Electrical device

Abstract

The utility model discloses an electrical device. The electrical equipment is arranged in a PME system, and comprises a PEN controllable switch assembly connected to a PEN line; the first leakage current detection module is connected to the PEN line in series and used for detecting first leakage current on the PEN line when the PEN controllable switch assembly is closed and outputting a first leakage current detection signal; the signal processing module is connected with the output end of the first leakage current detection module and is used for processing the first leakage current detection signal; the control module is connected with the output end of the signal processing module and used for receiving the processed first leakage current detection signal and generating a switch control signal based on the first leakage current detection signal; and the switch control module is connected with the output end of the control module and the control end of the PEN controllable switch assembly, and is used for controlling the PEN controllable switch assembly to be switched on or switched off based on the switch control signal. The electrical equipment has relatively high safety and reliability.

Description

Technical Field

[0001] This application relates to the field of charging control technology, and in particular to an electrical device. Background Technology

[0002] In charging systems, PME (Placement Earth Mesh) refers to a specific type of grounding system where the neutral (N) and protective earth (PE) conductors are connected together to form the PEN conductor, meaning the PEN conductor is shared by both the PE and N conductors. When connecting electrical equipment, the N and PEN conductors need to be connected to each piece of equipment separately, and then the PEN conductor is connected to the ground to provide grounding protection for all the equipment.

[0003] To prevent electric shock accidents in the PME system under abnormal grid conditions, a PEN switch assembly is usually installed on the PEN line of the PME system to monitor whether the voltage vector sum of the phase line exceeds the threshold. Once an excessively high voltage is detected, the PEN switch assembly will be controlled to disconnect to interrupt the charging process, thereby preventing possible electric shock hazards and equipment damage.

[0004] However, in a PME system, the direct connection of the PE line to the N line presents certain safety hazards. For example, if the remote N line (i.e., the PEN line) breaks, both the N and PE lines will be in a floating state. If the three-phase power grid is in a locally balanced state at this time, the charging station can operate normally. However, if a user comes into contact with the PE line, it will result in an electric shock. For such faults, the voltage detection module cannot detect excessive voltage and will not trigger the protection function of the PEN switch assembly, thus causing irreversible damage. Utility Model Content

[0005] In view of this, the present application provides an electrical device, the main purpose of which is to solve the technical problem of poor safety and reliability of electrical devices in PME systems.

[0006] According to one aspect of this application, an electrical device is provided, the electrical device being disposed in a PME system, the electrical device comprising:

[0007] The PEN controllable switch assembly is connected to the PEN line and is used to disconnect or connect the PEN line.

[0008] The first leakage current detection module is connected in series with the PEN controllable switch assembly on the PEN line, and is used to detect the first leakage current on the PEN line when the PEN controllable switch assembly is closed, and output the first leakage current detection signal.

[0009] A signal processing module is connected to the output terminal of the first leakage current detection module and is used to process the first leakage current detection signal.

[0010] The control module is connected to the output of the signal processing module and is used to receive the processed first leakage current detection signal and generate a switch control signal based on the first leakage current detection signal.

[0011] A switch control module is connected to the output terminal of the control module and the control terminal of the PEN controllable switch assembly, and is used to control the PEN controllable switch assembly to close or open based on the switch control signal.

[0012] In one embodiment, the first leakage current detection module includes a current transformer and a reference voltage source, wherein the first input terminal of the current transformer is connected to the first end of the PEN line, the second input terminal of the current transformer is connected to the second end of the PEN line, the first output terminal of the current transformer is connected to the reference voltage source, and the second output terminal of the current transformer serves as the output terminal of the first leakage current detection module and is connected to the input terminal of the signal processing module.

[0013] In one embodiment, the first leakage current detection module further includes a first filtering unit, wherein the first filtering unit is connected between the first output terminal and the ground terminal of the current transformer.

[0014] In one embodiment, the signal processing module includes an operational amplifier and several resistors, wherein the negative input terminal of the operational amplifier is connected to the output terminal of the first leakage current detection module, the positive input terminal of the operational amplifier is connected to the reference voltage source, the output terminal of the operational amplifier is connected to the negative input terminal of the operational amplifier through a feedback resistor, and the output terminal of the operational amplifier is also connected to the input terminal of the control module through a filter resistor.

[0015] In one embodiment, the signal processing module further includes a matching resistor, wherein the matching resistor is connected in series between the output terminal of the first leakage current detection module and the negative input terminal of the operational amplifier, and the resistance value of the matching resistor is greater than the internal resistance of the current transformer.

[0016] In one embodiment, the signal processing module further includes a first protection unit and / or a second filtering unit, wherein the first protection unit is disposed between the positive input terminal and the negative input terminal of the operational amplifier, and / or, the first protection unit is disposed between the output terminal and the power supply terminal of the operational amplifier, and / or, the first protection unit is disposed between the output terminal and the ground terminal of the operational amplifier; and / or, the second filtering unit is disposed between the negative input terminal and the output terminal of the operational amplifier, and / or, the second filtering unit is disposed between the output terminal and the ground terminal of the operational amplifier.

[0017] In one embodiment, the switch control module includes a switch device or several resistors, wherein the control terminal of the switch device is connected to the output terminal of the control module through a current-limiting resistor, the control terminal of the switch device is also connected to the power supply terminal through a pull-up resistor, and the control terminal of the switch device is also grounded through a pull-down resistor; the first terminal of the switch device is connected to the control terminal of the PEN controllable switch assembly, the first terminal of the switch device is also connected to the power supply terminal, and the second terminal of the switch device is grounded.

[0018] In one embodiment, the switch control module further includes a second protection unit and / or a third filtering unit, wherein the second protection unit is disposed between the control terminal and the power supply terminal of the PEN controllable switch assembly; and / or, the third filtering unit is disposed between the control terminal and the ground terminal of the switch device.

