Leakage protection device, electrical connection device and electrical appliance

Abstract

The present disclosure provides a leakage protection device, comprising: a leakage current detection module configured to detect a leakage current signal on a power supply line and generate a detection feedback signal when the leakage current signal is detected; a self-checking module configured to detect whether the leakage current detection module fails, the self-checking module comprising: an analog leakage triggering module configured to generate an analog leakage triggering signal; an analog leakage current generating module configured to generate an analog leakage current signal upon triggering by the analog leakage triggering signal, which is used to simulate the leakage current signal; a triggering signal closing module configured to close the analog leakage triggering signal under the action of the detection feedback signal; and a fault signal generating module coupled to the analog leakage triggering module and configured to generate a self-checking fault signal when the leakage current detection module fails; and a tripping module configured to disconnect the power connection on the power supply line under the action of the self-checking fault signal. The self-checking module in the present disclosure is simple, reliable and low in cost.

Description

Technical Field

[0001] The present disclosure belongs to the electrical field, and particularly relates to a leakage protection device, an electrical connection device, and an electrical appliance with a self-check function. Background Art

[0002] Currently, more and more household or industrial electrical appliances are adopted in various fields. For electrical safety, people usually install leakage protectors at the grid output end or at the input end of some household electrical appliances, and there is a conspicuous label saying "Test before use" to urge users to test whether the leakage protection function of the leakage protector is normal. However, in use, due to different usage environments or installation factors, even if people perform the operation of testing the leakage protector before use, the leakage protector still has the possibility of losing the leakage protection function during use, thus leading to dangerous situations.

[0003] For the above reasons, leakage protection devices that simultaneously have leakage detection and self-check functions have been designed currently. However, most of the self-check circuits in these devices use integrated circuits to implement the self-check function, and their peripheral circuits are relatively complex, and the cost is also relatively high. Summary of the Invention

[0004] Based on the above problems, the present disclosure proposes a leakage protection device, which includes a self-check circuit implemented by discrete components, with a simple circuit and low cost.

[0005] A first aspect of the present disclosure proposes a leakage protection device, including: a leakage current detection module configured to detect a leakage current signal on a power supply line and generate a detection feedback signal when the leakage current signal is detected; a self-check module configured to detect whether the leakage current detection module fails, the self-check module including: an analog leakage triggering module configured to generate an analog leakage triggering signal; an analog leakage current generation module configured to generate an analog leakage current signal triggered by the analog leakage triggering signal, which is used to simulate the leakage current signal; a trigger signal shutdown module configured to shut down the analog leakage triggering signal under the action of the detection feedback signal; and a fault signal generation module coupled to the analog leakage triggering module and configured to generate a self-check fault signal when the leakage current detection module fails; and a tripping module configured to disconnect the electrical connection on the power supply line under the action of the self-check fault signal.

[0006] In a preferred embodiment, the analog leakage triggering module, the analog leakage current generation module, the trigger signal shutdown module, and the fault signal generation module are all composed of discrete electronic components.

[0007] In a preferred embodiment, the analog leakage trigger module includes: a trigger tube that generates the analog leakage trigger signal when conducting; a delay module that is coupled to the trigger tube and controls the conduction of the trigger tube, thereby controlling the interval time for generating the analog leakage trigger signal.

[0008] In a preferred embodiment, the delay module includes a first resistor and a first capacitor connected in series, and the trigger signal shutdown module includes a first semiconductor element. The detection feedback signal is used to control the conduction of the first semiconductor element to provide a discharge path for the charge on the first capacitor, thereby shutting down the analog leakage trigger signal.

[0009] In a preferred embodiment, the analog leakage current generation module includes a second resistor that is coupled to the trigger tube. When the trigger tube conducts, the analog leakage current signal flows through the second resistor.

