Earth leakage protection device, electric connection equipment and electric appliance

Abstract

The invention provides an electric leakage protection device which comprises 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 an electric leakage fault signal to drive the switch module to disconnect the power connection between the plurality of input ends and the plurality of output ends; 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. The electric leakage protection device can be remotely controlled safely and reliably.

Description

Technical Field

[0001] The invention relates to the electrical field, and in particular to a leakage protection device, an electrical connection device and an electrical appliance. Background Art

[0002] With the development of society, the number of household appliances has increased and the degree of intelligence of appliances has deepened. There is an increasing demand for leakage protection devices that are both safe enough and can be remotely viewed and remotely controlled. At present, the existing leakage protection devices can only simply realize the leakage protection function, but cannot be remotely controlled or remotely viewed. When the user is not near the household appliance, it is impossible to know the working status of the household appliance, such as whether it is working normally or malfunctioning, and it is impossible to remotely control the power on and off of the household appliance safely and reliably as needed. Summary of the invention

[0003] Based on the above problems, the first aspect of the present invention proposes a leakage protection device, comprising: a plurality of input terminals and a plurality of output terminals, connected by a group of current-carrying lines, each input terminal corresponding to one or more output terminals; a switch module, which is coupled between the plurality of input terminals and the plurality of output terminals and is configured to control the power connection between the plurality of input terminals and the plurality of output terminals; a leakage detection module, which is configured to detect a leakage current signal on the group of current-carrying lines and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold; a driving module, which is coupled to the switch module and the leakage detection module and is configured to receive the leakage fault signal. signal, and in response to the leakage fault signal, drives the switch module to disconnect the power connection between the multiple input terminals and the multiple output terminals; a relay module, which includes a switch, and the switch is coupled between at least one input terminal and the corresponding at least one output terminal; and a signal processing and communication module, which is coupled to the relay module and is configured to wirelessly communicate with a remote control device and receive a first control instruction indicating power on and off from the remote control device, and based on the first control instruction, control the relay module to open or close the switch, and then disconnect or connect 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 protection device also includes: a status detection module, which is coupled to at least one of the multiple output terminals and the signal processing and communication module, and is configured to detect the on / off state of the power connection between the output terminal coupled thereto and the corresponding input terminal and generate a connection status detection signal, and the signal processing and communication module is also 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 status detection module includes a photocoupler and / or a relay.

[0006] In some embodiments, the leakage protection device also includes: a parameter acquisition module, which is coupled between at least one input terminal and at least one corresponding output terminal and coupled to the signal processing and communication module, and is 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.

[0007] In some embodiments, the parameter acquisition module includes: a current sensor, which is configured to collect the current value on at least one current-carrying line in the group of current-carrying lines and generate a current sampling signal, and the signal processing and communication module also includes: an operational amplifier, which is coupled to the current sensor and configured to amplify the current sampling signal; and an analog-to-digital conversion circuit, which is coupled to the operational amplifier and configured to perform analog-to-digital conversion on the amplified current sampling signal 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 rectification unit, which is configured to rectify the input voltage of the at least one input terminal, and the signal processing and communication module also includes: a voltage divider unit, which is coupled to the rectification unit and configured to divide the rectified input voltage; and an analog-to-digital conversion circuit, which is coupled to the voltage divider unit and configured to perform analog-to-digital conversion on the divided input voltage as the electrical parameter.

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

[0011] In some embodiments, the switch button is also configured to send a third control instruction indicating power on or off to the signal processing and communication module when a second operation is implemented, and the signal processing and communication module is also configured to: based on the third control instruction, control the relay module to open or close the switch, and then disconnect or connect 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 protection device also includes: a display module, which is coupled to the signal processing and communication module and is 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 protection device also includes: a power supply module, which is coupled to the leakage detection module, the relay module and the signal processing and communication module, and is configured to supply power to the leakage detection module, the relay module and the signal processing and communication module.

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

[0017] The leakage protection device provided in the first aspect of the present invention includes a relay module independent of the switch module and a signal processing and communication module, so that the remote control device can safely and reliably control the power on and off of the leakage protection device, avoid the occurrence of danger, eliminate potential safety hazards, and increase the safety of the leakage protection device.

[0018] A second aspect of the present invention provides an electrical connection device, comprising: a housing; and a leakage protection device according to any one of the embodiments of the first aspect, wherein the leakage protection device is accommodated in the housing.

[0019] A third aspect of the present 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments are shown and explained with reference to the accompanying drawings. These drawings are used to illustrate the basic principles, and only the aspects necessary for understanding the basic principles are shown. These drawings are not to scale. In the drawings, the same reference numerals represent similar features. In addition, the connection between each box in the architecture diagram indicates that the two boxes are electrically coupled, and the absence of a connection between the two boxes does not mean that the two boxes are not coupled.

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

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

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

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

[0025] In the following specific description of the preferred embodiments, reference will be made to the attached drawings which constitute a part of the present invention. The attached drawings show by way of example specific embodiments that can implement the present invention. The illustrative embodiments are not intended to be exhaustive of all embodiments according to the present invention. It will be appreciated that other embodiments may be utilized, and structural or logical modifications may also be made without departing from the scope of the present invention. Therefore, the following specific description is not restrictive, and the scope of the present invention is limited by the appended claims.