[0019] In one embodiment, the electrical equipment further includes a voltage detection module connected to the control module, the voltage detection module being used to detect the voltage at the grid-side input terminal and output a voltage detection signal; and the electrical equipment is connected to a second leakage current detection module, the second leakage current detection module being used to detect a second leakage current at the grid-side input terminal and output a second leakage current detection signal, the control module being used to receive the second leakage current detection signal; the control module generates a PME alarm signal when it detects that the first leakage current detection signal is greater than or equal to a preset first current threshold and the second leakage current detection module does not detect the second leakage current detection signal; and / or, the control module generates a PME alarm signal when it detects that the first leakage current detection signal is greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and the voltage detection signal is greater than a preset first voltage threshold and the second leakage current detection module does not detect the second leakage current detection signal; and / or, the control module generates a PME alarm signal when it detects that the duration for which the voltage detection signal is greater than the preset second voltage threshold exceeds the response time corresponding to the second voltage threshold.

[0020] In one embodiment, the control module is also communicatively connected to the information indication module of the electrical equipment, wherein the control module is further configured to output the PME alarm signal to the information indication module so that the information indication module indicates the PME alarm signal.

[0021] In one embodiment, the electrical equipment further includes a voltage detection module connected to the control module, the voltage detection module being used to detect the voltage at the grid-side input terminal and output a voltage detection signal; and the electrical equipment is connected to a second leakage current detection module, the second leakage current detection module being used to detect a second leakage current at the grid-side input terminal and output a second leakage current detection signal, the control module being used to receive the second leakage current detection signal; when the control module detects that the first leakage current detection signal is greater than or equal to a preset first current threshold and the second leakage current detection module does not detect the second leakage current detection signal, it outputs a switch control signal to control the PEN controllable switch assembly to disconnect; and / or, when the control module detects that the first leakage current detection signal is greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and the voltage detection signal is greater than a preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, it outputs a switch control signal to control the PEN controllable switch assembly to disconnect.

[0022] In one embodiment, the control module is also connected to the control terminal of the power switch of the electrical equipment. After outputting a switch control signal to control the PEN controllable switch assembly to disconnect, the control module is also used to output a power switch control signal to control the power switch to disconnect, thereby pausing charging.

[0023] In one embodiment, the voltage detection signal is detected by means of: in a three-phase system, detecting the phase voltages of the three phase lines respectively and calculating their vector sum to obtain the voltage detection signal; in a single-phase system, detecting the voltage between the phase line and the neutral line as the voltage detection signal.

[0024] By employing the above technical solution, this application provides an electrical device, which includes a PEN controllable switch assembly installed on the PEN line and a first leakage current detection module. The first leakage current detection module can detect leakage current on the PEN line and output a first leakage current detection signal. This signal, after processing by a signal processing module, can be input to a control module. The control module can determine whether there is excessive leakage current on the PEN line based on the first leakage current detection signal and output a switch control signal to control the PEN controllable switch assembly on the PEN line to close or open, thereby achieving electrical protection. This electrical device can protect electrical equipment in the PME system in the event of a leakage fault by detecting leakage current on the PEN line and controlling the switching of the PEN controllable switch assembly. Especially in the event of a fault such as a break in the remote N line, the residual current device installed at the grid-side input cannot detect the residual current, thus posing a significant safety hazard. In contrast, the aforementioned electrical equipment can detect excessive leakage current on the PEN line through the first leakage current detection module, thereby timely disconnecting the PEN controllable switch assembly, making the PE line of the electrical equipment unenergized, thus protecting users from the risk of electric shock and improving the safety and reliability of the electrical equipment.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This paper shows a schematic diagram of the system architecture of a PME system provided in an embodiment of this application;

[0028] Figure 2 This paper shows a schematic diagram of the structure of an electrical device provided in an embodiment of this application;

[0029] Figure 3 A circuit diagram of a first leakage current detection module provided in an embodiment of this application is shown;

[0030] Figure 4 A circuit diagram of a signal processing module provided in an embodiment of this application is shown;

[0031] Figure 5A circuit diagram of a switch control module provided in an embodiment of this application is shown. Detailed Implementation

[0032] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0033] A PME (Protective Multiple Earthing) system refers to a specific type of grounding system. (See reference...) Figure 1 In a PME system, the neutral (N) conductor and the protective earth (PE) conductor are connected together before entering the building, forming the PEN conductor (a shared conductor for both protective earthing and neutral). When connecting electrical equipment, the N conductor and the PEN conductor need to be connected to each piece of equipment separately. Then, the PEN conductor is connected to the earth to provide unified grounding protection for all electrical equipment entering the building.

[0034] Conversely, non-PME systems refer to systems that do not employ a PME configuration. These mainly include TN-S systems, IT systems, and TT systems, among others. In a TN-S system, the neutral point on the power supply side is directly grounded, and the N and PE lines are completely separated in subsequent systems. In an IT system, the neutral line may not be grounded or may be grounded through a high-impedance conductor. In a TT system, the neutral point on the power supply side is directly grounded, while the exposed conductive parts of the electrical equipment are grounded separately through the PE line.

[0035] Therefore, the main difference between PME and non-PME systems is that in a PME system, the PE line is separated from the PEN line, while in a non-PME system, the PE and N lines are only grounded at the neutral point on the power supply side, while the N and PE lines on the equipment side remain insulated. This difference affects the connection method of the equipment. Based on this connection method, in a PME system, a connection failure in the PEN line can create a safety hazard. In this case, the equipment casing and the PE line may become live, potentially leading to electric shock. In a non-PME system, such as a TN-S system, both the power system end of the PE line and the equipment casing are stably grounded, preventing the equipment casing and PE line from becoming live and posing a safety risk due to a break in the N line.

[0036] by Figure 1Taking the scenario shown as an example, in a PME system, when the remote N line breaks, the phase line (L line) in the power grid will form a connection loop with the N line through the electrical equipment, causing the PEN line to become energized. If a user comes into contact with the PE line, it will lead to an electric shock accident. In existing technology, faults in PME systems are mainly detected by the voltage U1 between the L and N lines. Once the detected change in voltage U1 exceeds a threshold, the PEN switch assembly will be controlled to open, thereby triggering the protection function.

