Earth leakage protection device, electric connection equipment and electric appliance

Abstract

The utility model provides a leakage protection device comprising a plurality of input ends and a plurality of output ends which are connected through a group of current-carrying wires, and each input end corresponds to one or more output ends; a switch module controlling power connection between the plurality of input terminals and the plurality of output terminals; the electric leakage detection module is used for generating an electric leakage fault signal when the leakage current signal is detected or the leakage current signal exceeds a preset threshold value; the driving module responds to the electric leakage fault signal to drive the switch module to disconnect the power connection between the input end and the output end; a relay module including a switch coupled between the at least one input terminal and the corresponding at least one output terminal; and the signal processing and communication module is used for controlling the relay module to switch off or switch on the switch based on the first control instruction, so that the power connection between the at least one input end and the at least one corresponding output end is switched off or switched on under the condition that the switch module is switched on. According to the utility model, the electric leakage protection device can be remotely controlled safely and reliably.

Description

Technical Field

[0001] This utility model relates to the electrical field, and in particular to a leakage current protection device, an electrical connection device, and an electrical appliance. Background Technology

[0002] With societal development, the number of household appliances is increasing, and their level of intelligence is deepening. This creates a growing demand for leakage current protection devices that are both sufficiently safe and capable of remote monitoring and control. Currently, existing leakage current protection devices can only provide basic leakage protection functions and cannot offer remote control or information monitoring. When users are not near their appliances, they cannot know their operating status, such as whether they are working properly or malfunctioning, nor can they safely and reliably control the power supply to their appliances remotely as needed. Utility Model Content

[0003] Based on the above problems, the first aspect of this utility model proposes a leakage current protection device, comprising: multiple input terminals and multiple output terminals connected by a set of current-carrying lines, each input terminal corresponding to one or more output terminals; a switching module coupled between the multiple input terminals and the multiple output terminals, and configured to control the power connection between the multiple input terminals and the multiple output terminals; a leakage current detection module configured to detect leakage current signals on the set of current-carrying lines, and generate a leakage current fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold; and a driving module coupled to the switching module and the leakage current detection module, and configured to receive the leakage current fault signal. The signal, and in response to the leakage fault signal, drives the switch module to disconnect the power connection between the plurality of input terminals and the plurality of output terminals; a relay module, including a switch coupled between at least one input terminal and a corresponding at least one output terminal; and a signal processing and communication module coupled to the relay module and configured to wirelessly communicate with a remote control device and receive a first control command indicating power on / off from the remote control device, and based on the first control command, control the relay module to open or close the switch, thereby disconnecting or connecting the power connection between the at least one input terminal and the corresponding at least one output terminal when the switch module is closed.

[0004] In some embodiments, the leakage current protection device further includes: a status detection module coupled to at least one of the plurality of output terminals and the signal processing and communication module, and configured to detect the on / off state of the power connection between its coupled output terminal and the corresponding input terminal and generate a connection status detection signal; and the signal processing and communication module is further configured to generate a connection status indication signal based on the connection status detection signal and send it to the remote control device.

[0005] In some embodiments, the state detection module includes an optocoupler and / or a relay.

[0006] In some embodiments, the leakage current protection device further includes: a parameter acquisition module coupled between at least one input terminal and at least one corresponding output terminal and coupled to the signal processing and communication module, and configured to acquire electrical parameters of the leakage current protection device; and the signal processing and communication module is further configured to: receive the acquired electrical parameters of the leakage current protection device, process the electrical parameters, and send the processed electrical parameters to the remote control device.

[0007] In some embodiments, the parameter acquisition module includes: a current sensor configured to acquire the current value on at least one of the current-carrying lines in the set of current-carrying lines and generate a current sampling signal; and the signal processing and communication module further includes: an operational amplifier coupled to the current sensor and configured to amplify the current sampling signal; and an analog-to-digital conversion circuit coupled to the operational amplifier and configured to perform analog-to-digital conversion on the amplified current sampling signal to serve as the electrical parameter.

[0008] In some embodiments, the current sensor includes an alloy resistor and / or a current transformer.

[0009] In some embodiments, the parameter acquisition module includes: a rectifier unit configured to rectify the input voltage of the at least one input terminal; and the signal processing and communication module further includes: a voltage divider unit coupled to the rectifier unit and configured to divide the rectified input voltage; and an analog-to-digital converter circuit coupled to the voltage divider unit and configured to perform analog-to-digital conversion on the divided input voltage to obtain the electrical parameter.

[0010] In some embodiments, the leakage current protection device further includes: a switch button coupled to the signal processing and communication module and configured to send a second control command indicating a wireless connection to the signal processing and communication module when the first operation is performed; and the signal processing and communication module is further configured to establish a wireless connection with the remote control device based on the second control command.

[0011] In some embodiments, the switch button is further configured to send a third control command indicating power on / off to the signal processing and communication module when the second operation is performed, and the signal processing and communication module is further configured to: control the relay module to open or close the switch based on the third control command, thereby disconnecting or connecting the power connection between the at least one input terminal and the corresponding at least one output terminal when the switch module is closed.

[0012] In some embodiments, the leakage current protection device further includes: a display module coupled to the signal processing and communication module, and configured to display the network connection status of the signal processing and communication module and / or the on / off status of the power connection between the at least one input terminal and the corresponding at least one output terminal.

[0013] In some embodiments, the relay module includes a magnetic latching relay.

[0014] In some embodiments, the magnetic latching relay has two sets of coils.

[0015] In some embodiments, the leakage current protection device further includes a power supply module coupled to the leakage current detection module, the relay module, and the signal processing and communication module, and configured to supply power to the leakage current detection module, the relay module, and the signal processing and communication module.

[0016] In some embodiments, the leakage current protection device further includes: a leakage current self-test module coupled to the leakage current detection module and the drive module, and configured to periodically generate a simulated leakage current signal to detect whether the leakage current detection module has failed, and to generate a self-test fault signal when the leakage current detection module fails; and the drive module is further configured to receive the self-test fault signal and, in response to the self-test fault signal, drive the switch module to disconnect the power connection between the plurality of input terminals and the plurality of output terminals.

[0017] The first aspect of this utility model provides a leakage current protection device including a relay module independent of the switch module and a signal processing and communication module, thereby enabling remote control equipment to safely and reliably control the power supply of the leakage current protection device, avoiding the occurrence of dangers, eliminating potential safety hazards, and increasing the safety of the leakage current protection device.

[0018] A second aspect of this invention provides an electrical connection device comprising: a housing; and a leakage current protection device according to any one of the embodiments of the first aspect, the leakage current protection device being housed in the housing.

[0019] A third aspect of this invention provides an electrical appliance comprising: a load device; and an electrical connection device according to any one of the embodiments of the second aspect, coupled to the load device for supplying power to the load device. Attached Figure Description

[0020] Embodiments are illustrated and explained with reference to the accompanying drawings. These drawings are used to illustrate the basic principles and thus only show aspects necessary for understanding the basic principles. These drawings are not to scale. In the drawings, the same reference numerals denote similar features. Furthermore, lines connecting each block in the architectural diagram indicate electrical coupling between the two blocks; the absence of a line between two blocks does not indicate that the two blocks are not coupled.

