

[0010] In some embodiments, the driving module further includes a first capacitor and a first Zener diode. The anode of the first Zener diode is connected to the control electrode of the at least one semiconductor element, and its cathode is coupled to the leakage detection module and the monitoring module. The two ends of the first capacitor are respectively connected to the cathode of the at least one semiconductor element and the cathode of the first Zener diode. The at least one redundant element includes: a third capacitor connected in series or in parallel with the first capacitor; and / or a second Zener diode connected in series or in parallel with the first Zener diode.

[0011] In some embodiments, the driving module further includes a fifth resistor, one end of which is connected to the cathode of the first Zener diode and one end of the first capacitor, and the other end is coupled to the monitoring module. In addition, the at least one redundant element includes a sixth resistor, which is connected in series or in parallel with the fifth resistor.

[0012] In some embodiments, the drive module further comprises a second capacitor connected across the cathode and the control electrode of the at least one semiconductor element, and the at least one redundant element comprises a fourth capacitor connected in series with the second capacitor.

[0013] The second aspect of the utility model provides a kind of electric connection equipment, the electric connection equipment includes: shell;And the leakage detection protection device according to any one of each embodiment of the first aspect, the leakage detection protection device is housed in the shell.

[0014] The third aspect of the utility model provides a kind of electric appliance, the electric appliance includes: load equipment;And the electric connection equipment according to any one of each embodiment of the second aspect, it is coupled to the load equipment, for supplying power to the load equipment.

[0015] In the utility model, leakage detection protection device includes functional redundancy module, it can provide redundancy function for at least one element in monitoring module and / or drive module, to provide the same function with at least one element when it fails, so that product continues to use or prevents user to use, ensure the security of use, eliminate potential safety hazard.In addition, the circuit structure of leakage detection protection device provided by the utility model is simple, low in cost and high in safety. BRIEF DESCRIPTION OF DRAWINGS

[0016] Embodiments are illustrated by and described in conjunction with the drawings. These drawings are for purposes of illustrating the basic principles involved and as such are not necessarily drawn to scale. In the drawings, the same reference numbers are used to represent similar components. In addition, the connection between each block in the architecture diagram represents that the two blocks are electrically coupled, and there is no connection between the two blocks, which does not mean that the two blocks are not coupled.

[0017] Figure 1 An architecture diagram of a leakage detection protection device according to an embodiment of the utility model is shown;

[0018] Figure 2 A schematic diagram of a first embodiment of a leakage detection protection device according to the utility model is shown;

[0019] Figure 3 A schematic diagram of a second embodiment of a leakage detection protection device according to the utility model is shown;

[0020] Figure 4 A schematic diagram of a third embodiment of a leakage detection protection device according to the utility model is shown;

[0021] Figure 5 A schematic diagram of a fourth embodiment of a leakage detection protection device according to the utility model is shown;

[0022] Figure 6 The principle diagram of the fifth embodiment of the electric leakage detection protection device according to the utility model is shown. DETAILED DESCRIPTION

[0023] In the following detailed description of the preferred embodiments, reference will be made to the accompanying drawings, which form a part of this utility model. The accompanying drawings illustrate specific embodiments in which the utility model can be practiced by way of example. The example embodiments are not intended to limit the scope of the utility model, as claimed. It is understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the utility model. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the utility model is defined by the appended claims.

[0024] Before introducing the embodiments of the utility model, first, the terms involved in the utility model are explained, so as to better understand the utility model.

[0025] The terms "connect", "couple" or "couple" and similar terms used in the utility model are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "One", "a group" or "one" and similar words do not represent quantity limitation, but represent the existence of at least one.

[0026] The terms "include", "contain" and similar terms used in the utility model should be understood as open terms, namely "include / contain but not limited to", which means that other contents can also be included. The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment" and so on. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0027] The utility model aims at providing an electric leakage detection protection device. The device includes a function redundancy module, which can provide redundancy function for at least one element in the monitoring module and / or driving module, so as to provide the same function as the at least one element when it fails, so that the product continues to use or prevents the user from using, ensures the safety of use, eliminates potential safety hazards. In addition, the electric leakage detection protection device provided by the utility model has simple circuit structure, low cost and high safety.

