Detection device for PE line in power supply network, conductive charging system and electric vehicle

Abstract

The present invention discloses a detection device for a PE line in a power supply network, a conductive charging system and an electric vehicle, comprising a live line, a neutral line and a PE line in the detection device, a controller, a leakage current simulation device and a leakage current detection device. The input end of the leakage current simulation device is connected to the controller, the first output end of the leakage current simulation device is connected to the live line or the neutral line, the second output end of the leakage current simulation device is connected to the PE line, the live line and the neutral line are connected to or pass through the leakage current detection device, or the leakage current detection device is connected in series in the circuit of the leakage current simulation device, and the output end of the leakage current detection device is connected to the controller; the controller controls the leakage current simulation device to generate a leakage current, and the leakage current detection device generates a signal when the leakage current is detected. When the generated signal value is within the signal value range preset by the controller, the PE line is valid, thereby ensuring the personal safety of users when using electrical equipment, conductive charging systems and electric vehicles for charging by detecting whether the PE line is valid.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a detection device for a PE line in a power supply network, a conductive charging system and an electric vehicle. Background Art

[0002] With the development of power supply technology and the popularization of electrical equipment, the safety of electricity use has become a common concern of users. When the electrical equipment that users often use is accidentally energized, the electrical equipment will usually be connected to the ground wire in the power supply network, that is, the PE (protective conductor) line, thereby forming a short-circuit current. The electrical equipment is discharged to the ground, and the human body will not touch the energized electrical equipment and cause the risk of electric shock. It can be seen that the PE line in the power supply network is very important to protect the safety of users' electricity use.

[0003] However, due to the different power supply modes of power supply networks in different regions, there is no known way to use a detection device suitable for PE line detection of power supply networks with different power supply modes to ensure the safety of users' electricity use. At the same time, since electricity use is continuous, the ability to automatically and continuously detect whether the PE line is effective has become the focus of protecting users' electricity safety. However, there is no known way to reliably and automatically and continuously detect whether the PE line of the power supply network is effective. Therefore, how to provide a solution to the above-mentioned technical problems is a problem that technicians in this field currently need to solve urgently.

[0004] With the popularity of electric vehicles, the problem of electricity safety in conductive charging systems and electric vehicle users has become increasingly prominent. Charging safety accidents caused by conductive charging systems and electric vehicle charging occur from time to time. So far, there is no known conductive charging system and electric vehicle that can effectively detect whether the PE line at the power supply network end of different power supply methods is valid to ensure the safety of users. At the same time, since charging is continuous, the ability to automatically and continuously detect whether the PE line is valid has become the focus of protecting the safety of users' electricity use. However, there is no known conductive charging system and electric vehicle that can meet the requirements of automatically and reliably detecting the presence or absence of the PE line in the power supply network. Therefore, how to provide a conductive charging system and electric vehicle that solves the above-mentioned technical problems is currently an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a detection device for a PE line in a power supply network, a conductive charging system and an electric vehicle, which can automatically and continuously detect whether the PE line in the power supply network is effective to ensure the safety of users.

[0006] In order to solve the above technical problems, the present invention provides a detection device for a PE line in a power supply network, the detection device comprising a live line, a neutral line and a PE line in the detection device, a controller, a leakage current simulation device and a leakage current detection device;

[0007] The live wire, the neutral wire, and the PE wire are used to connect to a power supply network and electrical equipment.

[0008] Preferably, the input end of the leakage current simulation device is connected to the controller, the first output end of the leakage current simulation device is connected to the live wire or the neutral wire, and the second output end of the leakage current simulation device is connected to the PE wire;

[0009] The live wire and the neutral wire are connected to the leakage current detection device, or the live wire and the neutral wire pass through the leakage current detection device, and the output end of the leakage current detection device is connected to the controller; the controller is used to control the leakage current simulation device to generate a simulated leakage current, and the leakage current detection device is used to generate a signal when the simulated leakage current is detected, when the generated signal value is within the range of the signal value preset by the controller, it is determined that the PE line is valid, and when the generated signal value is not within the range of the signal value preset by the controller, it is determined that the PE line is invalid.

[0010] Preferably, the input end of the leakage current simulation device is connected to the controller, the first output end of the leakage current simulation device is connected to the live wire or the neutral wire, and the second output end of the leakage current simulation device is connected to the PE wire;

[0011] The leakage current detection device is connected in series in the circuit of the leakage current simulation device, and the output signal of the leakage current detection device is fed back to the controller; the controller is used to control the leakage current simulation device to generate a simulated leakage current, and the leakage current detection device is used to generate a signal when the simulated leakage current is detected, and when the generated signal value is within the range of the signal value preset by the controller, it is determined that the PE line is valid, and when the generated signal value is not within the range of the signal value preset by the controller, it is determined that the PE line is invalid.

[0012] Preferably, the detection device further comprises a live wire controllable switch driving circuit and a live wire controllable switch, wherein:

[0013] The controller is connected to the live wire controllable switch driving circuit, the driving end of the live wire controllable switch driving circuit is connected to the control end of the live wire controllable switch, the first end of the live wire controllable switch is connected to the input end of the live wire, and the second end of the live wire controllable switch is connected to the output end of the live wire; the controller is used to control the disconnection or conduction of the live wire controllable switch through the live wire controllable switch driving circuit, so as to cut off or connect the live wire accordingly.

[0014] Further, the live wire controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the live wire controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the live wire controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the live wire controllable switch; or the live wire controllable switch is a relay, the relay coil serves as the control end of the live wire controllable switch, the first end of the relay switch contact serves as the first end of the live wire controllable switch, and the second end of the relay switch contact serves as the second end of the live wire controllable switch.

[0015] Preferably, the detection device further comprises a neutral line controllable switch driving circuit and a neutral line controllable switch, wherein:

[0016] The controller is connected to the neutral line controllable switch driving circuit, the driving end of the neutral line controllable switch driving circuit is connected to the control end of the neutral line controllable switch, the first end of the neutral line controllable switch is connected to the input end of the neutral line, and the second end of the neutral line controllable switch is connected to the output end of the neutral line; the controller controls the neutral line controllable switch to be disconnected or turned on through the neutral line controllable switch driving circuit, so as to cut off or connect the neutral line accordingly.

[0017] Further, the neutral line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the neutral line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the neutral line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the neutral line controllable switch; or the neutral line controllable switch is a relay, the relay coil serves as the control end of the neutral line controllable switch, the first end of the relay switch contact serves as the first end of the neutral line controllable switch, and the second end of the relay switch contact serves as the second end of the neutral line controllable switch.

[0018] Preferably, the detection device further comprises a PE line controllable switch driving circuit and a PE line controllable switch, wherein:

[0019] The controller is connected to the PE line controllable switch driving circuit, the driving end of the PE line controllable switch driving circuit is connected to the control end of the PE line controllable switch, the first end of the PE line controllable switch is connected to the input end of the PE line, and the second end of the PE line controllable switch is connected to the output end of the PE line; the controller controls the PE line controllable switch to disconnect or connect through the PE line controllable switch driving circuit, so as to cut off or connect the PE line accordingly.

