Electrical equipment, control method thereof, storage medium and computer equipment

Abstract

The invention discloses electrical equipment and a control method thereof, a storage medium and computer equipment. The electrical equipment comprises a PEN controllable switch assembly which is connected to a PEN line; the first leakage current detection module and the PEN controllable switch assembly are connected in series on the PEN line, and the first leakage current detection module is used for detecting first leakage current on the PEN line 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] The present application relates to the field of charging control technology, and in particular to an electrical device and a control method thereof, a storage medium and a computer device. Background Art

[0002] In the charging system, the PME system refers to a specific type of grounding system in which the neutral line (N) and the protective earth line (PE) are connected together to form a PEN line, that is, the PEN line is a common line for the PE line and the N line. When connecting electrical equipment, the N line and the PEN line need to be connected to each electrical equipment separately, and then the PEN line is uniformly connected to the ground for grounding protection of each electrical equipment.

[0003] In order to avoid electric shock accidents in the PME system when the power grid is abnormal, a PEN switch component is usually set on the PEN line of the PME system to monitor whether the voltage vector sum of the phase line exceeds the threshold. Once the voltage is detected to be too high, the PEN switch component will be controlled to disconnect to interrupt the charging process, thereby preventing possible electric shock hazards and equipment damage.

[0004] However, in the PME system, the connection method of directly connecting the PE line to the N line has certain safety hazards. For example, when the remote N line (also known as the PEN line) is disconnected, the N line and the PE line will be in a floating state. If the three-phase power grid is in a state of equilibrium in the local area at this time, the charging pile can work normally. However, if the user touches the PE line, it will cause an electric shock accident. For such faults, the voltage detection module will not trigger the protection function of the PEN switch component because it cannot detect the problem of excessive voltage, which will cause irreversible damage. Summary of the invention

[0005] In view of this, the embodiments of the present application provide an electrical device and a control method thereof, a storage medium and a computer device, the main purpose of which is to solve the technical problem of poor safety and reliability of electrical equipment in a PME system.

[0006] According to one aspect of the present application, an electrical device is provided, the electrical device comprising:

[0007] A PEN controllable switch component, connected to the PEN line, for disconnecting or connecting the PEN line;

[0008] A first leakage current detection module, connected in series with the PEN controllable switch component on the PEN line, for detecting a first leakage current on the PEN line when the PEN controllable switch component is closed, and outputting a first leakage current detection signal;

[0009] a signal processing module, connected to the output end of the first leakage current detection module, and configured to process the first leakage current detection signal;

[0010] a control module connected to the output end of the signal processing module, configured to receive the processed first leakage current detection signal and generate a switch control signal based on the first leakage current detection signal;

[0011] The switch control module is connected to the output end of the control module and the control end of the PEN controllable switch component, and is used to control the PEN controllable switch component to be closed or opened 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 end of the current transformer is connected to the first end of the PEN line, the second input end of the current transformer is connected to the second end of the PEN line, the first output end of the current transformer is connected to the reference voltage source, and the second output end of the current transformer is connected to the input end of the signal processing module as the output end of the first leakage current detection 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 of the current transformer and a ground terminal.

[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 end of the first leakage current detection module and the negative input end of the operational amplifier, and the resistance of the matching resistor is greater than the internal resistance of the current transformer.

[0016] In one embodiment, the signal processing module also includes a first protection unit and / or a second filtering unit, wherein the first protection unit is arranged between the positive input terminal of the operational amplifier and the negative input terminal of the operational amplifier, and / or the first protection unit is arranged between the output terminal and the power supply terminal of the operational amplifier, and / or the first protection unit is arranged between the output terminal and the ground terminal of the operational amplifier; and / or the second filtering unit is arranged between the negative input terminal of the operational amplifier and the output terminal of the operational amplifier, and / or the second filtering unit is arranged 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 end of the switch device is connected to the output end of the control module through a current limiting resistor, the control end of the switch device is also connected to the power supply end through a pull-up resistor, and the control end of the switch device is also grounded through a pull-down resistor; the first end of the switch device is connected to the control end of the PEN controllable switch component, the first end of the switch device is also connected to the power supply end, and the second end 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 arranged between the control end and the power supply end of the PEN controllable switch component; and / or the third filtering unit is arranged between the control end and the ground end of the switch device.

[0019] In one embodiment, the electrical device further comprises a voltage detection module connected to the control module, the voltage detection module is used to detect the voltage of the grid-side input terminal and output a voltage detection signal; and the electrical device is connected to a second leakage current detection module, the second leakage current detection module is used to detect a second leakage current of the grid-side input terminal and output a second leakage current detection signal, and the control module is 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 voltage detection signal is greater than the preset second voltage threshold for a duration exceeding a response duration corresponding to the second voltage threshold.

[0020] In one embodiment, the control device is also communicatively connected to an information indication module of the electrical equipment, wherein the control device 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 device further includes a voltage detection module connected to the control module, the voltage detection module is used to detect the voltage at the grid-side input terminal and output a voltage detection signal; and the electrical device is connected to a second leakage current detection module, the second leakage current detection module is used to detect a second leakage current at the grid-side input terminal and output a second leakage current detection signal, and the control module is used to receive the second leakage current detection signal; the control module generates a switch control signal based on the first leakage current detection signal and the second leakage current detection signal; the control module detects that the first leakage current detection signal is greater than or equal to a preset first current threshold, and the When the second leakage current detection module does not detect the second leakage current detection signal, the switch control signal is output to control the PEN controllable switch component to disconnect; and / or, the control module generates a switch control signal based on the first leakage current detection signal, the voltage detection signal and 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 second current threshold and less than or equal to a preset third current threshold, and the voltage detection signal is greater than the preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, the switch control signal is output to control the PEN controllable switch component to disconnect.

[0022] In one embodiment, the control device is also connected to the control end of the power switch of the electrical equipment, wherein, after the control module outputs the switch control signal to control the PEN controllable switch component to disconnect, it is also used to output a power switch control signal to control the power switch to disconnect so as to suspend charging.

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

[0024] According to another aspect of the present application, a control method for an electrical device is provided. The method can be applied to the electrical device described in any one of the above embodiments. The method includes:

[0025] When in the charging state, receiving in real time a first leakage current detection signal collected on a PEN line, wherein a PEN controllable switch component is provided on the PEN line, and in the charging state, the PEN controllable switch component is in a closed state;

[0026] When it is detected 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 connected to the electrical equipment does not detect the second leakage current detection signal, a PME alarm signal is output, and / or a switch control signal is output to control the PEN controllable switch component to disconnect.

[0027] In one embodiment, the method further includes: when it is detected 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 at the grid-side input terminal is greater than the preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, outputting a PME alarm signal, and / or outputting a switch control signal to control the PEN controllable switch component to disconnect.

[0028] In one embodiment, the first current threshold includes at least one first current threshold corresponding to a danger level, and the first current threshold of each danger level is preset with a corresponding response time; when it is detected that the first leakage current detection signal is greater than or equal to the preset first current threshold, and the second leakage current detection module connected to the electrical equipment does not detect the second leakage current detection signal, a PME alarm signal is output, and / or a switch control signal is output to control the PEN controllable switch component to disconnect, including: when it is detected that the first leakage current detection signal is greater than or equal to the first current threshold corresponding to any danger level for a duration exceeding the response time corresponding to the danger level, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and a switch control signal is output to control the PEN controllable switch component to disconnect.