[0028] Figure 1 A schematic diagram of a leakage current detection and protection device according to an embodiment of the present invention is shown.

[0029] like Figure 1 As shown, the leakage current detection and protection device 100 includes a switching module 103, a leakage current detection module 104, a monitoring module 105, a drive module 106, and a functional redundancy module 107. The switching module 103 controls the power connection between the input terminal 101 and the output terminal 102 of the power line. The leakage current detection module 104 includes a first leakage current detection line and a second leakage current detection line connected in series at one end. The first leakage current detection line covers a first current-carrying line in the power line and detects the leakage current signal on the first current-carrying line. The second leakage current detection line covers a second current-carrying line in the power line and detects the leakage current signal on the second current-carrying line. When the leakage current detection module 104 detects a leakage current signal on the first leakage current detection line and / or the second leakage current detection line, it generates a leakage fault signal. The monitoring module 105 is connected in series with the first and second leakage current detection lines and coupled to the first and second current-carrying lines, and detects whether a fault has occurred in the first and / or second leakage current detection lines, generating a detection fault signal when a fault occurs. The drive module is coupled to the switch module 103, the leakage current detection module 104, and the monitoring module 105, and drives the switch module 103 to disconnect the power connection in response to a leakage current fault signal and / or a detection fault signal. The functional redundancy module 107 includes at least one redundant element. This at least one redundant element is connected in series or in parallel with at least one element in the monitoring module 105 and / or the drive module 106, thereby providing the same function as the at least one element in the event of a failure of the at least one element.

[0030] The series or parallel connection of the redundant element and the at least one element can be determined by determining whether the at least one element will bring a safety hazard to the user when a short-circuit fault or an open-circuit fault occurs. For example, if a certain element will bring a safety hazard to the user when a short-circuit fault occurs, the redundant element is connected in series with the element to avoid the safety hazard. Similarly, if a certain element will bring a safety hazard to the user when an open-circuit fault occurs, the redundant element is connected in parallel with the element to avoid the safety hazard. If a certain element will bring a safety hazard to the user when a short-circuit fault or an open-circuit fault occurs, two redundant elements can be provided, which are connected in series and in parallel with the element respectively, or the series or parallel connection of the redundant element and the element can be determined according to the possibility of the short-circuit fault or the open-circuit fault of the element, so that the safety hazard can be avoided, and the size of the leakage protection device and the cost can be reduced. Each element and the redundant element connected in series or in parallel with the element are in a corresponding relationship, which can be one or more of a resistor, a capacitor, an inductor, a diode, a zener diode, a semiconductor element, etc. Each element and the redundant element connected in series or in parallel with the element can be the same type of element, for example, both are resistors, capacitors, diodes or zener diodes, or can be different types of elements, as long as the redundant element provides the same function as the corresponding element (i.e., the element connected in series or in parallel with the element).

[0031] In the leakage detection protection device 100, since the functional redundancy module 107 includes at least one redundant element, the functional redundancy module 107 can provide a redundant function for at least one element in the monitoring module 105 and / or the driving module 106, so that the same function as the at least one element is provided when the at least one element fails, the product continues to be used or the user is prevented from using, the safety of use is ensured, and the potential safety hazard is eliminated.

[0032] Figure 2 A schematic diagram of a first embodiment of a leakage detection protection device according to the present application is shown. As shown in Figure 2 The leakage detection protection device 200 includes a switch module 103, a leakage detection module 104, a monitoring module 105, a driving module 106 and a functional redundancy module 107. As shown in Figure 2As shown, the switch module 103 includes a reset switch (RESET) for controlling the power connection between the input terminal LINE and the output terminal LOAD of the power line. The power line includes a first current-carrying line 11 (live wire), a second current-carrying line 12 (neutral wire), and a third current-carrying line 13 (ground wire). The leakage current detection module 104 includes a first leakage current detection line 141 and a second leakage current detection line 142. The first leakage current detection line 141 covers the first current-carrying line 11 and is used to detect the leakage current signal on the first current-carrying line 11, and the second leakage current detection line 142 covers the second current-carrying line 12 and is used to detect the leakage current signal on the second current-carrying line 12.