[0010] In a preferred embodiment, the analog leakage current generation module includes a second semiconductor element, a fourth resistor, and a fifth resistor. A first pole of the second semiconductor element is coupled to the fourth resistor, and its control pole is coupled to the trigger tube via the fifth resistor. When the trigger tube conducts, the second semiconductor element conducts, and the analog leakage current signal flows through the second semiconductor element and the fourth resistor.

[0011] In a preferred embodiment, the fault signal generation module includes a third resistor and a second capacitor connected in series. Under the action of the analog leakage trigger signal, the second capacitor is continuously charged. When the leakage current detection module fails and the analog leakage trigger signal cannot be shut down, the fault signal generation module generates the self-check fault signal through the second capacitor.

[0012] In a preferred embodiment, the fault signal generation module includes a third resistor, and the leakage current detection module includes a fourth capacitor. Under the action of the analog leakage trigger signal, the fourth capacitor is continuously charged. When the leakage current detection module fails and the analog leakage trigger signal cannot be shut down, the fault signal generation module generates the self-check fault signal through the fourth capacitor.

[0013] In a preferred embodiment, the first semiconductor element and the second semiconductor element are selected from one of the following: thyristor, bipolar transistor, field effect transistor, and optocoupler.

[0014] In a preferred embodiment, the tripping module includes: a switch module coupled between an input end and an output end of the power supply line for controlling the power connection between the input end and the output end; and a driving module for driving the switch module based on the self-checking fault signal to disconnect the power connection.

[0015] In a preferred embodiment, the leakage current detection module includes a processor and at least one leakage detection coil, wherein the processor generates the detection feedback signal according to the leakage current signal detected by the leakage detection coil.

[0016] In a preferred embodiment, the trigger tube is an electronic component triggered by a voltage threshold.

[0017] A second aspect of the present disclosure provides an electrical connection device, characterized in that the electrical connection device includes: a housing; and a leakage protection device according to any one of the embodiments of the first aspect, the leakage protection device being accommodated in the housing.

[0018] A third aspect of the present disclosure provides an electrical appliance, characterized in that the electrical appliance includes: 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 protection device according to any one of the embodiments of the first aspect.

[0019] In the present disclosure, by using discrete components to implement the self-checking module in the leakage protection device, while improving the circuit safety and ensuring the electrical safety, the circuit structure is greatly simplified, and the production cost is reduced to a large extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments are illustrated and explained with reference to the accompanying drawings. These drawings are used to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. These drawings are not to scale. In the drawings, the same reference numerals denote similar features. Additionally, the connection lines between each block in the architecture diagram represent an electrical or magnetic coupling between two blocks, and the absence of a connection line between two blocks does not mean that the two blocks are not coupled.

[0021] Figure 1 The architecture diagram of the leakage protection device according to an embodiment of the present disclosure is shown;

[0022] Figure 2 The schematic architecture diagram of the leakage protection device according to the first embodiment of the present disclosure is shown;

[0023] Figure 3Shows a schematic diagram of the principle of a leakage protection device according to a second embodiment of the present disclosure;

[0024] Figure 4 Shows a schematic diagram of the principle of a leakage protection device according to a third embodiment of the present disclosure;

[0025] Figure 5 Shows a schematic diagram of the principle of a leakage protection device according to a fourth embodiment of the present disclosure;

[0026] Figure 6 Shows a schematic diagram of the principle of a leakage protection device according to a fifth embodiment of the present disclosure;

[0027] Figure 7 Shows a schematic diagram of the principle of a leakage protection device according to a sixth embodiment of the present disclosure. Detailed implementation manners

[0028] In the following detailed description of the preferred embodiments, reference will be made to the accompanying drawings that form a part of the present invention. The accompanying drawings illustrate specific embodiments that can implement the present invention by way of example. The example embodiments are not intended to exhaust all embodiments according to the present invention. It can be understood that other embodiments can be utilized without departing from the scope of the present invention, and structural or logical modifications can also be made. Therefore, the following detailed description is not restrictive, and the scope of the present invention is defined by the appended claims.