[0020] Further, the PE line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the PE line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the PE line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the PE line controllable switch; or the PE line controllable switch is a relay, the relay coil serves as the control end of the PE line controllable switch, the first end of the relay switch contact serves as the first end of the PE line controllable switch, and the second end of the relay switch contact serves as the second end of the PE line controllable switch.

[0021] Preferably, the leakage current detection device comprises current sensors connected in series to the live wire and the neutral wire respectively.

[0022] Preferably, the leakage current detection device is a leakage current sensor, and both the neutral line and the live line pass through the leakage current sensor.

[0023] Preferably, the PE line does not pass through the leakage current sensor.

[0024] Preferably, the PE line passes through the leakage current sensor, and a direction in which the PE line passes through the leakage current sensor is opposite to a direction in which the live line and the neutral line pass through the leakage current sensor.

[0025] Preferably, the detection device also includes a leakage current detection device self-test circuit, a first end of the leakage current detection device self-test circuit is connected to the self-test end of the controller, a second end of the leakage current detection device self-test circuit is connected to the self-test function end of the leakage current detection device, and the controller is used to send a self-test signal to the leakage current detection device through the leakage current detection device self-test circuit. When the signal fed back by the leakage current detection device received by the controller is within a preset feedback signal range, the leakage current detection device is normal; otherwise, the leakage current detection device is faulty.

[0026] Preferably, the self-detection circuit of the leakage current detection device includes a resistor and a self-detection coil, the first end of the resistor serves as the first end of the self-detection circuit of the leakage current detection device, the second end of the resistor is connected to the first end of the self-detection coil, and the second end of the self-detection coil serves as the second end of the self-detection circuit of the leakage current detection device.

[0027] Preferably, the detection device further comprises an operational amplifier circuit, wherein:

[0028] The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device, the output end of the operational amplifier circuit is connected to the controller, and the operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device.

[0029] Preferably, the detection device further comprises a filtering circuit, wherein:

[0030] The input end of the filter circuit is connected to the output end of the leakage current detection device, the output end of the filter circuit is connected to the controller, and the filter circuit is used to filter the signal generated by the leakage current detection device.

[0031] Preferably, the detection device further comprises an operational amplifier circuit and a filter circuit, wherein:

[0032] The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device, the output end of the operational amplifier circuit is connected to the input end of the filter circuit, the output end of the filter circuit is connected to the controller, the operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device, and the filter circuit is used to filter the signal generated by the leakage current detection device.

[0033] Preferably, the leakage current simulation device comprises a photocoupler, wherein the photocoupler comprises a light emitting diode and a phototransistor, and the photocoupler is used to cut off or connect the path of the leakage current.

[0034] Preferably, the leakage current simulation device further includes a DC power supply, a first resistor, a second resistor, and a first controllable switch, wherein:

[0035] The first end of the first resistor is connected to the output end of the DC power supply, the second end of the first resistor is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the first end of the first controllable switch, the second end of the first controllable switch is electrically grounded, the control end of the first controllable switch serves as the input end of the leakage current simulation device, the collector of the phototransistor is connected to the first end of the second resistor, the emitter of the phototransistor serves as the second output end of the leakage current simulation device, and the second end of the second resistor serves as the first output end of the leakage current simulation device.

[0036] Preferably, the leakage current simulation device comprises a magnetic coupler, and the magnetic coupler is used to cut off or connect the path of the leakage current.

[0037] Preferably, the leakage current simulation device further includes a triode, a third resistor, and a fourth resistor, wherein:

[0038] The input end of the magnetic coupler serves as the input end of the leakage current simulation device, the output end of the magnetic coupler is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the base of the transistor, the collector of the transistor is connected to the first end of the third resistor, the emitter of the transistor serves as the second output end of the leakage current simulation device, and the second end of the third resistor serves as the first output end of the leakage current simulation device.

[0039] Preferably, the leakage current simulation device comprises a relay, wherein the relay comprises a drive coil and a load switch, and the relay is used to cut off or connect a path of the leakage current.

[0040] Preferably, the leakage current simulation device further includes a DC power supply, a fifth resistor, a sixth resistor, and a second controllable switch, wherein:

[0041] The DC power supply is connected to the first end of the drive coil, the two ends of the drive coil are connected to the first end of the second controllable switch, the second end of the second controllable switch is electrically grounded, the control end of the second controllable switch is connected to the first end of the sixth resistor, the second end of the sixth resistor serves as the input end of the leakage current simulation device, the first end of the load switch is connected to the first end of the fifth resistor, the second end of the load switch serves as the second output end of the leakage current simulation device, and the second end of the fifth resistor serves as the first output end of the leakage current simulation device.

[0042] Preferably, the power supply mode of the power supply network includes a single-phase power supply mode or a multi-phase power supply mode of any one of five types: IT, TT, TN-C, TN-S and TN-CS.

[0043] In order to solve the above technical problems, the present invention also provides a conductive charging system, which is used to connect a power supply network and an electric vehicle. The conductive charging system includes a detection device for a PE line in any of the above power supply networks.

[0044] Preferably, the conductive charging system further comprises a power supply plug connected to the power supply network.

[0045] Preferably, the conductive charging system further comprises a vehicle plug or a vehicle socket connected to the electric vehicle.

[0046] Furthermore, the conductive charging system also includes a power supply plug connected to the power supply network.

[0047] Preferably, the conductive charging system further comprises a fault prompting device, and when the PE line in the power supply network is invalid, the fault prompting device prompts the user of the invalid state of the PE line in the power supply network.

[0048] Preferably, the fault prompting device is specifically a visual prompting device.

[0049] Furthermore, the visual prompt device is specifically a light emitting diode or a display screen.

[0050] Preferably, the fault prompt device is specifically a sound prompt device.

[0051] Furthermore, the sound prompting device prompts through buzzing sound, beeping warning sound or voice.

[0052] Preferably, when the PE line in the power supply network is invalid, the conductive charging system cuts off the connection between the electric vehicle and the power supply network.

[0053] Furthermore, the conductive charging system also includes a working switch for receiving a working instruction from a user, so that the conductive charging system connects the electric vehicle with the power supply network according to the working instruction.

[0054] In order to solve the above technical problems, the present invention also provides an electric vehicle, which includes any one of the above conductive charging systems.