[0021] Figure 1 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0022] Figure 2A-2C A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0023] Figures 3A-3B A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown; and

[0024] Figures 4A-4B A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown. Detailed Implementation

[0025] In the following detailed description of preferred embodiments, reference will be made to the accompanying drawings, which form part of this invention. The accompanying drawings illustrate specific embodiments that can implement this invention by way of example. The exemplary embodiments are not intended to be exhaustive of all embodiments according to this invention. It will be understood that other embodiments and structural or logical modifications may be made without departing from the scope of this invention. Therefore, the following detailed description is not restrictive, and the scope of this invention is defined by the appended claims.

[0026] Before introducing the embodiments of this utility model, some of the terms involved in this utility model will be explained in order to better understand this utility model.

[0027] The terms "connection" or "coupling" and similar terms used in this invention are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Words such as "a," "a group," or "one" do not indicate a quantity limitation, but rather indicate the presence of at least one.

[0028] The terms "comprising," "including," and similar terms used in this utility model should be understood as open-ended terms, meaning "including / including but not limited to," indicating that other content may also be included. The term "based on" means "at least partially based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and so on. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0029] Figure 1 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown. Figure 1 As shown, the leakage current protection device 100 includes multiple input terminals 101, multiple output terminals 102, a switching module 103, a leakage current detection module 104, a drive module 105, a relay module 106, and a signal processing and communication module 107. The multiple input terminals 101 and multiple output terminals 102 are connected via a set of current-carrying lines and are connected to the power grid at the input terminals 101. Each input terminal 101 corresponds to one or more output terminals 102. Although... Figure 1 The diagram shows two current-carrying lines, each with an input terminal 101 and a corresponding output terminal 102. However, it is understood that a set of current-carrying lines may include more than two current-carrying lines, and / or one input terminal 101 may correspond to more than one output terminal 102. For example, a set of current-carrying lines may include a first current-carrying line connected to the live wire of the power grid and a second current-carrying line connected to the neutral wire of the power grid. A branch line may be branched off from each current-carrying line, thereby giving the residual current device 100 two input terminals 101 and four output terminals 102.

[0030] A switching module 103 is coupled between a plurality of input terminals 101 and a plurality of output terminals 102, and controls the power connection between the plurality of input terminals 101 and the plurality of output terminals 102. A leakage current detection module 104 detects leakage current signals on the set of current-carrying lines and generates a leakage fault signal when a leakage current signal is detected or when the leakage current signal exceeds a preset threshold. A drive module 105 is coupled to the switching module 103 and the leakage current detection module 104, receives the leakage fault signal, and drives the switching module 103 to disconnect the power connection between the plurality of input terminals 101 and the plurality of output terminals 102 in response to the leakage fault signal. A relay module 106 includes a switch coupled between at least one input terminal 101 and at least one corresponding output terminal 102. For example, one input terminal 101 corresponds to two output terminals 102, and the switch may be coupled between that input terminal 101 and one of its two corresponding output terminals 102. The relay module 106 may include a magnetic latching relay or a conventional relay. A magnetic latching relay may have two sets of coils, one for controlling the opening and the other for controlling the closing of the switch. A conventional relay may have one set of coils for controlling the switch to switch from open to closed, or from closed to open. A relay may include two switches, each coupled between an input terminal 101 and at least one corresponding output terminal 102. Relay module 106 may also include two relays, each including a switch, each coupled between an input terminal 101 and at least one corresponding output terminal 102. A signal processing and communication module 107 is coupled to relay module 106 for wireless communication with a remote control device. The remote control device may be any device with wireless communication capabilities, such as a mobile phone, laptop, desktop computer, tablet, console, handheld control device, etc. Wireless communication may include, but is not limited to, WiFi, Bluetooth, Zigbee, NFC, RFID, cellular communication (2G, 3G, 4G, 5G, 6G, etc.). The remote control device may have control software and / or mechanical control switches. The signal processing and communication module 107 can receive a first control command indicating power on / off from a remote control device via wireless communication. Based on the first control command, it controls the relay module 106 to open or close the switch, thereby disconnecting or connecting the power connection between at least one input terminal 101 coupled to the switch and at least one corresponding output terminal 102 when the switch module 103 is closed.

[0031] The leakage current protection device 100 proposed in this embodiment includes a relay module 106 independent of the switch module 13 and a signal processing and communication module 107, thereby enabling remote control equipment to safely and reliably control the power supply of the leakage current protection device 100, avoiding the occurrence of danger, eliminating potential safety hazards, and increasing the safety of the leakage current protection device 100.

[0032] In some embodiments, the leakage current protection device 100 further includes a status detection module ( Figure 1 (Not shown in the diagram) It is coupled to at least one of a plurality of output terminals 102 and a signal processing and communication module 107, and detects the on / off status of the power connection between its coupled output terminal 102 and the corresponding input terminal 101 and generates a connection status detection signal. The status detection module may include an optocoupler and / or a relay. The signal processing and communication module 107 generates a connection status indication signal based on the connection status detection signal and sends it to a remote control device. The signal processing and communication module 107 may send the connection status signal to the remote control device in response to a request from the remote control device, or it may actively send the connection status signal to the remote control device. In this way, the user can view the on / off status of the power connection of the leakage current protection device 100 through the remote control device, so that the user can understand the working status of the leakage current protection device 100 and the electrical appliances connected to it in a timely manner.

[0033] In some embodiments, the leakage current protection device 100 further includes a parameter acquisition module ( Figure 1 (Not shown in the diagram) It is coupled between at least one input terminal 101 and at least one corresponding output terminal 102 and coupled to the signal processing and communication module 107, and acquires the electrical parameters of the leakage current protection device 100. The signal processing and communication module 107 receives the acquired electrical parameters of the leakage current protection device 100, processes the electrical parameters, and sends the processed electrical parameters to a remote control device. The electrical parameters may include, for example, input current, input voltage, power, power factor, and electrical energy. In this way, the user can view the electrical parameters of the leakage current protection device 100 through the remote control device, which facilitates the user to understand the working status of the leakage current protection device 100 and the electrical appliances connected to it in a timely manner.

[0034] In some embodiments, the parameter acquisition module includes a current sensor that acquires the current value on at least one of a set of current-carrying lines and generates a current sampling signal. The current sensor may, for example, include an alloy resistor and / or a current transformer. The signal processing and communication module 107 further includes an operational amplifier and an analog-to-digital converter circuit. The operational amplifier is coupled to the current sensor and amplifies the current sampling signal. The analog-to-digital converter circuit is coupled to the operational amplifier and performs analog-to-digital conversion on the amplified current sampling signal to obtain electrical parameters.