[0029] Before introducing the embodiments of the present disclosure, some terms involved in the present disclosure are first explained to better understand the present disclosure. In the present disclosure, a transistor may refer to a transistor of any structure, such as a field effect transistor (FET), a bipolar junction transistor (BJT), or a thyristor, etc. When the transistor is a field effect transistor, its control electrode refers to the gate of the field effect transistor, the first electrode can be the drain or source of the field effect transistor, and the corresponding second electrode can be the source or drain of the field effect transistor; when the transistor is a bipolar junction transistor, its control electrode refers to the base of the bipolar junction transistor, the first electrode can be the collector or emitter of the bipolar junction transistor, and the corresponding second electrode can be the emitter or collector of the bipolar junction transistor; when the transistor is a thyristor, its control electrode refers to the control electrode G of the thyristor, the first electrode is the anode, and the second electrode is the cathode. The simulated leakage current signal is a periodic signal generated by the self-checking module, and its duration is short. Therefore, although the leakage detection module can detect the simulated leakage current signal, it is not necessary for the leakage protection device to disconnect the power connection.

[0030] The present disclosure aims to propose a leakage protection device. The self-checking module of this device realizes the self-checking function through discrete components, so the structure is simple and the cost is low.

[0031] Figure 1 The architecture diagram of a leakage protection device according to an embodiment of the present disclosure is shown.

[0032] As Figure 1 shown, the leakage protection device 100 includes a leakage current detection module 1, a self-check module 2, and a tripping module 3. The leakage current detection module 1 is coupled between the input end and the output end of the power supply line and is used to detect whether there is a leakage current signal on the power supply line. The self-check module 2 is coupled to the power supply line and the leakage current detection module 1 and is used to periodically generate an analog leakage current signal to detect whether the leakage current detection module 1 fails. The self-check module 2 includes an analog leakage trigger module 21, an analog leakage current generation module 22, a trigger signal shutdown module 23, and a fault signal generation module 24. The analog leakage trigger module 21 is used to periodically generate an analog leakage trigger signal. The analog leakage current generation module 22 is coupled to the analog leakage trigger module 21, receives the analog leakage trigger signal, and generates an analog leakage current signal triggered by the analog leakage trigger signal. The analog leakage current signal simulates the leakage current signal on the power supply line. Thus, when the analog leakage current signal is generated, the leakage current detection module 1 will detect the analog leakage current signal and generate a detection feedback signal. The detection feedback signal is provided to the trigger signal shutdown module 23, and the trigger signal shutdown module 23 shuts down the analog leakage trigger signal under the action of the detection feedback signal, thereby shutting down the analog leakage current signal. The fault signal generation module 24 is coupled to the analog leakage trigger module to monitor whether the analog leakage trigger signal is shut down. When the leakage current detection module 1 fails and the analog leakage trigger signal cannot be shut down, it generates a self-check fault signal and provides it to the tripping module 3. The tripping module 3 is coupled between the input end and the output end of the power supply line and disconnects the power connection on the power supply line under the action of the self-check fault signal.

[0033] Figure 2 The schematic architecture diagram of a leakage protection device according to the first embodiment of the present disclosure is shown.

[0034] As Figure 2 shown, the leakage protection device 200 is coupled between the input end LINE and the load device LOAD, and it includes switches SW1 and RESET for controlling the on / off of the power connection of the power supply line. The leakage current detection module 1 includes a leakage detection coil CT1 through which the power supply line passes and a processor U1. The tripping module includes a switch module 31 and a driving module 32. The switch module 31 includes switches SW1 and a reset switch RESET, and the driving module 32 includes a switch driving element (such as a solenoid SOL) and two transistors Q1, Q2.