[0037] However, the existing judgment methods still have some loopholes. These mainly include the following: First, when the charging system is unbalanced, the voltage U1 will deviate, easily leading to false alarms—that is, issuing a PME fault alarm or disconnecting the PEN switch assembly when no PME fault has occurred. Second, after a PME fault occurs, if the N line is floating (i.e., the N line is broken at a remote end), a voltage will be generated on the N line. However, if the power grid tends to be balanced at this time, the voltage difference between the N line and ground may be relatively small. In this case, the fault state cannot be detected by the voltage U1. However, touching the N line at this time will generate current, and if an electric shock occurs, it will not be enough to pull the power grid out of balance, thus posing a continued risk of electric shock. Finally, the RCD (Residual Current Device) cannot detect the floating voltage caused by a break in the N line at a remote end of the PME system. The RCD's detection principle is to detect the difference in current flowing in opposite directions through the L and N lines to detect residual current. This current is usually generated by equipment leakage. Furthermore, the RCD can only detect leakage current occurring after its current stage, not before it. If the neutral (N) line breaks at a distant point, it means the break occurs before the RCD. Therefore, there will be no significant residual current flowing through the RCD, preventing it from detecting the abnormality and triggering the protection function of the PEN switch assembly. Consequently, it cannot prevent potential electric shock accidents.

[0038] To address the safety hazards present in PME systems and improve the safety and reliability of electrical equipment within these systems, this embodiment provides an electrical device that can be applied to the aforementioned PME system. For example... Figure 2As shown, the aforementioned electrical equipment includes a PEN controllable switch assembly 10, a first leakage current detection module 20, a signal processing module 30, a control module 40, and a switch control module 50. The PEN controllable switch assembly 10 is connected to the PEN line to open or close the PEN line. The first leakage current detection module 20 is connected in series with the PEN controllable switch assembly 10 on the PEN line to detect a first leakage current on the PEN line when the PEN controllable switch assembly is closed, and outputs a first leakage current detection signal. The signal processing module 30 is connected to the output of the first leakage current detection module 20 to process the first leakage current detection signal. The control module 40 is connected to the output of the signal processing module 30 to receive the processed first leakage current detection signal and generate a switch control signal based on the first leakage current detection signal. The switch control module 50 is connected to the output of the control module 40 and the control terminal of the PEN controllable switch assembly 10 to control the PEN controllable switch assembly 10 to close or open based on the switch control signal.

[0039] Specifically, when the electrical equipment starts charging, the PEN controllable switch assembly 10 can be closed to conduct the PEN line and provide grounding protection. At this time, the first leakage current on the PEN line can be detected by the first leakage current detection module 20, and the detected first leakage current detection signal is output to the signal processing module 30. The signal processing module 30 can perform various processing on the first leakage current detection signal, such as filtering, amplification, and signal range adjustment, and output the processed first leakage current detection signal to the control module 40. The processed first leakage current detection signal is sufficiently stable and has an appropriate signal range, and can be input to the control module 40 for leakage current monitoring and judgment. Furthermore, when the control module 40 detects excessive leakage current on the PEN line through the processed first leakage current detection signal, it can be considered that there is a risk of leakage in the electrical equipment. At this time, the control module 40 can output a switch control signal to control the PEN controllable switch assembly 10 to open, thereby preventing users from being electrocuted by contact with the electrical equipment.

[0040] In this embodiment, the composition and arrangement of the PEN controllable switch assembly 10 are not limited. In an optional embodiment, the PEN controllable switch assembly 10 can be a PEN relay, wherein the normally open switch of the PEN relay can be connected in series with the PEN line to open or close the PEN line; one end of the coil of the PEN relay is connected to the power supply terminal, and the other end is connected to the output terminal of the switch control module 50, for controlling the normally open switch of the PEN relay to close or open based on the switch control signal output by the switch control module 50, thereby preventing possible electric shock accidents. In other optional embodiments, the PEN controllable switch assembly 10 can also be a contactor or other types of switch assembly, which is not limited in this embodiment.

[0041] It should be noted that the specific method by which the control module 40 judges leakage risk based on the processed first leakage current detection signal can be set according to the actual situation. For example, the control module 40 can compare the first leakage current detection signal with a preset current threshold and the detection result of the RCD to determine whether the electrical equipment has a leakage fault. Alternatively, the control module 40 can also combine the deviation range of the input voltage and the detection result of the RCD for auxiliary judgment to determine whether the electrical equipment has a leakage fault. In addition, the control module 40 can also issue a PME alarm signal to remind the user to stay away from the electric shock area. This embodiment does not impose specific limitations on the judgment logic, PME alarm method, and PME protection method inside the control module 40, and these judgment logics can all be implemented by program modules in the prior art.

[0042] Furthermore, the circuit connection methods and component selections within each circuit module of the aforementioned electrical equipment can be determined based on actual conditions, and this embodiment does not impose specific limitations. The electric shock protection function achievable by the electrical equipment provided in this embodiment is mainly realized through the circuit connection relationships between each circuit module, and does not depend on a program module within a particular circuit module. For circuit modules that can have program modules embedded, their module functions can be implemented using program modules provided by existing technologies.

[0043] The electrical equipment provided in the above embodiments includes a PEN controllable switch assembly and a first leakage current detection module installed on the PEN line. The first leakage current detection module detects leakage current on the PEN line and outputs a first leakage current detection signal. This signal, after processing by a signal processing module, is input to a control module. The control module can determine whether excessive leakage current exists on the PEN line based on the first leakage current detection signal and outputs a switch control signal to control the PEN controllable switch assembly on the PEN line to close or open, thereby achieving electrical protection. This electrical equipment can protect electrical equipment in the PME system in the event of a leakage fault by detecting leakage current on the PEN line and controlling the switching of the PEN controllable switch assembly. Especially in the event of a fault such as a break in the remote N line, the residual current device installed at the grid-side input cannot detect the residual current, thus posing a significant safety hazard. In contrast, the aforementioned electrical equipment can detect excessive leakage current on the PEN line through the first leakage current detection module, thereby timely disconnecting the PEN controllable switch assembly, making the PE line of the electrical equipment unenergized, thus protecting users from the risk of electric shock and improving the safety and reliability of the electrical equipment.

[0044] In one embodiment, Figure 3As shown, the first leakage current detection module includes a current transformer CT1 and a reference voltage source Vref. The first input terminal 4 of the current transformer CT1 is connected to the first terminal PME_IN of the PEN line, the second input terminal 3 of the current transformer is connected to the second terminal PME_OUT of the PEN line, the first output terminal 1 of the current transformer CT1 is connected to the reference voltage source Vref, and the second output terminal 2 of the current transformer CT1 serves as the output terminal of the first leakage current detection module and is connected to the input terminal of the signal processing module, used to output the first leakage current detection signal PE_CURR to the signal processing module.