[0026] Before introducing the embodiments of the present invention, some terms involved in the present invention are first explained to facilitate a better understanding of the present invention.

[0027] The terms "connection" or "coupling" and similar terms used in the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A", "a group" or "an" and similar words do not indicate a quantity limitation, but indicate the presence of at least one.

[0028] The terms "include", "comprising" and similar terms used in the present invention should be understood as open terms, that is, "including / includes but not limited to", indicating that other contents may also be included. The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment" and so on. In this specification, the schematic 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 a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] Figure 1 FIG. 2 shows a schematic structural diagram of a leakage protection device according to an embodiment of the present invention. Figure 1 As shown in FIG. 1 , the leakage protection device 100 includes a plurality of input terminals 101, a plurality of output terminals 102, a switch module 103, a leakage detection module 104, a drive module 105, a relay module 106, and a signal processing and communication module 107. The plurality of input terminals 101 and the plurality of output terminals 102 are connected through a set of current-carrying wires and connected to the power grid at the input terminal 101. Each input terminal 101 corresponds to one or more output terminals 102. Although Figure 1 Two current-carrying lines are shown in the figure, and each current-carrying line has an input terminal 101 and a corresponding output terminal 102, but it can be understood that a group of current-carrying lines can also include more than two current-carrying lines, and / or one input terminal 101 can correspond to more than one output terminal 102. For example, a group of current-carrying lines includes a first current-carrying line connected to the live line of the power grid and a second current-carrying line connected to the neutral line of the power grid, and a branch line can be respectively separated from each current-carrying line, so that the leakage protection device 100 has two input terminals 101 and four output terminals 102.

[0030] The switch module 103 is coupled between the plurality of input terminals 101 and the plurality of output terminals 102, and controls the power connection between the plurality of input terminals 101 and the plurality of output terminals 102. The leakage detection module 104 detects the leakage current signal on the group of current-carrying wires, and generates a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold. The driving module 105 is coupled to the switch module 103 and the leakage detection module 104, receives the leakage fault signal, and drives the switch 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. The relay module 106 includes a switch, which is 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 can be coupled between the input terminal 101 and one of the two corresponding output terminals 102. The relay module 106 can include a magnetic latching relay or a conventional relay. The magnetic latching relay may have two sets of coils, which are used to control the opening and closing of the switch. A conventional relay may have a set of coils, which are used to control the switch from opening to closing, or from closing to opening. A relay may include two switches, each switch coupled between an input terminal 101 and a corresponding at least one output terminal 102. The relay module 106 may also include two relays, each relay including a switch, each switch coupled between an input terminal 101 and a corresponding at least one output terminal 102. The signal processing and communication module 107 is coupled to the relay module 106 and wirelessly communicates with the remote control device. The remote control device may be any device with wireless communication function, such as a mobile phone, a laptop, a desktop, a tablet device, a console, a 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 instruction indicating power on or off from a remote control device via wireless communication, and based on the first control instruction, control 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 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, so that the remote control device can safely and reliably control the power on and off of the leakage protection device 100, avoid the occurrence of danger, eliminate potential safety hazards, and increase the safety of the leakage protection device 100.

[0032] In some embodiments, the leakage protection device 100 further includes a state detection module ( Figure 1 The signal processing and communication module 107 is not shown in the figure, which is coupled to at least one of the multiple output terminals 102 and the signal processing and communication module 107, and detects the on-off state of the power connection between the output terminal 102 to which it is coupled and the corresponding input terminal 101 and generates a connection state detection signal. The state detection module may include a photocoupler and / or a relay. The signal processing and communication module 107 generates a connection state indication signal based on the connection state detection signal and sends it to the remote control device. The signal processing and communication module 107 can send the connection state signal to the remote control device in response to a request from the remote control device, or it can actively send the connection state signal to the remote control device. In this way, the user can view the on-off state of the power connection of the leakage protection device 100 through the remote control device, so that the user can promptly understand the working conditions of the leakage protection device 100 and the electrical appliances connected thereto.

[0033] In some embodiments, the leakage protection device 100 further includes a parameter acquisition module ( Figure 1 The remote control device 100 includes a signal processing module 107 (not shown), which is coupled between at least one input terminal 101 and at least one corresponding output terminal 102 and is coupled to the signal processing and communication module 107, and obtains the electrical parameters of the leakage protection device 100. The signal processing and communication module 107 receives the obtained electrical parameters of the leakage protection device 100, processes the electrical parameters, and sends the processed electrical parameters to the remote control device. The electrical parameters may include, for example, input current, input voltage, power, power factor, electric energy, etc. In this way, the user can view the electrical parameters of the leakage protection device 100 through the remote control device, so that the user can timely understand the working conditions of the leakage protection device 100 and the electrical appliances connected thereto.

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

[0035] In some embodiments, the parameter acquisition module includes a rectifier unit that rectifies the input voltage of at least one input terminal 101. The rectifier 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 conversion circuit. The voltage divider unit is coupled to the rectifier unit and divides the rectified input voltage. The analog-to-digital conversion circuit is coupled to the voltage divider unit and performs analog-to-digital conversion on the divided input voltage as an electrical parameter.