[0035] In some embodiments, the parameter acquisition module includes a rectification unit that rectifies the input voltage at at least one input terminal 101. The rectification unit may include, for example, a rectifier diode. The signal processing and communication module 107 also includes a voltage divider unit and an analog-to-digital converter circuit. The voltage divider unit is coupled to the rectification unit and divides the rectified input voltage. The analog-to-digital converter circuit is coupled to the voltage divider unit and performs analog-to-digital conversion on the divided input voltage to obtain electrical parameters.

[0036] In some embodiments, the residual current device 100 further includes a switch button coupled to the signal processing and communication module 107, which, when a first operation is performed, sends a second control command indicating a wireless connection to the signal processing and communication module 107. Based on this second control command, the signal processing and communication module 107 establishes a wireless connection with a remote control device. The first operation may, for example, be a long press of the switch button. In this way, the user can achieve a wireless connection between the residual current device 100 and the remote control device by operating the switch button, increasing user convenience.

[0037] In some embodiments, the switch button also sends a third control command indicating power on / off to the signal processing and communication module 107 when the second operation is performed. Based on the third control command, the signal processing and communication module 107 controls the relay module 106 to open or close the switch, disconnecting or connecting the power connection between at least one input terminal 101 and at least one corresponding output terminal 102 when the switch module 103 is closed. The second operation may be, for example, a short press of the switch button. In this way, the user can locally control the power connection of the residual current device 100 by operating the switch button, increasing the convenience of use.

[0038] In some embodiments, the residual current device 100 further includes a display module coupled to the signal processing and communication module 107, which displays the network connection status of the signal processing and communication module 107 and / or the on / off status of the power connection between at least one input terminal 101 and a corresponding at least one output terminal 102. In this way, a user can view the network connection status of the signal processing and communication module 107 and / or the on / off status of the power connection of the residual current device 100 or one of its output terminals through the display device.

[0039] In some embodiments, the leakage current protection device 100 further includes a power supply module ( Figure 1(Not shown in the diagram), it is coupled to the leakage current detection module 104, the relay module 106, and the signal processing and communication module 107, and supplies power to the leakage current detection module 104, the relay module 106, and the signal processing and communication module 107. The power supply module can rectify and convert the input voltage at the input terminal to obtain the power supply voltage required by each module. In this way, no external power supply is required to power the leakage current detection module 104, the relay module 106, and the signal processing and communication module 107, increasing the integration and ease of use of the leakage current protection device 100.

[0040] In some embodiments, the leakage current protection device 100 includes a leakage current self-test module ( Figure 1 (Not shown in the diagram) It is coupled to the leakage current detection module 104 and the drive module 105, and periodically generates a simulated leakage current signal to detect whether the leakage current detection module 104 has failed, and generates a self-test fault signal when the leakage current detection module 104 fails. The drive module 105 receives the self-test fault signal and drives the switch module 103 to disconnect the power connection between the multiple input terminals 101 and the multiple output terminals 102 in response to the self-test fault signal. In this way, the leakage current protection device 100 can perform a self-test on the leakage current detection module 104, thereby timely cutting off the power connection when the leakage current detection module 104 fails, improving the safety and reliability of the leakage current protection device 100.

[0041] Figure 2A-2C A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown.

[0042] Also refer to Figure 2A-2C The leakage current protection device 200 includes two input terminals 101 and four output terminals 102, which are connected by a set of current-carrying lines. This set of current-carrying lines includes a first current-carrying line 21, a second current-carrying line, and two branch lines 211 and 221 branching from the first current-carrying line 21 and the second current-carrying line 22, thus each input terminal corresponds to two output terminals. The leakage current protection device 200 also includes a switch module 103, a leakage current detection module 104, a drive module 105, a relay module 106, a signal processing and communication module 107, a status detection module 108, a parameter acquisition module 109, a power supply module 110, a leakage current self-test module 111, and a display module 112.

[0043] Two input terminals 101 are connected to the power grid. A switching module 103 is coupled between multiple input terminals 101 and multiple output terminals 102, used to control the on / off connection of the power between the multiple input terminals 101 and multiple output terminals 102. A leakage current detection module 104 includes a leakage current detection ring CT1, a leakage current detection chip U1, and its peripheral circuitry. A first current-carrying line 21 and a second current-carrying line 22 pass through the leakage current detection ring CT1. A drive module 105 includes switch drive elements, namely solenoids SOL1 and SOL2, and two thyristors Q1 and Q01. The control electrodes of thyristors Q1 and Q01 are connected to pin 5 of the leakage current detection chip U1. In this embodiment, the relay module 106 is a magnetic latching relay with two coils and a switch. The switch is coupled in the first current-carrying line 21, i.e., coupled between the input terminal HOT_I and the corresponding output terminal HOT_L. The input terminals RL_CL and RL_OP of the two coils are respectively connected to the collectors of transistors Q4 and Q3 in the signal processing and communication module 107. The status detection module 108 includes a resistor R3, a diode D2, and an optocoupler U5 connected to them. The other ends of resistor R3 and diode D2 are connected to output terminal 102, and the other end of optocoupler U5 is connected to pin 26 of signal processing and communication module 107 and ground. Signal processing and communication module 107 also includes a wireless communication chip U2, operational amplifier U6, transistors Q3 and Q4, light-emitting diode LED2, and peripheral circuitry. The parameter acquisition module 109 includes a current transformer CT3 through which a second current-carrying line 22 passes, and the current transformer CT3 is connected to the input terminal of operational amplifier U6. Wireless communication chip U2 can establish a wireless connection with a remote control device. Parameter acquisition module 109 also includes a rectifier diode D10 connected to input terminal 101. Power supply module 110 includes a rectifier DB1, rectifier diode D10, AC / DC chip U3, LDO chip U4, and peripheral circuitry connected to input terminal 101. The voltage at input terminal 101 is rectified by rectifier DB1 and supplied to the leakage current detection chip U1, providing it with its operating voltage. The voltage VIN is rectified by rectifier diode D10, and then AC / DC chip U3 performs analog-to-digital conversion to obtain DC voltage VCC, which powers the magnetic latching relay 106. LDO chip U4 processes the DC voltage VCC to generate a 3.3V power supply voltage, powering the wireless communication chip U2 and operational amplifier U6. Simultaneously, through voltage division by resistors R22 and R23, it provides a reference voltage for operational amplifier U6. The leakage current self-test module 111 includes trigger diode ZD1, capacitor C7, silicon controlled rectifier Q2, and some peripheral components. The control electrode of silicon controlled rectifier Q2 is connected to pin 5 of leakage current detection chip U2.