[0045] Specifically, the first leakage current detection module can detect leakage current on the PEN line by integrating a current transformer CT1 and a reference voltage source Vref. In this embodiment, the current transformer CT1 can be used to detect the current between the first terminal PME_IN and the second terminal PME_OUT of the PEN line. The first input terminal 4 and the second input terminal 3 of CT1 are respectively connected to the two ends of the PEN line to capture the current signal flowing through the PEN line. The first output terminal 1 of CT1 is connected to the reference voltage source Vref, providing a stable reference voltage for current detection. The second output terminal 2 of CT1 serves as the output terminal of the detection module and is connected to the input terminal of the signal processing module, enabling the real-time transmission of the first leakage current detection signal PE_CURR to the signal processing module.

[0046] The above embodiment, by incorporating a current transformer and a reference voltage source in the first leakage current detection module, enables rapid and accurate detection of leakage current on the PEN line. Once an abnormal leakage current is detected, indicating a potential leakage, the output first leakage current detection signal will trigger subsequent signal processing and control mechanisms, thereby promptly cutting off the faulty circuit or taking other protective measures to prevent electric shock accidents and electrical fires, and improve the safety and reliability of electrical equipment.

[0047] In one embodiment, the first leakage current detection module further includes a first filtering unit, wherein the first filtering unit is connected between the first output terminal of the current transformer and the ground terminal. In this embodiment, the first filtering unit may include various filtering devices such as resistors and capacitors. For example, such as... Figure 3 As shown, the first filtering unit may include a decoupling capacitor C269, which can be connected between the first output terminal 1 of the current transformer CT1 and the ground terminal. It is understood that the configuration of the first filtering unit can be customized according to actual needs, and this embodiment does not impose specific limitations.

[0048] Specifically, a first filtering unit can also be set in the first leakage current detection module to improve the stability and accuracy of the first leakage current detection signal. In this embodiment, the first filtering unit can be set between the first output terminal 1 of the current transformer CT1 and the ground terminal. For example, the first filtering unit can be composed of a decoupling capacitor C269 and used to filter out high-frequency noise and interference signals in the signal, thereby ensuring that the first leakage current signal output from CT1 remains pure during transmission, thereby improving the recognition and processing efficiency of the first leakage current detection signal by the signal processing module. In addition, the specific implementation of the first filtering unit can be adjusted according to the actual application scenario and requirements, and this embodiment does not impose specific limitations here.

[0049] The above embodiments improve the detection accuracy and signal stability of the first leakage current detection signal by setting a first filtering unit in the first leakage current detection module, thereby enhancing the accuracy of leakage current detection.

[0050] In one embodiment, Figure 4 As shown, the signal processing module includes an operational amplifier U10B and several resistors. The negative input terminal 6 of the operational amplifier U10B is connected to the output terminal of the first leakage current detection module and is used to receive the first leakage current detection signal output by the first leakage current detection module.

[0051] PE_CURR, the positive input terminal 5 of operational amplifier U10B is connected to the reference voltage source VCC_1.65V and is used to receive the reference voltage. The output terminal 7 of operational amplifier U10B is connected to the negative input terminal 6 of operational amplifier U10B through feedback resistor R38. The output terminal 7 of operational amplifier U10B is also connected to the input terminal of the control module through filter resistor R40 and is used to output the processed first leakage current detection signal PE_CURR_AD(MCU) to the control module.

[0052] Specifically, such as Figure 4As shown, the negative input terminal 6 of operational amplifier U10B is connected to the output terminal of the first leakage current detection module, which can be used to receive the first leakage current detection signal. The positive input terminal 5 of U10B is connected to the reference voltage source VCC_1.65V, which can provide a reliable voltage reference for signal amplification and process the first leakage current detection signal to a voltage range suitable for the control module to receive, such as 0-3.3V. During the amplification process, the negative feedback loop formed by the feedback resistor R38 can stabilize the output, set the gain, and suppress the nonlinear distortion of the amplifier. In addition, by adding a filter resistor R40 in the signal processing module, high-frequency noise and interference in the signal can be filtered out, thereby improving the purity of the signal. Finally, the processed first leakage current detection signal PE_CURR_AD (MCU) can be output to the control module through the output terminal 7 of U10B, so that the control module can monitor the leakage current on the PEN line in real time.

[0053] The above-described technical embodiments integrate operational amplifiers and resistor networks in the signal processing module, which can amplify and adjust the signal input range of the first leakage current detection signal, thereby ensuring the accuracy and stability of the first leakage current detection signal and ensuring the safe operation of electrical equipment.

[0054] In one embodiment, Figure 4 As shown, the signal processing module also includes a matching resistor R39. The matching resistor R39 is connected in series between the output terminal of the first leakage current detection module and the negative input terminal 6 of the operational amplifier U10B. In this embodiment, the resistance value of the matching resistor R39 is greater than the internal resistance of the current transformer. By setting the matching resistor R39 in the signal processing module, the error in signal acquisition can be reduced.

[0055] Specifically, the matching resistor R39 can be connected in series between the output terminal of the first leakage current detection module and the negative input terminal 6 of the operational amplifier U10B. Its resistance value is set to be much larger than the internal resistance of the current transformer CT1, for example, 10-15 times the internal resistance of the current transformer. This effectively increases the internal resistance of the current transformer CT1, making the change in winding resistance relatively small compared to the overall internal resistance. Therefore, it can effectively improve the consistency of the internal resistance value of the current transformer CT1. R39 reduces the signal delay inconsistency caused by the inconsistent internal resistance of the current transformer, ensuring the consistency of the time for the leakage current detection signal to establish a steady state. Therefore, the matching resistor R39 can play a role in impedance matching, thereby reducing the signal delay inconsistency during transmission and improving the overall performance of the signal processing module.