[0036] In some embodiments, the leakage protection device 100 further includes a switch button, which is coupled to the signal processing and communication module 107, and when the first operation is implemented, sends a second control instruction indicating a wireless connection to the signal processing and communication module 107. The signal processing and communication module 107 establishes a wireless connection with the remote control device based on the second control instruction. The first operation may be, for example, long pressing the switch button. In this way, the user can realize the wireless connection between the leakage protection device 100 and the remote control device by operating the switch button, which increases the convenience of the user.

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

[0038] In some embodiments, the leakage protection device 100 further includes a display module, which is coupled to the signal processing and communication module 107 and 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 the corresponding at least one output terminal 102. In this way, the 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 leakage protection device 100 or one of its output terminals through the display device.

[0039] In some embodiments, the leakage protection device 100 further includes a power module ( Figure 1The power supply module 100 is a power supply module (not shown), which is coupled to the leakage detection module 104, the relay module 106, and the signal processing and communication module 107, and supplies power to the leakage 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 end to obtain the power supply voltage required by each module. In this way, there is no need for an external power supply to supply power to the leakage detection module 104, the relay module 106, and the signal processing and communication module 107, which increases the integration and convenience of use of the leakage protection device 100.

[0040] In some embodiments, the leakage protection device 100 includes a leakage self-detection module ( Figure 1 104 and the driving module 105, and generates a simulated leakage current signal periodically to detect whether the leakage detection module 104 fails, and generates a self-test fault signal when the leakage detection module 104 fails. The driving 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 protection device 100 can perform self-test on the leakage detection module 104, so as to cut off the power connection in time when the leakage detection module 104 fails, thereby improving the safety and reliability of the leakage protection device 100.

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

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

[0043] The two input terminals 101 are connected to the power grid. The switch module 103 is coupled between the multiple input terminals 101 and the multiple output terminals 102, and is used to control the power connection between the multiple input terminals 101 and the multiple output terminals 102. The leakage detection module 104 includes a leakage detection ring CT1, a leakage detection chip U1 and its peripheral circuits. The first current-carrying line 21 and the second current-carrying line 22 pass through the leakage detection ring CT1. The drive module 105 includes a switch drive element, namely, solenoids SOL1 and SOL2 and two thyristors Q1 and Q01. The control electrodes of the thyristors Q1 and Q01 are connected to the pin 5 of the leakage detection chip U1. In this embodiment, the relay module 106 is a magnetic latching relay, which has two coils and a switch, and the switch is coupled in the first current-carrying line 21, that is, 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 state detection module 108 includes a resistor R3, a diode D2, and a photocoupler U5 connected thereto. The other ends of the resistor R3 and the diode D2 are respectively connected to the output terminal 102, and the other end of the photocoupler U5 is connected to the pin 26 and the ground of the signal processing and communication module 107. The signal processing and communication module 107 also includes a wireless communication chip U2, an operational amplifier U6, transistors Q3 and Q4, a light emitting diode LED2, and peripheral circuits. The parameter acquisition module 109 includes a current transformer CT3, through which the second current-carrying line 22 passes, and the current transformer CT3 is connected to the input end of the operational amplifier U6. The wireless communication chip U2 can establish a wireless connection with the remote control device. The parameter acquisition module 109 also includes a rectifier diode D10 connected to the input terminal 101. The power supply module 110 includes a rectifier DB1 connected to the input terminal 101, a rectifier diode D10, an AC / DC chip U3, an LDO chip U4, and peripheral circuits. The voltage at the input terminal 101 is rectified by the rectifier DB1 and provided to the leakage detection chip U1 to provide a working voltage for it; the voltage VIN is rectified by the rectifier diode D10, and the AC / DC chip U3 performs analog-to-digital conversion to obtain a DC voltage VCC to power the magnetic latching relay 106. The LDO chip U4 processes the DC voltage VCC to generate a 3.3V power supply voltage to power the wireless communication chip U2 and the operational amplifier U6, and at the same time divides the voltage through resistors R22 and R23 to provide a reference voltage for the operational amplifier U6. The leakage self-detection module 111 includes a trigger diode ZD1, a capacitor C7, a thyristor Q2 and some peripheral components. The control electrode of the thyristor Q2 is connected to the pin 5 of the leakage detection chip U2.

[0044] Under normal circumstances, manually press RESET, the switch module 103 is reset, and the power connection between the multiple input terminals 101 and the multiple output terminals 102 is connected. The current powers the leakage detection chip U1 through HOT_I-R7-DB1, and generates a stable voltage at the power pin (pin 6) of the leakage detection chip U1. When there is leakage current on the first current-carrying line 21 and the second current-carrying line 22, the leakage detection ring CT1 detects the leakage current signal, and the secondary end generates a corresponding induction signal. The leakage detection ring CT1 is coupled to the leakage detection chip U1, and the induction signal is transmitted to the leakage detection chip U1 for processing. When the value of the processed leakage current is greater than the set threshold, pin 5 of the leakage detection chip U1 sends a high level (leakage fault signal), otherwise it outputs a low level. The high level of pin 5 of the leakage detection chip U1 is provided to the control electrode of the thyristor Q1 and Q01 via the diode D4 and the resistor R6, triggering the thyristor Q1 and Q01 to turn on. At this time, the current flows into the ground through HOT_I-SOL1 / SOL2-Q1 / Q01, and the solenoid SOL1 / SOL2 generates a large magnetic field, driving the switch module 103 to disconnect the power connection between the multiple input terminals 101 and the multiple output terminals 102.