[0044] Under normal circumstances, manually pressing RESET resets the switch module 103, connecting the power supply between multiple input terminals 101 and multiple output terminals 102. Current flows through HOT_I-R7-DB1 to power the leakage current detection chip U1, generating a stable voltage on the power supply pin (pin 6) of the leakage current detection chip U1. When leakage current exists on the first current-carrying line 21 and the second current-carrying line 22, the leakage current detection ring CT1 detects the leakage current signal, generating a corresponding induction signal on its secondary side. The leakage current detection ring CT1 is coupled to the leakage current detection chip U1, transmitting the induction signal to the leakage current detection chip U1 for processing. When the processed leakage current value exceeds a set threshold, pin 5 of the leakage current detection chip U1 outputs a high level (leakage fault signal); otherwise, it outputs a low level. The high level of pin 5 of the leakage current detection chip U1 is provided to the control electrode of the thyristors Q1 and Q01 through diode D4 and resistor R6, triggering the thyristors Q1 and Q01 to conduct. At this time, the current flows to the ground through HOT_I-SOL1 / SOL2-Q1 / Q01, and the solenoids SOL1 / SOL2 generate a large magnetic field, driving the switch module 103 to disconnect the power connection between multiple input terminals 101 and multiple output terminals 102.

[0045] The leakage current protection device 200 also has a leakage current self-test function. Current charges capacitor C7 via HOT_I-D5-R9. As the voltage across capacitor C7 increases, the voltage across trigger diode ZD1 also increases. After a preset time period, the voltage across capacitor C7 exceeds the trigger voltage of trigger diode ZD1, causing ZD1 to conduct. Current flows through trigger diode ZD1-R12-CT1-ground to generate a simulated leakage current signal, while simultaneously charging capacitor C3 via resistor R5. Under normal operating conditions of the leakage current protection device 200, i.e., when both leakage detection module 104 and drive module 105 are working normally, leakage detection ring CT1 detects the simulated leakage current signal. The secondary side generates a corresponding induction signal and transmits it to leakage detection chip U1. Pin 5 of leakage detection chip U1 outputs a high level, current charges capacitor C8 via resistor R6, and simultaneously, current triggers thyristor Q2 to conduct via resistor R11. Capacitor C7 quickly releases its charge through thyristor Q2, and its voltage drops rapidly. When the voltage drops below the trigger voltage of trigger diode ZD1, trigger diode ZD1 is turned off, and therefore cannot generate a simulated leakage current signal. Pin 5 of the leakage current detection chip U1 stops outputting a high level. Due to the short trigger time, the voltage at the lower end of capacitor C3 and the upper end of capacitor C8 are too low to trigger the thyristor Q1 and / or Q01 to conduct, and the switch module 103 remains closed. When the leakage current detection module 104 malfunctions, such as when the leakage current detection ring CT1 is open or short-circuited, the leakage current detection chip U1 is damaged, or the resistor R2 is open, and the analog leakage current signal cannot be detected, pin 5 of the leakage current detection chip U1 remains at a low level, preventing the thyristor Q2 from being turned on. Capacitor C7 cannot release its charge through the thyristor Q2, causing the trigger diode ZD1 to conduct for a prolonged period, resulting in a continuous rise in the voltage at the lower end of capacitor C3 (i.e., generating a self-test fault signal). This continues until the thyristors Q1 / Q01 are triggered to conduct, current flows through solenoids SOL1 / SOL2, generating a large magnetic field that drives the switch module 103 to disconnect the power connection between multiple input terminals 101 and multiple output terminals 102.

[0046] The residual current device 200 also has the function of remotely controlling the power supply. This function is realized when the switch module 103 is closed. For example, a remote control application can be provided. After the user installs the remote control application on their mobile phone or computer, they can select the option to disconnect or connect the power connection of the residual current device 200 in the application. Alternatively, the user can select to disconnect or connect the power connection of the residual current device 200 via a mechanical button on a handheld control device. When the user needs to control the power supply of the residual current device 200, they select the corresponding option in the application installed on the remote control device or issue the corresponding command via the mechanical button. The remote control device generates a first control command indicating the power supply and sends it to the signal processing and communication module 107 of the residual current device 200 via wireless communication. After receiving the first control command, the signal processing and communication module 107 sends a high-level pulse through pin 6 or pin 12 to control the transistor Q3 or Q4 to conduct, thereby controlling the switch of the magnetic latching relay 106, causing the switch to close or open, thus connecting or disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L, that is, connecting or disconnecting the power connection of the entire leakage current protection device 200. Once a leakage fault occurs, the switch module 103 disconnects the power connection between the input terminal 101 and the output terminal 102, and the user can no longer connect the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L through the remote control device, that is, cannot remotely control the power supply of the leakage current protection device 200.

[0047] Specifically, if a user wants to disconnect the power connection of the residual current device 200, they send a first control command to the signal processing and communication module 107 via a remote control device, instructing them to disconnect the power. Upon receiving this first control command, the signal processing and communication module 107 sends a high-level pulse through pin 6 of the wireless communication chip U2, turning on transistor Q3 and energizing the corresponding coil of the magnetic latching relay 106. This generates a magnetic field that drives the switch of the magnetic latching relay 106 to open, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L. If the user wants to reconnect the power connection of the residual current device 200, they send a first control command to the signal processing and communication module 107 via a remote control device, instructing them to reconnect the power. After receiving the first control command, the signal processing and communication module 107 sends a high-level pulse through pin 12 of the wireless communication chip U2, turns on the transistor Q4, energizes the corresponding coil of the magnetic latching relay 106, generates a magnetic field to drive the switch of the magnetic latching relay 106 to close, thereby connecting the power between the input terminal HOT_I and the corresponding output terminal HOT_L.

[0048] By setting a separate relay module 106 in the leakage current protection device 200, the power supply of the leakage current protection device 200 can be controlled independently of the switch module 103, and the power connection of the leakage current protection device 200 cannot be connected when the switch module 103 is disconnected. This avoids connecting the power connection in potentially dangerous situations (such as when a leakage current fault causes the switch module 103 to disconnect), ensuring that the leakage current protection device 200 can be remotely controlled safely and reliably.

[0049] It is understood that, for simplicity, only one relay module 106 is provided in this embodiment. However, in other embodiments, two relay modules can be provided, and their switches can be coupled to two current-carrying lines, that is, between the two input terminals 101 and the corresponding output terminals 102. Alternatively, a dual-switch type relay can be used, with each switch coupled between one input terminal and the corresponding output terminal.

[0050] Users can also remotely obtain the power connection status of the leakage current protection device 200 through remote control equipment. For example... Figure 2B As shown, one end of optocoupler U5 is connected to the two output terminals HOT_L and WHITE_L of the leakage current protection device 200, and the other end is connected to pin 26 of the wireless communication chip U2 and ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_L and WHITE_L, optocoupler U5 is turned on, and the voltage at pin 26 of the wireless communication chip U2 is low (connection status detection signal). When the input terminals HOT_I and WHITE_I are disconnected from the output terminals HOT_L and WHITE_L, optocoupler U5 is turned off, and the pull-up resistor in the wireless communication chip U2 pulls the voltage at pin 26 to a high level. By determining whether the voltage at pin 26 is low or high, the wireless communication chip U2 can determine the on / off state of the power connection between the input terminals HOT_I and WHITE_I and the output terminals HOT_L and WHITE_L, and generate a connection status indication signal. The signal processing and communication module 107 can send a connection status indication signal to the remote control device in response to a request from the remote control device or proactively (such as when the connection status changes).

