Leakage protection device, electrical connection device and electrical appliance

Abstract

A leakage protection device includes: a leakage current detection module that detects a leakage current signal on a power supply line and generates a detection feedback signal when the leakage current signal is detected, and the power supply line powers it in a half cycle of alternating current; and a self-check module that detects whether the leakage current detection module fails based on the detection feedback signal, and includes: an analog leakage current generation module that generates an analog leakage current signal to simulate the leakage current signal; a fault signal generation module that generates a self-check fault signal when the leakage current detection module fails; and a self-check compensation module that provides an additional working power supply to the leakage current detection module, thereby ensuring that the leakage current detection module is in a working state when the analog leakage current signal is generated. The self-check module of the present disclosure provides an additional working power supply to the leakage current detection module, thus avoiding misjudgment.

Description

Technical Field

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

[0002] Currently, due to various factors such as cost and reliability, the power supply part of the leakage current detection module of most leakage protection devices adopts a half-bridge rectification scheme. Therefore, such leakage protection devices only detect the leakage current signal on the power supply line in half a cycle of the alternating current, that is, their working time period is half a cycle of the alternating current. When adding a self-checking function to such a leakage protection device, since the time for the self-checking module to generate an analog leakage current signal is uncertain, for example, it may be generated at the edge of the working half-cycle or the non-working half-cycle of the leakage current detection module, even if the leakage current detection module does not malfunction, it may not be able to normally detect the analog leakage current signal and generate a detection feedback signal, which causes the self-checking module to misjudge that the leakage current detection module has malfunctioned, thereby causing the leakage protection device to disconnect the power connection. Summary of the Invention

[0003] Based on the above problems, the present disclosure proposes a leakage protection device, which has a self-checking compensation module for providing an additional working power supply to the leakage current detection module, thereby ensuring that the leakage current detection module is in a working state when an analog leakage current signal is generated. In this way, the self-checking module can reliably complete the self-checking when triggering the self-checking function at any time, avoiding misjudgment.

[0004] The 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 detecting the leakage current signal, and the power supply line supplies power to the leakage current detection module in half a cycle of the alternating current; a self-checking module configured to detect whether the leakage current detection module malfunctions based on the detection feedback signal, and the self-checking module includes: an analog leakage current generation module configured to generate an analog leakage current signal to simulate the leakage current signal; a fault signal generation module configured to generate a self-checking fault signal when the leakage current detection module malfunctions; and a self-checking compensation module configured to provide an additional working power supply to the leakage current detection module, thereby ensuring that the leakage current detection module is in a working state when the analog leakage current signal is generated.

[0005] In a preferred embodiment, the self-checking compensation module includes: an energy storage module configured to store electrical energy obtained from the power supply line; and a power coupling element configured to couple the energy storage module to the power supply circuit of the leakage current detection module to supply electrical energy to the leakage current detection module.

[0006] In a preferred embodiment, the energy storage module includes a first resistor and a first capacitor connected in series. The power supply line charges the first capacitor via the first resistor, and the first capacitor is used to supply electrical energy to the leakage current detection module via a power coupling element.

[0007] In a preferred embodiment, the power coupling element is selected from one or more of the following: a unidirectional conduction element, a controllable semiconductor element, and a resistor.

[0008] In a preferred embodiment, the self-check module further includes: an analog leakage trigger module configured to generate an analog leakage trigger signal; and a trigger signal shutdown module configured to shut down the analog leakage trigger signal under the action of a detection feedback signal. Wherein, the analog leakage current generation module generates an analog leakage current signal triggered by the analog leakage trigger signal, and the fault signal generation module is coupled to the analog leakage trigger module.

[0009] In a preferred embodiment, the first capacitor supplies electrical energy to the leakage current detection module or stops supplying electrical energy in response to the generation and shutdown of the analog leakage trigger signal.

[0010] In a preferred embodiment, the analog leakage trigger module includes a trigger tube, one end of which is coupled between the first resistor and the first capacitor, and the other end is coupled to the power coupling element, and generates an analog leakage trigger signal when conducting.

[0011] In a preferred embodiment, the first capacitor supplies electrical energy to the leakage current detection module throughout the entire cycle of the alternating current.

[0012] In a preferred embodiment, the analog leakage trigger module, the analog leakage current generation module, the trigger signal shutdown module, the fault signal generation module, and the self-check compensation module are all composed of discrete electronic components.

[0013] In a preferred embodiment, the leakage protection device further includes a fault response module configured to send fault indication information and / or disconnect the electrical connection on the power supply line under the action of a self-check fault signal.