[0035] When the leakage protection device performs leakage detection, both the switch SW1 and the reset switch RESET are closed. When the currents in the live wire (L) and the neutral wire (N) are balanced, no current imbalance will be generated in the leakage detection loop CT1. When there is a current imbalance in the power supply line passing through the leakage detection coil CT1, that is, when there is a leakage current signal, a corresponding induced voltage will be generated on the leakage detection coil CT1. The leakage detection coil CT1 is coupled to pins 4, 5, and 6 of the processor U1. When the voltage output by the leakage detection coil CT1 is greater than the threshold, a high level is output at pin 1 of U1, and a low level is output otherwise. The high level at pin 1 of U1 is supplied to the transistors Q1 and Q2, causing the transistor Q1 and / or Q2 to conduct, and then causing a current change in the coil of the solenoid SOL to generate a magnetic field, causing the switches SW1 and RESET to open, thereby disconnecting the power connection on the power supply line.

[0036] Continue to refer to Figure 2 , the self-checking module 2 includes an analog leakage triggering module 21, an analog leakage current generating module 22, a trigger signal closing module 23, and a fault signal generating module 24. Refer to Figure 2 , in this embodiment, the analog leakage triggering module 21 includes a trigger tube D01 and a delay module. The trigger tube D01 generates an analog leakage trigger signal when it conducts. The trigger tube can be any electronic component triggered by a voltage threshold. The delay module is used to control the conduction of the trigger tube D01, thereby controlling the interval time for generating the analog leakage trigger signal. In this embodiment, the delay block includes a first resistor R01 and a first capacitor C01 connected in series. By setting the resistance value of the first resistor R01 and the capacitance value of the first capacitor C01, the interval time for generating the analog leakage trigger signal can be adjusted. The node A between the first resistor R01 and the first capacitor C01 is connected to the trigger tube D01. The analog leakage current generating module 22 includes a second resistor R02, which is coupled to the trigger tube. When the potential of the upper plate of the first capacitor C01 (the potential at node A) reaches the trigger voltage of the trigger tube D01, the trigger tube D01 conducts, thereby generating an analog leakage current signal through the second resistor R02 and flowing through the leakage detection coil CT1. It can be understood that this analog leakage current signal is an actively generated current by the self-checking module 2, used to simulate the leakage current signal generated when a fault occurs in the power supply line.

[0037] The leakage current detection module 1 detects the analog leakage current signal and generates a detection feedback signal. Specifically, the leakage detection coil CT1 detects the analog leakage current signal generated by the analog leakage current generation module 22 and generates an induced voltage. When the voltage output by the leakage detection coil CT1 is greater than the threshold value, the pin 1 of U1 outputs a high level, that is, the detection feedback signal. This detection feedback signal is provided to the trigger signal shutdown module 23. The trigger signal shutdown module 23 includes a first semiconductor element. In this embodiment, the first semiconductor element is implemented as a transistor Q01. The high level output by the pin 1 of U1 causes the transistor Q01 to conduct, thereby providing a discharge path for the charge on the first capacitor C01, and then shutting down the analog leakage trigger signal, that is, the potential of the upper plate of the first capacitor C01 is lower than the trigger voltage of the trigger tube D01, causing the trigger tube D01 to cut off. Correspondingly, no analog leakage current signal is generated on the second resistor R02.