[0029] In one embodiment, the method further includes: when it is detected that the first leakage current detection signal is greater than or equal to the first current threshold corresponding to a danger level higher than the current danger level, and the duration exceeds the response duration corresponding to the higher danger level, and the second leakage current detection module does not detect the second leakage current detection signal, outputting a PME alarm signal and outputting a switch control signal to control the PEN controllable switch component to disconnect, wherein the response duration corresponding to the higher danger level is shorter than the response duration corresponding to the current danger level.

[0030] In one embodiment, when it is detected 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 at the grid-side input terminal is greater than a preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and / or a switch control signal is output to control the PEN controllable switch component to disconnect, including: when it is detected that the first leakage current detection signal is greater than or equal to the second current threshold and less than or equal to the third current threshold for a duration exceeding a response duration corresponding to the first voltage threshold, and the voltage detection signal is greater than the first voltage threshold for a duration exceeding a response duration corresponding to the first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and a switch control signal is output to control the PEN controllable switch component to disconnect.

[0031] In one embodiment, the method further includes: outputting a PME alarm signal when it is detected that the voltage detection signal at the grid-side input terminal is greater than a preset second voltage threshold for a duration exceeding a response duration corresponding to the second voltage threshold.

[0032] In one embodiment, the detection method of the voltage detection signal includes: in a three-phase system, respectively detecting the phase voltages of the three phase lines and calculating their vector sum to obtain a voltage detection signal; in a single-phase system, detecting the voltage between the phase line and the neutral line as a voltage detection signal.

[0033] In one embodiment, after the outputting of the switch control signal to control the PEN controllable switch component to be disconnected, the method further comprises: outputting a power switch control signal to control the power switch to be disconnected to suspend charging.

[0034] In one embodiment, when in the charging state, before receiving the first leakage current detection signal collected on the PEN line in real time, the method also includes: responding to a charging instruction, outputting a switch control signal and a power switch control signal to control the PEN controllable switch component and the power switch to be closed to start charging.

[0035] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the control method of the electrical device described above is implemented.

[0036] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the control method of the above-mentioned electrical device when executing the program.

[0037] By means of the above technical solution, the embodiment of the present application provides an electrical device and a control method thereof, a storage medium and a computer device, wherein the electrical device comprises a PEN controllable switch component and a first leakage current detection module arranged on a PEN line. The first leakage current detection module can be used to detect the leakage current on the PEN line and output a first leakage current detection signal. The first leakage current detection signal can be input into the control module after being processed by the signal processing module. The control module can judge whether there is excessive leakage current on the PEN line through the first leakage current detection signal, and output a switch control signal to control the PEN controllable switch component on the PEN line to close or open, thereby realizing the electrical protection function. The electrical device can protect the electrical equipment in the PME system through leakage current detection on the PEN line and switch control of the PEN controllable switch component when a leakage fault occurs. In particular, when a fault such as a disconnection of the remote N line occurs, the residual current action protector arranged at the input end of the grid side cannot detect the residual current, and thus there is a considerable safety hazard. In contrast, the above-mentioned electrical equipment can detect excessive leakage current on the PEN line through the first leakage current detection module, so that the connection of the PEN controllable switch component can be cut off in time, so that the PE line of the electrical equipment is not energized, thereby protecting users from the risk of electric shock, thereby improving the safety and reliability of the electrical equipment.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 A schematic diagram of the system structure of a PME system provided in an embodiment of the present application is shown;

[0041] Figure 2 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application is shown;

[0042] Figure 3 A circuit diagram of a first leakage current detection module provided in an embodiment of the present application is shown;

[0043] Figure 4 A circuit diagram of a signal processing module provided in an embodiment of the present application is shown;

[0044] Figure 5A circuit diagram of a switch control module provided in an embodiment of the present application is shown;

[0045] Figure 6 A schematic diagram showing a flow chart of a control method for an electrical device provided in an embodiment of the present application is shown;

[0046] Figure 7 A schematic diagram showing a flow chart of a control method for an electrical device provided in an embodiment of the present application is shown;

[0047] Figure 8 A flow chart of a control method for an electrical device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0049] PME system (Protective Multiple Earthing system) refers to a specific type of grounding system. Figure 1 In the PME system, the neutral line (N line) and the protective ground line (PE line) are connected together before entering the house, becoming the PEN line (i.e. the common line of the protective ground and the neutral line). When connecting electrical equipment, the N line and the PEN line need to be connected to each electrical equipment separately, and then the PEN line is uniformly connected to the ground for unified grounding protection of the electrical equipment after entering the house.

[0050] In contrast, non-PME systems refer to those systems that do not use PME configuration. They mainly include TN-S system, IT system and TT system, etc. In the TN-S system, the neutral point on the power supply side is directly grounded, and the N line and PE line are completely separated in the latter system; in the IT system, the neutral line may not be grounded or grounded through high impedance, and in the TT system, the neutral point on the power supply side is directly grounded, and the exposed conductive parts of the electrical equipment are grounded separately through the PE line.

[0051] Based on this, the main difference between the PME system and the non-PME system is that the PE line in the PME system is separated from the PEN line, while the PE line and the N line in the non-PME system are only grounded at the neutral point on the power supply side, while the N line and the PE line on the power equipment side are always insulated. This difference affects the connection method of the power equipment. Based on the above connection method, in the PME system, once the PEN line fails to connect, it may cause safety hazards. At this time, the shell and PE line of the power equipment may be energized, which may cause electric shock accidents. In the non-PME system, such as the TN-S system, the power system end of the PE line and the shell of the power equipment are stably grounded, and there will be no safety risks caused by the breakage of the N line causing the shell and PE line of the power equipment to be energized.

[0052] by Figure 1 Taking the scenario shown as an example, in the PME system, when the remote N line is disconnected, the phase line (L line) in the power grid will form a connection loop with the N line through the power-consuming equipment, causing the PEN line to be energized. If the user touches the PE line, an electric shock accident will occur. In the prior art, for faults in the PME system, the voltage U1 between the L line and the N line is mainly detected. Once it is detected that the variation range of the voltage U1 exceeds the threshold, the PEN switch component will be controlled to disconnect, thereby triggering the protection function.

[0053] However, there are still some loopholes in the judgment method in the prior art. They mainly include the following aspects: First, when the charging system is unbalanced, the voltage U1 will deviate, which is easy to cause false alarms, that is, a PME fault alarm is issued or the PEN switch component is disconnected when no PME fault occurs. Secondly, after a PME fault occurs, if the N line floats (that is, the N line is broken at the far end), a voltage will be generated on the N line, but if the power grid tends to be balanced at this time, the N line may have a relatively small voltage difference to the earth. At this time, the fault state cannot be detected by the voltage U1, but if the N line is touched at this time, there will be current. If an electric shock accident occurs, it is not enough to pull the power grid out of the balanced state, so there will be a risk of continued electric shock. Finally, RCD (Residual Current Device, residual current action protector) cannot detect the voltage floating caused by the far-end break of the N line of the PME system. The detection principle of RCD 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. Moreover, the RCD can only detect leakage in the subsequent stage, but not in the preceding stage. When the N line is broken at the far end, it is broken in the preceding stage of the RCD, so there will be no obvious residual current flowing through the RCD, causing the RCD to be unable to detect abnormalities, thus not triggering the protection function of the PEN switch component, and therefore unable to prevent possible electric shock accidents.