[0045] The leakage protection device 200 also has a leakage self-detection function. The current charges the capacitor C7 through HOT_I-D5-R9. As the voltage at the upper end of the capacitor C7 increases, the voltage at both ends of the trigger diode ZD1 increases accordingly. After a preset period of time, the voltage at the upper end of the capacitor C7 exceeds the trigger voltage of the trigger diode ZD1, the trigger diode ZD1 is turned on, and the current generates a simulated leakage current signal through the trigger diode ZD1-R12-CT1-ground, and charges the capacitor C3 through the resistor R5. In the normal working state of the leakage protection device 200, that is, the leakage detection module 104 and the driving module 105 are both working normally, the leakage detection ring CT1 detects the simulated leakage current signal, and its secondary end generates a corresponding induction signal and transmits it to the leakage detection chip U1. The pin 5 of the leakage detection chip U1 outputs a high level, and the current charges the capacitor C8 through the resistor R6. At the same time, the current triggers the thyristor Q2 to turn on through the resistor R11, and the capacitor C7 quickly releases the electricity through the thyristor Q2, and the upper end voltage decreases rapidly. When it drops to a voltage lower than the trigger voltage of the trigger diode ZD1, the trigger diode ZD1 is cut off, and no analog leakage current signal can be generated, and the pin 5 of the leakage detection chip U1 stops outputting a high level. Due to the short trigger time, the lower end voltage of the capacitor C3 and the upper end voltage of C8 are low at this time, which are not enough to trigger the thyristor Q1 and / or Q01 to turn on, and the switch module 103 remains in a closed state. When the leakage detection module 104 fails, for example, the leakage detection loop CT1 is open or short-circuited, the leakage detection chip U1 is damaged, the resistor R2 is open, etc., and the simulated leakage current signal cannot be detected, the pin 5 of the leakage detection chip U1 remains at a low level, and the thyristor Q2 cannot be triggered to turn on. The capacitor C7 cannot release the electricity through the thyristor Q2, and the trigger diode ZD1 is turned on for a long time, so that the voltage at the lower end of the capacitor C3 continues to rise (i.e., a self-test fault signal is generated) until the thyristor Q1 / Q01 is triggered to turn on, and current flows through the solenoid SOL1 / SOL2, generating a large magnetic field, driving the switch module 103 to disconnect the power connection between the multiple input terminals 101 and the multiple output terminals 102.

[0046] The leakage protection device 200 also has the function of remotely controlling the power on and off. 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 his mobile phone or computer, he selects the option of disconnecting or connecting the power connection of the leakage protection device 200 in the application. For another example, the user can choose to disconnect or connect the power connection of the leakage protection device 200 through a mechanical button on a handheld control device. When the user needs to control the power on and off of the leakage protection device 200, he selects the corresponding option in the application installed on the remote control device or issues the corresponding instruction through the mechanical button, and the remote control device generates a first control instruction indicating the power on and off, and sends it to the signal processing and communication module 107 of the leakage protection device 200 via wireless communication. After receiving the first control instruction, 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 turn on, thereby controlling the switch of the magnetic latching relay 106 to close or open the switch, thereby 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 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 cannot connect the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L through the remote control device, that is, the power on and off of the leakage protection device 200 cannot be remotely controlled.

[0047] Specifically, if the user wants to disconnect the power connection of the leakage protection device 200, the user sends a first control instruction to disconnect the power to the signal processing and communication module 107 through the remote control device. After receiving the first control instruction, the signal processing and communication module 107 sends a high-level pulse through pin 6 of the wireless communication chip U2, and the transistor Q3 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic latching relay 106 to disconnect, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L. If the user wants to connect the power connection of the leakage protection device 200 again, the user sends a first control instruction to connect the power to the signal processing and communication module 107 through the remote control device. After receiving the first control instruction, the signal processing and communication module 107 sends a high-level pulse through pin 12 of the wireless communication chip U2, and the transistor Q4 is turned on, so that the corresponding coil of the magnetic holding relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic holding relay 106 to close, thereby connecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L.

[0048] By setting a separate relay module 106 in the leakage protection device 200, the power on and off of the leakage protection device 200 can be controlled independently of the switch module 103, and the power connection of the leakage protection device 200 cannot be connected when the switch module 103 is disconnected, thereby avoiding connecting the power connection in potentially dangerous situations (such as when a leakage fault occurs and the switch module 103 is disconnected), ensuring that the leakage protection device 200 can be remotely controlled safely and reliably.

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

[0050] The user can also remotely obtain the power connection status of the leakage protection device 200 through the remote control device. Figure 2B As shown, one end of the photocoupler U5 is connected to the two output terminals HOT_L and WHITE_L of the leakage protection device 200, and the other end is connected to the pin 26 of the wireless communication chip U2 and the ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_L and WHITE_L, the photocoupler U5 is turned on, and the voltage at the 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, the photocoupler U5 is cut off, and the pull-up resistor in the wireless communication chip U2 pulls up the voltage at the pin 26 to a high level. By judging whether the voltage at the 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 may send a connection status indication signal to the remote control device in response to a request from the remote control device or actively (eg, when a connection status changes) at a fixed time.