[0038] The fault signal generation module 24 includes a third resistor R03 and a second capacitor C02 connected in series. When the leakage current detection module 1 fails and the analog leakage trigger signal cannot be shut down, the second capacitor C02 generates a self-check fault signal. Specifically, the third resistor R03 and the second capacitor C02 are connected in series and then connected in parallel with the second resistor R02. The middle node of the third resistor R03 and the second capacitor C02 is connected to the transistors Q1 and Q2 in the drive module 32 via the diode D12. As described above, an analog leakage current signal is generated by the trigger of the analog leakage trigger signal. At the same time, a current will also flow through the third resistor R03, and this current continuously charges the second capacitor C02. In the case where the leakage current detection module 1 does not fail, it will generate a detection feedback signal when detecting the analog leakage current signal, and then shut down the analog leakage trigger signal and the analog leakage current signal. Since the duration of the analog leakage current signal is short, the potential of the upper plate of the second capacitor C02 (the potential at node B) is not sufficient to drive the transistors Q1 and Q2. However, when the leakage current detection module 1 fails, the leakage current detection module 1 cannot generate a detection feedback signal, so the analog leakage trigger signal cannot be shut down. At this time, the trigger tube D01 is in a conducting state for a long time, so the analog leakage current signal also continuously flows through. As the second capacitor C02 is continuously charged, its upper plate potential keeps rising. When the upper plate potential of the second capacitor C02 reaches a preset value, the driving transistors Q1 and / or Q2 conduct, and then a current change is generated in the coil of the solenoid SOL to generate a magnetic field, causing the switches SW1 and RESET to disconnect, thereby disconnecting the power connection on the power supply line. The failure of the leakage current detection module 1 includes but is not limited to the following situations: the electronic components in the leakage current detection module 1 (such as the leakage detection coil CT1, the resistor R1, etc.) are open or short-circuited, or the processor U1 is damaged, etc. When the above situation occurs, the processor U1 will not be able to output a high level.

[0039] The working process of the self-check module 2 will be described below.

[0040] The leakage detection module 1 works normally: The current flows through the first resistor R01 and charges the first capacitor C01. After a preset time, the potential of the upper plate of the first capacitor C01 reaches the trigger voltage of the trigger tube D01, which causes the trigger tube D01 to conduct, thus forming a current loop and generating an analog leakage current signal through the second resistor R02. The leakage detection coil CT1 detects this analog leakage current signal, and the induced voltage generated causes the pin 1 of the processor U1 to output a high level. This high level causes the transistor Q01 to conduct, which provides a discharge path for the first capacitor C01. The first capacitor C01 discharges through the transistor Q01, and the potential of its upper plate decreases, so that it cannot reach the trigger voltage of the trigger tube D01. Therefore, the trigger tube D01 cuts off, and the current cannot flow through the trigger tube D01, nor can a current loop be formed to generate an analog leakage current signal. The above process completes a cycle of self-check. At the beginning of the next cycle, the current continues to charge the first capacitor C01 until the potential of the upper plate of the first capacitor C01 reaches the trigger voltage of the trigger tube D01, and the above process is repeated.

[0041] The leakage detection module 1 fails: If the leakage detection module 1 loses its leakage protection ability due to an open circuit of the leakage detection coil CT1, an open circuit of the resistor R1, damage to the processor U1, etc., the pin 1 of the processor U1 outputs a low level and cannot cause the transistor Q01 to conduct. Since the transistor Q01 is in the cut-off state, a discharge path cannot be provided for the first capacitor C01, so the potential of the upper plate of the first capacitor C01 causes the trigger tube D01 to be in the conducting state for a long time. In this case, an analog leakage current signal continuously flows through the second resistor R02. The current flowing through the third resistor R03 continuously charges the second capacitor C02, causing the potential of the upper plate of the second capacitor C02 to continuously rise. When the potential of the upper plate of the second capacitor C02 reaches the preset value, the driving transistors Q1 and / or Q2 conduct. The conduction of the transistors Q1 and / or Q2 will cause the current in the solenoid SOL to increase instantaneously, thereby disconnecting the switch SW1 and RESET, that is, disconnecting the power connection on the power supply line, and the user can no longer use it.

[0042] In summary, in this embodiment, by using discrete components to implement the self-check module in the leakage protection device, while improving the circuit safety and ensuring the electrical safety, the circuit structure is greatly simplified, and the production cost is reduced to a great extent.

[0043] Figure 3 The schematic diagram of the principle of the leakage protection device according to the second embodiment of the present disclosure is shown.