[0051] Users can also remotely obtain the electrical parameters of the leakage current protection device 200 through a remote control device. These electrical parameters may include, but are not limited to, input current, input voltage, power, power factor, and electrical energy. When current flows through the second current-carrying line 22, the current transformer CT3 generates a corresponding current signal. This current signal is transmitted to the operational amplifier U6 of the signal processing and communication module 107. After being amplified by the operational amplifier U6, it is transmitted to pin 5 of the wireless communication chip U2. After analog-to-digital conversion by the built-in analog-to-digital converter circuit of the wireless communication chip U2, the magnitude of the current on the second current-carrying line 22 is obtained. On the other hand, the input terminal HOT_I is connected to the rectifier diode D10. After the input voltage is rectified by the rectifier diode D10, it is divided by the voltage divider circuit composed of resistors R26 and R27 in the signal processing and communication module 107. The divided voltage is provided to pin 27 of the signal processing and communication module 107. After analog-to-digital conversion by the built-in analog-to-digital converter circuit of the wireless communication chip U2, the magnitude of the input voltage at the input terminal HOT_I is obtained. The signal processing and communication module 107 can also calculate other electrical parameters based on the obtained current and voltage. The signal processing and communication module 107 can send electrical parameters to the remote control device in response to a request from the remote control device or proactively (e.g., at timed intervals or when the magnitude of the electrical parameter reaches a certain threshold).

[0052] In addition, the leakage protection device 200 also includes a switch button KEY1 (see Figure 2B It is connected to pin 16 of the wireless communication chip U2. The wireless communication chip U2 can be configured so that different operations of the switch button KEY1 can achieve different functions.

[0053] In this embodiment, when the switch button KEY1 is subjected to a first operation (such as a long press), a second control command indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control command, the wireless communication chip U2 establishes a wireless connection with the remote control device. When the switch button KEY1 is subjected to a second operation (such as a short press), a third control command indicating power on / off is sent to the signal processing and communication module 107. Based on the third control command and the current state of the magnetic latching relay 106, the signal processing and communication module 107 sends a high-level pulse through pin 6 or 12 to control the transistor Q3 or Q4 to conduct, thereby controlling the switch of the magnetic latching relay 106 to close or open, thus connecting or disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L.

[0054] When the switch of the magnetic latching relay 106 is currently in the closed state, performing a second operation on the switch button KEY1 sends a third control command to the wireless communication chip U2, indicating that the power connection should be disconnected. Pin 6 of the wireless communication chip U2 emits a high-level pulse, turning on transistor Q3, energizing the corresponding coil of the magnetic latching relay 106, generating a magnetic field that drives the switch of the magnetic latching relay 106 to open, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L. When the switch of the magnetic latching relay 106 is currently in the open state, performing a second operation on the switch button KEY1 sends a third control command to the wireless communication chip U2, indicating that the power connection should be reconnected. Pin 12 of the wireless communication chip U2 emits a high-level pulse, turning on transistor Q4, energizing the corresponding coil of the magnetic latching relay 106, generating a magnetic field that drives the switch of the magnetic latching relay 106 to close, thereby reconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L. It is understandable that the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L can only be established by operating the switch button KEY1 when the switch module 103 is closed.

[0055] Furthermore, in this embodiment, the display module 112 includes a light-emitting diode (LED2) connected to pin 13 of the wireless communication chip U2. The wireless communication chip U2 can be configured to display its network connection status and / or the on / off state of the power connection between the input terminal coupled to the switch of the magnetic latching relay 106 and its corresponding output terminal through different display modes of the LED2. For example, a flashing LED2 indicates that the signal processing and communication module 107 is establishing a wireless connection with a remote control device; a constantly lit LED2 indicates that the switch of the magnetic latching relay 106 is closed, and the power connection between its coupled input terminal and its corresponding output terminal is on; an off LED2 indicates that the switch of the magnetic latching relay 106 is open, and the power connection between its coupled input terminal and its corresponding output terminal is off.

[0056] The following is for reference. Figures 3A-3B The leakage current protection device 300 includes two input terminals 101 and four output terminals, which are connected by a set of current-carrying lines. This set of current-carrying lines also includes a first current-carrying line 21, a second current-carrying line 22, and two branch lines 211 and 221 branching from the first current-carrying line 21 and the second current-carrying line 22, thus each input terminal corresponds to two output terminals. Figure 2A Unlike other embodiments, in this embodiment, the switch of the magnetic latching relay 106 is coupled in branch 211, that is, coupled between the input terminal HOT_I and the corresponding output terminal HOT_O. The power supply module 110 of the leakage current protection device 300 is the same as that of the leakage current protection device 200, therefore it can be referred to Figure 2CThe power module 110 shown in the figure and its description are not repeated here.

[0057] The leakage current detection function and leakage current self-test function of the leakage current protection device 300 are the same as those of the leakage current protection device 200, and will not be described again here.

[0058] The residual current device 300 also has the function of remotely controlling the power on / off. This function is also realized when the switch module 103 is closed. Unlike the residual current device 200, in the residual current device 300, the magnetic latching relay 106 is coupled in the branch line 211, thus controlling the on / off of the power connection between its control input terminal HOT_I and the corresponding output terminal HOT_O (i.e., the power connection of the circuit where the branch line 211 is located). For example, a remote control application can be provided, which the user can install on their mobile phone or computer and select the option to disconnect or connect the power connection of the circuit where the branch line 211 is located in the application. Alternatively, the user can select to disconnect or connect the power connection of the circuit where the branch line 211 is located via a mechanical button on a handheld control device. When the user needs to control the power on / off of the circuit where the branch line 211 is located, they select the corresponding option in the application installed on the remote control device or issue the corresponding command via the mechanical button. The remote control device generates a first control command indicating the power on / off and sends it to the signal processing and communication module 107 of the residual current device 300 via wireless communication. After receiving the first control command, the signal processing and communication module 107 sends a high-level pulse through pin 6 or pin 12 to control the transistor Q3 or Q4 to conduct, thereby controlling the switch of the magnetic latching relay 106, causing the switch to close or open, connecting or disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O, that is, connecting or disconnecting the power connection of the circuit where branch 211 is located. However, once a leakage fault occurs, the switch module 103 disconnects the power connection between the input terminal 101 and the output terminal 102, and the user will no longer be able to connect or disconnect the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O through the remote control device, that is, will not be able to remotely control the power supply of the circuit where branch 211 is located.