[0051] The user can also remotely obtain the electrical parameters of the leakage protection device 200 through the remote control device. The electrical parameters may include but are not limited to input current, input voltage, power, power factor, electric energy, etc. When current flows through the second current-carrying line 22, the current transformer CT3 generates a corresponding current signal, which is transmitted to the operational amplifier U6 of the signal processing and communication module 107, and is amplified by the operational amplifier U6 and transmitted to the pin 5 of the wireless communication chip U2. After the analog-to-digital conversion is performed by the built-in analog-to-digital conversion circuit of the wireless communication chip U2, the current magnitude 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 the pin 27 of the signal processing and communication module 107. After the analog-to-digital conversion is performed by the built-in analog-to-digital conversion circuit of the wireless communication chip U2, the magnitude of the input voltage of 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 the electrical parameters to the remote control device in response to a request from the remote control device or actively (such as when the electrical parameters reach a certain threshold).

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

[0053] In this embodiment, when the switch button KEY1 is subjected to a first operation (such as a long press), a second control instruction indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control instruction, 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 instruction indicating power on and off is sent to the signal processing and communication module 107. Based on the third control instruction and the current state of the switch 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 turn on, thereby controlling the switch of the magnetic latching relay 106 to close or open the switch, thereby 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 a closed state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating disconnection of the power connection is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a high-level pulse, and the transistor Q3 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic latching relay 106 to be disconnected, 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 an open state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating connection of the power connection is sent to the wireless communication chip U2. Pin 12 of the wireless communication chip U2 sends a high-level pulse, and the transistor Q4 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic latching relay 106 to be closed, thereby connecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L. It can be understood that only when the switch module 103 is closed, the power connection between the input terminal HOT_I and the corresponding output terminal HOT_L can be connected by operating the switch key KEY1.

[0055] In addition, in the present embodiment, the display module 112 includes a light emitting diode LED2, which is connected to the 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 status of the power connection between the input end coupled to the switch of the magnetic latching relay 106 and the corresponding output end through different display modes of the light emitting diode LED2. For example, the light emitting diode LED2 flashes to indicate that the signal processing and communication module 107 is establishing a wireless connection with the remote control device; the light emitting diode LED2 is always on to indicate that the switch of the magnetic latching relay 106 is in a closed state, and the power connection between the input end coupled to it and the corresponding output end is connected; the light emitting diode LED2 is off to indicate that the switch of the magnetic latching relay 106 is in an open state, and the power connection between the input end coupled to it and the corresponding output end is disconnected.

[0056] Reference below Figure 3A-3B The leakage protection device 300 includes two input terminals 101 and four output terminals, which are connected by a set of current-carrying wires. The set of current-carrying wires also includes a first current-carrying wire 21, a second current-carrying wire 22, and two branches 211 and 221 branched from the first current-carrying wire 21 and the second current-carrying wire 22, so each input terminal corresponds to two output terminals. Figure 2A Different from the embodiment of the present invention, in this embodiment, the switch of the magnetic latching relay 106 is coupled in the branch line 211, that is, coupled between the input terminal HOT_I and the corresponding output terminal HOT_O. The power module 110 of the leakage protection device 300 is the same as the leakage protection device 200, so it can be referred to. Figure 2CThe power module 110 shown in FIG. 1 and its description are not repeated here.

[0057] The leakage detection function and the leakage self-checking function of the leakage protection device 300 are the same as those of the leakage protection device 200 , and are not described in detail here.

[0058] The leakage protection device 300 also has the function of remotely controlling the power on and off. This function is also realized when the switch module 103 is closed. Unlike the leakage protection device 200, since in the leakage protection device 300, the magnetic latching relay 106 is coupled in the branch line 211, it controls the power connection between the 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) on and off. For example, a remote control application can be provided. After the user installs the remote control application on his mobile phone or computer, he selects the option of disconnecting or connecting the power connection of the circuit where the branch line 211 is located in the application. For another example, the user can choose to disconnect or connect the power connection of the circuit where the branch line 211 is located through a mechanical button on a handheld control device. When the user needs to control the power on and off of the circuit where the branch line 211 is located, he selects the corresponding option in the application installed on the remote control device or issues the corresponding instruction through the mechanical button, and the remote control device generates a first control instruction indicating the power on and off, and sends it to the signal processing and communication module 107 of the leakage protection device 300 via wireless communication. After receiving the first control instruction, the signal processing and communication module 107 controls the transistor Q3 or Q4 to conduct by sending a high-level pulse through pin 6 or pin 12, thereby controlling the switch of the magnetic latching relay 106 to close or open the switch, connect or disconnect the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O, that is, connect or disconnect the power connection of the circuit where the branch line 211 is located. 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 cannot 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, it is impossible to remotely control the power on and off of the circuit where the branch line 211 is located.