[0056] In one embodiment, Figure 4As shown, the signal processing module further includes a first protection unit and / or a second filtering unit. The first protection unit can be located in at least one of the following positions: between the positive input terminal 5 and the negative input terminal 6 of operational amplifier U10B, for example, D6 and D7; between the output terminal 7 of operational amplifier U10B and the power supply terminal MCU_VCC, for example, D4; or between the output terminal 7 of operational amplifier U10B and the ground terminal, for example, D5. The second filtering unit can be located in at least one of the following positions: between the negative input terminal 6 and the output terminal 7 of operational amplifier U10B, for example, C57; or between the output terminal 7 of operational amplifier U10B and the ground terminal, for example, C58.

[0057] Specifically, the first protection unit can be set at some key locations in the signal processing module. For example, diodes D6 and D7 can be placed at the input terminals of operational amplifier U10B to protect the positive and negative inputs of operational amplifier U10B. Diode D4 can be placed between the output terminal of operational amplifier U10B and the power supply terminal MCU_VCC to prevent overvoltage. Diode D5 can be placed between the output terminal of operational amplifier U10B and the ground terminal to protect the output from short circuits. In this embodiment, by setting the first protection unit in the signal processing module, damage to the circuit caused by abnormal voltage or short circuits can be effectively prevented. Furthermore, the second filtering unit can be set at an appropriate location in the signal path of the signal processing module. For example, filter capacitor C57 can be placed between the negative input terminal 6 and the output terminal 7 of operational amplifier U10B to filter out high-frequency noise. Filter capacitor C58 can be placed between the output terminal 7 and the ground terminal of operational amplifier U10B to filter out high-frequency noise in the processed first leakage current detection signal, so as to ensure the purity and stability of the output signal.

[0058] The above embodiments, by setting a first protection unit and a second filtering unit in the signal processing module, can improve the protection capability and signal quality of the circuit, thereby enhancing the reliability and safety of electrical equipment and providing a strong guarantee for the stable operation of electrical equipment.

[0059] In one embodiment, Figure 5As shown, the switch control module includes a switching device Q12 or several resistors. The control terminal of the switching device Q12 is connected to the output terminal of the control module through a current-limiting resistor R120, and is used to receive the switch control signal RLY6_CTRL output by the control module. The control terminal of the switching device Q12 is also connected to the power supply terminal VCC through a pull-up resistor R118, and is also grounded through a pull-down resistor R123. The pull-up resistor R118 and the pull-down resistor R123 can form a voltage divider circuit to reduce the control voltage of the switching device Q12. Q12 can be a voltage-controlled switch. The first terminal of the switching device Q12 is connected to the control terminal of the PEN controllable switch assembly, and is used to control the PEN controllable switch assembly to open or close via the signal RLY6_CTR. The first terminal of the switching device Q12 is also connected to the power supply terminal...

[0060] The RLY_PWR connection connects to ground the second terminal of the switching device Q12.

[0061] Specifically, such as Figure 5 As shown, the control terminal of switching device Q12 is connected to the control module through a current-limiting resistor R120 to receive the switch control signal RLY6_CTRL. The current-limiting resistor R120 prevents transient currents in the circuit from impacting the switching device, which could cause damage or instability, thus ensuring the safe transmission of the switch control signal. Simultaneously, the control terminal of switching device Q12 is also connected to the power supply terminal VCC through a pull-up resistor R118 and grounded through a pull-down resistor R123. These two resistors together form a voltage divider circuit, which can adjust the control voltage of switching device Q12, enhancing the stability and adaptability of the circuit. Furthermore, the pull-down resistor R123 can keep the switching device in the off state when charging is stopped, thus protecting Q12 from external interference or noise and preventing it from being in an uncertain switching state.

[0062] In this embodiment, the working principle of the switch control module is as follows: The control module responds to the charging command by issuing a switch control signal, setting the switch control signal RLY6_CTRL to an active state (i.e., a high-level state). At this time, switch Q12 is turned on, the first and second terminals of switch Q12 are connected, and signal RLY6_CTRL is pulled low. A voltage difference is formed across the coil of the PEN controllable switch assembly, and the PEN controllable switch assembly closes. When a fault such as leakage or grounding occurs, the control module issues a switch control signal, setting the switch control signal RLY6_CTRL to an inactive state (i.e., a low-level state). At this time, switch Q12 is turned off, and the first terminal of switch Q12 is connected to the power supply RLY_PWR.

[0063] When RLY6_CTR goes high, there is no voltage difference across the coil of the PEN controllable switch assembly, and the PEN controllable switch assembly is open. Furthermore, in the uncharged state, by grounding the control terminal of switch Q12 through a resistor, switch Q12 can be kept in the off state, thus keeping the PEN controllable switch assembly continuously open. In this case, even if the neutral line of the power grid is broken, the electrical equipment can be protected by the disconnected PEN line, protecting the downstream systems. During charging, the power supply VCC signal can reach the control terminal of switch Q12 before the switch control signal, allowing switch Q12 to conduct first, thus controlling the PEN controllable switch assembly to close immediately upon power-on, providing grounding protection for the electrical equipment.

[0064] The above embodiments, by setting up switching devices and resistor networks in the switch control module, can achieve precise control of the PEN controllable switch assembly. Furthermore, the circuit can provide leakage protection for electrical equipment in both power-off and charging states, thereby improving the safety and reliability of the electrical equipment.

[0065] In one embodiment, Figure 5 As shown, the switch control module also includes a second protection unit and / or a third filtering unit. The second protection unit can be located between the control terminal and the power supply terminal RLY_PWR of the PEN controllable switch assembly, for example, a surge absorber ZNR (Zinc-Oxide Nonlinear Resistor) D20; the third filtering unit can be located between the control terminal and the ground terminal of the switching device Q12, for example, a filter capacitor C105.

[0066] Specifically, such as Figure 5 As shown, the second protection unit can be a surge absorber ZNRD20, positioned between the control terminal and the power supply terminal RLY_PWR of the PEN controllable switch assembly. This absorbs the reverse current during power failure to prevent damage to the PEN controllable switch assembly and the switching device Q12, thus protecting the circuit's safe operation. Furthermore, the third filtering unit can be a filter capacitor C105, positioned between the control terminal and ground terminal of the switching device Q12. This filters out high-frequency noise and interference from the input signal, ensuring that the switching device Q12 receives a clear and stable control signal, thereby improving the accuracy and response speed of the PEN controllable switch assembly.