[0044] In Figure 3 the embodiment of Figure 2The main difference is that two leakage induction coils CT1 and CT2 are adopted in the leakage current detection module 1 of the leakage protection device 300, thereby increasing the leakage protection for the neutral line. Correspondingly, there are two groups of reset switches RESET. In addition, in the drive module 32 of the tripping module, two solenoids SOL1 and SOL2 are adopted to provide redundant leakage protection when one of the solenoids is damaged. The self-check module 2 of the leakage protection device 300 is the same as Figure 2 and will not be elaborated here.

[0045] Figure 4 FIG. shows a schematic diagram of the principle of a leakage protection device according to a third embodiment of the present disclosure.

[0046] In Figure 4 the embodiment of, the main difference from Figure 2 is that two leakage induction coils CT1 and CT2 are adopted in the leakage current detection module 1 of the leakage protection device 400, and CT2 is mainly used for neutral line protection. In addition, in the drive module 32 of the tripping module, instead of the solenoid SOL, a relay RELAY is adopted to control the opening and closing of the switch module 31. In the normal working condition, current flows through the relay, causing the switch in the switch module 31 to close. When the leakage current detection module 1 detects a leakage current on the power supply line, the pin 5 of the processor U1 outputs a high level, driving the transistor Q1 and / or Q2 to conduct, the voltage at the upper end of the relay decreases, so that the current in the relay is turned off, and then the switch in the switch module 31 is disconnected. The self-check module 2 of the leakage protection device 400 is the same as Figure 2 and will not be elaborated here.

[0047] Figure 5 FIG. shows a schematic diagram of the principle of a leakage protection device according to a fourth embodiment of the present disclosure.

[0048] In Figure 5 the embodiment of, the main difference from Figure 2 is that two leakage induction coils CT1 and CT2 are adopted in the leakage current detection module 1 of the leakage protection device 500, and CT2 is mainly used for neutral line protection. In addition, in the drive module 32 of the tripping module, two solenoids SOL1 and SOL2 are adopted to provide redundant leakage protection when one of the solenoids is damaged. The self-check module 2 of the leakage protection device 500 is the same as Figure 2 and will not be elaborated here.

[0049] Figure 6 FIG. shows a schematic diagram of the principle of a leakage protection device according to a fifth embodiment of the present disclosure.

[0050] In Figure 6In the embodiment, the leakage current detection module 1, the switch module 31, and the drive module 32 of the leakage protection device 600 are the same as Figure 4 which will not be elaborated here. The main difference between the self-check module 2 and Figure 2 is the simulated leakage current generation module 22. The other three modules, namely the simulated leakage trigger module 21, the trigger signal shutdown module 23, and the fault signal generation module 24, are the same as Figure 2 . As shown in Figure 6 , the simulated leakage current generation module 22 includes a second semiconductor element, a fourth resistor R04, and a fifth resistor R05. In this embodiment, the second semiconductor element is implemented as a transistor Q02. The first pole of the transistor Q02 is coupled to the fourth resistor R04, and the control pole is coupled to the trigger diode D01 via the fifth resistor R05. When the trigger diode D01 conducts, the transistor Q02 also conducts, thereby generating a simulated leakage current signal through the fourth resistor R04. In addition, the third resistor R03 of the fault signal generation module 24 is coupled to the fifth resistor R05 and the trigger diode D01, and charges the second capacitor C02 through the current flowing through the trigger diode D01.

[0051] The working process of the self-check module 2 will be described below.

[0052] The leakage detection module 1 works normally: The current flows through the first resistor R01 and charges the first capacitor C01. After a preset time, the potential of the upper plate of the first capacitor C01 reaches the trigger voltage of the trigger diode D01, which causes the trigger diode D01 to conduct, and at the same time the transistor Q02 also conducts, thus forming a current loop and generating a simulated leakage current signal through the fourth resistor R04. The leakage detection coil CT1 detects this simulated leakage current signal, and the induced voltage generated causes the pin 5 of the processor U1 to output a high level. This high level causes the transistor Q01 to conduct, which provides a discharge path for the first capacitor C01. The first capacitor C01 discharges through the transistor Q01, and the potential of its upper plate decreases, so that it cannot reach the trigger voltage of the trigger diode D01. Therefore, the trigger diode D01 turns off, and at the same time the transistor Q01 also turns off, and thus a current loop cannot be formed and a simulated leakage current signal cannot be generated. The above process completes a cycle of self-check. At the beginning of the next cycle, the current continues to charge the first capacitor C01 until the potential of the upper plate of the first capacitor C01 reaches the trigger voltage of the trigger diode D01, and the above process is repeated.