[0059] Specifically, if the user wants to disconnect the power connection of the circuit where the branch line 211 in the leakage protection device 300 is located, the user sends a first control instruction to disconnect the power to the signal processing and communication module 107 through the remote control device. After receiving the first control instruction, the signal processing and communication module 107 sends a high-level pulse through the pin 6 of the wireless communication chip U2, and the transistor Q3 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and the magnetic field is generated to drive the switch of the magnetic latching relay 106 to be disconnected, thereby disconnecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O. If the user wants to connect the power connection of the circuit where the branch line 211 in the leakage protection device 300 is located again, the user sends a first control instruction to connect the power to the signal processing and communication module 107 through the remote control device. After receiving the first control instruction, the signal processing and communication module 107 sends a high-level pulse through pin 12 of the wireless communication chip U2, and the transistor Q4 is turned on, so that the corresponding coil of the magnetic holding relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic holding relay 106 to close, thereby connecting the power connection 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 protection device 300, the power on and off of the circuit where the branch line 211 in the leakage protection device 300 is located can be controlled independently of the switch module 103, and the power connection of the circuit where the branch line 211 is located cannot be connected when the switch module 103 is disconnected, thereby avoiding connecting the power connection in potentially dangerous situations (such as when a leakage fault occurs and the switch module 103 is disconnected), ensuring that the leakage protection device 300 can be remotely controlled safely and reliably.

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

[0062] The user can also remotely obtain the power connection status of the leakage protection device 300 through the remote control device. Figure 3BAs shown, one end of the photocoupler U5 is connected to the two output terminals HOT_O and WHITE_O of the leakage protection device 300, and the other end is connected to the pin 27 of the wireless communication chip U2 and the ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_O and WHITE_O, the photocoupler U5 is turned on, and the voltage at the 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, the photocoupler U5 is cut off, and the pull-up resistor in the wireless communication chip U2 pulls up the voltage at the pin 27 to a high level. By judging whether the voltage at the 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 may send a connection status indication signal to the remote control device in response to a request from the remote control device or actively (eg, when a connection status changes) at a fixed time.

[0063] The user can also remotely obtain the electrical parameters of the leakage protection device 300 through the remote control device. In this embodiment, the parameter acquisition module 109 includes an alloy resistor, which is connected in series in the 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 the pin 5 of the wireless communication chip U2, and then after the analog-to-digital conversion circuit built into the wireless communication chip U2 is converted into analog-to-digital, the current size on the branch 211 is obtained. In addition, in this embodiment, there is no need to obtain the input voltage of 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 respond to the request of the remote control device or actively (such as when the timing or the size of the electrical parameter reaches a certain threshold) to send the electrical parameters to the remote control device.

[0064] Similar to the leakage protection device 200, the leakage protection device 300 also includes a switch button KEY1 (see Figure 3B ), which is connected to the pin 16 of the wireless communication chip U2. The wireless communication chip U2 can be configured so that different functions can be realized by different operations of the switch button KEY1 by the user.

[0065] In this embodiment, when the switch button KEY1 is subjected to a first operation (such as a long press), a second control instruction indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control instruction, 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 instruction indicating power on and off is sent to the signal processing and communication module 107. Based on the third control instruction and the current state of the switch 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 turn on, thereby controlling the switch of the magnetic latching relay 106 to close or open the switch, thereby 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 a closed state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating disconnection of the power connection is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a high-level pulse, and the transistor Q3 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic latching relay 106 to be disconnected, 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 an open state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating connection of the power connection is sent to the wireless communication chip U2. Pin 12 of the wireless communication chip U2 sends a high-level pulse, and the transistor Q4 is turned on, so that the corresponding coil of the magnetic latching relay 106 is energized, and a magnetic field is generated to drive the switch of the magnetic latching relay 106 to be closed, thereby connecting the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O. It can be understood that only when the switch module 103 is closed, the power connection between the input terminal HOT_I and the corresponding output terminal HOT_O can be connected by operating the switch key KEY1.

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

[0068] Reference below Figures 4A-4B The leakage protection device 400 includes two input terminals 101 and two output terminals 102, which are connected by a set of current-carrying wires. The set of current-carrying wires includes a first current-carrying wire 21 and a second current-carrying wire 22, and each input terminal corresponds to an output terminal. Figure 3AUnlike the embodiment of the present invention, in this embodiment, the relay module 106 includes a conventional relay, whose switch is coupled in the second current-carrying line 22, that is, coupled between the input terminal WHITE_I and the corresponding output terminal WHITE_O. The relay 106 has only one coil, which is driven in a level driving mode and is connected to the collector of the transistor Q3 in the signal processing and communication module 107. The relay 106 can have a normally open contact or a normally closed contact. The power supply module 110 of the leakage protection device 400 is the same as the leakage protection device 200, so reference can be made to it. Figure 2C The power module 110 shown in FIG. 1 and its description are not repeated here.

[0069] The leakage detection function and the leakage self-checking function of the leakage protection device 400 are the same as those of the leakage protection devices 200 and 300, and are not described in detail here.

[0070] The leakage protection device 400 also has the function of remotely controlling the power on and off. This function is also realized when the switch module 103 is closed. Unlike the leakage protection device 300, since the switch of the relay 106 is coupled in the second current-carrying line 22 in the leakage protection device 400, it controls the on and off of the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. For example, a remote control application can be provided. After the user installs the remote control application on his mobile phone or computer, he selects the option of disconnecting or connecting the power connection of the leakage protection device 400 in the application. For another example, the user can choose to disconnect or connect the power connection of the leakage protection device 400 through a mechanical button on a handheld control device. When the user needs to control the power on and off of the leakage protection device 400, he selects the corresponding option in the application installed on the remote control device or issues the corresponding instruction through the mechanical button, and the remote control device generates a first control instruction indicating the power on and off, and sends it to the signal processing and communication module 107 of the leakage protection device 400 via wireless communication. After receiving the first control instruction, the signal processing and communication module 107 controls the transistor Q3 to conduct by sending a high level through the pin 6, thereby controlling the switch of the relay 106 to close or open the switch, 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 protection device 400. 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 cannot connect or disconnect the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O through the remote control device, that is, the power of the leakage protection device 400 cannot be turned on or off.