[0033] like Figure 2 As shown, one end of the first leakage current detection line 141 and the second leakage current detection line 142 are connected in series. The monitoring module 105 includes resistors R5 (first resistor) and R6 (second resistor) for detecting whether the first leakage current detection line 141 and / or the second leakage current detection line 142 has failed, and generating a fault detection signal when a fault occurs. One end of resistor R5 is connected to the first current-carrying line 11, the reset switch RESET, and the test switch TEST, and its other end is connected to the other end of the second leakage current detection line 142 and one end of resistor R2 (fifth resistor) in the drive module 106, forming connection point A. One end of resistor R6 is connected to the other end of the first leakage current detection line 141 and resistor R3, and its other end is connected to one end of capacitor C1 (first capacitor) in the drive module 106. The redundancy function module 107 includes resistor R5_1 (third resistor) connected in series with resistor R5.

[0034] In addition to resistor R2 and capacitor C1, drive module 106 also includes solenoid SOL1, silicon controlled rectifier (SCR) (semiconductor element), diode D1 (first diode), diode D2 (second diode), capacitor C2 (second capacitor), resistor R4, and Zener diode ZD1 (first Zener diode). In drive module 106, the anodes of diodes D1 and D2 are connected to the cathode of the SCR; the cathode of diode D1 is connected to the first current-carrying line 11 and the reset switch RESET; and the cathode of diode D2 is connected to one end of solenoid SOL1. The anode of Zener diode ZD1 is connected to the control electrode of the SCR, and its cathode is connected to the other end of resistor R2. The two ends of capacitor C1 are connected to the cathode of Zener diode ZD1 and the cathode of the SCR, respectively. The two ends of capacitor C2 and resistor R4 are connected to the control electrode and cathode of the SCR, respectively. The anode of the SCR is also connected to one end of solenoid SOL1. The other end of solenoid SOL1 is connected to the second current-carrying line 12 and the reset switch RESET. Solenoid SOL1 is used to generate the electromagnetic force driving the switching module 103. The silicon controlled rectifier (SCR) causes solenoid SOL1 to generate the electromagnetic force under the action of a leakage fault signal and / or a detection fault signal.

[0035] When the first leakage detection line 141 and the second leakage detection line 142 are both working normally (not open circuit), the current of the first current-carrying line 11 flows through the circuit of R5-the second leakage detection line 142-the first leakage detection line 141-R6-D2-SOL1 to the second current-carrying line 12. By setting the resistance values of R5 and R6, the potential of point A is limited to a lower potential, which is lower than the threshold voltage of the ZD1, so that the voltage of the control electrode of the SCR is limited to a very low level, which is not enough to trigger the SCR to conduct and cause the electromagnetic force in the solenoid SOL1. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

[0036] When the first current-carrying line 11 and / or the second current-carrying line 12 generates a leakage current signal, the potential of point A rises, and the SCR is triggered to conduct through the first current-carrying line 11-the first leakage detection line 141-the second leakage detection line 142-R2-ZD1. The second current-carrying line 12-SOL1-SCR-D1-first current-carrying line 11 forms a current loop, a larger current is generated in the solenoid SOL1, a large enough magnetic field is formed to drive the reset switch RESET of the switch module 103 to open, thereby cutting off the power connection between the input LINE and the output LOAD. Therefore, the device can detect the leakage current signal on the first current-carrying line 12 and the second current-carrying line 12.

[0037] When the first leakage detection line 141 and / or the second leakage detection line 142 has an open circuit fault, the resistance R6 loses the voltage dividing function, the potential of point A rises, the SCR is triggered to conduct through the first current-carrying line 11-R5-R2-ZD1, a larger current is generated in the solenoid SOL1, a large enough magnetic field is formed to drive the reset switch RESET of the switch module 103 to open, thereby cutting off the power connection between the input LINE and the output LOAD. Therefore, the device can detect whether the first leakage detection line 141 and / or the second leakage detection line 142 has an open circuit fault.