[0067] The above embodiments enhance the reliability of the switch control module and improve the signal quality of the switch control signal by setting a second protection unit and a third filtering unit in the switch control module.

[0068] In one embodiment, the electrical equipment further includes a voltage detection module connected to the control module. This voltage detection module can detect the voltage at the grid-side input terminal, such as the voltage between the phase line and the neutral line on the grid side, and output a voltage detection signal. Additionally, the electrical equipment is connected to a second leakage current detection module, which can detect a second leakage current at the grid-side input terminal and output a second leakage current detection signal. The control module can receive the second leakage current detection signal, for example, referring to… Figure 1 The second leakage current detection module can be an RCD in the PME system. Furthermore, the control module can receive the first leakage current detection signal detected on the PEN line and the second leakage current detection signal detected by the second leakage current detection module located at the grid-side input terminal, and generate a PME alarm signal based on the first and second leakage current detection signals to prompt the user to move away from the fault area or stop charging.

[0069] In the above embodiments, the control module can generate a PME alarm signal in at least one of the following scenarios: First, the control module generates a PME alarm signal when it detects that a first leakage current detection signal is greater than or equal to a preset first current threshold, and the second leakage current detection module does not detect a second leakage current detection signal. Second, the control module generates a PME alarm signal when it detects that a first leakage current detection signal is greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and a voltage detection signal is greater than a preset first voltage threshold, and the second leakage current detection module does not detect a second leakage current detection signal. Third, the control module generates a PME alarm signal when it detects that the duration for which a voltage detection signal is greater than a preset second voltage threshold exceeds the response time corresponding to the second voltage threshold.

[0070] It is understood that the thresholds for the above-mentioned alarm scenarios can be set according to the actual situation. For example, the first current threshold can be set to 25mA, the second current threshold and the third current threshold can be set to 18mA and 25mA respectively, the first voltage threshold and the second voltage threshold can both be set to a voltage deviation of more than ±10% of the input voltage (i.e., the voltage between the phase line and the neutral line), the response time can be set to 5s, etc. This embodiment does not make specific limitations here.

[0071] Specifically, the voltage detection module can detect the voltage between the phase line and neutral line on the grid side in real time and output the voltage detection signal to the control module, so that the control module can monitor the stability of the grid side input voltage in real time. Furthermore, the second leakage current detection module can detect the second leakage current at the grid side input terminal and output the detected second leakage current detection signal to the control module, so that the control module can monitor whether there is excessive leakage current on the grid side. The setting location and leakage current detection principle of the second leakage current detection module can be referred to the RCD section above, and will not be repeated here. Based on this, when performing grounding or leakage fault detection, the control module can not only receive the first leakage current detection signal from the PEN line, but also combine the voltage detection signal and the second leakage current detection signal for a comprehensive judgment.

[0072] In various scenarios, the control module can generate PME alarm signals to address different safety risks. For example, when an abnormal increase in the first leakage current detection signal is detected while the second leakage current detection module fails to detect the second leakage current detection signal, it indicates a possible leakage fault has occurred upstream of the second leakage current detection module, such as a neutral line disconnection. In this case, a PME alarm signal can be generated to alert the user to move away from the potential leakage area. Furthermore, if the first leakage current detection signal is within a certain range and an abnormal change in the input voltage is detected, but the second leakage current detection module still fails to detect the second leakage current detection signal, an alarm can also be triggered to alert the user to move away from the leakage area. Additionally, if the voltage remains abnormal for an extended period, it can also be considered a potential hazard, and a PME alarm signal can be issued to ensure the user's electrical safety.

[0073] It should be noted that the PME alarm function of the electrical equipment provided in this embodiment is mainly achieved through the circuit connection between the control module, the voltage detection module, and the second leakage current detection module, and does not depend on the program in the control module. For the control module, its condition judgment function can be implemented using a program module provided by existing technology.

[0074] The above embodiments, by integrating a voltage detection module and a second leakage current detection module into the electrical equipment to work in conjunction with the control module, can achieve comprehensive monitoring and protection of the input voltage and leakage current on the power grid side. Compared with the traditional methods of detecting leakage faults in circuits through RCD or input voltage in the prior art, this embodiment, through multi-module collaboration and multi-condition judgment mechanism, can significantly improve the leakage protection capability and fault early warning level of electrical equipment, thereby effectively reducing the risk of safety accidents caused by safety hazards such as leakage and overvoltage, and providing users with a safer and more reliable power environment.

[0075] In one embodiment, the control module is also communicatively connected to the information indication module of the electrical equipment, wherein the control module is also used to output a PME alarm signal to the information indication module so that the information indication module indicates the PME alarm signal.

[0076] Specifically, when the control module detects abnormal conditions such as leakage or overvoltage, it can issue a PME alarm signal and output the PME alarm signal to the electrical equipment's information indication module. Upon receiving the PME alarm signal, the information indication module can clearly indicate the existing safety hazard to the user through sound and light, a display screen, or other visual and auditory means. This immediate and intuitive indication method can effectively improve the user's perception of the electrical equipment's safety status, enabling the user to react quickly and take necessary measures, such as cutting off the power supply and moving away from the fault area, thereby avoiding potential safety risks.

[0077] The above embodiments enable rapid transmission and effective indication of PME alarm signals by connecting the control module and the information indication module through communication and controlling their collaborative operation, thereby enhancing the safety protection capability of electrical equipment.

[0078] In one embodiment, the electrical equipment further includes a voltage detection module connected to the control module. This voltage detection module can detect the voltage at the grid-side input terminal, such as the voltage between the phase line and the neutral line on the grid side, and output a voltage detection signal. Additionally, the electrical equipment is connected to a second leakage current detection module, which can detect a second leakage current at the grid-side input terminal and output a second leakage current detection signal. The control module can receive the second leakage current detection signal, for example, referring to… Figure 1 The second leakage current detection module can be an RCD in the PME system. Furthermore, the control module can receive the first leakage current detection signal detected on the PEN line and the second leakage current detection signal detected by the second leakage current detection module located at the grid-side input terminal, and output a switch control signal through the first and second leakage current detection signals to control the PEN controllable switch assembly to disconnect, thereby preventing the user from being electrocuted.