[0055] The present invention provides a detection device for a PE line in a power supply network, a conductive charging system and an electric vehicle, including a live wire, a neutral wire and a PE wire in the detection device, a controller, a leakage current simulation device and a leakage current detection device. The input end of the leakage current simulation device is connected to the controller, the first output end of the leakage current simulation device is connected to the live wire or the neutral wire, the second output end of the leakage current simulation device is connected to the PE line, the live wire and the neutral wire are connected or pass through the leakage current detection device, or the leakage current detection device is connected in series in the circuit of the leakage current simulation device, and the output end of the leakage current detection device is connected to the controller. The present application controls the leakage current simulation device to generate a leakage current through the controller, and the leakage current detection device generates a signal when the leakage current is detected. When the generated signal value is within the preset signal value range of the controller, the PE line is determined to be valid, otherwise, the PE line is determined to be invalid. It can be seen that the present application can automatically and continuously detect whether the PE line is valid to ensure the personal safety of users when using electrical equipment, conductive charging systems and electric vehicles for charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] FIG1( a ) is a schematic diagram of the structure of a detection device for a PE line in a power supply network provided by the present invention;

[0058] FIG1( b ) is a schematic structural diagram of another device for detecting a PE line in a power supply network provided by the present invention;

[0059] Figure 2 A connection method of a leakage current sensor is used in the leakage current detection device shown in FIG. 1(a) or FIG. 1(b);

[0060] Figure 3 Another application is to use a leakage current sensor connection mode in the leakage current detection device shown in FIG. 1( a ) or FIG. 1( b );

[0061] Figure 4 A schematic diagram of the structure of the leakage current simulation device shown in the first application FIG. 1(a) or FIG. 1(b);

[0062] Figure 5 A schematic diagram of the structure of the leakage current simulation device shown in FIG. 1( a ) or FIG. 1( b ) of the second application;

[0063] Figure 6 A schematic diagram of the structure of the leakage current simulation device shown in FIG. 1( a ) or FIG. 1( b ) for the third application;

[0064] Figure 7 A schematic diagram of the structure of the first electric vehicle charging method provided by the present invention;

[0065] Figure 8 A schematic diagram of the structure of a second electric vehicle charging device provided by the present invention;

[0066] Fig. 9 This is a schematic diagram of the structure of the third electric vehicle charging system provided by the present invention. DETAILED DESCRIPTION

[0067] With the development of power supply technology and the popularization of electrical equipment, the safety of electricity use has become a common concern of users. When the electrical equipment that users often use is accidentally energized, the electrical equipment will usually be connected to the ground wire in the power supply network, that is, the PE (protective conductor) line, thereby forming a short-circuit current. The electrical equipment is discharged to the ground, and the human body will not touch the energized electrical equipment and cause the risk of electric shock. It can be seen that the PE line in the power supply network is very important to protect the safety of users' electricity use.

[0068] However, due to the different power supply modes of power supply networks in different regions, there is no known way to use a detection device suitable for PE line detection of power supply networks with different power supply modes to ensure the safety of users' electricity use. At the same time, since electricity use is continuous, the ability to automatically and continuously detect the effectiveness of the PE line has become the focus of protecting users' electricity safety. However, there is no known way to reliably and automatically and continuously detect whether the PE line of the power supply network is effective. Therefore, how to provide a solution to the above-mentioned technical problems is a problem that technicians in this field currently need to solve urgently.

[0069] With the popularity of electric vehicles, the problem of power safety of conductive charging systems and electric vehicle users has become increasingly prominent. Charging safety accidents caused by conductive charging systems and electric vehicle charging occur from time to time. So far, there is no known conductive charging system and electric vehicle that can effectively detect whether the PE line at the power supply network end of different power supply modes is effective to ensure the safety of users. At the same time, since charging is continuous, it has become the focus of protecting the safety of users' power use to automatically and continuously detect whether the PE line is effective. However, there is no known conductive charging system and electric vehicle that can meet the requirements of automatically and reliably and continuously detecting whether the PE line of the power supply network is effective. Therefore, how to provide a conductive charging system and electric vehicle that solve the above technical problems is currently urgently needed to be solved by technicians in this field. The core of the present invention is to provide a detection device for PE line in a power supply network, a conductive charging system and an electric vehicle, which can detect whether the PE line in the power supply network is effective. Moreover, in a preferred embodiment of a conductive charging system and an electric vehicle, the connection between the electric vehicle and the power supply network can be cut off.

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] The present invention provides a detection device for a PE line in a power supply network, the detection device comprising a live line, a neutral line and a PE line in the detection device, a controller, a leakage current simulation device and a leakage current detection device;

[0072] The live wire, neutral wire, and PE wire are used to connect to the power supply network and electrical equipment.

[0073] Specifically, the detection device provided in the present application includes a controller, a leakage current simulation device and a leakage current detection device, and also includes a live wire, a neutral wire and a PE wire in the detection device. The power supply network is connected to the electrical equipment through the above-mentioned live wire, neutral wire and PE wire.

[0074] Please refer to Figure 1(a) or Figure 1(b), Figure 1(a) is a structural schematic diagram of a detection device for PE line in a power supply network provided by the present invention, and Figure 1(b) is a structural schematic diagram of another detection device for PE line in a power supply network provided by the present invention.

[0075] As a preferred embodiment, the input end of the leakage current simulation device 2 is connected to the controller 1, the first output end of the leakage current simulation device 2 is connected to the live wire or the neutral wire, and the second output end of the leakage current simulation device 2 is connected to the PE wire;

[0076] The live wire and the neutral wire are connected to the leakage current detection device 3, or the live wire and the neutral wire pass through the leakage current detection device 3, and the output end of the leakage current detection device 3 is connected to the controller 1; the controller 1 is used to control the leakage current simulation device 2 to generate a simulated leakage current, and the leakage current detection device 3 is used to generate a signal when the simulated leakage current is detected. When the generated signal value is within the range of the signal value preset by the controller 1, the PE line is determined to be valid, and when the generated signal value is not within the range of the signal value preset by the controller 1, the PE line is determined to be invalid.

[0077] It should be noted that the presets in this application are set and only need to be set once. Unless they need to be modified according to actual conditions, there is no need to reset them.

[0078] Specifically, the working principle of the detection device is: the controller 1 controls the leakage current simulation device 2 to work, so that the leakage current simulation device 2 generates leakage current. The leakage current simulation device 2 can be set to generate, but not limited to, a current of 0-1A, a preferred choice is to generate a current of 0-50mA, and a more preferred choice is 0-30mA. As for the specific current setting of the leakage current simulation device 2, this application does not make any special restrictions here.

[0079] When the leakage current simulation device 2 generates a simulated leakage current, and the leakage current detection device 3 detects the generated leakage current, a signal is output to the controller 1. When the generated signal value is within the range of the signal value set by the controller 1, the PE line is determined to be valid, and when the generated signal value is not within the range of the signal value set by the controller 1, the PE line is determined to be invalid.

[0080] The controller 1 here can be but not limited to an MCU (Microcontroller Unit) composed of one or more integrated devices, and the integrated device is used to realize the control function. The MCU can select a 4-bit microprocessor or an 8-bit microprocessor or a 16-bit microprocessor or a 32-bit microprocessor or a 64-bit microprocessor, and reasonably select the microprocessor according to its application field. As for the specific selection of MCU, this application does not make any special restrictions here, and it depends on the actual situation. The program in the MCU is stored in FLASH or EERPOM or FROM to ensure that the control logic is still preserved when the MCU is powered off. Of course, this application can also use other types of controllers as the controller 1 in this application, and this application does not make any special restrictions here, and it depends on the actual situation.