[0014] A second aspect of the present disclosure proposes 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.

[0015] 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.

[0016] In the present disclosure, by providing an additional working power supply for the leakage detection module through the self-check compensation module, it can ensure that the self-check module can reliably complete the self-check when triggering the self-check function at any time, avoiding misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 represent similar features. Additionally, the connection lines between each block in the architecture diagram indicate an electrical coupling between two blocks, and the absence of a connection line between two blocks does not mean that the two blocks are not coupled.

[0018] Figure 1 The architecture diagram of the leakage protection device according to an embodiment of the present disclosure is shown;

[0019] Figure 2 The schematic architecture diagram of the leakage protection device according to the first embodiment of the present disclosure is shown;

[0020] Figure 3 The schematic principle diagram of the leakage protection device according to the second embodiment of the present disclosure is shown;

[0021] Figure 4 The schematic principle diagram of the leakage protection device according to the third embodiment of the present disclosure is shown; and

[0022] Figure 5 The schematic principle diagram of the leakage protection device according to the fourth embodiment of the present disclosure is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In the following detailed description of the preferred embodiments, reference will be made to the accompanying drawings which form a part of the present invention. The accompanying drawings illustrate, by way of example, specific embodiments that can be implemented in the present invention. The exemplary 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.

[0024] 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 may be the drain or source of the field effect transistor, and the corresponding second electrode may 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 may be the collector or emitter of the bipolar junction transistor, and the corresponding second electrode may 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 analog 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 analog leakage current signal, it is not necessary for the leakage protection device to disconnect the power connection.

[0025] The present disclosure aims to propose a leakage protection device, and the self-checking module of the device includes a self-checking compensation module, which can provide an additional working power supply for the leakage detection module. Therefore, it can ensure that the self-checking module can reliably complete the self-check when triggering the self-check function at any time, and avoid misjudgment.

[0026] Figure 1 The architecture diagram of the leakage protection device according to the embodiment of the present disclosure is shown.

[0027] As Figure 1As shown in the figure, the leakage protection device 100 includes a leakage current detection module 1, a self-check module 2, and a fault response module 3. The leakage current detection module 1 is coupled between the input end and the output end of the power supply line for detecting whether there is a leakage current signal on the power supply line. The power supply line provides alternating current between its input ends and powers the leakage current detection module 1 in half a cycle of the alternating current. The self-check module 2 is coupled to the power supply line and the leakage current detection module 1 for periodically generating 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, a fault signal generation module 24, and a self-check compensation module 25. The analog leakage trigger module 21 is used for periodically generating 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. 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 22 to monitor whether the analog leakage trigger signal is shut down. When the leakage current detection module 1 fails and causes the analog leakage trigger signal to not be shut down, the fault signal generation module 24 generates a self-check fault signal and provides it to the fault response module 3. The self-check compensation module 25 is coupled to the leakage current detection module 1 and provides an additional working power supply to the leakage current detection module 1, thereby ensuring that the leakage current detection module 1 is in a working state when the analog leakage current signal is generated. The fault response 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. In other embodiments, the fault response module 3 may also issue fault indication information such as an audible / visual alarm under the action of the self-check fault signal.

[0028] In some embodiments, the self-check compensation module 25 further includes an energy storage module and a power coupling element ( Figure 1 not shown in the figure). The energy storage module is used for storing the electric energy obtained from the power supply line, and the power coupling element is used for coupling the energy storage module to the power supply circuit of the leakage current detection module 1 to provide electric energy to the leakage current detection module 1.

[0029] In some embodiments, the energy storage module includes a first resistor and a first capacitor connected in series. The power supply line charges the first capacitor via the first resistor. The power supply line can supply power to the leakage current detection module 1 and charge the first capacitor during a half cycle of the alternating current. Alternatively, the power supply line can also charge the first capacitor during the entire cycle of the alternating current. This first capacitor is used to supply electrical energy to the leakage current detection module 1 via a power coupling element.

[0030] In some embodiments, the power coupling element is selected from one or more of the following: a unidirectional conduction element, a controllable semiconductor element, and a resistor. The unidirectional conduction element includes, but is not limited to, a diode. The controllable semiconductor element includes, but is not limited to, a trigger diode, a bipolar transistor, a field effect transistor, a thyristor, an opto-coupler, etc.

[0031] Figure 2 The schematic diagram of the architecture of the leakage protection device according to the first embodiment of the present disclosure is shown.