[0038] Without the functional redundancy module 107, an open-circuit fault in resistor R5 would pose a safety hazard to the user. Specifically, when the first current-carrying line 11 and / or the second current-carrying line 12 generates a leakage current signal, point A will remain at a low potential, failing to trigger the SCR to conduct. Consequently, solenoid SOL1 cannot drive the reset switch RESET of switch module 103 to open, maintaining a power connection between input terminal LINE and output terminal LOAD. Similarly, when an open-circuit fault occurs in the first leakage detection line 141 and / or the second leakage detection line 142, point A will also remain at a low potential, failing to trigger the SCR to conduct, and maintaining a power connection between input terminal LINE and output terminal LOAD. In other words, the leakage detection device 200 loses its function of leakage protection or detecting whether an open-circuit fault has occurred in the leakage detection line.

[0039] In this embodiment, a functional redundancy module 107 is provided, which includes a resistor R5_1 (the third resistor) connected in parallel with resistor R5. By adjusting the parameters of resistors R5 and R5_1, the leakage current detection and protection device 200 can operate normally when resistor R5 is not faulty. When resistor R5 experiences an open-circuit fault, resistor R5_1 connected in parallel with it still operates normally, thus providing redundancy for resistor R5. When the first current-carrying line 11 and / or the second current-carrying line 12 generates a leakage current signal, or when the first leakage current detection line 141 and / or the second leakage current detection line 142 experiences an open-circuit fault, the potential at point A rises, triggering the SCR to conduct through the first current-carrying line 11-R5_1-R2-ZD1, causing the solenoid SOL1 to drive the switch module 103 to disconnect, cutting off the power connection between the input terminal LINE and the output terminal LOAD, thus eliminating potential safety hazards.

[0040] Similarly, an open-circuit fault in resistor R6 would also pose a safety hazard to the user. Therefore, in other embodiments, a redundant resistor (a fourth resistor) connected in parallel with resistor R6 can be provided to provide redundancy for resistor R6. Depending on the actual situation (such as the probability of open-circuit faults in resistors R5 and R6), the functional redundancy module 107 can be configured to include only the redundant resistor for resistor R6, or it can include both the redundant resistor for resistor R6 and resistor R5_1.

[0041] Figure 3 A schematic diagram of a second embodiment of the leakage current detection and protection device according to the present invention is shown. Figure 2 Compared to the previous embodiment, the main difference lies in the functional redundancy module 107. Figure 3 In one embodiment, the functional redundancy module 107 includes a resistor R5_1 connected in parallel with the resistor R5 and a capacitor C1_1 (the third capacitor) connected in series with the capacitor C1.

[0042] When all elements are working properly, the working principle of the leakage detection protection device 300 is the same as that of the leakage detection protection device 200, which will not be described here again. When the resistance R5 breaks down, the redundancy function can also be provided by the resistance R5_1.

[0043] When the capacitor C1 short-circuits without the capacitor C1_1, it will bring potential safety hazards to the user. Specifically, when the first current-carrying line 11 and / or the second current-carrying line 12 generates a leakage current signal, or when the first leakage detection line 141 and / or the second leakage detection line 142 breaks down, the capacitor C1 cannot provide the charging and discharging function, and thus cannot trigger the silicon controlled rectifier SCR to conduct, and the solenoid SOL1 cannot drive the reset switch RESET of the switch module 103 to break, so that the power connection between the input end LINE and the output end LOAD is maintained.

[0044] In this embodiment, the functional redundancy module 107 further includes a capacitor C1_1 connected in series with the capacitor C1. By adjusting the parameters of the capacitors C1 and C1_1, the leakage detection protection device 300 can work normally when the capacitor C1 does not break down. When the capacitor C1 short-circuits, the capacitor C1_1 connected in series with it still works normally, and thus can provide redundancy for the capacitor C1. When the first current-carrying line 11 and / or the second current-carrying line 12 generates a leakage current signal, or when the first leakage detection line 141 and / or the second leakage detection line 142 breaks down, the silicon controlled rectifier SCR can be triggered to conduct, so that the solenoid SOL1 drives the switch module 103 to break, cutting off the power connection between the input end LINE and the output end LOAD, and eliminating the potential safety hazards.