[0054] In view of the potential safety hazard in the PME system, in order to improve the safety and reliability of the electrical equipment in the PME system, this embodiment provides an electrical equipment, such as Figure 2 As shown, the electrical device includes a PEN controllable switch component 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 component 10 is connected to the PEN line to disconnect or conduct the PEN line; the first leakage current detection module 20 is connected in series with the PEN controllable switch component 10 to the PEN line to detect the first leakage current on the PEN line when the PEN controllable switch component is closed, and output a first leakage current detection signal; the signal processing module 30 is connected to the output end 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 end 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 end of the control module 40 and the control end of the PEN controllable switch component 10 to control the PEN controllable switch component 10 to close or disconnect based on the switch control signal.

[0055] Specifically, when the electrical device starts charging, the PEN controllable switch component 10 can be controlled to close so that the PEN line is turned on and ground protection is performed. 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. Among them, the signal processing module 30 can filter, amplify, adjust the signal range and other processing on the first leakage current detection signal, 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 into the control module 40 for monitoring and judging the leakage current. Further, when the control module 40 detects that there is an excessive leakage current on the PEN line through the processed first leakage current detection signal, it can be considered that there is a leakage risk in the electrical device at this time. At this time, the control module 40 can output a switch control signal to control the PEN controllable switch component 10 to disconnect, thereby avoiding electric shock accidents caused by contact with the electrical device.

[0056] In this embodiment, the composition and setting of the PEN controllable switch component 10 are not limited. In an optional embodiment, the PEN controllable switch component 10 can be a PEN relay, wherein the normally open switch of the PEN relay can be connected in series to the PEN line to disconnect or conduct the PEN line; one end of the coil of the PEN relay is connected to the power supply end, and the other end is connected to the output end of the switch control module 50, which is used to control the normally open switch of the PEN relay to close or disconnect based on the switch control signal output by the switch control module 50, so as to prevent possible electric shock accidents. In other optional embodiments, the PEN controllable switch component 10 can also be other types of switch components such as contactors, which are not limited in this embodiment.

[0057] It should be noted that the specific method in which the control module 40 judges the risk of leakage based on the processed first leakage current detection signal can be set based on the actual situation. For example, the control module 40 can compare the first leakage current detection signal with the preset current threshold and the detection result of the RCD to determine whether the electrical equipment has a leakage fault, or the control module 40 can also make an auxiliary judgment based on the deviation range of the input voltage and the detection result of the RCD to determine whether the electrical equipment has a leakage fault. In addition, the control module 40 can also send a PME alarm signal to prompt the user to stay away from the electric shock area. This embodiment does not specifically limit the judgment logic inside the control module 40, the PME alarm method and the PME protection method.

[0058] The electrical equipment provided in the above embodiment includes a PEN controllable switch component and a first leakage current detection module arranged on a PEN line. Among them, the first leakage current detection module can be used to detect the leakage current on the PEN line and output a first leakage current detection signal. The first leakage current detection signal can be input into the control module after being processed by the signal processing module. The control module can judge whether there is excessive leakage current on the PEN line through the first leakage current detection signal, and output a switch control signal to control the PEN controllable switch component on the PEN line to close or open, thereby realizing the electrical protection function. The above electrical equipment can protect the electrical equipment in the PME system through leakage current detection on the PEN line and switch control of the PEN controllable switch component when a leakage fault occurs. In particular, when a fault such as a disconnection of the remote N line occurs, the residual current action protector arranged at the input end of the grid side cannot detect the residual current, and thus there is a considerable safety hazard. In contrast, the above-mentioned electrical equipment can detect excessive leakage current on the PEN line through the first leakage current detection module, so that the connection of the PEN controllable switch component can be cut off in time, so that the PE line of the electrical equipment is not energized, thereby protecting users from the risk of electric shock, thereby improving the safety and reliability of the electrical equipment.

[0059] In one embodiment, Figure 3 As shown, the first leakage current detection module includes a current transformer CT1 and a reference voltage source Vref. Among them, the first input terminal 4 of the current transformer CT1 is connected to the first end PME_IN of the PEN line, the second input terminal 3 of the current transformer is connected to the second end 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 is connected to the input terminal of the signal processing module as the output terminal of the first leakage current detection module, and is used to output the first leakage current detection signal PE_CURR to the signal processing module.

[0060] Specifically, the first leakage current detection module can detect the leakage current on the PEN line by integrating the current transformer CT1 and the reference voltage source Vref. In this embodiment, the current transformer CT1 can be used to detect the current between the first end PME_IN and the second end PME_OUT of the PEN line. Among them, the first input terminal 4 and the second input terminal 3 of CT1 are respectively connected to the two ends of the PEN line, which can be used to capture the current signal flowing through the PEN line, and the first output terminal 1 of CT1 is connected to the reference voltage source Vref, which can provide a stable reference voltage for current detection. The second output terminal 2 of CT1 is connected to the input terminal of the signal processing module as the output terminal of the detection module, and can send the first leakage current detection signal PE_CURR to the signal processing module in real time.

[0061] The above embodiment can quickly and accurately detect the leakage current on the PEN line by setting a current transformer and a reference voltage source in the first leakage current detection module. Once an abnormal leakage current is detected, it means that there may be leakage. At this time, the first leakage current detection signal output will trigger the subsequent signal processing and control mechanism, so as to cut off the fault circuit in time or take other protective measures, so as to prevent electric shock accidents and electrical fires, and improve the safety and reliability of electrical equipment.

[0062] 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 a variety of filtering devices such as resistors and capacitors. For example, Figure 3 As shown, the first filter unit may include a decoupling capacitor C269, wherein the decoupling capacitor C269 may be connected between the first output terminal 1 of the current transformer CT1 and the ground terminal. It is understandable that the configuration of the first filter unit may be configured according to actual needs, and this embodiment is not specifically limited here.

[0063] Specifically, a first filtering unit may also be provided in the first leakage current detection module to improve the stability and accuracy of the first leakage current detection signal. In the present embodiment, the first filtering unit may be provided between the first output terminal 1 of the current transformer CT1 and the ground terminal. For example, the first filtering unit may be composed of a decoupling capacitor C269, and is used to filter out high-frequency noise and interference signals in the signal, thereby ensuring that the first leakage current signal output from CT1 can remain 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 method of the first filtering unit may also be adjusted according to the actual application scenario and requirements, and this embodiment is not specifically limited here.

[0064] In the above embodiment, by providing the first filtering unit in the first leakage current detection module, the detection precision and signal stability of the first leakage current detection signal can be improved, thereby enhancing the accuracy of leakage current detection.

[0065] In one embodiment, Figure 4 As shown, the signal processing module includes an operational amplifier U10B and a plurality of resistors. Among them, 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 PE_CURR output by the first leakage current detection module, the positive input terminal 5 of the 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 the operational amplifier U10B is connected to the negative input terminal 6 of the operational amplifier U10B through the feedback resistor R38, and the output terminal 7 of the operational amplifier U10B is also connected to the input terminal of the control module through the filter resistor R40, and is used to output the processed first leakage current detection signal PE_CURR_AD (MCU) to the control module.