[0032] As Figure 2 shown, the leakage protection device 200 is coupled between the input terminal LINE and the load device LOAD. The leakage current detection module 1 includes a leakage detection coil CT1 through which the power supply line passes and a processor U1. The fault response module includes a switch module 31 and a drive module 32. The switch module 31 includes a switch SW1 and a reset switch RESET, which are used to control the on / off of the power connection of the power supply line. The drive module 32 includes a switch driving element (such as a solenoid SOL) and two transistors Q1, Q2. The live wire (L) is coupled to pin 3 of the processor U1 through a resistor R1 to supply power to the processor U1 during the positive half cycle of the alternating current.

[0033] When the leakage protection device 200 performs leakage detection, both the switch SW1 and the reset switch RESET are closed. When the currents of 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 the processor 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 disconnect, thereby disconnecting the power connection on the power supply line.

[0034] Continue to refer to Figure 2, 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, a fault signal generation module 24, and a self-check compensation module 25. Refer to Figure 2 , in this embodiment, the self-check compensation module 25 includes a first resistor R01, a first capacitor C01, and a diode D02 connected in series. The analog leakage trigger module 21 includes a trigger tube D01. One end of the trigger tube D01 is connected to the node A between the first resistor R01 and the first capacitor C01, and the other end is connected to the positive electrode of the diode D02. The negative electrode of the diode D02 is connected to the pin 3 of the processor U1. When the trigger tube D01 is turned on, it generates an analog leakage trigger signal, which can be any electronic component triggered by a voltage threshold. In this embodiment, the first resistor R01 and the first capacitor C01 are not only used to provide an additional working power supply for the processor U1 via the diode D02, but also used to control the conduction of the trigger tube D01, thereby controlling the interval time for generating the analog leakage trigger signal. The resistance value of the first resistor R01 and the capacitance value of the first capacitor C01 can be set according to the required power supply voltage of the processor U1 and the desired interval time for generating the analog leakage trigger signal. The analog leakage current generation module 22 includes a second resistor R02, which is coupled to the trigger tube D01. The live wire (L) is coupled to the first capacitor C01 through the diode D11 and the first resistor R01 to charge the first capacitor C01 during the positive half-cycle of the alternating current. When the potential of the upper plate of the first capacitor C01 (the potential at the node A) reaches the trigger voltage of the trigger tube D01, the trigger tube D01 is turned on, 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-check module 2 to simulate the leakage current signal generated when a power supply line fails. At the same time, the first capacitor C01 also supplies power to the processor U1 through the diode D02. In this way, while generating the analog leakage trigger signal and the analog leakage current signal, the first capacitor C01 provides an additional working power supply for U1. Therefore, even if the analog leakage trigger signal and the analog leakage current signal are generated at the edge of the positive half-cycle or the negative half-cycle of the alternating current (the power supply line does not provide a working power supply for U1), since the self-check compensation module 25 provides an additional working power supply for the processor U1, U1 is also in a working state, and thus can detect this analog leakage current signal when no fault occurs.

[0035] When the leakage current detection module 1 does not malfunction, it 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 the processor 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 turning off 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. Accordingly, no analog leakage current signal is generated on the second resistor R02, and the first capacitor C01 no longer provides an additional working power supply to U1.

[0036] 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 turned off, 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 intermediate node B of the third resistor R03 and the second capacitor C02 is connected to the transistors Q1 and Q2 in the drive module 32 via a 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 turn off 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, that is, the pin 1 of U1 outputs a low level, so the transistor Q01 cannot be turned on to turn off the analog leakage trigger signal. At this time, the trigger tube D01 is in the conducting state for a long time, so the analog leakage current signal also continuously flows through. As the second capacitor C02 is continuously charged, the potential of its upper plate keeps rising. When the potential of the upper plate of the second capacitor C02 reaches a preset value, the driving transistors Q1 and / or Q2 are turned on, 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 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 situations occur, the processor U1 will not be able to output a high level. Since the first capacitor C01 supplies power to the processor U1 via the diode D02 while the trigger tube D01 is conducting, the processor U1 can also detect the analog leakage current signal even if the analog leakage current signal is generated at the positive half-cycle edge or the negative half-cycle of the alternating current. This can ensure the accuracy of the self-check fault signal generated by the fault signal generation module 24, that is, the self-check fault signal is generated due to the failure of the leakage current detection module 1, rather than a misjudgment caused by the processor U1 not being powered.

[0037] The working process of the self-check module 2 will be described below.