[0059] Specifically, if a user wants to disconnect the power connection of the circuit containing branch line 211 in the residual current device 300, they send a first control command to the signal processing and communication module 107 via a remote control device to instruct the power to be disconnected. Upon receiving this first control command, the signal processing and communication module 107 sends a high-level pulse through pin 6 of the wireless communication chip U2, turning on transistor Q3 and energizing the corresponding coil of the magnetic latching relay 106. This generates a magnetic field that drives the switch of the magnetic latching relay 106 to open, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O. If the user wants to reconnect the power connection of the circuit containing branch line 211 in the residual current device 300, they send a first control command to the signal processing and communication module 107 via a remote control device to instruct the power to be reconnected. After receiving the first control command, the signal processing and communication module 107 sends a high-level pulse through pin 12 of the wireless communication chip U2, turns on the transistor Q4, energizes the corresponding coil of the magnetic latching relay 106, generates a magnetic field to drive the switch of the magnetic latching relay 106 to close, thereby connecting the power between the input terminal HOT_I and the corresponding output terminal HOT_O.

[0060] By setting a separate relay module 106 in the branch line 211 of the leakage current protection device 300, the power supply of the circuit in which the branch line 211 is located can be controlled independently of the switch module 103. Furthermore, the power supply of the circuit in which the branch line 211 is located cannot be connected when the switch module 103 is disconnected. This avoids connecting the power supply in potentially dangerous situations (such as when the switch module 103 is disconnected due to a leakage fault), ensuring that the leakage current protection device 300 can be remotely controlled safely and reliably.

[0061] It is understood that, for simplicity, only one relay module 106 is provided in this embodiment. However, in other embodiments, two relay modules can be provided, and their switches can be coupled to two branches 211 and 221 respectively, that is, between the two input terminals 101 and the corresponding output terminals HOT_O and WHITE_O. Alternatively, a dual-switch type relay can be used, with each switch coupled between one input terminal and the corresponding output terminal.

[0062] Users can also remotely obtain the power connection status of the leakage current protection device 300 through a remote control device. In this embodiment, such as Figure 3BAs shown, one end of optocoupler U5 is connected to the two output terminals HOT_O and WHITE_O of the leakage current protection device 300, and the other end is connected to pin 27 of the wireless communication chip U2 and ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_O and WHITE_O, optocoupler U5 is turned on, and the voltage at pin 27 of the wireless communication chip U2 is low (connection status detection signal). When the input terminals HOT_I and WHITE_I are disconnected from the output terminals HOT_O and WHITE_O, optocoupler U5 is turned off, and the pull-up resistor in the wireless communication chip U2 pulls the voltage at pin 27 to a high level. By determining whether the voltage at pin 27 is low or high, the wireless communication chip U2 can determine the on / off state of the power connection between the input terminals HOT_I and WHITE_I and the output terminals HOT_O and WHITE_O, and generate a connection status indication signal. The signal processing and communication module 107 can send a connection status indication signal to the remote control device in response to a request from the remote control device or proactively (such as when the connection status changes).

[0063] Users can also remotely obtain the electrical parameters of the leakage current protection device 300 through a remote control device. In this embodiment, the parameter acquisition module 109 includes an alloy resistor connected in series in branch 211 and connected to the operational amplifier U6 of the signal processing and communication module 107. The current signal flowing through the alloy resistor is transmitted to the operational amplifier U6, amplified by the operational amplifier U6, and transmitted to pin 5 of the wireless communication chip U2. After analog-to-digital conversion by the built-in analog-to-digital conversion circuit of the wireless communication chip U2, the magnitude of the current in branch 211 is obtained. In addition, in this embodiment, it is not necessary to obtain the input voltage at the input terminal, so the signal processing and communication module 107 does not include a voltage divider unit. The signal processing and communication module 107 can also calculate other electrical parameters based on the obtained current. The signal processing and communication module 107 can send electrical parameters to the remote control device in response to a request from the remote control device or proactively (such as at regular intervals or when the magnitude of the electrical parameter reaches a certain threshold).

[0064] Similar to the residual current device 200, the residual current device 300 also includes a switch button KEY1 (see Figure 3B It is connected to pin 16 of the wireless communication chip U2. The wireless communication chip U2 can be configured so that different operations of the switch button KEY1 can achieve different functions.

[0065] In this embodiment, when the switch button KEY1 is subjected to a first operation (such as a long press), a second control command indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control command, the wireless communication chip U2 establishes a wireless connection with the remote control device. When the switch button KEY1 is subjected to a second operation (such as a short press), a third control command indicating power on / off is sent to the signal processing and communication module 107. Based on the third control command and the current state of the magnetic latching relay 106, the signal processing and communication module 107 sends a high-level pulse through pin 6 or 12 to control the transistor Q3 or Q4 to conduct, thereby controlling the switch of the magnetic latching relay 106 to close or open, thus connecting or disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O.

[0066] When the switch of the magnetic latching relay 106 is currently in the closed state, performing a second operation on the switch button KEY1 sends a third control command to the wireless communication chip U2, indicating that the power connection should be disconnected. Pin 6 of the wireless communication chip U2 emits a high-level pulse, turning on transistor Q3, energizing the corresponding coil of the magnetic latching relay 106, generating a magnetic field that drives the switch of the magnetic latching relay 106 to open, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O. When the switch of the magnetic latching relay 106 is currently in the open state, performing a second operation on the switch button KEY1 sends a third control command to the wireless communication chip U2, indicating that the power connection should be reconnected. Pin 12 of the wireless communication chip U2 emits a high-level pulse, turning on transistor Q4, energizing the corresponding coil of the magnetic latching relay 106, generating a magnetic field that drives the switch of the magnetic latching relay 106 to close, thereby reconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O. It is understandable that the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O can only be established by operating the switch button KEY1 when the switch module 103 is closed.

[0067] In addition, the leakage current protection device 300 also includes a display module 112, the function of which is the same as that of the display module 112 in the leakage current protection device 200, and will not be described again here.

[0068] The following is for reference. Figures 4A-4B The leakage current protection device 400 includes two input terminals 101 and two output terminals 102, which are connected by a set of current-carrying lines. This set of current-carrying lines includes a first current-carrying line 21 and a second current-carrying line 22, with each input terminal corresponding to one output terminal. Figure 3AUnlike other embodiments, in this embodiment, the relay module 106 includes a conventional relay whose switch is coupled in the second current-carrying line 22, i.e., coupled between the input terminal WHITE_I and the corresponding output terminal WHITE_O. The relay 106 has only one coil, is driven by a level, and is connected to the collector of transistor Q3 in the signal processing and communication module 107. The relay 106 may have normally open or normally closed contacts. The power supply module 110 of the leakage current protection device 400 is the same as that of the leakage current protection device 200, and therefore can be referred to... Figure 2C The power module 110 shown in the figure and its description are not repeated here.

[0069] The leakage current detection function and leakage current self-test function of the leakage current protection device 400 are the same as those of the leakage current protection devices 200 and 300, and will not be described again here.