[0066] Specifically, Figure 4 As shown, the negative input terminal 6 of the 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 into 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 to 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.

[0067] The above technical embodiment integrates an operational amplifier and a resistor network in the signal processing module to achieve amplification processing of the first leakage current detection signal and signal input range adjustment processing, thereby ensuring the accuracy and stability of the first leakage current detection signal, thereby ensuring the safe operation of the electrical equipment.

[0068] 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 end of the first leakage current detection module and the negative input terminal 6 of the operational amplifier U10B. In this embodiment, the resistance 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 of signal acquisition can be reduced.

[0069] Specifically, the matching resistor R39 can be connected in series between the output end of the first leakage current detection module and the negative input terminal 6 of the operational amplifier U10B, and its resistance value is set to be much larger than the internal resistance of the current transformer CT1, for example, it can be set to 10-15 times the internal resistance of the current transformer, which is equivalent to increasing the internal resistance of the current transformer CT1, so that the change of the winding resistance is relatively small compared to the overall internal resistance, so the consistency of the internal resistance value of the current transformer CT1 can be effectively improved. R39 reduces the problem of inconsistent signal delay caused by inconsistent internal resistance of the current transformer, and ensures the time consistency of 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 inconsistent delay of the signal during transmission and improving the overall performance of the signal processing module.

[0070] In one embodiment, Figure 4 As shown, the signal processing module also includes a first protection unit and / or a second filtering unit. The first protection unit can be set at at least one of the following positions: between the positive input terminal 5 of the operational amplifier U10B and the negative input terminal 6 of the operational amplifier U10B, such as D6 and D7, between the output terminal 7 of the operational amplifier U10B and the power supply terminal MCU_VCC, such as D4, between the output terminal 7 of the operational amplifier U10B and the ground terminal, such as D5. The second filtering unit can be set at at least one of the following positions: between the negative input terminal 6 of the operational amplifier U10B and the output terminal 7 of the operational amplifier U10B, such as C57, between the output terminal 7 of the operational amplifier U10B and the ground terminal, such as C58.

[0071] Specifically, the first protection unit can be set at some key positions of the signal processing module, such as setting diodes D6 and D7 at the input end of the operational amplifier U10B to protect the positive and negative inputs of the operational amplifier U10B, setting diode D4 between the output end of the operational amplifier U10B and the power supply end MCU_VCC to prevent overvoltage, and setting diode D5 between the output end and the ground end of the operational amplifier U10B to protect the output from short circuit. This embodiment can effectively prevent damage to the circuit caused by abnormal voltage or short circuit by setting the first protection unit in the signal processing module. Further, the second filtering unit can be set at an appropriate position of the signal path in the signal processing module, such as setting the filter capacitor C57 between the negative input end 6 and the output end 7 of the operational amplifier U10B to filter out high-frequency noise, and setting the filter capacitor C58 between the output end 7 and the ground end of the operational amplifier U10B to filter out high-frequency noise in the processed first leakage current detection signal to ensure the purity and stability of the output signal.

[0072] The above embodiment can improve the protection capability and signal quality of the circuit by setting the first protection unit and the second filtering unit in the signal processing module, thereby enhancing the reliability and safety of the electrical equipment and providing a strong guarantee for the stable operation of the electrical equipment.

[0073] In one embodiment, Figure 5 As shown, the switch control module includes a switch device Q12 or a plurality of resistors. Among them, the control end of the switch device Q12 is connected to the output end of the control module through the current limiting resistor R120, and is used to receive the switch control signal RLY6_CTRL output by the control module. The control end of the switch device Q12 is also connected to the power supply end VCC through the pull-up resistor R118. The control end of the switch device Q12 is also grounded through the pull-down resistor R123. The pull-up resistor R118 and the pull-down resistor R123 can form a voltage divider circuit for reducing the control voltage of the switch device Q12. Q12 can be a voltage-controlled switch device; the first end of the switch device Q12 is connected to the control end of the PEN controllable switch component, and is used to control the PEN controllable switch component to be opened or closed through the signal RLY6_CTR; the first end of the switch device Q12 is also connected to the power supply end RLY_PWR, and the second end of the switch device Q12 is grounded.

[0074] Specifically, Figure 5As shown, the control end of the switch device Q12 is connected to the control module through the current limiting resistor R120, and is used to receive the switch control signal RLY6_CTRL, wherein the current limiting resistor R120 can prevent the transient current in the circuit from impacting the switch device, causing damage or instability to the device, thereby ensuring the safe transmission of the switch control signal. At the same time, the control end of the switch device Q12 is also connected to the power supply terminal VCC through the pull-up resistor R118, and is grounded through the pull-down resistor R123. The two resistors together constitute a voltage divider circuit, which can adjust the control voltage of the switch device Q12 and enhance the stability and adaptability of the circuit. In addition, the pull-down resistor R123 can also make the switch device work in the cut-off state when the charging is stopped, so that the switch device Q12 can be free from the influence of external interference or noise and be in an uncertain switching state.

[0075] In this embodiment, the working principle of the switch control module is as follows: the control module sends a switch control signal in response to a charging instruction, and sets the switch control signal RLY6_CTRL to a valid state (i.e., a high level state). At this time, the switch device Q12 is turned on, the first end and the second end of the switch device Q12 are connected, and the signal RLY6_CTR is pulled down to a low level, a voltage difference is formed across the coil of the PEN controllable switch component, and the PEN controllable switch component is closed; when a leakage, grounding or other fault occurs, the control module sends a switch control signal, and sets the switch control signal RLY6_CTRL to an invalid state (i.e., a low level state). At this time, the switch device Q12 is turned off, the first end of the switch device Q12 is connected to the power supply RLY_PWR, the signal RLY6_CTR becomes a high level, there is no voltage difference across the coil of the PEN controllable switch component, and the PEN controllable switch component is disconnected. Furthermore, in the uncharged state, by grounding the control end of the switch device Q12 through a resistor, the switch device Q12 can be kept in the cut-off state, so that the PEN controllable switch component is continuously disconnected. At this time, even if the neutral line of the power grid system is broken, the electrical equipment can be protected because the PEN line is in the disconnected state; when starting charging, the power signal of the power supply VCC can reach the control end of the switch device Q12 before the switch control signal, so that the switch device Q12 can be controlled to turn on first, so as to control the PEN controllable switch component to close at the first time of power-on, so that the electrical equipment can achieve grounding protection.

[0076] The above embodiment can achieve precise control of the PEN controllable switch component by setting a switch device and a resistor network in the switch control module, and the above circuit can achieve leakage protection for the electrical equipment in both power-off and charging states, thereby improving the safety and reliability of the electrical equipment.

[0077] In one embodiment, Figure 5As shown, the switch control module further includes a second protection unit and / or a third filtering unit. The second protection unit can be arranged between the control terminal of the PEN controllable switch component and the power supply terminal RLY_PWR, such as a surge absorber ZNR (Zinc-Oxide Nonlinear Resistor) D20; the third filtering unit can be arranged between the control terminal and the ground terminal of the switch device Q12, such as a filtering capacitor C105.