[0081] As a preferred embodiment, the input end of the leakage current simulation device 2 is connected to the controller 1, the first output end of the leakage current simulation device 2 is connected to the live wire or the neutral wire, and the second output end of the leakage current simulation device 2 is connected to the PE wire;

[0082] The leakage current detection device 3 is connected in series in the circuit of the leakage current simulation device 2, and the output signal of the leakage current detection device 3 is fed back to the controller 1; the controller 1 is used to control the leakage current simulation device 2 to generate a simulated leakage current, and the leakage current detection device 3 is used to generate a signal when the simulated leakage current is detected. When the generated signal value is within the range of the signal value preset by the controller 1, the PE line is determined to be valid, and when the generated signal value is not within the range of the signal value preset by the controller 1, the PE line is determined to be invalid.

[0083] Specifically, the leakage current detection device 3 in the present application can be connected in series in the circuit of the leakage current simulation device 2. For example, the leakage current detection device 3 uses a resistor to allow the generated leakage current to flow through the resistor. The controller 1 will sample the two ends of the resistor to obtain a voltage value, that is, the output signal of the leakage current detection device 3, thereby calculating the current value flowing through the resistor to achieve the purpose of detecting the leakage current.

[0084] As a preferred embodiment, the detection device further includes a live wire controllable switch driving circuit and a live wire controllable switch, wherein:

[0085] The controller 1 is connected to the fire wire controllable switch driving circuit, the driving end of the fire wire controllable switch driving circuit is connected to the control end of the fire wire controllable switch, the first end of the fire wire controllable switch is connected to the input end of the fire wire, and the second end of the fire wire controllable switch is connected to the output end of the fire wire; the controller 1 is used to control the disconnection or conduction of the fire wire controllable switch through the fire wire controllable switch driving circuit, so as to cut off or connect the fire wire accordingly.

[0086] Specifically, the detection device provided by the present application also includes a fire line controllable switch driving circuit and a fire line controllable switch. The controller 1 controls the fire line controllable switch connected to the fire line through the fire line controllable switch driving circuit to connect the power supply network to the power-consuming equipment. Considering the personal safety of the user, when the PE line is invalid, the controller 1 can control the fire line controllable switch to disconnect through the fire line controllable switch driving circuit, thereby cutting off the fire line and protecting the personal safety of the user.

[0087] As a preferred embodiment, the live wire controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the live wire controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the live wire controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the live wire controllable switch; or the live wire controllable switch is a relay, the relay coil serves as the control end of the live wire controllable switch, the first end of the relay switch contact serves as the first end of the live wire controllable switch, and the second end of the relay switch contact serves as the second end of the live wire controllable switch.

[0088] Specifically, the live wire controllable switch in the present application can adopt but is not limited to bidirectional thyristors. Bidirectional thyristors are a type of silicon-controlled rectifier device that can realize contactless control of alternating current in the circuit and control large current with small current. It has the advantages of no sparks, fast action, long life, high reliability and simplified circuit structure.

[0089] In addition, the live wire controllable switch in the present application can also use a relay, and the controller 1 drives the relay coil to close and connect. Of course, the present application can also use other switches as the live wire controllable switch, and the present application does not make any special restrictions here.

[0090] As a preferred embodiment, the detection device further includes a neutral line controllable switch driving circuit and a neutral line controllable switch, wherein:

[0091] The controller 1 is connected to the neutral line controllable switch driving circuit, the driving end of the neutral line controllable switch driving circuit is connected to the control end of the neutral line controllable switch, the first end of the neutral line controllable switch is connected to the input end of the neutral line, and the second end of the neutral line controllable switch is connected to the output end of the neutral line; the controller 1 controls the neutral line controllable switch to be disconnected or turned on through the neutral line controllable switch driving circuit, so as to cut off or connect the neutral line accordingly.

[0092] Specifically, in order to further improve the safety of electrical equipment, the detection device provided in the present application also includes a neutral line controllable switch driving circuit and a neutral line controllable switch. Similarly, the controller 1 controls the neutral line controllable switch connected to the neutral line through the neutral line controllable switch driving circuit; when the PE line is invalid, the controller 1 can control the neutral line controllable switch to be disconnected through the neutral line controllable switch driving circuit, thereby cutting off the neutral line.

[0093] As a preferred embodiment, the neutral line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the neutral line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the neutral line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the neutral line controllable switch; or the neutral line controllable switch is a relay, the relay coil serves as the control end of the neutral line controllable switch, the first end of the relay switch contact serves as the first end of the neutral line controllable switch, and the second end of the relay switch contact serves as the second end of the neutral line controllable switch.

[0094] Similarly, the neutral line controllable switch in the present application can be used but not limited to bidirectional thyristors or relays. Of course, the present application can also use other switches as the neutral line controllable switch, and the present application does not make any special restrictions here.

[0095] As a preferred embodiment, the detection device further includes a PE line controllable switch driving circuit and a PE line controllable switch, wherein:

[0096] The controller 1 is connected to the PE line controllable switch driving circuit, the driving end of the PE line controllable switch driving circuit is connected to the control end of the PE line controllable switch, the first end of the PE line controllable switch is connected to the input end of the PE line, and the second end of the PE line controllable switch is connected to the output end of the PE line; the controller 1 controls the PE line controllable switch to disconnect or conduct through the PE line controllable switch driving circuit, so as to cut off or connect the PE line accordingly.

[0097] Similarly, in order to further improve the safety of electrical equipment, the detection device provided in the present application also includes a PE line controllable switch driving circuit and a PE line controllable switch. Similarly, the controller 1 controls the PE line controllable switch connected to the PE line through the PE line controllable switch driving circuit; when the PE line is invalid, the controller 1 can control the PE line controllable switch to disconnect through the PE line controllable switch driving circuit, thereby cutting off the PE line.

[0098] As a preferred embodiment, the PE line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the PE line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the PE line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the PE line controllable switch; or the PE line controllable switch is a relay, the relay coil serves as the control end of the PE line controllable switch, the first end of the relay switch contact serves as the first end of the PE line controllable switch, and the second end of the relay switch contact serves as the second end of the PE line controllable switch.

[0099] Similarly, the PE line controllable switch in the present application can be used but not limited to bidirectional thyristors or relays. Of course, the present application can also use other switches as the PE line controllable switch, and the present application does not make any special restrictions here.

[0100] In addition, the detection device of the present application may simultaneously include any two combinations of a live wire controllable switch, a neutral wire controllable switch and a PE wire controllable switch and a drive circuit. At this time, the controllable switches of any two combinations may share a drive circuit; or the two controllable switches may each use their own drive circuit. The present application does not make any special limitations on this.

[0101] In addition, the detection device of the present application may simultaneously include a live wire controllable switch, a neutral wire controllable switch, a PE wire controllable switch and a drive circuit. In this case, the three controllable switches may share one drive circuit; any two controllable switches may share one drive circuit, and the remaining controllable switch may use a separate drive circuit; or all three controllable switches may use a separate drive circuit. The present application does not make any special limitations on this.

[0102] As a preferred embodiment, the leakage current detection device 3 includes current sensors connected in series on the live wire and the neutral wire respectively.

[0103] Specifically, the present application can use a current sensor to detect leakage current. A current sensor is connected in series to each of the live wire and the neutral wire. When the leakage current simulation device 2 generates leakage current, the current value measured by the current sensor on the live wire is not equal to the current value measured by the current sensor on the neutral wire. The controller 1 determines whether the current value difference between the live wire and the neutral wire is within the set signal value range, so as to determine whether the PE wire is valid accordingly.