[0070] The residual current device 400 also has the function of remotely controlling the power on / off. This function is also realized when the switch module 103 is closed. Unlike the residual current device 300, in the residual current device 400, the relay 106 is coupled in the second current-carrying line 22, thus controlling the on / off of the power connection between its control input terminal WHITE_I and the corresponding output terminal WHITE_O. For example, a remote control application can be provided, which the user can install on their mobile phone or computer and select the option to disconnect or connect the power connection of the residual current device 400 in the application. Alternatively, the user can select to disconnect or connect the power connection of the residual current device 400 via a mechanical button on a handheld control device. When the user needs to control the power on / off of the residual current device 400, they select the corresponding option in the application installed on the remote control device or issue the corresponding command via the mechanical button. The remote control device generates a first control command indicating the power on / off and sends it to the signal processing and communication module 107 of the residual current device 400 via wireless communication. After receiving the first control command, the signal processing and communication module 107 sends a high-level signal through pin 6 to control the transistor Q3 to conduct, thereby controlling the switch of the relay 106 to close or open, thus connecting or disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O, i.e., connecting or disconnecting the power connection of the leakage current protection device 400. However, once a leakage fault occurs, the switch module 103 disconnects the power connection between the input terminal 101 and the output terminal 102, and the user can no longer connect or disconnect the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O via remote control equipment, meaning the power supply to the leakage current protection device 400 cannot be switched on or off.

[0071] Specifically, when relay 106 has normally open contacts, if a user wants to connect the power to the leakage current protection device 400, they send a first control command to the signal processing and communication module 107 via a remote control device to indicate power connection. Upon receiving this first control command, the signal processing and communication module 107 sends a high-level signal through pin 6 of the wireless communication chip U2, turning on transistor Q3 and energizing the coil of relay 106. This generates a magnetic field that drives the switch of relay 106 to close, thereby connecting the power between the input terminal WHITE_I and the corresponding output terminal WHITE_O. If the user wants to disconnect the power to the leakage current protection device 400 again, they send a first control command to the signal processing and communication module 107 via a remote control device to indicate power disconnection. After receiving the first control command, the signal processing and communication module 107 sends a low level through pin 6 of the wireless communication chip U2, the transistor Q3 is turned off, the coil of the relay 106 is de-energized, the switch of the relay 106 is opened, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O.

[0072] When relay 106 has normally closed contacts, if a user wants to disconnect the power connection of the leakage current protection device 400, they send a first control command to the signal processing and communication module 107 via a remote control device to instruct the power to be disconnected. Upon receiving this first control command, the signal processing and communication module 107 sends a high-level signal through pin 6 of the wireless communication chip U2, turning on transistor Q3, energizing the coil of relay 106, generating a magnetic field that drives the switch of relay 106 to open, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. If the user wants to reconnect the power connection of the leakage current protection device 400, they send a first control command to the signal processing and communication module 107 via a remote control device to instruct the power to be reconnected. Upon receiving this first control command, the signal processing and communication module 107 sends a low-level signal through pin 6 of the wireless communication chip U2, turning off transistor Q3, de-energizing the coil of relay 106, closing the switch of relay 106, thereby reconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O.

[0073] It is understood that, for simplicity, only one relay module 106 is provided in this embodiment. However, in other embodiments, two relay modules can be provided, and their switches can be coupled to the first current-carrying line 21 and the second current-carrying line 22, respectively, that is, between each input terminal and its corresponding output terminal. Alternatively, a dual-switch type relay can be used, with each switch coupled between one input terminal and its corresponding output terminal.

[0074] Users can also remotely obtain the power connection status of the leakage current protection device 400 through a remote control device. In this embodiment, such as Figure 4B As shown, one end of optocoupler U5 is connected to the two output terminals HOT_O and WHITE_O of the leakage current protection device 400, and the other end is connected to pin 27 of the wireless communication chip U2 and ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_O and WHITE_O, optocoupler U5 is turned on, and the voltage at pin 27 of the wireless communication chip U2 is low (connection status detection signal). When the input terminals HOT_I and WHITE_I are disconnected from the output terminals HOT_O and WHITE_O, optocoupler U5 is turned off, and the pull-up resistor in the wireless communication chip U2 pulls the voltage at pin 27 to a high level. By determining whether the voltage at pin 27 is low or high, the wireless communication chip U2 can determine the on / off state of the power connection between the input terminals HOT_I and WHITE_I and the output terminals HOT_O and WHITE_O, and generate a connection status indication signal. The signal processing and communication module 107 can send a connection status indication signal to the remote control device in response to a request from the remote control device or proactively (such as when the connection status changes).

[0075] Users can also remotely obtain the electrical parameters of the leakage current protection device 400 through a remote control device. In this embodiment, the parameter acquisition module 109 includes an alloy resistor connected in series in the second current-carrying line 22 and connected to the operational amplifier U6 of the signal processing and communication module 107. The current signal flowing through the alloy resistor is transmitted to the operational amplifier U6, amplified by the operational amplifier U6, and transmitted to pin 5 of the wireless communication chip U2. After analog-to-digital conversion by the built-in analog-to-digital conversion circuit of the wireless communication chip U2, the magnitude of the current on the second current-carrying line 22 is obtained. In addition, in this embodiment, it is not necessary to obtain the input voltage at the input terminal, so the signal processing and communication module 107 does not include a voltage divider unit. The signal processing and communication module 107 can also calculate other electrical parameters based on the obtained current. The signal processing and communication module 107 can send electrical parameters to the remote control device in response to a request from the remote control device or proactively (such as at regular intervals or when the magnitude of the electrical parameter reaches a certain threshold).

[0076] Similar to residual current devices 200 and 300, residual current device 400 also includes a switch button KEY1 (see Figure 4B It is connected to pin 16 of the wireless communication chip U2. The wireless communication chip U2 can be configured so that different operations of the switch button KEY1 can achieve different functions.

[0077] In this embodiment, when the switch button KEY1 is subjected to a first operation (such as a long press), a second control command indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control command, the wireless communication chip U2 establishes a wireless connection with the remote control device. When the switch button KEY1 is subjected to a second operation (such as a short press), a third control command indicating power on / off is sent to the signal processing and communication module 107. Based on the third control command and the current state of the relay 106 switch, the signal processing and communication module 107 sends a high level through pin 6 to control the transistor Q3 to conduct, thereby controlling the switch of the relay 106 to close or open, thereby connecting or disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O, that is, connecting or disconnecting the power connection of the leakage current protection device 400.

[0078] When relay 106 has normally open contacts, and the switch of relay 106 is currently in the open state, performing a second operation on switch button KEY1 sends a third control command to wireless communication chip U2, indicating that the power connection is connected. Pin 6 of wireless communication chip U2 outputs a high level, transistor Q3 conducts, energizing the coil of relay 106 and generating a magnetic field that drives the switch of relay 106 to close, thereby connecting the power connection between input terminal WHITE_I and the corresponding output terminal WHITE_O. When the switch of relay 106 is currently in the closed state, performing a second operation on switch button KEY1 sends a third control command to wireless communication chip U2, indicating that the power connection is disconnected. Pin 6 of wireless communication chip U2 outputs a low level, transistor Q3 is turned off, de-energizing the coil of relay 106, opening the switch of relay 106, thereby disconnecting the power connection between input terminal WHITE_I and the corresponding output terminal WHITE_O. It is understandable that the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O can only be established by operating the switch button KEY1 when the switch module 103 is closed.