[0078] Specifically, Figure 5 As shown, the second protection unit can adopt a surge absorber ZNRD20, and is arranged between the control end of the PEN controllable switch component and the power supply end RLY_PWR, for absorbing the reverse current at the moment of power failure to prevent the reverse current from damaging the PEN controllable switch component and the switch device Q12, thereby protecting the safe operation of the circuit. Further, the third filtering unit can adopt a filtering capacitor C105, and is arranged between the control end and the ground end of the switch device Q12, for filtering out high-frequency noise and interference in the input signal, so as to ensure that the switch device Q12 receives a clear and stable control signal, thereby improving the accuracy and response speed of the control of the PEN controllable switch component.

[0079] The above embodiment can enhance the reliability of the switch control module and improve the signal quality of the switch control signal by providing the second protection unit and the third filtering unit in the switch control module.

[0080] In one embodiment, the electrical device further comprises a voltage detection module connected to the control module, wherein the voltage detection module can be used to detect the voltage at the input terminal of the grid side, such as the voltage between the phase line and the neutral line of the grid side, and output a voltage detection signal. In addition, the electrical device is also connected to a second leakage current detection module, wherein the second leakage current detection module can be used to detect a second leakage current at the input terminal of the grid side 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. Further, the control module can receive a first leakage current detection signal detected on the PEN line and a second leakage current detection signal detected by a second leakage current detection module arranged at the input end of the grid side, and generate a PME alarm signal based on the first leakage current detection signal and the second leakage current detection signal to prompt the user to stay away from the fault area or stop charging.

[0081] In the above embodiment, 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 the first leakage current detection signal is greater than or equal to the preset first current threshold, and the second leakage current detection module does not detect the second leakage current detection signal. Second, the control module generates a PME alarm signal when it detects that the first leakage current detection signal is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the voltage detection signal is greater than the preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal. Third, the control module generates a PME alarm signal when it detects that the voltage detection signal is greater than the preset second voltage threshold for a duration that exceeds the response duration corresponding to the second voltage threshold.

[0082] It can be understood that the thresholds under the above-mentioned various alarm scenarios can be set according to actual conditions. 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 be set to a voltage deviation of more than ±10% exceeding 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 is not specifically limited here.

[0083] Specifically, the voltage detection module can detect the voltage between the phase line and the neutral line on the grid side in real time, and output the voltage detection signal to the control module, so as to monitor the stability of the grid side input voltage in real time through the control module. Furthermore, the second leakage current detection module can detect the second leakage current at the input end of the grid side, and output the detected second leakage current detection signal to the control module, so as to monitor whether there is excessive leakage current on the grid side through the control module, wherein the setting position of the second leakage current detection module and the leakage current detection principle can refer to the above RCD, which will not be repeated here. Based on this, when the control module performs grounding or leakage fault detection, it can not only receive the first leakage current detection signal from the PEN line, but also make a comprehensive judgment in combination with the voltage detection signal and the second leakage current detection signal.

[0084] In various scenarios, the control module can generate a PME alarm signal to respond to different safety risks. For example, when the first leakage current detection signal is detected to increase abnormally and the second leakage current detection module does not detect the second leakage current detection signal, it means that a leakage fault may have occurred in the front stage of the second leakage current detection module, such as a neutral line remote disconnection fault. At this time, a PME alarm signal can be generated to remind the user to stay away from the possible leakage area; in addition, when the first leakage current detection signal is detected to be within a certain range, and the input voltage is detected to have an abnormal change, and the second leakage current detection module still does not detect the second leakage current detection signal, an alarm can also be triggered to remind the user to stay away from the leakage area; in addition, when the voltage continues to be abnormal for more than a set period of time, it can also be regarded as a potential danger, and a PME alarm signal can also be issued to ensure the user's electricity safety.

[0085] The above embodiment can realize comprehensive monitoring and protection of the voltage and leakage current of the grid input terminal by integrating the voltage detection module and the second leakage current detection module in the electrical equipment to work in coordination with the control module. Compared with the traditional method of detecting leakage faults in the circuit through RCD or input voltage in the prior art, this embodiment can significantly improve the leakage protection capability and fault warning level of the electrical equipment through multi-module collaboration and multi-condition judgment mechanism, 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.

[0086] In one embodiment, the control device is also communicatively connected to an information indication module of the electrical equipment, wherein the control device is further configured to output a PME alarm signal to the information indication module so that the information indication module indicates the PME alarm signal.

[0087] Specifically, when the control device detects abnormal conditions such as leakage and overvoltage, it can send out a PME alarm signal and output the PME alarm signal to the information indication module of the electrical equipment. After receiving the PME alarm signal, the information indication module can clearly indicate the current safety hazards to the user through sound and light, display screen or other visual and auditory methods. This instant and intuitive indication method can effectively improve the user's perception of the safety status of electrical equipment, so that the user can respond quickly and take necessary measures, such as cutting off the power supply and staying away from the fault area, so as to avoid potential safety risks.

[0088] The above embodiment can realize rapid transmission and effective indication of PME alarm signals by connecting the control device and the information indication module for communication and controlling the control device and the information indication module to work in coordination, thereby enhancing the safety protection capability of the electrical equipment.

[0089] In one embodiment, the electrical device further comprises a voltage detection module connected to the control module, wherein the voltage detection module can be used to detect the voltage at the input terminal of the grid side, such as the voltage between the phase line and the neutral line of the grid side, and output a voltage detection signal. In addition, the electrical device is also connected to a second leakage current detection module, wherein the second leakage current detection module can be used to detect a second leakage current at the input terminal of the grid side 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. Further, the control module can receive a first leakage current detection signal detected on the PEN line and a second leakage current detection signal detected by a second leakage current detection module arranged at the input end of the grid side, and output a switch control signal based on the first leakage current detection signal and the second leakage current detection signal to control the PEN controllable switch component to disconnect, thereby avoiding the risk of electric shock to the user.

[0090] In the above embodiment, the control module can output a switch control signal in at least one of the following scenarios to control the disconnection of the PEN controllable switch component: First, when the control module detects that the first leakage current detection signal is greater than or equal to the preset first current threshold, and the second leakage current detection module does not detect the second leakage current detection signal, the control module outputs a switch control signal to control the disconnection of the PEN controllable switch component. Second, when the control module detects that the first leakage current detection signal is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the voltage detection signal is greater than the preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, the control module outputs a switch control signal to control the disconnection of the PEN controllable switch component. It can be understood that under the above-mentioned various conditions, other rules such as response time and hazard level can also be used to further improve the safety protection level of electrical equipment.

[0091] It can be understood that the thresholds under the above-mentioned various alarm scenarios can be set according to actual conditions. For example, a current threshold can be set to 25mA, the second current threshold and the third current threshold can be set to 18mA and 25mA respectively, and the first voltage threshold can be set to a voltage deviation of more than ±10% exceeding the input voltage (i.e., the voltage between the phase line and the neutral line), etc. This embodiment is not specifically limited here.

[0092] Specifically, the voltage detection module can detect the voltage between the phase line and the neutral line on the grid side in real time, and output the voltage detection signal to the control module, so as to monitor the stability of the grid side input voltage in real time through the control module. Furthermore, the second leakage current detection module can detect the second leakage current at the input end of the grid side, and output the detected second leakage current detection signal to the control module, so as to monitor whether there is excessive leakage current on the grid side through the control module, wherein the setting position of the second leakage current detection module and the leakage current detection principle can refer to the above RCD, which will not be repeated here. Based on this, when the control module performs grounding or leakage fault detection, it can not only receive the first leakage current detection signal from the PEN line, but also make a comprehensive judgment in combination with the voltage detection signal and the second leakage current detection signal.