[0104] As a preferred embodiment, the leakage current detection device 3 is a leakage current sensor, and both the neutral line and the live line pass through the leakage current sensor.

[0105] Specifically, the present application can use a leakage current sensor to detect leakage current, the live wire and the neutral wire pass through the leakage current sensor, when the leakage current simulation device 2 generates leakage current, the current vector sum flowing through the leakage current sensor is not zero, and the leakage current sensor outputs a signal to the controller 1, thereby realizing the detection of leakage current. As for the specific method of detecting leakage current, the present application does not make any special limitation here.

[0106] Please refer to Figure 2 , Figure 2 The present invention is a connection method of using a leakage current sensor in the leakage current detection device shown in FIG. 1( a ) or FIG. 1( b ).

[0107] As a preferred embodiment, the PE line does not pass through the leakage current sensor S.

[0108] Specifically, Figure 2 In the test, both the neutral line and the live line pass through the leakage current sensor S in the positive direction (directly), and the PE line does not pass through the leakage current sensor S.

[0109] Please refer to Figure 3, Figure 3 Another application is that the leakage current detection device shown in FIG. 1( a ) or FIG. 1( b ) uses a connection method of a leakage current sensor.

[0110] As a preferred embodiment, the PE line passes through the leakage current sensor S, and the direction in which the PE line passes through the leakage current sensor S is opposite to the direction in which the live line and the neutral line pass through the leakage current sensor S.

[0111] Specifically, Figure 3 In the test, the neutral line and the live line both pass through the leakage current sensor S in the forward direction, and the PE line passes through the leakage current sensor S in the reverse direction, which improves the accuracy and reliability of the detection.

[0112] As a preferred embodiment, the detection device also includes a leakage current detection device self-detection circuit, a first end of the leakage current detection device self-detection circuit is connected to the self-detection end of the controller 1, and a second end of the leakage current detection device self-detection circuit is connected to the self-detection function end of the leakage current detection device 3. The controller 1 is used to send a self-detection signal to the leakage current detection device 3 through the leakage current detection device self-detection circuit. When the feedback signal of the leakage current detection device 3 received by the controller 1 is within a preset feedback signal range, the leakage current detection device 3 is normal; otherwise, the leakage current detection device 3 is faulty.

[0113] Specifically, considering that the leakage current detection device 3 may fail, the present application also includes a leakage current detection device self-test circuit. The controller 1 sends a self-test signal to the leakage current detection device 3 through the leakage current detection device self-test circuit. When the signal fed back by the leakage current detection device 3 received by the controller 1 is within the set feedback signal range, it indicates that the leakage current detection device 3 is normal. When the signal fed back by the leakage current detection device 3 received by the controller 1 is not within the set feedback signal range, it indicates that the leakage current detection device 3 is faulty.

[0114] As a preferred embodiment, the self-detection circuit of the leakage current detection device includes a resistor and a self-detection coil, the first end of the resistor serves as the first end of the self-detection circuit of the leakage current detection device, the second end of the resistor is connected to the first end of the self-detection coil, and the second end of the self-detection coil serves as the second end of the self-detection circuit of the leakage current detection device.

[0115] Specifically, the present application can use components such as resistors and self-test coils to form a self-test circuit of a leakage current detection device, and the controller 1 sends a signal to the self-test coil of the self-test circuit of the leakage current detection device through the resistor. Preferably, the signal here is a square wave. Of course, the present application can also use other components or a combination of components as the self-test circuit of the leakage current detection device, and the present application does not make any special restrictions here.

[0116] As a preferred embodiment, the detection device further includes an operational amplifier circuit, wherein:

[0117] The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device 3 , and the output end of the operational amplifier circuit is connected to the controller 1 . The operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device 3 .

[0118] Specifically, in order to facilitate detection of the signal generated by the leakage current detection device 3, the detection device further includes an operational amplifier circuit. The operational amplifier circuit amplifies the signal generated by the leakage current detection device 3, so that the weak detection signal is amplified to a certain value. The present application can set the amplification ratio according to actual conditions to improve the signal effect.

[0119] As a preferred embodiment, the detection device further includes a filtering circuit, wherein:

[0120] The input end of the filter circuit is connected to the output end of the leakage current detection device 3 , and the output end of the filter circuit is connected to the controller 1 . The filter circuit is used to filter the signal generated by the leakage current detection device 3 .

[0121] Specifically, in order to improve the signal effect generated by the leakage current detection device 3, the detection device also includes a filtering circuit, which will filter the signal generated by the leakage current detection device 3 to filter out interference signals, thereby obtaining a more accurate signal and preventing false detection.

[0122] As a preferred embodiment, the detection device further includes an operational amplifier circuit and a filter circuit, wherein:

[0123] The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device 3, the output end of the operational amplifier circuit is connected to the input end of the filter circuit, the output end of the filter circuit is connected to the controller 1, the operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device 3, and the filter circuit is used to filter the signal generated by the leakage current detection device 3.

[0124] Specifically, in order to make the signal generated by the leakage current detection device 3 more stable, the detection device can also include an operational amplifier circuit and a filter circuit at the same time. The operational amplifier circuit will proportionally amplify the signal generated by the leakage current detection device 3 to amplify the weaker detection signal to a certain value; the filter circuit will filter the amplified signal to filter out interference signals.

[0125] As a preferred embodiment, the leakage current simulation device 2 includes a photocoupler, wherein the photocoupler includes a light emitting diode and a phototransistor, and the photocoupler is used to cut off or connect the path of the leakage current.

[0126] Specifically, the process of the leakage current simulation device 2 generating leakage current includes: the controller 1 generates a light signal by controlling the light-emitting diode in the photoelectric coupler to turn on, that is, the photoelectric coupler is in a working state, and the photosensitive transistor in the photoelectric coupler converts the light signal into an electrical signal to generate leakage current.

[0127] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the leakage current simulation device shown in the first application Figure 1(a) or Figure 1(b).

[0128] As a preferred embodiment, the leakage current simulation device 2 further includes a DC power supply, a first resistor R1, a second resistor R2, and a first controllable switch Q1, wherein:

[0129] The first end of the first resistor R1 is connected to the output end of the DC power supply, the second end of the first resistor R1 is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the first end of the first controllable switch Q1, the second end of the first controllable switch Q1 is connected to the electrical ground, the control end of the first controllable switch Q1 serves as the input end of the leakage current simulation device 2, the collector of the phototransistor is connected to the first end of the second resistor R2, the emitter of the phototransistor serves as the second output end of the leakage current simulation device 2, and the second end of the second resistor R2 serves as the first output end of the leakage current simulation device 2.

[0130] Specifically, the first end of the first resistor R1 is connected to the output end of the DC power supply, the second end of the first resistor R1 is connected to the anode of the light-emitting diode in the photocoupler U1, the cathode of the light-emitting diode is connected to the first end of the first controllable switch Q1, the second end of the first controllable switch Q1 is connected to the electrical ground, the control end of the first controllable switch Q1 serves as the input end of the leakage current simulation device 2, the collector of the phototransistor in the photocoupler U1 is connected to the first end of the second resistor R2, the emitter of the phototransistor serves as the second output end of the leakage current simulation device 2, and the second end of the second resistor R2 serves as the first output end of the leakage current simulation device 2. The first resistor R1 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel. The second resistor R2 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel.