[0038] During the positive half-cycle of the alternating current, the live wire (L) supplies power to the processor U1, and at the same time charges the first capacitor C01 via the diode D11 and the first resistor R01. 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. At the same time, the first capacitor C01 supplies power to the processor U1 via the diode D02 to ensure that the processor U1 is provided with an additional working power supply and is in a working state.

[0039] The leakage detection module 1 works normally: The leakage detection coil CT1 detects the 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 via 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 is cut off, and current cannot flow through the trigger tube D01, and thus a current loop cannot be formed and an analog leakage current signal cannot be generated. At the same time, the first capacitor C01 can no longer supply power to the processor U1. The above process completes a cycle of self-check. At the beginning of the next cycle, during the positive half-cycle of the alternating current, 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.

[0040] 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 a 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 a 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 increase. When the potential of the upper plate of the second capacitor C02 reaches a preset value, it drives the transistor Q1 and / or Q2 to conduct. The conduction of the transistor Q1 and / or Q2 will cause the current in the solenoid SOL to increase instantaneously, thus disconnecting the switch SW1 and RESET, that is, disconnecting the power connection on the power supply line, and the user will no longer be able to use it.

[0041] Figure 3 The schematic diagram of the principle of the leakage protection device according to the second embodiment of the present disclosure is shown.

[0042] 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, the reset switch RESET is in two groups. In addition, in the drive module 32 of the fault response 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 also includes a self-check compensation module 25, and its diode D02 is connected to pin 5 of the processor U1. During the positive half cycle of the alternating current, the live wire (L) powers the processor U1 and simultaneously charges the first capacitor C01 via the diode D11 and the first resistor R01. When the trigger tube D01 conducts, the first capacitor C01 powers the processor U1 via the diode D02. Other sub-modules of the self-check module 2 will not be elaborated.

[0043] Figure 4 Fig. shows a schematic diagram of the principle of a leakage protection device according to a third embodiment of the present disclosure.

[0044] In Figure 4 the embodiment of Figure 2 the main difference from Figure 4As shown, the diode D02 of the self-check compensation module 25 is directly connected to the first capacitor C01 without being connected to the trigger tube D01. The leakage current trigger module 21 further includes an additional delay module. In this embodiment, the delay module includes a fourth resistor R04 and a third capacitor C03 connected in series, which are used to control the conduction of the trigger tube D01, thereby controlling the interval time for generating the analog leakage trigger signal. By setting the resistance value of the fourth resistor R04 and the capacitance value of the third capacitor C03, the interval time for generating the analog leakage trigger signal can be adjusted. The live wire (L) is coupled to the first capacitor C01 and the third capacitor C03 through the diode D11, the first resistor R01, and the fourth resistor R04 respectively. In the positive half-cycle of the alternating current, the live wire (L) charges the first capacitor C01 through the first resistor R01 and charges the third capacitor C03 through the fourth resistor R04 at the same time. Once the potential of the upper plate of the first capacitor C01 makes the diode D02 conduct, the first capacitor C01 supplies power to the processor U1 via the diode D02. Additionally, when the potential of the upper plate of the third capacitor C03 reaches the trigger voltage of the trigger tube D01, the trigger tube D01 conducts, generating an analog leakage trigger signal and generating an analog leakage current signal flowing through the leakage detection coil CT1 through the second resistor R02. In this embodiment, since the time for generating the analog leakage current signal is uncertain, the first capacitor C01 needs to supply power to the processor U1 throughout the entire cycle of the alternating current, so as to ensure that U1 is in the working state at any time. Therefore, the resistance value of the first resistor R01 and the capacitance value of the first capacitor C01 can be set according to the magnitude of the power supply voltage required by the processor U1 and the continuous power supply time. In this way, even if the analog leakage current signal is generated at the edge of the positive half-cycle or the negative half-cycle of the alternating current (the power supply line does not provide the working power supply to U1), since the self-check compensation module 25 provides an additional working power supply to the processor U1, U1 is also in the working state, and then it can detect the analog leakage current signal and generate a detection feedback signal without a fault. This can ensure the accuracy of the self-check fault signal generated by the fault signal generation module 24, that is, the self-check fault signal is generated due to a fault in the leakage current detection module 1, rather than a misjudgment caused by the processor U1 not being powered. Other sub-modules of the self-check module 2 will not be elaborated.

[0045] Figure 5 FIG. shows a schematic diagram of the principle of a leakage protection device according to a fourth embodiment of the present disclosure.