[0079] In the above embodiments, the control module can output a switch control signal to control the PEN controllable switch component to disconnect under at least one of the following scenarios: First, when the control module detects a first leakage current detection signal greater than or equal to a preset first current threshold, and the second leakage current detection module does not detect a second leakage current detection signal, the control module outputs a switch control signal to control the PEN controllable switch component to disconnect. Second, when the control module detects a first leakage current detection signal greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and a voltage detection signal greater than a preset first voltage threshold, and the second leakage current detection module does not detect a second leakage current detection signal, the control module outputs a switch control signal to control the PEN controllable switch component to disconnect. It is understood that under the above conditions, other rules such as response time and hazard level can be used to further enhance the safety protection level of the electrical equipment.

[0080] It is understood that the thresholds for the above-mentioned alarm scenarios can be set according to the actual situation. For example, a current threshold can be set to 25mA, a second current threshold and a third current threshold can be set to 18mA and 25mA respectively, and a first voltage threshold can be set to a voltage deviation of more than ±10% of the input voltage (i.e., the voltage between the phase line and the neutral line), etc. This embodiment does not make specific limitations here.

[0081] Specifically, the voltage detection module can detect the voltage between the phase line and neutral line on the grid side in real time and output the voltage detection signal to the control module, so that the control module can monitor the stability of the grid side input voltage in real time. Furthermore, the second leakage current detection module can detect the second leakage current at the grid side input terminal and output the detected second leakage current detection signal to the control module, so that the control module can monitor whether there is excessive leakage current on the grid side. The setting location and leakage current detection principle of the second leakage current detection module can be referred to the RCD section above, and will not be repeated here. Based on this, when performing grounding or leakage fault detection, the control module can not only receive the first leakage current detection signal from the PEN line, but also combine the voltage detection signal and the second leakage current detection signal for a comprehensive judgment.

[0082] In various scenarios, the control module can output a switch control signal to control the PEN controllable switch assembly to disconnect, thereby cutting off the current path and preventing users from touching the PEN line and posing a risk of electric shock. For example, if an abnormal increase in the first leakage current detection signal is detected while the second leakage current detection module does not detect a second leakage current detection signal, it indicates a possible leakage fault has occurred upstream of the second leakage current detection module, such as a break in the neutral wire at the far end. In this case, the control module can disconnect the PEN controllable switch assembly to prevent users from being electrocuted. Furthermore, if the first leakage current detection signal is detected within a certain range and an abnormal change in the input voltage is detected, but the second leakage current detection module still does not detect a second leakage current detection signal, the PEN controllable switch assembly can also be triggered to disconnect, thus preventing users from being electrocuted.

[0083] It should be noted that the function of controlling the PEN controllable switch assembly to disconnect to prevent electric shock in the electrical equipment provided in this embodiment is mainly achieved through the circuit connection between the control module, the voltage detection module, the second leakage current detection module, and the PEN controllable switch assembly, and does not depend on the program in the control module. For the control module, its condition judgment function can be implemented using a program module provided by existing technology.

[0084] The above embodiments, by integrating a voltage detection module and a second leakage current detection module into the electrical equipment to work in conjunction with the control module, can achieve comprehensive monitoring and protection of the input voltage and leakage current on the power grid side. Compared with the traditional methods of detecting leakage faults in circuits through RCD or input voltage in the prior art, this embodiment, through multi-module collaboration and multi-condition judgment mechanism, can significantly improve the leakage protection capability of electrical equipment, thereby effectively reducing the risk of safety accidents caused by safety hazards such as leakage and overvoltage, and providing users with a safer and more reliable power environment.

[0085] In one embodiment, the control module is also connected to the control terminal of the power switch of the electrical equipment. After outputting a switch control signal to control the PEN controllable switch assembly to disconnect, the control module can also output a power switch control signal to control the power switch to disconnect, thereby pausing charging.

[0086] Specifically, the control module can also be connected to the control terminal of the power switch in the electrical equipment. In this embodiment, when the control module detects a potential safety risk (such as leakage risk) in the electrical equipment, it can output a switch control signal to control the PEN controllable switch assembly to open, and then output a power switch control signal to control the power switch to open. In this way, not only can the current path be cut off, but the charging process of the electrical equipment can also be paused, thereby preventing further safety problems that may arise from continuous charging.

[0087] The above embodiments, by controlling the power switch, can provide immediate response and comprehensive protection in the event of a safety incident. This not only effectively isolates potential hazards such as leakage current but also ensures the safe and controllable charging process, thus providing dual protection for the stable operation of electrical equipment and the safety of users.

[0088] In one embodiment, the voltage detection signal detection method includes: in a three-phase system, detecting the phase voltages of the three phase lines respectively and calculating their vector sum to obtain the voltage detection signal; in a single-phase system, detecting the voltage between the phase line and the neutral line as the voltage detection signal.

[0089] Specifically, to meet the adaptability requirements of electrical equipment in different power systems, the voltage detection module can flexibly adopt different voltage detection methods to obtain voltage detection signals. In this embodiment, in a three-phase system, the voltage detection module can detect the phase voltages of the three phase lines separately and calculate their vector sum to obtain the voltage detection signal. The vector sum of the phase voltages can be calculated in the control module or in the voltage detection module itself; this embodiment does not impose a specific limitation. Furthermore, the calculation method for the vector sum of phase voltages can be implemented using existing program modules, or through analog circuits, digital circuits, or other methods; this embodiment also does not impose a specific limitation. The vector sum of phase voltages characterizes the imbalance of the power system and also the degree of danger should the neutral line break. The above detection method fully considers the complexity of three-phase systems and ensures the comprehensiveness and accuracy of voltage detection. Furthermore, in a single-phase system, the voltage detection module only needs to detect the voltage between any one phase line and the neutral line as the voltage detection signal, simplifying the voltage detection process and improving voltage detection efficiency.