[0093] In various scenarios, the control module can output a switch control signal to control the PEN controllable switch component to disconnect, thereby cutting off the current path, thereby preventing the user from touching the PEN line and causing the risk of electric shock. For example, when it is detected that the first leakage current detection signal increases abnormally and the second leakage current detection module does not detect the second leakage current detection signal, it means that a leakage fault may have occurred in the front stage of the second leakage current detection module, such as a disconnection at the far end of the neutral line. At this time, the control module can disconnect the PEN controllable switch component to avoid the risk of electric shock to the user; in addition, when it is detected that the first leakage current detection signal is within a certain range, and the input voltage is detected to have an abnormal change, and the second leakage current detection module still does not detect the second leakage current detection signal, it can also trigger the PEN controllable switch component to disconnect, thereby avoiding the risk of electric shock to the user.

[0094] The above embodiment can realize comprehensive monitoring and protection of the voltage and leakage current of the input terminal of the grid side by integrating the voltage detection module and the second leakage current detection module in the electrical equipment to work in coordination with the control module. Compared with the traditional method of detecting leakage faults in the circuit through RCD or input voltage in the prior art, this embodiment can significantly improve the leakage protection capability of the electrical equipment through multi-module coordination and multi-condition judgment mechanism, 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.

[0095] In one embodiment, the control device is also connected to the control end of the power switch of the electrical equipment, wherein the control module can be used to output a power switch control signal to control the power switch to disconnect, thereby suspending charging, after outputting a switch control signal to control the PEN controllable switch component to disconnect.

[0096] Specifically, the control device can also be connected to the control end of the power switch in the electrical device. In this embodiment, when the control module detects that the electrical device has a potential safety risk (such as leakage risk), it can output a switch control signal to control the PEN controllable switch component to disconnect, and then output a power switch control signal to control the power switch to disconnect. In the above manner, not only can the current path be cut off, but the charging process of the electrical device can also be suspended, thereby preventing further safety problems that may be caused by continuous charging.

[0097] The above embodiment can respond immediately and provide comprehensive protection when a safety incident occurs by controlling the power switch. It can not only effectively isolate risk sources such as leakage, but also ensure the safety and controllability of the charging process, thereby providing dual protection for the stable operation of electrical equipment and the safety of users.

[0098] In one embodiment, the voltage detection signal is detected by: in a three-phase system, the phase voltages of the three phase lines are detected respectively and their vector sums are calculated to obtain a voltage detection signal; in a single-phase system, the voltage between the phase line and the neutral line is detected as a voltage detection signal.

[0099] Specifically, in response to 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 respectively detect the phase voltages of the three phase lines and calculate their vector sum to obtain a voltage detection signal, wherein the vector sum of the phase voltages can be calculated in the control module or in the voltage detection module, and this embodiment is not specifically limited here. The vector sum of the phase voltages characterizes the imbalance of the power system and also characterizes the degree of danger once the neutral line is broken. The above detection method fully considers the complexity of the three-phase system 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 phase line and the neutral line as a voltage detection signal, which simplifies the voltage detection process and improves the voltage detection efficiency.

[0100] The above embodiments not only meet the application requirements of electrical equipment in different power systems by providing a variety of voltage detection methods, but also ensure the accuracy and reliability of voltage detection, thereby providing more possibilities for the flexible application of electrical equipment in different scenarios.

[0101] In one embodiment, a control method for an electrical device is provided. The method can be applied to the electrical device described in any of the above embodiments. Figure 6As shown, the method includes the following steps: when in the charging state, receiving the first leakage current detection signal collected on the PEN line in real time, wherein a PEN controllable switch component is provided on the PEN line, and when in the charging state, the PEN controllable switch component is in a closed state; when it is detected 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 connected to the electrical equipment does not detect the second leakage current detection signal, outputting a PME alarm signal, and / or outputting a switch control signal to control the PEN controllable switch component to disconnect.

[0102] Specifically, the flow chart of the control method of the electrical equipment provided in this embodiment is as follows: Figure 6 As shown. In this embodiment, when the electrical device is in a charging state, the first leakage current detection signal collected by the first leakage current detection module set on the PEN line can be received in real time. At this time, the electrical device is charging, the PEN controllable switch component is in a closed state, and the PEN line allows current to pass. Further, when the control module detects that the first leakage current detection signal reaches or exceeds the preset safety threshold (i.e., the first current threshold), and at the same time confirms that the second leakage current detection module (equivalent to RCD) connected to the electrical device does not detect the second leakage current detection signal, it means that a leakage fault may have occurred in the front stage of the second leakage current detection module, such as a neutral line remote disconnection fault. At this time, the control device can respond immediately and output a PME alarm signal to alert the user, and / or output a switch control signal to control the PEN controllable switch component to quickly disconnect, thereby cutting off the current path, thereby avoiding the risk of electric shock to the user.

[0103] It should be noted that, for the circuit configuration mode and technical effects inside the electrical device in this embodiment, reference can be made to any of the above-mentioned embodiments of the electrical device, and no further description is given here. In addition, the first current threshold can be set according to actual conditions, for example, the first current threshold can be set to 25mA, 30mA, etc., and this embodiment does not make any specific limitation here.

[0104] The above embodiment makes a comprehensive judgment on the leakage situation by real-time monitoring of the first leakage current detection signal on the PEN line and the second leakage current detection signal output by the second leakage current detection module set at the input end of the grid side, so as to achieve rapid response and automatic protection to the leakage situation during the charging process of the electrical equipment. The control method of the above electrical equipment can protect the electrical equipment in the PME system through leakage current detection on the PEN line and switch control of the PEN controllable switch component when a leakage fault occurs. In particular, when a fault such as a disconnection of the remote N line occurs, the residual current action protector set at the input end of the grid side cannot detect the residual current, so there is a considerable safety hazard. In contrast, the control method of the above electrical equipment can detect the excessive leakage current on the PEN line through the first leakage current detection module, so that the connection of the PEN controllable switch component can be cut off in time, so that the PE line of the electrical equipment is not energized, thereby protecting the user from the risk of electric shock, and improving the safety and reliability of the electrical equipment.

[0105] In one embodiment, Figure 7 As shown, the control method of the above-mentioned electrical equipment may also include the following steps: when it is detected that the first leakage current detection signal is greater than or equal to the preset second current threshold and less than or equal to the preset third current threshold, and the voltage detection signal at the grid-side input terminal is greater than the preset first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, output a PME alarm signal, and / or output a switch control signal to control the PEN controllable switch component to disconnect.

[0106] Specifically, during the charging process of the electrical device, in addition to the aforementioned detection of the first leakage current detection signal on the PEN line, the voltage at the input end of the grid side can also be monitored in real time. Specifically, when the control module detects that the first leakage current detection signal is between the preset second current threshold and the third current threshold (i.e., a moderate leakage risk), and at the same time confirms that the voltage detection signal at the input end of the grid side exceeds the preset first voltage threshold (indicating that the grid may have voltage anomalies or instability), and the second leakage current detection module still does not detect the second leakage current, the system will comprehensively evaluate these factors and determine that the electrical equipment currently has a high leakage risk. At this time, the control module can output a PME alarm signal to alert the user, and / or output a switch control signal to control the PEN controllable switch component to disconnect, thereby quickly cutting off the current path that may cause danger.