[0131] It should be noted that the first resistor R1 and the second resistor R2 are not limited to the positions described in the structural diagram, and any position of a resistor that can produce the same function is within the scope described in this embodiment. For example: the first end of the first resistor R1 is connected to the cathode of the light-emitting diode, the second end of the first resistor R1 is connected to the first end of the first controllable switch Q1, the second end of the first controllable switch Q1 is electrically connected, the control end of the first controllable switch Q1 serves as the input end of the leakage current simulation device 2, the anode of the light-emitting diode is connected to the output end of the DC power supply, the first end of the second resistor R2 is connected to the emitter of the phototransistor, the second end of the second resistor R2 serves as the second output end of the leakage current simulation device 2, and the collector of the phototransistor serves as the first output end of the leakage current simulation device 2.

[0132] As a preferred embodiment, the leakage current simulation device 2 includes a magnetic coupler, wherein the magnetic coupler is used to cut off or connect the path of the leakage current.

[0133] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the leakage current simulation device shown in the second application FIG. 1( a ) or FIG. 1( b ).

[0134] As a preferred embodiment, the leakage current simulation device 2 further includes a third resistor R3, a fourth resistor R4, and a transistor Q2, wherein:

[0135] The input end of the magnetic coupler U2 serves as the input end of the leakage current simulation device 2, the output end of the magnetic coupler U2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the first end of the third resistor R3, the emitter of the transistor Q2 serves as the second output end of the leakage current simulation device 2, and the second end of the third resistor R3 serves as the first output end of the leakage current simulation device 2.

[0136] Specifically, the input end of the magnetic coupler U2 serves as the input end of the leakage current simulation device 2, the output end of the magnetic coupler U2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the first end of the third resistor R3, the emitter of the transistor Q2 serves as the second output end of the leakage current simulation device 2, and the second end of the third resistor R3 serves as the first output end of the leakage current simulation device 2. The third resistor R3 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel. The fourth resistor R4 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel.

[0137] The process of the leakage current simulation device 2 generating leakage current includes: the controller 1 provides a driving signal to the magnetic coupler U2, and the magnetic coupler U2 outputs a signal through internal coupling isolation to drive the transistor Q2 to turn on, thereby generating leakage current.

[0138] It should be noted that the third resistor R3 is not limited to the position described in the structural diagram, and any position of a resistor that can produce the same function is within the scope described in this embodiment. For example: the first end of the third resistor R3 is connected to the emitter of the transistor Q2, the second end of the third resistor R3 serves as the second output end of the leakage current simulation device 2, and the collector of the transistor Q2 serves as the first output end of the leakage current simulation device 2.

[0139] As a preferred embodiment, the leakage current simulation device 2 includes a relay, wherein the relay includes a drive coil and a load switch, and the relay is used to cut off or connect the path of the leakage current.

[0140] Specifically, the process of the leakage current simulation device 2 generating the leakage current includes: the controller 1 controls the driving coil to be energized, the load switch is closed, and the leakage current is generated.

[0141] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of the leakage current simulation device shown in FIG. 1( a ) or FIG. 1( b ) for the third application.

[0142] As a preferred embodiment, the leakage current simulation device 2 further includes a DC power supply, a fifth resistor R5, a sixth resistor R6, and a second controllable switch Q3, wherein:

[0143] The DC power supply is connected to the first end of the driving coil, the second end of the driving coil is connected to the first end of the second controllable switch Q3, the second end of the second controllable switch Q3 is connected to the electrical ground, the control end of the second controllable switch Q3 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 serves as the input end of the leakage current simulation device 2, the first end of the load switch is connected to the first end of the fifth resistor R5, the second end of the load switch serves as the second output end of the leakage current simulation device 2, and the second end of the fifth resistor R5 serves as the first output end of the leakage current simulation device 2.

[0144] Specifically, the DC power supply is connected to the first end of the driving coil in the relay U3, the second end of the driving coil is connected to the first end of the second controllable switch Q3, the second end of the second controllable switch Q3 is connected to the electrical ground, the control end of the second controllable switch Q3 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 serves as the input end of the leakage current simulation device 2, the first end of the load switch in the relay U3 is connected to the first end of the fifth resistor R5, the second end of the load switch serves as the second output end of the leakage current simulation device 2, and the second end of the fifth resistor R5 serves as the first output end of the leakage current simulation device 2. The fifth resistor R5 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel. The sixth resistor R6 can be replaced by a high-power resistor or a plurality of low-power resistors connected in series or in parallel.

[0145] It should be noted that the fifth resistor R5 is not limited to the position described in the structural diagram, and any position of a resistor that can produce the same function is within the scope described in this embodiment. For example: the first end of the fifth resistor R5 is connected to the second end of the load switch, the second end of the fifth resistor R5 serves as the second output end of the leakage current simulation device 2, and the first end of the load switch serves as the first output end of the leakage current simulation device 2.

[0146] As a preferred embodiment, the power supply mode of the power supply network includes a single-phase power supply mode or a multi-phase power supply mode of any one of five types: IT, TT, TN-C, TN-S and TN-CS.

[0147] Specifically, different countries or even different regions in the same country have different grounding methods for power supply systems due to differences in electricity usage and economic development. The current power supply systems include five types: IT, TT, TN-C, TN-S and TN-CS. The power supply method of the power supply network in this application can be a single-phase power supply method or a multi-phase power supply method in any type of power supply system to provide AC power to electrical equipment. Therefore, the detection device for PE lines in the power supply network provided in this application can be applicable to any region and any country, and has a wide range of applications.

[0148] The present invention also provides a conductive charging system, which is used to connect a power supply network and an electric vehicle. The conductive charging system includes a detection device for a PE line in any of the above-mentioned power supply networks.

[0149] Specifically, the conductive charging system connects a power supply network and an electric vehicle (ie, a motor vehicle that is driven in whole or in part by electric energy) to enable the power supply network to charge the electric vehicle.

[0150] For an introduction to the PE line detection device included in the conductive charging system provided in the present application, please refer to the above-mentioned PE line detection device embodiment, which will not be repeated in this application.

[0151] Please refer to Figure 7 , Figure 7 This is a schematic structural diagram of the first electric vehicle charging system provided by the present invention.

[0152] As a preferred embodiment, the conductive charging system further includes a power plug 11 connected to a power supply network.

[0153] Specifically, the present application can realize the connection between the electric vehicle and the power supply network through the power supply plug 11, so that the power supply network can charge the electric vehicle.

[0154] Please refer to Figure 8 , Figure 8 A schematic diagram of the structure of a second electric vehicle charging system provided by the present invention.

[0155] As a preferred embodiment, the conductive charging system further includes a vehicle plug 12 or a vehicle socket 12 connected to the electric vehicle.