[0090] The above embodiments, by providing diverse voltage detection methods, not only meet the application needs of electrical equipment in different power systems, but also ensure the accuracy and reliability of voltage detection, thereby providing more possibilities for the flexible application of electrical equipment in different scenarios.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An electrical device, characterized in that, The electrical equipment is installed in the PME system, and the electrical equipment includes: The PEN controllable switch assembly is connected to the PEN line and is used to disconnect or connect the PEN line. The first leakage current detection module is connected in series with the PEN controllable switch assembly on the PEN line, and is used to detect the first leakage current on the PEN line when the PEN controllable switch assembly is closed, and output the first leakage current detection signal. A signal processing module is connected to the output terminal of the first leakage current detection module and is used to process the first leakage current detection signal. The control module is connected to the output of the signal processing module and is used to receive the processed first leakage current detection signal and generate a switch control signal based on the first leakage current detection signal. A switch control module is connected to the output terminal of the control module and the control terminal of the PEN controllable switch assembly, and is used to control the PEN controllable switch assembly to close or open based on the switch control signal.

2. The electrical equipment according to claim 1, characterized in that, The first leakage current detection module includes a current transformer and a reference voltage source, wherein, The first input terminal of the current transformer is connected to the first end of the PEN line, the second input terminal of the current transformer is connected to the second end of the PEN line, the first output terminal of the current transformer is connected to the reference voltage source, and the second output terminal of the current transformer is connected to the input terminal of the signal processing module as the output terminal of the first leakage current detection module.

3. The electrical equipment according to claim 2, characterized in that, The first leakage current detection module further includes a first filtering unit, wherein, The first filter unit is connected between the first output terminal and the ground terminal of the current transformer.

4. The electrical equipment according to claim 2, characterized in that, The signal processing module includes an operational amplifier and several resistors, wherein, The negative input terminal of the operational amplifier is connected to the output terminal of the first leakage current detection module, the positive input terminal of the operational amplifier is connected to the reference voltage source, the output terminal of the operational amplifier is connected to the negative input terminal of the operational amplifier through a feedback resistor, and the output terminal of the operational amplifier is also connected to the input terminal of the control module through a filter resistor.

5. The electrical equipment according to claim 4, characterized in that, The signal processing module further includes a matching resistor, wherein, The matching resistor is connected in series between the output terminal of the first leakage current detection module and the negative input terminal of the operational amplifier, and the resistance value of the matching resistor is greater than the internal resistance of the current transformer.

6. The electrical equipment according to claim 4 or 5, characterized in that, The signal processing module further includes a first protection unit and / or a second filtering unit, wherein, The first protection unit is disposed between the positive input terminal and the negative input terminal of the operational amplifier, and / or, the first protection unit is disposed between the output terminal and the power supply terminal of the operational amplifier, and / or, the first protection unit is disposed between the output terminal and the ground terminal of the operational amplifier; and / or, The second filter unit is disposed between the negative input terminal and the output terminal of the operational amplifier, and / or the second filter unit is disposed between the output terminal and the ground terminal of the operational amplifier.

7. The electrical equipment according to claim 1, characterized in that, The switch control module includes a switching device or several resistors, wherein, The control terminal of the switching device is connected to the output terminal of the control module through a current-limiting resistor. The control terminal of the switching device is also connected to the power supply terminal through a pull-up resistor. The control terminal of the switching device is also grounded through a pull-down resistor. The first end of the switching device is connected to the control end of the PEN controllable switch assembly, the first end of the switching device is also connected to the power supply end, and the second end of the switching device is grounded.

8. The electrical equipment according to claim 7, characterized in that, The switch control module further includes a second protection unit and / or a third filtering unit, wherein, The second protection unit is disposed between the control terminal and the power supply terminal of the PEN controllable switch assembly; and / or, The third filtering unit is disposed between the control terminal and the ground terminal of the switching device.

9. The electrical equipment according to claim 1, characterized in that, The electrical equipment also includes a voltage detection module connected to the control module. The voltage detection module is used to detect the voltage at the grid input terminal and output a voltage detection signal. The electrical equipment is also connected to a second leakage current detection module. The second leakage current detection module is used to detect the second leakage current at the grid input terminal and output a second leakage current detection signal. The control module is used to receive the second leakage current detection signal. When the control module detects that the first leakage current detection signal is greater than or equal to a preset first current threshold and the second leakage current detection module does not detect the second leakage current detection signal, it generates a PME alarm signal. And / or, When the control module detects that the first leakage current detection signal is greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and the voltage detection signal is greater than a preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, it generates a PME alarm signal. And / or, When the control module detects that the duration of the voltage detection signal being greater than a preset second voltage threshold exceeds the response time corresponding to the second voltage threshold, it generates a PME alarm signal.

10. The electrical equipment according to claim 9, characterized in that, The control module is also communicatively connected to the information indication module of the electrical equipment, wherein... The control module is also used to output the PME alarm signal to the information indication module, so that the information indication module indicates the PME alarm signal.

11. The electrical equipment according to claim 1, characterized in that, The electrical equipment also includes a voltage detection module connected to the control module. The voltage detection module is used to detect the voltage at the grid input terminal and output a voltage detection signal. The electrical equipment is also connected to a second leakage current detection module. The second leakage current detection module is used to detect the second leakage current at the grid input terminal and output a second leakage current detection signal. The control module is used to receive the second leakage current detection signal. When the control module detects that the first leakage current detection signal is greater than or equal to a preset first current threshold and the second leakage current detection module does not detect a second leakage current detection signal, it outputs a switch control signal to control the PEN controllable switch assembly to disconnect. And / or, When the control module detects that the first leakage current detection signal is greater than or equal to a preset second current threshold and less than or equal to a preset third current threshold, and the voltage detection signal is greater than a preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, it outputs a switch control signal to control the PEN controllable switch assembly to disconnect.

12. The electrical equipment according to claim 11, characterized in that, The control module is also connected to the control terminal of the power switch of the electrical equipment, wherein... After outputting a switch control signal to control the PEN controllable switch assembly to disconnect, the control module is also used to output a power switch control signal to control the power switch to disconnect, thereby pausing charging.

13. The electrical equipment according to claim 9 or 11, characterized in that, The detection methods for the voltage detection signal include: In a three-phase system, the phase voltages of the three phase lines are detected separately and their vector sum is calculated to obtain the voltage detection signal; In a single-phase system, the voltage between the phase line and the neutral line is used as the voltage detection signal.

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