[0107] It can be understood that the thresholds in the above alarm scenarios can be set according to actual conditions. For example, the second current threshold and the third current threshold can be set to 18mA and 25mA respectively, and the first voltage threshold can be set to a voltage deviation of more than ±10% exceeding the input voltage (i.e., the voltage between the phase line and the neutral line), etc. This embodiment is not specifically limited here.

[0108] The above embodiment can significantly improve the leakage protection capability of electrical equipment in complex environments by introducing multiple parameters to judge the leakage situation. The above method can effectively avoid false operation or leakage caused by misjudgment of a single factor, thereby providing more reliable safety protection in complex situations such as abnormal grid voltage. At the same time, through real-time alarm and automatic disconnection of PEN controllable switch components, the fault response time is further shortened, the risk of electric shock to users is reduced, and the overall safety performance and user experience of electrical equipment are improved.

[0109] In one embodiment, the first current threshold includes at least one first current threshold corresponding to a danger level, and the first current threshold of each danger level is preset with a corresponding response time. In this scenario, the control method for controlling the PEN controllable switch component to disconnect by the first leakage current detection signal and the second leakage current detection signal to perform safety protection can be implemented in the following manner: when it is detected that the first leakage current detection signal is greater than or equal to the first current threshold corresponding to any danger level for a duration exceeding the response time corresponding to the danger level, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and a switch control signal is output to control the PEN controllable switch component to disconnect.

[0110] Specifically, the first current threshold can be specifically refined into thresholds corresponding to multiple danger levels, wherein each level can set a corresponding response time. For example, the danger level can be divided into the first danger level, the second danger level and the third danger level, and the first current thresholds corresponding to the three danger levels are 25mA, 60mA and 150mA, respectively, and the response times corresponding to the three danger levels are 300ms, 150ms and 40ms, respectively. Among them, the higher the danger level, the higher the first current threshold and the shorter the response time.

[0111] When the electrical device is in charging or working state, the control module can continuously monitor the first leakage current detection signal on the PEN line and compare the output of the second leakage current detection module at the same time. When it is detected that the first leakage current detection signal continues to exceed the first current threshold corresponding to a certain danger level for a time longer than the preset response time of the level, and the second leakage current detection module has not detected the second leakage current signal during this period, the control module can determine that the electrical device currently has a leakage risk corresponding to the danger level. Subsequently, the control module can automatically output a PME alarm signal to alert the user, and output a switch control signal to quickly control the PEN controllable switch component to disconnect, thereby cutting off the potential leakage path and avoiding the occurrence of safety accidents.

[0112] The above embodiment can make the leakage protection control of electrical equipment more accurate and efficient by introducing multiple danger levels and response times. The above method can not only effectively distinguish different degrees of leakage risks, but also take corresponding protective measures according to the actual situation of the risk, which not only ensures safety but also avoids unnecessary equipment shutdown or malfunction. At the same time, through real-time alarm and fast disconnection control, the fault response time can be shortened, the risk of electric shock to users can be reduced, and a strong guarantee can be provided for the long-term stable operation of electrical equipment.

[0113] In one embodiment, the control method for controlling the disconnection of the PEN controllable switch component by the first leakage current detection signal and the second leakage current detection signal for safety protection can also be implemented in the following way: when it is detected that the first leakage current detection signal is greater than or equal to the first current threshold corresponding to a higher danger level than the current danger level, and the duration exceeds the response duration corresponding to the higher danger level, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and a switch control signal is output to control the disconnection of the PEN controllable switch component, wherein the response duration corresponding to the higher danger level is shorter than the response duration corresponding to the current danger level.

[0114] Specifically, when the control module detects that the first leakage current detection signal continues to increase and reaches or exceeds the first current threshold corresponding to a level higher than the current danger level, and the duration of this high current state exceeds the preset, relatively shorter response time of the higher danger level, and at the same time confirms that the second leakage current detection module has not detected any second leakage current detection signal during this period, the control module can determine that there is a sharply increased leakage risk. At this time, the control module can immediately output a PME alarm signal to warn the user to stay away from the electric shock area, and at the same time output a switch control signal to control the PEN controllable switch component to disconnect, thereby quickly cutting off the potential leakage path to prevent the situation from further deteriorating.

[0115] The above embodiment can further improve the sensitivity and timeliness of electrical safety protection by introducing a rapid response mechanism for higher risk levels. Through the above method, electrical equipment can respond quickly when the risk of leakage rises sharply, thereby effectively avoiding safety accidents caused by response delays. At the same time, by shortening the response time of high risk levels, the time interval from fault detection to power cut-off can be further shortened, thereby providing a more solid guarantee for the safety of users and equipment.

[0116] In one embodiment, a control method for controlling the disconnection of a PEN controllable switch component by a first leakage current detection signal and a voltage detection signal at a grid-side input terminal for safety protection can be implemented in the following manner: when it is detected that the first leakage current detection signal is greater than or equal to the second current threshold and less than or equal to the third current threshold for a duration exceeding a response duration corresponding to the first voltage threshold, and the voltage detection signal is greater than the first voltage threshold for a duration exceeding a response duration corresponding to the first voltage threshold, and the second leakage current detection module does not detect the second leakage current detection signal, a PME alarm signal is output, and a switch control signal is output to control the disconnection of the PEN controllable switch component.

[0117] Specifically, during the charging or operation of the electrical equipment, the control module can monitor in real time the first leakage current detection signal on the PEN line and the voltage detection signal output by the voltage detection module set at the input end of the grid side. When the control module detects that the first leakage current detection signal is between the second current threshold and the third current threshold, and the duration of this state exceeds the preset response time corresponding to the first voltage threshold; at the same time, the voltage detection signal at the input end of the grid side also exceeds the first voltage threshold, and the duration of this overvoltage state also exceeds the response time corresponding to the first voltage threshold, under this dual condition, if the second leakage current detection module still does not detect any second leakage current signal, the control module can determine that the electrical equipment currently has a high safety risk. At this time, the control module can immediately output a PME alarm signal to warn the user, and at the same time output a switch control signal to control the PEN controllable switch component to quickly disconnect, thereby cutting off the potential leakage or overvoltage path to ensure the safety of the electrical equipment and the user.

[0118] It can be understood that the thresholds in the above alarm scenarios can be set according to actual conditions. For example, the second current threshold and the third current threshold can be set to 18mA and 25mA respectively, the first voltage threshold can be set to a voltage deviation of more than ±10% exceeding 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 is not specifically limited here.

[0119] The above embodiment can achieve more comprehensive and accurate safety protection for electrical equipment by comprehensively considering the dual detection signals of leakage current and voltage and their duration. This method not only improves the system's ability to identify complex electrical faults, but also increases the flexibility and accuracy of control by setting the response time. When the risk of leakage or overvoltage occurs, the system can respond quickly, thereby effectively avoiding the occurrence of electrical accidents, providing reliable protection for the stable operation of electrical equipment and the safe use of users.

[0120] In one embodiment, Figure 8As shown, the control method of the above-mentioned electrical equipment may also include the following steps: when it is detected that the voltage detection signal at the input terminal of the grid side is greater than the preset second voltage threshold and the duration exceeds the response time corresponding to the second voltage threshold, a PME alarm signal is output.