[0156] Specifically, the conductive charging system can be integrated into the power supply device. The present application can realize the connection between the conductive charging system and the electric vehicle through the vehicle plug 12 or the vehicle socket 12, thereby realizing the power supply network charging the electric vehicle. When one side of the conductive charging system is the vehicle plug 12, the other side of the electric vehicle is the socket; when one side of the conductive charging system is the vehicle socket 12, the other side of the electric vehicle is the plug.

[0157] Please refer to Fig. 9 , Fig. 9 This is a schematic diagram of the structure of the third electric vehicle charging system provided by the present invention.

[0158] As a preferred embodiment, the conductive charging system further includes a power plug 11 connected to a power supply network.

[0159] Specifically, on the basis that the conductive charging system includes a vehicle plug 12 or a vehicle socket 12 connected to the electric vehicle, the conductive charging system further includes a power supply plug 11 connected to the power supply network.

[0160] As a preferred embodiment, the conductive charging system further includes a fault prompting device. When the PE line in the power supply network is invalid, the fault prompting device prompts the user of the invalid state of the PE line in the power supply network.

[0161] Specifically, the conductive charging system also includes a fault prompt device. When the PE line in the power supply network is invalid, the fault prompt device prompts the invalid state of the PE line in the power supply network, so as to remind the user that the PE line in the power supply network is invalid, thereby improving the safety of the conductive charging system.

[0162] As a preferred embodiment, the fault prompting device is specifically a visual prompting device.

[0163] Specifically, the fault prompt device in the present application can adopt a visual prompt device to allow the user to intuitively see the status of the PE line of the power supply network.

[0164] As a preferred embodiment, the visual prompting device is specifically a light emitting diode or a display screen.

[0165] Specifically, the visual prompt device here can use a light-emitting diode to remind the user of the status of the PE line in the power supply network by emitting light; it can also use a display screen to remind the user of the status of the PE line in the power supply network through screen display.

[0166] As a preferred embodiment, the fault prompt module is specifically a sound prompt device.

[0167] Specifically, the fault prompt device in the present application can adopt a sound prompt device, so that the user can directly hear the status of the PE line of the power supply network. As for the specific selection of the fault prompt device, the present application does not make any special restrictions here.

[0168] As a preferred embodiment, the sound prompting device provides a buzzer sound, a beeping warning sound, or a voice prompt.

[0169] Specifically, the sound prompt device here can prompt the user of the status of the PE line in the power supply network through but not limited to a buzzer sound or a beeping warning sound or a voice, and this application does not make any special limitation here.

[0170] As a preferred embodiment, when the PE line in the power supply network is invalid, the conductive charging system cuts off the connection between the electric vehicle and the power supply network.

[0171] Specifically, considering personal safety, when the PE line in the power supply network is invalid, the conductive charging system will cut off the connection between the electric vehicle and the power supply network, thereby stopping the charging of the electric vehicle.

[0172] As a preferred embodiment, the conductive charging system further includes a working switch for receiving a working instruction from a user, so that the conductive charging system connects the electric vehicle to the power supply network according to the working instruction.

[0173] Specifically, the conductive charging system in the present application also includes a working switch, and the user can also choose to close the working switch to connect the conductive charging system to the electric vehicle and the power supply network, so that the electric vehicle continues to charge.

[0174] The present invention also provides an electric vehicle, which comprises any one of the above-mentioned conductive charging systems.

[0175] For an introduction to the conductive charging system included in the electric vehicle provided in the present application, please refer to the above-mentioned embodiments of the conductive charging system, which will not be described in detail in the present application.

[0176] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0177] In this specification, the term "leakage current" refers to a current that causes the vector sum of a current flowing in a live line and a current flowing in a neutral line to be different from zero.

[0178] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for PE line in a power supply network, characterized in that: The detection device includes a live wire, a neutral wire and a PE wire in the detection device, a controller, a leakage current simulation device and a leakage current detection device; The live wire, the neutral wire, and the PE wire are used to connect to the power supply network and the electrical equipment; The input end of the leakage current simulation device is connected to the controller, the first output end of the leakage current simulation device is connected to the live wire or the neutral wire, and the second output end of the leakage current simulation device is connected to the PE wire; The live wire and the neutral wire are connected to the leakage current detection device, or the live wire and the neutral wire pass through the leakage current detection device, and the output end of the leakage current detection device is connected to the controller; or, The leakage current detection device is connected in series in the circuit of the leakage current simulation device, and the output signal of the leakage current detection device is fed back to the controller; The controller is used to control the leakage current simulation device to generate a simulated leakage current, and determine whether the PE line is valid according to whether the current value difference between the live line and the neutral line is within a set signal value range; the leakage current detection device is used to generate a signal when the simulated leakage current is detected, and when the generated signal value is within the signal value range preset by the controller, it is determined that the PE line is valid, and when the generated signal value is not within the signal value range preset by the controller, it is determined that the PE line is invalid; The leakage current simulation device includes a photocoupler, wherein the photocoupler includes a light emitting diode and a phototransistor, and the photocoupler is used to cut off or connect the path of the leakage current; The leakage current simulation device further includes a DC power supply, a first resistor, a second resistor, and a first controllable switch, wherein: The first end of the first resistor is connected to the output end of the DC power supply, the second end of the first resistor is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the first end of the first controllable switch, the second end of the first controllable switch is electrically grounded, the control end of the first controllable switch serves as the input end of the leakage current simulation device, the collector of the phototransistor is connected to the first end of the second resistor, the emitter of the phototransistor serves as the second output end of the leakage current simulation device, and the second end of the second resistor serves as the first output end of the leakage current simulation device; or, The leakage current simulation device includes a magnetic coupler, and the magnetic coupler is used to cut off or connect the path of the leakage current; The leakage current simulation device further includes a triode, a third resistor, and a fourth resistor, wherein: The input end of the magnetic coupler serves as the input end of the leakage current simulation device, the output end of the magnetic coupler is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the base of the transistor, the collector of the transistor is connected to the first end of the third resistor, the emitter of the transistor serves as the second output end of the leakage current simulation device, and the second end of the third resistor serves as the first output end of the leakage current simulation device; or, The leakage current simulation device comprises a relay, wherein the relay comprises a driving coil and a load switch, and the relay is used to cut off or connect a path of the leakage current; The leakage current simulation device further includes a DC power supply, a fifth resistor, a sixth resistor, and a second controllable switch, wherein: The DC power supply is connected to the first end of the drive coil, the second end of the drive coil is connected to the first end of the second controllable switch, the second end of the second controllable switch is electrically grounded, the control end of the second controllable switch is connected to the first end of the sixth resistor, the second end of the sixth resistor serves as the input end of the leakage current simulation device, the first end of the load switch is connected to the first end of the fifth resistor, the second end of the load switch serves as the second output end of the leakage current simulation device, and the second end of the fifth resistor serves as the first output end of the leakage current simulation device.