[0053] The leakage detection module 1 malfunctions: For example, due to the open circuit of the leakage detection coil CT1, the damage of the processor U1, etc., the leakage detection module 1 loses its leakage protection ability. The pin 5 of the processor U1 outputs a low level, which cannot turn on the transistor Q01. Since the transistor Q01 is in the cut-off state, a discharge path cannot be provided for the first capacitor C01. Therefore, the potential of the upper plate of the first capacitor C01 keeps the trigger tube D01 in the conducting state for a long time. In this case, the current flowing through the third resistor R03 continuously charges the second capacitor C02, causing the potential of the upper plate of the second capacitor C02 to rise continuously. When the potential of the upper plate of the second capacitor C02 reaches the preset value, the driving transistors Q1 and / or Q2 are turned on. The conduction of the transistors Q1 and / or Q2 will lower the potential of the upper end of the relay RELAY, thereby closing the current in the relay RELAY, and then turning off the switch in the switch module 31, that is, disconnecting the power connection on the power supply line, and the user can no longer use it.

[0054] Figure 7 FIG. shows a schematic diagram of the principle of a leakage protection device according to a sixth embodiment of the present disclosure.

[0055] In Figure 7 the embodiment of, the leakage current detection module 1, the switch module 31, and the driving module 32 of the leakage protection device 700 are the same as Figure 2 and will not be described in detail here. The main difference between the self-checking module 2 and Figure 2 lies in the fault signal generation module 24. The other three modules, the analog leakage trigger module 21, the analog leakage current generation module 22, and the trigger signal closing module 23, are the same as Figure 1 . As shown in Figure 7 , the fault signal generation module 24 only includes the third resistor R03. Instead of the second capacitor C02 in the above embodiment, in this embodiment, the third resistor R03 is used in combination with the fourth capacitor C1 in the leakage current detection module 1. That is to say, when the leakage detection module 1 malfunctions, the analog leakage trigger signal and the analog leakage current signal cannot be turned off, resulting in the current flowing through the third resistor R03 continuously charging the fourth capacitor C1, causing the potential of the upper plate of the fourth capacitor C1 to rise continuously. When it reaches the preset value, the driving transistors Q1 and / or Q2 are turned on, and the solenoid SOL drives the switch SW1. In this way, the number of components in the self-checking circuit can be further reduced, thereby reducing the cost.

[0056] In the above embodiment, by using discrete components to implement the self-checking module in the leakage protection device, while improving the circuit safety and ensuring the electrical safety, the circuit structure is greatly simplified, and the production cost is reduced to a large extent.

[0057] Although the transistor is described as an example in the above embodiments, it can be understood that the transistor can also be other types of semiconductor components, such as any switching component triggered by a voltage threshold, such as an optocoupler element.

[0058] The present disclosure also provides an electrical connection device, including: a housing; and a leakage protection device according to any one of the above embodiments, the leakage protection device being accommodated in the housing.

[0059] The third aspect of the present disclosure provides an electrical appliance, including: a load device; an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, the electrical connection device including a leakage protection device according to any one of the above embodiments.

[0060] Therefore, although the present invention is described with reference to specific examples, which are merely illustrative and not intended to limit the present invention, it will be apparent to those of ordinary skill in the art that changes, additions, or deletions can be made to the disclosed embodiments without departing from the spirit and scope of the present invention.