[0121] Specifically, Figure 8 As shown in the flowchart. In this embodiment, the control module can continuously monitor the voltage detection signal at the input end of the grid side, and set a preset second voltage threshold and a corresponding response time. When the control module detects that the voltage detection signal continues to exceed this threshold, and the time for which this overvoltage state is maintained exceeds the preset response time, the control module can determine that the grid side input voltage is abnormal, which may endanger the normal operation of the electrical equipment. At this time, the control module can output a PME alarm signal to remind the user to pay attention to the abnormal voltage so that the relevant personnel can take corresponding treatment measures.

[0122] It can be understood that the thresholds in the above alarm scenarios can be set according to actual conditions. For example, the second voltage thresholds can be set to a voltage deviation of more than ±10% exceeding the input voltage (i.e., the voltage between the phase line and the neutral line), and the response time can be set to 5s, etc. This embodiment is not specifically limited here.

[0123] The above embodiment can improve the response accuracy and response accuracy of electrical equipment to abnormal voltage on the grid side by introducing the duration of the voltage detection signal as a judgment basis. Compared with directly cutting off the power supply, the method of outputting the PME alarm signal is more flexible and can be restored, which can effectively remind users to pay attention to voltage problems and avoid equipment shutdown or service interruption caused by misoperation.

[0124] In one embodiment, the voltage detection signal can be detected in the following manner: in a three-phase system, the phase voltages of the three phase lines are detected respectively 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 detected as the voltage detection signal.

[0125] Specifically, this embodiment provides a specific detection method for voltage detection signals in different power systems. In a three-phase system, the control module can detect the voltages between the three phase lines (such as phase A, phase B, and phase C) and the neutral line respectively through the voltage detection module, and then calculate the vector sum of the three voltages as a voltage detection signal. The vector sum of the phase voltages characterizes the imbalance of the power system and can be used for subsequent safety control or status monitoring. In a single-phase system, the detection method is relatively simple and direct. The control module only needs to detect the voltage between the phase line and the neutral line, and process this voltage as a voltage detection signal.

[0126] The above embodiments can achieve accurate acquisition of voltage detection signals in three-phase and single-phase systems by providing targeted voltage detection methods. This method of calculating the phase voltage vector sum not only improves the accuracy of voltage detection in three-phase systems, but also helps to discover potential phase imbalance problems. In single-phase systems, the method of directly detecting the phase line and neutral line voltages is simpler and more efficient, and can quickly respond to voltage changes.

[0127] In one embodiment, after controlling the PEN controllable switch component to be disconnected, the control method of the electrical device may further include the following steps: outputting a power switch control signal to control the power switch to be disconnected to suspend charging.

[0128] Specifically, when the control module detects leakage anomalies or grounding anomalies, in addition to controlling the PEN controllable switch component to disconnect to prevent leakage, it can also output a power switch control signal according to the current state of the electrical equipment to control the power switch of the electrical equipment to disconnect, thereby suspending the charging process of the electrical equipment, thereby preventing safety problems that may be caused by continuing charging under abnormal conditions.

[0129] The above embodiment can avoid possible equipment damage or safety risks caused by continuous charging by quickly cutting off the PEN controllable switch component and suspending charging in time when an abnormality is detected in the power grid or the electrical equipment itself. This dual protection mechanism can significantly improve the safety and reliability of electrical equipment.

[0130] In one embodiment, before starting charging, the control method of the electrical device may further include the following steps: in response to a charging instruction, outputting a switch control signal and a power switch control signal to control both the PEN controllable switch component and the power switch to be closed to start charging.

[0131] Specifically, when the user issues a charging instruction or the electrical device automatically issues a charging instruction, the control module can respond to the charging instruction and output a switch control signal, which can be output to the control end of the PEN controllable switch component through the switch control module to drive the PEN controllable switch component to close, thereby establishing a safe connection between the electrical device and the protective ground wire. Then, the control module can output a power switch control signal, which will be output to the control end of the power switch to drive the power switch to complete the closing action, thereby establishing a safe connection between the electrical device and each phase line on the grid side. After the PEN controllable switch component and the power switch are closed successively, the charging circuit of the electrical device is connected, and the charging process is officially started.

[0132] The above embodiment can ensure the safety of the electrical device during the startup and charging phase by controlling the PEN controllable switch component and the power switch to close successively, so that the electrical device can start charging smoothly.

[0133] It should be noted that the information (including but not limited to device information, user information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. In addition, the numbers corresponding to the various steps in the above embodiments only serve as identification and are not used as a limitation on the order in which the steps are executed. The order in which the steps are executed in each embodiment can be set according to actual conditions.

[0134] The embodiment of the present application also provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a bus, a processor, a memory and a communication interface, and can also include an input and output interface and a display device. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store location information. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in each method embodiment are implemented.

[0135] Those skilled in the art will appreciate that the structure of the above-mentioned computer device is only a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0136] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and stores a computer program thereon. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0137] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0138] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0139] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0140] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An electrical device, characterized in that: The electrical equipment comprises: A PEN controllable switch component, connected to the PEN line, for disconnecting or connecting the PEN line; A first leakage current detection module, connected in series with the PEN controllable switch component on the PEN line, for detecting a first leakage current on the PEN line when the PEN controllable switch component is closed, and outputting a first leakage current detection signal; a signal processing module, connected to the output end of the first leakage current detection module, and configured to process the first leakage current detection signal; a control module connected to the output end of the signal processing module, configured 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 is connected to the output end of the control module and the control end of the PEN controllable switch component, and is used to control the PEN controllable switch component to be closed or opened based on the switch control signal.

2. The electrical device 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 end of the current transformer is connected to the first end of the PEN line, the second input end of the current transformer is connected to the second end of the PEN line, the first output end of the current transformer is connected to the reference voltage source, and the second output end of the current transformer is connected to the input end of the signal processing module as the output end of the first leakage current detection module.

3. The electrical device according to claim 2, characterized in that: 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 a ground terminal.

4. The electrical device according to claim 2, characterized in that: The signal processing module includes an operational amplifier and a plurality of 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 device according to claim 4, characterized in that: The signal processing module also includes a matching resistor, wherein: The matching resistor is connected in series between the output end of the first leakage current detection module and the negative input end of the operational amplifier, and the resistance of the matching resistor is greater than the internal resistance of the current transformer.

6. The electrical device 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 arranged between the positive input terminal of the operational amplifier and the negative input terminal of the operational amplifier, and / or, the first protection unit is arranged between the output terminal of the operational amplifier and the power supply terminal, and / or, the first protection unit is arranged between the output terminal of the operational amplifier and the ground terminal; and / or, The second filtering unit is arranged between the negative input terminal of the operational amplifier and the output terminal of the operational amplifier, and / or the second filtering unit is arranged between the output terminal of the operational amplifier and a ground terminal.

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

8. A control method for an electrical device, characterized in that: The method is applied to the electrical device according to any one of claims 1 to 7, and the method comprises: When in the charging state, receiving in real time a first leakage current detection signal collected on a PEN line, wherein a PEN controllable switch component is provided on the PEN line, and in the charging state, the PEN controllable switch component is in a closed state; When it is detected 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 connected to the electrical equipment does not detect the second leakage current detection signal, a PME alarm signal is output, and / or a switch control signal is output to control the PEN controllable switch component to disconnect.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to claim 8 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to claim 8 is implemented.

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