2. The detection device according to claim 1, characterized in that The detection device also includes a live wire controllable switch driving circuit and a live wire controllable switch, wherein: The controller is connected to the live wire controllable switch driving circuit, the driving end of the live wire controllable switch driving circuit is connected to the control end of the live wire controllable switch, the first end of the live wire controllable switch is connected to the input end of the live wire, and the second end of the live wire controllable switch is connected to the output end of the live wire; the controller is used to control the disconnection or conduction of the live wire controllable switch through the live wire controllable switch driving circuit, so as to cut off or connect the live wire accordingly.

3. The detection device according to claim 2, characterized in that: The live wire controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the live wire controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the live wire controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the live wire controllable switch; or the live wire controllable switch is a relay, the relay coil serves as the control end of the live wire controllable switch, the first end of the relay switch contact serves as the first end of the live wire controllable switch, and the second end of the relay switch contact serves as the second end of the live wire controllable switch.

4. The detection device according to claim 1, characterized in that: The detection device also includes a neutral line controllable switch driving circuit and a neutral line controllable switch, wherein: The controller is connected to the neutral line controllable switch driving circuit, the driving end of the neutral line controllable switch driving circuit is connected to the control end of the neutral line controllable switch, the first end of the neutral line controllable switch is connected to the input end of the neutral line, and the second end of the neutral line controllable switch is connected to the output end of the neutral line; the controller controls the neutral line controllable switch to be disconnected or turned on through the neutral line controllable switch driving circuit, so as to cut off or connect the neutral line accordingly.

5. The detection device according to claim 4, characterized in that: The neutral line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the neutral line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the neutral line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the neutral line controllable switch; or the neutral line controllable switch is a relay, the relay coil serves as the control end of the neutral line controllable switch, the first end of the relay switch contact serves as the first end of the neutral line controllable switch, and the second end of the relay switch contact serves as the second end of the neutral line controllable switch.

6. The detection device according to claim 1, characterized in that: The detection device also includes a PE line controllable switch driving circuit and a PE line controllable switch, wherein: The controller is connected to the PE line controllable switch driving circuit, the driving end of the PE line controllable switch driving circuit is connected to the control end of the PE line controllable switch, the first end of the PE line controllable switch is connected to the input end of the PE line, and the second end of the PE line controllable switch is connected to the output end of the PE line; the controller controls the PE line controllable switch to disconnect or connect through the PE line controllable switch driving circuit, so as to cut off or connect the PE line accordingly.

7. The detection device according to claim 6, characterized in that: The PE line controllable switch is a bidirectional thyristor, the control electrode of the bidirectional thyristor serves as the control end of the PE line controllable switch, the first main electrode of the bidirectional thyristor serves as the first end of the PE line controllable switch, and the second main electrode of the bidirectional thyristor serves as the second end of the PE line controllable switch; or the PE line controllable switch is a relay, the relay coil serves as the control end of the PE line controllable switch, the first end of the relay switch contact serves as the first end of the PE line controllable switch, and the second end of the relay switch contact serves as the second end of the PE line controllable switch.

8. The detection device according to any one of claims 1 to 7, characterized in that: The leakage current detection device includes current sensors connected in series to the live wire and the neutral wire respectively.

9. The detection device according to any one of claims 1 to 7, characterized in that: The leakage current detection device is a leakage current sensor, and both the neutral line and the live line pass through the leakage current sensor.

10. The detection device according to claim 9, characterized in that: The PE line does not pass through the leakage current sensor.

11. The detection device according to claim 9, characterized in that: The PE line passes through the leakage current sensor, and a direction in which the PE line passes through the leakage current sensor is opposite to a direction in which the live line and the neutral line pass through the leakage current sensor.

12. The detection device according to claim 1, characterized in that: The detection device also includes a leakage current detection device self-test circuit, a first end of the leakage current detection device self-test circuit is connected to the self-test end of the controller, a second end of the leakage current detection device self-test circuit is connected to the self-test function end of the leakage current detection device, and the controller is used to send a self-test signal to the leakage current detection device through the leakage current detection device self-test circuit. When the signal fed back by the leakage current detection device received by the controller is within a preset feedback signal range, the leakage current detection device is normal; otherwise, the leakage current detection device is faulty.

13. The detection device according to claim 12, characterized in that: The self-detection circuit of the leakage current detection device includes a resistor and a self-detection coil. The first end of the resistor serves as the first end of the self-detection circuit of the leakage current detection device. The second end of the resistor is connected to the first end of the self-detection coil. The second end of the self-detection coil serves as the second end of the self-detection circuit of the leakage current detection device.

14. The detection device according to claim 1, characterized in that: The detection device also includes an operational amplifier circuit, wherein: The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device, the output end of the operational amplifier circuit is connected to the controller, and the operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device.

15. The detection device according to claim 1, characterized in that: The detection device also includes a filter circuit, wherein: The input end of the filter circuit is connected to the output end of the leakage current detection device, the output end of the filter circuit is connected to the controller, and the filter circuit is used to filter the signal generated by the leakage current detection device.

16. The detection device according to claim 1, characterized in that: The detection device also includes an operational amplifier circuit and a filter circuit, wherein: The input end of the operational amplifier circuit is connected to the output end of the leakage current detection device, the output end of the operational amplifier circuit is connected to the input end of the filter circuit, the output end of the filter circuit is connected to the controller, the operational amplifier circuit is used to proportionally amplify the signal generated by the leakage current detection device, and the filter circuit is used to filter the signal generated by the leakage current detection device.

17. The detection device according to claim 1, characterized in that: The power supply mode of the power supply network includes any single-phase power supply mode or multi-phase power supply mode of five types: IT, TT, TN-C, TN-S and TN-CS.

18. A conductive charging system, characterized in that: The conductive charging system is used to connect a power supply network and an electric vehicle, and the conductive charging system comprises a detection device for a PE line in a power supply network as claimed in any one of claims 1 to 17.

19. The conductive charging system of claim 18, wherein: The conductive charging system further comprises a power supply plug connected to the power supply network.

20. The conductive charging system of claim 18, wherein: The conductive charging system further comprises a vehicle plug or a vehicle socket connected to the electric vehicle.

21. The conductive charging system of claim 20, wherein: The conductive charging system further comprises a power supply plug connected to the power supply network.

22. The conductive charging system of claim 18, wherein: The conductive charging system also includes a fault prompting device. When the PE line in the power supply network is invalid, the fault prompting device prompts the user of the invalid state of the PE line in the power supply network.

23. The conductive charging system of claim 22, wherein: The fault prompting device is specifically a visual prompting device.

24. The conductive charging system of claim 23, wherein: The visual prompt device is specifically a light emitting diode or a display screen.

25. The conductive charging system of claim 22, wherein: The fault prompting device is specifically a sound prompting device.

26. The conductive charging system of claim 25, wherein: The sound prompting device prompts through buzzing sound, beeping warning sound or voice.

27. The conductive charging system of claim 18, wherein: When the PE line in the power supply network is invalid, the conductive charging system cuts off the connection between the electric vehicle and the power supply network.

28. The conductive charging system of claim 27, wherein: The conductive charging system also includes a working switch for receiving a working instruction from a user, so that the conductive charging system connects the electric vehicle with the power supply network according to the working instruction.

29. An electric vehicle, characterized in that: The electric vehicle comprises a conductive charging system as claimed in any one of claims 18 to 28.

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