[0079] When relay 106 has normally closed contacts, and the switch of relay 106 is currently in the closed state, performing a second operation on switch button KEY1 sends a third control command to wireless communication chip U2, indicating that the power connection should be disconnected. Pin 6 of wireless communication chip U2 outputs a high level, transistor Q3 conducts, energizing the coil of relay 106 and generating a magnetic field that drives the switch of relay 106 to open, thereby disconnecting the power connection between input terminal WHITE_I and the corresponding output terminal WHITE_O. When the switch of relay 106 is currently in the open state, performing a second operation on switch button KEY1 sends a third control command to wireless communication chip U2, indicating that the power connection should be reconnected. Pin 6 of wireless communication chip U2 outputs a low level, transistor Q3 is cut off, de-energizing the coil of relay 106, closing the switch of relay 106, thereby reconnecting the power connection between input terminal WHITE_I and the corresponding output terminal WHITE_O. It is understandable that the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O can only be established by operating the switch button KEY1 when the switch module 103 is closed.

[0080] In addition, the leakage current protection device 400 also includes a display module 112, which has the same function as the display module 112 in the leakage current protection devices 200 and 300, and will not be described again here.

[0081] The present invention also proposes an electrical connection device, comprising: a housing; and a leakage current protection device according to any of the above embodiments, the leakage current protection device being housed in the housing.

[0082] In addition, this utility model also proposes an electrical appliance, including: a load device; and an electrical connection device coupled to the load device for supplying power to the load device, wherein the electrical connection device includes a leakage protection device of any one of the above embodiments.

[0083] 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. An electric leakage protection device, characterized by, The leakage protection device comprises: a plurality of input terminals and a plurality of output terminals connected by a set of current-carrying lines, each input terminal corresponding to one or more output terminals; a switch module coupled between the plurality of input terminals and the plurality of output terminals and configured to control the power connection between the plurality of input terminals and the plurality of output terminals; a leakage detection module configured to detect a leakage current signal on the set of current-carrying lines and generate a leakage fault signal when the leakage current signal is detected or exceeds a preset threshold; a driving module coupled to the switch module and the leakage detection module and configured to receive the leakage fault signal and drive the switch module to disconnect the power connection between the plurality of input terminals and the plurality of output terminals in response to the leakage fault signal; a relay module comprising a switch coupled between at least one input terminal and a corresponding at least one output terminal; and a signal processing and communication module coupled to the relay module and configured to wirelessly communicate with a remote control device and receive a first control instruction indicating the on-off of power from the remote control device, and based on the first control instruction, control the relay module to open or close the switch, thereby disconnecting or connecting the power connection between the at least one input terminal and the corresponding at least one output terminal when the switch module is closed.

2. The ground fault protection device of claim 1, wherein, The leakage protection device further comprises: a state detection module coupled to at least one of the plurality of output terminals and the signal processing and communication module, and configured to detect the on-off state of the power connection between the coupled output terminal and the corresponding input terminal, and generate a connection state detection signal, and the signal processing and communication module is further configured to generate a connection state indication signal based on the connection state detection signal and send it to the remote control device.

3. The ground fault protection device of claim 2, wherein, The state detection module comprises an optoelectronic coupler and / or a relay.

4. The leakage protection device according to claim 1 or 2, characterized in that, The leakage protection device further comprises: a parameter acquisition module coupled between at least one input terminal and a corresponding at least one output terminal and coupled to the signal processing and communication module, and configured to acquire electrical parameters of the leakage protection device, and the signal processing and communication module is further configured to receive the acquired electrical parameters of the leakage protection device, process the electrical parameters, and send the processed electrical parameters to the remote control device.

5. The ground fault protection device of claim 4, wherein, The parameter acquisition module comprises: a current sensor configured to collect the current value on at least one current-carrying line in the set of current-carrying lines and generate a current sampling signal, and the signal processing and communication module further comprises: an operational amplifier coupled to the current sensor and configured to amplify the current sampling signal; and an analog-to-digital conversion circuit coupled to the operational amplifier and configured to perform analog-to-digital conversion on the amplified current sampling signal as the electrical parameters.

6. The ground fault protection device of claim 5, wherein, The current sensor comprises an alloy resistor and / or a current transformer.

7. The ground fault protection device of claim 4, wherein, The parameter acquisition module comprises: a rectification unit configured to rectify an input voltage of the at least one input terminal, and the signal processing and communication module further comprises: a voltage division unit coupled to the rectification unit and configured to divide the rectified input voltage; and an analog-to-digital conversion circuit coupled to the voltage division unit and configured to convert the divided input voltage into an analog-to-digital signal as the electrical parameter.

8. The ground fault protection device of claim 1, wherein, the leakage protection device further comprises: a switch button coupled to the signal processing and communication module and configured to send, when a first operation is implemented, a second control instruction indicating wireless connection to the signal processing and communication module, and the signal processing and communication module is further configured to establish wireless connection with the remote control device based on the second control instruction.

9. The ground fault protection device of claim 8, wherein, the switch button is further configured to send, when a second operation is implemented, a third control instruction indicating power on-off to the signal processing and communication module, and the signal processing and communication module is further configured to control the relay module to open or close the switch based on the third control instruction, thereby opening or closing the power connection between the at least one input terminal and the corresponding at least one output terminal when the switch module is closed.

10. The ground fault protection device of claim 1 or 2, wherein, the leakage protection device further comprises: a display module coupled to the signal processing and communication module and configured to display the network connection state of the signal processing and communication module and / or the on-off state of the power connection between the at least one input terminal and the corresponding at least one output terminal.

11. The ground fault protection device of claim 1, wherein, the relay module comprises a magnetic latching relay.

12. The ground fault protection device of claim 11, wherein, the magnetic latching relay has two groups of coils.

13. The ground fault protection device of claim 1, wherein, the leakage protection device further comprises: a power supply module coupled to the leakage detection module, the relay module, and the signal processing and communication module, and configured to supply power to the leakage detection module, the relay module, and the signal processing and communication module.

14. The ground fault protection device of claim 1, wherein, the leakage protection device further comprises: a leakage self-checking module coupled to the leakage detection module and the driving module, and configured to periodically generate an analog leakage current signal to detect whether the leakage detection module fails, and generate a self-checking failure signal when the leakage detection module fails, and the driving module is further configured to receive the self-checking failure signal and drive the switch module to disconnect the power connection between the plurality of input terminals and the plurality of output terminals in response to the self-checking failure signal.

15. An electrical connection device, characterized by the electrical connection device comprises: a housing; and the leakage protection device according to any one of claims 1-14 is accommodated in the housing.

16. An electrical appliance, characterized by the electrical load comprises: a load device; and the electrical connection device according to claim 15 is coupled to the load device to supply power to the load device.

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