[0045] Similarly, the breakdown of the capacitor C1 will also bring potential safety hazards to the user. Therefore, in other embodiments, the capacitor C1_1 can be connected in parallel with the capacitor C1 to provide redundancy for the capacitor C1. Depending on the actual situation (e.g., the possibility of short-circuit or breakdown of the capacitors C1 and C2), the capacitor C1_1 can be connected in series or in parallel with the capacitor C1. Of course, two redundant capacitors can also be provided for the capacitor C1, one of which is connected in series with the capacitor C1, and the other of which is connected in parallel with the capacitor C1.

[0046] Similarly, the short-circuit of the capacitor C2 will also bring potential safety hazards to the user. Therefore, in other embodiments, a redundant capacitor (fourth capacitor) connected in series with the capacitor C2 can be provided to provide redundancy for the capacitor C2. Depending on the actual situation (e.g., the possibility of short-circuit or breakdown of the capacitors C1 and C2), the functional redundancy module 107 can be configured to include only the capacitor C1_1, or both the capacitor C1_1 and the redundant capacitor of the capacitor C2.

[0047] Similarly, the short circuit failure or open circuit failure of the Zener diode ZD1 also brings potential safety hazard to the user. Therefore, in other embodiments, a redundant Zener diode (second Zener diode) connected in series or in parallel with the Zener diode ZD1 can be provided to provide redundancy for the Zener diode ZD1. The redundant Zener diode can be connected in series or in parallel with the Zener diode ZD1 according to actual conditions (such as the possibility of short circuit failure or open circuit failure of the Zener diode ZD1). Of course, two redundant Zener diodes can also be provided for the Zener diode ZD1, one of which is connected in series with the Zener diode ZD1 and the other of which is connected in parallel with the Zener diode ZD1.

[0048] Figure 4 A principle diagram of a third embodiment of the leakage detection protection device according to the present application is shown. Compared with the embodiment of Figure 2 The main difference is the functional redundancy module 107. In the embodiment of Figure 4 The functional redundancy module 107 includes a resistor R5_1 connected in parallel with the resistor R5 and a resistor R2_1 (sixth resistor) connected in series with the resistor R2.

[0049] In the case where all elements are working normally, the working principle of the leakage detection protection device 400 is the same as that of the leakage detection protection device 200, which will not be described here again. When the resistor R5 fails in open circuit, the redundant function can also be provided by the resistor R5_1.

[0050] In the case where the resistor R2_1 is not provided, the short circuit of the resistor R2 brings potential safety hazard to the user. Specifically, when the first current-carrying line 11 or the second current-carrying line 12 generates a leakage current signal, the excessive loop current can burn the capacitor C1, the Zener diode ZD1 or the diode D1, resulting in that the leakage detection protection device 400 cannot work, which brings potential safety hazard to the user.

[0051] In the present embodiment, the functional redundancy module 107 further includes a resistor R2_1 connected in series with the resistor R2. By adjusting the parameters of the resistors R2 and R2_1, the leakage detection protection device 400 can work normally when the resistor R2 does not fail. When the resistor R2 fails in short circuit, the resistor R2_1 connected in series with the resistor R2 still works normally, thus providing redundancy for the resistor R2. When the first current-carrying line 11 or the second current-carrying line 12 generates a leakage current signal, the resistor R2_1 can ensure that the loop current is not too large, so that the driving module 107 works normally, cuts off the power connection between the input end LINE and the output end LOAD, and eliminates the potential safety hazard.

[0052] Similarly, the disconnection of the resistor R2 will cause the SCR to fail to trigger, and will also bring safety hazards to the user. Therefore, in other embodiments, the resistor R2_1 can be connected in parallel with the resistor R2 to provide redundancy for the resistor R2. The resistor R2_1 can be connected in series or in parallel with the resistor R2 according to the actual situation (such as the possibility of disconnection and short-circuit failure of the resistor R2). Of course, two redundant resistors can also be provided for the resistor R2, one of which is connected in series with the resistor R2, and the other is connected in parallel with the resistor R2.