[0046] In Figure 5 the embodiment of, the self-check module 2 of the leakage protection device 500 is the same as Figure 4 the embodiment of, and other modules are the same as Figure 3This is the same as the embodiment described above and will not be elaborated here. In this embodiment, the self-check compensation module 25 supplies power to the processor U1 throughout the entire cycle of the alternating current. In this way, even if the simulated leakage current signal is generated in the positive or negative half-cycle of the alternating current (the power supply line does not provide the operating power supply to U1), since the self-check compensation module 25 provides an additional operating power supply to the processor U1, U1 is also in an operating state, and thus can detect the simulated leakage current signal and generate a detection feedback signal without a fault occurring.

[0047] In the above embodiment, the self-check compensation module supplies an additional operating power supply to the leakage current detection module either simultaneously with the generation of the simulated leakage trigger signal or continuously for a long time. Therefore, when the simulated leakage trigger signal and the simulated leakage current signal are generated at any time, the leakage current detection module is in an operating state due to having an operating power supply, and can correctly detect the simulated leakage current signal and generate a detection feedback signal without a fault occurring. In this way, it avoids misjudgment that may be caused by the leakage current detection module not being powered in the positive or negative half-cycle of the alternating current, ensuring the accuracy of the self-check module's detection.

[0048] Although transistors are used as examples in the above embodiments for illustration, it can be understood that the transistors can also be other types of semiconductor elements, such as any switching element triggered by a voltage threshold, like an opto-coupling element.

[0049] 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, which is accommodated in the housing.

[0050] 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, and the electrical connection device includes a leakage protection device according to any one of the above embodiments.

[0051] Therefore, although the present invention is described with reference to specific examples, which are merely illustrative and not restrictive of the present invention, it is obvious 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, and the power supply line supplies power to the leakage current detection module in a half cycle of alternating current; and A self-check module configured to detect whether the leakage current detection module fails based on the detection feedback signal, and the self-check module includes: An analog leakage current generation module configured to generate an analog leakage current signal to simulate the leakage current signal; A fault signal generation module configured to generate a self-check fault signal when the leakage current detection module fails; and A self-check compensation module configured to provide an additional working power supply to the leakage current detection module, thereby ensuring that the leakage current detection module is in a working state when the analog leakage current signal is generated.

2. The leakage protection device according to claim 1, characterized in that, The self-check compensation module includes: An energy storage module configured to store electrical energy obtained from the power supply line; and A power coupling element configured to couple the energy storage module to a power supply circuit of the leakage current detection module to supply the electrical energy to the leakage current detection module.

3. The leakage protection device according to claim 2, wherein The energy storage module includes a first resistor and a first capacitor connected in series, and the power supply line charges the first capacitor via the first resistor, and the first capacitor is used to supply the electrical energy to the leakage current detection module via the power coupling element.

4. The leakage protection device according to claim 2, wherein, The power coupling element is selected from one or more of the following: a unidirectional conduction element, a controllable semiconductor element, and a resistor.

5. The leakage protection device according to claim 3, wherein, The self-check module further includes: An analog leakage trigger module configured to generate an analog leakage trigger signal; and A trigger signal shutdown module configured to shut down the analog leakage trigger signal under the action of the detection feedback signal, wherein The analog leakage current generation module generates the analog leakage current signal triggered by the analog leakage trigger signal, and the fault signal generation module is coupled to the analog leakage trigger module.

6. The leakage protection device according to claim 5, wherein The first capacitor supplies or stops supplying the electrical energy to the leakage current detection module in response to the generation and shutdown of the analog leakage trigger signal.

7. The leakage protection device according to claim 6, wherein The analog leakage trigger module includes a trigger tube, one end of which is coupled between the first resistor and the first capacitor, and the other end is coupled to the power coupling element and generates the analog leakage trigger signal when conducting.

8. The leakage protection device according to claim 3, wherein The first capacitor supplies the electrical energy to the leakage current detection module throughout the cycle of the alternating current.

9. The leakage protection device according to claim 5, characterized in that, The analog leakage trigger module, the analog leakage current generation module, the trigger signal shutdown module, the fault signal generation module, and the self-check compensation module are all composed of discrete electronic components.

10. The leakage protection device according to claim 1, characterized in that, The leakage protection device further includes: A fault response module, which is configured to issue a fault indication message and / or disconnect the power connection on the power supply line under the action of the self-checking fault signal.

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

12. An electrical appliance, characterized in that, The electrical appliance includes: A load device; An electrical connection device, which is coupled between the power supply line and the load device for supplying power to the load device, wherein the electrical connection device includes the leakage protection device according to any one of claims 1-10.

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