[0071] Specifically, in the case where the relay 106 has a normally open contact, if the user wants to connect the power connection of the leakage protection device 400, the user sends a first control instruction to the signal processing and communication module 107 through the remote control device to instruct to connect the power. After receiving the first control instruction, the signal processing and communication module 107 sends a high level through the pin 6 of the wireless communication chip U2, and the transistor Q3 is turned on, so that the coil of the relay 106 is energized, and a magnetic field is generated to drive the switch of the relay 106 to close, thereby connecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. If the user wants to disconnect the power connection of the leakage protection device 400 again, the user sends a first control instruction to the signal processing and communication module 107 through the remote control device to instruct to disconnect the power. After receiving the first control instruction, the signal processing and communication module 107 sends a low level through pin 6 of the wireless communication chip U2, and the transistor Q3 is turned off, so that the coil of the relay 106 loses power and the switch of the relay 106 is disconnected, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O.

[0072] In the case where the relay 106 has a normally closed contact, if the user wants to disconnect the power connection of the leakage protection device 400, it sends a first control instruction to the signal processing and communication module 107 through the remote control device to disconnect the power. After receiving the first control instruction, the signal processing and communication module 107 sends a high level through the pin 6 of the wireless communication chip U2, and the transistor Q3 is turned on, so that the coil of the relay 106 is energized, and a magnetic field is generated to drive the switch of the relay 106 to be disconnected, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. If the user wants to connect the power connection of the leakage protection device 400 again, it sends a first control instruction to the signal processing and communication module 107 through the remote control device to connect the power. After receiving the first control instruction, the signal processing and communication module 107 sends a low level through the pin 6 of the wireless communication chip U2, and the transistor Q3 is turned off, so that the coil of the relay 106 is de-energized, and the switch of the relay 106 is closed, thereby connecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O.

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

[0074] The user can also remotely obtain the power connection status of the leakage protection device 400 through the remote control device. Figure 4B As shown, one end of the photocoupler U5 is connected to the two output terminals HOT_O and WHITE_O of the leakage protection device 400, and the other end is connected to the pin 27 of the wireless communication chip U2 and the ground. When the input terminals HOT_I and WHITE_I are connected to the output terminals HOT_O and WHITE_O, the photocoupler U5 is turned on, and the voltage at the 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, the photocoupler U5 is cut off, and the pull-up resistor in the wireless communication chip U2 pulls up the voltage at the pin 27 to a high level. By judging whether the voltage at the 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 may send a connection status indication signal to the remote control device in response to a request from the remote control device or actively (eg, when a connection status changes) at a fixed time.

[0075] The user can also remotely obtain the electrical parameters of the leakage protection device 400 through the remote control device. In this embodiment, the parameter acquisition module 109 includes an alloy resistor, which is 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 the pin 5 of the wireless communication chip U2, and then converted by the analog-to-digital conversion circuit built into the wireless communication chip U2 to obtain the current size on the second current-carrying line 22. In addition, in this embodiment, it is not necessary to obtain the input voltage of the input end, 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 the electrical parameters to the remote control device in response to the request of the remote control device or actively (such as when the timing or the size of the electrical parameters reaches a certain threshold).

[0076] Similar to the leakage protection devices 200 and 300, the leakage protection device 400 also includes a switch button KEY1 (see Figure 4B ), which is connected to the pin 16 of the wireless communication chip U2. The wireless communication chip U2 can be configured so that different functions can be realized by different operations of the switch button KEY1 by the user.

[0077] In this embodiment, when the switch button KEY1 is subjected to the first operation (such as long press), a second control instruction indicating a wireless connection (such as a WiFi connection) is sent to the wireless communication chip U2. After receiving the second control instruction, the wireless communication chip U2 establishes a wireless connection with the remote control device. When the switch button KEY1 is subjected to the second operation (such as short press), a third control instruction indicating power on and off is sent to the signal processing and communication module 107. Based on the third control instruction and the current state of the switch of the relay 106, the signal processing and communication module 107 controls the transistor Q3 to turn on by sending a high level through pin 6, thereby controlling the switch of the relay 106 to close or open the switch, 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 protection device 400.

[0078] In the case where the relay 106 has a normally open contact, when the switch of the relay 106 is currently in an open state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating that the power connection is connected is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a high level, and the transistor Q3 is turned on, so that the coil of the relay 106 is energized, and a magnetic field is generated to drive the switch of the relay 106 to close, thereby connecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. When the switch of the relay 106 is currently in a closed state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating that the power connection is disconnected is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a low level, and the transistor Q3 is turned off, so that the coil of the relay 106 loses power, and the switch of the relay 106 is disconnected, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. It can be understood that only when the switch module 103 is closed, the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O can be connected by operating the switch key KEY1.