[0053] Figure 5 The principle diagram of the fourth embodiment of the leakage detection protection device according to the utility model is shown. Compared with the embodiment of the utility model, Figure 2 The main difference is the functional redundancy module 107. In the embodiment of the utility model, Figure 5 The functional redundancy module 107 includes the resistor R5_1 connected in parallel with the resistor R5, the diode D1_1 (the third diode) connected in parallel with the diode D1, and the diode D2_1 (the fourth diode) connected in parallel with the diode D2.

[0054] In the case that all elements are working normally, the working principle of the leakage detection protection device 500 is the same as that of the leakage detection protection device 200, which will not be repeated here. When the resistor R5 is disconnected, the resistor R5_1 can also provide redundancy.

[0055] In the case that the capacitors D1_1 and D1_2 are not provided, the disconnection of the capacitor D1 or D2 will bring safety hazards to the user. Specifically, if the capacitor D1 is disconnected, when the leakage current signal is generated on the first current-carrying line 11 or the second current-carrying line 12, or when the first leakage detection line 141 and / or the second leakage detection line 142 is disconnected, although the SCR can be triggered to conduct, the current loop cannot be formed, and the solenoid SOL1 cannot drive the reset switch RESET of the switch module 103 to open, and the input end LINE and the output end LOAD remain connected in power. If the capacitor D2 is disconnected, when the leakage current signal is generated on the first current-carrying line 11, or when the first leakage detection line 141 and / or the second leakage detection line 142 is disconnected, the reset switch RESET of the switch module 103 cannot be driven to open, and the input end LINE and the output end LOAD remain connected in power.

[0056] In this embodiment, the functional redundancy module 107 also includes diode D1_1 connected in parallel with diode D1 and diode D2_1 connected in parallel with diode D2. When diodes D1 and / or D2 experience an open-circuit fault, diodes D1_1 and / or D2_1 connected in parallel with them still operate normally, thus providing redundancy for diodes D1 and D2. When a leakage current signal is generated on the first current-carrying line 11 and / or the second current-carrying line 12, or when an open-circuit fault occurs on the first leakage detection line 141 and / or the second leakage detection line 142, the SCR can be triggered to conduct, causing the solenoid SOL1 to drive the switch module 103 to disconnect, cutting off the power connection between the input terminal LINE and the output terminal LOAD, thus eliminating potential safety hazards.

[0057] Figure 6 A schematic diagram of a fifth embodiment of a leakage current detection and protection device according to the present invention is shown. Figure 2 Compared to the previous embodiment, the main difference lies in the functional redundancy module 107. Figure 6 In the embodiment, the functional redundancy module 107 includes a resistor R5_1 connected in parallel with resistor R5, a resistor R6_1 connected in parallel with resistor R6, a resistor R2_1 connected in parallel with resistor R2, a resistor R4_1 connected in series with resistor R4, a Zener diode ZD1_1 connected in parallel with Zener diode ZD1, a capacitor C1_1 connected in series with capacitor C1, a capacitor C2_2 connected in series with capacitor C2, a diode D1_1 connected in parallel with diode D1, and a diode D2_1 connected in parallel with diode D2.

[0058] Referring to the description above, resistors R5_1, R6_1, R2_1, R4_1, Zener diode ZD1_1, capacitors C1_1, C2_2, and diodes D1_1 and D2_1 provide redundancy for resistors R5, R6, R2, R4, Zener diode ZD1, capacitors C1, C2, and diodes D1 and D2, respectively. In the event of a short circuit or open circuit fault in one or more of these components, the corresponding redundant components will continue to function normally, thus eliminating potential safety hazards for the user.

[0059] A second aspect of this invention provides an electrical connection device comprising: a housing; and a leakage current detection and protection device according to any of the above embodiments, the leakage current detection and protection device being housed within the housing.

[0060] A third aspect of this utility model provides an electrical appliance, comprising: a load device; and an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device includes a leakage current detection and protection device of any of the above embodiments.

[0061] Therefore, although the present invention has been described with reference to specific examples, which are intended to be exemplary only and not to limit the present invention, it will be apparent to those skilled in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the present invention.