Claims

1. A leakage protection device, characterized in that, The leakage protection device includes: A leakage current detection module configured to detect a leakage current signal on a power supply line and generate a detection feedback signal when the leakage current signal is detected; A self-check module configured to detect whether the leakage current detection module fails. The self-check module includes: An analog leakage trigger module configured to generate an analog leakage trigger signal; An analog leakage current generation module configured to generate an analog leakage current signal triggered by the analog leakage trigger signal for simulating the leakage current signal; A trigger signal shutdown module configured to shut down the analog leakage trigger signal under the action of the detection feedback signal; and A fault signal generation module coupled to the analog leakage trigger module and configured to generate a self-check fault signal when the leakage current detection module fails; and A trip module configured to disconnect the power connection on the power supply line under the action of the self-check fault signal, where The analog leakage trigger module is composed of discrete electronic components and includes: A trigger tube that generates the analog leakage trigger signal when conducting; A delay module coupled to the trigger tube and controlling the conduction of the trigger tube, thereby controlling the interval time for generating the analog leakage trigger signal, and where The analog leakage current generation module includes a second resistor coupled to the trigger tube. When the trigger tube conducts, the analog leakage current signal flows through the second resistor.

2. The leakage protection device according to claim 1, characterized in that, The analog leakage current generation module, the trigger signal shutdown module, and the fault signal generation module are all composed of discrete electronic components.

3. The leakage protection device according to claim 1, characterized in that, The delay module includes a first resistor and a first capacitor connected in series. And the trigger signal shutdown module includes a first semiconductor component. The detection feedback signal is used to control the conduction of the first semiconductor component to provide a discharge path for the charge on the first capacitor, thereby shutting down the analog leakage trigger signal.

4. The leakage protection device according to claim 1, characterized in that, The analog leakage current generation module includes a second semiconductor component, a fourth resistor, and a fifth resistor. A first pole of the second semiconductor component is coupled to the fourth resistor, and its control pole is coupled to the trigger tube via the fifth resistor. When the trigger tube conducts, the second semiconductor component conducts, and the analog leakage current signal flows through the second semiconductor component and the fourth resistor.

5. The leakage protection device according to claim 1, characterized in that, The fault signal generation module includes a third resistor and a second capacitor connected in series. Under the action of the analog leakage trigger signal, the second capacitor is continuously charged. When the leakage current detection module fails and the analog leakage trigger signal cannot be shut down, the fault signal generation module generates the self-check fault signal through the second capacitor.

6. The leakage protection device according to claim 1, characterized in that, The fault signal generation module includes a third resistor, and the leakage current detection module includes a fourth capacitor. Under the action of the analog leakage trigger signal, the fourth capacitor is continuously charged. When the leakage current detection module fails and the analog leakage trigger signal cannot be shut down, the fault signal generation module generates the self-check fault signal through the fourth capacitor.

7. The leakage protection device according to claim 3 or 4, characterized in that, The first semiconductor element and the second semiconductor element are selected from one of the following: thyristor, bipolar transistor, field effect transistor, and optocoupler element.

8. The leakage protection device according to claim 1, characterized in that, The trip module includes: a switch module coupled between an input end and an output end of the power supply line for controlling the power connection between the input end and the output end; and a driving module for driving the switch module based on the self-checking fault signal to disconnect the power connection.

9. The leakage protection device according to claim 1, characterized in that, The leakage current detection module includes a processor and at least one leakage detection coil, wherein the processor generates the detection feedback signal according to the leakage current signal detected by the leakage detection coil.

10. The leakage protection device according to claim 1, characterized in that, The trigger tube is an electronic component triggered by a voltage threshold.

11. An electrical connection device, characterized in that, The electrical connection device includes: a housing; and a leakage protection device according to any one of claims 1-10, the leakage protection device being accommodated in the housing.

12. An electrical appliance, characterized in that, The electrical appliance includes: a load device; 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 protection device according to any one of claims 1-10.

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