[0079] In the case where the relay 106 has a normally closed contact, when the switch of the relay 106 is currently in a closed state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating disconnection of the power connection is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a high level, and the transistor Q3 is turned on, so that the coil of the relay 106 is energized, and a magnetic field is generated to drive the switch of the relay 106 to disconnect, thereby disconnecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. When the switch of the relay 106 is currently in an open state, a second operation is performed on the switch button KEY1 so that a third control instruction indicating connection of the power connection is sent to the wireless communication chip U2. Pin 6 of the wireless communication chip U2 sends a low level, and the transistor Q3 is turned off, so that the coil of the relay 106 loses power, and the switch of the relay 106 is closed, thereby connecting the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O. It can be understood that only when the switch module 103 is closed, the power connection between the input terminal WHITE_I and the corresponding output terminal WHITE_O can be connected by operating the switch key KEY1.

[0080] In addition, the leakage protection device 400 also includes a display module 112 . The function of the display module 112 is the same as that of the display module 112 in the leakage protection devices 200 and 300 , and will not be described in detail herein.

[0081] The present invention further proposes an electrical connection device, comprising: a housing; and a leakage protection device according to any one of the above embodiments, wherein the leakage protection device is accommodated in the housing.

[0082] In addition, the present invention also proposes an electrical appliance, including: a load device; and an electrical connection device, which is coupled to the load device and is used to supply power to the load device, and the electrical connection device includes any one of the leakage protection devices in the above embodiments.

[0083] Therefore, although the present invention is described with reference to specific examples, wherein these specific examples are intended to be illustrative only and not limiting of the present invention, it is obvious to those skilled in the art that the disclosed embodiments may be changed, added or deleted without departing from the spirit and scope of the present invention.

Claims

1. A leakage protection device, comprising: A plurality of input terminals and a plurality of output terminals are connected through a set of current-carrying lines, and each input terminal corresponds 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 power connection between the plurality of input terminals and the plurality of output terminals; a leakage detection module, configured to detect leakage current signals on the set of current-carrying wires, and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal 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; as well as A signal processing and communication module is coupled to the relay module and is configured to wirelessly communicate with a remote control device and receive a first control instruction indicating power on or off 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 leakage protection device according to claim 1, further comprising: a state detection module, which is coupled to at least one of the plurality of output terminals and the signal processing and communication module, and is configured to detect the on / off state of the power connection between the output terminal coupled thereto and the corresponding input terminal, and to generate a connection state 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 the signal to the remote control device.

3. The leakage protection device according to claim 2, wherein: The state detection module includes a photoelectric coupler and / or a relay.

4. The leakage protection device according to claim 1 or 2, further comprising: a parameter acquisition module, which is coupled between at least one input terminal and at least one corresponding output terminal and coupled to the signal processing and communication module, and is 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 leakage protection device according to claim 4, wherein: The parameter acquisition module includes: a current sensor configured to collect a 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 also includes: an operational amplifier coupled to the current sensor and configured to amplify the current sampling signal; and The analog-to-digital conversion circuit is coupled to the operational amplifier and is configured to perform analog-to-digital conversion on the amplified current sampling signal to serve as the electrical parameter.

6. The leakage protection device according to claim 5, wherein: The current sensor includes an alloy resistor and / or a current transformer.

7. The leakage protection device according to claim 4, wherein: The parameter acquisition module includes: a rectifying unit configured to rectify an input voltage of the at least one input terminal, and The signal processing and communication module also includes: a voltage dividing unit, coupled to the rectifying unit and configured to divide the rectified input voltage; and The analog-to-digital conversion circuit is coupled to the voltage dividing unit and is configured to perform analog-to-digital conversion on the divided input voltage to serve as the electrical parameter.

8. The leakage protection device according to claim 1, further comprising: a switch button, which is coupled to the signal processing and communication module and is configured to send a second control instruction indicating a wireless connection to the signal processing and communication module when a 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 instruction.

9. The leakage protection device according to claim 8, wherein: The switch button is further configured to send a third control instruction indicating power on and off to the signal processing and communication module when the second operation is performed, and, The signal processing and communication module is also configured to: based on the third control instruction, control the relay module to open or close the switch, and then disconnect or connect 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 leakage protection device according to claim 1 or 2, further comprising: The display module is coupled to the signal processing and communication module and is 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.

11. The leakage protection device according to claim 1, wherein: The relay module includes a magnetic latching relay.

12. The leakage protection device according to claim 11, wherein: The magnetic latching relay has two sets of coils.

13. The leakage protection device according to claim 1, further comprising: A power supply module is coupled to the leakage detection module, the relay module and the signal processing and communication module, and is configured to supply power to the leakage detection module, the relay module and the signal processing and communication module.

14. The leakage protection device according to claim 1, further comprising: a leakage self-check module, which is coupled to the leakage detection module and the driving module and is configured to periodically generate the simulated leakage current signal to detect whether the leakage detection module fails and to generate a self-check fault signal when the leakage detection module fails, and, The driving module is further configured to receive the self-test 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 self-test fault signal.

15. An electrical connection device, comprising: case; as well as The leakage protection device according to any one of claims 1 to 14, wherein the leakage protection device is accommodated in the housing.

16. An electrical appliance, comprising: Load equipment; as well as The electrical connection device according to claim 15, coupled to the load device, for supplying power to the load device.

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