Claims

1. A leakage current detection and protection device, characterized in that, The leakage current detection and protection device includes: A switching module configured to control the electrical connection between the input and output terminals; A leakage current detection module includes a first leakage current detection line and a second leakage current detection line connected in series at one end. The first leakage current detection line covers a first current-carrying line and is used to detect the leakage current signal on the first current-carrying line. The second leakage current detection line covers a second current-carrying line and is used to detect the leakage current signal on the second current-carrying line. The leakage current detection module is configured to generate a leakage current fault signal when the first leakage current detection line and / or the second leakage current detection line detects the leakage current signal. A monitoring module is connected in series with the first leakage current detection line and the second leakage current detection line and coupled to the first current-carrying line and the second current-carrying line, and is configured to detect whether the first leakage current detection line and / or the second leakage current detection line has failed, and generate a fault detection signal when a fault occurs; A drive module, coupled to the switch module, the leakage current detection module, and the monitoring module, and configured to drive the switch module to disconnect the power connection in response to the leakage current fault signal and / or the detection fault signal; and A functional redundancy module includes at least one redundant element, which is connected in series or in parallel with at least one element in the monitoring module and / or the drive module, thereby providing the same function as the at least one element when the at least one element fails.

2. The leakage current detection and protection device according to claim 1, characterized in that, The monitoring module includes a first resistor, one end of which is connected to the first current-carrying line, and the other end of which is connected to the other end of the second leakage current detection line and coupled to the drive module. The at least one redundant component includes a third resistor, which is connected in parallel with the first resistor.

3. The leakage current detection and protection device according to claim 1 or 2, characterized in that, The monitoring module includes a second resistor, one end of which is connected to the other end of the first leakage current detection line, and the other end of which is coupled to the drive module. The at least one redundant element includes a fourth resistor, which is connected in parallel with the second resistor.

4. The leakage current detection and protection device according to claim 1, characterized in that, The driving module includes: A solenoid that generates an electromagnetic force for driving the switching module; and At least one semiconductor element is connected in series with the solenoid and causes the solenoid to generate the electromagnetic force under the action of the leakage fault signal and / or the detection fault signal.

5. The leakage current detection and protection device according to claim 4, characterized in that, The driving module further includes a first diode, the anode of which is connected to the cathode of the at least one semiconductor element, and the cathode is connected to the first current-carrying line. The at least one redundant element includes a third diode, which is connected in parallel with the first diode.

6. The leakage current detection and protection device according to claim 4 or 5, characterized in that, The drive module further includes a second diode, the anode of which is connected to the cathode of the at least one semiconductor element, the cathode of which is connected to the solenoid, and the at least one redundant element includes a fourth diode, which is connected in parallel with the second diode.

7. The leakage current detection and protection device according to claim 4, characterized in that, The driving module further includes a first capacitor and a first Zener diode. The anode of the first Zener diode is connected to the control electrode of the at least one semiconductor element, and its cathode is coupled to the leakage detection module and the monitoring module. The two ends of the first capacitor are respectively connected to the cathode of the at least one semiconductor element and the cathode of the first Zener diode. Furthermore, the at least one redundant element includes: A third capacitor, which is connected in series or in parallel with the first capacitor; and / or The second Zener diode is connected in series or in parallel with the first Zener diode.

8. The leakage current detection and protection device according to claim 7, characterized in that, The driving module further includes a fifth resistor, one end of which is connected to the cathode of the first Zener diode and one end of the first capacitor, and the other end is coupled to the monitoring module. In addition, the at least one redundant element includes a sixth resistor, which is connected in series or in parallel with the fifth resistor.

9. The leakage current detection and protection device according to claim 4, characterized in that, The drive module further includes a second capacitor, the two ends of which are respectively connected to the cathode and control electrode of the at least one semiconductor element, and the at least one redundant element includes a fourth capacitor, which is connected in series with the second capacitor.

10. An electrical connection device, characterized in that, The electrical connection device includes: Casing; and The leakage current detection and protection device according to any one of claims 1-9, wherein the leakage current detection and protection device is housed in the housing.

11. An electrical appliance, characterized in that, The electrical appliances include: Load devices; and The electrical connection device according to claim 10 is coupled to the load device for supplying power to the load device.

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